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/*
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__ _____ _____ _____
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__| | __| | | | JSON for Modern C++
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| | |__ | | | | | | version 2.0.2
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|_____|_____|_____|_|___| https://github.com/nlohmann/json
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Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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Copyright (c) 2013-2016 Niels Lohmann <http://nlohmann.me>.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#ifndef NLOHMANN_JSON_HPP
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#define NLOHMANN_JSON_HPP
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#include <algorithm>
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#include <array>
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#include <cassert>
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#include <ciso646>
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#include <cmath>
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#include <cstddef>
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#include <cstdint>
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#include <cstdlib>
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#include <functional>
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#include <initializer_list>
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#include <iomanip>
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#include <iostream>
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#include <iterator>
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#include <limits>
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#include <locale>
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#include <map>
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#include <memory>
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#include <numeric>
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#include <sstream>
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#include <stdexcept>
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#include <string>
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#include <type_traits>
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#include <utility>
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#include <vector>
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// exclude unsupported compilers
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#if defined(__clang__)
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#define CLANG_VERSION (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__)
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#if CLANG_VERSION < 30400
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#error "unsupported Clang version - see https://github.com/nlohmann/json#supported-compilers"
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#endif
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#elif defined(__GNUC__)
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#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
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#if GCC_VERSION < 40900
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#error "unsupported GCC version - see https://github.com/nlohmann/json#supported-compilers"
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#endif
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#endif
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// disable float-equal warnings on GCC/clang
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#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wfloat-equal"
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#endif
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/*!
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@brief namespace for Niels Lohmann
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@see https://github.com/nlohmann
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@since version 1.0.0
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*/
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namespace nlohmann
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{
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/*!
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@brief unnamed namespace with internal helper functions
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@since version 1.0.0
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*/
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namespace
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{
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/*!
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@brief Helper to determine whether there's a key_type for T.
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Thus helper is used to tell associative containers apart from other containers
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such as sequence containers. For instance, `std::map` passes the test as it
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contains a `mapped_type`, whereas `std::vector` fails the test.
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@sa http://stackoverflow.com/a/7728728/266378
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@since version 1.0.0
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*/
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template<typename T>
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struct has_mapped_type
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{
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private:
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template<typename C> static char test(typename C::mapped_type*);
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template<typename C> static char (&test(...))[2];
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public:
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static constexpr bool value = sizeof(test<T>(0)) == 1;
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};
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/*!
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@brief helper class to create locales with decimal point
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This struct is used a default locale during the JSON serialization. JSON
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requires the decimal point to be `.`, so this function overloads the
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`do_decimal_point()` function to return `.`. This function is called by
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float-to-string conversions to retrieve the decimal separator between integer
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and fractional parts.
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@sa https://github.com/nlohmann/json/issues/51#issuecomment-86869315
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@since version 2.0.0
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*/
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struct DecimalSeparator : std::numpunct<char>
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{
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char do_decimal_point() const
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{
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return '.';
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}
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};
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}
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/*!
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@brief a class to store JSON values
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@tparam ObjectType type for JSON objects (`std::map` by default; will be used
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in @ref object_t)
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@tparam ArrayType type for JSON arrays (`std::vector` by default; will be used
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in @ref array_t)
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@tparam StringType type for JSON strings and object keys (`std::string` by
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default; will be used in @ref string_t)
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@tparam BooleanType type for JSON booleans (`bool` by default; will be used
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in @ref boolean_t)
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@tparam NumberIntegerType type for JSON integer numbers (`int64_t` by
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default; will be used in @ref number_integer_t)
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@tparam NumberUnsignedType type for JSON unsigned integer numbers (@c
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`uint64_t` by default; will be used in @ref number_unsigned_t)
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@tparam NumberFloatType type for JSON floating-point numbers (`double` by
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default; will be used in @ref number_float_t)
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@tparam AllocatorType type of the allocator to use (`std::allocator` by
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default)
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@requirement The class satisfies the following concept requirements:
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- Basic
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- [DefaultConstructible](http://en.cppreference.com/w/cpp/concept/DefaultConstructible):
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JSON values can be default constructed. The result will be a JSON null value.
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- [MoveConstructible](http://en.cppreference.com/w/cpp/concept/MoveConstructible):
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A JSON value can be constructed from an rvalue argument.
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- [CopyConstructible](http://en.cppreference.com/w/cpp/concept/CopyConstructible):
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A JSON value can be copy-constructed from an lvalue expression.
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- [MoveAssignable](http://en.cppreference.com/w/cpp/concept/MoveAssignable):
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A JSON value van be assigned from an rvalue argument.
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- [CopyAssignable](http://en.cppreference.com/w/cpp/concept/CopyAssignable):
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A JSON value can be copy-assigned from an lvalue expression.
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- [Destructible](http://en.cppreference.com/w/cpp/concept/Destructible):
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JSON values can be destructed.
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- Layout
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- [StandardLayoutType](http://en.cppreference.com/w/cpp/concept/StandardLayoutType):
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JSON values have
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[standard layout](http://en.cppreference.com/w/cpp/language/data_members#Standard_layout):
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All non-static data members are private and standard layout types, the class
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has no virtual functions or (virtual) base classes.
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- Library-wide
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- [EqualityComparable](http://en.cppreference.com/w/cpp/concept/EqualityComparable):
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JSON values can be compared with `==`, see @ref
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operator==(const_reference,const_reference).
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- [LessThanComparable](http://en.cppreference.com/w/cpp/concept/LessThanComparable):
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JSON values can be compared with `<`, see @ref
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operator<(const_reference,const_reference).
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- [Swappable](http://en.cppreference.com/w/cpp/concept/Swappable):
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Any JSON lvalue or rvalue of can be swapped with any lvalue or rvalue of
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other compatible types, using unqualified function call @ref swap().
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- [NullablePointer](http://en.cppreference.com/w/cpp/concept/NullablePointer):
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JSON values can be compared against `std::nullptr_t` objects which are used
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to model the `null` value.
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- Container
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- [Container](http://en.cppreference.com/w/cpp/concept/Container):
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JSON values can be used like STL containers and provide iterator access.
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- [ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer);
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JSON values can be used like STL containers and provide reverse iterator
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access.
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@invariant The member variables @a m_value and @a m_type have the following
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relationship:
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- If `m_type == value_t::object`, then `m_value.object != nullptr`.
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- If `m_type == value_t::array`, then `m_value.array != nullptr`.
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- If `m_type == value_t::string`, then `m_value.string != nullptr`.
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The invariants are checked by member function assert_invariant().
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@internal
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@note ObjectType trick from http://stackoverflow.com/a/9860911
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@endinternal
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@see [RFC 7159: The JavaScript Object Notation (JSON) Data Interchange
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Format](http://rfc7159.net/rfc7159)
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@since version 1.0.0
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@nosubgrouping
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*/
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template <
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template<typename U, typename V, typename... Args> class ObjectType = std::map,
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template<typename U, typename... Args> class ArrayType = std::vector,
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class StringType = std::string,
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class BooleanType = bool,
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class NumberIntegerType = std::int64_t,
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class NumberUnsignedType = std::uint64_t,
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class NumberFloatType = double,
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template<typename U> class AllocatorType = std::allocator
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>
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class basic_json
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{
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private:
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/// workaround type for MSVC
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using basic_json_t = basic_json<ObjectType, ArrayType, StringType,
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BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType,
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AllocatorType>;
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public:
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// forward declarations
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template<typename Base> class json_reverse_iterator;
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class json_pointer;
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/////////////////////
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// container types //
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/////////////////////
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/// @name container types
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/// The canonic container types to use @ref basic_json like any other STL
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/// container.
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/// @{
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/// the type of elements in a basic_json container
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using value_type = basic_json;
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/// the type of an element reference
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using reference = value_type&;
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/// the type of an element const reference
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using const_reference = const value_type&;
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/// a type to represent differences between iterators
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using difference_type = std::ptrdiff_t;
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/// a type to represent container sizes
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using size_type = std::size_t;
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/// the allocator type
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using allocator_type = AllocatorType<basic_json>;
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/// the type of an element pointer
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using pointer = typename std::allocator_traits<allocator_type>::pointer;
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/// the type of an element const pointer
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using const_pointer = typename std::allocator_traits<allocator_type>::const_pointer;
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/// an iterator for a basic_json container
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class iterator;
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/// a const iterator for a basic_json container
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class const_iterator;
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/// a reverse iterator for a basic_json container
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using reverse_iterator = json_reverse_iterator<typename basic_json::iterator>;
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/// a const reverse iterator for a basic_json container
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using const_reverse_iterator = json_reverse_iterator<typename basic_json::const_iterator>;
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/// @}
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/*!
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@brief returns the allocator associated with the container
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*/
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static allocator_type get_allocator()
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{
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return allocator_type();
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}
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///////////////////////////
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// JSON value data types //
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///////////////////////////
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/// @name JSON value data types
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/// The data types to store a JSON value. These types are derived from
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/// the template arguments passed to class @ref basic_json.
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/// @{
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/*!
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@brief a type for an object
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[RFC 7159](http://rfc7159.net/rfc7159) describes JSON objects as follows:
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> An object is an unordered collection of zero or more name/value pairs,
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> where a name is a string and a value is a string, number, boolean, null,
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> object, or array.
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To store objects in C++, a type is defined by the template parameters
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described below.
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@tparam ObjectType the container to store objects (e.g., `std::map` or
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`std::unordered_map`)
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@tparam StringType the type of the keys or names (e.g., `std::string`).
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The comparison function `std::less<StringType>` is used to order elements
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inside the container.
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@tparam AllocatorType the allocator to use for objects (e.g.,
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`std::allocator`)
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312 |
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#### Default type
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314 |
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With the default values for @a ObjectType (`std::map`), @a StringType
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(`std::string`), and @a AllocatorType (`std::allocator`), the default
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value for @a object_t is:
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318 |
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@code {.cpp}
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std::map<
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std::string, // key_type
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basic_json, // value_type
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std::less<std::string>, // key_compare
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std::allocator<std::pair<const std::string, basic_json>> // allocator_type
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>
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@endcode
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327 |
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328 |
#### Behavior
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329 |
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The choice of @a object_t influences the behavior of the JSON class. With
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the default type, objects have the following behavior:
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332 |
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- When all names are unique, objects will be interoperable in the sense
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that all software implementations receiving that object will agree on
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the name-value mappings.
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- When the names within an object are not unique, later stored name/value
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pairs overwrite previously stored name/value pairs, leaving the used
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names unique. For instance, `{"key": 1}` and `{"key": 2, "key": 1}` will
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339 |
be treated as equal and both stored as `{"key": 1}`.
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340 |
- Internally, name/value pairs are stored in lexicographical order of the
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341 |
names. Objects will also be serialized (see @ref dump) in this order.
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342 |
For instance, `{"b": 1, "a": 2}` and `{"a": 2, "b": 1}` will be stored
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|
343 |
and serialized as `{"a": 2, "b": 1}`.
|
|
|
344 |
- When comparing objects, the order of the name/value pairs is irrelevant.
|
|
|
345 |
This makes objects interoperable in the sense that they will not be
|
|
|
346 |
affected by these differences. For instance, `{"b": 1, "a": 2}` and
|
|
|
347 |
`{"a": 2, "b": 1}` will be treated as equal.
|
|
|
348 |
|
|
|
349 |
#### Limits
|
|
|
350 |
|
|
|
351 |
[RFC 7159](http://rfc7159.net/rfc7159) specifies:
|
|
|
352 |
> An implementation may set limits on the maximum depth of nesting.
|
|
|
353 |
|
|
|
354 |
In this class, the object's limit of nesting is not constraint explicitly.
|
|
|
355 |
However, a maximum depth of nesting may be introduced by the compiler or
|
|
|
356 |
runtime environment. A theoretical limit can be queried by calling the
|
|
|
357 |
@ref max_size function of a JSON object.
|
|
|
358 |
|
|
|
359 |
#### Storage
|
|
|
360 |
|
|
|
361 |
Objects are stored as pointers in a @ref basic_json type. That is, for any
|
|
|
362 |
access to object values, a pointer of type `object_t*` must be
|
|
|
363 |
dereferenced.
|
|
|
364 |
|
|
|
365 |
@sa @ref array_t -- type for an array value
|
|
|
366 |
|
|
|
367 |
@since version 1.0.0
|
|
|
368 |
|
|
|
369 |
@note The order name/value pairs are added to the object is *not*
|
|
|
370 |
preserved by the library. Therefore, iterating an object may return
|
|
|
371 |
name/value pairs in a different order than they were originally stored. In
|
|
|
372 |
fact, keys will be traversed in alphabetical order as `std::map` with
|
|
|
373 |
`std::less` is used by default. Please note this behavior conforms to [RFC
|
|
|
374 |
7159](http://rfc7159.net/rfc7159), because any order implements the
|
|
|
375 |
specified "unordered" nature of JSON objects.
|
|
|
376 |
*/
|
|
|
377 |
using object_t = ObjectType<StringType,
|
|
|
378 |
basic_json,
|
|
|
379 |
std::less<StringType>,
|
|
|
380 |
AllocatorType<std::pair<const StringType,
|
|
|
381 |
basic_json>>>;
|
|
|
382 |
|
|
|
383 |
/*!
|
|
|
384 |
@brief a type for an array
|
|
|
385 |
|
|
|
386 |
[RFC 7159](http://rfc7159.net/rfc7159) describes JSON arrays as follows:
|
|
|
387 |
> An array is an ordered sequence of zero or more values.
|
|
|
388 |
|
|
|
389 |
To store objects in C++, a type is defined by the template parameters
|
|
|
390 |
explained below.
|
|
|
391 |
|
|
|
392 |
@tparam ArrayType container type to store arrays (e.g., `std::vector` or
|
|
|
393 |
`std::list`)
|
|
|
394 |
@tparam AllocatorType allocator to use for arrays (e.g., `std::allocator`)
|
|
|
395 |
|
|
|
396 |
#### Default type
|
|
|
397 |
|
|
|
398 |
With the default values for @a ArrayType (`std::vector`) and @a
|
|
|
399 |
AllocatorType (`std::allocator`), the default value for @a array_t is:
|
|
|
400 |
|
|
|
401 |
@code {.cpp}
|
|
|
402 |
std::vector<
|
|
|
403 |
basic_json, // value_type
|
|
|
404 |
std::allocator<basic_json> // allocator_type
|
|
|
405 |
>
|
|
|
406 |
@endcode
|
|
|
407 |
|
|
|
408 |
#### Limits
|
|
|
409 |
|
|
|
410 |
[RFC 7159](http://rfc7159.net/rfc7159) specifies:
|
|
|
411 |
> An implementation may set limits on the maximum depth of nesting.
|
|
|
412 |
|
|
|
413 |
In this class, the array's limit of nesting is not constraint explicitly.
|
|
|
414 |
However, a maximum depth of nesting may be introduced by the compiler or
|
|
|
415 |
runtime environment. A theoretical limit can be queried by calling the
|
|
|
416 |
@ref max_size function of a JSON array.
|
|
|
417 |
|
|
|
418 |
#### Storage
|
|
|
419 |
|
|
|
420 |
Arrays are stored as pointers in a @ref basic_json type. That is, for any
|
|
|
421 |
access to array values, a pointer of type `array_t*` must be dereferenced.
|
|
|
422 |
|
|
|
423 |
@sa @ref object_t -- type for an object value
|
|
|
424 |
|
|
|
425 |
@since version 1.0.0
|
|
|
426 |
*/
|
|
|
427 |
using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;
|
|
|
428 |
|
|
|
429 |
/*!
|
|
|
430 |
@brief a type for a string
|
|
|
431 |
|
|
|
432 |
[RFC 7159](http://rfc7159.net/rfc7159) describes JSON strings as follows:
|
|
|
433 |
> A string is a sequence of zero or more Unicode characters.
|
|
|
434 |
|
|
|
435 |
To store objects in C++, a type is defined by the template parameter
|
|
|
436 |
described below. Unicode values are split by the JSON class into
|
|
|
437 |
byte-sized characters during deserialization.
|
|
|
438 |
|
|
|
439 |
@tparam StringType the container to store strings (e.g., `std::string`).
|
|
|
440 |
Note this container is used for keys/names in objects, see @ref object_t.
|
|
|
441 |
|
|
|
442 |
#### Default type
|
|
|
443 |
|
|
|
444 |
With the default values for @a StringType (`std::string`), the default
|
|
|
445 |
value for @a string_t is:
|
|
|
446 |
|
|
|
447 |
@code {.cpp}
|
|
|
448 |
std::string
|
|
|
449 |
@endcode
|
|
|
450 |
|
|
|
451 |
#### String comparison
|
|
|
452 |
|
|
|
453 |
[RFC 7159](http://rfc7159.net/rfc7159) states:
|
|
|
454 |
> Software implementations are typically required to test names of object
|
|
|
455 |
> members for equality. Implementations that transform the textual
|
|
|
456 |
> representation into sequences of Unicode code units and then perform the
|
|
|
457 |
> comparison numerically, code unit by code unit, are interoperable in the
|
|
|
458 |
> sense that implementations will agree in all cases on equality or
|
|
|
459 |
> inequality of two strings. For example, implementations that compare
|
|
|
460 |
> strings with escaped characters unconverted may incorrectly find that
|
|
|
461 |
> `"a\\b"` and `"a\u005Cb"` are not equal.
|
|
|
462 |
|
|
|
463 |
This implementation is interoperable as it does compare strings code unit
|
|
|
464 |
by code unit.
|
|
|
465 |
|
|
|
466 |
#### Storage
|
|
|
467 |
|
|
|
468 |
String values are stored as pointers in a @ref basic_json type. That is,
|
|
|
469 |
for any access to string values, a pointer of type `string_t*` must be
|
|
|
470 |
dereferenced.
|
|
|
471 |
|
|
|
472 |
@since version 1.0.0
|
|
|
473 |
*/
|
|
|
474 |
using string_t = StringType;
|
|
|
475 |
|
|
|
476 |
/*!
|
|
|
477 |
@brief a type for a boolean
|
|
|
478 |
|
|
|
479 |
[RFC 7159](http://rfc7159.net/rfc7159) implicitly describes a boolean as a
|
|
|
480 |
type which differentiates the two literals `true` and `false`.
|
|
|
481 |
|
|
|
482 |
To store objects in C++, a type is defined by the template parameter @a
|
|
|
483 |
BooleanType which chooses the type to use.
|
|
|
484 |
|
|
|
485 |
#### Default type
|
|
|
486 |
|
|
|
487 |
With the default values for @a BooleanType (`bool`), the default value for
|
|
|
488 |
@a boolean_t is:
|
|
|
489 |
|
|
|
490 |
@code {.cpp}
|
|
|
491 |
bool
|
|
|
492 |
@endcode
|
|
|
493 |
|
|
|
494 |
#### Storage
|
|
|
495 |
|
|
|
496 |
Boolean values are stored directly inside a @ref basic_json type.
|
|
|
497 |
|
|
|
498 |
@since version 1.0.0
|
|
|
499 |
*/
|
|
|
500 |
using boolean_t = BooleanType;
|
|
|
501 |
|
|
|
502 |
/*!
|
|
|
503 |
@brief a type for a number (integer)
|
|
|
504 |
|
|
|
505 |
[RFC 7159](http://rfc7159.net/rfc7159) describes numbers as follows:
|
|
|
506 |
> The representation of numbers is similar to that used in most
|
|
|
507 |
> programming languages. A number is represented in base 10 using decimal
|
|
|
508 |
> digits. It contains an integer component that may be prefixed with an
|
|
|
509 |
> optional minus sign, which may be followed by a fraction part and/or an
|
|
|
510 |
> exponent part. Leading zeros are not allowed. (...) Numeric values that
|
|
|
511 |
> cannot be represented in the grammar below (such as Infinity and NaN)
|
|
|
512 |
> are not permitted.
|
|
|
513 |
|
|
|
514 |
This description includes both integer and floating-point numbers.
|
|
|
515 |
However, C++ allows more precise storage if it is known whether the number
|
|
|
516 |
is a signed integer, an unsigned integer or a floating-point number.
|
|
|
517 |
Therefore, three different types, @ref number_integer_t, @ref
|
|
|
518 |
number_unsigned_t and @ref number_float_t are used.
|
|
|
519 |
|
|
|
520 |
To store integer numbers in C++, a type is defined by the template
|
|
|
521 |
parameter @a NumberIntegerType which chooses the type to use.
|
|
|
522 |
|
|
|
523 |
#### Default type
|
|
|
524 |
|
|
|
525 |
With the default values for @a NumberIntegerType (`int64_t`), the default
|
|
|
526 |
value for @a number_integer_t is:
|
|
|
527 |
|
|
|
528 |
@code {.cpp}
|
|
|
529 |
int64_t
|
|
|
530 |
@endcode
|
|
|
531 |
|
|
|
532 |
#### Default behavior
|
|
|
533 |
|
|
|
534 |
- The restrictions about leading zeros is not enforced in C++. Instead,
|
|
|
535 |
leading zeros in integer literals lead to an interpretation as octal
|
|
|
536 |
number. Internally, the value will be stored as decimal number. For
|
|
|
537 |
instance, the C++ integer literal `010` will be serialized to `8`.
|
|
|
538 |
During deserialization, leading zeros yield an error.
|
|
|
539 |
- Not-a-number (NaN) values will be serialized to `null`.
|
|
|
540 |
|
|
|
541 |
#### Limits
|
|
|
542 |
|
|
|
543 |
[RFC 7159](http://rfc7159.net/rfc7159) specifies:
|
|
|
544 |
> An implementation may set limits on the range and precision of numbers.
|
|
|
545 |
|
|
|
546 |
When the default type is used, the maximal integer number that can be
|
|
|
547 |
stored is `9223372036854775807` (INT64_MAX) and the minimal integer number
|
|
|
548 |
that can be stored is `-9223372036854775808` (INT64_MIN). Integer numbers
|
|
|
549 |
that are out of range will yield over/underflow when used in a
|
|
|
550 |
constructor. During deserialization, too large or small integer numbers
|
|
|
551 |
will be automatically be stored as @ref number_unsigned_t or @ref
|
|
|
552 |
number_float_t.
|
|
|
553 |
|
|
|
554 |
[RFC 7159](http://rfc7159.net/rfc7159) further states:
|
|
|
555 |
> Note that when such software is used, numbers that are integers and are
|
|
|
556 |
> in the range \f$[-2^{53}+1, 2^{53}-1]\f$ are interoperable in the sense
|
|
|
557 |
> that implementations will agree exactly on their numeric values.
|
|
|
558 |
|
|
|
559 |
As this range is a subrange of the exactly supported range [INT64_MIN,
|
|
|
560 |
INT64_MAX], this class's integer type is interoperable.
|
|
|
561 |
|
|
|
562 |
#### Storage
|
|
|
563 |
|
|
|
564 |
Integer number values are stored directly inside a @ref basic_json type.
|
|
|
565 |
|
|
|
566 |
@sa @ref number_float_t -- type for number values (floating-point)
|
|
|
567 |
|
|
|
568 |
@sa @ref number_unsigned_t -- type for number values (unsigned integer)
|
|
|
569 |
|
|
|
570 |
@since version 1.0.0
|
|
|
571 |
*/
|
|
|
572 |
using number_integer_t = NumberIntegerType;
|
|
|
573 |
|
|
|
574 |
/*!
|
|
|
575 |
@brief a type for a number (unsigned)
|
|
|
576 |
|
|
|
577 |
[RFC 7159](http://rfc7159.net/rfc7159) describes numbers as follows:
|
|
|
578 |
> The representation of numbers is similar to that used in most
|
|
|
579 |
> programming languages. A number is represented in base 10 using decimal
|
|
|
580 |
> digits. It contains an integer component that may be prefixed with an
|
|
|
581 |
> optional minus sign, which may be followed by a fraction part and/or an
|
|
|
582 |
> exponent part. Leading zeros are not allowed. (...) Numeric values that
|
|
|
583 |
> cannot be represented in the grammar below (such as Infinity and NaN)
|
|
|
584 |
> are not permitted.
|
|
|
585 |
|
|
|
586 |
This description includes both integer and floating-point numbers.
|
|
|
587 |
However, C++ allows more precise storage if it is known whether the number
|
|
|
588 |
is a signed integer, an unsigned integer or a floating-point number.
|
|
|
589 |
Therefore, three different types, @ref number_integer_t, @ref
|
|
|
590 |
number_unsigned_t and @ref number_float_t are used.
|
|
|
591 |
|
|
|
592 |
To store unsigned integer numbers in C++, a type is defined by the
|
|
|
593 |
template parameter @a NumberUnsignedType which chooses the type to use.
|
|
|
594 |
|
|
|
595 |
#### Default type
|
|
|
596 |
|
|
|
597 |
With the default values for @a NumberUnsignedType (`uint64_t`), the
|
|
|
598 |
default value for @a number_unsigned_t is:
|
|
|
599 |
|
|
|
600 |
@code {.cpp}
|
|
|
601 |
uint64_t
|
|
|
602 |
@endcode
|
|
|
603 |
|
|
|
604 |
#### Default behavior
|
|
|
605 |
|
|
|
606 |
- The restrictions about leading zeros is not enforced in C++. Instead,
|
|
|
607 |
leading zeros in integer literals lead to an interpretation as octal
|
|
|
608 |
number. Internally, the value will be stored as decimal number. For
|
|
|
609 |
instance, the C++ integer literal `010` will be serialized to `8`.
|
|
|
610 |
During deserialization, leading zeros yield an error.
|
|
|
611 |
- Not-a-number (NaN) values will be serialized to `null`.
|
|
|
612 |
|
|
|
613 |
#### Limits
|
|
|
614 |
|
|
|
615 |
[RFC 7159](http://rfc7159.net/rfc7159) specifies:
|
|
|
616 |
> An implementation may set limits on the range and precision of numbers.
|
|
|
617 |
|
|
|
618 |
When the default type is used, the maximal integer number that can be
|
|
|
619 |
stored is `18446744073709551615` (UINT64_MAX) and the minimal integer
|
|
|
620 |
number that can be stored is `0`. Integer numbers that are out of range
|
|
|
621 |
will yield over/underflow when used in a constructor. During
|
|
|
622 |
deserialization, too large or small integer numbers will be automatically
|
|
|
623 |
be stored as @ref number_integer_t or @ref number_float_t.
|
|
|
624 |
|
|
|
625 |
[RFC 7159](http://rfc7159.net/rfc7159) further states:
|
|
|
626 |
> Note that when such software is used, numbers that are integers and are
|
|
|
627 |
> in the range \f$[-2^{53}+1, 2^{53}-1]\f$ are interoperable in the sense
|
|
|
628 |
> that implementations will agree exactly on their numeric values.
|
|
|
629 |
|
|
|
630 |
As this range is a subrange (when considered in conjunction with the
|
|
|
631 |
number_integer_t type) of the exactly supported range [0, UINT64_MAX],
|
|
|
632 |
this class's integer type is interoperable.
|
|
|
633 |
|
|
|
634 |
#### Storage
|
|
|
635 |
|
|
|
636 |
Integer number values are stored directly inside a @ref basic_json type.
|
|
|
637 |
|
|
|
638 |
@sa @ref number_float_t -- type for number values (floating-point)
|
|
|
639 |
@sa @ref number_integer_t -- type for number values (integer)
|
|
|
640 |
|
|
|
641 |
@since version 2.0.0
|
|
|
642 |
*/
|
|
|
643 |
using number_unsigned_t = NumberUnsignedType;
|
|
|
644 |
|
|
|
645 |
/*!
|
|
|
646 |
@brief a type for a number (floating-point)
|
|
|
647 |
|
|
|
648 |
[RFC 7159](http://rfc7159.net/rfc7159) describes numbers as follows:
|
|
|
649 |
> The representation of numbers is similar to that used in most
|
|
|
650 |
> programming languages. A number is represented in base 10 using decimal
|
|
|
651 |
> digits. It contains an integer component that may be prefixed with an
|
|
|
652 |
> optional minus sign, which may be followed by a fraction part and/or an
|
|
|
653 |
> exponent part. Leading zeros are not allowed. (...) Numeric values that
|
|
|
654 |
> cannot be represented in the grammar below (such as Infinity and NaN)
|
|
|
655 |
> are not permitted.
|
|
|
656 |
|
|
|
657 |
This description includes both integer and floating-point numbers.
|
|
|
658 |
However, C++ allows more precise storage if it is known whether the number
|
|
|
659 |
is a signed integer, an unsigned integer or a floating-point number.
|
|
|
660 |
Therefore, three different types, @ref number_integer_t, @ref
|
|
|
661 |
number_unsigned_t and @ref number_float_t are used.
|
|
|
662 |
|
|
|
663 |
To store floating-point numbers in C++, a type is defined by the template
|
|
|
664 |
parameter @a NumberFloatType which chooses the type to use.
|
|
|
665 |
|
|
|
666 |
#### Default type
|
|
|
667 |
|
|
|
668 |
With the default values for @a NumberFloatType (`double`), the default
|
|
|
669 |
value for @a number_float_t is:
|
|
|
670 |
|
|
|
671 |
@code {.cpp}
|
|
|
672 |
double
|
|
|
673 |
@endcode
|
|
|
674 |
|
|
|
675 |
#### Default behavior
|
|
|
676 |
|
|
|
677 |
- The restrictions about leading zeros is not enforced in C++. Instead,
|
|
|
678 |
leading zeros in floating-point literals will be ignored. Internally,
|
|
|
679 |
the value will be stored as decimal number. For instance, the C++
|
|
|
680 |
floating-point literal `01.2` will be serialized to `1.2`. During
|
|
|
681 |
deserialization, leading zeros yield an error.
|
|
|
682 |
- Not-a-number (NaN) values will be serialized to `null`.
|
|
|
683 |
|
|
|
684 |
#### Limits
|
|
|
685 |
|
|
|
686 |
[RFC 7159](http://rfc7159.net/rfc7159) states:
|
|
|
687 |
> This specification allows implementations to set limits on the range and
|
|
|
688 |
> precision of numbers accepted. Since software that implements IEEE
|
|
|
689 |
> 754-2008 binary64 (double precision) numbers is generally available and
|
|
|
690 |
> widely used, good interoperability can be achieved by implementations
|
|
|
691 |
> that expect no more precision or range than these provide, in the sense
|
|
|
692 |
> that implementations will approximate JSON numbers within the expected
|
|
|
693 |
> precision.
|
|
|
694 |
|
|
|
695 |
This implementation does exactly follow this approach, as it uses double
|
|
|
696 |
precision floating-point numbers. Note values smaller than
|
|
|
697 |
`-1.79769313486232e+308` and values greater than `1.79769313486232e+308`
|
|
|
698 |
will be stored as NaN internally and be serialized to `null`.
|
|
|
699 |
|
|
|
700 |
#### Storage
|
|
|
701 |
|
|
|
702 |
Floating-point number values are stored directly inside a @ref basic_json
|
|
|
703 |
type.
|
|
|
704 |
|
|
|
705 |
@sa @ref number_integer_t -- type for number values (integer)
|
|
|
706 |
|
|
|
707 |
@sa @ref number_unsigned_t -- type for number values (unsigned integer)
|
|
|
708 |
|
|
|
709 |
@since version 1.0.0
|
|
|
710 |
*/
|
|
|
711 |
using number_float_t = NumberFloatType;
|
|
|
712 |
|
|
|
713 |
/// @}
|
|
|
714 |
|
|
|
715 |
|
|
|
716 |
///////////////////////////
|
|
|
717 |
// JSON type enumeration //
|
|
|
718 |
///////////////////////////
|
|
|
719 |
|
|
|
720 |
/*!
|
|
|
721 |
@brief the JSON type enumeration
|
|
|
722 |
|
|
|
723 |
This enumeration collects the different JSON types. It is internally used
|
|
|
724 |
to distinguish the stored values, and the functions @ref is_null(), @ref
|
|
|
725 |
is_object(), @ref is_array(), @ref is_string(), @ref is_boolean(), @ref
|
|
|
726 |
is_number() (with @ref is_number_integer(), @ref is_number_unsigned(), and
|
|
|
727 |
@ref is_number_float()), @ref is_discarded(), @ref is_primitive(), and
|
|
|
728 |
@ref is_structured() rely on it.
|
|
|
729 |
|
|
|
730 |
@note There are three enumeration entries (number_integer,
|
|
|
731 |
number_unsigned, and number_float), because the library distinguishes
|
|
|
732 |
these three types for numbers: @ref number_unsigned_t is used for unsigned
|
|
|
733 |
integers, @ref number_integer_t is used for signed integers, and @ref
|
|
|
734 |
number_float_t is used for floating-point numbers or to approximate
|
|
|
735 |
integers which do not fit in the limits of their respective type.
|
|
|
736 |
|
|
|
737 |
@sa @ref basic_json(const value_t value_type) -- create a JSON value with
|
|
|
738 |
the default value for a given type
|
|
|
739 |
|
|
|
740 |
@since version 1.0.0
|
|
|
741 |
*/
|
|
|
742 |
enum class value_t : uint8_t
|
|
|
743 |
{
|
|
|
744 |
null, ///< null value
|
|
|
745 |
object, ///< object (unordered set of name/value pairs)
|
|
|
746 |
array, ///< array (ordered collection of values)
|
|
|
747 |
string, ///< string value
|
|
|
748 |
boolean, ///< boolean value
|
|
|
749 |
number_integer, ///< number value (signed integer)
|
|
|
750 |
number_unsigned, ///< number value (unsigned integer)
|
|
|
751 |
number_float, ///< number value (floating-point)
|
|
|
752 |
discarded ///< discarded by the the parser callback function
|
|
|
753 |
};
|
|
|
754 |
|
|
|
755 |
|
|
|
756 |
private:
|
|
|
757 |
|
|
|
758 |
/// helper for exception-safe object creation
|
|
|
759 |
template<typename T, typename... Args>
|
|
|
760 |
static T* create(Args&& ... args)
|
|
|
761 |
{
|
|
|
762 |
AllocatorType<T> alloc;
|
|
|
763 |
auto deleter = [&](T * object)
|
|
|
764 |
{
|
|
|
765 |
alloc.deallocate(object, 1);
|
|
|
766 |
};
|
|
|
767 |
std::unique_ptr<T, decltype(deleter)> object(alloc.allocate(1), deleter);
|
|
|
768 |
alloc.construct(object.get(), std::forward<Args>(args)...);
|
|
|
769 |
assert(object.get() != nullptr);
|
|
|
770 |
return object.release();
|
|
|
771 |
}
|
|
|
772 |
|
|
|
773 |
////////////////////////
|
|
|
774 |
// JSON value storage //
|
|
|
775 |
////////////////////////
|
|
|
776 |
|
|
|
777 |
/*!
|
|
|
778 |
@brief a JSON value
|
|
|
779 |
|
|
|
780 |
The actual storage for a JSON value of the @ref basic_json class. This
|
|
|
781 |
union combines the different storage types for the JSON value types
|
|
|
782 |
defined in @ref value_t.
|
|
|
783 |
|
|
|
784 |
JSON type | value_t type | used type
|
|
|
785 |
--------- | --------------- | ------------------------
|
|
|
786 |
object | object | pointer to @ref object_t
|
|
|
787 |
array | array | pointer to @ref array_t
|
|
|
788 |
string | string | pointer to @ref string_t
|
|
|
789 |
boolean | boolean | @ref boolean_t
|
|
|
790 |
number | number_integer | @ref number_integer_t
|
|
|
791 |
number | number_unsigned | @ref number_unsigned_t
|
|
|
792 |
number | number_float | @ref number_float_t
|
|
|
793 |
null | null | *no value is stored*
|
|
|
794 |
|
|
|
795 |
@note Variable-length types (objects, arrays, and strings) are stored as
|
|
|
796 |
pointers. The size of the union should not exceed 64 bits if the default
|
|
|
797 |
value types are used.
|
|
|
798 |
|
|
|
799 |
@since version 1.0.0
|
|
|
800 |
*/
|
|
|
801 |
union json_value
|
|
|
802 |
{
|
|
|
803 |
/// object (stored with pointer to save storage)
|
|
|
804 |
object_t* object;
|
|
|
805 |
/// array (stored with pointer to save storage)
|
|
|
806 |
array_t* array;
|
|
|
807 |
/// string (stored with pointer to save storage)
|
|
|
808 |
string_t* string;
|
|
|
809 |
/// boolean
|
|
|
810 |
boolean_t boolean;
|
|
|
811 |
/// number (integer)
|
|
|
812 |
number_integer_t number_integer;
|
|
|
813 |
/// number (unsigned integer)
|
|
|
814 |
number_unsigned_t number_unsigned;
|
|
|
815 |
/// number (floating-point)
|
|
|
816 |
number_float_t number_float;
|
|
|
817 |
|
|
|
818 |
/// default constructor (for null values)
|
|
|
819 |
json_value() = default;
|
|
|
820 |
/// constructor for booleans
|
|
|
821 |
json_value(boolean_t v) noexcept : boolean(v) {}
|
|
|
822 |
/// constructor for numbers (integer)
|
|
|
823 |
json_value(number_integer_t v) noexcept : number_integer(v) {}
|
|
|
824 |
/// constructor for numbers (unsigned)
|
|
|
825 |
json_value(number_unsigned_t v) noexcept : number_unsigned(v) {}
|
|
|
826 |
/// constructor for numbers (floating-point)
|
|
|
827 |
json_value(number_float_t v) noexcept : number_float(v) {}
|
|
|
828 |
/// constructor for empty values of a given type
|
|
|
829 |
json_value(value_t t)
|
|
|
830 |
{
|
|
|
831 |
switch (t)
|
|
|
832 |
{
|
|
|
833 |
case value_t::object:
|
|
|
834 |
{
|
|
|
835 |
object = create<object_t>();
|
|
|
836 |
break;
|
|
|
837 |
}
|
|
|
838 |
|
|
|
839 |
case value_t::array:
|
|
|
840 |
{
|
|
|
841 |
array = create<array_t>();
|
|
|
842 |
break;
|
|
|
843 |
}
|
|
|
844 |
|
|
|
845 |
case value_t::string:
|
|
|
846 |
{
|
|
|
847 |
string = create<string_t>("");
|
|
|
848 |
break;
|
|
|
849 |
}
|
|
|
850 |
|
|
|
851 |
case value_t::boolean:
|
|
|
852 |
{
|
|
|
853 |
boolean = boolean_t(false);
|
|
|
854 |
break;
|
|
|
855 |
}
|
|
|
856 |
|
|
|
857 |
case value_t::number_integer:
|
|
|
858 |
{
|
|
|
859 |
number_integer = number_integer_t(0);
|
|
|
860 |
break;
|
|
|
861 |
}
|
|
|
862 |
|
|
|
863 |
case value_t::number_unsigned:
|
|
|
864 |
{
|
|
|
865 |
number_unsigned = number_unsigned_t(0);
|
|
|
866 |
break;
|
|
|
867 |
}
|
|
|
868 |
|
|
|
869 |
case value_t::number_float:
|
|
|
870 |
{
|
|
|
871 |
number_float = number_float_t(0.0);
|
|
|
872 |
break;
|
|
|
873 |
}
|
|
|
874 |
|
|
|
875 |
default:
|
|
|
876 |
{
|
|
|
877 |
break;
|
|
|
878 |
}
|
|
|
879 |
}
|
|
|
880 |
}
|
|
|
881 |
|
|
|
882 |
/// constructor for strings
|
|
|
883 |
json_value(const string_t& value)
|
|
|
884 |
{
|
|
|
885 |
string = create<string_t>(value);
|
|
|
886 |
}
|
|
|
887 |
|
|
|
888 |
/// constructor for objects
|
|
|
889 |
json_value(const object_t& value)
|
|
|
890 |
{
|
|
|
891 |
object = create<object_t>(value);
|
|
|
892 |
}
|
|
|
893 |
|
|
|
894 |
/// constructor for arrays
|
|
|
895 |
json_value(const array_t& value)
|
|
|
896 |
{
|
|
|
897 |
array = create<array_t>(value);
|
|
|
898 |
}
|
|
|
899 |
};
|
|
|
900 |
|
|
|
901 |
/*!
|
|
|
902 |
@brief checks the class invariants
|
|
|
903 |
|
|
|
904 |
This function asserts the class invariants. It needs to be called at the
|
|
|
905 |
end of every constructor to make sure that created objects respect the
|
|
|
906 |
invariant. Furthermore, it has to be called each time the type of a JSON
|
|
|
907 |
value is changed, because the invariant expresses a relationship between
|
|
|
908 |
@a m_type and @a m_value.
|
|
|
909 |
*/
|
|
|
910 |
void assert_invariant() const
|
|
|
911 |
{
|
|
|
912 |
assert(m_type != value_t::object or m_value.object != nullptr);
|
|
|
913 |
assert(m_type != value_t::array or m_value.array != nullptr);
|
|
|
914 |
assert(m_type != value_t::string or m_value.string != nullptr);
|
|
|
915 |
}
|
|
|
916 |
|
|
|
917 |
public:
|
|
|
918 |
//////////////////////////
|
|
|
919 |
// JSON parser callback //
|
|
|
920 |
//////////////////////////
|
|
|
921 |
|
|
|
922 |
/*!
|
|
|
923 |
@brief JSON callback events
|
|
|
924 |
|
|
|
925 |
This enumeration lists the parser events that can trigger calling a
|
|
|
926 |
callback function of type @ref parser_callback_t during parsing.
|
|
|
927 |
|
|
|
928 |
@image html callback_events.png "Example when certain parse events are triggered"
|
|
|
929 |
|
|
|
930 |
@since version 1.0.0
|
|
|
931 |
*/
|
|
|
932 |
enum class parse_event_t : uint8_t
|
|
|
933 |
{
|
|
|
934 |
/// the parser read `{` and started to process a JSON object
|
|
|
935 |
object_start,
|
|
|
936 |
/// the parser read `}` and finished processing a JSON object
|
|
|
937 |
object_end,
|
|
|
938 |
/// the parser read `[` and started to process a JSON array
|
|
|
939 |
array_start,
|
|
|
940 |
/// the parser read `]` and finished processing a JSON array
|
|
|
941 |
array_end,
|
|
|
942 |
/// the parser read a key of a value in an object
|
|
|
943 |
key,
|
|
|
944 |
/// the parser finished reading a JSON value
|
|
|
945 |
value
|
|
|
946 |
};
|
|
|
947 |
|
|
|
948 |
/*!
|
|
|
949 |
@brief per-element parser callback type
|
|
|
950 |
|
|
|
951 |
With a parser callback function, the result of parsing a JSON text can be
|
|
|
952 |
influenced. When passed to @ref parse(std::istream&, const
|
|
|
953 |
parser_callback_t) or @ref parse(const string_t&, const parser_callback_t),
|
|
|
954 |
it is called on certain events (passed as @ref parse_event_t via parameter
|
|
|
955 |
@a event) with a set recursion depth @a depth and context JSON value
|
|
|
956 |
@a parsed. The return value of the callback function is a boolean
|
|
|
957 |
indicating whether the element that emitted the callback shall be kept or
|
|
|
958 |
not.
|
|
|
959 |
|
|
|
960 |
We distinguish six scenarios (determined by the event type) in which the
|
|
|
961 |
callback function can be called. The following table describes the values
|
|
|
962 |
of the parameters @a depth, @a event, and @a parsed.
|
|
|
963 |
|
|
|
964 |
parameter @a event | description | parameter @a depth | parameter @a parsed
|
|
|
965 |
------------------ | ----------- | ------------------ | -------------------
|
|
|
966 |
parse_event_t::object_start | the parser read `{` and started to process a JSON object | depth of the parent of the JSON object | a JSON value with type discarded
|
|
|
967 |
parse_event_t::key | the parser read a key of a value in an object | depth of the currently parsed JSON object | a JSON string containing the key
|
|
|
968 |
parse_event_t::object_end | the parser read `}` and finished processing a JSON object | depth of the parent of the JSON object | the parsed JSON object
|
|
|
969 |
parse_event_t::array_start | the parser read `[` and started to process a JSON array | depth of the parent of the JSON array | a JSON value with type discarded
|
|
|
970 |
parse_event_t::array_end | the parser read `]` and finished processing a JSON array | depth of the parent of the JSON array | the parsed JSON array
|
|
|
971 |
parse_event_t::value | the parser finished reading a JSON value | depth of the value | the parsed JSON value
|
|
|
972 |
|
|
|
973 |
@image html callback_events.png "Example when certain parse events are triggered"
|
|
|
974 |
|
|
|
975 |
Discarding a value (i.e., returning `false`) has different effects
|
|
|
976 |
depending on the context in which function was called:
|
|
|
977 |
|
|
|
978 |
- Discarded values in structured types are skipped. That is, the parser
|
|
|
979 |
will behave as if the discarded value was never read.
|
|
|
980 |
- In case a value outside a structured type is skipped, it is replaced
|
|
|
981 |
with `null`. This case happens if the top-level element is skipped.
|
|
|
982 |
|
|
|
983 |
@param[in] depth the depth of the recursion during parsing
|
|
|
984 |
|
|
|
985 |
@param[in] event an event of type parse_event_t indicating the context in
|
|
|
986 |
the callback function has been called
|
|
|
987 |
|
|
|
988 |
@param[in,out] parsed the current intermediate parse result; note that
|
|
|
989 |
writing to this value has no effect for parse_event_t::key events
|
|
|
990 |
|
|
|
991 |
@return Whether the JSON value which called the function during parsing
|
|
|
992 |
should be kept (`true`) or not (`false`). In the latter case, it is either
|
|
|
993 |
skipped completely or replaced by an empty discarded object.
|
|
|
994 |
|
|
|
995 |
@sa @ref parse(std::istream&, parser_callback_t) or
|
|
|
996 |
@ref parse(const string_t&, parser_callback_t) for examples
|
|
|
997 |
|
|
|
998 |
@since version 1.0.0
|
|
|
999 |
*/
|
|
|
1000 |
using parser_callback_t = std::function<bool(int depth,
|
|
|
1001 |
parse_event_t event,
|
|
|
1002 |
basic_json& parsed)>;
|
|
|
1003 |
|
|
|
1004 |
|
|
|
1005 |
//////////////////
|
|
|
1006 |
// constructors //
|
|
|
1007 |
//////////////////
|
|
|
1008 |
|
|
|
1009 |
/// @name constructors and destructors
|
|
|
1010 |
/// Constructors of class @ref basic_json, copy/move constructor, copy
|
|
|
1011 |
/// assignment, static functions creating objects, and the destructor.
|
|
|
1012 |
/// @{
|
|
|
1013 |
|
|
|
1014 |
/*!
|
|
|
1015 |
@brief create an empty value with a given type
|
|
|
1016 |
|
|
|
1017 |
Create an empty JSON value with a given type. The value will be default
|
|
|
1018 |
initialized with an empty value which depends on the type:
|
|
|
1019 |
|
|
|
1020 |
Value type | initial value
|
|
|
1021 |
----------- | -------------
|
|
|
1022 |
null | `null`
|
|
|
1023 |
boolean | `false`
|
|
|
1024 |
string | `""`
|
|
|
1025 |
number | `0`
|
|
|
1026 |
object | `{}`
|
|
|
1027 |
array | `[]`
|
|
|
1028 |
|
|
|
1029 |
@param[in] value_type the type of the value to create
|
|
|
1030 |
|
|
|
1031 |
@complexity Constant.
|
|
|
1032 |
|
|
|
1033 |
@throw std::bad_alloc if allocation for object, array, or string value
|
|
|
1034 |
fails
|
|
|
1035 |
|
|
|
1036 |
@liveexample{The following code shows the constructor for different @ref
|
|
|
1037 |
value_t values,basic_json__value_t}
|
|
|
1038 |
|
|
|
1039 |
@sa @ref basic_json(std::nullptr_t) -- create a `null` value
|
|
|
1040 |
@sa @ref basic_json(boolean_t value) -- create a boolean value
|
|
|
1041 |
@sa @ref basic_json(const string_t&) -- create a string value
|
|
|
1042 |
@sa @ref basic_json(const object_t&) -- create a object value
|
|
|
1043 |
@sa @ref basic_json(const array_t&) -- create a array value
|
|
|
1044 |
@sa @ref basic_json(const number_float_t) -- create a number
|
|
|
1045 |
(floating-point) value
|
|
|
1046 |
@sa @ref basic_json(const number_integer_t) -- create a number (integer)
|
|
|
1047 |
value
|
|
|
1048 |
@sa @ref basic_json(const number_unsigned_t) -- create a number (unsigned)
|
|
|
1049 |
value
|
|
|
1050 |
|
|
|
1051 |
@since version 1.0.0
|
|
|
1052 |
*/
|
|
|
1053 |
basic_json(const value_t value_type)
|
|
|
1054 |
: m_type(value_type), m_value(value_type)
|
|
|
1055 |
{
|
|
|
1056 |
assert_invariant();
|
|
|
1057 |
}
|
|
|
1058 |
|
|
|
1059 |
/*!
|
|
|
1060 |
@brief create a null object (implicitly)
|
|
|
1061 |
|
|
|
1062 |
Create a `null` JSON value. This is the implicit version of the `null`
|
|
|
1063 |
value constructor as it takes no parameters.
|
|
|
1064 |
|
|
|
1065 |
@note The class invariant is satisfied, because it poses no requirements
|
|
|
1066 |
for null values.
|
|
|
1067 |
|
|
|
1068 |
@complexity Constant.
|
|
|
1069 |
|
|
|
1070 |
@exceptionsafety No-throw guarantee: this constructor never throws
|
|
|
1071 |
exceptions.
|
|
|
1072 |
|
|
|
1073 |
@requirement This function helps `basic_json` satisfying the
|
|
|
1074 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
1075 |
requirements:
|
|
|
1076 |
- The complexity is constant.
|
|
|
1077 |
- As postcondition, it holds: `basic_json().empty() == true`.
|
|
|
1078 |
|
|
|
1079 |
@liveexample{The following code shows the constructor for a `null` JSON
|
|
|
1080 |
value.,basic_json}
|
|
|
1081 |
|
|
|
1082 |
@sa @ref basic_json(std::nullptr_t) -- create a `null` value
|
|
|
1083 |
|
|
|
1084 |
@since version 1.0.0
|
|
|
1085 |
*/
|
|
|
1086 |
basic_json() = default;
|
|
|
1087 |
|
|
|
1088 |
/*!
|
|
|
1089 |
@brief create a null object (explicitly)
|
|
|
1090 |
|
|
|
1091 |
Create a `null` JSON value. This is the explicitly version of the `null`
|
|
|
1092 |
value constructor as it takes a null pointer as parameter. It allows to
|
|
|
1093 |
create `null` values by explicitly assigning a `nullptr` to a JSON value.
|
|
|
1094 |
The passed null pointer itself is not read -- it is only used to choose
|
|
|
1095 |
the right constructor.
|
|
|
1096 |
|
|
|
1097 |
@complexity Constant.
|
|
|
1098 |
|
|
|
1099 |
@exceptionsafety No-throw guarantee: this constructor never throws
|
|
|
1100 |
exceptions.
|
|
|
1101 |
|
|
|
1102 |
@liveexample{The following code shows the constructor with null pointer
|
|
|
1103 |
parameter.,basic_json__nullptr_t}
|
|
|
1104 |
|
|
|
1105 |
@sa @ref basic_json() -- default constructor (implicitly creating a `null`
|
|
|
1106 |
value)
|
|
|
1107 |
|
|
|
1108 |
@since version 1.0.0
|
|
|
1109 |
*/
|
|
|
1110 |
basic_json(std::nullptr_t) noexcept
|
|
|
1111 |
: basic_json(value_t::null)
|
|
|
1112 |
{
|
|
|
1113 |
assert_invariant();
|
|
|
1114 |
}
|
|
|
1115 |
|
|
|
1116 |
/*!
|
|
|
1117 |
@brief create an object (explicit)
|
|
|
1118 |
|
|
|
1119 |
Create an object JSON value with a given content.
|
|
|
1120 |
|
|
|
1121 |
@param[in] val a value for the object
|
|
|
1122 |
|
|
|
1123 |
@complexity Linear in the size of the passed @a val.
|
|
|
1124 |
|
|
|
1125 |
@throw std::bad_alloc if allocation for object value fails
|
|
|
1126 |
|
|
|
1127 |
@liveexample{The following code shows the constructor with an @ref
|
|
|
1128 |
object_t parameter.,basic_json__object_t}
|
|
|
1129 |
|
|
|
1130 |
@sa @ref basic_json(const CompatibleObjectType&) -- create an object value
|
|
|
1131 |
from a compatible STL container
|
|
|
1132 |
|
|
|
1133 |
@since version 1.0.0
|
|
|
1134 |
*/
|
|
|
1135 |
basic_json(const object_t& val)
|
|
|
1136 |
: m_type(value_t::object), m_value(val)
|
|
|
1137 |
{
|
|
|
1138 |
assert_invariant();
|
|
|
1139 |
}
|
|
|
1140 |
|
|
|
1141 |
/*!
|
|
|
1142 |
@brief create an object (implicit)
|
|
|
1143 |
|
|
|
1144 |
Create an object JSON value with a given content. This constructor allows
|
|
|
1145 |
any type @a CompatibleObjectType that can be used to construct values of
|
|
|
1146 |
type @ref object_t.
|
|
|
1147 |
|
|
|
1148 |
@tparam CompatibleObjectType An object type whose `key_type` and
|
|
|
1149 |
`value_type` is compatible to @ref object_t. Examples include `std::map`,
|
|
|
1150 |
`std::unordered_map`, `std::multimap`, and `std::unordered_multimap` with
|
|
|
1151 |
a `key_type` of `std::string`, and a `value_type` from which a @ref
|
|
|
1152 |
basic_json value can be constructed.
|
|
|
1153 |
|
|
|
1154 |
@param[in] val a value for the object
|
|
|
1155 |
|
|
|
1156 |
@complexity Linear in the size of the passed @a val.
|
|
|
1157 |
|
|
|
1158 |
@throw std::bad_alloc if allocation for object value fails
|
|
|
1159 |
|
|
|
1160 |
@liveexample{The following code shows the constructor with several
|
|
|
1161 |
compatible object type parameters.,basic_json__CompatibleObjectType}
|
|
|
1162 |
|
|
|
1163 |
@sa @ref basic_json(const object_t&) -- create an object value
|
|
|
1164 |
|
|
|
1165 |
@since version 1.0.0
|
|
|
1166 |
*/
|
|
|
1167 |
template <class CompatibleObjectType, typename
|
|
|
1168 |
std::enable_if<
|
|
|
1169 |
std::is_constructible<typename object_t::key_type, typename CompatibleObjectType::key_type>::value and
|
|
|
1170 |
std::is_constructible<basic_json, typename CompatibleObjectType::mapped_type>::value, int>::type
|
|
|
1171 |
= 0>
|
|
|
1172 |
basic_json(const CompatibleObjectType& val)
|
|
|
1173 |
: m_type(value_t::object)
|
|
|
1174 |
{
|
|
|
1175 |
using std::begin;
|
|
|
1176 |
using std::end;
|
|
|
1177 |
m_value.object = create<object_t>(begin(val), end(val));
|
|
|
1178 |
assert_invariant();
|
|
|
1179 |
}
|
|
|
1180 |
|
|
|
1181 |
/*!
|
|
|
1182 |
@brief create an array (explicit)
|
|
|
1183 |
|
|
|
1184 |
Create an array JSON value with a given content.
|
|
|
1185 |
|
|
|
1186 |
@param[in] val a value for the array
|
|
|
1187 |
|
|
|
1188 |
@complexity Linear in the size of the passed @a val.
|
|
|
1189 |
|
|
|
1190 |
@throw std::bad_alloc if allocation for array value fails
|
|
|
1191 |
|
|
|
1192 |
@liveexample{The following code shows the constructor with an @ref array_t
|
|
|
1193 |
parameter.,basic_json__array_t}
|
|
|
1194 |
|
|
|
1195 |
@sa @ref basic_json(const CompatibleArrayType&) -- create an array value
|
|
|
1196 |
from a compatible STL containers
|
|
|
1197 |
|
|
|
1198 |
@since version 1.0.0
|
|
|
1199 |
*/
|
|
|
1200 |
basic_json(const array_t& val)
|
|
|
1201 |
: m_type(value_t::array), m_value(val)
|
|
|
1202 |
{
|
|
|
1203 |
assert_invariant();
|
|
|
1204 |
}
|
|
|
1205 |
|
|
|
1206 |
/*!
|
|
|
1207 |
@brief create an array (implicit)
|
|
|
1208 |
|
|
|
1209 |
Create an array JSON value with a given content. This constructor allows
|
|
|
1210 |
any type @a CompatibleArrayType that can be used to construct values of
|
|
|
1211 |
type @ref array_t.
|
|
|
1212 |
|
|
|
1213 |
@tparam CompatibleArrayType An object type whose `value_type` is
|
|
|
1214 |
compatible to @ref array_t. Examples include `std::vector`, `std::deque`,
|
|
|
1215 |
`std::list`, `std::forward_list`, `std::array`, `std::set`,
|
|
|
1216 |
`std::unordered_set`, `std::multiset`, and `unordered_multiset` with a
|
|
|
1217 |
`value_type` from which a @ref basic_json value can be constructed.
|
|
|
1218 |
|
|
|
1219 |
@param[in] val a value for the array
|
|
|
1220 |
|
|
|
1221 |
@complexity Linear in the size of the passed @a val.
|
|
|
1222 |
|
|
|
1223 |
@throw std::bad_alloc if allocation for array value fails
|
|
|
1224 |
|
|
|
1225 |
@liveexample{The following code shows the constructor with several
|
|
|
1226 |
compatible array type parameters.,basic_json__CompatibleArrayType}
|
|
|
1227 |
|
|
|
1228 |
@sa @ref basic_json(const array_t&) -- create an array value
|
|
|
1229 |
|
|
|
1230 |
@since version 1.0.0
|
|
|
1231 |
*/
|
|
|
1232 |
template <class CompatibleArrayType, typename
|
|
|
1233 |
std::enable_if<
|
|
|
1234 |
not std::is_same<CompatibleArrayType, typename basic_json_t::iterator>::value and
|
|
|
1235 |
not std::is_same<CompatibleArrayType, typename basic_json_t::const_iterator>::value and
|
|
|
1236 |
not std::is_same<CompatibleArrayType, typename basic_json_t::reverse_iterator>::value and
|
|
|
1237 |
not std::is_same<CompatibleArrayType, typename basic_json_t::const_reverse_iterator>::value and
|
|
|
1238 |
not std::is_same<CompatibleArrayType, typename array_t::iterator>::value and
|
|
|
1239 |
not std::is_same<CompatibleArrayType, typename array_t::const_iterator>::value and
|
|
|
1240 |
std::is_constructible<basic_json, typename CompatibleArrayType::value_type>::value, int>::type
|
|
|
1241 |
= 0>
|
|
|
1242 |
basic_json(const CompatibleArrayType& val)
|
|
|
1243 |
: m_type(value_t::array)
|
|
|
1244 |
{
|
|
|
1245 |
using std::begin;
|
|
|
1246 |
using std::end;
|
|
|
1247 |
m_value.array = create<array_t>(begin(val), end(val));
|
|
|
1248 |
assert_invariant();
|
|
|
1249 |
}
|
|
|
1250 |
|
|
|
1251 |
/*!
|
|
|
1252 |
@brief create a string (explicit)
|
|
|
1253 |
|
|
|
1254 |
Create an string JSON value with a given content.
|
|
|
1255 |
|
|
|
1256 |
@param[in] val a value for the string
|
|
|
1257 |
|
|
|
1258 |
@complexity Linear in the size of the passed @a val.
|
|
|
1259 |
|
|
|
1260 |
@throw std::bad_alloc if allocation for string value fails
|
|
|
1261 |
|
|
|
1262 |
@liveexample{The following code shows the constructor with an @ref
|
|
|
1263 |
string_t parameter.,basic_json__string_t}
|
|
|
1264 |
|
|
|
1265 |
@sa @ref basic_json(const typename string_t::value_type*) -- create a
|
|
|
1266 |
string value from a character pointer
|
|
|
1267 |
@sa @ref basic_json(const CompatibleStringType&) -- create a string value
|
|
|
1268 |
from a compatible string container
|
|
|
1269 |
|
|
|
1270 |
@since version 1.0.0
|
|
|
1271 |
*/
|
|
|
1272 |
basic_json(const string_t& val)
|
|
|
1273 |
: m_type(value_t::string), m_value(val)
|
|
|
1274 |
{
|
|
|
1275 |
assert_invariant();
|
|
|
1276 |
}
|
|
|
1277 |
|
|
|
1278 |
/*!
|
|
|
1279 |
@brief create a string (explicit)
|
|
|
1280 |
|
|
|
1281 |
Create a string JSON value with a given content.
|
|
|
1282 |
|
|
|
1283 |
@param[in] val a literal value for the string
|
|
|
1284 |
|
|
|
1285 |
@complexity Linear in the size of the passed @a val.
|
|
|
1286 |
|
|
|
1287 |
@throw std::bad_alloc if allocation for string value fails
|
|
|
1288 |
|
|
|
1289 |
@liveexample{The following code shows the constructor with string literal
|
|
|
1290 |
parameter.,basic_json__string_t_value_type}
|
|
|
1291 |
|
|
|
1292 |
@sa @ref basic_json(const string_t&) -- create a string value
|
|
|
1293 |
@sa @ref basic_json(const CompatibleStringType&) -- create a string value
|
|
|
1294 |
from a compatible string container
|
|
|
1295 |
|
|
|
1296 |
@since version 1.0.0
|
|
|
1297 |
*/
|
|
|
1298 |
basic_json(const typename string_t::value_type* val)
|
|
|
1299 |
: basic_json(string_t(val))
|
|
|
1300 |
{
|
|
|
1301 |
assert_invariant();
|
|
|
1302 |
}
|
|
|
1303 |
|
|
|
1304 |
/*!
|
|
|
1305 |
@brief create a string (implicit)
|
|
|
1306 |
|
|
|
1307 |
Create a string JSON value with a given content.
|
|
|
1308 |
|
|
|
1309 |
@param[in] val a value for the string
|
|
|
1310 |
|
|
|
1311 |
@tparam CompatibleStringType an string type which is compatible to @ref
|
|
|
1312 |
string_t, for instance `std::string`.
|
|
|
1313 |
|
|
|
1314 |
@complexity Linear in the size of the passed @a val.
|
|
|
1315 |
|
|
|
1316 |
@throw std::bad_alloc if allocation for string value fails
|
|
|
1317 |
|
|
|
1318 |
@liveexample{The following code shows the construction of a string value
|
|
|
1319 |
from a compatible type.,basic_json__CompatibleStringType}
|
|
|
1320 |
|
|
|
1321 |
@sa @ref basic_json(const string_t&) -- create a string value
|
|
|
1322 |
@sa @ref basic_json(const typename string_t::value_type*) -- create a
|
|
|
1323 |
string value from a character pointer
|
|
|
1324 |
|
|
|
1325 |
@since version 1.0.0
|
|
|
1326 |
*/
|
|
|
1327 |
template <class CompatibleStringType, typename
|
|
|
1328 |
std::enable_if<
|
|
|
1329 |
std::is_constructible<string_t, CompatibleStringType>::value, int>::type
|
|
|
1330 |
= 0>
|
|
|
1331 |
basic_json(const CompatibleStringType& val)
|
|
|
1332 |
: basic_json(string_t(val))
|
|
|
1333 |
{
|
|
|
1334 |
assert_invariant();
|
|
|
1335 |
}
|
|
|
1336 |
|
|
|
1337 |
/*!
|
|
|
1338 |
@brief create a boolean (explicit)
|
|
|
1339 |
|
|
|
1340 |
Creates a JSON boolean type from a given value.
|
|
|
1341 |
|
|
|
1342 |
@param[in] val a boolean value to store
|
|
|
1343 |
|
|
|
1344 |
@complexity Constant.
|
|
|
1345 |
|
|
|
1346 |
@liveexample{The example below demonstrates boolean
|
|
|
1347 |
values.,basic_json__boolean_t}
|
|
|
1348 |
|
|
|
1349 |
@since version 1.0.0
|
|
|
1350 |
*/
|
|
|
1351 |
basic_json(boolean_t val) noexcept
|
|
|
1352 |
: m_type(value_t::boolean), m_value(val)
|
|
|
1353 |
{
|
|
|
1354 |
assert_invariant();
|
|
|
1355 |
}
|
|
|
1356 |
|
|
|
1357 |
/*!
|
|
|
1358 |
@brief create an integer number (explicit)
|
|
|
1359 |
|
|
|
1360 |
Create an integer number JSON value with a given content.
|
|
|
1361 |
|
|
|
1362 |
@tparam T A helper type to remove this function via SFINAE in case @ref
|
|
|
1363 |
number_integer_t is the same as `int`. In this case, this constructor
|
|
|
1364 |
would have the same signature as @ref basic_json(const int value). Note
|
|
|
1365 |
the helper type @a T is not visible in this constructor's interface.
|
|
|
1366 |
|
|
|
1367 |
@param[in] val an integer to create a JSON number from
|
|
|
1368 |
|
|
|
1369 |
@complexity Constant.
|
|
|
1370 |
|
|
|
1371 |
@liveexample{The example below shows the construction of an integer
|
|
|
1372 |
number value.,basic_json__number_integer_t}
|
|
|
1373 |
|
|
|
1374 |
@sa @ref basic_json(const int) -- create a number value (integer)
|
|
|
1375 |
@sa @ref basic_json(const CompatibleNumberIntegerType) -- create a number
|
|
|
1376 |
value (integer) from a compatible number type
|
|
|
1377 |
|
|
|
1378 |
@since version 1.0.0
|
|
|
1379 |
*/
|
|
|
1380 |
template<typename T,
|
|
|
1381 |
typename std::enable_if<
|
|
|
1382 |
not (std::is_same<T, int>::value)
|
|
|
1383 |
and std::is_same<T, number_integer_t>::value
|
|
|
1384 |
, int>::type
|
|
|
1385 |
= 0>
|
|
|
1386 |
basic_json(const number_integer_t val) noexcept
|
|
|
1387 |
: m_type(value_t::number_integer), m_value(val)
|
|
|
1388 |
{
|
|
|
1389 |
assert_invariant();
|
|
|
1390 |
}
|
|
|
1391 |
|
|
|
1392 |
/*!
|
|
|
1393 |
@brief create an integer number from an enum type (explicit)
|
|
|
1394 |
|
|
|
1395 |
Create an integer number JSON value with a given content.
|
|
|
1396 |
|
|
|
1397 |
@param[in] val an integer to create a JSON number from
|
|
|
1398 |
|
|
|
1399 |
@note This constructor allows to pass enums directly to a constructor. As
|
|
|
1400 |
C++ has no way of specifying the type of an anonymous enum explicitly, we
|
|
|
1401 |
can only rely on the fact that such values implicitly convert to int. As
|
|
|
1402 |
int may already be the same type of number_integer_t, we may need to
|
|
|
1403 |
switch off the constructor @ref basic_json(const number_integer_t).
|
|
|
1404 |
|
|
|
1405 |
@complexity Constant.
|
|
|
1406 |
|
|
|
1407 |
@liveexample{The example below shows the construction of an integer
|
|
|
1408 |
number value from an anonymous enum.,basic_json__const_int}
|
|
|
1409 |
|
|
|
1410 |
@sa @ref basic_json(const number_integer_t) -- create a number value
|
|
|
1411 |
(integer)
|
|
|
1412 |
@sa @ref basic_json(const CompatibleNumberIntegerType) -- create a number
|
|
|
1413 |
value (integer) from a compatible number type
|
|
|
1414 |
|
|
|
1415 |
@since version 1.0.0
|
|
|
1416 |
*/
|
|
|
1417 |
basic_json(const int val) noexcept
|
|
|
1418 |
: m_type(value_t::number_integer),
|
|
|
1419 |
m_value(static_cast<number_integer_t>(val))
|
|
|
1420 |
{
|
|
|
1421 |
assert_invariant();
|
|
|
1422 |
}
|
|
|
1423 |
|
|
|
1424 |
/*!
|
|
|
1425 |
@brief create an integer number (implicit)
|
|
|
1426 |
|
|
|
1427 |
Create an integer number JSON value with a given content. This constructor
|
|
|
1428 |
allows any type @a CompatibleNumberIntegerType that can be used to
|
|
|
1429 |
construct values of type @ref number_integer_t.
|
|
|
1430 |
|
|
|
1431 |
@tparam CompatibleNumberIntegerType An integer type which is compatible to
|
|
|
1432 |
@ref number_integer_t. Examples include the types `int`, `int32_t`,
|
|
|
1433 |
`long`, and `short`.
|
|
|
1434 |
|
|
|
1435 |
@param[in] val an integer to create a JSON number from
|
|
|
1436 |
|
|
|
1437 |
@complexity Constant.
|
|
|
1438 |
|
|
|
1439 |
@liveexample{The example below shows the construction of several integer
|
|
|
1440 |
number values from compatible
|
|
|
1441 |
types.,basic_json__CompatibleIntegerNumberType}
|
|
|
1442 |
|
|
|
1443 |
@sa @ref basic_json(const number_integer_t) -- create a number value
|
|
|
1444 |
(integer)
|
|
|
1445 |
@sa @ref basic_json(const int) -- create a number value (integer)
|
|
|
1446 |
|
|
|
1447 |
@since version 1.0.0
|
|
|
1448 |
*/
|
|
|
1449 |
template<typename CompatibleNumberIntegerType, typename
|
|
|
1450 |
std::enable_if<
|
|
|
1451 |
std::is_constructible<number_integer_t, CompatibleNumberIntegerType>::value and
|
|
|
1452 |
std::numeric_limits<CompatibleNumberIntegerType>::is_integer and
|
|
|
1453 |
std::numeric_limits<CompatibleNumberIntegerType>::is_signed,
|
|
|
1454 |
CompatibleNumberIntegerType>::type
|
|
|
1455 |
= 0>
|
|
|
1456 |
basic_json(const CompatibleNumberIntegerType val) noexcept
|
|
|
1457 |
: m_type(value_t::number_integer),
|
|
|
1458 |
m_value(static_cast<number_integer_t>(val))
|
|
|
1459 |
{
|
|
|
1460 |
assert_invariant();
|
|
|
1461 |
}
|
|
|
1462 |
|
|
|
1463 |
/*!
|
|
|
1464 |
@brief create an unsigned integer number (explicit)
|
|
|
1465 |
|
|
|
1466 |
Create an unsigned integer number JSON value with a given content.
|
|
|
1467 |
|
|
|
1468 |
@tparam T helper type to compare number_unsigned_t and unsigned int (not
|
|
|
1469 |
visible in) the interface.
|
|
|
1470 |
|
|
|
1471 |
@param[in] val an integer to create a JSON number from
|
|
|
1472 |
|
|
|
1473 |
@complexity Constant.
|
|
|
1474 |
|
|
|
1475 |
@sa @ref basic_json(const CompatibleNumberUnsignedType) -- create a number
|
|
|
1476 |
value (unsigned integer) from a compatible number type
|
|
|
1477 |
|
|
|
1478 |
@since version 2.0.0
|
|
|
1479 |
*/
|
|
|
1480 |
template<typename T,
|
|
|
1481 |
typename std::enable_if<
|
|
|
1482 |
not (std::is_same<T, int>::value)
|
|
|
1483 |
and std::is_same<T, number_unsigned_t>::value
|
|
|
1484 |
, int>::type
|
|
|
1485 |
= 0>
|
|
|
1486 |
basic_json(const number_unsigned_t val) noexcept
|
|
|
1487 |
: m_type(value_t::number_unsigned), m_value(val)
|
|
|
1488 |
{
|
|
|
1489 |
assert_invariant();
|
|
|
1490 |
}
|
|
|
1491 |
|
|
|
1492 |
/*!
|
|
|
1493 |
@brief create an unsigned number (implicit)
|
|
|
1494 |
|
|
|
1495 |
Create an unsigned number JSON value with a given content. This
|
|
|
1496 |
constructor allows any type @a CompatibleNumberUnsignedType that can be
|
|
|
1497 |
used to construct values of type @ref number_unsigned_t.
|
|
|
1498 |
|
|
|
1499 |
@tparam CompatibleNumberUnsignedType An integer type which is compatible
|
|
|
1500 |
to @ref number_unsigned_t. Examples may include the types `unsigned int`,
|
|
|
1501 |
`uint32_t`, or `unsigned short`.
|
|
|
1502 |
|
|
|
1503 |
@param[in] val an unsigned integer to create a JSON number from
|
|
|
1504 |
|
|
|
1505 |
@complexity Constant.
|
|
|
1506 |
|
|
|
1507 |
@sa @ref basic_json(const number_unsigned_t) -- create a number value
|
|
|
1508 |
(unsigned)
|
|
|
1509 |
|
|
|
1510 |
@since version 2.0.0
|
|
|
1511 |
*/
|
|
|
1512 |
template <typename CompatibleNumberUnsignedType, typename
|
|
|
1513 |
std::enable_if <
|
|
|
1514 |
std::is_constructible<number_unsigned_t, CompatibleNumberUnsignedType>::value and
|
|
|
1515 |
std::numeric_limits<CompatibleNumberUnsignedType>::is_integer and
|
|
|
1516 |
not std::numeric_limits<CompatibleNumberUnsignedType>::is_signed,
|
|
|
1517 |
CompatibleNumberUnsignedType>::type
|
|
|
1518 |
= 0>
|
|
|
1519 |
basic_json(const CompatibleNumberUnsignedType val) noexcept
|
|
|
1520 |
: m_type(value_t::number_unsigned),
|
|
|
1521 |
m_value(static_cast<number_unsigned_t>(val))
|
|
|
1522 |
{
|
|
|
1523 |
assert_invariant();
|
|
|
1524 |
}
|
|
|
1525 |
|
|
|
1526 |
/*!
|
|
|
1527 |
@brief create a floating-point number (explicit)
|
|
|
1528 |
|
|
|
1529 |
Create a floating-point number JSON value with a given content.
|
|
|
1530 |
|
|
|
1531 |
@param[in] val a floating-point value to create a JSON number from
|
|
|
1532 |
|
|
|
1533 |
@note [RFC 7159](http://www.rfc-editor.org/rfc/rfc7159.txt), section 6
|
|
|
1534 |
disallows NaN values:
|
|
|
1535 |
> Numeric values that cannot be represented in the grammar below (such as
|
|
|
1536 |
> Infinity and NaN) are not permitted.
|
|
|
1537 |
In case the parameter @a val is not a number, a JSON null value is created
|
|
|
1538 |
instead.
|
|
|
1539 |
|
|
|
1540 |
@complexity Constant.
|
|
|
1541 |
|
|
|
1542 |
@liveexample{The following example creates several floating-point
|
|
|
1543 |
values.,basic_json__number_float_t}
|
|
|
1544 |
|
|
|
1545 |
@sa @ref basic_json(const CompatibleNumberFloatType) -- create a number
|
|
|
1546 |
value (floating-point) from a compatible number type
|
|
|
1547 |
|
|
|
1548 |
@since version 1.0.0
|
|
|
1549 |
*/
|
|
|
1550 |
basic_json(const number_float_t val) noexcept
|
|
|
1551 |
: m_type(value_t::number_float), m_value(val)
|
|
|
1552 |
{
|
|
|
1553 |
// replace infinity and NAN by null
|
|
|
1554 |
if (not std::isfinite(val))
|
|
|
1555 |
{
|
|
|
1556 |
m_type = value_t::null;
|
|
|
1557 |
m_value = json_value();
|
|
|
1558 |
}
|
|
|
1559 |
|
|
|
1560 |
assert_invariant();
|
|
|
1561 |
}
|
|
|
1562 |
|
|
|
1563 |
/*!
|
|
|
1564 |
@brief create an floating-point number (implicit)
|
|
|
1565 |
|
|
|
1566 |
Create an floating-point number JSON value with a given content. This
|
|
|
1567 |
constructor allows any type @a CompatibleNumberFloatType that can be used
|
|
|
1568 |
to construct values of type @ref number_float_t.
|
|
|
1569 |
|
|
|
1570 |
@tparam CompatibleNumberFloatType A floating-point type which is
|
|
|
1571 |
compatible to @ref number_float_t. Examples may include the types `float`
|
|
|
1572 |
or `double`.
|
|
|
1573 |
|
|
|
1574 |
@param[in] val a floating-point to create a JSON number from
|
|
|
1575 |
|
|
|
1576 |
@note [RFC 7159](http://www.rfc-editor.org/rfc/rfc7159.txt), section 6
|
|
|
1577 |
disallows NaN values:
|
|
|
1578 |
> Numeric values that cannot be represented in the grammar below (such as
|
|
|
1579 |
> Infinity and NaN) are not permitted.
|
|
|
1580 |
In case the parameter @a val is not a number, a JSON null value is
|
|
|
1581 |
created instead.
|
|
|
1582 |
|
|
|
1583 |
@complexity Constant.
|
|
|
1584 |
|
|
|
1585 |
@liveexample{The example below shows the construction of several
|
|
|
1586 |
floating-point number values from compatible
|
|
|
1587 |
types.,basic_json__CompatibleNumberFloatType}
|
|
|
1588 |
|
|
|
1589 |
@sa @ref basic_json(const number_float_t) -- create a number value
|
|
|
1590 |
(floating-point)
|
|
|
1591 |
|
|
|
1592 |
@since version 1.0.0
|
|
|
1593 |
*/
|
|
|
1594 |
template<typename CompatibleNumberFloatType, typename = typename
|
|
|
1595 |
std::enable_if<
|
|
|
1596 |
std::is_constructible<number_float_t, CompatibleNumberFloatType>::value and
|
|
|
1597 |
std::is_floating_point<CompatibleNumberFloatType>::value>::type
|
|
|
1598 |
>
|
|
|
1599 |
basic_json(const CompatibleNumberFloatType val) noexcept
|
|
|
1600 |
: basic_json(number_float_t(val))
|
|
|
1601 |
{
|
|
|
1602 |
assert_invariant();
|
|
|
1603 |
}
|
|
|
1604 |
|
|
|
1605 |
/*!
|
|
|
1606 |
@brief create a container (array or object) from an initializer list
|
|
|
1607 |
|
|
|
1608 |
Creates a JSON value of type array or object from the passed initializer
|
|
|
1609 |
list @a init. In case @a type_deduction is `true` (default), the type of
|
|
|
1610 |
the JSON value to be created is deducted from the initializer list @a init
|
|
|
1611 |
according to the following rules:
|
|
|
1612 |
|
|
|
1613 |
1. If the list is empty, an empty JSON object value `{}` is created.
|
|
|
1614 |
2. If the list consists of pairs whose first element is a string, a JSON
|
|
|
1615 |
object value is created where the first elements of the pairs are
|
|
|
1616 |
treated as keys and the second elements are as values.
|
|
|
1617 |
3. In all other cases, an array is created.
|
|
|
1618 |
|
|
|
1619 |
The rules aim to create the best fit between a C++ initializer list and
|
|
|
1620 |
JSON values. The rationale is as follows:
|
|
|
1621 |
|
|
|
1622 |
1. The empty initializer list is written as `{}` which is exactly an empty
|
|
|
1623 |
JSON object.
|
|
|
1624 |
2. C++ has now way of describing mapped types other than to list a list of
|
|
|
1625 |
pairs. As JSON requires that keys must be of type string, rule 2 is the
|
|
|
1626 |
weakest constraint one can pose on initializer lists to interpret them
|
|
|
1627 |
as an object.
|
|
|
1628 |
3. In all other cases, the initializer list could not be interpreted as
|
|
|
1629 |
JSON object type, so interpreting it as JSON array type is safe.
|
|
|
1630 |
|
|
|
1631 |
With the rules described above, the following JSON values cannot be
|
|
|
1632 |
expressed by an initializer list:
|
|
|
1633 |
|
|
|
1634 |
- the empty array (`[]`): use @ref array(std::initializer_list<basic_json>)
|
|
|
1635 |
with an empty initializer list in this case
|
|
|
1636 |
- arrays whose elements satisfy rule 2: use @ref
|
|
|
1637 |
array(std::initializer_list<basic_json>) with the same initializer list
|
|
|
1638 |
in this case
|
|
|
1639 |
|
|
|
1640 |
@note When used without parentheses around an empty initializer list, @ref
|
|
|
1641 |
basic_json() is called instead of this function, yielding the JSON null
|
|
|
1642 |
value.
|
|
|
1643 |
|
|
|
1644 |
@param[in] init initializer list with JSON values
|
|
|
1645 |
|
|
|
1646 |
@param[in] type_deduction internal parameter; when set to `true`, the type
|
|
|
1647 |
of the JSON value is deducted from the initializer list @a init; when set
|
|
|
1648 |
to `false`, the type provided via @a manual_type is forced. This mode is
|
|
|
1649 |
used by the functions @ref array(std::initializer_list<basic_json>) and
|
|
|
1650 |
@ref object(std::initializer_list<basic_json>).
|
|
|
1651 |
|
|
|
1652 |
@param[in] manual_type internal parameter; when @a type_deduction is set
|
|
|
1653 |
to `false`, the created JSON value will use the provided type (only @ref
|
|
|
1654 |
value_t::array and @ref value_t::object are valid); when @a type_deduction
|
|
|
1655 |
is set to `true`, this parameter has no effect
|
|
|
1656 |
|
|
|
1657 |
@throw std::domain_error if @a type_deduction is `false`, @a manual_type
|
|
|
1658 |
is `value_t::object`, but @a init contains an element which is not a pair
|
|
|
1659 |
whose first element is a string; example: `"cannot create object from
|
|
|
1660 |
initializer list"`
|
|
|
1661 |
|
|
|
1662 |
@complexity Linear in the size of the initializer list @a init.
|
|
|
1663 |
|
|
|
1664 |
@liveexample{The example below shows how JSON values are created from
|
|
|
1665 |
initializer lists.,basic_json__list_init_t}
|
|
|
1666 |
|
|
|
1667 |
@sa @ref array(std::initializer_list<basic_json>) -- create a JSON array
|
|
|
1668 |
value from an initializer list
|
|
|
1669 |
@sa @ref object(std::initializer_list<basic_json>) -- create a JSON object
|
|
|
1670 |
value from an initializer list
|
|
|
1671 |
|
|
|
1672 |
@since version 1.0.0
|
|
|
1673 |
*/
|
|
|
1674 |
basic_json(std::initializer_list<basic_json> init,
|
|
|
1675 |
bool type_deduction = true,
|
|
|
1676 |
value_t manual_type = value_t::array)
|
|
|
1677 |
{
|
|
|
1678 |
// check if each element is an array with two elements whose first
|
|
|
1679 |
// element is a string
|
|
|
1680 |
bool is_an_object = std::all_of(init.begin(), init.end(),
|
|
|
1681 |
[](const basic_json & element)
|
|
|
1682 |
{
|
|
|
1683 |
return element.is_array() and element.size() == 2 and element[0].is_string();
|
|
|
1684 |
});
|
|
|
1685 |
|
|
|
1686 |
// adjust type if type deduction is not wanted
|
|
|
1687 |
if (not type_deduction)
|
|
|
1688 |
{
|
|
|
1689 |
// if array is wanted, do not create an object though possible
|
|
|
1690 |
if (manual_type == value_t::array)
|
|
|
1691 |
{
|
|
|
1692 |
is_an_object = false;
|
|
|
1693 |
}
|
|
|
1694 |
|
|
|
1695 |
// if object is wanted but impossible, throw an exception
|
|
|
1696 |
if (manual_type == value_t::object and not is_an_object)
|
|
|
1697 |
{
|
|
|
1698 |
throw std::domain_error("cannot create object from initializer list");
|
|
|
1699 |
}
|
|
|
1700 |
}
|
|
|
1701 |
|
|
|
1702 |
if (is_an_object)
|
|
|
1703 |
{
|
|
|
1704 |
// the initializer list is a list of pairs -> create object
|
|
|
1705 |
m_type = value_t::object;
|
|
|
1706 |
m_value = value_t::object;
|
|
|
1707 |
|
|
|
1708 |
std::for_each(init.begin(), init.end(), [this](const basic_json & element)
|
|
|
1709 |
{
|
|
|
1710 |
m_value.object->emplace(*(element[0].m_value.string), element[1]);
|
|
|
1711 |
});
|
|
|
1712 |
}
|
|
|
1713 |
else
|
|
|
1714 |
{
|
|
|
1715 |
// the initializer list describes an array -> create array
|
|
|
1716 |
m_type = value_t::array;
|
|
|
1717 |
m_value.array = create<array_t>(init);
|
|
|
1718 |
}
|
|
|
1719 |
|
|
|
1720 |
assert_invariant();
|
|
|
1721 |
}
|
|
|
1722 |
|
|
|
1723 |
/*!
|
|
|
1724 |
@brief explicitly create an array from an initializer list
|
|
|
1725 |
|
|
|
1726 |
Creates a JSON array value from a given initializer list. That is, given a
|
|
|
1727 |
list of values `a, b, c`, creates the JSON value `[a, b, c]`. If the
|
|
|
1728 |
initializer list is empty, the empty array `[]` is created.
|
|
|
1729 |
|
|
|
1730 |
@note This function is only needed to express two edge cases that cannot
|
|
|
1731 |
be realized with the initializer list constructor (@ref
|
|
|
1732 |
basic_json(std::initializer_list<basic_json>, bool, value_t)). These cases
|
|
|
1733 |
are:
|
|
|
1734 |
1. creating an array whose elements are all pairs whose first element is a
|
|
|
1735 |
string -- in this case, the initializer list constructor would create an
|
|
|
1736 |
object, taking the first elements as keys
|
|
|
1737 |
2. creating an empty array -- passing the empty initializer list to the
|
|
|
1738 |
initializer list constructor yields an empty object
|
|
|
1739 |
|
|
|
1740 |
@param[in] init initializer list with JSON values to create an array from
|
|
|
1741 |
(optional)
|
|
|
1742 |
|
|
|
1743 |
@return JSON array value
|
|
|
1744 |
|
|
|
1745 |
@complexity Linear in the size of @a init.
|
|
|
1746 |
|
|
|
1747 |
@liveexample{The following code shows an example for the `array`
|
|
|
1748 |
function.,array}
|
|
|
1749 |
|
|
|
1750 |
@sa @ref basic_json(std::initializer_list<basic_json>, bool, value_t) --
|
|
|
1751 |
create a JSON value from an initializer list
|
|
|
1752 |
@sa @ref object(std::initializer_list<basic_json>) -- create a JSON object
|
|
|
1753 |
value from an initializer list
|
|
|
1754 |
|
|
|
1755 |
@since version 1.0.0
|
|
|
1756 |
*/
|
|
|
1757 |
static basic_json array(std::initializer_list<basic_json> init =
|
|
|
1758 |
std::initializer_list<basic_json>())
|
|
|
1759 |
{
|
|
|
1760 |
return basic_json(init, false, value_t::array);
|
|
|
1761 |
}
|
|
|
1762 |
|
|
|
1763 |
/*!
|
|
|
1764 |
@brief explicitly create an object from an initializer list
|
|
|
1765 |
|
|
|
1766 |
Creates a JSON object value from a given initializer list. The initializer
|
|
|
1767 |
lists elements must be pairs, and their first elements must be strings. If
|
|
|
1768 |
the initializer list is empty, the empty object `{}` is created.
|
|
|
1769 |
|
|
|
1770 |
@note This function is only added for symmetry reasons. In contrast to the
|
|
|
1771 |
related function @ref array(std::initializer_list<basic_json>), there are
|
|
|
1772 |
no cases which can only be expressed by this function. That is, any
|
|
|
1773 |
initializer list @a init can also be passed to the initializer list
|
|
|
1774 |
constructor @ref basic_json(std::initializer_list<basic_json>, bool,
|
|
|
1775 |
value_t).
|
|
|
1776 |
|
|
|
1777 |
@param[in] init initializer list to create an object from (optional)
|
|
|
1778 |
|
|
|
1779 |
@return JSON object value
|
|
|
1780 |
|
|
|
1781 |
@throw std::domain_error if @a init is not a pair whose first elements are
|
|
|
1782 |
strings; thrown by
|
|
|
1783 |
@ref basic_json(std::initializer_list<basic_json>, bool, value_t)
|
|
|
1784 |
|
|
|
1785 |
@complexity Linear in the size of @a init.
|
|
|
1786 |
|
|
|
1787 |
@liveexample{The following code shows an example for the `object`
|
|
|
1788 |
function.,object}
|
|
|
1789 |
|
|
|
1790 |
@sa @ref basic_json(std::initializer_list<basic_json>, bool, value_t) --
|
|
|
1791 |
create a JSON value from an initializer list
|
|
|
1792 |
@sa @ref array(std::initializer_list<basic_json>) -- create a JSON array
|
|
|
1793 |
value from an initializer list
|
|
|
1794 |
|
|
|
1795 |
@since version 1.0.0
|
|
|
1796 |
*/
|
|
|
1797 |
static basic_json object(std::initializer_list<basic_json> init =
|
|
|
1798 |
std::initializer_list<basic_json>())
|
|
|
1799 |
{
|
|
|
1800 |
return basic_json(init, false, value_t::object);
|
|
|
1801 |
}
|
|
|
1802 |
|
|
|
1803 |
/*!
|
|
|
1804 |
@brief construct an array with count copies of given value
|
|
|
1805 |
|
|
|
1806 |
Constructs a JSON array value by creating @a cnt copies of a passed value.
|
|
|
1807 |
In case @a cnt is `0`, an empty array is created. As postcondition,
|
|
|
1808 |
`std::distance(begin(),end()) == cnt` holds.
|
|
|
1809 |
|
|
|
1810 |
@param[in] cnt the number of JSON copies of @a val to create
|
|
|
1811 |
@param[in] val the JSON value to copy
|
|
|
1812 |
|
|
|
1813 |
@complexity Linear in @a cnt.
|
|
|
1814 |
|
|
|
1815 |
@liveexample{The following code shows examples for the @ref
|
|
|
1816 |
basic_json(size_type\, const basic_json&)
|
|
|
1817 |
constructor.,basic_json__size_type_basic_json}
|
|
|
1818 |
|
|
|
1819 |
@since version 1.0.0
|
|
|
1820 |
*/
|
|
|
1821 |
basic_json(size_type cnt, const basic_json& val)
|
|
|
1822 |
: m_type(value_t::array)
|
|
|
1823 |
{
|
|
|
1824 |
m_value.array = create<array_t>(cnt, val);
|
|
|
1825 |
assert_invariant();
|
|
|
1826 |
}
|
|
|
1827 |
|
|
|
1828 |
/*!
|
|
|
1829 |
@brief construct a JSON container given an iterator range
|
|
|
1830 |
|
|
|
1831 |
Constructs the JSON value with the contents of the range `[first, last)`.
|
|
|
1832 |
The semantics depends on the different types a JSON value can have:
|
|
|
1833 |
- In case of primitive types (number, boolean, or string), @a first must
|
|
|
1834 |
be `begin()` and @a last must be `end()`. In this case, the value is
|
|
|
1835 |
copied. Otherwise, std::out_of_range is thrown.
|
|
|
1836 |
- In case of structured types (array, object), the constructor behaves as
|
|
|
1837 |
similar versions for `std::vector`.
|
|
|
1838 |
- In case of a null type, std::domain_error is thrown.
|
|
|
1839 |
|
|
|
1840 |
@tparam InputIT an input iterator type (@ref iterator or @ref
|
|
|
1841 |
const_iterator)
|
|
|
1842 |
|
|
|
1843 |
@param[in] first begin of the range to copy from (included)
|
|
|
1844 |
@param[in] last end of the range to copy from (excluded)
|
|
|
1845 |
|
|
|
1846 |
@pre Iterators @a first and @a last must be initialized.
|
|
|
1847 |
|
|
|
1848 |
@throw std::domain_error if iterators are not compatible; that is, do not
|
|
|
1849 |
belong to the same JSON value; example: `"iterators are not compatible"`
|
|
|
1850 |
@throw std::out_of_range if iterators are for a primitive type (number,
|
|
|
1851 |
boolean, or string) where an out of range error can be detected easily;
|
|
|
1852 |
example: `"iterators out of range"`
|
|
|
1853 |
@throw std::bad_alloc if allocation for object, array, or string fails
|
|
|
1854 |
@throw std::domain_error if called with a null value; example: `"cannot
|
|
|
1855 |
use construct with iterators from null"`
|
|
|
1856 |
|
|
|
1857 |
@complexity Linear in distance between @a first and @a last.
|
|
|
1858 |
|
|
|
1859 |
@liveexample{The example below shows several ways to create JSON values by
|
|
|
1860 |
specifying a subrange with iterators.,basic_json__InputIt_InputIt}
|
|
|
1861 |
|
|
|
1862 |
@since version 1.0.0
|
|
|
1863 |
*/
|
|
|
1864 |
template <class InputIT, typename
|
|
|
1865 |
std::enable_if<
|
|
|
1866 |
std::is_same<InputIT, typename basic_json_t::iterator>::value or
|
|
|
1867 |
std::is_same<InputIT, typename basic_json_t::const_iterator>::value
|
|
|
1868 |
, int>::type
|
|
|
1869 |
= 0>
|
|
|
1870 |
basic_json(InputIT first, InputIT last)
|
|
|
1871 |
{
|
|
|
1872 |
assert(first.m_object != nullptr);
|
|
|
1873 |
assert(last.m_object != nullptr);
|
|
|
1874 |
|
|
|
1875 |
// make sure iterator fits the current value
|
|
|
1876 |
if (first.m_object != last.m_object)
|
|
|
1877 |
{
|
|
|
1878 |
throw std::domain_error("iterators are not compatible");
|
|
|
1879 |
}
|
|
|
1880 |
|
|
|
1881 |
// copy type from first iterator
|
|
|
1882 |
m_type = first.m_object->m_type;
|
|
|
1883 |
|
|
|
1884 |
// check if iterator range is complete for primitive values
|
|
|
1885 |
switch (m_type)
|
|
|
1886 |
{
|
|
|
1887 |
case value_t::boolean:
|
|
|
1888 |
case value_t::number_float:
|
|
|
1889 |
case value_t::number_integer:
|
|
|
1890 |
case value_t::number_unsigned:
|
|
|
1891 |
case value_t::string:
|
|
|
1892 |
{
|
|
|
1893 |
if (not first.m_it.primitive_iterator.is_begin() or not last.m_it.primitive_iterator.is_end())
|
|
|
1894 |
{
|
|
|
1895 |
throw std::out_of_range("iterators out of range");
|
|
|
1896 |
}
|
|
|
1897 |
break;
|
|
|
1898 |
}
|
|
|
1899 |
|
|
|
1900 |
default:
|
|
|
1901 |
{
|
|
|
1902 |
break;
|
|
|
1903 |
}
|
|
|
1904 |
}
|
|
|
1905 |
|
|
|
1906 |
switch (m_type)
|
|
|
1907 |
{
|
|
|
1908 |
case value_t::number_integer:
|
|
|
1909 |
{
|
|
|
1910 |
m_value.number_integer = first.m_object->m_value.number_integer;
|
|
|
1911 |
break;
|
|
|
1912 |
}
|
|
|
1913 |
|
|
|
1914 |
case value_t::number_unsigned:
|
|
|
1915 |
{
|
|
|
1916 |
m_value.number_unsigned = first.m_object->m_value.number_unsigned;
|
|
|
1917 |
break;
|
|
|
1918 |
}
|
|
|
1919 |
|
|
|
1920 |
case value_t::number_float:
|
|
|
1921 |
{
|
|
|
1922 |
m_value.number_float = first.m_object->m_value.number_float;
|
|
|
1923 |
break;
|
|
|
1924 |
}
|
|
|
1925 |
|
|
|
1926 |
case value_t::boolean:
|
|
|
1927 |
{
|
|
|
1928 |
m_value.boolean = first.m_object->m_value.boolean;
|
|
|
1929 |
break;
|
|
|
1930 |
}
|
|
|
1931 |
|
|
|
1932 |
case value_t::string:
|
|
|
1933 |
{
|
|
|
1934 |
m_value = *first.m_object->m_value.string;
|
|
|
1935 |
break;
|
|
|
1936 |
}
|
|
|
1937 |
|
|
|
1938 |
case value_t::object:
|
|
|
1939 |
{
|
|
|
1940 |
m_value.object = create<object_t>(first.m_it.object_iterator, last.m_it.object_iterator);
|
|
|
1941 |
break;
|
|
|
1942 |
}
|
|
|
1943 |
|
|
|
1944 |
case value_t::array:
|
|
|
1945 |
{
|
|
|
1946 |
m_value.array = create<array_t>(first.m_it.array_iterator, last.m_it.array_iterator);
|
|
|
1947 |
break;
|
|
|
1948 |
}
|
|
|
1949 |
|
|
|
1950 |
default:
|
|
|
1951 |
{
|
|
|
1952 |
throw std::domain_error("cannot use construct with iterators from " + first.m_object->type_name());
|
|
|
1953 |
}
|
|
|
1954 |
}
|
|
|
1955 |
|
|
|
1956 |
assert_invariant();
|
|
|
1957 |
}
|
|
|
1958 |
|
|
|
1959 |
/*!
|
|
|
1960 |
@brief construct a JSON value given an input stream
|
|
|
1961 |
|
|
|
1962 |
@param[in,out] i stream to read a serialized JSON value from
|
|
|
1963 |
@param[in] cb a parser callback function of type @ref parser_callback_t
|
|
|
1964 |
which is used to control the deserialization by filtering unwanted values
|
|
|
1965 |
(optional)
|
|
|
1966 |
|
|
|
1967 |
@complexity Linear in the length of the input. The parser is a predictive
|
|
|
1968 |
LL(1) parser. The complexity can be higher if the parser callback function
|
|
|
1969 |
@a cb has a super-linear complexity.
|
|
|
1970 |
|
|
|
1971 |
@note A UTF-8 byte order mark is silently ignored.
|
|
|
1972 |
|
|
|
1973 |
@liveexample{The example below demonstrates constructing a JSON value from
|
|
|
1974 |
a `std::stringstream` with and without callback
|
|
|
1975 |
function.,basic_json__istream}
|
|
|
1976 |
|
|
|
1977 |
@since version 2.0.0
|
|
|
1978 |
*/
|
|
|
1979 |
explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr)
|
|
|
1980 |
{
|
|
|
1981 |
*this = parser(i, cb).parse();
|
|
|
1982 |
assert_invariant();
|
|
|
1983 |
}
|
|
|
1984 |
|
|
|
1985 |
///////////////////////////////////////
|
|
|
1986 |
// other constructors and destructor //
|
|
|
1987 |
///////////////////////////////////////
|
|
|
1988 |
|
|
|
1989 |
/*!
|
|
|
1990 |
@brief copy constructor
|
|
|
1991 |
|
|
|
1992 |
Creates a copy of a given JSON value.
|
|
|
1993 |
|
|
|
1994 |
@param[in] other the JSON value to copy
|
|
|
1995 |
|
|
|
1996 |
@complexity Linear in the size of @a other.
|
|
|
1997 |
|
|
|
1998 |
@requirement This function helps `basic_json` satisfying the
|
|
|
1999 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
2000 |
requirements:
|
|
|
2001 |
- The complexity is linear.
|
|
|
2002 |
- As postcondition, it holds: `other == basic_json(other)`.
|
|
|
2003 |
|
|
|
2004 |
@throw std::bad_alloc if allocation for object, array, or string fails.
|
|
|
2005 |
|
|
|
2006 |
@liveexample{The following code shows an example for the copy
|
|
|
2007 |
constructor.,basic_json__basic_json}
|
|
|
2008 |
|
|
|
2009 |
@since version 1.0.0
|
|
|
2010 |
*/
|
|
|
2011 |
basic_json(const basic_json& other)
|
|
|
2012 |
: m_type(other.m_type)
|
|
|
2013 |
{
|
|
|
2014 |
// check of passed value is valid
|
|
|
2015 |
other.assert_invariant();
|
|
|
2016 |
|
|
|
2017 |
switch (m_type)
|
|
|
2018 |
{
|
|
|
2019 |
case value_t::object:
|
|
|
2020 |
{
|
|
|
2021 |
m_value = *other.m_value.object;
|
|
|
2022 |
break;
|
|
|
2023 |
}
|
|
|
2024 |
|
|
|
2025 |
case value_t::array:
|
|
|
2026 |
{
|
|
|
2027 |
m_value = *other.m_value.array;
|
|
|
2028 |
break;
|
|
|
2029 |
}
|
|
|
2030 |
|
|
|
2031 |
case value_t::string:
|
|
|
2032 |
{
|
|
|
2033 |
m_value = *other.m_value.string;
|
|
|
2034 |
break;
|
|
|
2035 |
}
|
|
|
2036 |
|
|
|
2037 |
case value_t::boolean:
|
|
|
2038 |
{
|
|
|
2039 |
m_value = other.m_value.boolean;
|
|
|
2040 |
break;
|
|
|
2041 |
}
|
|
|
2042 |
|
|
|
2043 |
case value_t::number_integer:
|
|
|
2044 |
{
|
|
|
2045 |
m_value = other.m_value.number_integer;
|
|
|
2046 |
break;
|
|
|
2047 |
}
|
|
|
2048 |
|
|
|
2049 |
case value_t::number_unsigned:
|
|
|
2050 |
{
|
|
|
2051 |
m_value = other.m_value.number_unsigned;
|
|
|
2052 |
break;
|
|
|
2053 |
}
|
|
|
2054 |
|
|
|
2055 |
case value_t::number_float:
|
|
|
2056 |
{
|
|
|
2057 |
m_value = other.m_value.number_float;
|
|
|
2058 |
break;
|
|
|
2059 |
}
|
|
|
2060 |
|
|
|
2061 |
default:
|
|
|
2062 |
{
|
|
|
2063 |
break;
|
|
|
2064 |
}
|
|
|
2065 |
}
|
|
|
2066 |
|
|
|
2067 |
assert_invariant();
|
|
|
2068 |
}
|
|
|
2069 |
|
|
|
2070 |
/*!
|
|
|
2071 |
@brief move constructor
|
|
|
2072 |
|
|
|
2073 |
Move constructor. Constructs a JSON value with the contents of the given
|
|
|
2074 |
value @a other using move semantics. It "steals" the resources from @a
|
|
|
2075 |
other and leaves it as JSON null value.
|
|
|
2076 |
|
|
|
2077 |
@param[in,out] other value to move to this object
|
|
|
2078 |
|
|
|
2079 |
@post @a other is a JSON null value
|
|
|
2080 |
|
|
|
2081 |
@complexity Constant.
|
|
|
2082 |
|
|
|
2083 |
@liveexample{The code below shows the move constructor explicitly called
|
|
|
2084 |
via std::move.,basic_json__moveconstructor}
|
|
|
2085 |
|
|
|
2086 |
@since version 1.0.0
|
|
|
2087 |
*/
|
|
|
2088 |
basic_json(basic_json&& other) noexcept
|
|
|
2089 |
: m_type(std::move(other.m_type)),
|
|
|
2090 |
m_value(std::move(other.m_value))
|
|
|
2091 |
{
|
|
|
2092 |
// check that passed value is valid
|
|
|
2093 |
other.assert_invariant();
|
|
|
2094 |
|
|
|
2095 |
// invalidate payload
|
|
|
2096 |
other.m_type = value_t::null;
|
|
|
2097 |
other.m_value = {};
|
|
|
2098 |
|
|
|
2099 |
assert_invariant();
|
|
|
2100 |
}
|
|
|
2101 |
|
|
|
2102 |
/*!
|
|
|
2103 |
@brief copy assignment
|
|
|
2104 |
|
|
|
2105 |
Copy assignment operator. Copies a JSON value via the "copy and swap"
|
|
|
2106 |
strategy: It is expressed in terms of the copy constructor, destructor,
|
|
|
2107 |
and the swap() member function.
|
|
|
2108 |
|
|
|
2109 |
@param[in] other value to copy from
|
|
|
2110 |
|
|
|
2111 |
@complexity Linear.
|
|
|
2112 |
|
|
|
2113 |
@requirement This function helps `basic_json` satisfying the
|
|
|
2114 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
2115 |
requirements:
|
|
|
2116 |
- The complexity is linear.
|
|
|
2117 |
|
|
|
2118 |
@liveexample{The code below shows and example for the copy assignment. It
|
|
|
2119 |
creates a copy of value `a` which is then swapped with `b`. Finally\, the
|
|
|
2120 |
copy of `a` (which is the null value after the swap) is
|
|
|
2121 |
destroyed.,basic_json__copyassignment}
|
|
|
2122 |
|
|
|
2123 |
@since version 1.0.0
|
|
|
2124 |
*/
|
|
|
2125 |
reference& operator=(basic_json other) noexcept (
|
|
|
2126 |
std::is_nothrow_move_constructible<value_t>::value and
|
|
|
2127 |
std::is_nothrow_move_assignable<value_t>::value and
|
|
|
2128 |
std::is_nothrow_move_constructible<json_value>::value and
|
|
|
2129 |
std::is_nothrow_move_assignable<json_value>::value
|
|
|
2130 |
)
|
|
|
2131 |
{
|
|
|
2132 |
// check that passed value is valid
|
|
|
2133 |
other.assert_invariant();
|
|
|
2134 |
|
|
|
2135 |
using std::swap;
|
|
|
2136 |
swap(m_type, other.m_type);
|
|
|
2137 |
swap(m_value, other.m_value);
|
|
|
2138 |
|
|
|
2139 |
assert_invariant();
|
|
|
2140 |
return *this;
|
|
|
2141 |
}
|
|
|
2142 |
|
|
|
2143 |
/*!
|
|
|
2144 |
@brief destructor
|
|
|
2145 |
|
|
|
2146 |
Destroys the JSON value and frees all allocated memory.
|
|
|
2147 |
|
|
|
2148 |
@complexity Linear.
|
|
|
2149 |
|
|
|
2150 |
@requirement This function helps `basic_json` satisfying the
|
|
|
2151 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
2152 |
requirements:
|
|
|
2153 |
- The complexity is linear.
|
|
|
2154 |
- All stored elements are destroyed and all memory is freed.
|
|
|
2155 |
|
|
|
2156 |
@since version 1.0.0
|
|
|
2157 |
*/
|
|
|
2158 |
~basic_json()
|
|
|
2159 |
{
|
|
|
2160 |
assert_invariant();
|
|
|
2161 |
|
|
|
2162 |
switch (m_type)
|
|
|
2163 |
{
|
|
|
2164 |
case value_t::object:
|
|
|
2165 |
{
|
|
|
2166 |
AllocatorType<object_t> alloc;
|
|
|
2167 |
alloc.destroy(m_value.object);
|
|
|
2168 |
alloc.deallocate(m_value.object, 1);
|
|
|
2169 |
break;
|
|
|
2170 |
}
|
|
|
2171 |
|
|
|
2172 |
case value_t::array:
|
|
|
2173 |
{
|
|
|
2174 |
AllocatorType<array_t> alloc;
|
|
|
2175 |
alloc.destroy(m_value.array);
|
|
|
2176 |
alloc.deallocate(m_value.array, 1);
|
|
|
2177 |
break;
|
|
|
2178 |
}
|
|
|
2179 |
|
|
|
2180 |
case value_t::string:
|
|
|
2181 |
{
|
|
|
2182 |
AllocatorType<string_t> alloc;
|
|
|
2183 |
alloc.destroy(m_value.string);
|
|
|
2184 |
alloc.deallocate(m_value.string, 1);
|
|
|
2185 |
break;
|
|
|
2186 |
}
|
|
|
2187 |
|
|
|
2188 |
default:
|
|
|
2189 |
{
|
|
|
2190 |
// all other types need no specific destructor
|
|
|
2191 |
break;
|
|
|
2192 |
}
|
|
|
2193 |
}
|
|
|
2194 |
}
|
|
|
2195 |
|
|
|
2196 |
/// @}
|
|
|
2197 |
|
|
|
2198 |
public:
|
|
|
2199 |
///////////////////////
|
|
|
2200 |
// object inspection //
|
|
|
2201 |
///////////////////////
|
|
|
2202 |
|
|
|
2203 |
/// @name object inspection
|
|
|
2204 |
/// Functions to inspect the type of a JSON value.
|
|
|
2205 |
/// @{
|
|
|
2206 |
|
|
|
2207 |
/*!
|
|
|
2208 |
@brief serialization
|
|
|
2209 |
|
|
|
2210 |
Serialization function for JSON values. The function tries to mimic
|
|
|
2211 |
Python's `json.dumps()` function, and currently supports its @a indent
|
|
|
2212 |
parameter.
|
|
|
2213 |
|
|
|
2214 |
@param[in] indent If indent is nonnegative, then array elements and object
|
|
|
2215 |
members will be pretty-printed with that indent level. An indent level of
|
|
|
2216 |
`0` will only insert newlines. `-1` (the default) selects the most compact
|
|
|
2217 |
representation.
|
|
|
2218 |
|
|
|
2219 |
@return string containing the serialization of the JSON value
|
|
|
2220 |
|
|
|
2221 |
@complexity Linear.
|
|
|
2222 |
|
|
|
2223 |
@liveexample{The following example shows the effect of different @a indent
|
|
|
2224 |
parameters to the result of the serialization.,dump}
|
|
|
2225 |
|
|
|
2226 |
@see https://docs.python.org/2/library/json.html#json.dump
|
|
|
2227 |
|
|
|
2228 |
@since version 1.0.0
|
|
|
2229 |
*/
|
|
|
2230 |
string_t dump(const int indent = -1) const
|
|
|
2231 |
{
|
|
|
2232 |
std::stringstream ss;
|
|
|
2233 |
// fix locale problems
|
|
|
2234 |
ss.imbue(std::locale(std::locale(), new DecimalSeparator));
|
|
|
2235 |
|
|
|
2236 |
// 6, 15 or 16 digits of precision allows round-trip IEEE 754
|
|
|
2237 |
// string->float->string, string->double->string or string->long
|
|
|
2238 |
// double->string; to be safe, we read this value from
|
|
|
2239 |
// std::numeric_limits<number_float_t>::digits10
|
|
|
2240 |
ss.precision(std::numeric_limits<double>::digits10);
|
|
|
2241 |
|
|
|
2242 |
if (indent >= 0)
|
|
|
2243 |
{
|
|
|
2244 |
dump(ss, true, static_cast<unsigned int>(indent));
|
|
|
2245 |
}
|
|
|
2246 |
else
|
|
|
2247 |
{
|
|
|
2248 |
dump(ss, false, 0);
|
|
|
2249 |
}
|
|
|
2250 |
|
|
|
2251 |
return ss.str();
|
|
|
2252 |
}
|
|
|
2253 |
|
|
|
2254 |
/*!
|
|
|
2255 |
@brief return the type of the JSON value (explicit)
|
|
|
2256 |
|
|
|
2257 |
Return the type of the JSON value as a value from the @ref value_t
|
|
|
2258 |
enumeration.
|
|
|
2259 |
|
|
|
2260 |
@return the type of the JSON value
|
|
|
2261 |
|
|
|
2262 |
@complexity Constant.
|
|
|
2263 |
|
|
|
2264 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2265 |
exceptions.
|
|
|
2266 |
|
|
|
2267 |
@liveexample{The following code exemplifies `type()` for all JSON
|
|
|
2268 |
types.,type}
|
|
|
2269 |
|
|
|
2270 |
@since version 1.0.0
|
|
|
2271 |
*/
|
|
|
2272 |
constexpr value_t type() const noexcept
|
|
|
2273 |
{
|
|
|
2274 |
return m_type;
|
|
|
2275 |
}
|
|
|
2276 |
|
|
|
2277 |
/*!
|
|
|
2278 |
@brief return whether type is primitive
|
|
|
2279 |
|
|
|
2280 |
This function returns true iff the JSON type is primitive (string, number,
|
|
|
2281 |
boolean, or null).
|
|
|
2282 |
|
|
|
2283 |
@return `true` if type is primitive (string, number, boolean, or null),
|
|
|
2284 |
`false` otherwise.
|
|
|
2285 |
|
|
|
2286 |
@complexity Constant.
|
|
|
2287 |
|
|
|
2288 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2289 |
exceptions.
|
|
|
2290 |
|
|
|
2291 |
@liveexample{The following code exemplifies `is_primitive()` for all JSON
|
|
|
2292 |
types.,is_primitive}
|
|
|
2293 |
|
|
|
2294 |
@sa @ref is_structured() -- returns whether JSON value is structured
|
|
|
2295 |
@sa @ref is_null() -- returns whether JSON value is `null`
|
|
|
2296 |
@sa @ref is_string() -- returns whether JSON value is a string
|
|
|
2297 |
@sa @ref is_boolean() -- returns whether JSON value is a boolean
|
|
|
2298 |
@sa @ref is_number() -- returns whether JSON value is a number
|
|
|
2299 |
|
|
|
2300 |
@since version 1.0.0
|
|
|
2301 |
*/
|
|
|
2302 |
constexpr bool is_primitive() const noexcept
|
|
|
2303 |
{
|
|
|
2304 |
return is_null() or is_string() or is_boolean() or is_number();
|
|
|
2305 |
}
|
|
|
2306 |
|
|
|
2307 |
/*!
|
|
|
2308 |
@brief return whether type is structured
|
|
|
2309 |
|
|
|
2310 |
This function returns true iff the JSON type is structured (array or
|
|
|
2311 |
object).
|
|
|
2312 |
|
|
|
2313 |
@return `true` if type is structured (array or object), `false` otherwise.
|
|
|
2314 |
|
|
|
2315 |
@complexity Constant.
|
|
|
2316 |
|
|
|
2317 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2318 |
exceptions.
|
|
|
2319 |
|
|
|
2320 |
@liveexample{The following code exemplifies `is_structured()` for all JSON
|
|
|
2321 |
types.,is_structured}
|
|
|
2322 |
|
|
|
2323 |
@sa @ref is_primitive() -- returns whether value is primitive
|
|
|
2324 |
@sa @ref is_array() -- returns whether value is an array
|
|
|
2325 |
@sa @ref is_object() -- returns whether value is an object
|
|
|
2326 |
|
|
|
2327 |
@since version 1.0.0
|
|
|
2328 |
*/
|
|
|
2329 |
constexpr bool is_structured() const noexcept
|
|
|
2330 |
{
|
|
|
2331 |
return is_array() or is_object();
|
|
|
2332 |
}
|
|
|
2333 |
|
|
|
2334 |
/*!
|
|
|
2335 |
@brief return whether value is null
|
|
|
2336 |
|
|
|
2337 |
This function returns true iff the JSON value is null.
|
|
|
2338 |
|
|
|
2339 |
@return `true` if type is null, `false` otherwise.
|
|
|
2340 |
|
|
|
2341 |
@complexity Constant.
|
|
|
2342 |
|
|
|
2343 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2344 |
exceptions.
|
|
|
2345 |
|
|
|
2346 |
@liveexample{The following code exemplifies `is_null()` for all JSON
|
|
|
2347 |
types.,is_null}
|
|
|
2348 |
|
|
|
2349 |
@since version 1.0.0
|
|
|
2350 |
*/
|
|
|
2351 |
constexpr bool is_null() const noexcept
|
|
|
2352 |
{
|
|
|
2353 |
return m_type == value_t::null;
|
|
|
2354 |
}
|
|
|
2355 |
|
|
|
2356 |
/*!
|
|
|
2357 |
@brief return whether value is a boolean
|
|
|
2358 |
|
|
|
2359 |
This function returns true iff the JSON value is a boolean.
|
|
|
2360 |
|
|
|
2361 |
@return `true` if type is boolean, `false` otherwise.
|
|
|
2362 |
|
|
|
2363 |
@complexity Constant.
|
|
|
2364 |
|
|
|
2365 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2366 |
exceptions.
|
|
|
2367 |
|
|
|
2368 |
@liveexample{The following code exemplifies `is_boolean()` for all JSON
|
|
|
2369 |
types.,is_boolean}
|
|
|
2370 |
|
|
|
2371 |
@since version 1.0.0
|
|
|
2372 |
*/
|
|
|
2373 |
constexpr bool is_boolean() const noexcept
|
|
|
2374 |
{
|
|
|
2375 |
return m_type == value_t::boolean;
|
|
|
2376 |
}
|
|
|
2377 |
|
|
|
2378 |
/*!
|
|
|
2379 |
@brief return whether value is a number
|
|
|
2380 |
|
|
|
2381 |
This function returns true iff the JSON value is a number. This includes
|
|
|
2382 |
both integer and floating-point values.
|
|
|
2383 |
|
|
|
2384 |
@return `true` if type is number (regardless whether integer, unsigned
|
|
|
2385 |
integer or floating-type), `false` otherwise.
|
|
|
2386 |
|
|
|
2387 |
@complexity Constant.
|
|
|
2388 |
|
|
|
2389 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2390 |
exceptions.
|
|
|
2391 |
|
|
|
2392 |
@liveexample{The following code exemplifies `is_number()` for all JSON
|
|
|
2393 |
types.,is_number}
|
|
|
2394 |
|
|
|
2395 |
@sa @ref is_number_integer() -- check if value is an integer or unsigned
|
|
|
2396 |
integer number
|
|
|
2397 |
@sa @ref is_number_unsigned() -- check if value is an unsigned integer
|
|
|
2398 |
number
|
|
|
2399 |
@sa @ref is_number_float() -- check if value is a floating-point number
|
|
|
2400 |
|
|
|
2401 |
@since version 1.0.0
|
|
|
2402 |
*/
|
|
|
2403 |
constexpr bool is_number() const noexcept
|
|
|
2404 |
{
|
|
|
2405 |
return is_number_integer() or is_number_float();
|
|
|
2406 |
}
|
|
|
2407 |
|
|
|
2408 |
/*!
|
|
|
2409 |
@brief return whether value is an integer number
|
|
|
2410 |
|
|
|
2411 |
This function returns true iff the JSON value is an integer or unsigned
|
|
|
2412 |
integer number. This excludes floating-point values.
|
|
|
2413 |
|
|
|
2414 |
@return `true` if type is an integer or unsigned integer number, `false`
|
|
|
2415 |
otherwise.
|
|
|
2416 |
|
|
|
2417 |
@complexity Constant.
|
|
|
2418 |
|
|
|
2419 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2420 |
exceptions.
|
|
|
2421 |
|
|
|
2422 |
@liveexample{The following code exemplifies `is_number_integer()` for all
|
|
|
2423 |
JSON types.,is_number_integer}
|
|
|
2424 |
|
|
|
2425 |
@sa @ref is_number() -- check if value is a number
|
|
|
2426 |
@sa @ref is_number_unsigned() -- check if value is an unsigned integer
|
|
|
2427 |
number
|
|
|
2428 |
@sa @ref is_number_float() -- check if value is a floating-point number
|
|
|
2429 |
|
|
|
2430 |
@since version 1.0.0
|
|
|
2431 |
*/
|
|
|
2432 |
constexpr bool is_number_integer() const noexcept
|
|
|
2433 |
{
|
|
|
2434 |
return m_type == value_t::number_integer or m_type == value_t::number_unsigned;
|
|
|
2435 |
}
|
|
|
2436 |
|
|
|
2437 |
/*!
|
|
|
2438 |
@brief return whether value is an unsigned integer number
|
|
|
2439 |
|
|
|
2440 |
This function returns true iff the JSON value is an unsigned integer
|
|
|
2441 |
number. This excludes floating-point and (signed) integer values.
|
|
|
2442 |
|
|
|
2443 |
@return `true` if type is an unsigned integer number, `false` otherwise.
|
|
|
2444 |
|
|
|
2445 |
@complexity Constant.
|
|
|
2446 |
|
|
|
2447 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2448 |
exceptions.
|
|
|
2449 |
|
|
|
2450 |
@liveexample{The following code exemplifies `is_number_unsigned()` for all
|
|
|
2451 |
JSON types.,is_number_unsigned}
|
|
|
2452 |
|
|
|
2453 |
@sa @ref is_number() -- check if value is a number
|
|
|
2454 |
@sa @ref is_number_integer() -- check if value is an integer or unsigned
|
|
|
2455 |
integer number
|
|
|
2456 |
@sa @ref is_number_float() -- check if value is a floating-point number
|
|
|
2457 |
|
|
|
2458 |
@since version 2.0.0
|
|
|
2459 |
*/
|
|
|
2460 |
constexpr bool is_number_unsigned() const noexcept
|
|
|
2461 |
{
|
|
|
2462 |
return m_type == value_t::number_unsigned;
|
|
|
2463 |
}
|
|
|
2464 |
|
|
|
2465 |
/*!
|
|
|
2466 |
@brief return whether value is a floating-point number
|
|
|
2467 |
|
|
|
2468 |
This function returns true iff the JSON value is a floating-point number.
|
|
|
2469 |
This excludes integer and unsigned integer values.
|
|
|
2470 |
|
|
|
2471 |
@return `true` if type is a floating-point number, `false` otherwise.
|
|
|
2472 |
|
|
|
2473 |
@complexity Constant.
|
|
|
2474 |
|
|
|
2475 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2476 |
exceptions.
|
|
|
2477 |
|
|
|
2478 |
@liveexample{The following code exemplifies `is_number_float()` for all
|
|
|
2479 |
JSON types.,is_number_float}
|
|
|
2480 |
|
|
|
2481 |
@sa @ref is_number() -- check if value is number
|
|
|
2482 |
@sa @ref is_number_integer() -- check if value is an integer number
|
|
|
2483 |
@sa @ref is_number_unsigned() -- check if value is an unsigned integer
|
|
|
2484 |
number
|
|
|
2485 |
|
|
|
2486 |
@since version 1.0.0
|
|
|
2487 |
*/
|
|
|
2488 |
constexpr bool is_number_float() const noexcept
|
|
|
2489 |
{
|
|
|
2490 |
return m_type == value_t::number_float;
|
|
|
2491 |
}
|
|
|
2492 |
|
|
|
2493 |
/*!
|
|
|
2494 |
@brief return whether value is an object
|
|
|
2495 |
|
|
|
2496 |
This function returns true iff the JSON value is an object.
|
|
|
2497 |
|
|
|
2498 |
@return `true` if type is object, `false` otherwise.
|
|
|
2499 |
|
|
|
2500 |
@complexity Constant.
|
|
|
2501 |
|
|
|
2502 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2503 |
exceptions.
|
|
|
2504 |
|
|
|
2505 |
@liveexample{The following code exemplifies `is_object()` for all JSON
|
|
|
2506 |
types.,is_object}
|
|
|
2507 |
|
|
|
2508 |
@since version 1.0.0
|
|
|
2509 |
*/
|
|
|
2510 |
constexpr bool is_object() const noexcept
|
|
|
2511 |
{
|
|
|
2512 |
return m_type == value_t::object;
|
|
|
2513 |
}
|
|
|
2514 |
|
|
|
2515 |
/*!
|
|
|
2516 |
@brief return whether value is an array
|
|
|
2517 |
|
|
|
2518 |
This function returns true iff the JSON value is an array.
|
|
|
2519 |
|
|
|
2520 |
@return `true` if type is array, `false` otherwise.
|
|
|
2521 |
|
|
|
2522 |
@complexity Constant.
|
|
|
2523 |
|
|
|
2524 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2525 |
exceptions.
|
|
|
2526 |
|
|
|
2527 |
@liveexample{The following code exemplifies `is_array()` for all JSON
|
|
|
2528 |
types.,is_array}
|
|
|
2529 |
|
|
|
2530 |
@since version 1.0.0
|
|
|
2531 |
*/
|
|
|
2532 |
constexpr bool is_array() const noexcept
|
|
|
2533 |
{
|
|
|
2534 |
return m_type == value_t::array;
|
|
|
2535 |
}
|
|
|
2536 |
|
|
|
2537 |
/*!
|
|
|
2538 |
@brief return whether value is a string
|
|
|
2539 |
|
|
|
2540 |
This function returns true iff the JSON value is a string.
|
|
|
2541 |
|
|
|
2542 |
@return `true` if type is string, `false` otherwise.
|
|
|
2543 |
|
|
|
2544 |
@complexity Constant.
|
|
|
2545 |
|
|
|
2546 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2547 |
exceptions.
|
|
|
2548 |
|
|
|
2549 |
@liveexample{The following code exemplifies `is_string()` for all JSON
|
|
|
2550 |
types.,is_string}
|
|
|
2551 |
|
|
|
2552 |
@since version 1.0.0
|
|
|
2553 |
*/
|
|
|
2554 |
constexpr bool is_string() const noexcept
|
|
|
2555 |
{
|
|
|
2556 |
return m_type == value_t::string;
|
|
|
2557 |
}
|
|
|
2558 |
|
|
|
2559 |
/*!
|
|
|
2560 |
@brief return whether value is discarded
|
|
|
2561 |
|
|
|
2562 |
This function returns true iff the JSON value was discarded during parsing
|
|
|
2563 |
with a callback function (see @ref parser_callback_t).
|
|
|
2564 |
|
|
|
2565 |
@note This function will always be `false` for JSON values after parsing.
|
|
|
2566 |
That is, discarded values can only occur during parsing, but will be
|
|
|
2567 |
removed when inside a structured value or replaced by null in other cases.
|
|
|
2568 |
|
|
|
2569 |
@return `true` if type is discarded, `false` otherwise.
|
|
|
2570 |
|
|
|
2571 |
@complexity Constant.
|
|
|
2572 |
|
|
|
2573 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2574 |
exceptions.
|
|
|
2575 |
|
|
|
2576 |
@liveexample{The following code exemplifies `is_discarded()` for all JSON
|
|
|
2577 |
types.,is_discarded}
|
|
|
2578 |
|
|
|
2579 |
@since version 1.0.0
|
|
|
2580 |
*/
|
|
|
2581 |
constexpr bool is_discarded() const noexcept
|
|
|
2582 |
{
|
|
|
2583 |
return m_type == value_t::discarded;
|
|
|
2584 |
}
|
|
|
2585 |
|
|
|
2586 |
/*!
|
|
|
2587 |
@brief return the type of the JSON value (implicit)
|
|
|
2588 |
|
|
|
2589 |
Implicitly return the type of the JSON value as a value from the @ref
|
|
|
2590 |
value_t enumeration.
|
|
|
2591 |
|
|
|
2592 |
@return the type of the JSON value
|
|
|
2593 |
|
|
|
2594 |
@complexity Constant.
|
|
|
2595 |
|
|
|
2596 |
@exceptionsafety No-throw guarantee: this member function never throws
|
|
|
2597 |
exceptions.
|
|
|
2598 |
|
|
|
2599 |
@liveexample{The following code exemplifies the @ref value_t operator for
|
|
|
2600 |
all JSON types.,operator__value_t}
|
|
|
2601 |
|
|
|
2602 |
@since version 1.0.0
|
|
|
2603 |
*/
|
|
|
2604 |
constexpr operator value_t() const noexcept
|
|
|
2605 |
{
|
|
|
2606 |
return m_type;
|
|
|
2607 |
}
|
|
|
2608 |
|
|
|
2609 |
/// @}
|
|
|
2610 |
|
|
|
2611 |
private:
|
|
|
2612 |
//////////////////
|
|
|
2613 |
// value access //
|
|
|
2614 |
//////////////////
|
|
|
2615 |
|
|
|
2616 |
/// get an object (explicit)
|
|
|
2617 |
template <class T, typename
|
|
|
2618 |
std::enable_if<
|
|
|
2619 |
std::is_convertible<typename object_t::key_type, typename T::key_type>::value and
|
|
|
2620 |
std::is_convertible<basic_json_t, typename T::mapped_type>::value
|
|
|
2621 |
, int>::type = 0>
|
|
|
2622 |
T get_impl(T*) const
|
|
|
2623 |
{
|
|
|
2624 |
if (is_object())
|
|
|
2625 |
{
|
|
|
2626 |
return T(m_value.object->begin(), m_value.object->end());
|
|
|
2627 |
}
|
|
|
2628 |
else
|
|
|
2629 |
{
|
|
|
2630 |
throw std::domain_error("type must be object, but is " + type_name());
|
|
|
2631 |
}
|
|
|
2632 |
}
|
|
|
2633 |
|
|
|
2634 |
/// get an object (explicit)
|
|
|
2635 |
object_t get_impl(object_t*) const
|
|
|
2636 |
{
|
|
|
2637 |
if (is_object())
|
|
|
2638 |
{
|
|
|
2639 |
return *(m_value.object);
|
|
|
2640 |
}
|
|
|
2641 |
else
|
|
|
2642 |
{
|
|
|
2643 |
throw std::domain_error("type must be object, but is " + type_name());
|
|
|
2644 |
}
|
|
|
2645 |
}
|
|
|
2646 |
|
|
|
2647 |
/// get an array (explicit)
|
|
|
2648 |
template <class T, typename
|
|
|
2649 |
std::enable_if<
|
|
|
2650 |
std::is_convertible<basic_json_t, typename T::value_type>::value and
|
|
|
2651 |
not std::is_same<basic_json_t, typename T::value_type>::value and
|
|
|
2652 |
not std::is_arithmetic<T>::value and
|
|
|
2653 |
not std::is_convertible<std::string, T>::value and
|
|
|
2654 |
not has_mapped_type<T>::value
|
|
|
2655 |
, int>::type = 0>
|
|
|
2656 |
T get_impl(T*) const
|
|
|
2657 |
{
|
|
|
2658 |
if (is_array())
|
|
|
2659 |
{
|
|
|
2660 |
T to_vector;
|
|
|
2661 |
std::transform(m_value.array->begin(), m_value.array->end(),
|
|
|
2662 |
std::inserter(to_vector, to_vector.end()), [](basic_json i)
|
|
|
2663 |
{
|
|
|
2664 |
return i.get<typename T::value_type>();
|
|
|
2665 |
});
|
|
|
2666 |
return to_vector;
|
|
|
2667 |
}
|
|
|
2668 |
else
|
|
|
2669 |
{
|
|
|
2670 |
throw std::domain_error("type must be array, but is " + type_name());
|
|
|
2671 |
}
|
|
|
2672 |
}
|
|
|
2673 |
|
|
|
2674 |
/// get an array (explicit)
|
|
|
2675 |
template <class T, typename
|
|
|
2676 |
std::enable_if<
|
|
|
2677 |
std::is_convertible<basic_json_t, T>::value and
|
|
|
2678 |
not std::is_same<basic_json_t, T>::value
|
|
|
2679 |
, int>::type = 0>
|
|
|
2680 |
std::vector<T> get_impl(std::vector<T>*) const
|
|
|
2681 |
{
|
|
|
2682 |
if (is_array())
|
|
|
2683 |
{
|
|
|
2684 |
std::vector<T> to_vector;
|
|
|
2685 |
to_vector.reserve(m_value.array->size());
|
|
|
2686 |
std::transform(m_value.array->begin(), m_value.array->end(),
|
|
|
2687 |
std::inserter(to_vector, to_vector.end()), [](basic_json i)
|
|
|
2688 |
{
|
|
|
2689 |
return i.get<T>();
|
|
|
2690 |
});
|
|
|
2691 |
return to_vector;
|
|
|
2692 |
}
|
|
|
2693 |
else
|
|
|
2694 |
{
|
|
|
2695 |
throw std::domain_error("type must be array, but is " + type_name());
|
|
|
2696 |
}
|
|
|
2697 |
}
|
|
|
2698 |
|
|
|
2699 |
/// get an array (explicit)
|
|
|
2700 |
template <class T, typename
|
|
|
2701 |
std::enable_if<
|
|
|
2702 |
std::is_same<basic_json, typename T::value_type>::value and
|
|
|
2703 |
not has_mapped_type<T>::value
|
|
|
2704 |
, int>::type = 0>
|
|
|
2705 |
T get_impl(T*) const
|
|
|
2706 |
{
|
|
|
2707 |
if (is_array())
|
|
|
2708 |
{
|
|
|
2709 |
return T(m_value.array->begin(), m_value.array->end());
|
|
|
2710 |
}
|
|
|
2711 |
else
|
|
|
2712 |
{
|
|
|
2713 |
throw std::domain_error("type must be array, but is " + type_name());
|
|
|
2714 |
}
|
|
|
2715 |
}
|
|
|
2716 |
|
|
|
2717 |
/// get an array (explicit)
|
|
|
2718 |
array_t get_impl(array_t*) const
|
|
|
2719 |
{
|
|
|
2720 |
if (is_array())
|
|
|
2721 |
{
|
|
|
2722 |
return *(m_value.array);
|
|
|
2723 |
}
|
|
|
2724 |
else
|
|
|
2725 |
{
|
|
|
2726 |
throw std::domain_error("type must be array, but is " + type_name());
|
|
|
2727 |
}
|
|
|
2728 |
}
|
|
|
2729 |
|
|
|
2730 |
/// get a string (explicit)
|
|
|
2731 |
template <typename T, typename
|
|
|
2732 |
std::enable_if<
|
|
|
2733 |
std::is_convertible<string_t, T>::value
|
|
|
2734 |
, int>::type = 0>
|
|
|
2735 |
T get_impl(T*) const
|
|
|
2736 |
{
|
|
|
2737 |
if (is_string())
|
|
|
2738 |
{
|
|
|
2739 |
return *m_value.string;
|
|
|
2740 |
}
|
|
|
2741 |
else
|
|
|
2742 |
{
|
|
|
2743 |
throw std::domain_error("type must be string, but is " + type_name());
|
|
|
2744 |
}
|
|
|
2745 |
}
|
|
|
2746 |
|
|
|
2747 |
/// get a number (explicit)
|
|
|
2748 |
template<typename T, typename
|
|
|
2749 |
std::enable_if<
|
|
|
2750 |
std::is_arithmetic<T>::value
|
|
|
2751 |
, int>::type = 0>
|
|
|
2752 |
T get_impl(T*) const
|
|
|
2753 |
{
|
|
|
2754 |
switch (m_type)
|
|
|
2755 |
{
|
|
|
2756 |
case value_t::number_integer:
|
|
|
2757 |
{
|
|
|
2758 |
return static_cast<T>(m_value.number_integer);
|
|
|
2759 |
}
|
|
|
2760 |
|
|
|
2761 |
case value_t::number_unsigned:
|
|
|
2762 |
{
|
|
|
2763 |
return static_cast<T>(m_value.number_unsigned);
|
|
|
2764 |
}
|
|
|
2765 |
|
|
|
2766 |
case value_t::number_float:
|
|
|
2767 |
{
|
|
|
2768 |
return static_cast<T>(m_value.number_float);
|
|
|
2769 |
}
|
|
|
2770 |
|
|
|
2771 |
default:
|
|
|
2772 |
{
|
|
|
2773 |
throw std::domain_error("type must be number, but is " + type_name());
|
|
|
2774 |
}
|
|
|
2775 |
}
|
|
|
2776 |
}
|
|
|
2777 |
|
|
|
2778 |
/// get a boolean (explicit)
|
|
|
2779 |
constexpr boolean_t get_impl(boolean_t*) const
|
|
|
2780 |
{
|
|
|
2781 |
return is_boolean()
|
|
|
2782 |
? m_value.boolean
|
|
|
2783 |
: throw std::domain_error("type must be boolean, but is " + type_name());
|
|
|
2784 |
}
|
|
|
2785 |
|
|
|
2786 |
/// get a pointer to the value (object)
|
|
|
2787 |
object_t* get_impl_ptr(object_t*) noexcept
|
|
|
2788 |
{
|
|
|
2789 |
return is_object() ? m_value.object : nullptr;
|
|
|
2790 |
}
|
|
|
2791 |
|
|
|
2792 |
/// get a pointer to the value (object)
|
|
|
2793 |
constexpr const object_t* get_impl_ptr(const object_t*) const noexcept
|
|
|
2794 |
{
|
|
|
2795 |
return is_object() ? m_value.object : nullptr;
|
|
|
2796 |
}
|
|
|
2797 |
|
|
|
2798 |
/// get a pointer to the value (array)
|
|
|
2799 |
array_t* get_impl_ptr(array_t*) noexcept
|
|
|
2800 |
{
|
|
|
2801 |
return is_array() ? m_value.array : nullptr;
|
|
|
2802 |
}
|
|
|
2803 |
|
|
|
2804 |
/// get a pointer to the value (array)
|
|
|
2805 |
constexpr const array_t* get_impl_ptr(const array_t*) const noexcept
|
|
|
2806 |
{
|
|
|
2807 |
return is_array() ? m_value.array : nullptr;
|
|
|
2808 |
}
|
|
|
2809 |
|
|
|
2810 |
/// get a pointer to the value (string)
|
|
|
2811 |
string_t* get_impl_ptr(string_t*) noexcept
|
|
|
2812 |
{
|
|
|
2813 |
return is_string() ? m_value.string : nullptr;
|
|
|
2814 |
}
|
|
|
2815 |
|
|
|
2816 |
/// get a pointer to the value (string)
|
|
|
2817 |
constexpr const string_t* get_impl_ptr(const string_t*) const noexcept
|
|
|
2818 |
{
|
|
|
2819 |
return is_string() ? m_value.string : nullptr;
|
|
|
2820 |
}
|
|
|
2821 |
|
|
|
2822 |
/// get a pointer to the value (boolean)
|
|
|
2823 |
boolean_t* get_impl_ptr(boolean_t*) noexcept
|
|
|
2824 |
{
|
|
|
2825 |
return is_boolean() ? &m_value.boolean : nullptr;
|
|
|
2826 |
}
|
|
|
2827 |
|
|
|
2828 |
/// get a pointer to the value (boolean)
|
|
|
2829 |
constexpr const boolean_t* get_impl_ptr(const boolean_t*) const noexcept
|
|
|
2830 |
{
|
|
|
2831 |
return is_boolean() ? &m_value.boolean : nullptr;
|
|
|
2832 |
}
|
|
|
2833 |
|
|
|
2834 |
/// get a pointer to the value (integer number)
|
|
|
2835 |
number_integer_t* get_impl_ptr(number_integer_t*) noexcept
|
|
|
2836 |
{
|
|
|
2837 |
return is_number_integer() ? &m_value.number_integer : nullptr;
|
|
|
2838 |
}
|
|
|
2839 |
|
|
|
2840 |
/// get a pointer to the value (integer number)
|
|
|
2841 |
constexpr const number_integer_t* get_impl_ptr(const number_integer_t*) const noexcept
|
|
|
2842 |
{
|
|
|
2843 |
return is_number_integer() ? &m_value.number_integer : nullptr;
|
|
|
2844 |
}
|
|
|
2845 |
|
|
|
2846 |
/// get a pointer to the value (unsigned number)
|
|
|
2847 |
number_unsigned_t* get_impl_ptr(number_unsigned_t*) noexcept
|
|
|
2848 |
{
|
|
|
2849 |
return is_number_unsigned() ? &m_value.number_unsigned : nullptr;
|
|
|
2850 |
}
|
|
|
2851 |
|
|
|
2852 |
/// get a pointer to the value (unsigned number)
|
|
|
2853 |
constexpr const number_unsigned_t* get_impl_ptr(const number_unsigned_t*) const noexcept
|
|
|
2854 |
{
|
|
|
2855 |
return is_number_unsigned() ? &m_value.number_unsigned : nullptr;
|
|
|
2856 |
}
|
|
|
2857 |
|
|
|
2858 |
/// get a pointer to the value (floating-point number)
|
|
|
2859 |
number_float_t* get_impl_ptr(number_float_t*) noexcept
|
|
|
2860 |
{
|
|
|
2861 |
return is_number_float() ? &m_value.number_float : nullptr;
|
|
|
2862 |
}
|
|
|
2863 |
|
|
|
2864 |
/// get a pointer to the value (floating-point number)
|
|
|
2865 |
constexpr const number_float_t* get_impl_ptr(const number_float_t*) const noexcept
|
|
|
2866 |
{
|
|
|
2867 |
return is_number_float() ? &m_value.number_float : nullptr;
|
|
|
2868 |
}
|
|
|
2869 |
|
|
|
2870 |
/*!
|
|
|
2871 |
@brief helper function to implement get_ref()
|
|
|
2872 |
|
|
|
2873 |
This funcion helps to implement get_ref() without code duplication for
|
|
|
2874 |
const and non-const overloads
|
|
|
2875 |
|
|
|
2876 |
@tparam ThisType will be deduced as `basic_json` or `const basic_json`
|
|
|
2877 |
|
|
|
2878 |
@throw std::domain_error if ReferenceType does not match underlying value
|
|
|
2879 |
type of the current JSON
|
|
|
2880 |
*/
|
|
|
2881 |
template<typename ReferenceType, typename ThisType>
|
|
|
2882 |
static ReferenceType get_ref_impl(ThisType& obj)
|
|
|
2883 |
{
|
|
|
2884 |
// helper type
|
|
|
2885 |
using PointerType = typename std::add_pointer<ReferenceType>::type;
|
|
|
2886 |
|
|
|
2887 |
// delegate the call to get_ptr<>()
|
|
|
2888 |
auto ptr = obj.template get_ptr<PointerType>();
|
|
|
2889 |
|
|
|
2890 |
if (ptr != nullptr)
|
|
|
2891 |
{
|
|
|
2892 |
return *ptr;
|
|
|
2893 |
}
|
|
|
2894 |
else
|
|
|
2895 |
{
|
|
|
2896 |
throw std::domain_error("incompatible ReferenceType for get_ref, actual type is " +
|
|
|
2897 |
obj.type_name());
|
|
|
2898 |
}
|
|
|
2899 |
}
|
|
|
2900 |
|
|
|
2901 |
public:
|
|
|
2902 |
|
|
|
2903 |
/// @name value access
|
|
|
2904 |
/// Direct access to the stored value of a JSON value.
|
|
|
2905 |
/// @{
|
|
|
2906 |
|
|
|
2907 |
/*!
|
|
|
2908 |
@brief get a value (explicit)
|
|
|
2909 |
|
|
|
2910 |
Explicit type conversion between the JSON value and a compatible value.
|
|
|
2911 |
|
|
|
2912 |
@tparam ValueType non-pointer type compatible to the JSON value, for
|
|
|
2913 |
instance `int` for JSON integer numbers, `bool` for JSON booleans, or
|
|
|
2914 |
`std::vector` types for JSON arrays
|
|
|
2915 |
|
|
|
2916 |
@return copy of the JSON value, converted to type @a ValueType
|
|
|
2917 |
|
|
|
2918 |
@throw std::domain_error in case passed type @a ValueType is incompatible
|
|
|
2919 |
to JSON; example: `"type must be object, but is null"`
|
|
|
2920 |
|
|
|
2921 |
@complexity Linear in the size of the JSON value.
|
|
|
2922 |
|
|
|
2923 |
@liveexample{The example below shows several conversions from JSON values
|
|
|
2924 |
to other types. There a few things to note: (1) Floating-point numbers can
|
|
|
2925 |
be converted to integers\, (2) A JSON array can be converted to a standard
|
|
|
2926 |
`std::vector<short>`\, (3) A JSON object can be converted to C++
|
|
|
2927 |
associative containers such as `std::unordered_map<std::string\,
|
|
|
2928 |
json>`.,get__ValueType_const}
|
|
|
2929 |
|
|
|
2930 |
@internal
|
|
|
2931 |
The idea of using a casted null pointer to choose the correct
|
|
|
2932 |
implementation is from <http://stackoverflow.com/a/8315197/266378>.
|
|
|
2933 |
@endinternal
|
|
|
2934 |
|
|
|
2935 |
@sa @ref operator ValueType() const for implicit conversion
|
|
|
2936 |
@sa @ref get() for pointer-member access
|
|
|
2937 |
|
|
|
2938 |
@since version 1.0.0
|
|
|
2939 |
*/
|
|
|
2940 |
template<typename ValueType, typename
|
|
|
2941 |
std::enable_if<
|
|
|
2942 |
not std::is_pointer<ValueType>::value
|
|
|
2943 |
, int>::type = 0>
|
|
|
2944 |
ValueType get() const
|
|
|
2945 |
{
|
|
|
2946 |
return get_impl(static_cast<ValueType*>(nullptr));
|
|
|
2947 |
}
|
|
|
2948 |
|
|
|
2949 |
/*!
|
|
|
2950 |
@brief get a pointer value (explicit)
|
|
|
2951 |
|
|
|
2952 |
Explicit pointer access to the internally stored JSON value. No copies are
|
|
|
2953 |
made.
|
|
|
2954 |
|
|
|
2955 |
@warning The pointer becomes invalid if the underlying JSON object
|
|
|
2956 |
changes.
|
|
|
2957 |
|
|
|
2958 |
@tparam PointerType pointer type; must be a pointer to @ref array_t, @ref
|
|
|
2959 |
object_t, @ref string_t, @ref boolean_t, @ref number_integer_t,
|
|
|
2960 |
@ref number_unsigned_t, or @ref number_float_t.
|
|
|
2961 |
|
|
|
2962 |
@return pointer to the internally stored JSON value if the requested
|
|
|
2963 |
pointer type @a PointerType fits to the JSON value; `nullptr` otherwise
|
|
|
2964 |
|
|
|
2965 |
@complexity Constant.
|
|
|
2966 |
|
|
|
2967 |
@liveexample{The example below shows how pointers to internal values of a
|
|
|
2968 |
JSON value can be requested. Note that no type conversions are made and a
|
|
|
2969 |
`nullptr` is returned if the value and the requested pointer type does not
|
|
|
2970 |
match.,get__PointerType}
|
|
|
2971 |
|
|
|
2972 |
@sa @ref get_ptr() for explicit pointer-member access
|
|
|
2973 |
|
|
|
2974 |
@since version 1.0.0
|
|
|
2975 |
*/
|
|
|
2976 |
template<typename PointerType, typename
|
|
|
2977 |
std::enable_if<
|
|
|
2978 |
std::is_pointer<PointerType>::value
|
|
|
2979 |
, int>::type = 0>
|
|
|
2980 |
PointerType get() noexcept
|
|
|
2981 |
{
|
|
|
2982 |
// delegate the call to get_ptr
|
|
|
2983 |
return get_ptr<PointerType>();
|
|
|
2984 |
}
|
|
|
2985 |
|
|
|
2986 |
/*!
|
|
|
2987 |
@brief get a pointer value (explicit)
|
|
|
2988 |
@copydoc get()
|
|
|
2989 |
*/
|
|
|
2990 |
template<typename PointerType, typename
|
|
|
2991 |
std::enable_if<
|
|
|
2992 |
std::is_pointer<PointerType>::value
|
|
|
2993 |
, int>::type = 0>
|
|
|
2994 |
constexpr const PointerType get() const noexcept
|
|
|
2995 |
{
|
|
|
2996 |
// delegate the call to get_ptr
|
|
|
2997 |
return get_ptr<PointerType>();
|
|
|
2998 |
}
|
|
|
2999 |
|
|
|
3000 |
/*!
|
|
|
3001 |
@brief get a pointer value (implicit)
|
|
|
3002 |
|
|
|
3003 |
Implicit pointer access to the internally stored JSON value. No copies are
|
|
|
3004 |
made.
|
|
|
3005 |
|
|
|
3006 |
@warning Writing data to the pointee of the result yields an undefined
|
|
|
3007 |
state.
|
|
|
3008 |
|
|
|
3009 |
@tparam PointerType pointer type; must be a pointer to @ref array_t, @ref
|
|
|
3010 |
object_t, @ref string_t, @ref boolean_t, @ref number_integer_t,
|
|
|
3011 |
@ref number_unsigned_t, or @ref number_float_t. Enforced by a static
|
|
|
3012 |
assertion.
|
|
|
3013 |
|
|
|
3014 |
@return pointer to the internally stored JSON value if the requested
|
|
|
3015 |
pointer type @a PointerType fits to the JSON value; `nullptr` otherwise
|
|
|
3016 |
|
|
|
3017 |
@complexity Constant.
|
|
|
3018 |
|
|
|
3019 |
@liveexample{The example below shows how pointers to internal values of a
|
|
|
3020 |
JSON value can be requested. Note that no type conversions are made and a
|
|
|
3021 |
`nullptr` is returned if the value and the requested pointer type does not
|
|
|
3022 |
match.,get_ptr}
|
|
|
3023 |
|
|
|
3024 |
@since version 1.0.0
|
|
|
3025 |
*/
|
|
|
3026 |
template<typename PointerType, typename
|
|
|
3027 |
std::enable_if<
|
|
|
3028 |
std::is_pointer<PointerType>::value
|
|
|
3029 |
, int>::type = 0>
|
|
|
3030 |
PointerType get_ptr() noexcept
|
|
|
3031 |
{
|
|
|
3032 |
// get the type of the PointerType (remove pointer and const)
|
|
|
3033 |
using pointee_t = typename std::remove_const<typename
|
|
|
3034 |
std::remove_pointer<typename
|
|
|
3035 |
std::remove_const<PointerType>::type>::type>::type;
|
|
|
3036 |
// make sure the type matches the allowed types
|
|
|
3037 |
static_assert(
|
|
|
3038 |
std::is_same<object_t, pointee_t>::value
|
|
|
3039 |
or std::is_same<array_t, pointee_t>::value
|
|
|
3040 |
or std::is_same<string_t, pointee_t>::value
|
|
|
3041 |
or std::is_same<boolean_t, pointee_t>::value
|
|
|
3042 |
or std::is_same<number_integer_t, pointee_t>::value
|
|
|
3043 |
or std::is_same<number_unsigned_t, pointee_t>::value
|
|
|
3044 |
or std::is_same<number_float_t, pointee_t>::value
|
|
|
3045 |
, "incompatible pointer type");
|
|
|
3046 |
|
|
|
3047 |
// delegate the call to get_impl_ptr<>()
|
|
|
3048 |
return get_impl_ptr(static_cast<PointerType>(nullptr));
|
|
|
3049 |
}
|
|
|
3050 |
|
|
|
3051 |
/*!
|
|
|
3052 |
@brief get a pointer value (implicit)
|
|
|
3053 |
@copydoc get_ptr()
|
|
|
3054 |
*/
|
|
|
3055 |
template<typename PointerType, typename
|
|
|
3056 |
std::enable_if<
|
|
|
3057 |
std::is_pointer<PointerType>::value
|
|
|
3058 |
and std::is_const<typename std::remove_pointer<PointerType>::type>::value
|
|
|
3059 |
, int>::type = 0>
|
|
|
3060 |
constexpr const PointerType get_ptr() const noexcept
|
|
|
3061 |
{
|
|
|
3062 |
// get the type of the PointerType (remove pointer and const)
|
|
|
3063 |
using pointee_t = typename std::remove_const<typename
|
|
|
3064 |
std::remove_pointer<typename
|
|
|
3065 |
std::remove_const<PointerType>::type>::type>::type;
|
|
|
3066 |
// make sure the type matches the allowed types
|
|
|
3067 |
static_assert(
|
|
|
3068 |
std::is_same<object_t, pointee_t>::value
|
|
|
3069 |
or std::is_same<array_t, pointee_t>::value
|
|
|
3070 |
or std::is_same<string_t, pointee_t>::value
|
|
|
3071 |
or std::is_same<boolean_t, pointee_t>::value
|
|
|
3072 |
or std::is_same<number_integer_t, pointee_t>::value
|
|
|
3073 |
or std::is_same<number_unsigned_t, pointee_t>::value
|
|
|
3074 |
or std::is_same<number_float_t, pointee_t>::value
|
|
|
3075 |
, "incompatible pointer type");
|
|
|
3076 |
|
|
|
3077 |
// delegate the call to get_impl_ptr<>() const
|
|
|
3078 |
return get_impl_ptr(static_cast<const PointerType>(nullptr));
|
|
|
3079 |
}
|
|
|
3080 |
|
|
|
3081 |
/*!
|
|
|
3082 |
@brief get a reference value (implicit)
|
|
|
3083 |
|
|
|
3084 |
Implict reference access to the internally stored JSON value. No copies
|
|
|
3085 |
are made.
|
|
|
3086 |
|
|
|
3087 |
@warning Writing data to the referee of the result yields an undefined
|
|
|
3088 |
state.
|
|
|
3089 |
|
|
|
3090 |
@tparam ReferenceType reference type; must be a reference to @ref array_t,
|
|
|
3091 |
@ref object_t, @ref string_t, @ref boolean_t, @ref number_integer_t, or
|
|
|
3092 |
@ref number_float_t. Enforced by static assertion.
|
|
|
3093 |
|
|
|
3094 |
@return reference to the internally stored JSON value if the requested
|
|
|
3095 |
reference type @a ReferenceType fits to the JSON value; throws
|
|
|
3096 |
std::domain_error otherwise
|
|
|
3097 |
|
|
|
3098 |
@throw std::domain_error in case passed type @a ReferenceType is
|
|
|
3099 |
incompatible with the stored JSON value
|
|
|
3100 |
|
|
|
3101 |
@complexity Constant.
|
|
|
3102 |
|
|
|
3103 |
@liveexample{The example shows several calls to `get_ref()`.,get_ref}
|
|
|
3104 |
|
|
|
3105 |
@since version 1.1.0
|
|
|
3106 |
*/
|
|
|
3107 |
template<typename ReferenceType, typename
|
|
|
3108 |
std::enable_if<
|
|
|
3109 |
std::is_reference<ReferenceType>::value
|
|
|
3110 |
, int>::type = 0>
|
|
|
3111 |
ReferenceType get_ref()
|
|
|
3112 |
{
|
|
|
3113 |
// delegate call to get_ref_impl
|
|
|
3114 |
return get_ref_impl<ReferenceType>(*this);
|
|
|
3115 |
}
|
|
|
3116 |
|
|
|
3117 |
/*!
|
|
|
3118 |
@brief get a reference value (implicit)
|
|
|
3119 |
@copydoc get_ref()
|
|
|
3120 |
*/
|
|
|
3121 |
template<typename ReferenceType, typename
|
|
|
3122 |
std::enable_if<
|
|
|
3123 |
std::is_reference<ReferenceType>::value
|
|
|
3124 |
and std::is_const<typename std::remove_reference<ReferenceType>::type>::value
|
|
|
3125 |
, int>::type = 0>
|
|
|
3126 |
ReferenceType get_ref() const
|
|
|
3127 |
{
|
|
|
3128 |
// delegate call to get_ref_impl
|
|
|
3129 |
return get_ref_impl<ReferenceType>(*this);
|
|
|
3130 |
}
|
|
|
3131 |
|
|
|
3132 |
/*!
|
|
|
3133 |
@brief get a value (implicit)
|
|
|
3134 |
|
|
|
3135 |
Implicit type conversion between the JSON value and a compatible value.
|
|
|
3136 |
The call is realized by calling @ref get() const.
|
|
|
3137 |
|
|
|
3138 |
@tparam ValueType non-pointer type compatible to the JSON value, for
|
|
|
3139 |
instance `int` for JSON integer numbers, `bool` for JSON booleans, or
|
|
|
3140 |
`std::vector` types for JSON arrays. The character type of @ref string_t
|
|
|
3141 |
as well as an initializer list of this type is excluded to avoid
|
|
|
3142 |
ambiguities as these types implicitly convert to `std::string`.
|
|
|
3143 |
|
|
|
3144 |
@return copy of the JSON value, converted to type @a ValueType
|
|
|
3145 |
|
|
|
3146 |
@throw std::domain_error in case passed type @a ValueType is incompatible
|
|
|
3147 |
to JSON, thrown by @ref get() const
|
|
|
3148 |
|
|
|
3149 |
@complexity Linear in the size of the JSON value.
|
|
|
3150 |
|
|
|
3151 |
@liveexample{The example below shows several conversions from JSON values
|
|
|
3152 |
to other types. There a few things to note: (1) Floating-point numbers can
|
|
|
3153 |
be converted to integers\, (2) A JSON array can be converted to a standard
|
|
|
3154 |
`std::vector<short>`\, (3) A JSON object can be converted to C++
|
|
|
3155 |
associative containers such as `std::unordered_map<std::string\,
|
|
|
3156 |
json>`.,operator__ValueType}
|
|
|
3157 |
|
|
|
3158 |
@since version 1.0.0
|
|
|
3159 |
*/
|
|
|
3160 |
template < typename ValueType, typename
|
|
|
3161 |
std::enable_if <
|
|
|
3162 |
not std::is_pointer<ValueType>::value
|
|
|
3163 |
and not std::is_same<ValueType, typename string_t::value_type>::value
|
|
|
3164 |
#ifndef _MSC_VER // Fix for issue #167 operator<< abiguity under VS2015
|
|
|
3165 |
and not std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
|
|
|
3166 |
#endif
|
|
|
3167 |
, int >::type = 0 >
|
|
|
3168 |
operator ValueType() const
|
|
|
3169 |
{
|
|
|
3170 |
// delegate the call to get<>() const
|
|
|
3171 |
return get<ValueType>();
|
|
|
3172 |
}
|
|
|
3173 |
|
|
|
3174 |
/// @}
|
|
|
3175 |
|
|
|
3176 |
|
|
|
3177 |
////////////////////
|
|
|
3178 |
// element access //
|
|
|
3179 |
////////////////////
|
|
|
3180 |
|
|
|
3181 |
/// @name element access
|
|
|
3182 |
/// Access to the JSON value.
|
|
|
3183 |
/// @{
|
|
|
3184 |
|
|
|
3185 |
/*!
|
|
|
3186 |
@brief access specified array element with bounds checking
|
|
|
3187 |
|
|
|
3188 |
Returns a reference to the element at specified location @a idx, with
|
|
|
3189 |
bounds checking.
|
|
|
3190 |
|
|
|
3191 |
@param[in] idx index of the element to access
|
|
|
3192 |
|
|
|
3193 |
@return reference to the element at index @a idx
|
|
|
3194 |
|
|
|
3195 |
@throw std::domain_error if the JSON value is not an array; example:
|
|
|
3196 |
`"cannot use at() with string"`
|
|
|
3197 |
@throw std::out_of_range if the index @a idx is out of range of the array;
|
|
|
3198 |
that is, `idx >= size()`; example: `"array index 7 is out of range"`
|
|
|
3199 |
|
|
|
3200 |
@complexity Constant.
|
|
|
3201 |
|
|
|
3202 |
@liveexample{The example below shows how array elements can be read and
|
|
|
3203 |
written using `at()`.,at__size_type}
|
|
|
3204 |
|
|
|
3205 |
@since version 1.0.0
|
|
|
3206 |
*/
|
|
|
3207 |
reference at(size_type idx)
|
|
|
3208 |
{
|
|
|
3209 |
// at only works for arrays
|
|
|
3210 |
if (is_array())
|
|
|
3211 |
{
|
|
|
3212 |
try
|
|
|
3213 |
{
|
|
|
3214 |
return m_value.array->at(idx);
|
|
|
3215 |
}
|
|
|
3216 |
catch (std::out_of_range&)
|
|
|
3217 |
{
|
|
|
3218 |
// create better exception explanation
|
|
|
3219 |
throw std::out_of_range("array index " + std::to_string(idx) + " is out of range");
|
|
|
3220 |
}
|
|
|
3221 |
}
|
|
|
3222 |
else
|
|
|
3223 |
{
|
|
|
3224 |
throw std::domain_error("cannot use at() with " + type_name());
|
|
|
3225 |
}
|
|
|
3226 |
}
|
|
|
3227 |
|
|
|
3228 |
/*!
|
|
|
3229 |
@brief access specified array element with bounds checking
|
|
|
3230 |
|
|
|
3231 |
Returns a const reference to the element at specified location @a idx,
|
|
|
3232 |
with bounds checking.
|
|
|
3233 |
|
|
|
3234 |
@param[in] idx index of the element to access
|
|
|
3235 |
|
|
|
3236 |
@return const reference to the element at index @a idx
|
|
|
3237 |
|
|
|
3238 |
@throw std::domain_error if the JSON value is not an array; example:
|
|
|
3239 |
`"cannot use at() with string"`
|
|
|
3240 |
@throw std::out_of_range if the index @a idx is out of range of the array;
|
|
|
3241 |
that is, `idx >= size()`; example: `"array index 7 is out of range"`
|
|
|
3242 |
|
|
|
3243 |
@complexity Constant.
|
|
|
3244 |
|
|
|
3245 |
@liveexample{The example below shows how array elements can be read using
|
|
|
3246 |
`at()`.,at__size_type_const}
|
|
|
3247 |
|
|
|
3248 |
@since version 1.0.0
|
|
|
3249 |
*/
|
|
|
3250 |
const_reference at(size_type idx) const
|
|
|
3251 |
{
|
|
|
3252 |
// at only works for arrays
|
|
|
3253 |
if (is_array())
|
|
|
3254 |
{
|
|
|
3255 |
try
|
|
|
3256 |
{
|
|
|
3257 |
return m_value.array->at(idx);
|
|
|
3258 |
}
|
|
|
3259 |
catch (std::out_of_range&)
|
|
|
3260 |
{
|
|
|
3261 |
// create better exception explanation
|
|
|
3262 |
throw std::out_of_range("array index " + std::to_string(idx) + " is out of range");
|
|
|
3263 |
}
|
|
|
3264 |
}
|
|
|
3265 |
else
|
|
|
3266 |
{
|
|
|
3267 |
throw std::domain_error("cannot use at() with " + type_name());
|
|
|
3268 |
}
|
|
|
3269 |
}
|
|
|
3270 |
|
|
|
3271 |
/*!
|
|
|
3272 |
@brief access specified object element with bounds checking
|
|
|
3273 |
|
|
|
3274 |
Returns a reference to the element at with specified key @a key, with
|
|
|
3275 |
bounds checking.
|
|
|
3276 |
|
|
|
3277 |
@param[in] key key of the element to access
|
|
|
3278 |
|
|
|
3279 |
@return reference to the element at key @a key
|
|
|
3280 |
|
|
|
3281 |
@throw std::domain_error if the JSON value is not an object; example:
|
|
|
3282 |
`"cannot use at() with boolean"`
|
|
|
3283 |
@throw std::out_of_range if the key @a key is is not stored in the object;
|
|
|
3284 |
that is, `find(key) == end()`; example: `"key "the fast" not found"`
|
|
|
3285 |
|
|
|
3286 |
@complexity Logarithmic in the size of the container.
|
|
|
3287 |
|
|
|
3288 |
@liveexample{The example below shows how object elements can be read and
|
|
|
3289 |
written using `at()`.,at__object_t_key_type}
|
|
|
3290 |
|
|
|
3291 |
@sa @ref operator[](const typename object_t::key_type&) for unchecked
|
|
|
3292 |
access by reference
|
|
|
3293 |
@sa @ref value() for access by value with a default value
|
|
|
3294 |
|
|
|
3295 |
@since version 1.0.0
|
|
|
3296 |
*/
|
|
|
3297 |
reference at(const typename object_t::key_type& key)
|
|
|
3298 |
{
|
|
|
3299 |
// at only works for objects
|
|
|
3300 |
if (is_object())
|
|
|
3301 |
{
|
|
|
3302 |
try
|
|
|
3303 |
{
|
|
|
3304 |
return m_value.object->at(key);
|
|
|
3305 |
}
|
|
|
3306 |
catch (std::out_of_range&)
|
|
|
3307 |
{
|
|
|
3308 |
// create better exception explanation
|
|
|
3309 |
throw std::out_of_range("key '" + key + "' not found");
|
|
|
3310 |
}
|
|
|
3311 |
}
|
|
|
3312 |
else
|
|
|
3313 |
{
|
|
|
3314 |
throw std::domain_error("cannot use at() with " + type_name());
|
|
|
3315 |
}
|
|
|
3316 |
}
|
|
|
3317 |
|
|
|
3318 |
/*!
|
|
|
3319 |
@brief access specified object element with bounds checking
|
|
|
3320 |
|
|
|
3321 |
Returns a const reference to the element at with specified key @a key,
|
|
|
3322 |
with bounds checking.
|
|
|
3323 |
|
|
|
3324 |
@param[in] key key of the element to access
|
|
|
3325 |
|
|
|
3326 |
@return const reference to the element at key @a key
|
|
|
3327 |
|
|
|
3328 |
@throw std::domain_error if the JSON value is not an object; example:
|
|
|
3329 |
`"cannot use at() with boolean"`
|
|
|
3330 |
@throw std::out_of_range if the key @a key is is not stored in the object;
|
|
|
3331 |
that is, `find(key) == end()`; example: `"key "the fast" not found"`
|
|
|
3332 |
|
|
|
3333 |
@complexity Logarithmic in the size of the container.
|
|
|
3334 |
|
|
|
3335 |
@liveexample{The example below shows how object elements can be read using
|
|
|
3336 |
`at()`.,at__object_t_key_type_const}
|
|
|
3337 |
|
|
|
3338 |
@sa @ref operator[](const typename object_t::key_type&) for unchecked
|
|
|
3339 |
access by reference
|
|
|
3340 |
@sa @ref value() for access by value with a default value
|
|
|
3341 |
|
|
|
3342 |
@since version 1.0.0
|
|
|
3343 |
*/
|
|
|
3344 |
const_reference at(const typename object_t::key_type& key) const
|
|
|
3345 |
{
|
|
|
3346 |
// at only works for objects
|
|
|
3347 |
if (is_object())
|
|
|
3348 |
{
|
|
|
3349 |
try
|
|
|
3350 |
{
|
|
|
3351 |
return m_value.object->at(key);
|
|
|
3352 |
}
|
|
|
3353 |
catch (std::out_of_range&)
|
|
|
3354 |
{
|
|
|
3355 |
// create better exception explanation
|
|
|
3356 |
throw std::out_of_range("key '" + key + "' not found");
|
|
|
3357 |
}
|
|
|
3358 |
}
|
|
|
3359 |
else
|
|
|
3360 |
{
|
|
|
3361 |
throw std::domain_error("cannot use at() with " + type_name());
|
|
|
3362 |
}
|
|
|
3363 |
}
|
|
|
3364 |
|
|
|
3365 |
/*!
|
|
|
3366 |
@brief access specified array element
|
|
|
3367 |
|
|
|
3368 |
Returns a reference to the element at specified location @a idx.
|
|
|
3369 |
|
|
|
3370 |
@note If @a idx is beyond the range of the array (i.e., `idx >= size()`),
|
|
|
3371 |
then the array is silently filled up with `null` values to make `idx` a
|
|
|
3372 |
valid reference to the last stored element.
|
|
|
3373 |
|
|
|
3374 |
@param[in] idx index of the element to access
|
|
|
3375 |
|
|
|
3376 |
@return reference to the element at index @a idx
|
|
|
3377 |
|
|
|
3378 |
@throw std::domain_error if JSON is not an array or null; example:
|
|
|
3379 |
`"cannot use operator[] with string"`
|
|
|
3380 |
|
|
|
3381 |
@complexity Constant if @a idx is in the range of the array. Otherwise
|
|
|
3382 |
linear in `idx - size()`.
|
|
|
3383 |
|
|
|
3384 |
@liveexample{The example below shows how array elements can be read and
|
|
|
3385 |
written using `[]` operator. Note the addition of `null`
|
|
|
3386 |
values.,operatorarray__size_type}
|
|
|
3387 |
|
|
|
3388 |
@since version 1.0.0
|
|
|
3389 |
*/
|
|
|
3390 |
reference operator[](size_type idx)
|
|
|
3391 |
{
|
|
|
3392 |
// implicitly convert null value to an empty array
|
|
|
3393 |
if (is_null())
|
|
|
3394 |
{
|
|
|
3395 |
m_type = value_t::array;
|
|
|
3396 |
m_value.array = create<array_t>();
|
|
|
3397 |
assert_invariant();
|
|
|
3398 |
}
|
|
|
3399 |
|
|
|
3400 |
// operator[] only works for arrays
|
|
|
3401 |
if (is_array())
|
|
|
3402 |
{
|
|
|
3403 |
// fill up array with null values if given idx is outside range
|
|
|
3404 |
if (idx >= m_value.array->size())
|
|
|
3405 |
{
|
|
|
3406 |
m_value.array->insert(m_value.array->end(),
|
|
|
3407 |
idx - m_value.array->size() + 1,
|
|
|
3408 |
basic_json());
|
|
|
3409 |
}
|
|
|
3410 |
|
|
|
3411 |
return m_value.array->operator[](idx);
|
|
|
3412 |
}
|
|
|
3413 |
else
|
|
|
3414 |
{
|
|
|
3415 |
throw std::domain_error("cannot use operator[] with " + type_name());
|
|
|
3416 |
}
|
|
|
3417 |
}
|
|
|
3418 |
|
|
|
3419 |
/*!
|
|
|
3420 |
@brief access specified array element
|
|
|
3421 |
|
|
|
3422 |
Returns a const reference to the element at specified location @a idx.
|
|
|
3423 |
|
|
|
3424 |
@param[in] idx index of the element to access
|
|
|
3425 |
|
|
|
3426 |
@return const reference to the element at index @a idx
|
|
|
3427 |
|
|
|
3428 |
@throw std::domain_error if JSON is not an array; example: `"cannot use
|
|
|
3429 |
operator[] with null"`
|
|
|
3430 |
|
|
|
3431 |
@complexity Constant.
|
|
|
3432 |
|
|
|
3433 |
@liveexample{The example below shows how array elements can be read using
|
|
|
3434 |
the `[]` operator.,operatorarray__size_type_const}
|
|
|
3435 |
|
|
|
3436 |
@since version 1.0.0
|
|
|
3437 |
*/
|
|
|
3438 |
const_reference operator[](size_type idx) const
|
|
|
3439 |
{
|
|
|
3440 |
// const operator[] only works for arrays
|
|
|
3441 |
if (is_array())
|
|
|
3442 |
{
|
|
|
3443 |
return m_value.array->operator[](idx);
|
|
|
3444 |
}
|
|
|
3445 |
else
|
|
|
3446 |
{
|
|
|
3447 |
throw std::domain_error("cannot use operator[] with " + type_name());
|
|
|
3448 |
}
|
|
|
3449 |
}
|
|
|
3450 |
|
|
|
3451 |
/*!
|
|
|
3452 |
@brief access specified object element
|
|
|
3453 |
|
|
|
3454 |
Returns a reference to the element at with specified key @a key.
|
|
|
3455 |
|
|
|
3456 |
@note If @a key is not found in the object, then it is silently added to
|
|
|
3457 |
the object and filled with a `null` value to make `key` a valid reference.
|
|
|
3458 |
In case the value was `null` before, it is converted to an object.
|
|
|
3459 |
|
|
|
3460 |
@param[in] key key of the element to access
|
|
|
3461 |
|
|
|
3462 |
@return reference to the element at key @a key
|
|
|
3463 |
|
|
|
3464 |
@throw std::domain_error if JSON is not an object or null; example:
|
|
|
3465 |
`"cannot use operator[] with string"`
|
|
|
3466 |
|
|
|
3467 |
@complexity Logarithmic in the size of the container.
|
|
|
3468 |
|
|
|
3469 |
@liveexample{The example below shows how object elements can be read and
|
|
|
3470 |
written using the `[]` operator.,operatorarray__key_type}
|
|
|
3471 |
|
|
|
3472 |
@sa @ref at(const typename object_t::key_type&) for access by reference
|
|
|
3473 |
with range checking
|
|
|
3474 |
@sa @ref value() for access by value with a default value
|
|
|
3475 |
|
|
|
3476 |
@since version 1.0.0
|
|
|
3477 |
*/
|
|
|
3478 |
reference operator[](const typename object_t::key_type& key)
|
|
|
3479 |
{
|
|
|
3480 |
// implicitly convert null value to an empty object
|
|
|
3481 |
if (is_null())
|
|
|
3482 |
{
|
|
|
3483 |
m_type = value_t::object;
|
|
|
3484 |
m_value.object = create<object_t>();
|
|
|
3485 |
assert_invariant();
|
|
|
3486 |
}
|
|
|
3487 |
|
|
|
3488 |
// operator[] only works for objects
|
|
|
3489 |
if (is_object())
|
|
|
3490 |
{
|
|
|
3491 |
return m_value.object->operator[](key);
|
|
|
3492 |
}
|
|
|
3493 |
else
|
|
|
3494 |
{
|
|
|
3495 |
throw std::domain_error("cannot use operator[] with " + type_name());
|
|
|
3496 |
}
|
|
|
3497 |
}
|
|
|
3498 |
|
|
|
3499 |
/*!
|
|
|
3500 |
@brief read-only access specified object element
|
|
|
3501 |
|
|
|
3502 |
Returns a const reference to the element at with specified key @a key. No
|
|
|
3503 |
bounds checking is performed.
|
|
|
3504 |
|
|
|
3505 |
@warning If the element with key @a key does not exist, the behavior is
|
|
|
3506 |
undefined.
|
|
|
3507 |
|
|
|
3508 |
@param[in] key key of the element to access
|
|
|
3509 |
|
|
|
3510 |
@return const reference to the element at key @a key
|
|
|
3511 |
|
|
|
3512 |
@throw std::domain_error if JSON is not an object; example: `"cannot use
|
|
|
3513 |
operator[] with null"`
|
|
|
3514 |
|
|
|
3515 |
@complexity Logarithmic in the size of the container.
|
|
|
3516 |
|
|
|
3517 |
@liveexample{The example below shows how object elements can be read using
|
|
|
3518 |
the `[]` operator.,operatorarray__key_type_const}
|
|
|
3519 |
|
|
|
3520 |
@sa @ref at(const typename object_t::key_type&) for access by reference
|
|
|
3521 |
with range checking
|
|
|
3522 |
@sa @ref value() for access by value with a default value
|
|
|
3523 |
|
|
|
3524 |
@since version 1.0.0
|
|
|
3525 |
*/
|
|
|
3526 |
const_reference operator[](const typename object_t::key_type& key) const
|
|
|
3527 |
{
|
|
|
3528 |
// const operator[] only works for objects
|
|
|
3529 |
if (is_object())
|
|
|
3530 |
{
|
|
|
3531 |
assert(m_value.object->find(key) != m_value.object->end());
|
|
|
3532 |
return m_value.object->find(key)->second;
|
|
|
3533 |
}
|
|
|
3534 |
else
|
|
|
3535 |
{
|
|
|
3536 |
throw std::domain_error("cannot use operator[] with " + type_name());
|
|
|
3537 |
}
|
|
|
3538 |
}
|
|
|
3539 |
|
|
|
3540 |
/*!
|
|
|
3541 |
@brief access specified object element
|
|
|
3542 |
|
|
|
3543 |
Returns a reference to the element at with specified key @a key.
|
|
|
3544 |
|
|
|
3545 |
@note If @a key is not found in the object, then it is silently added to
|
|
|
3546 |
the object and filled with a `null` value to make `key` a valid reference.
|
|
|
3547 |
In case the value was `null` before, it is converted to an object.
|
|
|
3548 |
|
|
|
3549 |
@param[in] key key of the element to access
|
|
|
3550 |
|
|
|
3551 |
@return reference to the element at key @a key
|
|
|
3552 |
|
|
|
3553 |
@throw std::domain_error if JSON is not an object or null; example:
|
|
|
3554 |
`"cannot use operator[] with string"`
|
|
|
3555 |
|
|
|
3556 |
@complexity Logarithmic in the size of the container.
|
|
|
3557 |
|
|
|
3558 |
@liveexample{The example below shows how object elements can be read and
|
|
|
3559 |
written using the `[]` operator.,operatorarray__key_type}
|
|
|
3560 |
|
|
|
3561 |
@sa @ref at(const typename object_t::key_type&) for access by reference
|
|
|
3562 |
with range checking
|
|
|
3563 |
@sa @ref value() for access by value with a default value
|
|
|
3564 |
|
|
|
3565 |
@since version 1.0.0
|
|
|
3566 |
*/
|
|
|
3567 |
template<typename T, std::size_t n>
|
|
|
3568 |
reference operator[](T * (&key)[n])
|
|
|
3569 |
{
|
|
|
3570 |
return operator[](static_cast<const T>(key));
|
|
|
3571 |
}
|
|
|
3572 |
|
|
|
3573 |
/*!
|
|
|
3574 |
@brief read-only access specified object element
|
|
|
3575 |
|
|
|
3576 |
Returns a const reference to the element at with specified key @a key. No
|
|
|
3577 |
bounds checking is performed.
|
|
|
3578 |
|
|
|
3579 |
@warning If the element with key @a key does not exist, the behavior is
|
|
|
3580 |
undefined.
|
|
|
3581 |
|
|
|
3582 |
@note This function is required for compatibility reasons with Clang.
|
|
|
3583 |
|
|
|
3584 |
@param[in] key key of the element to access
|
|
|
3585 |
|
|
|
3586 |
@return const reference to the element at key @a key
|
|
|
3587 |
|
|
|
3588 |
@throw std::domain_error if JSON is not an object; example: `"cannot use
|
|
|
3589 |
operator[] with null"`
|
|
|
3590 |
|
|
|
3591 |
@complexity Logarithmic in the size of the container.
|
|
|
3592 |
|
|
|
3593 |
@liveexample{The example below shows how object elements can be read using
|
|
|
3594 |
the `[]` operator.,operatorarray__key_type_const}
|
|
|
3595 |
|
|
|
3596 |
@sa @ref at(const typename object_t::key_type&) for access by reference
|
|
|
3597 |
with range checking
|
|
|
3598 |
@sa @ref value() for access by value with a default value
|
|
|
3599 |
|
|
|
3600 |
@since version 1.0.0
|
|
|
3601 |
*/
|
|
|
3602 |
template<typename T, std::size_t n>
|
|
|
3603 |
const_reference operator[](T * (&key)[n]) const
|
|
|
3604 |
{
|
|
|
3605 |
return operator[](static_cast<const T>(key));
|
|
|
3606 |
}
|
|
|
3607 |
|
|
|
3608 |
/*!
|
|
|
3609 |
@brief access specified object element
|
|
|
3610 |
|
|
|
3611 |
Returns a reference to the element at with specified key @a key.
|
|
|
3612 |
|
|
|
3613 |
@note If @a key is not found in the object, then it is silently added to
|
|
|
3614 |
the object and filled with a `null` value to make `key` a valid reference.
|
|
|
3615 |
In case the value was `null` before, it is converted to an object.
|
|
|
3616 |
|
|
|
3617 |
@param[in] key key of the element to access
|
|
|
3618 |
|
|
|
3619 |
@return reference to the element at key @a key
|
|
|
3620 |
|
|
|
3621 |
@throw std::domain_error if JSON is not an object or null; example:
|
|
|
3622 |
`"cannot use operator[] with string"`
|
|
|
3623 |
|
|
|
3624 |
@complexity Logarithmic in the size of the container.
|
|
|
3625 |
|
|
|
3626 |
@liveexample{The example below shows how object elements can be read and
|
|
|
3627 |
written using the `[]` operator.,operatorarray__key_type}
|
|
|
3628 |
|
|
|
3629 |
@sa @ref at(const typename object_t::key_type&) for access by reference
|
|
|
3630 |
with range checking
|
|
|
3631 |
@sa @ref value() for access by value with a default value
|
|
|
3632 |
|
|
|
3633 |
@since version 1.1.0
|
|
|
3634 |
*/
|
|
|
3635 |
template<typename T>
|
|
|
3636 |
reference operator[](T* key)
|
|
|
3637 |
{
|
|
|
3638 |
// implicitly convert null to object
|
|
|
3639 |
if (is_null())
|
|
|
3640 |
{
|
|
|
3641 |
m_type = value_t::object;
|
|
|
3642 |
m_value = value_t::object;
|
|
|
3643 |
assert_invariant();
|
|
|
3644 |
}
|
|
|
3645 |
|
|
|
3646 |
// at only works for objects
|
|
|
3647 |
if (is_object())
|
|
|
3648 |
{
|
|
|
3649 |
return m_value.object->operator[](key);
|
|
|
3650 |
}
|
|
|
3651 |
else
|
|
|
3652 |
{
|
|
|
3653 |
throw std::domain_error("cannot use operator[] with " + type_name());
|
|
|
3654 |
}
|
|
|
3655 |
}
|
|
|
3656 |
|
|
|
3657 |
/*!
|
|
|
3658 |
@brief read-only access specified object element
|
|
|
3659 |
|
|
|
3660 |
Returns a const reference to the element at with specified key @a key. No
|
|
|
3661 |
bounds checking is performed.
|
|
|
3662 |
|
|
|
3663 |
@warning If the element with key @a key does not exist, the behavior is
|
|
|
3664 |
undefined.
|
|
|
3665 |
|
|
|
3666 |
@param[in] key key of the element to access
|
|
|
3667 |
|
|
|
3668 |
@return const reference to the element at key @a key
|
|
|
3669 |
|
|
|
3670 |
@throw std::domain_error if JSON is not an object; example: `"cannot use
|
|
|
3671 |
operator[] with null"`
|
|
|
3672 |
|
|
|
3673 |
@complexity Logarithmic in the size of the container.
|
|
|
3674 |
|
|
|
3675 |
@liveexample{The example below shows how object elements can be read using
|
|
|
3676 |
the `[]` operator.,operatorarray__key_type_const}
|
|
|
3677 |
|
|
|
3678 |
@sa @ref at(const typename object_t::key_type&) for access by reference
|
|
|
3679 |
with range checking
|
|
|
3680 |
@sa @ref value() for access by value with a default value
|
|
|
3681 |
|
|
|
3682 |
@since version 1.1.0
|
|
|
3683 |
*/
|
|
|
3684 |
template<typename T>
|
|
|
3685 |
const_reference operator[](T* key) const
|
|
|
3686 |
{
|
|
|
3687 |
// at only works for objects
|
|
|
3688 |
if (is_object())
|
|
|
3689 |
{
|
|
|
3690 |
assert(m_value.object->find(key) != m_value.object->end());
|
|
|
3691 |
return m_value.object->find(key)->second;
|
|
|
3692 |
}
|
|
|
3693 |
else
|
|
|
3694 |
{
|
|
|
3695 |
throw std::domain_error("cannot use operator[] with " + type_name());
|
|
|
3696 |
}
|
|
|
3697 |
}
|
|
|
3698 |
|
|
|
3699 |
/*!
|
|
|
3700 |
@brief access specified object element with default value
|
|
|
3701 |
|
|
|
3702 |
Returns either a copy of an object's element at the specified key @a key
|
|
|
3703 |
or a given default value if no element with key @a key exists.
|
|
|
3704 |
|
|
|
3705 |
The function is basically equivalent to executing
|
|
|
3706 |
@code {.cpp}
|
|
|
3707 |
try {
|
|
|
3708 |
return at(key);
|
|
|
3709 |
} catch(std::out_of_range) {
|
|
|
3710 |
return default_value;
|
|
|
3711 |
}
|
|
|
3712 |
@endcode
|
|
|
3713 |
|
|
|
3714 |
@note Unlike @ref at(const typename object_t::key_type&), this function
|
|
|
3715 |
does not throw if the given key @a key was not found.
|
|
|
3716 |
|
|
|
3717 |
@note Unlike @ref operator[](const typename object_t::key_type& key), this
|
|
|
3718 |
function does not implicitly add an element to the position defined by @a
|
|
|
3719 |
key. This function is furthermore also applicable to const objects.
|
|
|
3720 |
|
|
|
3721 |
@param[in] key key of the element to access
|
|
|
3722 |
@param[in] default_value the value to return if @a key is not found
|
|
|
3723 |
|
|
|
3724 |
@tparam ValueType type compatible to JSON values, for instance `int` for
|
|
|
3725 |
JSON integer numbers, `bool` for JSON booleans, or `std::vector` types for
|
|
|
3726 |
JSON arrays. Note the type of the expected value at @a key and the default
|
|
|
3727 |
value @a default_value must be compatible.
|
|
|
3728 |
|
|
|
3729 |
@return copy of the element at key @a key or @a default_value if @a key
|
|
|
3730 |
is not found
|
|
|
3731 |
|
|
|
3732 |
@throw std::domain_error if JSON is not an object; example: `"cannot use
|
|
|
3733 |
value() with null"`
|
|
|
3734 |
|
|
|
3735 |
@complexity Logarithmic in the size of the container.
|
|
|
3736 |
|
|
|
3737 |
@liveexample{The example below shows how object elements can be queried
|
|
|
3738 |
with a default value.,basic_json__value}
|
|
|
3739 |
|
|
|
3740 |
@sa @ref at(const typename object_t::key_type&) for access by reference
|
|
|
3741 |
with range checking
|
|
|
3742 |
@sa @ref operator[](const typename object_t::key_type&) for unchecked
|
|
|
3743 |
access by reference
|
|
|
3744 |
|
|
|
3745 |
@since version 1.0.0
|
|
|
3746 |
*/
|
|
|
3747 |
template <class ValueType, typename
|
|
|
3748 |
std::enable_if<
|
|
|
3749 |
std::is_convertible<basic_json_t, ValueType>::value
|
|
|
3750 |
, int>::type = 0>
|
|
|
3751 |
ValueType value(const typename object_t::key_type& key, ValueType default_value) const
|
|
|
3752 |
{
|
|
|
3753 |
// at only works for objects
|
|
|
3754 |
if (is_object())
|
|
|
3755 |
{
|
|
|
3756 |
// if key is found, return value and given default value otherwise
|
|
|
3757 |
const auto it = find(key);
|
|
|
3758 |
if (it != end())
|
|
|
3759 |
{
|
|
|
3760 |
return *it;
|
|
|
3761 |
}
|
|
|
3762 |
else
|
|
|
3763 |
{
|
|
|
3764 |
return default_value;
|
|
|
3765 |
}
|
|
|
3766 |
}
|
|
|
3767 |
else
|
|
|
3768 |
{
|
|
|
3769 |
throw std::domain_error("cannot use value() with " + type_name());
|
|
|
3770 |
}
|
|
|
3771 |
}
|
|
|
3772 |
|
|
|
3773 |
/*!
|
|
|
3774 |
@brief overload for a default value of type const char*
|
|
|
3775 |
@copydoc basic_json::value(const typename object_t::key_type&, ValueType) const
|
|
|
3776 |
*/
|
|
|
3777 |
string_t value(const typename object_t::key_type& key, const char* default_value) const
|
|
|
3778 |
{
|
|
|
3779 |
return value(key, string_t(default_value));
|
|
|
3780 |
}
|
|
|
3781 |
|
|
|
3782 |
/*!
|
|
|
3783 |
@brief access specified object element via JSON Pointer with default value
|
|
|
3784 |
|
|
|
3785 |
Returns either a copy of an object's element at the specified key @a key
|
|
|
3786 |
or a given default value if no element with key @a key exists.
|
|
|
3787 |
|
|
|
3788 |
The function is basically equivalent to executing
|
|
|
3789 |
@code {.cpp}
|
|
|
3790 |
try {
|
|
|
3791 |
return at(ptr);
|
|
|
3792 |
} catch(std::out_of_range) {
|
|
|
3793 |
return default_value;
|
|
|
3794 |
}
|
|
|
3795 |
@endcode
|
|
|
3796 |
|
|
|
3797 |
@note Unlike @ref at(const json_pointer&), this function does not throw
|
|
|
3798 |
if the given key @a key was not found.
|
|
|
3799 |
|
|
|
3800 |
@param[in] ptr a JSON pointer to the element to access
|
|
|
3801 |
@param[in] default_value the value to return if @a ptr found no value
|
|
|
3802 |
|
|
|
3803 |
@tparam ValueType type compatible to JSON values, for instance `int` for
|
|
|
3804 |
JSON integer numbers, `bool` for JSON booleans, or `std::vector` types for
|
|
|
3805 |
JSON arrays. Note the type of the expected value at @a key and the default
|
|
|
3806 |
value @a default_value must be compatible.
|
|
|
3807 |
|
|
|
3808 |
@return copy of the element at key @a key or @a default_value if @a key
|
|
|
3809 |
is not found
|
|
|
3810 |
|
|
|
3811 |
@throw std::domain_error if JSON is not an object; example: `"cannot use
|
|
|
3812 |
value() with null"`
|
|
|
3813 |
|
|
|
3814 |
@complexity Logarithmic in the size of the container.
|
|
|
3815 |
|
|
|
3816 |
@liveexample{The example below shows how object elements can be queried
|
|
|
3817 |
with a default value.,basic_json__value_ptr}
|
|
|
3818 |
|
|
|
3819 |
@sa @ref operator[](const json_pointer&) for unchecked access by reference
|
|
|
3820 |
|
|
|
3821 |
@since version 2.0.2
|
|
|
3822 |
*/
|
|
|
3823 |
template <class ValueType, typename
|
|
|
3824 |
std::enable_if<
|
|
|
3825 |
std::is_convertible<basic_json_t, ValueType>::value
|
|
|
3826 |
, int>::type = 0>
|
|
|
3827 |
ValueType value(const json_pointer& ptr, ValueType default_value) const
|
|
|
3828 |
{
|
|
|
3829 |
// at only works for objects
|
|
|
3830 |
if (is_object())
|
|
|
3831 |
{
|
|
|
3832 |
// if pointer resolves a value, return it or use default value
|
|
|
3833 |
try
|
|
|
3834 |
{
|
|
|
3835 |
return ptr.get_checked(this);
|
|
|
3836 |
}
|
|
|
3837 |
catch (std::out_of_range&)
|
|
|
3838 |
{
|
|
|
3839 |
return default_value;
|
|
|
3840 |
}
|
|
|
3841 |
}
|
|
|
3842 |
else
|
|
|
3843 |
{
|
|
|
3844 |
throw std::domain_error("cannot use value() with " + type_name());
|
|
|
3845 |
}
|
|
|
3846 |
}
|
|
|
3847 |
|
|
|
3848 |
/*!
|
|
|
3849 |
@brief overload for a default value of type const char*
|
|
|
3850 |
@copydoc basic_json::value(const json_pointer&, ValueType) const
|
|
|
3851 |
*/
|
|
|
3852 |
string_t value(const json_pointer& ptr, const char* default_value) const
|
|
|
3853 |
{
|
|
|
3854 |
return value(ptr, string_t(default_value));
|
|
|
3855 |
}
|
|
|
3856 |
|
|
|
3857 |
/*!
|
|
|
3858 |
@brief access the first element
|
|
|
3859 |
|
|
|
3860 |
Returns a reference to the first element in the container. For a JSON
|
|
|
3861 |
container `c`, the expression `c.front()` is equivalent to `*c.begin()`.
|
|
|
3862 |
|
|
|
3863 |
@return In case of a structured type (array or object), a reference to the
|
|
|
3864 |
first element is returned. In cast of number, string, or boolean values, a
|
|
|
3865 |
reference to the value is returned.
|
|
|
3866 |
|
|
|
3867 |
@complexity Constant.
|
|
|
3868 |
|
|
|
3869 |
@pre The JSON value must not be `null` (would throw `std::out_of_range`)
|
|
|
3870 |
or an empty array or object (undefined behavior, guarded by assertions).
|
|
|
3871 |
@post The JSON value remains unchanged.
|
|
|
3872 |
|
|
|
3873 |
@throw std::out_of_range when called on `null` value
|
|
|
3874 |
|
|
|
3875 |
@liveexample{The following code shows an example for `front()`.,front}
|
|
|
3876 |
|
|
|
3877 |
@sa @ref back() -- access the last element
|
|
|
3878 |
|
|
|
3879 |
@since version 1.0.0
|
|
|
3880 |
*/
|
|
|
3881 |
reference front()
|
|
|
3882 |
{
|
|
|
3883 |
return *begin();
|
|
|
3884 |
}
|
|
|
3885 |
|
|
|
3886 |
/*!
|
|
|
3887 |
@copydoc basic_json::front()
|
|
|
3888 |
*/
|
|
|
3889 |
const_reference front() const
|
|
|
3890 |
{
|
|
|
3891 |
return *cbegin();
|
|
|
3892 |
}
|
|
|
3893 |
|
|
|
3894 |
/*!
|
|
|
3895 |
@brief access the last element
|
|
|
3896 |
|
|
|
3897 |
Returns a reference to the last element in the container. For a JSON
|
|
|
3898 |
container `c`, the expression `c.back()` is equivalent to
|
|
|
3899 |
@code {.cpp}
|
|
|
3900 |
auto tmp = c.end();
|
|
|
3901 |
--tmp;
|
|
|
3902 |
return *tmp;
|
|
|
3903 |
@endcode
|
|
|
3904 |
|
|
|
3905 |
@return In case of a structured type (array or object), a reference to the
|
|
|
3906 |
last element is returned. In cast of number, string, or boolean values, a
|
|
|
3907 |
reference to the value is returned.
|
|
|
3908 |
|
|
|
3909 |
@complexity Constant.
|
|
|
3910 |
|
|
|
3911 |
@pre The JSON value must not be `null` (would throw `std::out_of_range`)
|
|
|
3912 |
or an empty array or object (undefined behavior, guarded by assertions).
|
|
|
3913 |
@post The JSON value remains unchanged.
|
|
|
3914 |
|
|
|
3915 |
@throw std::out_of_range when called on `null` value.
|
|
|
3916 |
|
|
|
3917 |
@liveexample{The following code shows an example for `back()`.,back}
|
|
|
3918 |
|
|
|
3919 |
@sa @ref front() -- access the first element
|
|
|
3920 |
|
|
|
3921 |
@since version 1.0.0
|
|
|
3922 |
*/
|
|
|
3923 |
reference back()
|
|
|
3924 |
{
|
|
|
3925 |
auto tmp = end();
|
|
|
3926 |
--tmp;
|
|
|
3927 |
return *tmp;
|
|
|
3928 |
}
|
|
|
3929 |
|
|
|
3930 |
/*!
|
|
|
3931 |
@copydoc basic_json::back()
|
|
|
3932 |
*/
|
|
|
3933 |
const_reference back() const
|
|
|
3934 |
{
|
|
|
3935 |
auto tmp = cend();
|
|
|
3936 |
--tmp;
|
|
|
3937 |
return *tmp;
|
|
|
3938 |
}
|
|
|
3939 |
|
|
|
3940 |
/*!
|
|
|
3941 |
@brief remove element given an iterator
|
|
|
3942 |
|
|
|
3943 |
Removes the element specified by iterator @a pos. The iterator @a pos must
|
|
|
3944 |
be valid and dereferenceable. Thus the `end()` iterator (which is valid,
|
|
|
3945 |
but is not dereferenceable) cannot be used as a value for @a pos.
|
|
|
3946 |
|
|
|
3947 |
If called on a primitive type other than `null`, the resulting JSON value
|
|
|
3948 |
will be `null`.
|
|
|
3949 |
|
|
|
3950 |
@param[in] pos iterator to the element to remove
|
|
|
3951 |
@return Iterator following the last removed element. If the iterator @a
|
|
|
3952 |
pos refers to the last element, the `end()` iterator is returned.
|
|
|
3953 |
|
|
|
3954 |
@tparam InteratorType an @ref iterator or @ref const_iterator
|
|
|
3955 |
|
|
|
3956 |
@post Invalidates iterators and references at or after the point of the
|
|
|
3957 |
erase, including the `end()` iterator.
|
|
|
3958 |
|
|
|
3959 |
@throw std::domain_error if called on a `null` value; example: `"cannot
|
|
|
3960 |
use erase() with null"`
|
|
|
3961 |
@throw std::domain_error if called on an iterator which does not belong to
|
|
|
3962 |
the current JSON value; example: `"iterator does not fit current value"`
|
|
|
3963 |
@throw std::out_of_range if called on a primitive type with invalid
|
|
|
3964 |
iterator (i.e., any iterator which is not `begin()`); example: `"iterator
|
|
|
3965 |
out of range"`
|
|
|
3966 |
|
|
|
3967 |
@complexity The complexity depends on the type:
|
|
|
3968 |
- objects: amortized constant
|
|
|
3969 |
- arrays: linear in distance between pos and the end of the container
|
|
|
3970 |
- strings: linear in the length of the string
|
|
|
3971 |
- other types: constant
|
|
|
3972 |
|
|
|
3973 |
@liveexample{The example shows the result of `erase()` for different JSON
|
|
|
3974 |
types.,erase__IteratorType}
|
|
|
3975 |
|
|
|
3976 |
@sa @ref erase(InteratorType, InteratorType) -- removes the elements in
|
|
|
3977 |
the given range
|
|
|
3978 |
@sa @ref erase(const typename object_t::key_type&) -- removes the element
|
|
|
3979 |
from an object at the given key
|
|
|
3980 |
@sa @ref erase(const size_type) -- removes the element from an array at
|
|
|
3981 |
the given index
|
|
|
3982 |
|
|
|
3983 |
@since version 1.0.0
|
|
|
3984 |
*/
|
|
|
3985 |
template <class InteratorType, typename
|
|
|
3986 |
std::enable_if<
|
|
|
3987 |
std::is_same<InteratorType, typename basic_json_t::iterator>::value or
|
|
|
3988 |
std::is_same<InteratorType, typename basic_json_t::const_iterator>::value
|
|
|
3989 |
, int>::type
|
|
|
3990 |
= 0>
|
|
|
3991 |
InteratorType erase(InteratorType pos)
|
|
|
3992 |
{
|
|
|
3993 |
// make sure iterator fits the current value
|
|
|
3994 |
if (this != pos.m_object)
|
|
|
3995 |
{
|
|
|
3996 |
throw std::domain_error("iterator does not fit current value");
|
|
|
3997 |
}
|
|
|
3998 |
|
|
|
3999 |
InteratorType result = end();
|
|
|
4000 |
|
|
|
4001 |
switch (m_type)
|
|
|
4002 |
{
|
|
|
4003 |
case value_t::boolean:
|
|
|
4004 |
case value_t::number_float:
|
|
|
4005 |
case value_t::number_integer:
|
|
|
4006 |
case value_t::number_unsigned:
|
|
|
4007 |
case value_t::string:
|
|
|
4008 |
{
|
|
|
4009 |
if (not pos.m_it.primitive_iterator.is_begin())
|
|
|
4010 |
{
|
|
|
4011 |
throw std::out_of_range("iterator out of range");
|
|
|
4012 |
}
|
|
|
4013 |
|
|
|
4014 |
if (is_string())
|
|
|
4015 |
{
|
|
|
4016 |
AllocatorType<string_t> alloc;
|
|
|
4017 |
alloc.destroy(m_value.string);
|
|
|
4018 |
alloc.deallocate(m_value.string, 1);
|
|
|
4019 |
m_value.string = nullptr;
|
|
|
4020 |
}
|
|
|
4021 |
|
|
|
4022 |
m_type = value_t::null;
|
|
|
4023 |
assert_invariant();
|
|
|
4024 |
break;
|
|
|
4025 |
}
|
|
|
4026 |
|
|
|
4027 |
case value_t::object:
|
|
|
4028 |
{
|
|
|
4029 |
result.m_it.object_iterator = m_value.object->erase(pos.m_it.object_iterator);
|
|
|
4030 |
break;
|
|
|
4031 |
}
|
|
|
4032 |
|
|
|
4033 |
case value_t::array:
|
|
|
4034 |
{
|
|
|
4035 |
result.m_it.array_iterator = m_value.array->erase(pos.m_it.array_iterator);
|
|
|
4036 |
break;
|
|
|
4037 |
}
|
|
|
4038 |
|
|
|
4039 |
default:
|
|
|
4040 |
{
|
|
|
4041 |
throw std::domain_error("cannot use erase() with " + type_name());
|
|
|
4042 |
}
|
|
|
4043 |
}
|
|
|
4044 |
|
|
|
4045 |
return result;
|
|
|
4046 |
}
|
|
|
4047 |
|
|
|
4048 |
/*!
|
|
|
4049 |
@brief remove elements given an iterator range
|
|
|
4050 |
|
|
|
4051 |
Removes the element specified by the range `[first; last)`. The iterator
|
|
|
4052 |
@a first does not need to be dereferenceable if `first == last`: erasing
|
|
|
4053 |
an empty range is a no-op.
|
|
|
4054 |
|
|
|
4055 |
If called on a primitive type other than `null`, the resulting JSON value
|
|
|
4056 |
will be `null`.
|
|
|
4057 |
|
|
|
4058 |
@param[in] first iterator to the beginning of the range to remove
|
|
|
4059 |
@param[in] last iterator past the end of the range to remove
|
|
|
4060 |
@return Iterator following the last removed element. If the iterator @a
|
|
|
4061 |
second refers to the last element, the `end()` iterator is returned.
|
|
|
4062 |
|
|
|
4063 |
@tparam InteratorType an @ref iterator or @ref const_iterator
|
|
|
4064 |
|
|
|
4065 |
@post Invalidates iterators and references at or after the point of the
|
|
|
4066 |
erase, including the `end()` iterator.
|
|
|
4067 |
|
|
|
4068 |
@throw std::domain_error if called on a `null` value; example: `"cannot
|
|
|
4069 |
use erase() with null"`
|
|
|
4070 |
@throw std::domain_error if called on iterators which does not belong to
|
|
|
4071 |
the current JSON value; example: `"iterators do not fit current value"`
|
|
|
4072 |
@throw std::out_of_range if called on a primitive type with invalid
|
|
|
4073 |
iterators (i.e., if `first != begin()` and `last != end()`); example:
|
|
|
4074 |
`"iterators out of range"`
|
|
|
4075 |
|
|
|
4076 |
@complexity The complexity depends on the type:
|
|
|
4077 |
- objects: `log(size()) + std::distance(first, last)`
|
|
|
4078 |
- arrays: linear in the distance between @a first and @a last, plus linear
|
|
|
4079 |
in the distance between @a last and end of the container
|
|
|
4080 |
- strings: linear in the length of the string
|
|
|
4081 |
- other types: constant
|
|
|
4082 |
|
|
|
4083 |
@liveexample{The example shows the result of `erase()` for different JSON
|
|
|
4084 |
types.,erase__IteratorType_IteratorType}
|
|
|
4085 |
|
|
|
4086 |
@sa @ref erase(InteratorType) -- removes the element at a given position
|
|
|
4087 |
@sa @ref erase(const typename object_t::key_type&) -- removes the element
|
|
|
4088 |
from an object at the given key
|
|
|
4089 |
@sa @ref erase(const size_type) -- removes the element from an array at
|
|
|
4090 |
the given index
|
|
|
4091 |
|
|
|
4092 |
@since version 1.0.0
|
|
|
4093 |
*/
|
|
|
4094 |
template <class InteratorType, typename
|
|
|
4095 |
std::enable_if<
|
|
|
4096 |
std::is_same<InteratorType, typename basic_json_t::iterator>::value or
|
|
|
4097 |
std::is_same<InteratorType, typename basic_json_t::const_iterator>::value
|
|
|
4098 |
, int>::type
|
|
|
4099 |
= 0>
|
|
|
4100 |
InteratorType erase(InteratorType first, InteratorType last)
|
|
|
4101 |
{
|
|
|
4102 |
// make sure iterator fits the current value
|
|
|
4103 |
if (this != first.m_object or this != last.m_object)
|
|
|
4104 |
{
|
|
|
4105 |
throw std::domain_error("iterators do not fit current value");
|
|
|
4106 |
}
|
|
|
4107 |
|
|
|
4108 |
InteratorType result = end();
|
|
|
4109 |
|
|
|
4110 |
switch (m_type)
|
|
|
4111 |
{
|
|
|
4112 |
case value_t::boolean:
|
|
|
4113 |
case value_t::number_float:
|
|
|
4114 |
case value_t::number_integer:
|
|
|
4115 |
case value_t::number_unsigned:
|
|
|
4116 |
case value_t::string:
|
|
|
4117 |
{
|
|
|
4118 |
if (not first.m_it.primitive_iterator.is_begin() or not last.m_it.primitive_iterator.is_end())
|
|
|
4119 |
{
|
|
|
4120 |
throw std::out_of_range("iterators out of range");
|
|
|
4121 |
}
|
|
|
4122 |
|
|
|
4123 |
if (is_string())
|
|
|
4124 |
{
|
|
|
4125 |
AllocatorType<string_t> alloc;
|
|
|
4126 |
alloc.destroy(m_value.string);
|
|
|
4127 |
alloc.deallocate(m_value.string, 1);
|
|
|
4128 |
m_value.string = nullptr;
|
|
|
4129 |
}
|
|
|
4130 |
|
|
|
4131 |
m_type = value_t::null;
|
|
|
4132 |
assert_invariant();
|
|
|
4133 |
break;
|
|
|
4134 |
}
|
|
|
4135 |
|
|
|
4136 |
case value_t::object:
|
|
|
4137 |
{
|
|
|
4138 |
result.m_it.object_iterator = m_value.object->erase(first.m_it.object_iterator,
|
|
|
4139 |
last.m_it.object_iterator);
|
|
|
4140 |
break;
|
|
|
4141 |
}
|
|
|
4142 |
|
|
|
4143 |
case value_t::array:
|
|
|
4144 |
{
|
|
|
4145 |
result.m_it.array_iterator = m_value.array->erase(first.m_it.array_iterator,
|
|
|
4146 |
last.m_it.array_iterator);
|
|
|
4147 |
break;
|
|
|
4148 |
}
|
|
|
4149 |
|
|
|
4150 |
default:
|
|
|
4151 |
{
|
|
|
4152 |
throw std::domain_error("cannot use erase() with " + type_name());
|
|
|
4153 |
}
|
|
|
4154 |
}
|
|
|
4155 |
|
|
|
4156 |
return result;
|
|
|
4157 |
}
|
|
|
4158 |
|
|
|
4159 |
/*!
|
|
|
4160 |
@brief remove element from a JSON object given a key
|
|
|
4161 |
|
|
|
4162 |
Removes elements from a JSON object with the key value @a key.
|
|
|
4163 |
|
|
|
4164 |
@param[in] key value of the elements to remove
|
|
|
4165 |
|
|
|
4166 |
@return Number of elements removed. If @a ObjectType is the default
|
|
|
4167 |
`std::map` type, the return value will always be `0` (@a key was not
|
|
|
4168 |
found) or `1` (@a key was found).
|
|
|
4169 |
|
|
|
4170 |
@post References and iterators to the erased elements are invalidated.
|
|
|
4171 |
Other references and iterators are not affected.
|
|
|
4172 |
|
|
|
4173 |
@throw std::domain_error when called on a type other than JSON object;
|
|
|
4174 |
example: `"cannot use erase() with null"`
|
|
|
4175 |
|
|
|
4176 |
@complexity `log(size()) + count(key)`
|
|
|
4177 |
|
|
|
4178 |
@liveexample{The example shows the effect of `erase()`.,erase__key_type}
|
|
|
4179 |
|
|
|
4180 |
@sa @ref erase(InteratorType) -- removes the element at a given position
|
|
|
4181 |
@sa @ref erase(InteratorType, InteratorType) -- removes the elements in
|
|
|
4182 |
the given range
|
|
|
4183 |
@sa @ref erase(const size_type) -- removes the element from an array at
|
|
|
4184 |
the given index
|
|
|
4185 |
|
|
|
4186 |
@since version 1.0.0
|
|
|
4187 |
*/
|
|
|
4188 |
size_type erase(const typename object_t::key_type& key)
|
|
|
4189 |
{
|
|
|
4190 |
// this erase only works for objects
|
|
|
4191 |
if (is_object())
|
|
|
4192 |
{
|
|
|
4193 |
return m_value.object->erase(key);
|
|
|
4194 |
}
|
|
|
4195 |
else
|
|
|
4196 |
{
|
|
|
4197 |
throw std::domain_error("cannot use erase() with " + type_name());
|
|
|
4198 |
}
|
|
|
4199 |
}
|
|
|
4200 |
|
|
|
4201 |
/*!
|
|
|
4202 |
@brief remove element from a JSON array given an index
|
|
|
4203 |
|
|
|
4204 |
Removes element from a JSON array at the index @a idx.
|
|
|
4205 |
|
|
|
4206 |
@param[in] idx index of the element to remove
|
|
|
4207 |
|
|
|
4208 |
@throw std::domain_error when called on a type other than JSON array;
|
|
|
4209 |
example: `"cannot use erase() with null"`
|
|
|
4210 |
@throw std::out_of_range when `idx >= size()`; example: `"array index 17
|
|
|
4211 |
is out of range"`
|
|
|
4212 |
|
|
|
4213 |
@complexity Linear in distance between @a idx and the end of the container.
|
|
|
4214 |
|
|
|
4215 |
@liveexample{The example shows the effect of `erase()`.,erase__size_type}
|
|
|
4216 |
|
|
|
4217 |
@sa @ref erase(InteratorType) -- removes the element at a given position
|
|
|
4218 |
@sa @ref erase(InteratorType, InteratorType) -- removes the elements in
|
|
|
4219 |
the given range
|
|
|
4220 |
@sa @ref erase(const typename object_t::key_type&) -- removes the element
|
|
|
4221 |
from an object at the given key
|
|
|
4222 |
|
|
|
4223 |
@since version 1.0.0
|
|
|
4224 |
*/
|
|
|
4225 |
void erase(const size_type idx)
|
|
|
4226 |
{
|
|
|
4227 |
// this erase only works for arrays
|
|
|
4228 |
if (is_array())
|
|
|
4229 |
{
|
|
|
4230 |
if (idx >= size())
|
|
|
4231 |
{
|
|
|
4232 |
throw std::out_of_range("array index " + std::to_string(idx) + " is out of range");
|
|
|
4233 |
}
|
|
|
4234 |
|
|
|
4235 |
m_value.array->erase(m_value.array->begin() + static_cast<difference_type>(idx));
|
|
|
4236 |
}
|
|
|
4237 |
else
|
|
|
4238 |
{
|
|
|
4239 |
throw std::domain_error("cannot use erase() with " + type_name());
|
|
|
4240 |
}
|
|
|
4241 |
}
|
|
|
4242 |
|
|
|
4243 |
/// @}
|
|
|
4244 |
|
|
|
4245 |
|
|
|
4246 |
////////////
|
|
|
4247 |
// lookup //
|
|
|
4248 |
////////////
|
|
|
4249 |
|
|
|
4250 |
/// @name lookup
|
|
|
4251 |
/// @{
|
|
|
4252 |
|
|
|
4253 |
/*!
|
|
|
4254 |
@brief find an element in a JSON object
|
|
|
4255 |
|
|
|
4256 |
Finds an element in a JSON object with key equivalent to @a key. If the
|
|
|
4257 |
element is not found or the JSON value is not an object, end() is
|
|
|
4258 |
returned.
|
|
|
4259 |
|
|
|
4260 |
@param[in] key key value of the element to search for
|
|
|
4261 |
|
|
|
4262 |
@return Iterator to an element with key equivalent to @a key. If no such
|
|
|
4263 |
element is found, past-the-end (see end()) iterator is returned.
|
|
|
4264 |
|
|
|
4265 |
@complexity Logarithmic in the size of the JSON object.
|
|
|
4266 |
|
|
|
4267 |
@liveexample{The example shows how `find()` is used.,find__key_type}
|
|
|
4268 |
|
|
|
4269 |
@since version 1.0.0
|
|
|
4270 |
*/
|
|
|
4271 |
iterator find(typename object_t::key_type key)
|
|
|
4272 |
{
|
|
|
4273 |
auto result = end();
|
|
|
4274 |
|
|
|
4275 |
if (is_object())
|
|
|
4276 |
{
|
|
|
4277 |
result.m_it.object_iterator = m_value.object->find(key);
|
|
|
4278 |
}
|
|
|
4279 |
|
|
|
4280 |
return result;
|
|
|
4281 |
}
|
|
|
4282 |
|
|
|
4283 |
/*!
|
|
|
4284 |
@brief find an element in a JSON object
|
|
|
4285 |
@copydoc find(typename object_t::key_type)
|
|
|
4286 |
*/
|
|
|
4287 |
const_iterator find(typename object_t::key_type key) const
|
|
|
4288 |
{
|
|
|
4289 |
auto result = cend();
|
|
|
4290 |
|
|
|
4291 |
if (is_object())
|
|
|
4292 |
{
|
|
|
4293 |
result.m_it.object_iterator = m_value.object->find(key);
|
|
|
4294 |
}
|
|
|
4295 |
|
|
|
4296 |
return result;
|
|
|
4297 |
}
|
|
|
4298 |
|
|
|
4299 |
/*!
|
|
|
4300 |
@brief returns the number of occurrences of a key in a JSON object
|
|
|
4301 |
|
|
|
4302 |
Returns the number of elements with key @a key. If ObjectType is the
|
|
|
4303 |
default `std::map` type, the return value will always be `0` (@a key was
|
|
|
4304 |
not found) or `1` (@a key was found).
|
|
|
4305 |
|
|
|
4306 |
@param[in] key key value of the element to count
|
|
|
4307 |
|
|
|
4308 |
@return Number of elements with key @a key. If the JSON value is not an
|
|
|
4309 |
object, the return value will be `0`.
|
|
|
4310 |
|
|
|
4311 |
@complexity Logarithmic in the size of the JSON object.
|
|
|
4312 |
|
|
|
4313 |
@liveexample{The example shows how `count()` is used.,count}
|
|
|
4314 |
|
|
|
4315 |
@since version 1.0.0
|
|
|
4316 |
*/
|
|
|
4317 |
size_type count(typename object_t::key_type key) const
|
|
|
4318 |
{
|
|
|
4319 |
// return 0 for all nonobject types
|
|
|
4320 |
return is_object() ? m_value.object->count(key) : 0;
|
|
|
4321 |
}
|
|
|
4322 |
|
|
|
4323 |
/// @}
|
|
|
4324 |
|
|
|
4325 |
|
|
|
4326 |
///////////////
|
|
|
4327 |
// iterators //
|
|
|
4328 |
///////////////
|
|
|
4329 |
|
|
|
4330 |
/// @name iterators
|
|
|
4331 |
/// @{
|
|
|
4332 |
|
|
|
4333 |
/*!
|
|
|
4334 |
@brief returns an iterator to the first element
|
|
|
4335 |
|
|
|
4336 |
Returns an iterator to the first element.
|
|
|
4337 |
|
|
|
4338 |
@image html range-begin-end.svg "Illustration from cppreference.com"
|
|
|
4339 |
|
|
|
4340 |
@return iterator to the first element
|
|
|
4341 |
|
|
|
4342 |
@complexity Constant.
|
|
|
4343 |
|
|
|
4344 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4345 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
4346 |
requirements:
|
|
|
4347 |
- The complexity is constant.
|
|
|
4348 |
|
|
|
4349 |
@liveexample{The following code shows an example for `begin()`.,begin}
|
|
|
4350 |
|
|
|
4351 |
@sa @ref cbegin() -- returns a const iterator to the beginning
|
|
|
4352 |
@sa @ref end() -- returns an iterator to the end
|
|
|
4353 |
@sa @ref cend() -- returns a const iterator to the end
|
|
|
4354 |
|
|
|
4355 |
@since version 1.0.0
|
|
|
4356 |
*/
|
|
|
4357 |
iterator begin() noexcept
|
|
|
4358 |
{
|
|
|
4359 |
iterator result(this);
|
|
|
4360 |
result.set_begin();
|
|
|
4361 |
return result;
|
|
|
4362 |
}
|
|
|
4363 |
|
|
|
4364 |
/*!
|
|
|
4365 |
@copydoc basic_json::cbegin()
|
|
|
4366 |
*/
|
|
|
4367 |
const_iterator begin() const noexcept
|
|
|
4368 |
{
|
|
|
4369 |
return cbegin();
|
|
|
4370 |
}
|
|
|
4371 |
|
|
|
4372 |
/*!
|
|
|
4373 |
@brief returns a const iterator to the first element
|
|
|
4374 |
|
|
|
4375 |
Returns a const iterator to the first element.
|
|
|
4376 |
|
|
|
4377 |
@image html range-begin-end.svg "Illustration from cppreference.com"
|
|
|
4378 |
|
|
|
4379 |
@return const iterator to the first element
|
|
|
4380 |
|
|
|
4381 |
@complexity Constant.
|
|
|
4382 |
|
|
|
4383 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4384 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
4385 |
requirements:
|
|
|
4386 |
- The complexity is constant.
|
|
|
4387 |
- Has the semantics of `const_cast<const basic_json&>(*this).begin()`.
|
|
|
4388 |
|
|
|
4389 |
@liveexample{The following code shows an example for `cbegin()`.,cbegin}
|
|
|
4390 |
|
|
|
4391 |
@sa @ref begin() -- returns an iterator to the beginning
|
|
|
4392 |
@sa @ref end() -- returns an iterator to the end
|
|
|
4393 |
@sa @ref cend() -- returns a const iterator to the end
|
|
|
4394 |
|
|
|
4395 |
@since version 1.0.0
|
|
|
4396 |
*/
|
|
|
4397 |
const_iterator cbegin() const noexcept
|
|
|
4398 |
{
|
|
|
4399 |
const_iterator result(this);
|
|
|
4400 |
result.set_begin();
|
|
|
4401 |
return result;
|
|
|
4402 |
}
|
|
|
4403 |
|
|
|
4404 |
/*!
|
|
|
4405 |
@brief returns an iterator to one past the last element
|
|
|
4406 |
|
|
|
4407 |
Returns an iterator to one past the last element.
|
|
|
4408 |
|
|
|
4409 |
@image html range-begin-end.svg "Illustration from cppreference.com"
|
|
|
4410 |
|
|
|
4411 |
@return iterator one past the last element
|
|
|
4412 |
|
|
|
4413 |
@complexity Constant.
|
|
|
4414 |
|
|
|
4415 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4416 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
4417 |
requirements:
|
|
|
4418 |
- The complexity is constant.
|
|
|
4419 |
|
|
|
4420 |
@liveexample{The following code shows an example for `end()`.,end}
|
|
|
4421 |
|
|
|
4422 |
@sa @ref cend() -- returns a const iterator to the end
|
|
|
4423 |
@sa @ref begin() -- returns an iterator to the beginning
|
|
|
4424 |
@sa @ref cbegin() -- returns a const iterator to the beginning
|
|
|
4425 |
|
|
|
4426 |
@since version 1.0.0
|
|
|
4427 |
*/
|
|
|
4428 |
iterator end() noexcept
|
|
|
4429 |
{
|
|
|
4430 |
iterator result(this);
|
|
|
4431 |
result.set_end();
|
|
|
4432 |
return result;
|
|
|
4433 |
}
|
|
|
4434 |
|
|
|
4435 |
/*!
|
|
|
4436 |
@copydoc basic_json::cend()
|
|
|
4437 |
*/
|
|
|
4438 |
const_iterator end() const noexcept
|
|
|
4439 |
{
|
|
|
4440 |
return cend();
|
|
|
4441 |
}
|
|
|
4442 |
|
|
|
4443 |
/*!
|
|
|
4444 |
@brief returns a const iterator to one past the last element
|
|
|
4445 |
|
|
|
4446 |
Returns a const iterator to one past the last element.
|
|
|
4447 |
|
|
|
4448 |
@image html range-begin-end.svg "Illustration from cppreference.com"
|
|
|
4449 |
|
|
|
4450 |
@return const iterator one past the last element
|
|
|
4451 |
|
|
|
4452 |
@complexity Constant.
|
|
|
4453 |
|
|
|
4454 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4455 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
4456 |
requirements:
|
|
|
4457 |
- The complexity is constant.
|
|
|
4458 |
- Has the semantics of `const_cast<const basic_json&>(*this).end()`.
|
|
|
4459 |
|
|
|
4460 |
@liveexample{The following code shows an example for `cend()`.,cend}
|
|
|
4461 |
|
|
|
4462 |
@sa @ref end() -- returns an iterator to the end
|
|
|
4463 |
@sa @ref begin() -- returns an iterator to the beginning
|
|
|
4464 |
@sa @ref cbegin() -- returns a const iterator to the beginning
|
|
|
4465 |
|
|
|
4466 |
@since version 1.0.0
|
|
|
4467 |
*/
|
|
|
4468 |
const_iterator cend() const noexcept
|
|
|
4469 |
{
|
|
|
4470 |
const_iterator result(this);
|
|
|
4471 |
result.set_end();
|
|
|
4472 |
return result;
|
|
|
4473 |
}
|
|
|
4474 |
|
|
|
4475 |
/*!
|
|
|
4476 |
@brief returns an iterator to the reverse-beginning
|
|
|
4477 |
|
|
|
4478 |
Returns an iterator to the reverse-beginning; that is, the last element.
|
|
|
4479 |
|
|
|
4480 |
@image html range-rbegin-rend.svg "Illustration from cppreference.com"
|
|
|
4481 |
|
|
|
4482 |
@complexity Constant.
|
|
|
4483 |
|
|
|
4484 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4485 |
[ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)
|
|
|
4486 |
requirements:
|
|
|
4487 |
- The complexity is constant.
|
|
|
4488 |
- Has the semantics of `reverse_iterator(end())`.
|
|
|
4489 |
|
|
|
4490 |
@liveexample{The following code shows an example for `rbegin()`.,rbegin}
|
|
|
4491 |
|
|
|
4492 |
@sa @ref crbegin() -- returns a const reverse iterator to the beginning
|
|
|
4493 |
@sa @ref rend() -- returns a reverse iterator to the end
|
|
|
4494 |
@sa @ref crend() -- returns a const reverse iterator to the end
|
|
|
4495 |
|
|
|
4496 |
@since version 1.0.0
|
|
|
4497 |
*/
|
|
|
4498 |
reverse_iterator rbegin() noexcept
|
|
|
4499 |
{
|
|
|
4500 |
return reverse_iterator(end());
|
|
|
4501 |
}
|
|
|
4502 |
|
|
|
4503 |
/*!
|
|
|
4504 |
@copydoc basic_json::crbegin()
|
|
|
4505 |
*/
|
|
|
4506 |
const_reverse_iterator rbegin() const noexcept
|
|
|
4507 |
{
|
|
|
4508 |
return crbegin();
|
|
|
4509 |
}
|
|
|
4510 |
|
|
|
4511 |
/*!
|
|
|
4512 |
@brief returns an iterator to the reverse-end
|
|
|
4513 |
|
|
|
4514 |
Returns an iterator to the reverse-end; that is, one before the first
|
|
|
4515 |
element.
|
|
|
4516 |
|
|
|
4517 |
@image html range-rbegin-rend.svg "Illustration from cppreference.com"
|
|
|
4518 |
|
|
|
4519 |
@complexity Constant.
|
|
|
4520 |
|
|
|
4521 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4522 |
[ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)
|
|
|
4523 |
requirements:
|
|
|
4524 |
- The complexity is constant.
|
|
|
4525 |
- Has the semantics of `reverse_iterator(begin())`.
|
|
|
4526 |
|
|
|
4527 |
@liveexample{The following code shows an example for `rend()`.,rend}
|
|
|
4528 |
|
|
|
4529 |
@sa @ref crend() -- returns a const reverse iterator to the end
|
|
|
4530 |
@sa @ref rbegin() -- returns a reverse iterator to the beginning
|
|
|
4531 |
@sa @ref crbegin() -- returns a const reverse iterator to the beginning
|
|
|
4532 |
|
|
|
4533 |
@since version 1.0.0
|
|
|
4534 |
*/
|
|
|
4535 |
reverse_iterator rend() noexcept
|
|
|
4536 |
{
|
|
|
4537 |
return reverse_iterator(begin());
|
|
|
4538 |
}
|
|
|
4539 |
|
|
|
4540 |
/*!
|
|
|
4541 |
@copydoc basic_json::crend()
|
|
|
4542 |
*/
|
|
|
4543 |
const_reverse_iterator rend() const noexcept
|
|
|
4544 |
{
|
|
|
4545 |
return crend();
|
|
|
4546 |
}
|
|
|
4547 |
|
|
|
4548 |
/*!
|
|
|
4549 |
@brief returns a const reverse iterator to the last element
|
|
|
4550 |
|
|
|
4551 |
Returns a const iterator to the reverse-beginning; that is, the last
|
|
|
4552 |
element.
|
|
|
4553 |
|
|
|
4554 |
@image html range-rbegin-rend.svg "Illustration from cppreference.com"
|
|
|
4555 |
|
|
|
4556 |
@complexity Constant.
|
|
|
4557 |
|
|
|
4558 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4559 |
[ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)
|
|
|
4560 |
requirements:
|
|
|
4561 |
- The complexity is constant.
|
|
|
4562 |
- Has the semantics of `const_cast<const basic_json&>(*this).rbegin()`.
|
|
|
4563 |
|
|
|
4564 |
@liveexample{The following code shows an example for `crbegin()`.,crbegin}
|
|
|
4565 |
|
|
|
4566 |
@sa @ref rbegin() -- returns a reverse iterator to the beginning
|
|
|
4567 |
@sa @ref rend() -- returns a reverse iterator to the end
|
|
|
4568 |
@sa @ref crend() -- returns a const reverse iterator to the end
|
|
|
4569 |
|
|
|
4570 |
@since version 1.0.0
|
|
|
4571 |
*/
|
|
|
4572 |
const_reverse_iterator crbegin() const noexcept
|
|
|
4573 |
{
|
|
|
4574 |
return const_reverse_iterator(cend());
|
|
|
4575 |
}
|
|
|
4576 |
|
|
|
4577 |
/*!
|
|
|
4578 |
@brief returns a const reverse iterator to one before the first
|
|
|
4579 |
|
|
|
4580 |
Returns a const reverse iterator to the reverse-end; that is, one before
|
|
|
4581 |
the first element.
|
|
|
4582 |
|
|
|
4583 |
@image html range-rbegin-rend.svg "Illustration from cppreference.com"
|
|
|
4584 |
|
|
|
4585 |
@complexity Constant.
|
|
|
4586 |
|
|
|
4587 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4588 |
[ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)
|
|
|
4589 |
requirements:
|
|
|
4590 |
- The complexity is constant.
|
|
|
4591 |
- Has the semantics of `const_cast<const basic_json&>(*this).rend()`.
|
|
|
4592 |
|
|
|
4593 |
@liveexample{The following code shows an example for `crend()`.,crend}
|
|
|
4594 |
|
|
|
4595 |
@sa @ref rend() -- returns a reverse iterator to the end
|
|
|
4596 |
@sa @ref rbegin() -- returns a reverse iterator to the beginning
|
|
|
4597 |
@sa @ref crbegin() -- returns a const reverse iterator to the beginning
|
|
|
4598 |
|
|
|
4599 |
@since version 1.0.0
|
|
|
4600 |
*/
|
|
|
4601 |
const_reverse_iterator crend() const noexcept
|
|
|
4602 |
{
|
|
|
4603 |
return const_reverse_iterator(cbegin());
|
|
|
4604 |
}
|
|
|
4605 |
|
|
|
4606 |
private:
|
|
|
4607 |
// forward declaration
|
|
|
4608 |
template<typename IteratorType> class iteration_proxy;
|
|
|
4609 |
|
|
|
4610 |
public:
|
|
|
4611 |
/*!
|
|
|
4612 |
@brief wrapper to access iterator member functions in range-based for
|
|
|
4613 |
|
|
|
4614 |
This function allows to access @ref iterator::key() and @ref
|
|
|
4615 |
iterator::value() during range-based for loops. In these loops, a
|
|
|
4616 |
reference to the JSON values is returned, so there is no access to the
|
|
|
4617 |
underlying iterator.
|
|
|
4618 |
|
|
|
4619 |
@note The name of this function is not yet final and may change in the
|
|
|
4620 |
future.
|
|
|
4621 |
*/
|
|
|
4622 |
static iteration_proxy<iterator> iterator_wrapper(reference cont)
|
|
|
4623 |
{
|
|
|
4624 |
return iteration_proxy<iterator>(cont);
|
|
|
4625 |
}
|
|
|
4626 |
|
|
|
4627 |
/*!
|
|
|
4628 |
@copydoc iterator_wrapper(reference)
|
|
|
4629 |
*/
|
|
|
4630 |
static iteration_proxy<const_iterator> iterator_wrapper(const_reference cont)
|
|
|
4631 |
{
|
|
|
4632 |
return iteration_proxy<const_iterator>(cont);
|
|
|
4633 |
}
|
|
|
4634 |
|
|
|
4635 |
/// @}
|
|
|
4636 |
|
|
|
4637 |
|
|
|
4638 |
//////////////
|
|
|
4639 |
// capacity //
|
|
|
4640 |
//////////////
|
|
|
4641 |
|
|
|
4642 |
/// @name capacity
|
|
|
4643 |
/// @{
|
|
|
4644 |
|
|
|
4645 |
/*!
|
|
|
4646 |
@brief checks whether the container is empty
|
|
|
4647 |
|
|
|
4648 |
Checks if a JSON value has no elements.
|
|
|
4649 |
|
|
|
4650 |
@return The return value depends on the different types and is
|
|
|
4651 |
defined as follows:
|
|
|
4652 |
Value type | return value
|
|
|
4653 |
----------- | -------------
|
|
|
4654 |
null | `true`
|
|
|
4655 |
boolean | `false`
|
|
|
4656 |
string | `false`
|
|
|
4657 |
number | `false`
|
|
|
4658 |
object | result of function `object_t::empty()`
|
|
|
4659 |
array | result of function `array_t::empty()`
|
|
|
4660 |
|
|
|
4661 |
@note This function does not return whether a string stored as JSON value
|
|
|
4662 |
is empty - it returns whether the JSON container itself is empty which is
|
|
|
4663 |
false in the case of a string.
|
|
|
4664 |
|
|
|
4665 |
@complexity Constant, as long as @ref array_t and @ref object_t satisfy
|
|
|
4666 |
the Container concept; that is, their `empty()` functions have constant
|
|
|
4667 |
complexity.
|
|
|
4668 |
|
|
|
4669 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4670 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
4671 |
requirements:
|
|
|
4672 |
- The complexity is constant.
|
|
|
4673 |
- Has the semantics of `begin() == end()`.
|
|
|
4674 |
|
|
|
4675 |
@liveexample{The following code uses `empty()` to check if a JSON
|
|
|
4676 |
object contains any elements.,empty}
|
|
|
4677 |
|
|
|
4678 |
@sa @ref size() -- returns the number of elements
|
|
|
4679 |
|
|
|
4680 |
@since version 1.0.0
|
|
|
4681 |
*/
|
|
|
4682 |
bool empty() const noexcept
|
|
|
4683 |
{
|
|
|
4684 |
switch (m_type)
|
|
|
4685 |
{
|
|
|
4686 |
case value_t::null:
|
|
|
4687 |
{
|
|
|
4688 |
// null values are empty
|
|
|
4689 |
return true;
|
|
|
4690 |
}
|
|
|
4691 |
|
|
|
4692 |
case value_t::array:
|
|
|
4693 |
{
|
|
|
4694 |
// delegate call to array_t::empty()
|
|
|
4695 |
return m_value.array->empty();
|
|
|
4696 |
}
|
|
|
4697 |
|
|
|
4698 |
case value_t::object:
|
|
|
4699 |
{
|
|
|
4700 |
// delegate call to object_t::empty()
|
|
|
4701 |
return m_value.object->empty();
|
|
|
4702 |
}
|
|
|
4703 |
|
|
|
4704 |
default:
|
|
|
4705 |
{
|
|
|
4706 |
// all other types are nonempty
|
|
|
4707 |
return false;
|
|
|
4708 |
}
|
|
|
4709 |
}
|
|
|
4710 |
}
|
|
|
4711 |
|
|
|
4712 |
/*!
|
|
|
4713 |
@brief returns the number of elements
|
|
|
4714 |
|
|
|
4715 |
Returns the number of elements in a JSON value.
|
|
|
4716 |
|
|
|
4717 |
@return The return value depends on the different types and is
|
|
|
4718 |
defined as follows:
|
|
|
4719 |
Value type | return value
|
|
|
4720 |
----------- | -------------
|
|
|
4721 |
null | `0`
|
|
|
4722 |
boolean | `1`
|
|
|
4723 |
string | `1`
|
|
|
4724 |
number | `1`
|
|
|
4725 |
object | result of function object_t::size()
|
|
|
4726 |
array | result of function array_t::size()
|
|
|
4727 |
|
|
|
4728 |
@note This function does not return the length of a string stored as JSON
|
|
|
4729 |
value - it returns the number of elements in the JSON value which is 1 in
|
|
|
4730 |
the case of a string.
|
|
|
4731 |
|
|
|
4732 |
@complexity Constant, as long as @ref array_t and @ref object_t satisfy
|
|
|
4733 |
the Container concept; that is, their size() functions have constant
|
|
|
4734 |
complexity.
|
|
|
4735 |
|
|
|
4736 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4737 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
4738 |
requirements:
|
|
|
4739 |
- The complexity is constant.
|
|
|
4740 |
- Has the semantics of `std::distance(begin(), end())`.
|
|
|
4741 |
|
|
|
4742 |
@liveexample{The following code calls `size()` on the different value
|
|
|
4743 |
types.,size}
|
|
|
4744 |
|
|
|
4745 |
@sa @ref empty() -- checks whether the container is empty
|
|
|
4746 |
@sa @ref max_size() -- returns the maximal number of elements
|
|
|
4747 |
|
|
|
4748 |
@since version 1.0.0
|
|
|
4749 |
*/
|
|
|
4750 |
size_type size() const noexcept
|
|
|
4751 |
{
|
|
|
4752 |
switch (m_type)
|
|
|
4753 |
{
|
|
|
4754 |
case value_t::null:
|
|
|
4755 |
{
|
|
|
4756 |
// null values are empty
|
|
|
4757 |
return 0;
|
|
|
4758 |
}
|
|
|
4759 |
|
|
|
4760 |
case value_t::array:
|
|
|
4761 |
{
|
|
|
4762 |
// delegate call to array_t::size()
|
|
|
4763 |
return m_value.array->size();
|
|
|
4764 |
}
|
|
|
4765 |
|
|
|
4766 |
case value_t::object:
|
|
|
4767 |
{
|
|
|
4768 |
// delegate call to object_t::size()
|
|
|
4769 |
return m_value.object->size();
|
|
|
4770 |
}
|
|
|
4771 |
|
|
|
4772 |
default:
|
|
|
4773 |
{
|
|
|
4774 |
// all other types have size 1
|
|
|
4775 |
return 1;
|
|
|
4776 |
}
|
|
|
4777 |
}
|
|
|
4778 |
}
|
|
|
4779 |
|
|
|
4780 |
/*!
|
|
|
4781 |
@brief returns the maximum possible number of elements
|
|
|
4782 |
|
|
|
4783 |
Returns the maximum number of elements a JSON value is able to hold due to
|
|
|
4784 |
system or library implementation limitations, i.e. `std::distance(begin(),
|
|
|
4785 |
end())` for the JSON value.
|
|
|
4786 |
|
|
|
4787 |
@return The return value depends on the different types and is
|
|
|
4788 |
defined as follows:
|
|
|
4789 |
Value type | return value
|
|
|
4790 |
----------- | -------------
|
|
|
4791 |
null | `0` (same as `size()`)
|
|
|
4792 |
boolean | `1` (same as `size()`)
|
|
|
4793 |
string | `1` (same as `size()`)
|
|
|
4794 |
number | `1` (same as `size()`)
|
|
|
4795 |
object | result of function `object_t::max_size()`
|
|
|
4796 |
array | result of function `array_t::max_size()`
|
|
|
4797 |
|
|
|
4798 |
@complexity Constant, as long as @ref array_t and @ref object_t satisfy
|
|
|
4799 |
the Container concept; that is, their `max_size()` functions have constant
|
|
|
4800 |
complexity.
|
|
|
4801 |
|
|
|
4802 |
@requirement This function helps `basic_json` satisfying the
|
|
|
4803 |
[Container](http://en.cppreference.com/w/cpp/concept/Container)
|
|
|
4804 |
requirements:
|
|
|
4805 |
- The complexity is constant.
|
|
|
4806 |
- Has the semantics of returning `b.size()` where `b` is the largest
|
|
|
4807 |
possible JSON value.
|
|
|
4808 |
|
|
|
4809 |
@liveexample{The following code calls `max_size()` on the different value
|
|
|
4810 |
types. Note the output is implementation specific.,max_size}
|
|
|
4811 |
|
|
|
4812 |
@sa @ref size() -- returns the number of elements
|
|
|
4813 |
|
|
|
4814 |
@since version 1.0.0
|
|
|
4815 |
*/
|
|
|
4816 |
size_type max_size() const noexcept
|
|
|
4817 |
{
|
|
|
4818 |
switch (m_type)
|
|
|
4819 |
{
|
|
|
4820 |
case value_t::array:
|
|
|
4821 |
{
|
|
|
4822 |
// delegate call to array_t::max_size()
|
|
|
4823 |
return m_value.array->max_size();
|
|
|
4824 |
}
|
|
|
4825 |
|
|
|
4826 |
case value_t::object:
|
|
|
4827 |
{
|
|
|
4828 |
// delegate call to object_t::max_size()
|
|
|
4829 |
return m_value.object->max_size();
|
|
|
4830 |
}
|
|
|
4831 |
|
|
|
4832 |
default:
|
|
|
4833 |
{
|
|
|
4834 |
// all other types have max_size() == size()
|
|
|
4835 |
return size();
|
|
|
4836 |
}
|
|
|
4837 |
}
|
|
|
4838 |
}
|
|
|
4839 |
|
|
|
4840 |
/// @}
|
|
|
4841 |
|
|
|
4842 |
|
|
|
4843 |
///////////////
|
|
|
4844 |
// modifiers //
|
|
|
4845 |
///////////////
|
|
|
4846 |
|
|
|
4847 |
/// @name modifiers
|
|
|
4848 |
/// @{
|
|
|
4849 |
|
|
|
4850 |
/*!
|
|
|
4851 |
@brief clears the contents
|
|
|
4852 |
|
|
|
4853 |
Clears the content of a JSON value and resets it to the default value as
|
|
|
4854 |
if @ref basic_json(value_t) would have been called:
|
|
|
4855 |
|
|
|
4856 |
Value type | initial value
|
|
|
4857 |
----------- | -------------
|
|
|
4858 |
null | `null`
|
|
|
4859 |
boolean | `false`
|
|
|
4860 |
string | `""`
|
|
|
4861 |
number | `0`
|
|
|
4862 |
object | `{}`
|
|
|
4863 |
array | `[]`
|
|
|
4864 |
|
|
|
4865 |
@note Floating-point numbers are set to `0.0` which will be serialized to
|
|
|
4866 |
`0`. The vale type remains @ref number_float_t.
|
|
|
4867 |
|
|
|
4868 |
@complexity Linear in the size of the JSON value.
|
|
|
4869 |
|
|
|
4870 |
@liveexample{The example below shows the effect of `clear()` to different
|
|
|
4871 |
JSON types.,clear}
|
|
|
4872 |
|
|
|
4873 |
@since version 1.0.0
|
|
|
4874 |
*/
|
|
|
4875 |
void clear() noexcept
|
|
|
4876 |
{
|
|
|
4877 |
switch (m_type)
|
|
|
4878 |
{
|
|
|
4879 |
case value_t::number_integer:
|
|
|
4880 |
{
|
|
|
4881 |
m_value.number_integer = 0;
|
|
|
4882 |
break;
|
|
|
4883 |
}
|
|
|
4884 |
|
|
|
4885 |
case value_t::number_unsigned:
|
|
|
4886 |
{
|
|
|
4887 |
m_value.number_unsigned = 0;
|
|
|
4888 |
break;
|
|
|
4889 |
}
|
|
|
4890 |
|
|
|
4891 |
case value_t::number_float:
|
|
|
4892 |
{
|
|
|
4893 |
m_value.number_float = 0.0;
|
|
|
4894 |
break;
|
|
|
4895 |
}
|
|
|
4896 |
|
|
|
4897 |
case value_t::boolean:
|
|
|
4898 |
{
|
|
|
4899 |
m_value.boolean = false;
|
|
|
4900 |
break;
|
|
|
4901 |
}
|
|
|
4902 |
|
|
|
4903 |
case value_t::string:
|
|
|
4904 |
{
|
|
|
4905 |
m_value.string->clear();
|
|
|
4906 |
break;
|
|
|
4907 |
}
|
|
|
4908 |
|
|
|
4909 |
case value_t::array:
|
|
|
4910 |
{
|
|
|
4911 |
m_value.array->clear();
|
|
|
4912 |
break;
|
|
|
4913 |
}
|
|
|
4914 |
|
|
|
4915 |
case value_t::object:
|
|
|
4916 |
{
|
|
|
4917 |
m_value.object->clear();
|
|
|
4918 |
break;
|
|
|
4919 |
}
|
|
|
4920 |
|
|
|
4921 |
default:
|
|
|
4922 |
{
|
|
|
4923 |
break;
|
|
|
4924 |
}
|
|
|
4925 |
}
|
|
|
4926 |
}
|
|
|
4927 |
|
|
|
4928 |
/*!
|
|
|
4929 |
@brief add an object to an array
|
|
|
4930 |
|
|
|
4931 |
Appends the given element @a val to the end of the JSON value. If the
|
|
|
4932 |
function is called on a JSON null value, an empty array is created before
|
|
|
4933 |
appending @a val.
|
|
|
4934 |
|
|
|
4935 |
@param[in] val the value to add to the JSON array
|
|
|
4936 |
|
|
|
4937 |
@throw std::domain_error when called on a type other than JSON array or
|
|
|
4938 |
null; example: `"cannot use push_back() with number"`
|
|
|
4939 |
|
|
|
4940 |
@complexity Amortized constant.
|
|
|
4941 |
|
|
|
4942 |
@liveexample{The example shows how `push_back()` and `+=` can be used to
|
|
|
4943 |
add elements to a JSON array. Note how the `null` value was silently
|
|
|
4944 |
converted to a JSON array.,push_back}
|
|
|
4945 |
|
|
|
4946 |
@since version 1.0.0
|
|
|
4947 |
*/
|
|
|
4948 |
void push_back(basic_json&& val)
|
|
|
4949 |
{
|
|
|
4950 |
// push_back only works for null objects or arrays
|
|
|
4951 |
if (not(is_null() or is_array()))
|
|
|
4952 |
{
|
|
|
4953 |
throw std::domain_error("cannot use push_back() with " + type_name());
|
|
|
4954 |
}
|
|
|
4955 |
|
|
|
4956 |
// transform null object into an array
|
|
|
4957 |
if (is_null())
|
|
|
4958 |
{
|
|
|
4959 |
m_type = value_t::array;
|
|
|
4960 |
m_value = value_t::array;
|
|
|
4961 |
assert_invariant();
|
|
|
4962 |
}
|
|
|
4963 |
|
|
|
4964 |
// add element to array (move semantics)
|
|
|
4965 |
m_value.array->push_back(std::move(val));
|
|
|
4966 |
// invalidate object
|
|
|
4967 |
val.m_type = value_t::null;
|
|
|
4968 |
}
|
|
|
4969 |
|
|
|
4970 |
/*!
|
|
|
4971 |
@brief add an object to an array
|
|
|
4972 |
@copydoc push_back(basic_json&&)
|
|
|
4973 |
*/
|
|
|
4974 |
reference operator+=(basic_json&& val)
|
|
|
4975 |
{
|
|
|
4976 |
push_back(std::move(val));
|
|
|
4977 |
return *this;
|
|
|
4978 |
}
|
|
|
4979 |
|
|
|
4980 |
/*!
|
|
|
4981 |
@brief add an object to an array
|
|
|
4982 |
@copydoc push_back(basic_json&&)
|
|
|
4983 |
*/
|
|
|
4984 |
void push_back(const basic_json& val)
|
|
|
4985 |
{
|
|
|
4986 |
// push_back only works for null objects or arrays
|
|
|
4987 |
if (not(is_null() or is_array()))
|
|
|
4988 |
{
|
|
|
4989 |
throw std::domain_error("cannot use push_back() with " + type_name());
|
|
|
4990 |
}
|
|
|
4991 |
|
|
|
4992 |
// transform null object into an array
|
|
|
4993 |
if (is_null())
|
|
|
4994 |
{
|
|
|
4995 |
m_type = value_t::array;
|
|
|
4996 |
m_value = value_t::array;
|
|
|
4997 |
assert_invariant();
|
|
|
4998 |
}
|
|
|
4999 |
|
|
|
5000 |
// add element to array
|
|
|
5001 |
m_value.array->push_back(val);
|
|
|
5002 |
}
|
|
|
5003 |
|
|
|
5004 |
/*!
|
|
|
5005 |
@brief add an object to an array
|
|
|
5006 |
@copydoc push_back(basic_json&&)
|
|
|
5007 |
*/
|
|
|
5008 |
reference operator+=(const basic_json& val)
|
|
|
5009 |
{
|
|
|
5010 |
push_back(val);
|
|
|
5011 |
return *this;
|
|
|
5012 |
}
|
|
|
5013 |
|
|
|
5014 |
/*!
|
|
|
5015 |
@brief add an object to an object
|
|
|
5016 |
|
|
|
5017 |
Inserts the given element @a val to the JSON object. If the function is
|
|
|
5018 |
called on a JSON null value, an empty object is created before inserting
|
|
|
5019 |
@a val.
|
|
|
5020 |
|
|
|
5021 |
@param[in] val the value to add to the JSON object
|
|
|
5022 |
|
|
|
5023 |
@throw std::domain_error when called on a type other than JSON object or
|
|
|
5024 |
null; example: `"cannot use push_back() with number"`
|
|
|
5025 |
|
|
|
5026 |
@complexity Logarithmic in the size of the container, O(log(`size()`)).
|
|
|
5027 |
|
|
|
5028 |
@liveexample{The example shows how `push_back()` and `+=` can be used to
|
|
|
5029 |
add elements to a JSON object. Note how the `null` value was silently
|
|
|
5030 |
converted to a JSON object.,push_back__object_t__value}
|
|
|
5031 |
|
|
|
5032 |
@since version 1.0.0
|
|
|
5033 |
*/
|
|
|
5034 |
void push_back(const typename object_t::value_type& val)
|
|
|
5035 |
{
|
|
|
5036 |
// push_back only works for null objects or objects
|
|
|
5037 |
if (not(is_null() or is_object()))
|
|
|
5038 |
{
|
|
|
5039 |
throw std::domain_error("cannot use push_back() with " + type_name());
|
|
|
5040 |
}
|
|
|
5041 |
|
|
|
5042 |
// transform null object into an object
|
|
|
5043 |
if (is_null())
|
|
|
5044 |
{
|
|
|
5045 |
m_type = value_t::object;
|
|
|
5046 |
m_value = value_t::object;
|
|
|
5047 |
assert_invariant();
|
|
|
5048 |
}
|
|
|
5049 |
|
|
|
5050 |
// add element to array
|
|
|
5051 |
m_value.object->insert(val);
|
|
|
5052 |
}
|
|
|
5053 |
|
|
|
5054 |
/*!
|
|
|
5055 |
@brief add an object to an object
|
|
|
5056 |
@copydoc push_back(const typename object_t::value_type&)
|
|
|
5057 |
*/
|
|
|
5058 |
reference operator+=(const typename object_t::value_type& val)
|
|
|
5059 |
{
|
|
|
5060 |
push_back(val);
|
|
|
5061 |
return *this;
|
|
|
5062 |
}
|
|
|
5063 |
|
|
|
5064 |
/*!
|
|
|
5065 |
@brief add an object to an object
|
|
|
5066 |
|
|
|
5067 |
This function allows to use `push_back` with an initializer list. In case
|
|
|
5068 |
|
|
|
5069 |
1. the current value is an object,
|
|
|
5070 |
2. the initializer list @a init contains only two elements, and
|
|
|
5071 |
3. the first element of @a init is a string,
|
|
|
5072 |
|
|
|
5073 |
@a init is converted into an object element and added using
|
|
|
5074 |
@ref push_back(const typename object_t::value_type&). Otherwise, @a init
|
|
|
5075 |
is converted to a JSON value and added using @ref push_back(basic_json&&).
|
|
|
5076 |
|
|
|
5077 |
@param init an initializer list
|
|
|
5078 |
|
|
|
5079 |
@complexity Linear in the size of the initializer list @a init.
|
|
|
5080 |
|
|
|
5081 |
@note This function is required to resolve an ambiguous overload error,
|
|
|
5082 |
because pairs like `{"key", "value"}` can be both interpreted as
|
|
|
5083 |
`object_t::value_type` or `std::initializer_list<basic_json>`, see
|
|
|
5084 |
https://github.com/nlohmann/json/issues/235 for more information.
|
|
|
5085 |
|
|
|
5086 |
@liveexample{The example shows how initializer lists are treated as
|
|
|
5087 |
objects when possible.,push_back__initializer_list}
|
|
|
5088 |
*/
|
|
|
5089 |
void push_back(std::initializer_list<basic_json> init)
|
|
|
5090 |
{
|
|
|
5091 |
if (is_object() and init.size() == 2 and init.begin()->is_string())
|
|
|
5092 |
{
|
|
|
5093 |
const string_t key = *init.begin();
|
|
|
5094 |
push_back(typename object_t::value_type(key, *(init.begin() + 1)));
|
|
|
5095 |
}
|
|
|
5096 |
else
|
|
|
5097 |
{
|
|
|
5098 |
push_back(basic_json(init));
|
|
|
5099 |
}
|
|
|
5100 |
}
|
|
|
5101 |
|
|
|
5102 |
/*!
|
|
|
5103 |
@brief add an object to an object
|
|
|
5104 |
@copydoc push_back(std::initializer_list<basic_json>)
|
|
|
5105 |
*/
|
|
|
5106 |
reference operator+=(std::initializer_list<basic_json> init)
|
|
|
5107 |
{
|
|
|
5108 |
push_back(init);
|
|
|
5109 |
return *this;
|
|
|
5110 |
}
|
|
|
5111 |
|
|
|
5112 |
/*!
|
|
|
5113 |
@brief inserts element
|
|
|
5114 |
|
|
|
5115 |
Inserts element @a val before iterator @a pos.
|
|
|
5116 |
|
|
|
5117 |
@param[in] pos iterator before which the content will be inserted; may be
|
|
|
5118 |
the end() iterator
|
|
|
5119 |
@param[in] val element to insert
|
|
|
5120 |
@return iterator pointing to the inserted @a val.
|
|
|
5121 |
|
|
|
5122 |
@throw std::domain_error if called on JSON values other than arrays;
|
|
|
5123 |
example: `"cannot use insert() with string"`
|
|
|
5124 |
@throw std::domain_error if @a pos is not an iterator of *this; example:
|
|
|
5125 |
`"iterator does not fit current value"`
|
|
|
5126 |
|
|
|
5127 |
@complexity Constant plus linear in the distance between pos and end of the
|
|
|
5128 |
container.
|
|
|
5129 |
|
|
|
5130 |
@liveexample{The example shows how `insert()` is used.,insert}
|
|
|
5131 |
|
|
|
5132 |
@since version 1.0.0
|
|
|
5133 |
*/
|
|
|
5134 |
iterator insert(const_iterator pos, const basic_json& val)
|
|
|
5135 |
{
|
|
|
5136 |
// insert only works for arrays
|
|
|
5137 |
if (is_array())
|
|
|
5138 |
{
|
|
|
5139 |
// check if iterator pos fits to this JSON value
|
|
|
5140 |
if (pos.m_object != this)
|
|
|
5141 |
{
|
|
|
5142 |
throw std::domain_error("iterator does not fit current value");
|
|
|
5143 |
}
|
|
|
5144 |
|
|
|
5145 |
// insert to array and return iterator
|
|
|
5146 |
iterator result(this);
|
|
|
5147 |
result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, val);
|
|
|
5148 |
return result;
|
|
|
5149 |
}
|
|
|
5150 |
else
|
|
|
5151 |
{
|
|
|
5152 |
throw std::domain_error("cannot use insert() with " + type_name());
|
|
|
5153 |
}
|
|
|
5154 |
}
|
|
|
5155 |
|
|
|
5156 |
/*!
|
|
|
5157 |
@brief inserts element
|
|
|
5158 |
@copydoc insert(const_iterator, const basic_json&)
|
|
|
5159 |
*/
|
|
|
5160 |
iterator insert(const_iterator pos, basic_json&& val)
|
|
|
5161 |
{
|
|
|
5162 |
return insert(pos, val);
|
|
|
5163 |
}
|
|
|
5164 |
|
|
|
5165 |
/*!
|
|
|
5166 |
@brief inserts elements
|
|
|
5167 |
|
|
|
5168 |
Inserts @a cnt copies of @a val before iterator @a pos.
|
|
|
5169 |
|
|
|
5170 |
@param[in] pos iterator before which the content will be inserted; may be
|
|
|
5171 |
the end() iterator
|
|
|
5172 |
@param[in] cnt number of copies of @a val to insert
|
|
|
5173 |
@param[in] val element to insert
|
|
|
5174 |
@return iterator pointing to the first element inserted, or @a pos if
|
|
|
5175 |
`cnt==0`
|
|
|
5176 |
|
|
|
5177 |
@throw std::domain_error if called on JSON values other than arrays;
|
|
|
5178 |
example: `"cannot use insert() with string"`
|
|
|
5179 |
@throw std::domain_error if @a pos is not an iterator of *this; example:
|
|
|
5180 |
`"iterator does not fit current value"`
|
|
|
5181 |
|
|
|
5182 |
@complexity Linear in @a cnt plus linear in the distance between @a pos
|
|
|
5183 |
and end of the container.
|
|
|
5184 |
|
|
|
5185 |
@liveexample{The example shows how `insert()` is used.,insert__count}
|
|
|
5186 |
|
|
|
5187 |
@since version 1.0.0
|
|
|
5188 |
*/
|
|
|
5189 |
iterator insert(const_iterator pos, size_type cnt, const basic_json& val)
|
|
|
5190 |
{
|
|
|
5191 |
// insert only works for arrays
|
|
|
5192 |
if (is_array())
|
|
|
5193 |
{
|
|
|
5194 |
// check if iterator pos fits to this JSON value
|
|
|
5195 |
if (pos.m_object != this)
|
|
|
5196 |
{
|
|
|
5197 |
throw std::domain_error("iterator does not fit current value");
|
|
|
5198 |
}
|
|
|
5199 |
|
|
|
5200 |
// insert to array and return iterator
|
|
|
5201 |
iterator result(this);
|
|
|
5202 |
result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, cnt, val);
|
|
|
5203 |
return result;
|
|
|
5204 |
}
|
|
|
5205 |
else
|
|
|
5206 |
{
|
|
|
5207 |
throw std::domain_error("cannot use insert() with " + type_name());
|
|
|
5208 |
}
|
|
|
5209 |
}
|
|
|
5210 |
|
|
|
5211 |
/*!
|
|
|
5212 |
@brief inserts elements
|
|
|
5213 |
|
|
|
5214 |
Inserts elements from range `[first, last)` before iterator @a pos.
|
|
|
5215 |
|
|
|
5216 |
@param[in] pos iterator before which the content will be inserted; may be
|
|
|
5217 |
the end() iterator
|
|
|
5218 |
@param[in] first begin of the range of elements to insert
|
|
|
5219 |
@param[in] last end of the range of elements to insert
|
|
|
5220 |
|
|
|
5221 |
@throw std::domain_error if called on JSON values other than arrays;
|
|
|
5222 |
example: `"cannot use insert() with string"`
|
|
|
5223 |
@throw std::domain_error if @a pos is not an iterator of *this; example:
|
|
|
5224 |
`"iterator does not fit current value"`
|
|
|
5225 |
@throw std::domain_error if @a first and @a last do not belong to the same
|
|
|
5226 |
JSON value; example: `"iterators do not fit"`
|
|
|
5227 |
@throw std::domain_error if @a first or @a last are iterators into
|
|
|
5228 |
container for which insert is called; example: `"passed iterators may not
|
|
|
5229 |
belong to container"`
|
|
|
5230 |
|
|
|
5231 |
@return iterator pointing to the first element inserted, or @a pos if
|
|
|
5232 |
`first==last`
|
|
|
5233 |
|
|
|
5234 |
@complexity Linear in `std::distance(first, last)` plus linear in the
|
|
|
5235 |
distance between @a pos and end of the container.
|
|
|
5236 |
|
|
|
5237 |
@liveexample{The example shows how `insert()` is used.,insert__range}
|
|
|
5238 |
|
|
|
5239 |
@since version 1.0.0
|
|
|
5240 |
*/
|
|
|
5241 |
iterator insert(const_iterator pos, const_iterator first, const_iterator last)
|
|
|
5242 |
{
|
|
|
5243 |
// insert only works for arrays
|
|
|
5244 |
if (not is_array())
|
|
|
5245 |
{
|
|
|
5246 |
throw std::domain_error("cannot use insert() with " + type_name());
|
|
|
5247 |
}
|
|
|
5248 |
|
|
|
5249 |
// check if iterator pos fits to this JSON value
|
|
|
5250 |
if (pos.m_object != this)
|
|
|
5251 |
{
|
|
|
5252 |
throw std::domain_error("iterator does not fit current value");
|
|
|
5253 |
}
|
|
|
5254 |
|
|
|
5255 |
// check if range iterators belong to the same JSON object
|
|
|
5256 |
if (first.m_object != last.m_object)
|
|
|
5257 |
{
|
|
|
5258 |
throw std::domain_error("iterators do not fit");
|
|
|
5259 |
}
|
|
|
5260 |
|
|
|
5261 |
if (first.m_object == this or last.m_object == this)
|
|
|
5262 |
{
|
|
|
5263 |
throw std::domain_error("passed iterators may not belong to container");
|
|
|
5264 |
}
|
|
|
5265 |
|
|
|
5266 |
// insert to array and return iterator
|
|
|
5267 |
iterator result(this);
|
|
|
5268 |
result.m_it.array_iterator = m_value.array->insert(
|
|
|
5269 |
pos.m_it.array_iterator,
|
|
|
5270 |
first.m_it.array_iterator,
|
|
|
5271 |
last.m_it.array_iterator);
|
|
|
5272 |
return result;
|
|
|
5273 |
}
|
|
|
5274 |
|
|
|
5275 |
/*!
|
|
|
5276 |
@brief inserts elements
|
|
|
5277 |
|
|
|
5278 |
Inserts elements from initializer list @a ilist before iterator @a pos.
|
|
|
5279 |
|
|
|
5280 |
@param[in] pos iterator before which the content will be inserted; may be
|
|
|
5281 |
the end() iterator
|
|
|
5282 |
@param[in] ilist initializer list to insert the values from
|
|
|
5283 |
|
|
|
5284 |
@throw std::domain_error if called on JSON values other than arrays;
|
|
|
5285 |
example: `"cannot use insert() with string"`
|
|
|
5286 |
@throw std::domain_error if @a pos is not an iterator of *this; example:
|
|
|
5287 |
`"iterator does not fit current value"`
|
|
|
5288 |
|
|
|
5289 |
@return iterator pointing to the first element inserted, or @a pos if
|
|
|
5290 |
`ilist` is empty
|
|
|
5291 |
|
|
|
5292 |
@complexity Linear in `ilist.size()` plus linear in the distance between
|
|
|
5293 |
@a pos and end of the container.
|
|
|
5294 |
|
|
|
5295 |
@liveexample{The example shows how `insert()` is used.,insert__ilist}
|
|
|
5296 |
|
|
|
5297 |
@since version 1.0.0
|
|
|
5298 |
*/
|
|
|
5299 |
iterator insert(const_iterator pos, std::initializer_list<basic_json> ilist)
|
|
|
5300 |
{
|
|
|
5301 |
// insert only works for arrays
|
|
|
5302 |
if (not is_array())
|
|
|
5303 |
{
|
|
|
5304 |
throw std::domain_error("cannot use insert() with " + type_name());
|
|
|
5305 |
}
|
|
|
5306 |
|
|
|
5307 |
// check if iterator pos fits to this JSON value
|
|
|
5308 |
if (pos.m_object != this)
|
|
|
5309 |
{
|
|
|
5310 |
throw std::domain_error("iterator does not fit current value");
|
|
|
5311 |
}
|
|
|
5312 |
|
|
|
5313 |
// insert to array and return iterator
|
|
|
5314 |
iterator result(this);
|
|
|
5315 |
result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, ilist);
|
|
|
5316 |
return result;
|
|
|
5317 |
}
|
|
|
5318 |
|
|
|
5319 |
/*!
|
|
|
5320 |
@brief exchanges the values
|
|
|
5321 |
|
|
|
5322 |
Exchanges the contents of the JSON value with those of @a other. Does not
|
|
|
5323 |
invoke any move, copy, or swap operations on individual elements. All
|
|
|
5324 |
iterators and references remain valid. The past-the-end iterator is
|
|
|
5325 |
invalidated.
|
|
|
5326 |
|
|
|
5327 |
@param[in,out] other JSON value to exchange the contents with
|
|
|
5328 |
|
|
|
5329 |
@complexity Constant.
|
|
|
5330 |
|
|
|
5331 |
@liveexample{The example below shows how JSON values can be swapped with
|
|
|
5332 |
`swap()`.,swap__reference}
|
|
|
5333 |
|
|
|
5334 |
@since version 1.0.0
|
|
|
5335 |
*/
|
|
|
5336 |
void swap(reference other) noexcept (
|
|
|
5337 |
std::is_nothrow_move_constructible<value_t>::value and
|
|
|
5338 |
std::is_nothrow_move_assignable<value_t>::value and
|
|
|
5339 |
std::is_nothrow_move_constructible<json_value>::value and
|
|
|
5340 |
std::is_nothrow_move_assignable<json_value>::value
|
|
|
5341 |
)
|
|
|
5342 |
{
|
|
|
5343 |
std::swap(m_type, other.m_type);
|
|
|
5344 |
std::swap(m_value, other.m_value);
|
|
|
5345 |
assert_invariant();
|
|
|
5346 |
}
|
|
|
5347 |
|
|
|
5348 |
/*!
|
|
|
5349 |
@brief exchanges the values
|
|
|
5350 |
|
|
|
5351 |
Exchanges the contents of a JSON array with those of @a other. Does not
|
|
|
5352 |
invoke any move, copy, or swap operations on individual elements. All
|
|
|
5353 |
iterators and references remain valid. The past-the-end iterator is
|
|
|
5354 |
invalidated.
|
|
|
5355 |
|
|
|
5356 |
@param[in,out] other array to exchange the contents with
|
|
|
5357 |
|
|
|
5358 |
@throw std::domain_error when JSON value is not an array; example: `"cannot
|
|
|
5359 |
use swap() with string"`
|
|
|
5360 |
|
|
|
5361 |
@complexity Constant.
|
|
|
5362 |
|
|
|
5363 |
@liveexample{The example below shows how arrays can be swapped with
|
|
|
5364 |
`swap()`.,swap__array_t}
|
|
|
5365 |
|
|
|
5366 |
@since version 1.0.0
|
|
|
5367 |
*/
|
|
|
5368 |
void swap(array_t& other)
|
|
|
5369 |
{
|
|
|
5370 |
// swap only works for arrays
|
|
|
5371 |
if (is_array())
|
|
|
5372 |
{
|
|
|
5373 |
std::swap(*(m_value.array), other);
|
|
|
5374 |
}
|
|
|
5375 |
else
|
|
|
5376 |
{
|
|
|
5377 |
throw std::domain_error("cannot use swap() with " + type_name());
|
|
|
5378 |
}
|
|
|
5379 |
}
|
|
|
5380 |
|
|
|
5381 |
/*!
|
|
|
5382 |
@brief exchanges the values
|
|
|
5383 |
|
|
|
5384 |
Exchanges the contents of a JSON object with those of @a other. Does not
|
|
|
5385 |
invoke any move, copy, or swap operations on individual elements. All
|
|
|
5386 |
iterators and references remain valid. The past-the-end iterator is
|
|
|
5387 |
invalidated.
|
|
|
5388 |
|
|
|
5389 |
@param[in,out] other object to exchange the contents with
|
|
|
5390 |
|
|
|
5391 |
@throw std::domain_error when JSON value is not an object; example:
|
|
|
5392 |
`"cannot use swap() with string"`
|
|
|
5393 |
|
|
|
5394 |
@complexity Constant.
|
|
|
5395 |
|
|
|
5396 |
@liveexample{The example below shows how objects can be swapped with
|
|
|
5397 |
`swap()`.,swap__object_t}
|
|
|
5398 |
|
|
|
5399 |
@since version 1.0.0
|
|
|
5400 |
*/
|
|
|
5401 |
void swap(object_t& other)
|
|
|
5402 |
{
|
|
|
5403 |
// swap only works for objects
|
|
|
5404 |
if (is_object())
|
|
|
5405 |
{
|
|
|
5406 |
std::swap(*(m_value.object), other);
|
|
|
5407 |
}
|
|
|
5408 |
else
|
|
|
5409 |
{
|
|
|
5410 |
throw std::domain_error("cannot use swap() with " + type_name());
|
|
|
5411 |
}
|
|
|
5412 |
}
|
|
|
5413 |
|
|
|
5414 |
/*!
|
|
|
5415 |
@brief exchanges the values
|
|
|
5416 |
|
|
|
5417 |
Exchanges the contents of a JSON string with those of @a other. Does not
|
|
|
5418 |
invoke any move, copy, or swap operations on individual elements. All
|
|
|
5419 |
iterators and references remain valid. The past-the-end iterator is
|
|
|
5420 |
invalidated.
|
|
|
5421 |
|
|
|
5422 |
@param[in,out] other string to exchange the contents with
|
|
|
5423 |
|
|
|
5424 |
@throw std::domain_error when JSON value is not a string; example: `"cannot
|
|
|
5425 |
use swap() with boolean"`
|
|
|
5426 |
|
|
|
5427 |
@complexity Constant.
|
|
|
5428 |
|
|
|
5429 |
@liveexample{The example below shows how strings can be swapped with
|
|
|
5430 |
`swap()`.,swap__string_t}
|
|
|
5431 |
|
|
|
5432 |
@since version 1.0.0
|
|
|
5433 |
*/
|
|
|
5434 |
void swap(string_t& other)
|
|
|
5435 |
{
|
|
|
5436 |
// swap only works for strings
|
|
|
5437 |
if (is_string())
|
|
|
5438 |
{
|
|
|
5439 |
std::swap(*(m_value.string), other);
|
|
|
5440 |
}
|
|
|
5441 |
else
|
|
|
5442 |
{
|
|
|
5443 |
throw std::domain_error("cannot use swap() with " + type_name());
|
|
|
5444 |
}
|
|
|
5445 |
}
|
|
|
5446 |
|
|
|
5447 |
/// @}
|
|
|
5448 |
|
|
|
5449 |
|
|
|
5450 |
//////////////////////////////////////////
|
|
|
5451 |
// lexicographical comparison operators //
|
|
|
5452 |
//////////////////////////////////////////
|
|
|
5453 |
|
|
|
5454 |
/// @name lexicographical comparison operators
|
|
|
5455 |
/// @{
|
|
|
5456 |
|
|
|
5457 |
private:
|
|
|
5458 |
/*!
|
|
|
5459 |
@brief comparison operator for JSON types
|
|
|
5460 |
|
|
|
5461 |
Returns an ordering that is similar to Python:
|
|
|
5462 |
- order: null < boolean < number < object < array < string
|
|
|
5463 |
- furthermore, each type is not smaller than itself
|
|
|
5464 |
|
|
|
5465 |
@since version 1.0.0
|
|
|
5466 |
*/
|
|
|
5467 |
friend bool operator<(const value_t lhs, const value_t rhs) noexcept
|
|
|
5468 |
{
|
|
|
5469 |
static constexpr std::array<uint8_t, 8> order = {{
|
|
|
5470 |
0, // null
|
|
|
5471 |
3, // object
|
|
|
5472 |
4, // array
|
|
|
5473 |
5, // string
|
|
|
5474 |
1, // boolean
|
|
|
5475 |
2, // integer
|
|
|
5476 |
2, // unsigned
|
|
|
5477 |
2, // float
|
|
|
5478 |
}
|
|
|
5479 |
};
|
|
|
5480 |
|
|
|
5481 |
// discarded values are not comparable
|
|
|
5482 |
if (lhs == value_t::discarded or rhs == value_t::discarded)
|
|
|
5483 |
{
|
|
|
5484 |
return false;
|
|
|
5485 |
}
|
|
|
5486 |
|
|
|
5487 |
return order[static_cast<std::size_t>(lhs)] < order[static_cast<std::size_t>(rhs)];
|
|
|
5488 |
}
|
|
|
5489 |
|
|
|
5490 |
public:
|
|
|
5491 |
/*!
|
|
|
5492 |
@brief comparison: equal
|
|
|
5493 |
|
|
|
5494 |
Compares two JSON values for equality according to the following rules:
|
|
|
5495 |
- Two JSON values are equal if (1) they are from the same type and (2)
|
|
|
5496 |
their stored values are the same.
|
|
|
5497 |
- Integer and floating-point numbers are automatically converted before
|
|
|
5498 |
comparison. Floating-point numbers are compared indirectly: two
|
|
|
5499 |
floating-point numbers `f1` and `f2` are considered equal if neither
|
|
|
5500 |
`f1 > f2` nor `f2 > f1` holds.
|
|
|
5501 |
- Two JSON null values are equal.
|
|
|
5502 |
|
|
|
5503 |
@param[in] lhs first JSON value to consider
|
|
|
5504 |
@param[in] rhs second JSON value to consider
|
|
|
5505 |
@return whether the values @a lhs and @a rhs are equal
|
|
|
5506 |
|
|
|
5507 |
@complexity Linear.
|
|
|
5508 |
|
|
|
5509 |
@liveexample{The example demonstrates comparing several JSON
|
|
|
5510 |
types.,operator__equal}
|
|
|
5511 |
|
|
|
5512 |
@since version 1.0.0
|
|
|
5513 |
*/
|
|
|
5514 |
friend bool operator==(const_reference lhs, const_reference rhs) noexcept
|
|
|
5515 |
{
|
|
|
5516 |
const auto lhs_type = lhs.type();
|
|
|
5517 |
const auto rhs_type = rhs.type();
|
|
|
5518 |
|
|
|
5519 |
if (lhs_type == rhs_type)
|
|
|
5520 |
{
|
|
|
5521 |
switch (lhs_type)
|
|
|
5522 |
{
|
|
|
5523 |
case value_t::array:
|
|
|
5524 |
{
|
|
|
5525 |
return *lhs.m_value.array == *rhs.m_value.array;
|
|
|
5526 |
}
|
|
|
5527 |
case value_t::object:
|
|
|
5528 |
{
|
|
|
5529 |
return *lhs.m_value.object == *rhs.m_value.object;
|
|
|
5530 |
}
|
|
|
5531 |
case value_t::null:
|
|
|
5532 |
{
|
|
|
5533 |
return true;
|
|
|
5534 |
}
|
|
|
5535 |
case value_t::string:
|
|
|
5536 |
{
|
|
|
5537 |
return *lhs.m_value.string == *rhs.m_value.string;
|
|
|
5538 |
}
|
|
|
5539 |
case value_t::boolean:
|
|
|
5540 |
{
|
|
|
5541 |
return lhs.m_value.boolean == rhs.m_value.boolean;
|
|
|
5542 |
}
|
|
|
5543 |
case value_t::number_integer:
|
|
|
5544 |
{
|
|
|
5545 |
return lhs.m_value.number_integer == rhs.m_value.number_integer;
|
|
|
5546 |
}
|
|
|
5547 |
case value_t::number_unsigned:
|
|
|
5548 |
{
|
|
|
5549 |
return lhs.m_value.number_unsigned == rhs.m_value.number_unsigned;
|
|
|
5550 |
}
|
|
|
5551 |
case value_t::number_float:
|
|
|
5552 |
{
|
|
|
5553 |
return lhs.m_value.number_float == rhs.m_value.number_float;
|
|
|
5554 |
}
|
|
|
5555 |
default:
|
|
|
5556 |
{
|
|
|
5557 |
return false;
|
|
|
5558 |
}
|
|
|
5559 |
}
|
|
|
5560 |
}
|
|
|
5561 |
else if (lhs_type == value_t::number_integer and rhs_type == value_t::number_float)
|
|
|
5562 |
{
|
|
|
5563 |
return static_cast<number_float_t>(lhs.m_value.number_integer) == rhs.m_value.number_float;
|
|
|
5564 |
}
|
|
|
5565 |
else if (lhs_type == value_t::number_float and rhs_type == value_t::number_integer)
|
|
|
5566 |
{
|
|
|
5567 |
return lhs.m_value.number_float == static_cast<number_float_t>(rhs.m_value.number_integer);
|
|
|
5568 |
}
|
|
|
5569 |
else if (lhs_type == value_t::number_unsigned and rhs_type == value_t::number_float)
|
|
|
5570 |
{
|
|
|
5571 |
return static_cast<number_float_t>(lhs.m_value.number_unsigned) == rhs.m_value.number_float;
|
|
|
5572 |
}
|
|
|
5573 |
else if (lhs_type == value_t::number_float and rhs_type == value_t::number_unsigned)
|
|
|
5574 |
{
|
|
|
5575 |
return lhs.m_value.number_float == static_cast<number_float_t>(rhs.m_value.number_unsigned);
|
|
|
5576 |
}
|
|
|
5577 |
else if (lhs_type == value_t::number_unsigned and rhs_type == value_t::number_integer)
|
|
|
5578 |
{
|
|
|
5579 |
return static_cast<number_integer_t>(lhs.m_value.number_unsigned) == rhs.m_value.number_integer;
|
|
|
5580 |
}
|
|
|
5581 |
else if (lhs_type == value_t::number_integer and rhs_type == value_t::number_unsigned)
|
|
|
5582 |
{
|
|
|
5583 |
return lhs.m_value.number_integer == static_cast<number_integer_t>(rhs.m_value.number_unsigned);
|
|
|
5584 |
}
|
|
|
5585 |
|
|
|
5586 |
return false;
|
|
|
5587 |
}
|
|
|
5588 |
|
|
|
5589 |
/*!
|
|
|
5590 |
@brief comparison: equal
|
|
|
5591 |
|
|
|
5592 |
The functions compares the given JSON value against a null pointer. As the
|
|
|
5593 |
null pointer can be used to initialize a JSON value to null, a comparison
|
|
|
5594 |
of JSON value @a v with a null pointer should be equivalent to call
|
|
|
5595 |
`v.is_null()`.
|
|
|
5596 |
|
|
|
5597 |
@param[in] v JSON value to consider
|
|
|
5598 |
@return whether @a v is null
|
|
|
5599 |
|
|
|
5600 |
@complexity Constant.
|
|
|
5601 |
|
|
|
5602 |
@liveexample{The example compares several JSON types to the null pointer.
|
|
|
5603 |
,operator__equal__nullptr_t}
|
|
|
5604 |
|
|
|
5605 |
@since version 1.0.0
|
|
|
5606 |
*/
|
|
|
5607 |
friend bool operator==(const_reference v, std::nullptr_t) noexcept
|
|
|
5608 |
{
|
|
|
5609 |
return v.is_null();
|
|
|
5610 |
}
|
|
|
5611 |
|
|
|
5612 |
/*!
|
|
|
5613 |
@brief comparison: equal
|
|
|
5614 |
@copydoc operator==(const_reference, std::nullptr_t)
|
|
|
5615 |
*/
|
|
|
5616 |
friend bool operator==(std::nullptr_t, const_reference v) noexcept
|
|
|
5617 |
{
|
|
|
5618 |
return v.is_null();
|
|
|
5619 |
}
|
|
|
5620 |
|
|
|
5621 |
/*!
|
|
|
5622 |
@brief comparison: not equal
|
|
|
5623 |
|
|
|
5624 |
Compares two JSON values for inequality by calculating `not (lhs == rhs)`.
|
|
|
5625 |
|
|
|
5626 |
@param[in] lhs first JSON value to consider
|
|
|
5627 |
@param[in] rhs second JSON value to consider
|
|
|
5628 |
@return whether the values @a lhs and @a rhs are not equal
|
|
|
5629 |
|
|
|
5630 |
@complexity Linear.
|
|
|
5631 |
|
|
|
5632 |
@liveexample{The example demonstrates comparing several JSON
|
|
|
5633 |
types.,operator__notequal}
|
|
|
5634 |
|
|
|
5635 |
@since version 1.0.0
|
|
|
5636 |
*/
|
|
|
5637 |
friend bool operator!=(const_reference lhs, const_reference rhs) noexcept
|
|
|
5638 |
{
|
|
|
5639 |
return not (lhs == rhs);
|
|
|
5640 |
}
|
|
|
5641 |
|
|
|
5642 |
/*!
|
|
|
5643 |
@brief comparison: not equal
|
|
|
5644 |
|
|
|
5645 |
The functions compares the given JSON value against a null pointer. As the
|
|
|
5646 |
null pointer can be used to initialize a JSON value to null, a comparison
|
|
|
5647 |
of JSON value @a v with a null pointer should be equivalent to call
|
|
|
5648 |
`not v.is_null()`.
|
|
|
5649 |
|
|
|
5650 |
@param[in] v JSON value to consider
|
|
|
5651 |
@return whether @a v is not null
|
|
|
5652 |
|
|
|
5653 |
@complexity Constant.
|
|
|
5654 |
|
|
|
5655 |
@liveexample{The example compares several JSON types to the null pointer.
|
|
|
5656 |
,operator__notequal__nullptr_t}
|
|
|
5657 |
|
|
|
5658 |
@since version 1.0.0
|
|
|
5659 |
*/
|
|
|
5660 |
friend bool operator!=(const_reference v, std::nullptr_t) noexcept
|
|
|
5661 |
{
|
|
|
5662 |
return not v.is_null();
|
|
|
5663 |
}
|
|
|
5664 |
|
|
|
5665 |
/*!
|
|
|
5666 |
@brief comparison: not equal
|
|
|
5667 |
@copydoc operator!=(const_reference, std::nullptr_t)
|
|
|
5668 |
*/
|
|
|
5669 |
friend bool operator!=(std::nullptr_t, const_reference v) noexcept
|
|
|
5670 |
{
|
|
|
5671 |
return not v.is_null();
|
|
|
5672 |
}
|
|
|
5673 |
|
|
|
5674 |
/*!
|
|
|
5675 |
@brief comparison: less than
|
|
|
5676 |
|
|
|
5677 |
Compares whether one JSON value @a lhs is less than another JSON value @a
|
|
|
5678 |
rhs according to the following rules:
|
|
|
5679 |
- If @a lhs and @a rhs have the same type, the values are compared using
|
|
|
5680 |
the default `<` operator.
|
|
|
5681 |
- Integer and floating-point numbers are automatically converted before
|
|
|
5682 |
comparison
|
|
|
5683 |
- In case @a lhs and @a rhs have different types, the values are ignored
|
|
|
5684 |
and the order of the types is considered, see
|
|
|
5685 |
@ref operator<(const value_t, const value_t).
|
|
|
5686 |
|
|
|
5687 |
@param[in] lhs first JSON value to consider
|
|
|
5688 |
@param[in] rhs second JSON value to consider
|
|
|
5689 |
@return whether @a lhs is less than @a rhs
|
|
|
5690 |
|
|
|
5691 |
@complexity Linear.
|
|
|
5692 |
|
|
|
5693 |
@liveexample{The example demonstrates comparing several JSON
|
|
|
5694 |
types.,operator__less}
|
|
|
5695 |
|
|
|
5696 |
@since version 1.0.0
|
|
|
5697 |
*/
|
|
|
5698 |
friend bool operator<(const_reference lhs, const_reference rhs) noexcept
|
|
|
5699 |
{
|
|
|
5700 |
const auto lhs_type = lhs.type();
|
|
|
5701 |
const auto rhs_type = rhs.type();
|
|
|
5702 |
|
|
|
5703 |
if (lhs_type == rhs_type)
|
|
|
5704 |
{
|
|
|
5705 |
switch (lhs_type)
|
|
|
5706 |
{
|
|
|
5707 |
case value_t::array:
|
|
|
5708 |
{
|
|
|
5709 |
return *lhs.m_value.array < *rhs.m_value.array;
|
|
|
5710 |
}
|
|
|
5711 |
case value_t::object:
|
|
|
5712 |
{
|
|
|
5713 |
return *lhs.m_value.object < *rhs.m_value.object;
|
|
|
5714 |
}
|
|
|
5715 |
case value_t::null:
|
|
|
5716 |
{
|
|
|
5717 |
return false;
|
|
|
5718 |
}
|
|
|
5719 |
case value_t::string:
|
|
|
5720 |
{
|
|
|
5721 |
return *lhs.m_value.string < *rhs.m_value.string;
|
|
|
5722 |
}
|
|
|
5723 |
case value_t::boolean:
|
|
|
5724 |
{
|
|
|
5725 |
return lhs.m_value.boolean < rhs.m_value.boolean;
|
|
|
5726 |
}
|
|
|
5727 |
case value_t::number_integer:
|
|
|
5728 |
{
|
|
|
5729 |
return lhs.m_value.number_integer < rhs.m_value.number_integer;
|
|
|
5730 |
}
|
|
|
5731 |
case value_t::number_unsigned:
|
|
|
5732 |
{
|
|
|
5733 |
return lhs.m_value.number_unsigned < rhs.m_value.number_unsigned;
|
|
|
5734 |
}
|
|
|
5735 |
case value_t::number_float:
|
|
|
5736 |
{
|
|
|
5737 |
return lhs.m_value.number_float < rhs.m_value.number_float;
|
|
|
5738 |
}
|
|
|
5739 |
default:
|
|
|
5740 |
{
|
|
|
5741 |
return false;
|
|
|
5742 |
}
|
|
|
5743 |
}
|
|
|
5744 |
}
|
|
|
5745 |
else if (lhs_type == value_t::number_integer and rhs_type == value_t::number_float)
|
|
|
5746 |
{
|
|
|
5747 |
return static_cast<number_float_t>(lhs.m_value.number_integer) < rhs.m_value.number_float;
|
|
|
5748 |
}
|
|
|
5749 |
else if (lhs_type == value_t::number_float and rhs_type == value_t::number_integer)
|
|
|
5750 |
{
|
|
|
5751 |
return lhs.m_value.number_float < static_cast<number_float_t>(rhs.m_value.number_integer);
|
|
|
5752 |
}
|
|
|
5753 |
else if (lhs_type == value_t::number_unsigned and rhs_type == value_t::number_float)
|
|
|
5754 |
{
|
|
|
5755 |
return static_cast<number_float_t>(lhs.m_value.number_unsigned) < rhs.m_value.number_float;
|
|
|
5756 |
}
|
|
|
5757 |
else if (lhs_type == value_t::number_float and rhs_type == value_t::number_unsigned)
|
|
|
5758 |
{
|
|
|
5759 |
return lhs.m_value.number_float < static_cast<number_float_t>(rhs.m_value.number_unsigned);
|
|
|
5760 |
}
|
|
|
5761 |
else if (lhs_type == value_t::number_integer and rhs_type == value_t::number_unsigned)
|
|
|
5762 |
{
|
|
|
5763 |
return lhs.m_value.number_integer < static_cast<number_integer_t>(rhs.m_value.number_unsigned);
|
|
|
5764 |
}
|
|
|
5765 |
else if (lhs_type == value_t::number_unsigned and rhs_type == value_t::number_integer)
|
|
|
5766 |
{
|
|
|
5767 |
return static_cast<number_integer_t>(lhs.m_value.number_unsigned) < rhs.m_value.number_integer;
|
|
|
5768 |
}
|
|
|
5769 |
|
|
|
5770 |
// We only reach this line if we cannot compare values. In that case,
|
|
|
5771 |
// we compare types. Note we have to call the operator explicitly,
|
|
|
5772 |
// because MSVC has problems otherwise.
|
|
|
5773 |
return operator<(lhs_type, rhs_type);
|
|
|
5774 |
}
|
|
|
5775 |
|
|
|
5776 |
/*!
|
|
|
5777 |
@brief comparison: less than or equal
|
|
|
5778 |
|
|
|
5779 |
Compares whether one JSON value @a lhs is less than or equal to another
|
|
|
5780 |
JSON value by calculating `not (rhs < lhs)`.
|
|
|
5781 |
|
|
|
5782 |
@param[in] lhs first JSON value to consider
|
|
|
5783 |
@param[in] rhs second JSON value to consider
|
|
|
5784 |
@return whether @a lhs is less than or equal to @a rhs
|
|
|
5785 |
|
|
|
5786 |
@complexity Linear.
|
|
|
5787 |
|
|
|
5788 |
@liveexample{The example demonstrates comparing several JSON
|
|
|
5789 |
types.,operator__greater}
|
|
|
5790 |
|
|
|
5791 |
@since version 1.0.0
|
|
|
5792 |
*/
|
|
|
5793 |
friend bool operator<=(const_reference lhs, const_reference rhs) noexcept
|
|
|
5794 |
{
|
|
|
5795 |
return not (rhs < lhs);
|
|
|
5796 |
}
|
|
|
5797 |
|
|
|
5798 |
/*!
|
|
|
5799 |
@brief comparison: greater than
|
|
|
5800 |
|
|
|
5801 |
Compares whether one JSON value @a lhs is greater than another
|
|
|
5802 |
JSON value by calculating `not (lhs <= rhs)`.
|
|
|
5803 |
|
|
|
5804 |
@param[in] lhs first JSON value to consider
|
|
|
5805 |
@param[in] rhs second JSON value to consider
|
|
|
5806 |
@return whether @a lhs is greater than to @a rhs
|
|
|
5807 |
|
|
|
5808 |
@complexity Linear.
|
|
|
5809 |
|
|
|
5810 |
@liveexample{The example demonstrates comparing several JSON
|
|
|
5811 |
types.,operator__lessequal}
|
|
|
5812 |
|
|
|
5813 |
@since version 1.0.0
|
|
|
5814 |
*/
|
|
|
5815 |
friend bool operator>(const_reference lhs, const_reference rhs) noexcept
|
|
|
5816 |
{
|
|
|
5817 |
return not (lhs <= rhs);
|
|
|
5818 |
}
|
|
|
5819 |
|
|
|
5820 |
/*!
|
|
|
5821 |
@brief comparison: greater than or equal
|
|
|
5822 |
|
|
|
5823 |
Compares whether one JSON value @a lhs is greater than or equal to another
|
|
|
5824 |
JSON value by calculating `not (lhs < rhs)`.
|
|
|
5825 |
|
|
|
5826 |
@param[in] lhs first JSON value to consider
|
|
|
5827 |
@param[in] rhs second JSON value to consider
|
|
|
5828 |
@return whether @a lhs is greater than or equal to @a rhs
|
|
|
5829 |
|
|
|
5830 |
@complexity Linear.
|
|
|
5831 |
|
|
|
5832 |
@liveexample{The example demonstrates comparing several JSON
|
|
|
5833 |
types.,operator__greaterequal}
|
|
|
5834 |
|
|
|
5835 |
@since version 1.0.0
|
|
|
5836 |
*/
|
|
|
5837 |
friend bool operator>=(const_reference lhs, const_reference rhs) noexcept
|
|
|
5838 |
{
|
|
|
5839 |
return not (lhs < rhs);
|
|
|
5840 |
}
|
|
|
5841 |
|
|
|
5842 |
/// @}
|
|
|
5843 |
|
|
|
5844 |
|
|
|
5845 |
///////////////////
|
|
|
5846 |
// serialization //
|
|
|
5847 |
///////////////////
|
|
|
5848 |
|
|
|
5849 |
/// @name serialization
|
|
|
5850 |
/// @{
|
|
|
5851 |
|
|
|
5852 |
/*!
|
|
|
5853 |
@brief serialize to stream
|
|
|
5854 |
|
|
|
5855 |
Serialize the given JSON value @a j to the output stream @a o. The JSON
|
|
|
5856 |
value will be serialized using the @ref dump member function. The
|
|
|
5857 |
indentation of the output can be controlled with the member variable
|
|
|
5858 |
`width` of the output stream @a o. For instance, using the manipulator
|
|
|
5859 |
`std::setw(4)` on @a o sets the indentation level to `4` and the
|
|
|
5860 |
serialization result is the same as calling `dump(4)`.
|
|
|
5861 |
|
|
|
5862 |
@note During serializaion, the locale and the precision of the output
|
|
|
5863 |
stream @a o are changed. The original values are restored when the
|
|
|
5864 |
function returns.
|
|
|
5865 |
|
|
|
5866 |
@param[in,out] o stream to serialize to
|
|
|
5867 |
@param[in] j JSON value to serialize
|
|
|
5868 |
|
|
|
5869 |
@return the stream @a o
|
|
|
5870 |
|
|
|
5871 |
@complexity Linear.
|
|
|
5872 |
|
|
|
5873 |
@liveexample{The example below shows the serialization with different
|
|
|
5874 |
parameters to `width` to adjust the indentation level.,operator_serialize}
|
|
|
5875 |
|
|
|
5876 |
@since version 1.0.0
|
|
|
5877 |
*/
|
|
|
5878 |
friend std::ostream& operator<<(std::ostream& o, const basic_json& j)
|
|
|
5879 |
{
|
|
|
5880 |
// read width member and use it as indentation parameter if nonzero
|
|
|
5881 |
const bool pretty_print = (o.width() > 0);
|
|
|
5882 |
const auto indentation = (pretty_print ? o.width() : 0);
|
|
|
5883 |
|
|
|
5884 |
// reset width to 0 for subsequent calls to this stream
|
|
|
5885 |
o.width(0);
|
|
|
5886 |
|
|
|
5887 |
// fix locale problems
|
|
|
5888 |
const auto old_locale = o.imbue(std::locale(std::locale(), new DecimalSeparator));
|
|
|
5889 |
// set precision
|
|
|
5890 |
|
|
|
5891 |
// 6, 15 or 16 digits of precision allows round-trip IEEE 754
|
|
|
5892 |
// string->float->string, string->double->string or string->long
|
|
|
5893 |
// double->string; to be safe, we read this value from
|
|
|
5894 |
// std::numeric_limits<number_float_t>::digits10
|
|
|
5895 |
const auto old_precision = o.precision(std::numeric_limits<double>::digits10);
|
|
|
5896 |
|
|
|
5897 |
// do the actual serialization
|
|
|
5898 |
j.dump(o, pretty_print, static_cast<unsigned int>(indentation));
|
|
|
5899 |
|
|
|
5900 |
// reset locale and precision
|
|
|
5901 |
o.imbue(old_locale);
|
|
|
5902 |
o.precision(old_precision);
|
|
|
5903 |
return o;
|
|
|
5904 |
}
|
|
|
5905 |
|
|
|
5906 |
/*!
|
|
|
5907 |
@brief serialize to stream
|
|
|
5908 |
@copydoc operator<<(std::ostream&, const basic_json&)
|
|
|
5909 |
*/
|
|
|
5910 |
friend std::ostream& operator>>(const basic_json& j, std::ostream& o)
|
|
|
5911 |
{
|
|
|
5912 |
return o << j;
|
|
|
5913 |
}
|
|
|
5914 |
|
|
|
5915 |
/// @}
|
|
|
5916 |
|
|
|
5917 |
|
|
|
5918 |
/////////////////////
|
|
|
5919 |
// deserialization //
|
|
|
5920 |
/////////////////////
|
|
|
5921 |
|
|
|
5922 |
/// @name deserialization
|
|
|
5923 |
/// @{
|
|
|
5924 |
|
|
|
5925 |
/*!
|
|
|
5926 |
@brief deserialize from string
|
|
|
5927 |
|
|
|
5928 |
@param[in] s string to read a serialized JSON value from
|
|
|
5929 |
@param[in] cb a parser callback function of type @ref parser_callback_t
|
|
|
5930 |
which is used to control the deserialization by filtering unwanted values
|
|
|
5931 |
(optional)
|
|
|
5932 |
|
|
|
5933 |
@return result of the deserialization
|
|
|
5934 |
|
|
|
5935 |
@complexity Linear in the length of the input. The parser is a predictive
|
|
|
5936 |
LL(1) parser. The complexity can be higher if the parser callback function
|
|
|
5937 |
@a cb has a super-linear complexity.
|
|
|
5938 |
|
|
|
5939 |
@note A UTF-8 byte order mark is silently ignored.
|
|
|
5940 |
|
|
|
5941 |
@liveexample{The example below demonstrates the `parse()` function with
|
|
|
5942 |
and without callback function.,parse__string__parser_callback_t}
|
|
|
5943 |
|
|
|
5944 |
@sa @ref parse(std::istream&, const parser_callback_t) for a version that
|
|
|
5945 |
reads from an input stream
|
|
|
5946 |
|
|
|
5947 |
@since version 1.0.0
|
|
|
5948 |
*/
|
|
|
5949 |
static basic_json parse(const string_t& s,
|
|
|
5950 |
const parser_callback_t cb = nullptr)
|
|
|
5951 |
{
|
|
|
5952 |
return parser(s, cb).parse();
|
|
|
5953 |
}
|
|
|
5954 |
|
|
|
5955 |
/*!
|
|
|
5956 |
@brief deserialize from stream
|
|
|
5957 |
|
|
|
5958 |
@param[in,out] i stream to read a serialized JSON value from
|
|
|
5959 |
@param[in] cb a parser callback function of type @ref parser_callback_t
|
|
|
5960 |
which is used to control the deserialization by filtering unwanted values
|
|
|
5961 |
(optional)
|
|
|
5962 |
|
|
|
5963 |
@return result of the deserialization
|
|
|
5964 |
|
|
|
5965 |
@complexity Linear in the length of the input. The parser is a predictive
|
|
|
5966 |
LL(1) parser. The complexity can be higher if the parser callback function
|
|
|
5967 |
@a cb has a super-linear complexity.
|
|
|
5968 |
|
|
|
5969 |
@note A UTF-8 byte order mark is silently ignored.
|
|
|
5970 |
|
|
|
5971 |
@liveexample{The example below demonstrates the `parse()` function with
|
|
|
5972 |
and without callback function.,parse__istream__parser_callback_t}
|
|
|
5973 |
|
|
|
5974 |
@sa @ref parse(const string_t&, const parser_callback_t) for a version
|
|
|
5975 |
that reads from a string
|
|
|
5976 |
|
|
|
5977 |
@since version 1.0.0
|
|
|
5978 |
*/
|
|
|
5979 |
static basic_json parse(std::istream& i,
|
|
|
5980 |
const parser_callback_t cb = nullptr)
|
|
|
5981 |
{
|
|
|
5982 |
return parser(i, cb).parse();
|
|
|
5983 |
}
|
|
|
5984 |
|
|
|
5985 |
/*!
|
|
|
5986 |
@copydoc parse(std::istream&, const parser_callback_t)
|
|
|
5987 |
*/
|
|
|
5988 |
static basic_json parse(std::istream&& i,
|
|
|
5989 |
const parser_callback_t cb = nullptr)
|
|
|
5990 |
{
|
|
|
5991 |
return parser(i, cb).parse();
|
|
|
5992 |
}
|
|
|
5993 |
|
|
|
5994 |
/*!
|
|
|
5995 |
@brief deserialize from stream
|
|
|
5996 |
|
|
|
5997 |
Deserializes an input stream to a JSON value.
|
|
|
5998 |
|
|
|
5999 |
@param[in,out] i input stream to read a serialized JSON value from
|
|
|
6000 |
@param[in,out] j JSON value to write the deserialized input to
|
|
|
6001 |
|
|
|
6002 |
@throw std::invalid_argument in case of parse errors
|
|
|
6003 |
|
|
|
6004 |
@complexity Linear in the length of the input. The parser is a predictive
|
|
|
6005 |
LL(1) parser.
|
|
|
6006 |
|
|
|
6007 |
@note A UTF-8 byte order mark is silently ignored.
|
|
|
6008 |
|
|
|
6009 |
@liveexample{The example below shows how a JSON value is constructed by
|
|
|
6010 |
reading a serialization from a stream.,operator_deserialize}
|
|
|
6011 |
|
|
|
6012 |
@sa parse(std::istream&, const parser_callback_t) for a variant with a
|
|
|
6013 |
parser callback function to filter values while parsing
|
|
|
6014 |
|
|
|
6015 |
@since version 1.0.0
|
|
|
6016 |
*/
|
|
|
6017 |
friend std::istream& operator<<(basic_json& j, std::istream& i)
|
|
|
6018 |
{
|
|
|
6019 |
j = parser(i).parse();
|
|
|
6020 |
return i;
|
|
|
6021 |
}
|
|
|
6022 |
|
|
|
6023 |
/*!
|
|
|
6024 |
@brief deserialize from stream
|
|
|
6025 |
@copydoc operator<<(basic_json&, std::istream&)
|
|
|
6026 |
*/
|
|
|
6027 |
friend std::istream& operator>>(std::istream& i, basic_json& j)
|
|
|
6028 |
{
|
|
|
6029 |
j = parser(i).parse();
|
|
|
6030 |
return i;
|
|
|
6031 |
}
|
|
|
6032 |
|
|
|
6033 |
/// @}
|
|
|
6034 |
|
|
|
6035 |
|
|
|
6036 |
private:
|
|
|
6037 |
///////////////////////////
|
|
|
6038 |
// convenience functions //
|
|
|
6039 |
///////////////////////////
|
|
|
6040 |
|
|
|
6041 |
/*!
|
|
|
6042 |
@brief return the type as string
|
|
|
6043 |
|
|
|
6044 |
Returns the type name as string to be used in error messages - usually to
|
|
|
6045 |
indicate that a function was called on a wrong JSON type.
|
|
|
6046 |
|
|
|
6047 |
@return basically a string representation of a the @ref m_type member
|
|
|
6048 |
|
|
|
6049 |
@complexity Constant.
|
|
|
6050 |
|
|
|
6051 |
@since version 1.0.0
|
|
|
6052 |
*/
|
|
|
6053 |
std::string type_name() const
|
|
|
6054 |
{
|
|
|
6055 |
switch (m_type)
|
|
|
6056 |
{
|
|
|
6057 |
case value_t::null:
|
|
|
6058 |
return "null";
|
|
|
6059 |
case value_t::object:
|
|
|
6060 |
return "object";
|
|
|
6061 |
case value_t::array:
|
|
|
6062 |
return "array";
|
|
|
6063 |
case value_t::string:
|
|
|
6064 |
return "string";
|
|
|
6065 |
case value_t::boolean:
|
|
|
6066 |
return "boolean";
|
|
|
6067 |
case value_t::discarded:
|
|
|
6068 |
return "discarded";
|
|
|
6069 |
default:
|
|
|
6070 |
return "number";
|
|
|
6071 |
}
|
|
|
6072 |
}
|
|
|
6073 |
|
|
|
6074 |
/*!
|
|
|
6075 |
@brief calculates the extra space to escape a JSON string
|
|
|
6076 |
|
|
|
6077 |
@param[in] s the string to escape
|
|
|
6078 |
@return the number of characters required to escape string @a s
|
|
|
6079 |
|
|
|
6080 |
@complexity Linear in the length of string @a s.
|
|
|
6081 |
*/
|
|
|
6082 |
static std::size_t extra_space(const string_t& s) noexcept
|
|
|
6083 |
{
|
|
|
6084 |
return std::accumulate(s.begin(), s.end(), size_t{},
|
|
|
6085 |
[](size_t res, typename string_t::value_type c)
|
|
|
6086 |
{
|
|
|
6087 |
switch (c)
|
|
|
6088 |
{
|
|
|
6089 |
case '"':
|
|
|
6090 |
case '\\':
|
|
|
6091 |
case '\b':
|
|
|
6092 |
case '\f':
|
|
|
6093 |
case '\n':
|
|
|
6094 |
case '\r':
|
|
|
6095 |
case '\t':
|
|
|
6096 |
{
|
|
|
6097 |
// from c (1 byte) to \x (2 bytes)
|
|
|
6098 |
return res + 1;
|
|
|
6099 |
}
|
|
|
6100 |
|
|
|
6101 |
default:
|
|
|
6102 |
{
|
|
|
6103 |
if (c >= 0x00 and c <= 0x1f)
|
|
|
6104 |
{
|
|
|
6105 |
// from c (1 byte) to \uxxxx (6 bytes)
|
|
|
6106 |
return res + 5;
|
|
|
6107 |
}
|
|
|
6108 |
else
|
|
|
6109 |
{
|
|
|
6110 |
return res;
|
|
|
6111 |
}
|
|
|
6112 |
}
|
|
|
6113 |
}
|
|
|
6114 |
});
|
|
|
6115 |
}
|
|
|
6116 |
|
|
|
6117 |
/*!
|
|
|
6118 |
@brief escape a string
|
|
|
6119 |
|
|
|
6120 |
Escape a string by replacing certain special characters by a sequence of
|
|
|
6121 |
an escape character (backslash) and another character and other control
|
|
|
6122 |
characters by a sequence of "\u" followed by a four-digit hex
|
|
|
6123 |
representation.
|
|
|
6124 |
|
|
|
6125 |
@param[in] s the string to escape
|
|
|
6126 |
@return the escaped string
|
|
|
6127 |
|
|
|
6128 |
@complexity Linear in the length of string @a s.
|
|
|
6129 |
*/
|
|
|
6130 |
static string_t escape_string(const string_t& s)
|
|
|
6131 |
{
|
|
|
6132 |
const auto space = extra_space(s);
|
|
|
6133 |
if (space == 0)
|
|
|
6134 |
{
|
|
|
6135 |
return s;
|
|
|
6136 |
}
|
|
|
6137 |
|
|
|
6138 |
// create a result string of necessary size
|
|
|
6139 |
string_t result(s.size() + space, '\\');
|
|
|
6140 |
std::size_t pos = 0;
|
|
|
6141 |
|
|
|
6142 |
for (const auto& c : s)
|
|
|
6143 |
{
|
|
|
6144 |
switch (c)
|
|
|
6145 |
{
|
|
|
6146 |
// quotation mark (0x22)
|
|
|
6147 |
case '"':
|
|
|
6148 |
{
|
|
|
6149 |
result[pos + 1] = '"';
|
|
|
6150 |
pos += 2;
|
|
|
6151 |
break;
|
|
|
6152 |
}
|
|
|
6153 |
|
|
|
6154 |
// reverse solidus (0x5c)
|
|
|
6155 |
case '\\':
|
|
|
6156 |
{
|
|
|
6157 |
// nothing to change
|
|
|
6158 |
pos += 2;
|
|
|
6159 |
break;
|
|
|
6160 |
}
|
|
|
6161 |
|
|
|
6162 |
// backspace (0x08)
|
|
|
6163 |
case '\b':
|
|
|
6164 |
{
|
|
|
6165 |
result[pos + 1] = 'b';
|
|
|
6166 |
pos += 2;
|
|
|
6167 |
break;
|
|
|
6168 |
}
|
|
|
6169 |
|
|
|
6170 |
// formfeed (0x0c)
|
|
|
6171 |
case '\f':
|
|
|
6172 |
{
|
|
|
6173 |
result[pos + 1] = 'f';
|
|
|
6174 |
pos += 2;
|
|
|
6175 |
break;
|
|
|
6176 |
}
|
|
|
6177 |
|
|
|
6178 |
// newline (0x0a)
|
|
|
6179 |
case '\n':
|
|
|
6180 |
{
|
|
|
6181 |
result[pos + 1] = 'n';
|
|
|
6182 |
pos += 2;
|
|
|
6183 |
break;
|
|
|
6184 |
}
|
|
|
6185 |
|
|
|
6186 |
// carriage return (0x0d)
|
|
|
6187 |
case '\r':
|
|
|
6188 |
{
|
|
|
6189 |
result[pos + 1] = 'r';
|
|
|
6190 |
pos += 2;
|
|
|
6191 |
break;
|
|
|
6192 |
}
|
|
|
6193 |
|
|
|
6194 |
// horizontal tab (0x09)
|
|
|
6195 |
case '\t':
|
|
|
6196 |
{
|
|
|
6197 |
result[pos + 1] = 't';
|
|
|
6198 |
pos += 2;
|
|
|
6199 |
break;
|
|
|
6200 |
}
|
|
|
6201 |
|
|
|
6202 |
default:
|
|
|
6203 |
{
|
|
|
6204 |
if (c >= 0x00 and c <= 0x1f)
|
|
|
6205 |
{
|
|
|
6206 |
// convert a number 0..15 to its hex representation
|
|
|
6207 |
// (0..f)
|
|
|
6208 |
static const char hexify[16] =
|
|
|
6209 |
{
|
|
|
6210 |
'0', '1', '2', '3', '4', '5', '6', '7',
|
|
|
6211 |
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
|
|
|
6212 |
};
|
|
|
6213 |
|
|
|
6214 |
// print character c as \uxxxx
|
|
|
6215 |
for (const char m :
|
|
|
6216 |
{ 'u', '0', '0', hexify[c >> 4], hexify[c & 0x0f]
|
|
|
6217 |
})
|
|
|
6218 |
{
|
|
|
6219 |
result[++pos] = m;
|
|
|
6220 |
}
|
|
|
6221 |
|
|
|
6222 |
++pos;
|
|
|
6223 |
}
|
|
|
6224 |
else
|
|
|
6225 |
{
|
|
|
6226 |
// all other characters are added as-is
|
|
|
6227 |
result[pos++] = c;
|
|
|
6228 |
}
|
|
|
6229 |
break;
|
|
|
6230 |
}
|
|
|
6231 |
}
|
|
|
6232 |
}
|
|
|
6233 |
|
|
|
6234 |
return result;
|
|
|
6235 |
}
|
|
|
6236 |
|
|
|
6237 |
/*!
|
|
|
6238 |
@brief internal implementation of the serialization function
|
|
|
6239 |
|
|
|
6240 |
This function is called by the public member function dump and organizes
|
|
|
6241 |
the serialization internally. The indentation level is propagated as
|
|
|
6242 |
additional parameter. In case of arrays and objects, the function is
|
|
|
6243 |
called recursively. Note that
|
|
|
6244 |
|
|
|
6245 |
- strings and object keys are escaped using `escape_string()`
|
|
|
6246 |
- integer numbers are converted implicitly via `operator<<`
|
|
|
6247 |
- floating-point numbers are converted to a string using `"%g"` format
|
|
|
6248 |
|
|
|
6249 |
@param[out] o stream to write to
|
|
|
6250 |
@param[in] pretty_print whether the output shall be pretty-printed
|
|
|
6251 |
@param[in] indent_step the indent level
|
|
|
6252 |
@param[in] current_indent the current indent level (only used internally)
|
|
|
6253 |
*/
|
|
|
6254 |
void dump(std::ostream& o,
|
|
|
6255 |
const bool pretty_print,
|
|
|
6256 |
const unsigned int indent_step,
|
|
|
6257 |
const unsigned int current_indent = 0) const
|
|
|
6258 |
{
|
|
|
6259 |
// variable to hold indentation for recursive calls
|
|
|
6260 |
unsigned int new_indent = current_indent;
|
|
|
6261 |
|
|
|
6262 |
switch (m_type)
|
|
|
6263 |
{
|
|
|
6264 |
case value_t::object:
|
|
|
6265 |
{
|
|
|
6266 |
if (m_value.object->empty())
|
|
|
6267 |
{
|
|
|
6268 |
o << "{}";
|
|
|
6269 |
return;
|
|
|
6270 |
}
|
|
|
6271 |
|
|
|
6272 |
o << "{";
|
|
|
6273 |
|
|
|
6274 |
// increase indentation
|
|
|
6275 |
if (pretty_print)
|
|
|
6276 |
{
|
|
|
6277 |
new_indent += indent_step;
|
|
|
6278 |
o << "\n";
|
|
|
6279 |
}
|
|
|
6280 |
|
|
|
6281 |
for (auto i = m_value.object->cbegin(); i != m_value.object->cend(); ++i)
|
|
|
6282 |
{
|
|
|
6283 |
if (i != m_value.object->cbegin())
|
|
|
6284 |
{
|
|
|
6285 |
o << (pretty_print ? ",\n" : ",");
|
|
|
6286 |
}
|
|
|
6287 |
o << string_t(new_indent, ' ') << "\""
|
|
|
6288 |
<< escape_string(i->first) << "\":"
|
|
|
6289 |
<< (pretty_print ? " " : "");
|
|
|
6290 |
i->second.dump(o, pretty_print, indent_step, new_indent);
|
|
|
6291 |
}
|
|
|
6292 |
|
|
|
6293 |
// decrease indentation
|
|
|
6294 |
if (pretty_print)
|
|
|
6295 |
{
|
|
|
6296 |
new_indent -= indent_step;
|
|
|
6297 |
o << "\n";
|
|
|
6298 |
}
|
|
|
6299 |
|
|
|
6300 |
o << string_t(new_indent, ' ') + "}";
|
|
|
6301 |
return;
|
|
|
6302 |
}
|
|
|
6303 |
|
|
|
6304 |
case value_t::array:
|
|
|
6305 |
{
|
|
|
6306 |
if (m_value.array->empty())
|
|
|
6307 |
{
|
|
|
6308 |
o << "[]";
|
|
|
6309 |
return;
|
|
|
6310 |
}
|
|
|
6311 |
|
|
|
6312 |
o << "[";
|
|
|
6313 |
|
|
|
6314 |
// increase indentation
|
|
|
6315 |
if (pretty_print)
|
|
|
6316 |
{
|
|
|
6317 |
new_indent += indent_step;
|
|
|
6318 |
o << "\n";
|
|
|
6319 |
}
|
|
|
6320 |
|
|
|
6321 |
for (auto i = m_value.array->cbegin(); i != m_value.array->cend(); ++i)
|
|
|
6322 |
{
|
|
|
6323 |
if (i != m_value.array->cbegin())
|
|
|
6324 |
{
|
|
|
6325 |
o << (pretty_print ? ",\n" : ",");
|
|
|
6326 |
}
|
|
|
6327 |
o << string_t(new_indent, ' ');
|
|
|
6328 |
i->dump(o, pretty_print, indent_step, new_indent);
|
|
|
6329 |
}
|
|
|
6330 |
|
|
|
6331 |
// decrease indentation
|
|
|
6332 |
if (pretty_print)
|
|
|
6333 |
{
|
|
|
6334 |
new_indent -= indent_step;
|
|
|
6335 |
o << "\n";
|
|
|
6336 |
}
|
|
|
6337 |
|
|
|
6338 |
o << string_t(new_indent, ' ') << "]";
|
|
|
6339 |
return;
|
|
|
6340 |
}
|
|
|
6341 |
|
|
|
6342 |
case value_t::string:
|
|
|
6343 |
{
|
|
|
6344 |
o << string_t("\"") << escape_string(*m_value.string) << "\"";
|
|
|
6345 |
return;
|
|
|
6346 |
}
|
|
|
6347 |
|
|
|
6348 |
case value_t::boolean:
|
|
|
6349 |
{
|
|
|
6350 |
o << (m_value.boolean ? "true" : "false");
|
|
|
6351 |
return;
|
|
|
6352 |
}
|
|
|
6353 |
|
|
|
6354 |
case value_t::number_integer:
|
|
|
6355 |
{
|
|
|
6356 |
o << m_value.number_integer;
|
|
|
6357 |
return;
|
|
|
6358 |
}
|
|
|
6359 |
|
|
|
6360 |
case value_t::number_unsigned:
|
|
|
6361 |
{
|
|
|
6362 |
o << m_value.number_unsigned;
|
|
|
6363 |
return;
|
|
|
6364 |
}
|
|
|
6365 |
|
|
|
6366 |
case value_t::number_float:
|
|
|
6367 |
{
|
|
|
6368 |
if (m_value.number_float == 0)
|
|
|
6369 |
{
|
|
|
6370 |
// special case for zero to get "0.0"/"-0.0"
|
|
|
6371 |
o << (std::signbit(m_value.number_float) ? "-0.0" : "0.0");
|
|
|
6372 |
}
|
|
|
6373 |
else
|
|
|
6374 |
{
|
|
|
6375 |
o << m_value.number_float;
|
|
|
6376 |
}
|
|
|
6377 |
return;
|
|
|
6378 |
}
|
|
|
6379 |
|
|
|
6380 |
case value_t::discarded:
|
|
|
6381 |
{
|
|
|
6382 |
o << "<discarded>";
|
|
|
6383 |
return;
|
|
|
6384 |
}
|
|
|
6385 |
|
|
|
6386 |
case value_t::null:
|
|
|
6387 |
{
|
|
|
6388 |
o << "null";
|
|
|
6389 |
return;
|
|
|
6390 |
}
|
|
|
6391 |
}
|
|
|
6392 |
}
|
|
|
6393 |
|
|
|
6394 |
private:
|
|
|
6395 |
//////////////////////
|
|
|
6396 |
// member variables //
|
|
|
6397 |
//////////////////////
|
|
|
6398 |
|
|
|
6399 |
/// the type of the current element
|
|
|
6400 |
value_t m_type = value_t::null;
|
|
|
6401 |
|
|
|
6402 |
/// the value of the current element
|
|
|
6403 |
json_value m_value = {};
|
|
|
6404 |
|
|
|
6405 |
|
|
|
6406 |
private:
|
|
|
6407 |
///////////////
|
|
|
6408 |
// iterators //
|
|
|
6409 |
///////////////
|
|
|
6410 |
|
|
|
6411 |
/*!
|
|
|
6412 |
@brief an iterator for primitive JSON types
|
|
|
6413 |
|
|
|
6414 |
This class models an iterator for primitive JSON types (boolean, number,
|
|
|
6415 |
string). It's only purpose is to allow the iterator/const_iterator classes
|
|
|
6416 |
to "iterate" over primitive values. Internally, the iterator is modeled by
|
|
|
6417 |
a `difference_type` variable. Value begin_value (`0`) models the begin,
|
|
|
6418 |
end_value (`1`) models past the end.
|
|
|
6419 |
*/
|
|
|
6420 |
class primitive_iterator_t
|
|
|
6421 |
{
|
|
|
6422 |
public:
|
|
|
6423 |
/// set iterator to a defined beginning
|
|
|
6424 |
void set_begin() noexcept
|
|
|
6425 |
{
|
|
|
6426 |
m_it = begin_value;
|
|
|
6427 |
}
|
|
|
6428 |
|
|
|
6429 |
/// set iterator to a defined past the end
|
|
|
6430 |
void set_end() noexcept
|
|
|
6431 |
{
|
|
|
6432 |
m_it = end_value;
|
|
|
6433 |
}
|
|
|
6434 |
|
|
|
6435 |
/// return whether the iterator can be dereferenced
|
|
|
6436 |
constexpr bool is_begin() const noexcept
|
|
|
6437 |
{
|
|
|
6438 |
return (m_it == begin_value);
|
|
|
6439 |
}
|
|
|
6440 |
|
|
|
6441 |
/// return whether the iterator is at end
|
|
|
6442 |
constexpr bool is_end() const noexcept
|
|
|
6443 |
{
|
|
|
6444 |
return (m_it == end_value);
|
|
|
6445 |
}
|
|
|
6446 |
|
|
|
6447 |
/// return reference to the value to change and compare
|
|
|
6448 |
operator difference_type& () noexcept
|
|
|
6449 |
{
|
|
|
6450 |
return m_it;
|
|
|
6451 |
}
|
|
|
6452 |
|
|
|
6453 |
/// return value to compare
|
|
|
6454 |
constexpr operator difference_type () const noexcept
|
|
|
6455 |
{
|
|
|
6456 |
return m_it;
|
|
|
6457 |
}
|
|
|
6458 |
|
|
|
6459 |
private:
|
|
|
6460 |
static constexpr difference_type begin_value = 0;
|
|
|
6461 |
static constexpr difference_type end_value = begin_value + 1;
|
|
|
6462 |
|
|
|
6463 |
/// iterator as signed integer type
|
|
|
6464 |
difference_type m_it = std::numeric_limits<std::ptrdiff_t>::denorm_min();
|
|
|
6465 |
};
|
|
|
6466 |
|
|
|
6467 |
/*!
|
|
|
6468 |
@brief an iterator value
|
|
|
6469 |
|
|
|
6470 |
@note This structure could easily be a union, but MSVC currently does not
|
|
|
6471 |
allow unions members with complex constructors, see
|
|
|
6472 |
https://github.com/nlohmann/json/pull/105.
|
|
|
6473 |
*/
|
|
|
6474 |
struct internal_iterator
|
|
|
6475 |
{
|
|
|
6476 |
/// iterator for JSON objects
|
|
|
6477 |
typename object_t::iterator object_iterator;
|
|
|
6478 |
/// iterator for JSON arrays
|
|
|
6479 |
typename array_t::iterator array_iterator;
|
|
|
6480 |
/// generic iterator for all other types
|
|
|
6481 |
primitive_iterator_t primitive_iterator;
|
|
|
6482 |
|
|
|
6483 |
/// create an uninitialized internal_iterator
|
|
|
6484 |
internal_iterator() noexcept
|
|
|
6485 |
: object_iterator(), array_iterator(), primitive_iterator()
|
|
|
6486 |
{}
|
|
|
6487 |
};
|
|
|
6488 |
|
|
|
6489 |
/// proxy class for the iterator_wrapper functions
|
|
|
6490 |
template<typename IteratorType>
|
|
|
6491 |
class iteration_proxy
|
|
|
6492 |
{
|
|
|
6493 |
private:
|
|
|
6494 |
/// helper class for iteration
|
|
|
6495 |
class iteration_proxy_internal
|
|
|
6496 |
{
|
|
|
6497 |
private:
|
|
|
6498 |
/// the iterator
|
|
|
6499 |
IteratorType anchor;
|
|
|
6500 |
/// an index for arrays (used to create key names)
|
|
|
6501 |
size_t array_index = 0;
|
|
|
6502 |
|
|
|
6503 |
public:
|
|
|
6504 |
explicit iteration_proxy_internal(IteratorType it) noexcept
|
|
|
6505 |
: anchor(it)
|
|
|
6506 |
{}
|
|
|
6507 |
|
|
|
6508 |
/// dereference operator (needed for range-based for)
|
|
|
6509 |
iteration_proxy_internal& operator*()
|
|
|
6510 |
{
|
|
|
6511 |
return *this;
|
|
|
6512 |
}
|
|
|
6513 |
|
|
|
6514 |
/// increment operator (needed for range-based for)
|
|
|
6515 |
iteration_proxy_internal& operator++()
|
|
|
6516 |
{
|
|
|
6517 |
++anchor;
|
|
|
6518 |
++array_index;
|
|
|
6519 |
|
|
|
6520 |
return *this;
|
|
|
6521 |
}
|
|
|
6522 |
|
|
|
6523 |
/// inequality operator (needed for range-based for)
|
|
|
6524 |
bool operator!= (const iteration_proxy_internal& o) const
|
|
|
6525 |
{
|
|
|
6526 |
return anchor != o.anchor;
|
|
|
6527 |
}
|
|
|
6528 |
|
|
|
6529 |
/// return key of the iterator
|
|
|
6530 |
typename basic_json::string_t key() const
|
|
|
6531 |
{
|
|
|
6532 |
assert(anchor.m_object != nullptr);
|
|
|
6533 |
|
|
|
6534 |
switch (anchor.m_object->type())
|
|
|
6535 |
{
|
|
|
6536 |
// use integer array index as key
|
|
|
6537 |
case value_t::array:
|
|
|
6538 |
{
|
|
|
6539 |
return std::to_string(array_index);
|
|
|
6540 |
}
|
|
|
6541 |
|
|
|
6542 |
// use key from the object
|
|
|
6543 |
case value_t::object:
|
|
|
6544 |
{
|
|
|
6545 |
return anchor.key();
|
|
|
6546 |
}
|
|
|
6547 |
|
|
|
6548 |
// use an empty key for all primitive types
|
|
|
6549 |
default:
|
|
|
6550 |
{
|
|
|
6551 |
return "";
|
|
|
6552 |
}
|
|
|
6553 |
}
|
|
|
6554 |
}
|
|
|
6555 |
|
|
|
6556 |
/// return value of the iterator
|
|
|
6557 |
typename IteratorType::reference value() const
|
|
|
6558 |
{
|
|
|
6559 |
return anchor.value();
|
|
|
6560 |
}
|
|
|
6561 |
};
|
|
|
6562 |
|
|
|
6563 |
/// the container to iterate
|
|
|
6564 |
typename IteratorType::reference container;
|
|
|
6565 |
|
|
|
6566 |
public:
|
|
|
6567 |
/// construct iteration proxy from a container
|
|
|
6568 |
explicit iteration_proxy(typename IteratorType::reference cont)
|
|
|
6569 |
: container(cont)
|
|
|
6570 |
{}
|
|
|
6571 |
|
|
|
6572 |
/// return iterator begin (needed for range-based for)
|
|
|
6573 |
iteration_proxy_internal begin() noexcept
|
|
|
6574 |
{
|
|
|
6575 |
return iteration_proxy_internal(container.begin());
|
|
|
6576 |
}
|
|
|
6577 |
|
|
|
6578 |
/// return iterator end (needed for range-based for)
|
|
|
6579 |
iteration_proxy_internal end() noexcept
|
|
|
6580 |
{
|
|
|
6581 |
return iteration_proxy_internal(container.end());
|
|
|
6582 |
}
|
|
|
6583 |
};
|
|
|
6584 |
|
|
|
6585 |
public:
|
|
|
6586 |
/*!
|
|
|
6587 |
@brief a const random access iterator for the @ref basic_json class
|
|
|
6588 |
|
|
|
6589 |
This class implements a const iterator for the @ref basic_json class. From
|
|
|
6590 |
this class, the @ref iterator class is derived.
|
|
|
6591 |
|
|
|
6592 |
@note An iterator is called *initialized* when a pointer to a JSON value
|
|
|
6593 |
has been set (e.g., by a constructor or a copy assignment). If the
|
|
|
6594 |
iterator is default-constructed, it is *uninitialized* and most
|
|
|
6595 |
methods are undefined. The library uses assertions to detect calls
|
|
|
6596 |
on uninitialized iterators.
|
|
|
6597 |
|
|
|
6598 |
@requirement The class satisfies the following concept requirements:
|
|
|
6599 |
- [RandomAccessIterator](http://en.cppreference.com/w/cpp/concept/RandomAccessIterator):
|
|
|
6600 |
The iterator that can be moved to point (forward and backward) to any
|
|
|
6601 |
element in constant time.
|
|
|
6602 |
|
|
|
6603 |
@since version 1.0.0
|
|
|
6604 |
*/
|
|
|
6605 |
class const_iterator : public std::iterator<std::random_access_iterator_tag, const basic_json>
|
|
|
6606 |
{
|
|
|
6607 |
/// allow basic_json to access private members
|
|
|
6608 |
friend class basic_json;
|
|
|
6609 |
|
|
|
6610 |
public:
|
|
|
6611 |
/// the type of the values when the iterator is dereferenced
|
|
|
6612 |
using value_type = typename basic_json::value_type;
|
|
|
6613 |
/// a type to represent differences between iterators
|
|
|
6614 |
using difference_type = typename basic_json::difference_type;
|
|
|
6615 |
/// defines a pointer to the type iterated over (value_type)
|
|
|
6616 |
using pointer = typename basic_json::const_pointer;
|
|
|
6617 |
/// defines a reference to the type iterated over (value_type)
|
|
|
6618 |
using reference = typename basic_json::const_reference;
|
|
|
6619 |
/// the category of the iterator
|
|
|
6620 |
using iterator_category = std::bidirectional_iterator_tag;
|
|
|
6621 |
|
|
|
6622 |
/// default constructor
|
|
|
6623 |
const_iterator() = default;
|
|
|
6624 |
|
|
|
6625 |
/*!
|
|
|
6626 |
@brief constructor for a given JSON instance
|
|
|
6627 |
@param[in] object pointer to a JSON object for this iterator
|
|
|
6628 |
@pre object != nullptr
|
|
|
6629 |
@post The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6630 |
*/
|
|
|
6631 |
explicit const_iterator(pointer object) noexcept
|
|
|
6632 |
: m_object(object)
|
|
|
6633 |
{
|
|
|
6634 |
assert(m_object != nullptr);
|
|
|
6635 |
|
|
|
6636 |
switch (m_object->m_type)
|
|
|
6637 |
{
|
|
|
6638 |
case basic_json::value_t::object:
|
|
|
6639 |
{
|
|
|
6640 |
m_it.object_iterator = typename object_t::iterator();
|
|
|
6641 |
break;
|
|
|
6642 |
}
|
|
|
6643 |
|
|
|
6644 |
case basic_json::value_t::array:
|
|
|
6645 |
{
|
|
|
6646 |
m_it.array_iterator = typename array_t::iterator();
|
|
|
6647 |
break;
|
|
|
6648 |
}
|
|
|
6649 |
|
|
|
6650 |
default:
|
|
|
6651 |
{
|
|
|
6652 |
m_it.primitive_iterator = primitive_iterator_t();
|
|
|
6653 |
break;
|
|
|
6654 |
}
|
|
|
6655 |
}
|
|
|
6656 |
}
|
|
|
6657 |
|
|
|
6658 |
/*!
|
|
|
6659 |
@brief copy constructor given a non-const iterator
|
|
|
6660 |
@param[in] other iterator to copy from
|
|
|
6661 |
@note It is not checked whether @a other is initialized.
|
|
|
6662 |
*/
|
|
|
6663 |
explicit const_iterator(const iterator& other) noexcept
|
|
|
6664 |
: m_object(other.m_object)
|
|
|
6665 |
{
|
|
|
6666 |
if (m_object != nullptr)
|
|
|
6667 |
{
|
|
|
6668 |
switch (m_object->m_type)
|
|
|
6669 |
{
|
|
|
6670 |
case basic_json::value_t::object:
|
|
|
6671 |
{
|
|
|
6672 |
m_it.object_iterator = other.m_it.object_iterator;
|
|
|
6673 |
break;
|
|
|
6674 |
}
|
|
|
6675 |
|
|
|
6676 |
case basic_json::value_t::array:
|
|
|
6677 |
{
|
|
|
6678 |
m_it.array_iterator = other.m_it.array_iterator;
|
|
|
6679 |
break;
|
|
|
6680 |
}
|
|
|
6681 |
|
|
|
6682 |
default:
|
|
|
6683 |
{
|
|
|
6684 |
m_it.primitive_iterator = other.m_it.primitive_iterator;
|
|
|
6685 |
break;
|
|
|
6686 |
}
|
|
|
6687 |
}
|
|
|
6688 |
}
|
|
|
6689 |
}
|
|
|
6690 |
|
|
|
6691 |
/*!
|
|
|
6692 |
@brief copy constructor
|
|
|
6693 |
@param[in] other iterator to copy from
|
|
|
6694 |
@note It is not checked whether @a other is initialized.
|
|
|
6695 |
*/
|
|
|
6696 |
const_iterator(const const_iterator& other) noexcept
|
|
|
6697 |
: m_object(other.m_object), m_it(other.m_it)
|
|
|
6698 |
{}
|
|
|
6699 |
|
|
|
6700 |
/*!
|
|
|
6701 |
@brief copy assignment
|
|
|
6702 |
@param[in,out] other iterator to copy from
|
|
|
6703 |
@note It is not checked whether @a other is initialized.
|
|
|
6704 |
*/
|
|
|
6705 |
const_iterator& operator=(const_iterator other) noexcept(
|
|
|
6706 |
std::is_nothrow_move_constructible<pointer>::value and
|
|
|
6707 |
std::is_nothrow_move_assignable<pointer>::value and
|
|
|
6708 |
std::is_nothrow_move_constructible<internal_iterator>::value and
|
|
|
6709 |
std::is_nothrow_move_assignable<internal_iterator>::value
|
|
|
6710 |
)
|
|
|
6711 |
{
|
|
|
6712 |
std::swap(m_object, other.m_object);
|
|
|
6713 |
std::swap(m_it, other.m_it);
|
|
|
6714 |
return *this;
|
|
|
6715 |
}
|
|
|
6716 |
|
|
|
6717 |
private:
|
|
|
6718 |
/*!
|
|
|
6719 |
@brief set the iterator to the first value
|
|
|
6720 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6721 |
*/
|
|
|
6722 |
void set_begin() noexcept
|
|
|
6723 |
{
|
|
|
6724 |
assert(m_object != nullptr);
|
|
|
6725 |
|
|
|
6726 |
switch (m_object->m_type)
|
|
|
6727 |
{
|
|
|
6728 |
case basic_json::value_t::object:
|
|
|
6729 |
{
|
|
|
6730 |
m_it.object_iterator = m_object->m_value.object->begin();
|
|
|
6731 |
break;
|
|
|
6732 |
}
|
|
|
6733 |
|
|
|
6734 |
case basic_json::value_t::array:
|
|
|
6735 |
{
|
|
|
6736 |
m_it.array_iterator = m_object->m_value.array->begin();
|
|
|
6737 |
break;
|
|
|
6738 |
}
|
|
|
6739 |
|
|
|
6740 |
case basic_json::value_t::null:
|
|
|
6741 |
{
|
|
|
6742 |
// set to end so begin()==end() is true: null is empty
|
|
|
6743 |
m_it.primitive_iterator.set_end();
|
|
|
6744 |
break;
|
|
|
6745 |
}
|
|
|
6746 |
|
|
|
6747 |
default:
|
|
|
6748 |
{
|
|
|
6749 |
m_it.primitive_iterator.set_begin();
|
|
|
6750 |
break;
|
|
|
6751 |
}
|
|
|
6752 |
}
|
|
|
6753 |
}
|
|
|
6754 |
|
|
|
6755 |
/*!
|
|
|
6756 |
@brief set the iterator past the last value
|
|
|
6757 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6758 |
*/
|
|
|
6759 |
void set_end() noexcept
|
|
|
6760 |
{
|
|
|
6761 |
assert(m_object != nullptr);
|
|
|
6762 |
|
|
|
6763 |
switch (m_object->m_type)
|
|
|
6764 |
{
|
|
|
6765 |
case basic_json::value_t::object:
|
|
|
6766 |
{
|
|
|
6767 |
m_it.object_iterator = m_object->m_value.object->end();
|
|
|
6768 |
break;
|
|
|
6769 |
}
|
|
|
6770 |
|
|
|
6771 |
case basic_json::value_t::array:
|
|
|
6772 |
{
|
|
|
6773 |
m_it.array_iterator = m_object->m_value.array->end();
|
|
|
6774 |
break;
|
|
|
6775 |
}
|
|
|
6776 |
|
|
|
6777 |
default:
|
|
|
6778 |
{
|
|
|
6779 |
m_it.primitive_iterator.set_end();
|
|
|
6780 |
break;
|
|
|
6781 |
}
|
|
|
6782 |
}
|
|
|
6783 |
}
|
|
|
6784 |
|
|
|
6785 |
public:
|
|
|
6786 |
/*!
|
|
|
6787 |
@brief return a reference to the value pointed to by the iterator
|
|
|
6788 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6789 |
*/
|
|
|
6790 |
reference operator*() const
|
|
|
6791 |
{
|
|
|
6792 |
assert(m_object != nullptr);
|
|
|
6793 |
|
|
|
6794 |
switch (m_object->m_type)
|
|
|
6795 |
{
|
|
|
6796 |
case basic_json::value_t::object:
|
|
|
6797 |
{
|
|
|
6798 |
assert(m_it.object_iterator != m_object->m_value.object->end());
|
|
|
6799 |
return m_it.object_iterator->second;
|
|
|
6800 |
}
|
|
|
6801 |
|
|
|
6802 |
case basic_json::value_t::array:
|
|
|
6803 |
{
|
|
|
6804 |
assert(m_it.array_iterator != m_object->m_value.array->end());
|
|
|
6805 |
return *m_it.array_iterator;
|
|
|
6806 |
}
|
|
|
6807 |
|
|
|
6808 |
case basic_json::value_t::null:
|
|
|
6809 |
{
|
|
|
6810 |
throw std::out_of_range("cannot get value");
|
|
|
6811 |
}
|
|
|
6812 |
|
|
|
6813 |
default:
|
|
|
6814 |
{
|
|
|
6815 |
if (m_it.primitive_iterator.is_begin())
|
|
|
6816 |
{
|
|
|
6817 |
return *m_object;
|
|
|
6818 |
}
|
|
|
6819 |
else
|
|
|
6820 |
{
|
|
|
6821 |
throw std::out_of_range("cannot get value");
|
|
|
6822 |
}
|
|
|
6823 |
}
|
|
|
6824 |
}
|
|
|
6825 |
}
|
|
|
6826 |
|
|
|
6827 |
/*!
|
|
|
6828 |
@brief dereference the iterator
|
|
|
6829 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6830 |
*/
|
|
|
6831 |
pointer operator->() const
|
|
|
6832 |
{
|
|
|
6833 |
assert(m_object != nullptr);
|
|
|
6834 |
|
|
|
6835 |
switch (m_object->m_type)
|
|
|
6836 |
{
|
|
|
6837 |
case basic_json::value_t::object:
|
|
|
6838 |
{
|
|
|
6839 |
assert(m_it.object_iterator != m_object->m_value.object->end());
|
|
|
6840 |
return &(m_it.object_iterator->second);
|
|
|
6841 |
}
|
|
|
6842 |
|
|
|
6843 |
case basic_json::value_t::array:
|
|
|
6844 |
{
|
|
|
6845 |
assert(m_it.array_iterator != m_object->m_value.array->end());
|
|
|
6846 |
return &*m_it.array_iterator;
|
|
|
6847 |
}
|
|
|
6848 |
|
|
|
6849 |
default:
|
|
|
6850 |
{
|
|
|
6851 |
if (m_it.primitive_iterator.is_begin())
|
|
|
6852 |
{
|
|
|
6853 |
return m_object;
|
|
|
6854 |
}
|
|
|
6855 |
else
|
|
|
6856 |
{
|
|
|
6857 |
throw std::out_of_range("cannot get value");
|
|
|
6858 |
}
|
|
|
6859 |
}
|
|
|
6860 |
}
|
|
|
6861 |
}
|
|
|
6862 |
|
|
|
6863 |
/*!
|
|
|
6864 |
@brief post-increment (it++)
|
|
|
6865 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6866 |
*/
|
|
|
6867 |
const_iterator operator++(int)
|
|
|
6868 |
{
|
|
|
6869 |
auto result = *this;
|
|
|
6870 |
++(*this);
|
|
|
6871 |
return result;
|
|
|
6872 |
}
|
|
|
6873 |
|
|
|
6874 |
/*!
|
|
|
6875 |
@brief pre-increment (++it)
|
|
|
6876 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6877 |
*/
|
|
|
6878 |
const_iterator& operator++()
|
|
|
6879 |
{
|
|
|
6880 |
assert(m_object != nullptr);
|
|
|
6881 |
|
|
|
6882 |
switch (m_object->m_type)
|
|
|
6883 |
{
|
|
|
6884 |
case basic_json::value_t::object:
|
|
|
6885 |
{
|
|
|
6886 |
std::advance(m_it.object_iterator, 1);
|
|
|
6887 |
break;
|
|
|
6888 |
}
|
|
|
6889 |
|
|
|
6890 |
case basic_json::value_t::array:
|
|
|
6891 |
{
|
|
|
6892 |
std::advance(m_it.array_iterator, 1);
|
|
|
6893 |
break;
|
|
|
6894 |
}
|
|
|
6895 |
|
|
|
6896 |
default:
|
|
|
6897 |
{
|
|
|
6898 |
++m_it.primitive_iterator;
|
|
|
6899 |
break;
|
|
|
6900 |
}
|
|
|
6901 |
}
|
|
|
6902 |
|
|
|
6903 |
return *this;
|
|
|
6904 |
}
|
|
|
6905 |
|
|
|
6906 |
/*!
|
|
|
6907 |
@brief post-decrement (it--)
|
|
|
6908 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6909 |
*/
|
|
|
6910 |
const_iterator operator--(int)
|
|
|
6911 |
{
|
|
|
6912 |
auto result = *this;
|
|
|
6913 |
--(*this);
|
|
|
6914 |
return result;
|
|
|
6915 |
}
|
|
|
6916 |
|
|
|
6917 |
/*!
|
|
|
6918 |
@brief pre-decrement (--it)
|
|
|
6919 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6920 |
*/
|
|
|
6921 |
const_iterator& operator--()
|
|
|
6922 |
{
|
|
|
6923 |
assert(m_object != nullptr);
|
|
|
6924 |
|
|
|
6925 |
switch (m_object->m_type)
|
|
|
6926 |
{
|
|
|
6927 |
case basic_json::value_t::object:
|
|
|
6928 |
{
|
|
|
6929 |
std::advance(m_it.object_iterator, -1);
|
|
|
6930 |
break;
|
|
|
6931 |
}
|
|
|
6932 |
|
|
|
6933 |
case basic_json::value_t::array:
|
|
|
6934 |
{
|
|
|
6935 |
std::advance(m_it.array_iterator, -1);
|
|
|
6936 |
break;
|
|
|
6937 |
}
|
|
|
6938 |
|
|
|
6939 |
default:
|
|
|
6940 |
{
|
|
|
6941 |
--m_it.primitive_iterator;
|
|
|
6942 |
break;
|
|
|
6943 |
}
|
|
|
6944 |
}
|
|
|
6945 |
|
|
|
6946 |
return *this;
|
|
|
6947 |
}
|
|
|
6948 |
|
|
|
6949 |
/*!
|
|
|
6950 |
@brief comparison: equal
|
|
|
6951 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6952 |
*/
|
|
|
6953 |
bool operator==(const const_iterator& other) const
|
|
|
6954 |
{
|
|
|
6955 |
// if objects are not the same, the comparison is undefined
|
|
|
6956 |
if (m_object != other.m_object)
|
|
|
6957 |
{
|
|
|
6958 |
throw std::domain_error("cannot compare iterators of different containers");
|
|
|
6959 |
}
|
|
|
6960 |
|
|
|
6961 |
assert(m_object != nullptr);
|
|
|
6962 |
|
|
|
6963 |
switch (m_object->m_type)
|
|
|
6964 |
{
|
|
|
6965 |
case basic_json::value_t::object:
|
|
|
6966 |
{
|
|
|
6967 |
return (m_it.object_iterator == other.m_it.object_iterator);
|
|
|
6968 |
}
|
|
|
6969 |
|
|
|
6970 |
case basic_json::value_t::array:
|
|
|
6971 |
{
|
|
|
6972 |
return (m_it.array_iterator == other.m_it.array_iterator);
|
|
|
6973 |
}
|
|
|
6974 |
|
|
|
6975 |
default:
|
|
|
6976 |
{
|
|
|
6977 |
return (m_it.primitive_iterator == other.m_it.primitive_iterator);
|
|
|
6978 |
}
|
|
|
6979 |
}
|
|
|
6980 |
}
|
|
|
6981 |
|
|
|
6982 |
/*!
|
|
|
6983 |
@brief comparison: not equal
|
|
|
6984 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6985 |
*/
|
|
|
6986 |
bool operator!=(const const_iterator& other) const
|
|
|
6987 |
{
|
|
|
6988 |
return not operator==(other);
|
|
|
6989 |
}
|
|
|
6990 |
|
|
|
6991 |
/*!
|
|
|
6992 |
@brief comparison: smaller
|
|
|
6993 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
6994 |
*/
|
|
|
6995 |
bool operator<(const const_iterator& other) const
|
|
|
6996 |
{
|
|
|
6997 |
// if objects are not the same, the comparison is undefined
|
|
|
6998 |
if (m_object != other.m_object)
|
|
|
6999 |
{
|
|
|
7000 |
throw std::domain_error("cannot compare iterators of different containers");
|
|
|
7001 |
}
|
|
|
7002 |
|
|
|
7003 |
assert(m_object != nullptr);
|
|
|
7004 |
|
|
|
7005 |
switch (m_object->m_type)
|
|
|
7006 |
{
|
|
|
7007 |
case basic_json::value_t::object:
|
|
|
7008 |
{
|
|
|
7009 |
throw std::domain_error("cannot compare order of object iterators");
|
|
|
7010 |
}
|
|
|
7011 |
|
|
|
7012 |
case basic_json::value_t::array:
|
|
|
7013 |
{
|
|
|
7014 |
return (m_it.array_iterator < other.m_it.array_iterator);
|
|
|
7015 |
}
|
|
|
7016 |
|
|
|
7017 |
default:
|
|
|
7018 |
{
|
|
|
7019 |
return (m_it.primitive_iterator < other.m_it.primitive_iterator);
|
|
|
7020 |
}
|
|
|
7021 |
}
|
|
|
7022 |
}
|
|
|
7023 |
|
|
|
7024 |
/*!
|
|
|
7025 |
@brief comparison: less than or equal
|
|
|
7026 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7027 |
*/
|
|
|
7028 |
bool operator<=(const const_iterator& other) const
|
|
|
7029 |
{
|
|
|
7030 |
return not other.operator < (*this);
|
|
|
7031 |
}
|
|
|
7032 |
|
|
|
7033 |
/*!
|
|
|
7034 |
@brief comparison: greater than
|
|
|
7035 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7036 |
*/
|
|
|
7037 |
bool operator>(const const_iterator& other) const
|
|
|
7038 |
{
|
|
|
7039 |
return not operator<=(other);
|
|
|
7040 |
}
|
|
|
7041 |
|
|
|
7042 |
/*!
|
|
|
7043 |
@brief comparison: greater than or equal
|
|
|
7044 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7045 |
*/
|
|
|
7046 |
bool operator>=(const const_iterator& other) const
|
|
|
7047 |
{
|
|
|
7048 |
return not operator<(other);
|
|
|
7049 |
}
|
|
|
7050 |
|
|
|
7051 |
/*!
|
|
|
7052 |
@brief add to iterator
|
|
|
7053 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7054 |
*/
|
|
|
7055 |
const_iterator& operator+=(difference_type i)
|
|
|
7056 |
{
|
|
|
7057 |
assert(m_object != nullptr);
|
|
|
7058 |
|
|
|
7059 |
switch (m_object->m_type)
|
|
|
7060 |
{
|
|
|
7061 |
case basic_json::value_t::object:
|
|
|
7062 |
{
|
|
|
7063 |
throw std::domain_error("cannot use offsets with object iterators");
|
|
|
7064 |
}
|
|
|
7065 |
|
|
|
7066 |
case basic_json::value_t::array:
|
|
|
7067 |
{
|
|
|
7068 |
std::advance(m_it.array_iterator, i);
|
|
|
7069 |
break;
|
|
|
7070 |
}
|
|
|
7071 |
|
|
|
7072 |
default:
|
|
|
7073 |
{
|
|
|
7074 |
m_it.primitive_iterator += i;
|
|
|
7075 |
break;
|
|
|
7076 |
}
|
|
|
7077 |
}
|
|
|
7078 |
|
|
|
7079 |
return *this;
|
|
|
7080 |
}
|
|
|
7081 |
|
|
|
7082 |
/*!
|
|
|
7083 |
@brief subtract from iterator
|
|
|
7084 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7085 |
*/
|
|
|
7086 |
const_iterator& operator-=(difference_type i)
|
|
|
7087 |
{
|
|
|
7088 |
return operator+=(-i);
|
|
|
7089 |
}
|
|
|
7090 |
|
|
|
7091 |
/*!
|
|
|
7092 |
@brief add to iterator
|
|
|
7093 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7094 |
*/
|
|
|
7095 |
const_iterator operator+(difference_type i)
|
|
|
7096 |
{
|
|
|
7097 |
auto result = *this;
|
|
|
7098 |
result += i;
|
|
|
7099 |
return result;
|
|
|
7100 |
}
|
|
|
7101 |
|
|
|
7102 |
/*!
|
|
|
7103 |
@brief subtract from iterator
|
|
|
7104 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7105 |
*/
|
|
|
7106 |
const_iterator operator-(difference_type i)
|
|
|
7107 |
{
|
|
|
7108 |
auto result = *this;
|
|
|
7109 |
result -= i;
|
|
|
7110 |
return result;
|
|
|
7111 |
}
|
|
|
7112 |
|
|
|
7113 |
/*!
|
|
|
7114 |
@brief return difference
|
|
|
7115 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7116 |
*/
|
|
|
7117 |
difference_type operator-(const const_iterator& other) const
|
|
|
7118 |
{
|
|
|
7119 |
assert(m_object != nullptr);
|
|
|
7120 |
|
|
|
7121 |
switch (m_object->m_type)
|
|
|
7122 |
{
|
|
|
7123 |
case basic_json::value_t::object:
|
|
|
7124 |
{
|
|
|
7125 |
throw std::domain_error("cannot use offsets with object iterators");
|
|
|
7126 |
}
|
|
|
7127 |
|
|
|
7128 |
case basic_json::value_t::array:
|
|
|
7129 |
{
|
|
|
7130 |
return m_it.array_iterator - other.m_it.array_iterator;
|
|
|
7131 |
}
|
|
|
7132 |
|
|
|
7133 |
default:
|
|
|
7134 |
{
|
|
|
7135 |
return m_it.primitive_iterator - other.m_it.primitive_iterator;
|
|
|
7136 |
}
|
|
|
7137 |
}
|
|
|
7138 |
}
|
|
|
7139 |
|
|
|
7140 |
/*!
|
|
|
7141 |
@brief access to successor
|
|
|
7142 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7143 |
*/
|
|
|
7144 |
reference operator[](difference_type n) const
|
|
|
7145 |
{
|
|
|
7146 |
assert(m_object != nullptr);
|
|
|
7147 |
|
|
|
7148 |
switch (m_object->m_type)
|
|
|
7149 |
{
|
|
|
7150 |
case basic_json::value_t::object:
|
|
|
7151 |
{
|
|
|
7152 |
throw std::domain_error("cannot use operator[] for object iterators");
|
|
|
7153 |
}
|
|
|
7154 |
|
|
|
7155 |
case basic_json::value_t::array:
|
|
|
7156 |
{
|
|
|
7157 |
return *std::next(m_it.array_iterator, n);
|
|
|
7158 |
}
|
|
|
7159 |
|
|
|
7160 |
case basic_json::value_t::null:
|
|
|
7161 |
{
|
|
|
7162 |
throw std::out_of_range("cannot get value");
|
|
|
7163 |
}
|
|
|
7164 |
|
|
|
7165 |
default:
|
|
|
7166 |
{
|
|
|
7167 |
if (m_it.primitive_iterator == -n)
|
|
|
7168 |
{
|
|
|
7169 |
return *m_object;
|
|
|
7170 |
}
|
|
|
7171 |
else
|
|
|
7172 |
{
|
|
|
7173 |
throw std::out_of_range("cannot get value");
|
|
|
7174 |
}
|
|
|
7175 |
}
|
|
|
7176 |
}
|
|
|
7177 |
}
|
|
|
7178 |
|
|
|
7179 |
/*!
|
|
|
7180 |
@brief return the key of an object iterator
|
|
|
7181 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7182 |
*/
|
|
|
7183 |
typename object_t::key_type key() const
|
|
|
7184 |
{
|
|
|
7185 |
assert(m_object != nullptr);
|
|
|
7186 |
|
|
|
7187 |
if (m_object->is_object())
|
|
|
7188 |
{
|
|
|
7189 |
return m_it.object_iterator->first;
|
|
|
7190 |
}
|
|
|
7191 |
else
|
|
|
7192 |
{
|
|
|
7193 |
throw std::domain_error("cannot use key() for non-object iterators");
|
|
|
7194 |
}
|
|
|
7195 |
}
|
|
|
7196 |
|
|
|
7197 |
/*!
|
|
|
7198 |
@brief return the value of an iterator
|
|
|
7199 |
@pre The iterator is initialized; i.e. `m_object != nullptr`.
|
|
|
7200 |
*/
|
|
|
7201 |
reference value() const
|
|
|
7202 |
{
|
|
|
7203 |
return operator*();
|
|
|
7204 |
}
|
|
|
7205 |
|
|
|
7206 |
private:
|
|
|
7207 |
/// associated JSON instance
|
|
|
7208 |
pointer m_object = nullptr;
|
|
|
7209 |
/// the actual iterator of the associated instance
|
|
|
7210 |
internal_iterator m_it = internal_iterator();
|
|
|
7211 |
};
|
|
|
7212 |
|
|
|
7213 |
/*!
|
|
|
7214 |
@brief a mutable random access iterator for the @ref basic_json class
|
|
|
7215 |
|
|
|
7216 |
@requirement The class satisfies the following concept requirements:
|
|
|
7217 |
- [RandomAccessIterator](http://en.cppreference.com/w/cpp/concept/RandomAccessIterator):
|
|
|
7218 |
The iterator that can be moved to point (forward and backward) to any
|
|
|
7219 |
element in constant time.
|
|
|
7220 |
- [OutputIterator](http://en.cppreference.com/w/cpp/concept/OutputIterator):
|
|
|
7221 |
It is possible to write to the pointed-to element.
|
|
|
7222 |
|
|
|
7223 |
@since version 1.0.0
|
|
|
7224 |
*/
|
|
|
7225 |
class iterator : public const_iterator
|
|
|
7226 |
{
|
|
|
7227 |
public:
|
|
|
7228 |
using base_iterator = const_iterator;
|
|
|
7229 |
using pointer = typename basic_json::pointer;
|
|
|
7230 |
using reference = typename basic_json::reference;
|
|
|
7231 |
|
|
|
7232 |
/// default constructor
|
|
|
7233 |
iterator() = default;
|
|
|
7234 |
|
|
|
7235 |
/// constructor for a given JSON instance
|
|
|
7236 |
explicit iterator(pointer object) noexcept
|
|
|
7237 |
: base_iterator(object)
|
|
|
7238 |
{}
|
|
|
7239 |
|
|
|
7240 |
/// copy constructor
|
|
|
7241 |
iterator(const iterator& other) noexcept
|
|
|
7242 |
: base_iterator(other)
|
|
|
7243 |
{}
|
|
|
7244 |
|
|
|
7245 |
/// copy assignment
|
|
|
7246 |
iterator& operator=(iterator other) noexcept(
|
|
|
7247 |
std::is_nothrow_move_constructible<pointer>::value and
|
|
|
7248 |
std::is_nothrow_move_assignable<pointer>::value and
|
|
|
7249 |
std::is_nothrow_move_constructible<internal_iterator>::value and
|
|
|
7250 |
std::is_nothrow_move_assignable<internal_iterator>::value
|
|
|
7251 |
)
|
|
|
7252 |
{
|
|
|
7253 |
base_iterator::operator=(other);
|
|
|
7254 |
return *this;
|
|
|
7255 |
}
|
|
|
7256 |
|
|
|
7257 |
/// return a reference to the value pointed to by the iterator
|
|
|
7258 |
reference operator*() const
|
|
|
7259 |
{
|
|
|
7260 |
return const_cast<reference>(base_iterator::operator*());
|
|
|
7261 |
}
|
|
|
7262 |
|
|
|
7263 |
/// dereference the iterator
|
|
|
7264 |
pointer operator->() const
|
|
|
7265 |
{
|
|
|
7266 |
return const_cast<pointer>(base_iterator::operator->());
|
|
|
7267 |
}
|
|
|
7268 |
|
|
|
7269 |
/// post-increment (it++)
|
|
|
7270 |
iterator operator++(int)
|
|
|
7271 |
{
|
|
|
7272 |
iterator result = *this;
|
|
|
7273 |
base_iterator::operator++();
|
|
|
7274 |
return result;
|
|
|
7275 |
}
|
|
|
7276 |
|
|
|
7277 |
/// pre-increment (++it)
|
|
|
7278 |
iterator& operator++()
|
|
|
7279 |
{
|
|
|
7280 |
base_iterator::operator++();
|
|
|
7281 |
return *this;
|
|
|
7282 |
}
|
|
|
7283 |
|
|
|
7284 |
/// post-decrement (it--)
|
|
|
7285 |
iterator operator--(int)
|
|
|
7286 |
{
|
|
|
7287 |
iterator result = *this;
|
|
|
7288 |
base_iterator::operator--();
|
|
|
7289 |
return result;
|
|
|
7290 |
}
|
|
|
7291 |
|
|
|
7292 |
/// pre-decrement (--it)
|
|
|
7293 |
iterator& operator--()
|
|
|
7294 |
{
|
|
|
7295 |
base_iterator::operator--();
|
|
|
7296 |
return *this;
|
|
|
7297 |
}
|
|
|
7298 |
|
|
|
7299 |
/// add to iterator
|
|
|
7300 |
iterator& operator+=(difference_type i)
|
|
|
7301 |
{
|
|
|
7302 |
base_iterator::operator+=(i);
|
|
|
7303 |
return *this;
|
|
|
7304 |
}
|
|
|
7305 |
|
|
|
7306 |
/// subtract from iterator
|
|
|
7307 |
iterator& operator-=(difference_type i)
|
|
|
7308 |
{
|
|
|
7309 |
base_iterator::operator-=(i);
|
|
|
7310 |
return *this;
|
|
|
7311 |
}
|
|
|
7312 |
|
|
|
7313 |
/// add to iterator
|
|
|
7314 |
iterator operator+(difference_type i)
|
|
|
7315 |
{
|
|
|
7316 |
auto result = *this;
|
|
|
7317 |
result += i;
|
|
|
7318 |
return result;
|
|
|
7319 |
}
|
|
|
7320 |
|
|
|
7321 |
/// subtract from iterator
|
|
|
7322 |
iterator operator-(difference_type i)
|
|
|
7323 |
{
|
|
|
7324 |
auto result = *this;
|
|
|
7325 |
result -= i;
|
|
|
7326 |
return result;
|
|
|
7327 |
}
|
|
|
7328 |
|
|
|
7329 |
/// return difference
|
|
|
7330 |
difference_type operator-(const iterator& other) const
|
|
|
7331 |
{
|
|
|
7332 |
return base_iterator::operator-(other);
|
|
|
7333 |
}
|
|
|
7334 |
|
|
|
7335 |
/// access to successor
|
|
|
7336 |
reference operator[](difference_type n) const
|
|
|
7337 |
{
|
|
|
7338 |
return const_cast<reference>(base_iterator::operator[](n));
|
|
|
7339 |
}
|
|
|
7340 |
|
|
|
7341 |
/// return the value of an iterator
|
|
|
7342 |
reference value() const
|
|
|
7343 |
{
|
|
|
7344 |
return const_cast<reference>(base_iterator::value());
|
|
|
7345 |
}
|
|
|
7346 |
};
|
|
|
7347 |
|
|
|
7348 |
/*!
|
|
|
7349 |
@brief a template for a reverse iterator class
|
|
|
7350 |
|
|
|
7351 |
@tparam Base the base iterator type to reverse. Valid types are @ref
|
|
|
7352 |
iterator (to create @ref reverse_iterator) and @ref const_iterator (to
|
|
|
7353 |
create @ref const_reverse_iterator).
|
|
|
7354 |
|
|
|
7355 |
@requirement The class satisfies the following concept requirements:
|
|
|
7356 |
- [RandomAccessIterator](http://en.cppreference.com/w/cpp/concept/RandomAccessIterator):
|
|
|
7357 |
The iterator that can be moved to point (forward and backward) to any
|
|
|
7358 |
element in constant time.
|
|
|
7359 |
- [OutputIterator](http://en.cppreference.com/w/cpp/concept/OutputIterator):
|
|
|
7360 |
It is possible to write to the pointed-to element (only if @a Base is
|
|
|
7361 |
@ref iterator).
|
|
|
7362 |
|
|
|
7363 |
@since version 1.0.0
|
|
|
7364 |
*/
|
|
|
7365 |
template<typename Base>
|
|
|
7366 |
class json_reverse_iterator : public std::reverse_iterator<Base>
|
|
|
7367 |
{
|
|
|
7368 |
public:
|
|
|
7369 |
/// shortcut to the reverse iterator adaptor
|
|
|
7370 |
using base_iterator = std::reverse_iterator<Base>;
|
|
|
7371 |
/// the reference type for the pointed-to element
|
|
|
7372 |
using reference = typename Base::reference;
|
|
|
7373 |
|
|
|
7374 |
/// create reverse iterator from iterator
|
|
|
7375 |
json_reverse_iterator(const typename base_iterator::iterator_type& it) noexcept
|
|
|
7376 |
: base_iterator(it)
|
|
|
7377 |
{}
|
|
|
7378 |
|
|
|
7379 |
/// create reverse iterator from base class
|
|
|
7380 |
json_reverse_iterator(const base_iterator& it) noexcept
|
|
|
7381 |
: base_iterator(it)
|
|
|
7382 |
{}
|
|
|
7383 |
|
|
|
7384 |
/// post-increment (it++)
|
|
|
7385 |
json_reverse_iterator operator++(int)
|
|
|
7386 |
{
|
|
|
7387 |
return base_iterator::operator++(1);
|
|
|
7388 |
}
|
|
|
7389 |
|
|
|
7390 |
/// pre-increment (++it)
|
|
|
7391 |
json_reverse_iterator& operator++()
|
|
|
7392 |
{
|
|
|
7393 |
base_iterator::operator++();
|
|
|
7394 |
return *this;
|
|
|
7395 |
}
|
|
|
7396 |
|
|
|
7397 |
/// post-decrement (it--)
|
|
|
7398 |
json_reverse_iterator operator--(int)
|
|
|
7399 |
{
|
|
|
7400 |
return base_iterator::operator--(1);
|
|
|
7401 |
}
|
|
|
7402 |
|
|
|
7403 |
/// pre-decrement (--it)
|
|
|
7404 |
json_reverse_iterator& operator--()
|
|
|
7405 |
{
|
|
|
7406 |
base_iterator::operator--();
|
|
|
7407 |
return *this;
|
|
|
7408 |
}
|
|
|
7409 |
|
|
|
7410 |
/// add to iterator
|
|
|
7411 |
json_reverse_iterator& operator+=(difference_type i)
|
|
|
7412 |
{
|
|
|
7413 |
base_iterator::operator+=(i);
|
|
|
7414 |
return *this;
|
|
|
7415 |
}
|
|
|
7416 |
|
|
|
7417 |
/// add to iterator
|
|
|
7418 |
json_reverse_iterator operator+(difference_type i) const
|
|
|
7419 |
{
|
|
|
7420 |
auto result = *this;
|
|
|
7421 |
result += i;
|
|
|
7422 |
return result;
|
|
|
7423 |
}
|
|
|
7424 |
|
|
|
7425 |
/// subtract from iterator
|
|
|
7426 |
json_reverse_iterator operator-(difference_type i) const
|
|
|
7427 |
{
|
|
|
7428 |
auto result = *this;
|
|
|
7429 |
result -= i;
|
|
|
7430 |
return result;
|
|
|
7431 |
}
|
|
|
7432 |
|
|
|
7433 |
/// return difference
|
|
|
7434 |
difference_type operator-(const json_reverse_iterator& other) const
|
|
|
7435 |
{
|
|
|
7436 |
return this->base() - other.base();
|
|
|
7437 |
}
|
|
|
7438 |
|
|
|
7439 |
/// access to successor
|
|
|
7440 |
reference operator[](difference_type n) const
|
|
|
7441 |
{
|
|
|
7442 |
return *(this->operator+(n));
|
|
|
7443 |
}
|
|
|
7444 |
|
|
|
7445 |
/// return the key of an object iterator
|
|
|
7446 |
typename object_t::key_type key() const
|
|
|
7447 |
{
|
|
|
7448 |
auto it = --this->base();
|
|
|
7449 |
return it.key();
|
|
|
7450 |
}
|
|
|
7451 |
|
|
|
7452 |
/// return the value of an iterator
|
|
|
7453 |
reference value() const
|
|
|
7454 |
{
|
|
|
7455 |
auto it = --this->base();
|
|
|
7456 |
return it.operator * ();
|
|
|
7457 |
}
|
|
|
7458 |
};
|
|
|
7459 |
|
|
|
7460 |
|
|
|
7461 |
private:
|
|
|
7462 |
//////////////////////
|
|
|
7463 |
// lexer and parser //
|
|
|
7464 |
//////////////////////
|
|
|
7465 |
|
|
|
7466 |
/*!
|
|
|
7467 |
@brief lexical analysis
|
|
|
7468 |
|
|
|
7469 |
This class organizes the lexical analysis during JSON deserialization. The
|
|
|
7470 |
core of it is a scanner generated by [re2c](http://re2c.org) that
|
|
|
7471 |
processes a buffer and recognizes tokens according to RFC 7159.
|
|
|
7472 |
*/
|
|
|
7473 |
class lexer
|
|
|
7474 |
{
|
|
|
7475 |
public:
|
|
|
7476 |
/// token types for the parser
|
|
|
7477 |
enum class token_type
|
|
|
7478 |
{
|
|
|
7479 |
uninitialized, ///< indicating the scanner is uninitialized
|
|
|
7480 |
literal_true, ///< the `true` literal
|
|
|
7481 |
literal_false, ///< the `false` literal
|
|
|
7482 |
literal_null, ///< the `null` literal
|
|
|
7483 |
value_string, ///< a string -- use get_string() for actual value
|
|
|
7484 |
value_number, ///< a number -- use get_number() for actual value
|
|
|
7485 |
begin_array, ///< the character for array begin `[`
|
|
|
7486 |
begin_object, ///< the character for object begin `{`
|
|
|
7487 |
end_array, ///< the character for array end `]`
|
|
|
7488 |
end_object, ///< the character for object end `}`
|
|
|
7489 |
name_separator, ///< the name separator `:`
|
|
|
7490 |
value_separator, ///< the value separator `,`
|
|
|
7491 |
parse_error, ///< indicating a parse error
|
|
|
7492 |
end_of_input ///< indicating the end of the input buffer
|
|
|
7493 |
};
|
|
|
7494 |
|
|
|
7495 |
/// the char type to use in the lexer
|
|
|
7496 |
using lexer_char_t = unsigned char;
|
|
|
7497 |
|
|
|
7498 |
/// constructor with a given buffer
|
|
|
7499 |
explicit lexer(const string_t& s) noexcept
|
|
|
7500 |
: m_stream(nullptr), m_buffer(s)
|
|
|
7501 |
{
|
|
|
7502 |
m_content = reinterpret_cast<const lexer_char_t*>(m_buffer.c_str());
|
|
|
7503 |
assert(m_content != nullptr);
|
|
|
7504 |
m_start = m_cursor = m_content;
|
|
|
7505 |
m_limit = m_content + s.size();
|
|
|
7506 |
}
|
|
|
7507 |
|
|
|
7508 |
/// constructor with a given stream
|
|
|
7509 |
explicit lexer(std::istream* s) noexcept
|
|
|
7510 |
: m_stream(s), m_buffer()
|
|
|
7511 |
{
|
|
|
7512 |
assert(m_stream != nullptr);
|
|
|
7513 |
std::getline(*m_stream, m_buffer);
|
|
|
7514 |
m_content = reinterpret_cast<const lexer_char_t*>(m_buffer.c_str());
|
|
|
7515 |
assert(m_content != nullptr);
|
|
|
7516 |
m_start = m_cursor = m_content;
|
|
|
7517 |
m_limit = m_content + m_buffer.size();
|
|
|
7518 |
}
|
|
|
7519 |
|
|
|
7520 |
/// default constructor
|
|
|
7521 |
lexer() = default;
|
|
|
7522 |
|
|
|
7523 |
// switch off unwanted functions
|
|
|
7524 |
lexer(const lexer&) = delete;
|
|
|
7525 |
lexer operator=(const lexer&) = delete;
|
|
|
7526 |
|
|
|
7527 |
/*!
|
|
|
7528 |
@brief create a string from one or two Unicode code points
|
|
|
7529 |
|
|
|
7530 |
There are two cases: (1) @a codepoint1 is in the Basic Multilingual
|
|
|
7531 |
Plane (U+0000 through U+FFFF) and @a codepoint2 is 0, or (2)
|
|
|
7532 |
@a codepoint1 and @a codepoint2 are a UTF-16 surrogate pair to
|
|
|
7533 |
represent a code point above U+FFFF.
|
|
|
7534 |
|
|
|
7535 |
@param[in] codepoint1 the code point (can be high surrogate)
|
|
|
7536 |
@param[in] codepoint2 the code point (can be low surrogate or 0)
|
|
|
7537 |
|
|
|
7538 |
@return string representation of the code point; the length of the
|
|
|
7539 |
result string is between 1 and 4 characters.
|
|
|
7540 |
|
|
|
7541 |
@throw std::out_of_range if code point is > 0x10ffff; example: `"code
|
|
|
7542 |
points above 0x10FFFF are invalid"`
|
|
|
7543 |
@throw std::invalid_argument if the low surrogate is invalid; example:
|
|
|
7544 |
`""missing or wrong low surrogate""`
|
|
|
7545 |
|
|
|
7546 |
@complexity Constant.
|
|
|
7547 |
|
|
|
7548 |
@see <http://en.wikipedia.org/wiki/UTF-8#Sample_code>
|
|
|
7549 |
*/
|
|
|
7550 |
static string_t to_unicode(const std::size_t codepoint1,
|
|
|
7551 |
const std::size_t codepoint2 = 0)
|
|
|
7552 |
{
|
|
|
7553 |
// calculate the code point from the given code points
|
|
|
7554 |
std::size_t codepoint = codepoint1;
|
|
|
7555 |
|
|
|
7556 |
// check if codepoint1 is a high surrogate
|
|
|
7557 |
if (codepoint1 >= 0xD800 and codepoint1 <= 0xDBFF)
|
|
|
7558 |
{
|
|
|
7559 |
// check if codepoint2 is a low surrogate
|
|
|
7560 |
if (codepoint2 >= 0xDC00 and codepoint2 <= 0xDFFF)
|
|
|
7561 |
{
|
|
|
7562 |
codepoint =
|
|
|
7563 |
// high surrogate occupies the most significant 22 bits
|
|
|
7564 |
(codepoint1 << 10)
|
|
|
7565 |
// low surrogate occupies the least significant 15 bits
|
|
|
7566 |
+ codepoint2
|
|
|
7567 |
// there is still the 0xD800, 0xDC00 and 0x10000 noise
|
|
|
7568 |
// in the result so we have to subtract with:
|
|
|
7569 |
// (0xD800 << 10) + DC00 - 0x10000 = 0x35FDC00
|
|
|
7570 |
- 0x35FDC00;
|
|
|
7571 |
}
|
|
|
7572 |
else
|
|
|
7573 |
{
|
|
|
7574 |
throw std::invalid_argument("missing or wrong low surrogate");
|
|
|
7575 |
}
|
|
|
7576 |
}
|
|
|
7577 |
|
|
|
7578 |
string_t result;
|
|
|
7579 |
|
|
|
7580 |
if (codepoint < 0x80)
|
|
|
7581 |
{
|
|
|
7582 |
// 1-byte characters: 0xxxxxxx (ASCII)
|
|
|
7583 |
result.append(1, static_cast<typename string_t::value_type>(codepoint));
|
|
|
7584 |
}
|
|
|
7585 |
else if (codepoint <= 0x7ff)
|
|
|
7586 |
{
|
|
|
7587 |
// 2-byte characters: 110xxxxx 10xxxxxx
|
|
|
7588 |
result.append(1, static_cast<typename string_t::value_type>(0xC0 | ((codepoint >> 6) & 0x1F)));
|
|
|
7589 |
result.append(1, static_cast<typename string_t::value_type>(0x80 | (codepoint & 0x3F)));
|
|
|
7590 |
}
|
|
|
7591 |
else if (codepoint <= 0xffff)
|
|
|
7592 |
{
|
|
|
7593 |
// 3-byte characters: 1110xxxx 10xxxxxx 10xxxxxx
|
|
|
7594 |
result.append(1, static_cast<typename string_t::value_type>(0xE0 | ((codepoint >> 12) & 0x0F)));
|
|
|
7595 |
result.append(1, static_cast<typename string_t::value_type>(0x80 | ((codepoint >> 6) & 0x3F)));
|
|
|
7596 |
result.append(1, static_cast<typename string_t::value_type>(0x80 | (codepoint & 0x3F)));
|
|
|
7597 |
}
|
|
|
7598 |
else if (codepoint <= 0x10ffff)
|
|
|
7599 |
{
|
|
|
7600 |
// 4-byte characters: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
|
|
|
7601 |
result.append(1, static_cast<typename string_t::value_type>(0xF0 | ((codepoint >> 18) & 0x07)));
|
|
|
7602 |
result.append(1, static_cast<typename string_t::value_type>(0x80 | ((codepoint >> 12) & 0x3F)));
|
|
|
7603 |
result.append(1, static_cast<typename string_t::value_type>(0x80 | ((codepoint >> 6) & 0x3F)));
|
|
|
7604 |
result.append(1, static_cast<typename string_t::value_type>(0x80 | (codepoint & 0x3F)));
|
|
|
7605 |
}
|
|
|
7606 |
else
|
|
|
7607 |
{
|
|
|
7608 |
throw std::out_of_range("code points above 0x10FFFF are invalid");
|
|
|
7609 |
}
|
|
|
7610 |
|
|
|
7611 |
return result;
|
|
|
7612 |
}
|
|
|
7613 |
|
|
|
7614 |
/// return name of values of type token_type (only used for errors)
|
|
|
7615 |
static std::string token_type_name(const token_type t)
|
|
|
7616 |
{
|
|
|
7617 |
switch (t)
|
|
|
7618 |
{
|
|
|
7619 |
case token_type::uninitialized:
|
|
|
7620 |
return "<uninitialized>";
|
|
|
7621 |
case token_type::literal_true:
|
|
|
7622 |
return "true literal";
|
|
|
7623 |
case token_type::literal_false:
|
|
|
7624 |
return "false literal";
|
|
|
7625 |
case token_type::literal_null:
|
|
|
7626 |
return "null literal";
|
|
|
7627 |
case token_type::value_string:
|
|
|
7628 |
return "string literal";
|
|
|
7629 |
case token_type::value_number:
|
|
|
7630 |
return "number literal";
|
|
|
7631 |
case token_type::begin_array:
|
|
|
7632 |
return "'['";
|
|
|
7633 |
case token_type::begin_object:
|
|
|
7634 |
return "'{'";
|
|
|
7635 |
case token_type::end_array:
|
|
|
7636 |
return "']'";
|
|
|
7637 |
case token_type::end_object:
|
|
|
7638 |
return "'}'";
|
|
|
7639 |
case token_type::name_separator:
|
|
|
7640 |
return "':'";
|
|
|
7641 |
case token_type::value_separator:
|
|
|
7642 |
return "','";
|
|
|
7643 |
case token_type::parse_error:
|
|
|
7644 |
return "<parse error>";
|
|
|
7645 |
case token_type::end_of_input:
|
|
|
7646 |
return "end of input";
|
|
|
7647 |
default:
|
|
|
7648 |
{
|
|
|
7649 |
// catch non-enum values
|
|
|
7650 |
return "unknown token"; // LCOV_EXCL_LINE
|
|
|
7651 |
}
|
|
|
7652 |
}
|
|
|
7653 |
}
|
|
|
7654 |
|
|
|
7655 |
/*!
|
|
|
7656 |
This function implements a scanner for JSON. It is specified using
|
|
|
7657 |
regular expressions that try to follow RFC 7159 as close as possible.
|
|
|
7658 |
These regular expressions are then translated into a minimized
|
|
|
7659 |
deterministic finite automaton (DFA) by the tool
|
|
|
7660 |
[re2c](http://re2c.org). As a result, the translated code for this
|
|
|
7661 |
function consists of a large block of code with `goto` jumps.
|
|
|
7662 |
|
|
|
7663 |
@return the class of the next token read from the buffer
|
|
|
7664 |
|
|
|
7665 |
@complexity Linear in the length of the input.\n
|
|
|
7666 |
|
|
|
7667 |
Proposition: The loop below will always terminate for finite input.\n
|
|
|
7668 |
|
|
|
7669 |
Proof (by contradiction): Assume a finite input. To loop forever, the
|
|
|
7670 |
loop must never hit code with a `break` statement. The only code
|
|
|
7671 |
snippets without a `break` statement are the continue statements for
|
|
|
7672 |
whitespace and byte-order-marks. To loop forever, the input must be an
|
|
|
7673 |
infinite sequence of whitespace or byte-order-marks. This contradicts
|
|
|
7674 |
the assumption of finite input, q.e.d.
|
|
|
7675 |
*/
|
|
|
7676 |
token_type scan() noexcept
|
|
|
7677 |
{
|
|
|
7678 |
while (true)
|
|
|
7679 |
{
|
|
|
7680 |
// pointer for backtracking information
|
|
|
7681 |
m_marker = nullptr;
|
|
|
7682 |
|
|
|
7683 |
// remember the begin of the token
|
|
|
7684 |
m_start = m_cursor;
|
|
|
7685 |
assert(m_start != nullptr);
|
|
|
7686 |
|
|
|
7687 |
|
|
|
7688 |
{
|
|
|
7689 |
lexer_char_t yych;
|
|
|
7690 |
unsigned int yyaccept = 0;
|
|
|
7691 |
static const unsigned char yybm[] =
|
|
|
7692 |
{
|
|
|
7693 |
0, 0, 0, 0, 0, 0, 0, 0,
|
|
|
7694 |
0, 32, 32, 0, 0, 32, 0, 0,
|
|
|
7695 |
0, 0, 0, 0, 0, 0, 0, 0,
|
|
|
7696 |
0, 0, 0, 0, 0, 0, 0, 0,
|
|
|
7697 |
160, 128, 0, 128, 128, 128, 128, 128,
|
|
|
7698 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7699 |
192, 192, 192, 192, 192, 192, 192, 192,
|
|
|
7700 |
192, 192, 128, 128, 128, 128, 128, 128,
|
|
|
7701 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7702 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7703 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7704 |
128, 128, 128, 128, 0, 128, 128, 128,
|
|
|
7705 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7706 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7707 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7708 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7709 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7710 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7711 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7712 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7713 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7714 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7715 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7716 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7717 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7718 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7719 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7720 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7721 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7722 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7723 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7724 |
128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
7725 |
};
|
|
|
7726 |
if ((m_limit - m_cursor) < 5)
|
|
|
7727 |
{
|
|
|
7728 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
7729 |
}
|
|
|
7730 |
yych = *m_cursor;
|
|
|
7731 |
if (yybm[0 + yych] & 32)
|
|
|
7732 |
{
|
|
|
7733 |
goto basic_json_parser_6;
|
|
|
7734 |
}
|
|
|
7735 |
if (yych <= '\\')
|
|
|
7736 |
{
|
|
|
7737 |
if (yych <= '-')
|
|
|
7738 |
{
|
|
|
7739 |
if (yych <= '"')
|
|
|
7740 |
{
|
|
|
7741 |
if (yych <= 0x00)
|
|
|
7742 |
{
|
|
|
7743 |
goto basic_json_parser_2;
|
|
|
7744 |
}
|
|
|
7745 |
if (yych <= '!')
|
|
|
7746 |
{
|
|
|
7747 |
goto basic_json_parser_4;
|
|
|
7748 |
}
|
|
|
7749 |
goto basic_json_parser_9;
|
|
|
7750 |
}
|
|
|
7751 |
else
|
|
|
7752 |
{
|
|
|
7753 |
if (yych <= '+')
|
|
|
7754 |
{
|
|
|
7755 |
goto basic_json_parser_4;
|
|
|
7756 |
}
|
|
|
7757 |
if (yych <= ',')
|
|
|
7758 |
{
|
|
|
7759 |
goto basic_json_parser_10;
|
|
|
7760 |
}
|
|
|
7761 |
goto basic_json_parser_12;
|
|
|
7762 |
}
|
|
|
7763 |
}
|
|
|
7764 |
else
|
|
|
7765 |
{
|
|
|
7766 |
if (yych <= '9')
|
|
|
7767 |
{
|
|
|
7768 |
if (yych <= '/')
|
|
|
7769 |
{
|
|
|
7770 |
goto basic_json_parser_4;
|
|
|
7771 |
}
|
|
|
7772 |
if (yych <= '0')
|
|
|
7773 |
{
|
|
|
7774 |
goto basic_json_parser_13;
|
|
|
7775 |
}
|
|
|
7776 |
goto basic_json_parser_15;
|
|
|
7777 |
}
|
|
|
7778 |
else
|
|
|
7779 |
{
|
|
|
7780 |
if (yych <= ':')
|
|
|
7781 |
{
|
|
|
7782 |
goto basic_json_parser_17;
|
|
|
7783 |
}
|
|
|
7784 |
if (yych == '[')
|
|
|
7785 |
{
|
|
|
7786 |
goto basic_json_parser_19;
|
|
|
7787 |
}
|
|
|
7788 |
goto basic_json_parser_4;
|
|
|
7789 |
}
|
|
|
7790 |
}
|
|
|
7791 |
}
|
|
|
7792 |
else
|
|
|
7793 |
{
|
|
|
7794 |
if (yych <= 't')
|
|
|
7795 |
{
|
|
|
7796 |
if (yych <= 'f')
|
|
|
7797 |
{
|
|
|
7798 |
if (yych <= ']')
|
|
|
7799 |
{
|
|
|
7800 |
goto basic_json_parser_21;
|
|
|
7801 |
}
|
|
|
7802 |
if (yych <= 'e')
|
|
|
7803 |
{
|
|
|
7804 |
goto basic_json_parser_4;
|
|
|
7805 |
}
|
|
|
7806 |
goto basic_json_parser_23;
|
|
|
7807 |
}
|
|
|
7808 |
else
|
|
|
7809 |
{
|
|
|
7810 |
if (yych == 'n')
|
|
|
7811 |
{
|
|
|
7812 |
goto basic_json_parser_24;
|
|
|
7813 |
}
|
|
|
7814 |
if (yych <= 's')
|
|
|
7815 |
{
|
|
|
7816 |
goto basic_json_parser_4;
|
|
|
7817 |
}
|
|
|
7818 |
goto basic_json_parser_25;
|
|
|
7819 |
}
|
|
|
7820 |
}
|
|
|
7821 |
else
|
|
|
7822 |
{
|
|
|
7823 |
if (yych <= '|')
|
|
|
7824 |
{
|
|
|
7825 |
if (yych == '{')
|
|
|
7826 |
{
|
|
|
7827 |
goto basic_json_parser_26;
|
|
|
7828 |
}
|
|
|
7829 |
goto basic_json_parser_4;
|
|
|
7830 |
}
|
|
|
7831 |
else
|
|
|
7832 |
{
|
|
|
7833 |
if (yych <= '}')
|
|
|
7834 |
{
|
|
|
7835 |
goto basic_json_parser_28;
|
|
|
7836 |
}
|
|
|
7837 |
if (yych == 0xEF)
|
|
|
7838 |
{
|
|
|
7839 |
goto basic_json_parser_30;
|
|
|
7840 |
}
|
|
|
7841 |
goto basic_json_parser_4;
|
|
|
7842 |
}
|
|
|
7843 |
}
|
|
|
7844 |
}
|
|
|
7845 |
basic_json_parser_2:
|
|
|
7846 |
++m_cursor;
|
|
|
7847 |
{
|
|
|
7848 |
last_token_type = token_type::end_of_input;
|
|
|
7849 |
break;
|
|
|
7850 |
}
|
|
|
7851 |
basic_json_parser_4:
|
|
|
7852 |
++m_cursor;
|
|
|
7853 |
basic_json_parser_5:
|
|
|
7854 |
{
|
|
|
7855 |
last_token_type = token_type::parse_error;
|
|
|
7856 |
break;
|
|
|
7857 |
}
|
|
|
7858 |
basic_json_parser_6:
|
|
|
7859 |
++m_cursor;
|
|
|
7860 |
if (m_limit <= m_cursor)
|
|
|
7861 |
{
|
|
|
7862 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
7863 |
}
|
|
|
7864 |
yych = *m_cursor;
|
|
|
7865 |
if (yybm[0 + yych] & 32)
|
|
|
7866 |
{
|
|
|
7867 |
goto basic_json_parser_6;
|
|
|
7868 |
}
|
|
|
7869 |
{
|
|
|
7870 |
continue;
|
|
|
7871 |
}
|
|
|
7872 |
basic_json_parser_9:
|
|
|
7873 |
yyaccept = 0;
|
|
|
7874 |
yych = *(m_marker = ++m_cursor);
|
|
|
7875 |
if (yych <= 0x1F)
|
|
|
7876 |
{
|
|
|
7877 |
goto basic_json_parser_5;
|
|
|
7878 |
}
|
|
|
7879 |
goto basic_json_parser_32;
|
|
|
7880 |
basic_json_parser_10:
|
|
|
7881 |
++m_cursor;
|
|
|
7882 |
{
|
|
|
7883 |
last_token_type = token_type::value_separator;
|
|
|
7884 |
break;
|
|
|
7885 |
}
|
|
|
7886 |
basic_json_parser_12:
|
|
|
7887 |
yych = *++m_cursor;
|
|
|
7888 |
if (yych <= '/')
|
|
|
7889 |
{
|
|
|
7890 |
goto basic_json_parser_5;
|
|
|
7891 |
}
|
|
|
7892 |
if (yych <= '0')
|
|
|
7893 |
{
|
|
|
7894 |
goto basic_json_parser_13;
|
|
|
7895 |
}
|
|
|
7896 |
if (yych <= '9')
|
|
|
7897 |
{
|
|
|
7898 |
goto basic_json_parser_15;
|
|
|
7899 |
}
|
|
|
7900 |
goto basic_json_parser_5;
|
|
|
7901 |
basic_json_parser_13:
|
|
|
7902 |
yyaccept = 1;
|
|
|
7903 |
yych = *(m_marker = ++m_cursor);
|
|
|
7904 |
if (yych <= 'D')
|
|
|
7905 |
{
|
|
|
7906 |
if (yych == '.')
|
|
|
7907 |
{
|
|
|
7908 |
goto basic_json_parser_37;
|
|
|
7909 |
}
|
|
|
7910 |
}
|
|
|
7911 |
else
|
|
|
7912 |
{
|
|
|
7913 |
if (yych <= 'E')
|
|
|
7914 |
{
|
|
|
7915 |
goto basic_json_parser_38;
|
|
|
7916 |
}
|
|
|
7917 |
if (yych == 'e')
|
|
|
7918 |
{
|
|
|
7919 |
goto basic_json_parser_38;
|
|
|
7920 |
}
|
|
|
7921 |
}
|
|
|
7922 |
basic_json_parser_14:
|
|
|
7923 |
{
|
|
|
7924 |
last_token_type = token_type::value_number;
|
|
|
7925 |
break;
|
|
|
7926 |
}
|
|
|
7927 |
basic_json_parser_15:
|
|
|
7928 |
yyaccept = 1;
|
|
|
7929 |
m_marker = ++m_cursor;
|
|
|
7930 |
if ((m_limit - m_cursor) < 3)
|
|
|
7931 |
{
|
|
|
7932 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
7933 |
}
|
|
|
7934 |
yych = *m_cursor;
|
|
|
7935 |
if (yybm[0 + yych] & 64)
|
|
|
7936 |
{
|
|
|
7937 |
goto basic_json_parser_15;
|
|
|
7938 |
}
|
|
|
7939 |
if (yych <= 'D')
|
|
|
7940 |
{
|
|
|
7941 |
if (yych == '.')
|
|
|
7942 |
{
|
|
|
7943 |
goto basic_json_parser_37;
|
|
|
7944 |
}
|
|
|
7945 |
goto basic_json_parser_14;
|
|
|
7946 |
}
|
|
|
7947 |
else
|
|
|
7948 |
{
|
|
|
7949 |
if (yych <= 'E')
|
|
|
7950 |
{
|
|
|
7951 |
goto basic_json_parser_38;
|
|
|
7952 |
}
|
|
|
7953 |
if (yych == 'e')
|
|
|
7954 |
{
|
|
|
7955 |
goto basic_json_parser_38;
|
|
|
7956 |
}
|
|
|
7957 |
goto basic_json_parser_14;
|
|
|
7958 |
}
|
|
|
7959 |
basic_json_parser_17:
|
|
|
7960 |
++m_cursor;
|
|
|
7961 |
{
|
|
|
7962 |
last_token_type = token_type::name_separator;
|
|
|
7963 |
break;
|
|
|
7964 |
}
|
|
|
7965 |
basic_json_parser_19:
|
|
|
7966 |
++m_cursor;
|
|
|
7967 |
{
|
|
|
7968 |
last_token_type = token_type::begin_array;
|
|
|
7969 |
break;
|
|
|
7970 |
}
|
|
|
7971 |
basic_json_parser_21:
|
|
|
7972 |
++m_cursor;
|
|
|
7973 |
{
|
|
|
7974 |
last_token_type = token_type::end_array;
|
|
|
7975 |
break;
|
|
|
7976 |
}
|
|
|
7977 |
basic_json_parser_23:
|
|
|
7978 |
yyaccept = 0;
|
|
|
7979 |
yych = *(m_marker = ++m_cursor);
|
|
|
7980 |
if (yych == 'a')
|
|
|
7981 |
{
|
|
|
7982 |
goto basic_json_parser_39;
|
|
|
7983 |
}
|
|
|
7984 |
goto basic_json_parser_5;
|
|
|
7985 |
basic_json_parser_24:
|
|
|
7986 |
yyaccept = 0;
|
|
|
7987 |
yych = *(m_marker = ++m_cursor);
|
|
|
7988 |
if (yych == 'u')
|
|
|
7989 |
{
|
|
|
7990 |
goto basic_json_parser_40;
|
|
|
7991 |
}
|
|
|
7992 |
goto basic_json_parser_5;
|
|
|
7993 |
basic_json_parser_25:
|
|
|
7994 |
yyaccept = 0;
|
|
|
7995 |
yych = *(m_marker = ++m_cursor);
|
|
|
7996 |
if (yych == 'r')
|
|
|
7997 |
{
|
|
|
7998 |
goto basic_json_parser_41;
|
|
|
7999 |
}
|
|
|
8000 |
goto basic_json_parser_5;
|
|
|
8001 |
basic_json_parser_26:
|
|
|
8002 |
++m_cursor;
|
|
|
8003 |
{
|
|
|
8004 |
last_token_type = token_type::begin_object;
|
|
|
8005 |
break;
|
|
|
8006 |
}
|
|
|
8007 |
basic_json_parser_28:
|
|
|
8008 |
++m_cursor;
|
|
|
8009 |
{
|
|
|
8010 |
last_token_type = token_type::end_object;
|
|
|
8011 |
break;
|
|
|
8012 |
}
|
|
|
8013 |
basic_json_parser_30:
|
|
|
8014 |
yyaccept = 0;
|
|
|
8015 |
yych = *(m_marker = ++m_cursor);
|
|
|
8016 |
if (yych == 0xBB)
|
|
|
8017 |
{
|
|
|
8018 |
goto basic_json_parser_42;
|
|
|
8019 |
}
|
|
|
8020 |
goto basic_json_parser_5;
|
|
|
8021 |
basic_json_parser_31:
|
|
|
8022 |
++m_cursor;
|
|
|
8023 |
if (m_limit <= m_cursor)
|
|
|
8024 |
{
|
|
|
8025 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8026 |
}
|
|
|
8027 |
yych = *m_cursor;
|
|
|
8028 |
basic_json_parser_32:
|
|
|
8029 |
if (yybm[0 + yych] & 128)
|
|
|
8030 |
{
|
|
|
8031 |
goto basic_json_parser_31;
|
|
|
8032 |
}
|
|
|
8033 |
if (yych <= 0x1F)
|
|
|
8034 |
{
|
|
|
8035 |
goto basic_json_parser_33;
|
|
|
8036 |
}
|
|
|
8037 |
if (yych <= '"')
|
|
|
8038 |
{
|
|
|
8039 |
goto basic_json_parser_34;
|
|
|
8040 |
}
|
|
|
8041 |
goto basic_json_parser_36;
|
|
|
8042 |
basic_json_parser_33:
|
|
|
8043 |
m_cursor = m_marker;
|
|
|
8044 |
if (yyaccept == 0)
|
|
|
8045 |
{
|
|
|
8046 |
goto basic_json_parser_5;
|
|
|
8047 |
}
|
|
|
8048 |
else
|
|
|
8049 |
{
|
|
|
8050 |
goto basic_json_parser_14;
|
|
|
8051 |
}
|
|
|
8052 |
basic_json_parser_34:
|
|
|
8053 |
++m_cursor;
|
|
|
8054 |
{
|
|
|
8055 |
last_token_type = token_type::value_string;
|
|
|
8056 |
break;
|
|
|
8057 |
}
|
|
|
8058 |
basic_json_parser_36:
|
|
|
8059 |
++m_cursor;
|
|
|
8060 |
if (m_limit <= m_cursor)
|
|
|
8061 |
{
|
|
|
8062 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8063 |
}
|
|
|
8064 |
yych = *m_cursor;
|
|
|
8065 |
if (yych <= 'e')
|
|
|
8066 |
{
|
|
|
8067 |
if (yych <= '/')
|
|
|
8068 |
{
|
|
|
8069 |
if (yych == '"')
|
|
|
8070 |
{
|
|
|
8071 |
goto basic_json_parser_31;
|
|
|
8072 |
}
|
|
|
8073 |
if (yych <= '.')
|
|
|
8074 |
{
|
|
|
8075 |
goto basic_json_parser_33;
|
|
|
8076 |
}
|
|
|
8077 |
goto basic_json_parser_31;
|
|
|
8078 |
}
|
|
|
8079 |
else
|
|
|
8080 |
{
|
|
|
8081 |
if (yych <= '\\')
|
|
|
8082 |
{
|
|
|
8083 |
if (yych <= '[')
|
|
|
8084 |
{
|
|
|
8085 |
goto basic_json_parser_33;
|
|
|
8086 |
}
|
|
|
8087 |
goto basic_json_parser_31;
|
|
|
8088 |
}
|
|
|
8089 |
else
|
|
|
8090 |
{
|
|
|
8091 |
if (yych == 'b')
|
|
|
8092 |
{
|
|
|
8093 |
goto basic_json_parser_31;
|
|
|
8094 |
}
|
|
|
8095 |
goto basic_json_parser_33;
|
|
|
8096 |
}
|
|
|
8097 |
}
|
|
|
8098 |
}
|
|
|
8099 |
else
|
|
|
8100 |
{
|
|
|
8101 |
if (yych <= 'q')
|
|
|
8102 |
{
|
|
|
8103 |
if (yych <= 'f')
|
|
|
8104 |
{
|
|
|
8105 |
goto basic_json_parser_31;
|
|
|
8106 |
}
|
|
|
8107 |
if (yych == 'n')
|
|
|
8108 |
{
|
|
|
8109 |
goto basic_json_parser_31;
|
|
|
8110 |
}
|
|
|
8111 |
goto basic_json_parser_33;
|
|
|
8112 |
}
|
|
|
8113 |
else
|
|
|
8114 |
{
|
|
|
8115 |
if (yych <= 's')
|
|
|
8116 |
{
|
|
|
8117 |
if (yych <= 'r')
|
|
|
8118 |
{
|
|
|
8119 |
goto basic_json_parser_31;
|
|
|
8120 |
}
|
|
|
8121 |
goto basic_json_parser_33;
|
|
|
8122 |
}
|
|
|
8123 |
else
|
|
|
8124 |
{
|
|
|
8125 |
if (yych <= 't')
|
|
|
8126 |
{
|
|
|
8127 |
goto basic_json_parser_31;
|
|
|
8128 |
}
|
|
|
8129 |
if (yych <= 'u')
|
|
|
8130 |
{
|
|
|
8131 |
goto basic_json_parser_43;
|
|
|
8132 |
}
|
|
|
8133 |
goto basic_json_parser_33;
|
|
|
8134 |
}
|
|
|
8135 |
}
|
|
|
8136 |
}
|
|
|
8137 |
basic_json_parser_37:
|
|
|
8138 |
yych = *++m_cursor;
|
|
|
8139 |
if (yych <= '/')
|
|
|
8140 |
{
|
|
|
8141 |
goto basic_json_parser_33;
|
|
|
8142 |
}
|
|
|
8143 |
if (yych <= '9')
|
|
|
8144 |
{
|
|
|
8145 |
goto basic_json_parser_44;
|
|
|
8146 |
}
|
|
|
8147 |
goto basic_json_parser_33;
|
|
|
8148 |
basic_json_parser_38:
|
|
|
8149 |
yych = *++m_cursor;
|
|
|
8150 |
if (yych <= ',')
|
|
|
8151 |
{
|
|
|
8152 |
if (yych == '+')
|
|
|
8153 |
{
|
|
|
8154 |
goto basic_json_parser_46;
|
|
|
8155 |
}
|
|
|
8156 |
goto basic_json_parser_33;
|
|
|
8157 |
}
|
|
|
8158 |
else
|
|
|
8159 |
{
|
|
|
8160 |
if (yych <= '-')
|
|
|
8161 |
{
|
|
|
8162 |
goto basic_json_parser_46;
|
|
|
8163 |
}
|
|
|
8164 |
if (yych <= '/')
|
|
|
8165 |
{
|
|
|
8166 |
goto basic_json_parser_33;
|
|
|
8167 |
}
|
|
|
8168 |
if (yych <= '9')
|
|
|
8169 |
{
|
|
|
8170 |
goto basic_json_parser_47;
|
|
|
8171 |
}
|
|
|
8172 |
goto basic_json_parser_33;
|
|
|
8173 |
}
|
|
|
8174 |
basic_json_parser_39:
|
|
|
8175 |
yych = *++m_cursor;
|
|
|
8176 |
if (yych == 'l')
|
|
|
8177 |
{
|
|
|
8178 |
goto basic_json_parser_49;
|
|
|
8179 |
}
|
|
|
8180 |
goto basic_json_parser_33;
|
|
|
8181 |
basic_json_parser_40:
|
|
|
8182 |
yych = *++m_cursor;
|
|
|
8183 |
if (yych == 'l')
|
|
|
8184 |
{
|
|
|
8185 |
goto basic_json_parser_50;
|
|
|
8186 |
}
|
|
|
8187 |
goto basic_json_parser_33;
|
|
|
8188 |
basic_json_parser_41:
|
|
|
8189 |
yych = *++m_cursor;
|
|
|
8190 |
if (yych == 'u')
|
|
|
8191 |
{
|
|
|
8192 |
goto basic_json_parser_51;
|
|
|
8193 |
}
|
|
|
8194 |
goto basic_json_parser_33;
|
|
|
8195 |
basic_json_parser_42:
|
|
|
8196 |
yych = *++m_cursor;
|
|
|
8197 |
if (yych == 0xBF)
|
|
|
8198 |
{
|
|
|
8199 |
goto basic_json_parser_52;
|
|
|
8200 |
}
|
|
|
8201 |
goto basic_json_parser_33;
|
|
|
8202 |
basic_json_parser_43:
|
|
|
8203 |
++m_cursor;
|
|
|
8204 |
if (m_limit <= m_cursor)
|
|
|
8205 |
{
|
|
|
8206 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8207 |
}
|
|
|
8208 |
yych = *m_cursor;
|
|
|
8209 |
if (yych <= '@')
|
|
|
8210 |
{
|
|
|
8211 |
if (yych <= '/')
|
|
|
8212 |
{
|
|
|
8213 |
goto basic_json_parser_33;
|
|
|
8214 |
}
|
|
|
8215 |
if (yych <= '9')
|
|
|
8216 |
{
|
|
|
8217 |
goto basic_json_parser_54;
|
|
|
8218 |
}
|
|
|
8219 |
goto basic_json_parser_33;
|
|
|
8220 |
}
|
|
|
8221 |
else
|
|
|
8222 |
{
|
|
|
8223 |
if (yych <= 'F')
|
|
|
8224 |
{
|
|
|
8225 |
goto basic_json_parser_54;
|
|
|
8226 |
}
|
|
|
8227 |
if (yych <= '`')
|
|
|
8228 |
{
|
|
|
8229 |
goto basic_json_parser_33;
|
|
|
8230 |
}
|
|
|
8231 |
if (yych <= 'f')
|
|
|
8232 |
{
|
|
|
8233 |
goto basic_json_parser_54;
|
|
|
8234 |
}
|
|
|
8235 |
goto basic_json_parser_33;
|
|
|
8236 |
}
|
|
|
8237 |
basic_json_parser_44:
|
|
|
8238 |
yyaccept = 1;
|
|
|
8239 |
m_marker = ++m_cursor;
|
|
|
8240 |
if ((m_limit - m_cursor) < 3)
|
|
|
8241 |
{
|
|
|
8242 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8243 |
}
|
|
|
8244 |
yych = *m_cursor;
|
|
|
8245 |
if (yych <= 'D')
|
|
|
8246 |
{
|
|
|
8247 |
if (yych <= '/')
|
|
|
8248 |
{
|
|
|
8249 |
goto basic_json_parser_14;
|
|
|
8250 |
}
|
|
|
8251 |
if (yych <= '9')
|
|
|
8252 |
{
|
|
|
8253 |
goto basic_json_parser_44;
|
|
|
8254 |
}
|
|
|
8255 |
goto basic_json_parser_14;
|
|
|
8256 |
}
|
|
|
8257 |
else
|
|
|
8258 |
{
|
|
|
8259 |
if (yych <= 'E')
|
|
|
8260 |
{
|
|
|
8261 |
goto basic_json_parser_38;
|
|
|
8262 |
}
|
|
|
8263 |
if (yych == 'e')
|
|
|
8264 |
{
|
|
|
8265 |
goto basic_json_parser_38;
|
|
|
8266 |
}
|
|
|
8267 |
goto basic_json_parser_14;
|
|
|
8268 |
}
|
|
|
8269 |
basic_json_parser_46:
|
|
|
8270 |
yych = *++m_cursor;
|
|
|
8271 |
if (yych <= '/')
|
|
|
8272 |
{
|
|
|
8273 |
goto basic_json_parser_33;
|
|
|
8274 |
}
|
|
|
8275 |
if (yych >= ':')
|
|
|
8276 |
{
|
|
|
8277 |
goto basic_json_parser_33;
|
|
|
8278 |
}
|
|
|
8279 |
basic_json_parser_47:
|
|
|
8280 |
++m_cursor;
|
|
|
8281 |
if (m_limit <= m_cursor)
|
|
|
8282 |
{
|
|
|
8283 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8284 |
}
|
|
|
8285 |
yych = *m_cursor;
|
|
|
8286 |
if (yych <= '/')
|
|
|
8287 |
{
|
|
|
8288 |
goto basic_json_parser_14;
|
|
|
8289 |
}
|
|
|
8290 |
if (yych <= '9')
|
|
|
8291 |
{
|
|
|
8292 |
goto basic_json_parser_47;
|
|
|
8293 |
}
|
|
|
8294 |
goto basic_json_parser_14;
|
|
|
8295 |
basic_json_parser_49:
|
|
|
8296 |
yych = *++m_cursor;
|
|
|
8297 |
if (yych == 's')
|
|
|
8298 |
{
|
|
|
8299 |
goto basic_json_parser_55;
|
|
|
8300 |
}
|
|
|
8301 |
goto basic_json_parser_33;
|
|
|
8302 |
basic_json_parser_50:
|
|
|
8303 |
yych = *++m_cursor;
|
|
|
8304 |
if (yych == 'l')
|
|
|
8305 |
{
|
|
|
8306 |
goto basic_json_parser_56;
|
|
|
8307 |
}
|
|
|
8308 |
goto basic_json_parser_33;
|
|
|
8309 |
basic_json_parser_51:
|
|
|
8310 |
yych = *++m_cursor;
|
|
|
8311 |
if (yych == 'e')
|
|
|
8312 |
{
|
|
|
8313 |
goto basic_json_parser_58;
|
|
|
8314 |
}
|
|
|
8315 |
goto basic_json_parser_33;
|
|
|
8316 |
basic_json_parser_52:
|
|
|
8317 |
++m_cursor;
|
|
|
8318 |
{
|
|
|
8319 |
continue;
|
|
|
8320 |
}
|
|
|
8321 |
basic_json_parser_54:
|
|
|
8322 |
++m_cursor;
|
|
|
8323 |
if (m_limit <= m_cursor)
|
|
|
8324 |
{
|
|
|
8325 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8326 |
}
|
|
|
8327 |
yych = *m_cursor;
|
|
|
8328 |
if (yych <= '@')
|
|
|
8329 |
{
|
|
|
8330 |
if (yych <= '/')
|
|
|
8331 |
{
|
|
|
8332 |
goto basic_json_parser_33;
|
|
|
8333 |
}
|
|
|
8334 |
if (yych <= '9')
|
|
|
8335 |
{
|
|
|
8336 |
goto basic_json_parser_60;
|
|
|
8337 |
}
|
|
|
8338 |
goto basic_json_parser_33;
|
|
|
8339 |
}
|
|
|
8340 |
else
|
|
|
8341 |
{
|
|
|
8342 |
if (yych <= 'F')
|
|
|
8343 |
{
|
|
|
8344 |
goto basic_json_parser_60;
|
|
|
8345 |
}
|
|
|
8346 |
if (yych <= '`')
|
|
|
8347 |
{
|
|
|
8348 |
goto basic_json_parser_33;
|
|
|
8349 |
}
|
|
|
8350 |
if (yych <= 'f')
|
|
|
8351 |
{
|
|
|
8352 |
goto basic_json_parser_60;
|
|
|
8353 |
}
|
|
|
8354 |
goto basic_json_parser_33;
|
|
|
8355 |
}
|
|
|
8356 |
basic_json_parser_55:
|
|
|
8357 |
yych = *++m_cursor;
|
|
|
8358 |
if (yych == 'e')
|
|
|
8359 |
{
|
|
|
8360 |
goto basic_json_parser_61;
|
|
|
8361 |
}
|
|
|
8362 |
goto basic_json_parser_33;
|
|
|
8363 |
basic_json_parser_56:
|
|
|
8364 |
++m_cursor;
|
|
|
8365 |
{
|
|
|
8366 |
last_token_type = token_type::literal_null;
|
|
|
8367 |
break;
|
|
|
8368 |
}
|
|
|
8369 |
basic_json_parser_58:
|
|
|
8370 |
++m_cursor;
|
|
|
8371 |
{
|
|
|
8372 |
last_token_type = token_type::literal_true;
|
|
|
8373 |
break;
|
|
|
8374 |
}
|
|
|
8375 |
basic_json_parser_60:
|
|
|
8376 |
++m_cursor;
|
|
|
8377 |
if (m_limit <= m_cursor)
|
|
|
8378 |
{
|
|
|
8379 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8380 |
}
|
|
|
8381 |
yych = *m_cursor;
|
|
|
8382 |
if (yych <= '@')
|
|
|
8383 |
{
|
|
|
8384 |
if (yych <= '/')
|
|
|
8385 |
{
|
|
|
8386 |
goto basic_json_parser_33;
|
|
|
8387 |
}
|
|
|
8388 |
if (yych <= '9')
|
|
|
8389 |
{
|
|
|
8390 |
goto basic_json_parser_63;
|
|
|
8391 |
}
|
|
|
8392 |
goto basic_json_parser_33;
|
|
|
8393 |
}
|
|
|
8394 |
else
|
|
|
8395 |
{
|
|
|
8396 |
if (yych <= 'F')
|
|
|
8397 |
{
|
|
|
8398 |
goto basic_json_parser_63;
|
|
|
8399 |
}
|
|
|
8400 |
if (yych <= '`')
|
|
|
8401 |
{
|
|
|
8402 |
goto basic_json_parser_33;
|
|
|
8403 |
}
|
|
|
8404 |
if (yych <= 'f')
|
|
|
8405 |
{
|
|
|
8406 |
goto basic_json_parser_63;
|
|
|
8407 |
}
|
|
|
8408 |
goto basic_json_parser_33;
|
|
|
8409 |
}
|
|
|
8410 |
basic_json_parser_61:
|
|
|
8411 |
++m_cursor;
|
|
|
8412 |
{
|
|
|
8413 |
last_token_type = token_type::literal_false;
|
|
|
8414 |
break;
|
|
|
8415 |
}
|
|
|
8416 |
basic_json_parser_63:
|
|
|
8417 |
++m_cursor;
|
|
|
8418 |
if (m_limit <= m_cursor)
|
|
|
8419 |
{
|
|
|
8420 |
yyfill(); // LCOV_EXCL_LINE;
|
|
|
8421 |
}
|
|
|
8422 |
yych = *m_cursor;
|
|
|
8423 |
if (yych <= '@')
|
|
|
8424 |
{
|
|
|
8425 |
if (yych <= '/')
|
|
|
8426 |
{
|
|
|
8427 |
goto basic_json_parser_33;
|
|
|
8428 |
}
|
|
|
8429 |
if (yych <= '9')
|
|
|
8430 |
{
|
|
|
8431 |
goto basic_json_parser_31;
|
|
|
8432 |
}
|
|
|
8433 |
goto basic_json_parser_33;
|
|
|
8434 |
}
|
|
|
8435 |
else
|
|
|
8436 |
{
|
|
|
8437 |
if (yych <= 'F')
|
|
|
8438 |
{
|
|
|
8439 |
goto basic_json_parser_31;
|
|
|
8440 |
}
|
|
|
8441 |
if (yych <= '`')
|
|
|
8442 |
{
|
|
|
8443 |
goto basic_json_parser_33;
|
|
|
8444 |
}
|
|
|
8445 |
if (yych <= 'f')
|
|
|
8446 |
{
|
|
|
8447 |
goto basic_json_parser_31;
|
|
|
8448 |
}
|
|
|
8449 |
goto basic_json_parser_33;
|
|
|
8450 |
}
|
|
|
8451 |
}
|
|
|
8452 |
|
|
|
8453 |
}
|
|
|
8454 |
|
|
|
8455 |
return last_token_type;
|
|
|
8456 |
}
|
|
|
8457 |
|
|
|
8458 |
/// append data from the stream to the internal buffer
|
|
|
8459 |
void yyfill() noexcept
|
|
|
8460 |
{
|
|
|
8461 |
if (m_stream == nullptr or not * m_stream)
|
|
|
8462 |
{
|
|
|
8463 |
return;
|
|
|
8464 |
}
|
|
|
8465 |
|
|
|
8466 |
const auto offset_start = m_start - m_content;
|
|
|
8467 |
const auto offset_marker = m_marker - m_start;
|
|
|
8468 |
const auto offset_cursor = m_cursor - m_start;
|
|
|
8469 |
|
|
|
8470 |
m_buffer.erase(0, static_cast<size_t>(offset_start));
|
|
|
8471 |
std::string line;
|
|
|
8472 |
assert(m_stream != nullptr);
|
|
|
8473 |
std::getline(*m_stream, line);
|
|
|
8474 |
m_buffer += "\n" + line; // add line with newline symbol
|
|
|
8475 |
|
|
|
8476 |
m_content = reinterpret_cast<const lexer_char_t*>(m_buffer.c_str());
|
|
|
8477 |
assert(m_content != nullptr);
|
|
|
8478 |
m_start = m_content;
|
|
|
8479 |
m_marker = m_start + offset_marker;
|
|
|
8480 |
m_cursor = m_start + offset_cursor;
|
|
|
8481 |
m_limit = m_start + m_buffer.size() - 1;
|
|
|
8482 |
}
|
|
|
8483 |
|
|
|
8484 |
/// return string representation of last read token
|
|
|
8485 |
string_t get_token_string() const
|
|
|
8486 |
{
|
|
|
8487 |
assert(m_start != nullptr);
|
|
|
8488 |
return string_t(reinterpret_cast<typename string_t::const_pointer>(m_start),
|
|
|
8489 |
static_cast<size_t>(m_cursor - m_start));
|
|
|
8490 |
}
|
|
|
8491 |
|
|
|
8492 |
/*!
|
|
|
8493 |
@brief return string value for string tokens
|
|
|
8494 |
|
|
|
8495 |
The function iterates the characters between the opening and closing
|
|
|
8496 |
quotes of the string value. The complete string is the range
|
|
|
8497 |
[m_start,m_cursor). Consequently, we iterate from m_start+1 to
|
|
|
8498 |
m_cursor-1.
|
|
|
8499 |
|
|
|
8500 |
We differentiate two cases:
|
|
|
8501 |
|
|
|
8502 |
1. Escaped characters. In this case, a new character is constructed
|
|
|
8503 |
according to the nature of the escape. Some escapes create new
|
|
|
8504 |
characters (e.g., `"\\n"` is replaced by `"\n"`), some are copied
|
|
|
8505 |
as is (e.g., `"\\\\"`). Furthermore, Unicode escapes of the shape
|
|
|
8506 |
`"\\uxxxx"` need special care. In this case, to_unicode takes care
|
|
|
8507 |
of the construction of the values.
|
|
|
8508 |
2. Unescaped characters are copied as is.
|
|
|
8509 |
|
|
|
8510 |
@pre `m_cursor - m_start >= 2`, meaning the length of the last token
|
|
|
8511 |
is at least 2 bytes which is trivially true for any string (which
|
|
|
8512 |
consists of at least two quotes).
|
|
|
8513 |
|
|
|
8514 |
" c1 c2 c3 ... "
|
|
|
8515 |
^ ^
|
|
|
8516 |
m_start m_cursor
|
|
|
8517 |
|
|
|
8518 |
@complexity Linear in the length of the string.\n
|
|
|
8519 |
|
|
|
8520 |
Lemma: The loop body will always terminate.\n
|
|
|
8521 |
|
|
|
8522 |
Proof (by contradiction): Assume the loop body does not terminate. As
|
|
|
8523 |
the loop body does not contain another loop, one of the called
|
|
|
8524 |
functions must never return. The called functions are `std::strtoul`
|
|
|
8525 |
and to_unicode. Neither function can loop forever, so the loop body
|
|
|
8526 |
will never loop forever which contradicts the assumption that the loop
|
|
|
8527 |
body does not terminate, q.e.d.\n
|
|
|
8528 |
|
|
|
8529 |
Lemma: The loop condition for the for loop is eventually false.\n
|
|
|
8530 |
|
|
|
8531 |
Proof (by contradiction): Assume the loop does not terminate. Due to
|
|
|
8532 |
the above lemma, this can only be due to a tautological loop
|
|
|
8533 |
condition; that is, the loop condition i < m_cursor - 1 must always be
|
|
|
8534 |
true. Let x be the change of i for any loop iteration. Then
|
|
|
8535 |
m_start + 1 + x < m_cursor - 1 must hold to loop indefinitely. This
|
|
|
8536 |
can be rephrased to m_cursor - m_start - 2 > x. With the
|
|
|
8537 |
precondition, we x <= 0, meaning that the loop condition holds
|
|
|
8538 |
indefinitly if i is always decreased. However, observe that the value
|
|
|
8539 |
of i is strictly increasing with each iteration, as it is incremented
|
|
|
8540 |
by 1 in the iteration expression and never decremented inside the loop
|
|
|
8541 |
body. Hence, the loop condition will eventually be false which
|
|
|
8542 |
contradicts the assumption that the loop condition is a tautology,
|
|
|
8543 |
q.e.d.
|
|
|
8544 |
|
|
|
8545 |
@return string value of current token without opening and closing
|
|
|
8546 |
quotes
|
|
|
8547 |
@throw std::out_of_range if to_unicode fails
|
|
|
8548 |
*/
|
|
|
8549 |
string_t get_string() const
|
|
|
8550 |
{
|
|
|
8551 |
assert(m_cursor - m_start >= 2);
|
|
|
8552 |
|
|
|
8553 |
string_t result;
|
|
|
8554 |
result.reserve(static_cast<size_t>(m_cursor - m_start - 2));
|
|
|
8555 |
|
|
|
8556 |
// iterate the result between the quotes
|
|
|
8557 |
for (const lexer_char_t* i = m_start + 1; i < m_cursor - 1; ++i)
|
|
|
8558 |
{
|
|
|
8559 |
// process escaped characters
|
|
|
8560 |
if (*i == '\\')
|
|
|
8561 |
{
|
|
|
8562 |
// read next character
|
|
|
8563 |
++i;
|
|
|
8564 |
|
|
|
8565 |
switch (*i)
|
|
|
8566 |
{
|
|
|
8567 |
// the default escapes
|
|
|
8568 |
case 't':
|
|
|
8569 |
{
|
|
|
8570 |
result += "\t";
|
|
|
8571 |
break;
|
|
|
8572 |
}
|
|
|
8573 |
case 'b':
|
|
|
8574 |
{
|
|
|
8575 |
result += "\b";
|
|
|
8576 |
break;
|
|
|
8577 |
}
|
|
|
8578 |
case 'f':
|
|
|
8579 |
{
|
|
|
8580 |
result += "\f";
|
|
|
8581 |
break;
|
|
|
8582 |
}
|
|
|
8583 |
case 'n':
|
|
|
8584 |
{
|
|
|
8585 |
result += "\n";
|
|
|
8586 |
break;
|
|
|
8587 |
}
|
|
|
8588 |
case 'r':
|
|
|
8589 |
{
|
|
|
8590 |
result += "\r";
|
|
|
8591 |
break;
|
|
|
8592 |
}
|
|
|
8593 |
case '\\':
|
|
|
8594 |
{
|
|
|
8595 |
result += "\\";
|
|
|
8596 |
break;
|
|
|
8597 |
}
|
|
|
8598 |
case '/':
|
|
|
8599 |
{
|
|
|
8600 |
result += "/";
|
|
|
8601 |
break;
|
|
|
8602 |
}
|
|
|
8603 |
case '"':
|
|
|
8604 |
{
|
|
|
8605 |
result += "\"";
|
|
|
8606 |
break;
|
|
|
8607 |
}
|
|
|
8608 |
|
|
|
8609 |
// unicode
|
|
|
8610 |
case 'u':
|
|
|
8611 |
{
|
|
|
8612 |
// get code xxxx from uxxxx
|
|
|
8613 |
auto codepoint = std::strtoul(std::string(reinterpret_cast<typename string_t::const_pointer>(i + 1),
|
|
|
8614 |
4).c_str(), nullptr, 16);
|
|
|
8615 |
|
|
|
8616 |
// check if codepoint is a high surrogate
|
|
|
8617 |
if (codepoint >= 0xD800 and codepoint <= 0xDBFF)
|
|
|
8618 |
{
|
|
|
8619 |
// make sure there is a subsequent unicode
|
|
|
8620 |
if ((i + 6 >= m_limit) or * (i + 5) != '\\' or * (i + 6) != 'u')
|
|
|
8621 |
{
|
|
|
8622 |
throw std::invalid_argument("missing low surrogate");
|
|
|
8623 |
}
|
|
|
8624 |
|
|
|
8625 |
// get code yyyy from uxxxx\uyyyy
|
|
|
8626 |
auto codepoint2 = std::strtoul(std::string(reinterpret_cast<typename string_t::const_pointer>
|
|
|
8627 |
(i + 7), 4).c_str(), nullptr, 16);
|
|
|
8628 |
result += to_unicode(codepoint, codepoint2);
|
|
|
8629 |
// skip the next 10 characters (xxxx\uyyyy)
|
|
|
8630 |
i += 10;
|
|
|
8631 |
}
|
|
|
8632 |
else
|
|
|
8633 |
{
|
|
|
8634 |
// add unicode character(s)
|
|
|
8635 |
result += to_unicode(codepoint);
|
|
|
8636 |
// skip the next four characters (xxxx)
|
|
|
8637 |
i += 4;
|
|
|
8638 |
}
|
|
|
8639 |
break;
|
|
|
8640 |
}
|
|
|
8641 |
}
|
|
|
8642 |
}
|
|
|
8643 |
else
|
|
|
8644 |
{
|
|
|
8645 |
// all other characters are just copied to the end of the
|
|
|
8646 |
// string
|
|
|
8647 |
result.append(1, static_cast<typename string_t::value_type>(*i));
|
|
|
8648 |
}
|
|
|
8649 |
}
|
|
|
8650 |
|
|
|
8651 |
return result;
|
|
|
8652 |
}
|
|
|
8653 |
|
|
|
8654 |
/*!
|
|
|
8655 |
@brief parse floating point number
|
|
|
8656 |
|
|
|
8657 |
This function (and its overloads) serves to select the most approprate
|
|
|
8658 |
standard floating point number parsing function based on the type
|
|
|
8659 |
supplied via the first parameter. Set this to @a
|
|
|
8660 |
static_cast<number_float_t*>(nullptr).
|
|
|
8661 |
|
|
|
8662 |
@param[in] type the @ref number_float_t in use
|
|
|
8663 |
|
|
|
8664 |
@param[in,out] endptr recieves a pointer to the first character after
|
|
|
8665 |
the number
|
|
|
8666 |
|
|
|
8667 |
@return the floating point number
|
|
|
8668 |
*/
|
|
|
8669 |
long double str_to_float_t(long double* /* type */, char** endptr) const
|
|
|
8670 |
{
|
|
|
8671 |
return std::strtold(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
|
|
|
8672 |
}
|
|
|
8673 |
|
|
|
8674 |
/*!
|
|
|
8675 |
@brief parse floating point number
|
|
|
8676 |
|
|
|
8677 |
This function (and its overloads) serves to select the most approprate
|
|
|
8678 |
standard floating point number parsing function based on the type
|
|
|
8679 |
supplied via the first parameter. Set this to @a
|
|
|
8680 |
static_cast<number_float_t*>(nullptr).
|
|
|
8681 |
|
|
|
8682 |
@param[in] type the @ref number_float_t in use
|
|
|
8683 |
|
|
|
8684 |
@param[in,out] endptr recieves a pointer to the first character after
|
|
|
8685 |
the number
|
|
|
8686 |
|
|
|
8687 |
@return the floating point number
|
|
|
8688 |
*/
|
|
|
8689 |
double str_to_float_t(double* /* type */, char** endptr) const
|
|
|
8690 |
{
|
|
|
8691 |
return std::strtod(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
|
|
|
8692 |
}
|
|
|
8693 |
|
|
|
8694 |
/*!
|
|
|
8695 |
@brief parse floating point number
|
|
|
8696 |
|
|
|
8697 |
This function (and its overloads) serves to select the most approprate
|
|
|
8698 |
standard floating point number parsing function based on the type
|
|
|
8699 |
supplied via the first parameter. Set this to @a
|
|
|
8700 |
static_cast<number_float_t*>(nullptr).
|
|
|
8701 |
|
|
|
8702 |
@param[in] type the @ref number_float_t in use
|
|
|
8703 |
|
|
|
8704 |
@param[in,out] endptr recieves a pointer to the first character after
|
|
|
8705 |
the number
|
|
|
8706 |
|
|
|
8707 |
@return the floating point number
|
|
|
8708 |
*/
|
|
|
8709 |
float str_to_float_t(float* /* type */, char** endptr) const
|
|
|
8710 |
{
|
|
|
8711 |
return std::strtof(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
|
|
|
8712 |
}
|
|
|
8713 |
|
|
|
8714 |
/*!
|
|
|
8715 |
@brief return number value for number tokens
|
|
|
8716 |
|
|
|
8717 |
This function translates the last token into the most appropriate
|
|
|
8718 |
number type (either integer, unsigned integer or floating point),
|
|
|
8719 |
which is passed back to the caller via the result parameter.
|
|
|
8720 |
|
|
|
8721 |
This function parses the integer component up to the radix point or
|
|
|
8722 |
exponent while collecting information about the 'floating point
|
|
|
8723 |
representation', which it stores in the result parameter. If there is
|
|
|
8724 |
no radix point or exponent, and the number can fit into a @ref
|
|
|
8725 |
number_integer_t or @ref number_unsigned_t then it sets the result
|
|
|
8726 |
parameter accordingly.
|
|
|
8727 |
|
|
|
8728 |
If the number is a floating point number the number is then parsed
|
|
|
8729 |
using @a std:strtod (or @a std:strtof or @a std::strtold).
|
|
|
8730 |
|
|
|
8731 |
@param[out] result @ref basic_json object to receive the number, or
|
|
|
8732 |
NAN if the conversion read past the current token. The latter case
|
|
|
8733 |
needs to be treated by the caller function.
|
|
|
8734 |
*/
|
|
|
8735 |
void get_number(basic_json& result) const
|
|
|
8736 |
{
|
|
|
8737 |
assert(m_start != nullptr);
|
|
|
8738 |
|
|
|
8739 |
const lexer::lexer_char_t* curptr = m_start;
|
|
|
8740 |
|
|
|
8741 |
// accumulate the integer conversion result (unsigned for now)
|
|
|
8742 |
number_unsigned_t value = 0;
|
|
|
8743 |
|
|
|
8744 |
// maximum absolute value of the relevant integer type
|
|
|
8745 |
number_unsigned_t max;
|
|
|
8746 |
|
|
|
8747 |
// temporarily store the type to avoid unecessary bitfield access
|
|
|
8748 |
value_t type;
|
|
|
8749 |
|
|
|
8750 |
// look for sign
|
|
|
8751 |
if (*curptr == '-')
|
|
|
8752 |
{
|
|
|
8753 |
type = value_t::number_integer;
|
|
|
8754 |
max = static_cast<uint64_t>((std::numeric_limits<number_integer_t>::max)()) + 1;
|
|
|
8755 |
curptr++;
|
|
|
8756 |
}
|
|
|
8757 |
else
|
|
|
8758 |
{
|
|
|
8759 |
type = value_t::number_unsigned;
|
|
|
8760 |
max = static_cast<uint64_t>((std::numeric_limits<number_unsigned_t>::max)());
|
|
|
8761 |
}
|
|
|
8762 |
|
|
|
8763 |
// count the significant figures
|
|
|
8764 |
for (; curptr < m_cursor; curptr++)
|
|
|
8765 |
{
|
|
|
8766 |
// quickly skip tests if a digit
|
|
|
8767 |
if (*curptr < '0' || *curptr > '9')
|
|
|
8768 |
{
|
|
|
8769 |
if (*curptr == '.')
|
|
|
8770 |
{
|
|
|
8771 |
// don't count '.' but change to float
|
|
|
8772 |
type = value_t::number_float;
|
|
|
8773 |
continue;
|
|
|
8774 |
}
|
|
|
8775 |
// assume exponent (if not then will fail parse): change to
|
|
|
8776 |
// float, stop counting and record exponent details
|
|
|
8777 |
type = value_t::number_float;
|
|
|
8778 |
break;
|
|
|
8779 |
}
|
|
|
8780 |
|
|
|
8781 |
// skip if definitely not an integer
|
|
|
8782 |
if (type != value_t::number_float)
|
|
|
8783 |
{
|
|
|
8784 |
// multiply last value by ten and add the new digit
|
|
|
8785 |
auto temp = value * 10 + *curptr - '0';
|
|
|
8786 |
|
|
|
8787 |
// test for overflow
|
|
|
8788 |
if (temp < value || temp > max)
|
|
|
8789 |
{
|
|
|
8790 |
// overflow
|
|
|
8791 |
type = value_t::number_float;
|
|
|
8792 |
}
|
|
|
8793 |
else
|
|
|
8794 |
{
|
|
|
8795 |
// no overflow - save it
|
|
|
8796 |
value = temp;
|
|
|
8797 |
}
|
|
|
8798 |
}
|
|
|
8799 |
}
|
|
|
8800 |
|
|
|
8801 |
// save the value (if not a float)
|
|
|
8802 |
if (type == value_t::number_unsigned)
|
|
|
8803 |
{
|
|
|
8804 |
result.m_value.number_unsigned = value;
|
|
|
8805 |
}
|
|
|
8806 |
else if (type == value_t::number_integer)
|
|
|
8807 |
{
|
|
|
8808 |
result.m_value.number_integer = -static_cast<number_integer_t>(value);
|
|
|
8809 |
}
|
|
|
8810 |
else
|
|
|
8811 |
{
|
|
|
8812 |
// parse with strtod
|
|
|
8813 |
result.m_value.number_float = str_to_float_t(static_cast<number_float_t*>(nullptr), NULL);
|
|
|
8814 |
}
|
|
|
8815 |
|
|
|
8816 |
// save the type
|
|
|
8817 |
result.m_type = type;
|
|
|
8818 |
}
|
|
|
8819 |
|
|
|
8820 |
private:
|
|
|
8821 |
/// optional input stream
|
|
|
8822 |
std::istream* m_stream = nullptr;
|
|
|
8823 |
/// the buffer
|
|
|
8824 |
string_t m_buffer;
|
|
|
8825 |
/// the buffer pointer
|
|
|
8826 |
const lexer_char_t* m_content = nullptr;
|
|
|
8827 |
/// pointer to the beginning of the current symbol
|
|
|
8828 |
const lexer_char_t* m_start = nullptr;
|
|
|
8829 |
/// pointer for backtracking information
|
|
|
8830 |
const lexer_char_t* m_marker = nullptr;
|
|
|
8831 |
/// pointer to the current symbol
|
|
|
8832 |
const lexer_char_t* m_cursor = nullptr;
|
|
|
8833 |
/// pointer to the end of the buffer
|
|
|
8834 |
const lexer_char_t* m_limit = nullptr;
|
|
|
8835 |
/// the last token type
|
|
|
8836 |
token_type last_token_type = token_type::end_of_input;
|
|
|
8837 |
};
|
|
|
8838 |
|
|
|
8839 |
/*!
|
|
|
8840 |
@brief syntax analysis
|
|
|
8841 |
|
|
|
8842 |
This class implements a recursive decent parser.
|
|
|
8843 |
*/
|
|
|
8844 |
class parser
|
|
|
8845 |
{
|
|
|
8846 |
public:
|
|
|
8847 |
/// constructor for strings
|
|
|
8848 |
parser(const string_t& s, const parser_callback_t cb = nullptr) noexcept
|
|
|
8849 |
: callback(cb), m_lexer(s)
|
|
|
8850 |
{
|
|
|
8851 |
// read first token
|
|
|
8852 |
get_token();
|
|
|
8853 |
}
|
|
|
8854 |
|
|
|
8855 |
/// a parser reading from an input stream
|
|
|
8856 |
parser(std::istream& _is, const parser_callback_t cb = nullptr) noexcept
|
|
|
8857 |
: callback(cb), m_lexer(&_is)
|
|
|
8858 |
{
|
|
|
8859 |
// read first token
|
|
|
8860 |
get_token();
|
|
|
8861 |
}
|
|
|
8862 |
|
|
|
8863 |
/// public parser interface
|
|
|
8864 |
basic_json parse()
|
|
|
8865 |
{
|
|
|
8866 |
basic_json result = parse_internal(true);
|
|
|
8867 |
result.assert_invariant();
|
|
|
8868 |
|
|
|
8869 |
expect(lexer::token_type::end_of_input);
|
|
|
8870 |
|
|
|
8871 |
// return parser result and replace it with null in case the
|
|
|
8872 |
// top-level value was discarded by the callback function
|
|
|
8873 |
return result.is_discarded() ? basic_json() : std::move(result);
|
|
|
8874 |
}
|
|
|
8875 |
|
|
|
8876 |
private:
|
|
|
8877 |
/// the actual parser
|
|
|
8878 |
basic_json parse_internal(bool keep)
|
|
|
8879 |
{
|
|
|
8880 |
auto result = basic_json(value_t::discarded);
|
|
|
8881 |
|
|
|
8882 |
switch (last_token)
|
|
|
8883 |
{
|
|
|
8884 |
case lexer::token_type::begin_object:
|
|
|
8885 |
{
|
|
|
8886 |
if (keep and (not callback or (keep = callback(depth++, parse_event_t::object_start, result))))
|
|
|
8887 |
{
|
|
|
8888 |
// explicitly set result to object to cope with {}
|
|
|
8889 |
result.m_type = value_t::object;
|
|
|
8890 |
result.m_value = value_t::object;
|
|
|
8891 |
}
|
|
|
8892 |
|
|
|
8893 |
// read next token
|
|
|
8894 |
get_token();
|
|
|
8895 |
|
|
|
8896 |
// closing } -> we are done
|
|
|
8897 |
if (last_token == lexer::token_type::end_object)
|
|
|
8898 |
{
|
|
|
8899 |
get_token();
|
|
|
8900 |
if (keep and callback and not callback(--depth, parse_event_t::object_end, result))
|
|
|
8901 |
{
|
|
|
8902 |
result = basic_json(value_t::discarded);
|
|
|
8903 |
}
|
|
|
8904 |
return result;
|
|
|
8905 |
}
|
|
|
8906 |
|
|
|
8907 |
// no comma is expected here
|
|
|
8908 |
unexpect(lexer::token_type::value_separator);
|
|
|
8909 |
|
|
|
8910 |
// otherwise: parse key-value pairs
|
|
|
8911 |
do
|
|
|
8912 |
{
|
|
|
8913 |
// ugly, but could be fixed with loop reorganization
|
|
|
8914 |
if (last_token == lexer::token_type::value_separator)
|
|
|
8915 |
{
|
|
|
8916 |
get_token();
|
|
|
8917 |
}
|
|
|
8918 |
|
|
|
8919 |
// store key
|
|
|
8920 |
expect(lexer::token_type::value_string);
|
|
|
8921 |
const auto key = m_lexer.get_string();
|
|
|
8922 |
|
|
|
8923 |
bool keep_tag = false;
|
|
|
8924 |
if (keep)
|
|
|
8925 |
{
|
|
|
8926 |
if (callback)
|
|
|
8927 |
{
|
|
|
8928 |
basic_json k(key);
|
|
|
8929 |
keep_tag = callback(depth, parse_event_t::key, k);
|
|
|
8930 |
}
|
|
|
8931 |
else
|
|
|
8932 |
{
|
|
|
8933 |
keep_tag = true;
|
|
|
8934 |
}
|
|
|
8935 |
}
|
|
|
8936 |
|
|
|
8937 |
// parse separator (:)
|
|
|
8938 |
get_token();
|
|
|
8939 |
expect(lexer::token_type::name_separator);
|
|
|
8940 |
|
|
|
8941 |
// parse and add value
|
|
|
8942 |
get_token();
|
|
|
8943 |
auto value = parse_internal(keep);
|
|
|
8944 |
if (keep and keep_tag and not value.is_discarded())
|
|
|
8945 |
{
|
|
|
8946 |
result[key] = std::move(value);
|
|
|
8947 |
}
|
|
|
8948 |
}
|
|
|
8949 |
while (last_token == lexer::token_type::value_separator);
|
|
|
8950 |
|
|
|
8951 |
// closing }
|
|
|
8952 |
expect(lexer::token_type::end_object);
|
|
|
8953 |
get_token();
|
|
|
8954 |
if (keep and callback and not callback(--depth, parse_event_t::object_end, result))
|
|
|
8955 |
{
|
|
|
8956 |
result = basic_json(value_t::discarded);
|
|
|
8957 |
}
|
|
|
8958 |
|
|
|
8959 |
return result;
|
|
|
8960 |
}
|
|
|
8961 |
|
|
|
8962 |
case lexer::token_type::begin_array:
|
|
|
8963 |
{
|
|
|
8964 |
if (keep and (not callback or (keep = callback(depth++, parse_event_t::array_start, result))))
|
|
|
8965 |
{
|
|
|
8966 |
// explicitly set result to object to cope with []
|
|
|
8967 |
result.m_type = value_t::array;
|
|
|
8968 |
result.m_value = value_t::array;
|
|
|
8969 |
}
|
|
|
8970 |
|
|
|
8971 |
// read next token
|
|
|
8972 |
get_token();
|
|
|
8973 |
|
|
|
8974 |
// closing ] -> we are done
|
|
|
8975 |
if (last_token == lexer::token_type::end_array)
|
|
|
8976 |
{
|
|
|
8977 |
get_token();
|
|
|
8978 |
if (callback and not callback(--depth, parse_event_t::array_end, result))
|
|
|
8979 |
{
|
|
|
8980 |
result = basic_json(value_t::discarded);
|
|
|
8981 |
}
|
|
|
8982 |
return result;
|
|
|
8983 |
}
|
|
|
8984 |
|
|
|
8985 |
// no comma is expected here
|
|
|
8986 |
unexpect(lexer::token_type::value_separator);
|
|
|
8987 |
|
|
|
8988 |
// otherwise: parse values
|
|
|
8989 |
do
|
|
|
8990 |
{
|
|
|
8991 |
// ugly, but could be fixed with loop reorganization
|
|
|
8992 |
if (last_token == lexer::token_type::value_separator)
|
|
|
8993 |
{
|
|
|
8994 |
get_token();
|
|
|
8995 |
}
|
|
|
8996 |
|
|
|
8997 |
// parse value
|
|
|
8998 |
auto value = parse_internal(keep);
|
|
|
8999 |
if (keep and not value.is_discarded())
|
|
|
9000 |
{
|
|
|
9001 |
result.push_back(std::move(value));
|
|
|
9002 |
}
|
|
|
9003 |
}
|
|
|
9004 |
while (last_token == lexer::token_type::value_separator);
|
|
|
9005 |
|
|
|
9006 |
// closing ]
|
|
|
9007 |
expect(lexer::token_type::end_array);
|
|
|
9008 |
get_token();
|
|
|
9009 |
if (keep and callback and not callback(--depth, parse_event_t::array_end, result))
|
|
|
9010 |
{
|
|
|
9011 |
result = basic_json(value_t::discarded);
|
|
|
9012 |
}
|
|
|
9013 |
|
|
|
9014 |
return result;
|
|
|
9015 |
}
|
|
|
9016 |
|
|
|
9017 |
case lexer::token_type::literal_null:
|
|
|
9018 |
{
|
|
|
9019 |
get_token();
|
|
|
9020 |
result.m_type = value_t::null;
|
|
|
9021 |
break;
|
|
|
9022 |
}
|
|
|
9023 |
|
|
|
9024 |
case lexer::token_type::value_string:
|
|
|
9025 |
{
|
|
|
9026 |
const auto s = m_lexer.get_string();
|
|
|
9027 |
get_token();
|
|
|
9028 |
result = basic_json(s);
|
|
|
9029 |
break;
|
|
|
9030 |
}
|
|
|
9031 |
|
|
|
9032 |
case lexer::token_type::literal_true:
|
|
|
9033 |
{
|
|
|
9034 |
get_token();
|
|
|
9035 |
result.m_type = value_t::boolean;
|
|
|
9036 |
result.m_value = true;
|
|
|
9037 |
break;
|
|
|
9038 |
}
|
|
|
9039 |
|
|
|
9040 |
case lexer::token_type::literal_false:
|
|
|
9041 |
{
|
|
|
9042 |
get_token();
|
|
|
9043 |
result.m_type = value_t::boolean;
|
|
|
9044 |
result.m_value = false;
|
|
|
9045 |
break;
|
|
|
9046 |
}
|
|
|
9047 |
|
|
|
9048 |
case lexer::token_type::value_number:
|
|
|
9049 |
{
|
|
|
9050 |
m_lexer.get_number(result);
|
|
|
9051 |
get_token();
|
|
|
9052 |
break;
|
|
|
9053 |
}
|
|
|
9054 |
|
|
|
9055 |
default:
|
|
|
9056 |
{
|
|
|
9057 |
// the last token was unexpected
|
|
|
9058 |
unexpect(last_token);
|
|
|
9059 |
}
|
|
|
9060 |
}
|
|
|
9061 |
|
|
|
9062 |
if (keep and callback and not callback(depth, parse_event_t::value, result))
|
|
|
9063 |
{
|
|
|
9064 |
result = basic_json(value_t::discarded);
|
|
|
9065 |
}
|
|
|
9066 |
return result;
|
|
|
9067 |
}
|
|
|
9068 |
|
|
|
9069 |
/// get next token from lexer
|
|
|
9070 |
typename lexer::token_type get_token() noexcept
|
|
|
9071 |
{
|
|
|
9072 |
last_token = m_lexer.scan();
|
|
|
9073 |
return last_token;
|
|
|
9074 |
}
|
|
|
9075 |
|
|
|
9076 |
void expect(typename lexer::token_type t) const
|
|
|
9077 |
{
|
|
|
9078 |
if (t != last_token)
|
|
|
9079 |
{
|
|
|
9080 |
std::string error_msg = "parse error - unexpected ";
|
|
|
9081 |
error_msg += (last_token == lexer::token_type::parse_error ? ("'" + m_lexer.get_token_string() +
|
|
|
9082 |
"'") :
|
|
|
9083 |
lexer::token_type_name(last_token));
|
|
|
9084 |
error_msg += "; expected " + lexer::token_type_name(t);
|
|
|
9085 |
throw std::invalid_argument(error_msg);
|
|
|
9086 |
}
|
|
|
9087 |
}
|
|
|
9088 |
|
|
|
9089 |
void unexpect(typename lexer::token_type t) const
|
|
|
9090 |
{
|
|
|
9091 |
if (t == last_token)
|
|
|
9092 |
{
|
|
|
9093 |
std::string error_msg = "parse error - unexpected ";
|
|
|
9094 |
error_msg += (last_token == lexer::token_type::parse_error ? ("'" + m_lexer.get_token_string() +
|
|
|
9095 |
"'") :
|
|
|
9096 |
lexer::token_type_name(last_token));
|
|
|
9097 |
throw std::invalid_argument(error_msg);
|
|
|
9098 |
}
|
|
|
9099 |
}
|
|
|
9100 |
|
|
|
9101 |
private:
|
|
|
9102 |
/// current level of recursion
|
|
|
9103 |
int depth = 0;
|
|
|
9104 |
/// callback function
|
|
|
9105 |
const parser_callback_t callback = nullptr;
|
|
|
9106 |
/// the type of the last read token
|
|
|
9107 |
typename lexer::token_type last_token = lexer::token_type::uninitialized;
|
|
|
9108 |
/// the lexer
|
|
|
9109 |
lexer m_lexer;
|
|
|
9110 |
};
|
|
|
9111 |
|
|
|
9112 |
public:
|
|
|
9113 |
/*!
|
|
|
9114 |
@brief JSON Pointer
|
|
|
9115 |
|
|
|
9116 |
A JSON pointer defines a string syntax for identifying a specific value
|
|
|
9117 |
within a JSON document. It can be used with functions `at` and
|
|
|
9118 |
`operator[]`. Furthermore, JSON pointers are the base for JSON patches.
|
|
|
9119 |
|
|
|
9120 |
@sa [RFC 6901](https://tools.ietf.org/html/rfc6901)
|
|
|
9121 |
|
|
|
9122 |
@since version 2.0.0
|
|
|
9123 |
*/
|
|
|
9124 |
class json_pointer
|
|
|
9125 |
{
|
|
|
9126 |
/// allow basic_json to access private members
|
|
|
9127 |
friend class basic_json;
|
|
|
9128 |
|
|
|
9129 |
public:
|
|
|
9130 |
/*!
|
|
|
9131 |
@brief create JSON pointer
|
|
|
9132 |
|
|
|
9133 |
Create a JSON pointer according to the syntax described in
|
|
|
9134 |
[Section 3 of RFC6901](https://tools.ietf.org/html/rfc6901#section-3).
|
|
|
9135 |
|
|
|
9136 |
@param[in] s string representing the JSON pointer; if omitted, the
|
|
|
9137 |
empty string is assumed which references the whole JSON
|
|
|
9138 |
value
|
|
|
9139 |
|
|
|
9140 |
@throw std::domain_error if reference token is nonempty and does not
|
|
|
9141 |
begin with a slash (`/`); example: `"JSON pointer must be empty or
|
|
|
9142 |
begin with /"`
|
|
|
9143 |
@throw std::domain_error if a tilde (`~`) is not followed by `0`
|
|
|
9144 |
(representing `~`) or `1` (representing `/`); example: `"escape error:
|
|
|
9145 |
~ must be followed with 0 or 1"`
|
|
|
9146 |
|
|
|
9147 |
@liveexample{The example shows the construction several valid JSON
|
|
|
9148 |
pointers as well as the exceptional behavior.,json_pointer}
|
|
|
9149 |
|
|
|
9150 |
@since version 2.0.0
|
|
|
9151 |
*/
|
|
|
9152 |
explicit json_pointer(const std::string& s = "")
|
|
|
9153 |
: reference_tokens(split(s))
|
|
|
9154 |
{}
|
|
|
9155 |
|
|
|
9156 |
/*!
|
|
|
9157 |
@brief return a string representation of the JSON pointer
|
|
|
9158 |
|
|
|
9159 |
@invariant For each JSON pointer `ptr`, it holds:
|
|
|
9160 |
@code {.cpp}
|
|
|
9161 |
ptr == json_pointer(ptr.to_string());
|
|
|
9162 |
@endcode
|
|
|
9163 |
|
|
|
9164 |
@return a string representation of the JSON pointer
|
|
|
9165 |
|
|
|
9166 |
@liveexample{The example shows the result of `to_string`.,
|
|
|
9167 |
json_pointer__to_string}
|
|
|
9168 |
|
|
|
9169 |
@since version 2.0.0
|
|
|
9170 |
*/
|
|
|
9171 |
std::string to_string() const noexcept
|
|
|
9172 |
{
|
|
|
9173 |
return std::accumulate(reference_tokens.begin(),
|
|
|
9174 |
reference_tokens.end(), std::string{},
|
|
|
9175 |
[](const std::string & a, const std::string & b)
|
|
|
9176 |
{
|
|
|
9177 |
return a + "/" + escape(b);
|
|
|
9178 |
});
|
|
|
9179 |
}
|
|
|
9180 |
|
|
|
9181 |
/// @copydoc to_string()
|
|
|
9182 |
operator std::string() const
|
|
|
9183 |
{
|
|
|
9184 |
return to_string();
|
|
|
9185 |
}
|
|
|
9186 |
|
|
|
9187 |
private:
|
|
|
9188 |
/// remove and return last reference pointer
|
|
|
9189 |
std::string pop_back()
|
|
|
9190 |
{
|
|
|
9191 |
if (is_root())
|
|
|
9192 |
{
|
|
|
9193 |
throw std::domain_error("JSON pointer has no parent");
|
|
|
9194 |
}
|
|
|
9195 |
|
|
|
9196 |
auto last = reference_tokens.back();
|
|
|
9197 |
reference_tokens.pop_back();
|
|
|
9198 |
return last;
|
|
|
9199 |
}
|
|
|
9200 |
|
|
|
9201 |
/// return whether pointer points to the root document
|
|
|
9202 |
bool is_root() const
|
|
|
9203 |
{
|
|
|
9204 |
return reference_tokens.empty();
|
|
|
9205 |
}
|
|
|
9206 |
|
|
|
9207 |
json_pointer top() const
|
|
|
9208 |
{
|
|
|
9209 |
if (is_root())
|
|
|
9210 |
{
|
|
|
9211 |
throw std::domain_error("JSON pointer has no parent");
|
|
|
9212 |
}
|
|
|
9213 |
|
|
|
9214 |
json_pointer result = *this;
|
|
|
9215 |
result.reference_tokens = {reference_tokens[0]};
|
|
|
9216 |
return result;
|
|
|
9217 |
}
|
|
|
9218 |
|
|
|
9219 |
/*!
|
|
|
9220 |
@brief create and return a reference to the pointed to value
|
|
|
9221 |
|
|
|
9222 |
@complexity Linear in the number of reference tokens.
|
|
|
9223 |
*/
|
|
|
9224 |
reference get_and_create(reference j) const
|
|
|
9225 |
{
|
|
|
9226 |
pointer result = &j;
|
|
|
9227 |
|
|
|
9228 |
// in case no reference tokens exist, return a reference to the
|
|
|
9229 |
// JSON value j which will be overwritten by a primitive value
|
|
|
9230 |
for (const auto& reference_token : reference_tokens)
|
|
|
9231 |
{
|
|
|
9232 |
switch (result->m_type)
|
|
|
9233 |
{
|
|
|
9234 |
case value_t::null:
|
|
|
9235 |
{
|
|
|
9236 |
if (reference_token == "0")
|
|
|
9237 |
{
|
|
|
9238 |
// start a new array if reference token is 0
|
|
|
9239 |
result = &result->operator[](0);
|
|
|
9240 |
}
|
|
|
9241 |
else
|
|
|
9242 |
{
|
|
|
9243 |
// start a new object otherwise
|
|
|
9244 |
result = &result->operator[](reference_token);
|
|
|
9245 |
}
|
|
|
9246 |
break;
|
|
|
9247 |
}
|
|
|
9248 |
|
|
|
9249 |
case value_t::object:
|
|
|
9250 |
{
|
|
|
9251 |
// create an entry in the object
|
|
|
9252 |
result = &result->operator[](reference_token);
|
|
|
9253 |
break;
|
|
|
9254 |
}
|
|
|
9255 |
|
|
|
9256 |
case value_t::array:
|
|
|
9257 |
{
|
|
|
9258 |
// create an entry in the array
|
|
|
9259 |
result = &result->operator[](static_cast<size_type>(std::stoi(reference_token)));
|
|
|
9260 |
break;
|
|
|
9261 |
}
|
|
|
9262 |
|
|
|
9263 |
/*
|
|
|
9264 |
The following code is only reached if there exists a
|
|
|
9265 |
reference token _and_ the current value is primitive. In
|
|
|
9266 |
this case, we have an error situation, because primitive
|
|
|
9267 |
values may only occur as single value; that is, with an
|
|
|
9268 |
empty list of reference tokens.
|
|
|
9269 |
*/
|
|
|
9270 |
default:
|
|
|
9271 |
{
|
|
|
9272 |
throw std::domain_error("invalid value to unflatten");
|
|
|
9273 |
}
|
|
|
9274 |
}
|
|
|
9275 |
}
|
|
|
9276 |
|
|
|
9277 |
return *result;
|
|
|
9278 |
}
|
|
|
9279 |
|
|
|
9280 |
/*!
|
|
|
9281 |
@brief return a reference to the pointed to value
|
|
|
9282 |
|
|
|
9283 |
@param[in] ptr a JSON value
|
|
|
9284 |
|
|
|
9285 |
@return reference to the JSON value pointed to by the JSON pointer
|
|
|
9286 |
|
|
|
9287 |
@complexity Linear in the length of the JSON pointer.
|
|
|
9288 |
|
|
|
9289 |
@throw std::out_of_range if the JSON pointer can not be resolved
|
|
|
9290 |
@throw std::domain_error if an array index begins with '0'
|
|
|
9291 |
@throw std::invalid_argument if an array index was not a number
|
|
|
9292 |
*/
|
|
|
9293 |
reference get_unchecked(pointer ptr) const
|
|
|
9294 |
{
|
|
|
9295 |
for (const auto& reference_token : reference_tokens)
|
|
|
9296 |
{
|
|
|
9297 |
switch (ptr->m_type)
|
|
|
9298 |
{
|
|
|
9299 |
case value_t::object:
|
|
|
9300 |
{
|
|
|
9301 |
// use unchecked object access
|
|
|
9302 |
ptr = &ptr->operator[](reference_token);
|
|
|
9303 |
break;
|
|
|
9304 |
}
|
|
|
9305 |
|
|
|
9306 |
case value_t::array:
|
|
|
9307 |
{
|
|
|
9308 |
// error condition (cf. RFC 6901, Sect. 4)
|
|
|
9309 |
if (reference_token.size() > 1 and reference_token[0] == '0')
|
|
|
9310 |
{
|
|
|
9311 |
throw std::domain_error("array index must not begin with '0'");
|
|
|
9312 |
}
|
|
|
9313 |
|
|
|
9314 |
if (reference_token == "-")
|
|
|
9315 |
{
|
|
|
9316 |
// explicityly treat "-" as index beyond the end
|
|
|
9317 |
ptr = &ptr->operator[](ptr->m_value.array->size());
|
|
|
9318 |
}
|
|
|
9319 |
else
|
|
|
9320 |
{
|
|
|
9321 |
// convert array index to number; unchecked access
|
|
|
9322 |
ptr = &ptr->operator[](static_cast<size_type>(std::stoi(reference_token)));
|
|
|
9323 |
}
|
|
|
9324 |
break;
|
|
|
9325 |
}
|
|
|
9326 |
|
|
|
9327 |
default:
|
|
|
9328 |
{
|
|
|
9329 |
throw std::out_of_range("unresolved reference token '" + reference_token + "'");
|
|
|
9330 |
}
|
|
|
9331 |
}
|
|
|
9332 |
}
|
|
|
9333 |
|
|
|
9334 |
return *ptr;
|
|
|
9335 |
}
|
|
|
9336 |
|
|
|
9337 |
reference get_checked(pointer ptr) const
|
|
|
9338 |
{
|
|
|
9339 |
for (const auto& reference_token : reference_tokens)
|
|
|
9340 |
{
|
|
|
9341 |
switch (ptr->m_type)
|
|
|
9342 |
{
|
|
|
9343 |
case value_t::object:
|
|
|
9344 |
{
|
|
|
9345 |
// note: at performs range check
|
|
|
9346 |
ptr = &ptr->at(reference_token);
|
|
|
9347 |
break;
|
|
|
9348 |
}
|
|
|
9349 |
|
|
|
9350 |
case value_t::array:
|
|
|
9351 |
{
|
|
|
9352 |
if (reference_token == "-")
|
|
|
9353 |
{
|
|
|
9354 |
// "-" always fails the range check
|
|
|
9355 |
throw std::out_of_range("array index '-' (" +
|
|
|
9356 |
std::to_string(ptr->m_value.array->size()) +
|
|
|
9357 |
") is out of range");
|
|
|
9358 |
}
|
|
|
9359 |
|
|
|
9360 |
// error condition (cf. RFC 6901, Sect. 4)
|
|
|
9361 |
if (reference_token.size() > 1 and reference_token[0] == '0')
|
|
|
9362 |
{
|
|
|
9363 |
throw std::domain_error("array index must not begin with '0'");
|
|
|
9364 |
}
|
|
|
9365 |
|
|
|
9366 |
// note: at performs range check
|
|
|
9367 |
ptr = &ptr->at(static_cast<size_type>(std::stoi(reference_token)));
|
|
|
9368 |
break;
|
|
|
9369 |
}
|
|
|
9370 |
|
|
|
9371 |
default:
|
|
|
9372 |
{
|
|
|
9373 |
throw std::out_of_range("unresolved reference token '" + reference_token + "'");
|
|
|
9374 |
}
|
|
|
9375 |
}
|
|
|
9376 |
}
|
|
|
9377 |
|
|
|
9378 |
return *ptr;
|
|
|
9379 |
}
|
|
|
9380 |
|
|
|
9381 |
/*!
|
|
|
9382 |
@brief return a const reference to the pointed to value
|
|
|
9383 |
|
|
|
9384 |
@param[in] ptr a JSON value
|
|
|
9385 |
|
|
|
9386 |
@return const reference to the JSON value pointed to by the JSON
|
|
|
9387 |
pointer
|
|
|
9388 |
*/
|
|
|
9389 |
const_reference get_unchecked(const_pointer ptr) const
|
|
|
9390 |
{
|
|
|
9391 |
for (const auto& reference_token : reference_tokens)
|
|
|
9392 |
{
|
|
|
9393 |
switch (ptr->m_type)
|
|
|
9394 |
{
|
|
|
9395 |
case value_t::object:
|
|
|
9396 |
{
|
|
|
9397 |
// use unchecked object access
|
|
|
9398 |
ptr = &ptr->operator[](reference_token);
|
|
|
9399 |
break;
|
|
|
9400 |
}
|
|
|
9401 |
|
|
|
9402 |
case value_t::array:
|
|
|
9403 |
{
|
|
|
9404 |
if (reference_token == "-")
|
|
|
9405 |
{
|
|
|
9406 |
// "-" cannot be used for const access
|
|
|
9407 |
throw std::out_of_range("array index '-' (" +
|
|
|
9408 |
std::to_string(ptr->m_value.array->size()) +
|
|
|
9409 |
") is out of range");
|
|
|
9410 |
}
|
|
|
9411 |
|
|
|
9412 |
// error condition (cf. RFC 6901, Sect. 4)
|
|
|
9413 |
if (reference_token.size() > 1 and reference_token[0] == '0')
|
|
|
9414 |
{
|
|
|
9415 |
throw std::domain_error("array index must not begin with '0'");
|
|
|
9416 |
}
|
|
|
9417 |
|
|
|
9418 |
// use unchecked array access
|
|
|
9419 |
ptr = &ptr->operator[](static_cast<size_type>(std::stoi(reference_token)));
|
|
|
9420 |
break;
|
|
|
9421 |
}
|
|
|
9422 |
|
|
|
9423 |
default:
|
|
|
9424 |
{
|
|
|
9425 |
throw std::out_of_range("unresolved reference token '" + reference_token + "'");
|
|
|
9426 |
}
|
|
|
9427 |
}
|
|
|
9428 |
}
|
|
|
9429 |
|
|
|
9430 |
return *ptr;
|
|
|
9431 |
}
|
|
|
9432 |
|
|
|
9433 |
const_reference get_checked(const_pointer ptr) const
|
|
|
9434 |
{
|
|
|
9435 |
for (const auto& reference_token : reference_tokens)
|
|
|
9436 |
{
|
|
|
9437 |
switch (ptr->m_type)
|
|
|
9438 |
{
|
|
|
9439 |
case value_t::object:
|
|
|
9440 |
{
|
|
|
9441 |
// note: at performs range check
|
|
|
9442 |
ptr = &ptr->at(reference_token);
|
|
|
9443 |
break;
|
|
|
9444 |
}
|
|
|
9445 |
|
|
|
9446 |
case value_t::array:
|
|
|
9447 |
{
|
|
|
9448 |
if (reference_token == "-")
|
|
|
9449 |
{
|
|
|
9450 |
// "-" always fails the range check
|
|
|
9451 |
throw std::out_of_range("array index '-' (" +
|
|
|
9452 |
std::to_string(ptr->m_value.array->size()) +
|
|
|
9453 |
") is out of range");
|
|
|
9454 |
}
|
|
|
9455 |
|
|
|
9456 |
// error condition (cf. RFC 6901, Sect. 4)
|
|
|
9457 |
if (reference_token.size() > 1 and reference_token[0] == '0')
|
|
|
9458 |
{
|
|
|
9459 |
throw std::domain_error("array index must not begin with '0'");
|
|
|
9460 |
}
|
|
|
9461 |
|
|
|
9462 |
// note: at performs range check
|
|
|
9463 |
ptr = &ptr->at(static_cast<size_type>(std::stoi(reference_token)));
|
|
|
9464 |
break;
|
|
|
9465 |
}
|
|
|
9466 |
|
|
|
9467 |
default:
|
|
|
9468 |
{
|
|
|
9469 |
throw std::out_of_range("unresolved reference token '" + reference_token + "'");
|
|
|
9470 |
}
|
|
|
9471 |
}
|
|
|
9472 |
}
|
|
|
9473 |
|
|
|
9474 |
return *ptr;
|
|
|
9475 |
}
|
|
|
9476 |
|
|
|
9477 |
/// split the string input to reference tokens
|
|
|
9478 |
static std::vector<std::string> split(std::string reference_string)
|
|
|
9479 |
{
|
|
|
9480 |
std::vector<std::string> result;
|
|
|
9481 |
|
|
|
9482 |
// special case: empty reference string -> no reference tokens
|
|
|
9483 |
if (reference_string.empty())
|
|
|
9484 |
{
|
|
|
9485 |
return result;
|
|
|
9486 |
}
|
|
|
9487 |
|
|
|
9488 |
// check if nonempty reference string begins with slash
|
|
|
9489 |
if (reference_string[0] != '/')
|
|
|
9490 |
{
|
|
|
9491 |
throw std::domain_error("JSON pointer must be empty or begin with '/'");
|
|
|
9492 |
}
|
|
|
9493 |
|
|
|
9494 |
// extract the reference tokens:
|
|
|
9495 |
// - slash: position of the last read slash (or end of string)
|
|
|
9496 |
// - start: position after the previous slash
|
|
|
9497 |
for (
|
|
|
9498 |
// search for the first slash after the first character
|
|
|
9499 |
size_t slash = reference_string.find_first_of("/", 1),
|
|
|
9500 |
// set the beginning of the first reference token
|
|
|
9501 |
start = 1;
|
|
|
9502 |
// we can stop if start == string::npos+1 = 0
|
|
|
9503 |
start != 0;
|
|
|
9504 |
// set the beginning of the next reference token
|
|
|
9505 |
// (will eventually be 0 if slash == std::string::npos)
|
|
|
9506 |
start = slash + 1,
|
|
|
9507 |
// find next slash
|
|
|
9508 |
slash = reference_string.find_first_of("/", start))
|
|
|
9509 |
{
|
|
|
9510 |
// use the text between the beginning of the reference token
|
|
|
9511 |
// (start) and the last slash (slash).
|
|
|
9512 |
auto reference_token = reference_string.substr(start, slash - start);
|
|
|
9513 |
|
|
|
9514 |
// check reference tokens are properly escaped
|
|
|
9515 |
for (size_t pos = reference_token.find_first_of("~");
|
|
|
9516 |
pos != std::string::npos;
|
|
|
9517 |
pos = reference_token.find_first_of("~", pos + 1))
|
|
|
9518 |
{
|
|
|
9519 |
assert(reference_token[pos] == '~');
|
|
|
9520 |
|
|
|
9521 |
// ~ must be followed by 0 or 1
|
|
|
9522 |
if (pos == reference_token.size() - 1 or
|
|
|
9523 |
(reference_token[pos + 1] != '0' and
|
|
|
9524 |
reference_token[pos + 1] != '1'))
|
|
|
9525 |
{
|
|
|
9526 |
throw std::domain_error("escape error: '~' must be followed with '0' or '1'");
|
|
|
9527 |
}
|
|
|
9528 |
}
|
|
|
9529 |
|
|
|
9530 |
// finally, store the reference token
|
|
|
9531 |
unescape(reference_token);
|
|
|
9532 |
result.push_back(reference_token);
|
|
|
9533 |
}
|
|
|
9534 |
|
|
|
9535 |
return result;
|
|
|
9536 |
}
|
|
|
9537 |
|
|
|
9538 |
private:
|
|
|
9539 |
/*!
|
|
|
9540 |
@brief replace all occurrences of a substring by another string
|
|
|
9541 |
|
|
|
9542 |
@param[in,out] s the string to manipulate
|
|
|
9543 |
@param[in] f the substring to replace with @a t
|
|
|
9544 |
@param[in] t the string to replace @a f
|
|
|
9545 |
|
|
|
9546 |
@return The string @a s where all occurrences of @a f are replaced
|
|
|
9547 |
with @a t.
|
|
|
9548 |
|
|
|
9549 |
@pre The search string @a f must not be empty.
|
|
|
9550 |
|
|
|
9551 |
@since version 2.0.0
|
|
|
9552 |
*/
|
|
|
9553 |
static void replace_substring(std::string& s,
|
|
|
9554 |
const std::string& f,
|
|
|
9555 |
const std::string& t)
|
|
|
9556 |
{
|
|
|
9557 |
assert(not f.empty());
|
|
|
9558 |
|
|
|
9559 |
for (
|
|
|
9560 |
size_t pos = s.find(f); // find first occurrence of f
|
|
|
9561 |
pos != std::string::npos; // make sure f was found
|
|
|
9562 |
s.replace(pos, f.size(), t), // replace with t
|
|
|
9563 |
pos = s.find(f, pos + t.size()) // find next occurrence of f
|
|
|
9564 |
);
|
|
|
9565 |
}
|
|
|
9566 |
|
|
|
9567 |
/// escape tilde and slash
|
|
|
9568 |
static std::string escape(std::string s)
|
|
|
9569 |
{
|
|
|
9570 |
// escape "~"" to "~0" and "/" to "~1"
|
|
|
9571 |
replace_substring(s, "~", "~0");
|
|
|
9572 |
replace_substring(s, "/", "~1");
|
|
|
9573 |
return s;
|
|
|
9574 |
}
|
|
|
9575 |
|
|
|
9576 |
/// unescape tilde and slash
|
|
|
9577 |
static void unescape(std::string& s)
|
|
|
9578 |
{
|
|
|
9579 |
// first transform any occurrence of the sequence '~1' to '/'
|
|
|
9580 |
replace_substring(s, "~1", "/");
|
|
|
9581 |
// then transform any occurrence of the sequence '~0' to '~'
|
|
|
9582 |
replace_substring(s, "~0", "~");
|
|
|
9583 |
}
|
|
|
9584 |
|
|
|
9585 |
/*!
|
|
|
9586 |
@param[in] reference_string the reference string to the current value
|
|
|
9587 |
@param[in] value the value to consider
|
|
|
9588 |
@param[in,out] result the result object to insert values to
|
|
|
9589 |
|
|
|
9590 |
@note Empty objects or arrays are flattened to `null`.
|
|
|
9591 |
*/
|
|
|
9592 |
static void flatten(const std::string& reference_string,
|
|
|
9593 |
const basic_json& value,
|
|
|
9594 |
basic_json& result)
|
|
|
9595 |
{
|
|
|
9596 |
switch (value.m_type)
|
|
|
9597 |
{
|
|
|
9598 |
case value_t::array:
|
|
|
9599 |
{
|
|
|
9600 |
if (value.m_value.array->empty())
|
|
|
9601 |
{
|
|
|
9602 |
// flatten empty array as null
|
|
|
9603 |
result[reference_string] = nullptr;
|
|
|
9604 |
}
|
|
|
9605 |
else
|
|
|
9606 |
{
|
|
|
9607 |
// iterate array and use index as reference string
|
|
|
9608 |
for (size_t i = 0; i < value.m_value.array->size(); ++i)
|
|
|
9609 |
{
|
|
|
9610 |
flatten(reference_string + "/" + std::to_string(i),
|
|
|
9611 |
value.m_value.array->operator[](i), result);
|
|
|
9612 |
}
|
|
|
9613 |
}
|
|
|
9614 |
break;
|
|
|
9615 |
}
|
|
|
9616 |
|
|
|
9617 |
case value_t::object:
|
|
|
9618 |
{
|
|
|
9619 |
if (value.m_value.object->empty())
|
|
|
9620 |
{
|
|
|
9621 |
// flatten empty object as null
|
|
|
9622 |
result[reference_string] = nullptr;
|
|
|
9623 |
}
|
|
|
9624 |
else
|
|
|
9625 |
{
|
|
|
9626 |
// iterate object and use keys as reference string
|
|
|
9627 |
for (const auto& element : *value.m_value.object)
|
|
|
9628 |
{
|
|
|
9629 |
flatten(reference_string + "/" + escape(element.first),
|
|
|
9630 |
element.second, result);
|
|
|
9631 |
}
|
|
|
9632 |
}
|
|
|
9633 |
break;
|
|
|
9634 |
}
|
|
|
9635 |
|
|
|
9636 |
default:
|
|
|
9637 |
{
|
|
|
9638 |
// add primitive value with its reference string
|
|
|
9639 |
result[reference_string] = value;
|
|
|
9640 |
break;
|
|
|
9641 |
}
|
|
|
9642 |
}
|
|
|
9643 |
}
|
|
|
9644 |
|
|
|
9645 |
/*!
|
|
|
9646 |
@param[in] value flattened JSON
|
|
|
9647 |
|
|
|
9648 |
@return unflattened JSON
|
|
|
9649 |
*/
|
|
|
9650 |
static basic_json unflatten(const basic_json& value)
|
|
|
9651 |
{
|
|
|
9652 |
if (not value.is_object())
|
|
|
9653 |
{
|
|
|
9654 |
throw std::domain_error("only objects can be unflattened");
|
|
|
9655 |
}
|
|
|
9656 |
|
|
|
9657 |
basic_json result;
|
|
|
9658 |
|
|
|
9659 |
// iterate the JSON object values
|
|
|
9660 |
for (const auto& element : *value.m_value.object)
|
|
|
9661 |
{
|
|
|
9662 |
if (not element.second.is_primitive())
|
|
|
9663 |
{
|
|
|
9664 |
throw std::domain_error("values in object must be primitive");
|
|
|
9665 |
}
|
|
|
9666 |
|
|
|
9667 |
// assign value to reference pointed to by JSON pointer; Note
|
|
|
9668 |
// that if the JSON pointer is "" (i.e., points to the whole
|
|
|
9669 |
// value), function get_and_create returns a reference to
|
|
|
9670 |
// result itself. An assignment will then create a primitive
|
|
|
9671 |
// value.
|
|
|
9672 |
json_pointer(element.first).get_and_create(result) = element.second;
|
|
|
9673 |
}
|
|
|
9674 |
|
|
|
9675 |
return result;
|
|
|
9676 |
}
|
|
|
9677 |
|
|
|
9678 |
private:
|
|
|
9679 |
/// the reference tokens
|
|
|
9680 |
std::vector<std::string> reference_tokens {};
|
|
|
9681 |
};
|
|
|
9682 |
|
|
|
9683 |
//////////////////////////
|
|
|
9684 |
// JSON Pointer support //
|
|
|
9685 |
//////////////////////////
|
|
|
9686 |
|
|
|
9687 |
/// @name JSON Pointer functions
|
|
|
9688 |
/// @{
|
|
|
9689 |
|
|
|
9690 |
/*!
|
|
|
9691 |
@brief access specified element via JSON Pointer
|
|
|
9692 |
|
|
|
9693 |
Uses a JSON pointer to retrieve a reference to the respective JSON value.
|
|
|
9694 |
No bound checking is performed. Similar to @ref operator[](const typename
|
|
|
9695 |
object_t::key_type&), `null` values are created in arrays and objects if
|
|
|
9696 |
necessary.
|
|
|
9697 |
|
|
|
9698 |
In particular:
|
|
|
9699 |
- If the JSON pointer points to an object key that does not exist, it
|
|
|
9700 |
is created an filled with a `null` value before a reference to it
|
|
|
9701 |
is returned.
|
|
|
9702 |
- If the JSON pointer points to an array index that does not exist, it
|
|
|
9703 |
is created an filled with a `null` value before a reference to it
|
|
|
9704 |
is returned. All indices between the current maximum and the given
|
|
|
9705 |
index are also filled with `null`.
|
|
|
9706 |
- The special value `-` is treated as a synonym for the index past the
|
|
|
9707 |
end.
|
|
|
9708 |
|
|
|
9709 |
@param[in] ptr a JSON pointer
|
|
|
9710 |
|
|
|
9711 |
@return reference to the element pointed to by @a ptr
|
|
|
9712 |
|
|
|
9713 |
@complexity Constant.
|
|
|
9714 |
|
|
|
9715 |
@throw std::out_of_range if the JSON pointer can not be resolved
|
|
|
9716 |
@throw std::domain_error if an array index begins with '0'
|
|
|
9717 |
@throw std::invalid_argument if an array index was not a number
|
|
|
9718 |
|
|
|
9719 |
@liveexample{The behavior is shown in the example.,operatorjson_pointer}
|
|
|
9720 |
|
|
|
9721 |
@since version 2.0.0
|
|
|
9722 |
*/
|
|
|
9723 |
reference operator[](const json_pointer& ptr)
|
|
|
9724 |
{
|
|
|
9725 |
return ptr.get_unchecked(this);
|
|
|
9726 |
}
|
|
|
9727 |
|
|
|
9728 |
/*!
|
|
|
9729 |
@brief access specified element via JSON Pointer
|
|
|
9730 |
|
|
|
9731 |
Uses a JSON pointer to retrieve a reference to the respective JSON value.
|
|
|
9732 |
No bound checking is performed. The function does not change the JSON
|
|
|
9733 |
value; no `null` values are created. In particular, the the special value
|
|
|
9734 |
`-` yields an exception.
|
|
|
9735 |
|
|
|
9736 |
@param[in] ptr JSON pointer to the desired element
|
|
|
9737 |
|
|
|
9738 |
@return const reference to the element pointed to by @a ptr
|
|
|
9739 |
|
|
|
9740 |
@complexity Constant.
|
|
|
9741 |
|
|
|
9742 |
@throw std::out_of_range if the JSON pointer can not be resolved
|
|
|
9743 |
@throw std::domain_error if an array index begins with '0'
|
|
|
9744 |
@throw std::invalid_argument if an array index was not a number
|
|
|
9745 |
|
|
|
9746 |
@liveexample{The behavior is shown in the example.,operatorjson_pointer_const}
|
|
|
9747 |
|
|
|
9748 |
@since version 2.0.0
|
|
|
9749 |
*/
|
|
|
9750 |
const_reference operator[](const json_pointer& ptr) const
|
|
|
9751 |
{
|
|
|
9752 |
return ptr.get_unchecked(this);
|
|
|
9753 |
}
|
|
|
9754 |
|
|
|
9755 |
/*!
|
|
|
9756 |
@brief access specified element via JSON Pointer
|
|
|
9757 |
|
|
|
9758 |
Returns a reference to the element at with specified JSON pointer @a ptr,
|
|
|
9759 |
with bounds checking.
|
|
|
9760 |
|
|
|
9761 |
@param[in] ptr JSON pointer to the desired element
|
|
|
9762 |
|
|
|
9763 |
@return reference to the element pointed to by @a ptr
|
|
|
9764 |
|
|
|
9765 |
@complexity Constant.
|
|
|
9766 |
|
|
|
9767 |
@throw std::out_of_range if the JSON pointer can not be resolved
|
|
|
9768 |
@throw std::domain_error if an array index begins with '0'
|
|
|
9769 |
@throw std::invalid_argument if an array index was not a number
|
|
|
9770 |
|
|
|
9771 |
@liveexample{The behavior is shown in the example.,at_json_pointer}
|
|
|
9772 |
|
|
|
9773 |
@since version 2.0.0
|
|
|
9774 |
*/
|
|
|
9775 |
reference at(const json_pointer& ptr)
|
|
|
9776 |
{
|
|
|
9777 |
return ptr.get_checked(this);
|
|
|
9778 |
}
|
|
|
9779 |
|
|
|
9780 |
/*!
|
|
|
9781 |
@brief access specified element via JSON Pointer
|
|
|
9782 |
|
|
|
9783 |
Returns a const reference to the element at with specified JSON pointer @a
|
|
|
9784 |
ptr, with bounds checking.
|
|
|
9785 |
|
|
|
9786 |
@param[in] ptr JSON pointer to the desired element
|
|
|
9787 |
|
|
|
9788 |
@return reference to the element pointed to by @a ptr
|
|
|
9789 |
|
|
|
9790 |
@complexity Constant.
|
|
|
9791 |
|
|
|
9792 |
@throw std::out_of_range if the JSON pointer can not be resolved
|
|
|
9793 |
@throw std::domain_error if an array index begins with '0'
|
|
|
9794 |
@throw std::invalid_argument if an array index was not a number
|
|
|
9795 |
|
|
|
9796 |
@liveexample{The behavior is shown in the example.,at_json_pointer_const}
|
|
|
9797 |
|
|
|
9798 |
@since version 2.0.0
|
|
|
9799 |
*/
|
|
|
9800 |
const_reference at(const json_pointer& ptr) const
|
|
|
9801 |
{
|
|
|
9802 |
return ptr.get_checked(this);
|
|
|
9803 |
}
|
|
|
9804 |
|
|
|
9805 |
/*!
|
|
|
9806 |
@brief return flattened JSON value
|
|
|
9807 |
|
|
|
9808 |
The function creates a JSON object whose keys are JSON pointers (see [RFC
|
|
|
9809 |
6901](https://tools.ietf.org/html/rfc6901)) and whose values are all
|
|
|
9810 |
primitive. The original JSON value can be restored using the @ref
|
|
|
9811 |
unflatten() function.
|
|
|
9812 |
|
|
|
9813 |
@return an object that maps JSON pointers to primitve values
|
|
|
9814 |
|
|
|
9815 |
@note Empty objects and arrays are flattened to `null` and will not be
|
|
|
9816 |
reconstructed correctly by the @ref unflatten() function.
|
|
|
9817 |
|
|
|
9818 |
@complexity Linear in the size the JSON value.
|
|
|
9819 |
|
|
|
9820 |
@liveexample{The following code shows how a JSON object is flattened to an
|
|
|
9821 |
object whose keys consist of JSON pointers.,flatten}
|
|
|
9822 |
|
|
|
9823 |
@sa @ref unflatten() for the reverse function
|
|
|
9824 |
|
|
|
9825 |
@since version 2.0.0
|
|
|
9826 |
*/
|
|
|
9827 |
basic_json flatten() const
|
|
|
9828 |
{
|
|
|
9829 |
basic_json result(value_t::object);
|
|
|
9830 |
json_pointer::flatten("", *this, result);
|
|
|
9831 |
return result;
|
|
|
9832 |
}
|
|
|
9833 |
|
|
|
9834 |
/*!
|
|
|
9835 |
@brief unflatten a previously flattened JSON value
|
|
|
9836 |
|
|
|
9837 |
The function restores the arbitrary nesting of a JSON value that has been
|
|
|
9838 |
flattened before using the @ref flatten() function. The JSON value must
|
|
|
9839 |
meet certain constraints:
|
|
|
9840 |
1. The value must be an object.
|
|
|
9841 |
2. The keys must be JSON pointers (see
|
|
|
9842 |
[RFC 6901](https://tools.ietf.org/html/rfc6901))
|
|
|
9843 |
3. The mapped values must be primitive JSON types.
|
|
|
9844 |
|
|
|
9845 |
@return the original JSON from a flattened version
|
|
|
9846 |
|
|
|
9847 |
@note Empty objects and arrays are flattened by @ref flatten() to `null`
|
|
|
9848 |
values and can not unflattened to their original type. Apart from
|
|
|
9849 |
this example, for a JSON value `j`, the following is always true:
|
|
|
9850 |
`j == j.flatten().unflatten()`.
|
|
|
9851 |
|
|
|
9852 |
@complexity Linear in the size the JSON value.
|
|
|
9853 |
|
|
|
9854 |
@liveexample{The following code shows how a flattened JSON object is
|
|
|
9855 |
unflattened into the original nested JSON object.,unflatten}
|
|
|
9856 |
|
|
|
9857 |
@sa @ref flatten() for the reverse function
|
|
|
9858 |
|
|
|
9859 |
@since version 2.0.0
|
|
|
9860 |
*/
|
|
|
9861 |
basic_json unflatten() const
|
|
|
9862 |
{
|
|
|
9863 |
return json_pointer::unflatten(*this);
|
|
|
9864 |
}
|
|
|
9865 |
|
|
|
9866 |
/// @}
|
|
|
9867 |
|
|
|
9868 |
//////////////////////////
|
|
|
9869 |
// JSON Patch functions //
|
|
|
9870 |
//////////////////////////
|
|
|
9871 |
|
|
|
9872 |
/// @name JSON Patch functions
|
|
|
9873 |
/// @{
|
|
|
9874 |
|
|
|
9875 |
/*!
|
|
|
9876 |
@brief applies a JSON patch
|
|
|
9877 |
|
|
|
9878 |
[JSON Patch](http://jsonpatch.com) defines a JSON document structure for
|
|
|
9879 |
expressing a sequence of operations to apply to a JSON) document. With
|
|
|
9880 |
this funcion, a JSON Patch is applied to the current JSON value by
|
|
|
9881 |
executing all operations from the patch.
|
|
|
9882 |
|
|
|
9883 |
@param[in] json_patch JSON patch document
|
|
|
9884 |
@return patched document
|
|
|
9885 |
|
|
|
9886 |
@note The application of a patch is atomic: Either all operations succeed
|
|
|
9887 |
and the patched document is returned or an exception is thrown. In
|
|
|
9888 |
any case, the original value is not changed: the patch is applied
|
|
|
9889 |
to a copy of the value.
|
|
|
9890 |
|
|
|
9891 |
@throw std::out_of_range if a JSON pointer inside the patch could not
|
|
|
9892 |
be resolved successfully in the current JSON value; example: `"key baz
|
|
|
9893 |
not found"`
|
|
|
9894 |
@throw invalid_argument if the JSON patch is malformed (e.g., mandatory
|
|
|
9895 |
attributes are missing); example: `"operation add must have member path"`
|
|
|
9896 |
|
|
|
9897 |
@complexity Linear in the size of the JSON value and the length of the
|
|
|
9898 |
JSON patch. As usually only a fraction of the JSON value is affected by
|
|
|
9899 |
the patch, the complexity can usually be neglected.
|
|
|
9900 |
|
|
|
9901 |
@liveexample{The following code shows how a JSON patch is applied to a
|
|
|
9902 |
value.,patch}
|
|
|
9903 |
|
|
|
9904 |
@sa @ref diff -- create a JSON patch by comparing two JSON values
|
|
|
9905 |
|
|
|
9906 |
@sa [RFC 6902 (JSON Patch)](https://tools.ietf.org/html/rfc6902)
|
|
|
9907 |
@sa [RFC 6901 (JSON Pointer)](https://tools.ietf.org/html/rfc6901)
|
|
|
9908 |
|
|
|
9909 |
@since version 2.0.0
|
|
|
9910 |
*/
|
|
|
9911 |
basic_json patch(const basic_json& json_patch) const
|
|
|
9912 |
{
|
|
|
9913 |
// make a working copy to apply the patch to
|
|
|
9914 |
basic_json result = *this;
|
|
|
9915 |
|
|
|
9916 |
// the valid JSON Patch operations
|
|
|
9917 |
enum class patch_operations {add, remove, replace, move, copy, test, invalid};
|
|
|
9918 |
|
|
|
9919 |
const auto get_op = [](const std::string op)
|
|
|
9920 |
{
|
|
|
9921 |
if (op == "add")
|
|
|
9922 |
{
|
|
|
9923 |
return patch_operations::add;
|
|
|
9924 |
}
|
|
|
9925 |
if (op == "remove")
|
|
|
9926 |
{
|
|
|
9927 |
return patch_operations::remove;
|
|
|
9928 |
}
|
|
|
9929 |
if (op == "replace")
|
|
|
9930 |
{
|
|
|
9931 |
return patch_operations::replace;
|
|
|
9932 |
}
|
|
|
9933 |
if (op == "move")
|
|
|
9934 |
{
|
|
|
9935 |
return patch_operations::move;
|
|
|
9936 |
}
|
|
|
9937 |
if (op == "copy")
|
|
|
9938 |
{
|
|
|
9939 |
return patch_operations::copy;
|
|
|
9940 |
}
|
|
|
9941 |
if (op == "test")
|
|
|
9942 |
{
|
|
|
9943 |
return patch_operations::test;
|
|
|
9944 |
}
|
|
|
9945 |
|
|
|
9946 |
return patch_operations::invalid;
|
|
|
9947 |
};
|
|
|
9948 |
|
|
|
9949 |
// wrapper for "add" operation; add value at ptr
|
|
|
9950 |
const auto operation_add = [&result](json_pointer & ptr, basic_json val)
|
|
|
9951 |
{
|
|
|
9952 |
// adding to the root of the target document means replacing it
|
|
|
9953 |
if (ptr.is_root())
|
|
|
9954 |
{
|
|
|
9955 |
result = val;
|
|
|
9956 |
}
|
|
|
9957 |
else
|
|
|
9958 |
{
|
|
|
9959 |
// make sure the top element of the pointer exists
|
|
|
9960 |
json_pointer top_pointer = ptr.top();
|
|
|
9961 |
if (top_pointer != ptr)
|
|
|
9962 |
{
|
|
|
9963 |
basic_json& x = result.at(top_pointer);
|
|
|
9964 |
}
|
|
|
9965 |
|
|
|
9966 |
// get reference to parent of JSON pointer ptr
|
|
|
9967 |
const auto last_path = ptr.pop_back();
|
|
|
9968 |
basic_json& parent = result[ptr];
|
|
|
9969 |
|
|
|
9970 |
switch (parent.m_type)
|
|
|
9971 |
{
|
|
|
9972 |
case value_t::null:
|
|
|
9973 |
case value_t::object:
|
|
|
9974 |
{
|
|
|
9975 |
// use operator[] to add value
|
|
|
9976 |
parent[last_path] = val;
|
|
|
9977 |
break;
|
|
|
9978 |
}
|
|
|
9979 |
|
|
|
9980 |
case value_t::array:
|
|
|
9981 |
{
|
|
|
9982 |
if (last_path == "-")
|
|
|
9983 |
{
|
|
|
9984 |
// special case: append to back
|
|
|
9985 |
parent.push_back(val);
|
|
|
9986 |
}
|
|
|
9987 |
else
|
|
|
9988 |
{
|
|
|
9989 |
const auto idx = std::stoi(last_path);
|
|
|
9990 |
if (static_cast<size_type>(idx) > parent.size())
|
|
|
9991 |
{
|
|
|
9992 |
// avoid undefined behavior
|
|
|
9993 |
throw std::out_of_range("array index " + std::to_string(idx) + " is out of range");
|
|
|
9994 |
}
|
|
|
9995 |
else
|
|
|
9996 |
{
|
|
|
9997 |
// default case: insert add offset
|
|
|
9998 |
parent.insert(parent.begin() + static_cast<difference_type>(idx), val);
|
|
|
9999 |
}
|
|
|
10000 |
}
|
|
|
10001 |
break;
|
|
|
10002 |
}
|
|
|
10003 |
|
|
|
10004 |
default:
|
|
|
10005 |
{
|
|
|
10006 |
// if there exists a parent it cannot be primitive
|
|
|
10007 |
assert(false); // LCOV_EXCL_LINE
|
|
|
10008 |
}
|
|
|
10009 |
}
|
|
|
10010 |
}
|
|
|
10011 |
};
|
|
|
10012 |
|
|
|
10013 |
// wrapper for "remove" operation; remove value at ptr
|
|
|
10014 |
const auto operation_remove = [&result](json_pointer & ptr)
|
|
|
10015 |
{
|
|
|
10016 |
// get reference to parent of JSON pointer ptr
|
|
|
10017 |
const auto last_path = ptr.pop_back();
|
|
|
10018 |
basic_json& parent = result.at(ptr);
|
|
|
10019 |
|
|
|
10020 |
// remove child
|
|
|
10021 |
if (parent.is_object())
|
|
|
10022 |
{
|
|
|
10023 |
// perform range check
|
|
|
10024 |
auto it = parent.find(last_path);
|
|
|
10025 |
if (it != parent.end())
|
|
|
10026 |
{
|
|
|
10027 |
parent.erase(it);
|
|
|
10028 |
}
|
|
|
10029 |
else
|
|
|
10030 |
{
|
|
|
10031 |
throw std::out_of_range("key '" + last_path + "' not found");
|
|
|
10032 |
}
|
|
|
10033 |
}
|
|
|
10034 |
else if (parent.is_array())
|
|
|
10035 |
{
|
|
|
10036 |
// note erase performs range check
|
|
|
10037 |
parent.erase(static_cast<size_type>(std::stoi(last_path)));
|
|
|
10038 |
}
|
|
|
10039 |
};
|
|
|
10040 |
|
|
|
10041 |
// type check
|
|
|
10042 |
if (not json_patch.is_array())
|
|
|
10043 |
{
|
|
|
10044 |
// a JSON patch must be an array of objects
|
|
|
10045 |
throw std::invalid_argument("JSON patch must be an array of objects");
|
|
|
10046 |
}
|
|
|
10047 |
|
|
|
10048 |
// iterate and apply th eoperations
|
|
|
10049 |
for (const auto& val : json_patch)
|
|
|
10050 |
{
|
|
|
10051 |
// wrapper to get a value for an operation
|
|
|
10052 |
const auto get_value = [&val](const std::string & op,
|
|
|
10053 |
const std::string & member,
|
|
|
10054 |
bool string_type) -> basic_json&
|
|
|
10055 |
{
|
|
|
10056 |
// find value
|
|
|
10057 |
auto it = val.m_value.object->find(member);
|
|
|
10058 |
|
|
|
10059 |
// context-sensitive error message
|
|
|
10060 |
const auto error_msg = (op == "op") ? "operation" : "operation '" + op + "'";
|
|
|
10061 |
|
|
|
10062 |
// check if desired value is present
|
|
|
10063 |
if (it == val.m_value.object->end())
|
|
|
10064 |
{
|
|
|
10065 |
throw std::invalid_argument(error_msg + " must have member '" + member + "'");
|
|
|
10066 |
}
|
|
|
10067 |
|
|
|
10068 |
// check if result is of type string
|
|
|
10069 |
if (string_type and not it->second.is_string())
|
|
|
10070 |
{
|
|
|
10071 |
throw std::invalid_argument(error_msg + " must have string member '" + member + "'");
|
|
|
10072 |
}
|
|
|
10073 |
|
|
|
10074 |
// no error: return value
|
|
|
10075 |
return it->second;
|
|
|
10076 |
};
|
|
|
10077 |
|
|
|
10078 |
// type check
|
|
|
10079 |
if (not val.is_object())
|
|
|
10080 |
{
|
|
|
10081 |
throw std::invalid_argument("JSON patch must be an array of objects");
|
|
|
10082 |
}
|
|
|
10083 |
|
|
|
10084 |
// collect mandatory members
|
|
|
10085 |
const std::string op = get_value("op", "op", true);
|
|
|
10086 |
const std::string path = get_value(op, "path", true);
|
|
|
10087 |
json_pointer ptr(path);
|
|
|
10088 |
|
|
|
10089 |
switch (get_op(op))
|
|
|
10090 |
{
|
|
|
10091 |
case patch_operations::add:
|
|
|
10092 |
{
|
|
|
10093 |
operation_add(ptr, get_value("add", "value", false));
|
|
|
10094 |
break;
|
|
|
10095 |
}
|
|
|
10096 |
|
|
|
10097 |
case patch_operations::remove:
|
|
|
10098 |
{
|
|
|
10099 |
operation_remove(ptr);
|
|
|
10100 |
break;
|
|
|
10101 |
}
|
|
|
10102 |
|
|
|
10103 |
case patch_operations::replace:
|
|
|
10104 |
{
|
|
|
10105 |
// the "path" location must exist - use at()
|
|
|
10106 |
result.at(ptr) = get_value("replace", "value", false);
|
|
|
10107 |
break;
|
|
|
10108 |
}
|
|
|
10109 |
|
|
|
10110 |
case patch_operations::move:
|
|
|
10111 |
{
|
|
|
10112 |
const std::string from_path = get_value("move", "from", true);
|
|
|
10113 |
json_pointer from_ptr(from_path);
|
|
|
10114 |
|
|
|
10115 |
// the "from" location must exist - use at()
|
|
|
10116 |
basic_json v = result.at(from_ptr);
|
|
|
10117 |
|
|
|
10118 |
// The move operation is functionally identical to a
|
|
|
10119 |
// "remove" operation on the "from" location, followed
|
|
|
10120 |
// immediately by an "add" operation at the target
|
|
|
10121 |
// location with the value that was just removed.
|
|
|
10122 |
operation_remove(from_ptr);
|
|
|
10123 |
operation_add(ptr, v);
|
|
|
10124 |
break;
|
|
|
10125 |
}
|
|
|
10126 |
|
|
|
10127 |
case patch_operations::copy:
|
|
|
10128 |
{
|
|
|
10129 |
const std::string from_path = get_value("copy", "from", true);;
|
|
|
10130 |
const json_pointer from_ptr(from_path);
|
|
|
10131 |
|
|
|
10132 |
// the "from" location must exist - use at()
|
|
|
10133 |
result[ptr] = result.at(from_ptr);
|
|
|
10134 |
break;
|
|
|
10135 |
}
|
|
|
10136 |
|
|
|
10137 |
case patch_operations::test:
|
|
|
10138 |
{
|
|
|
10139 |
bool success = false;
|
|
|
10140 |
try
|
|
|
10141 |
{
|
|
|
10142 |
// check if "value" matches the one at "path"
|
|
|
10143 |
// the "path" location must exist - use at()
|
|
|
10144 |
success = (result.at(ptr) == get_value("test", "value", false));
|
|
|
10145 |
}
|
|
|
10146 |
catch (std::out_of_range&)
|
|
|
10147 |
{
|
|
|
10148 |
// ignore out of range errors: success remains false
|
|
|
10149 |
}
|
|
|
10150 |
|
|
|
10151 |
// throw an exception if test fails
|
|
|
10152 |
if (not success)
|
|
|
10153 |
{
|
|
|
10154 |
throw std::domain_error("unsuccessful: " + val.dump());
|
|
|
10155 |
}
|
|
|
10156 |
|
|
|
10157 |
break;
|
|
|
10158 |
}
|
|
|
10159 |
|
|
|
10160 |
case patch_operations::invalid:
|
|
|
10161 |
{
|
|
|
10162 |
// op must be "add", "remove", "replace", "move", "copy", or
|
|
|
10163 |
// "test"
|
|
|
10164 |
throw std::invalid_argument("operation value '" + op + "' is invalid");
|
|
|
10165 |
}
|
|
|
10166 |
}
|
|
|
10167 |
}
|
|
|
10168 |
|
|
|
10169 |
return result;
|
|
|
10170 |
}
|
|
|
10171 |
|
|
|
10172 |
/*!
|
|
|
10173 |
@brief creates a diff as a JSON patch
|
|
|
10174 |
|
|
|
10175 |
Creates a [JSON Patch](http://jsonpatch.com) so that value @a source can
|
|
|
10176 |
be changed into the value @a target by calling @ref patch function.
|
|
|
10177 |
|
|
|
10178 |
@invariant For two JSON values @a source and @a target, the following code
|
|
|
10179 |
yields always `true`:
|
|
|
10180 |
@code {.cpp}
|
|
|
10181 |
source.patch(diff(source, target)) == target;
|
|
|
10182 |
@endcode
|
|
|
10183 |
|
|
|
10184 |
@note Currently, only `remove`, `add`, and `replace` operations are
|
|
|
10185 |
generated.
|
|
|
10186 |
|
|
|
10187 |
@param[in] source JSON value to copare from
|
|
|
10188 |
@param[in] target JSON value to copare against
|
|
|
10189 |
@param[in] path helper value to create JSON pointers
|
|
|
10190 |
|
|
|
10191 |
@return a JSON patch to convert the @a source to @a target
|
|
|
10192 |
|
|
|
10193 |
@complexity Linear in the lengths of @a source and @a target.
|
|
|
10194 |
|
|
|
10195 |
@liveexample{The following code shows how a JSON patch is created as a
|
|
|
10196 |
diff for two JSON values.,diff}
|
|
|
10197 |
|
|
|
10198 |
@sa @ref patch -- apply a JSON patch
|
|
|
10199 |
|
|
|
10200 |
@sa [RFC 6902 (JSON Patch)](https://tools.ietf.org/html/rfc6902)
|
|
|
10201 |
|
|
|
10202 |
@since version 2.0.0
|
|
|
10203 |
*/
|
|
|
10204 |
static basic_json diff(const basic_json& source,
|
|
|
10205 |
const basic_json& target,
|
|
|
10206 |
std::string path = "")
|
|
|
10207 |
{
|
|
|
10208 |
// the patch
|
|
|
10209 |
basic_json result(value_t::array);
|
|
|
10210 |
|
|
|
10211 |
// if the values are the same, return empty patch
|
|
|
10212 |
if (source == target)
|
|
|
10213 |
{
|
|
|
10214 |
return result;
|
|
|
10215 |
}
|
|
|
10216 |
|
|
|
10217 |
if (source.type() != target.type())
|
|
|
10218 |
{
|
|
|
10219 |
// different types: replace value
|
|
|
10220 |
result.push_back(
|
|
|
10221 |
{
|
|
|
10222 |
{"op", "replace"},
|
|
|
10223 |
{"path", path},
|
|
|
10224 |
{"value", target}
|
|
|
10225 |
});
|
|
|
10226 |
}
|
|
|
10227 |
else
|
|
|
10228 |
{
|
|
|
10229 |
switch (source.type())
|
|
|
10230 |
{
|
|
|
10231 |
case value_t::array:
|
|
|
10232 |
{
|
|
|
10233 |
// first pass: traverse common elements
|
|
|
10234 |
size_t i = 0;
|
|
|
10235 |
while (i < source.size() and i < target.size())
|
|
|
10236 |
{
|
|
|
10237 |
// recursive call to compare array values at index i
|
|
|
10238 |
auto temp_diff = diff(source[i], target[i], path + "/" + std::to_string(i));
|
|
|
10239 |
result.insert(result.end(), temp_diff.begin(), temp_diff.end());
|
|
|
10240 |
++i;
|
|
|
10241 |
}
|
|
|
10242 |
|
|
|
10243 |
// i now reached the end of at least one array
|
|
|
10244 |
// in a second pass, traverse the remaining elements
|
|
|
10245 |
|
|
|
10246 |
// remove my remaining elements
|
|
|
10247 |
const auto end_index = static_cast<difference_type>(result.size());
|
|
|
10248 |
while (i < source.size())
|
|
|
10249 |
{
|
|
|
10250 |
// add operations in reverse order to avoid invalid
|
|
|
10251 |
// indices
|
|
|
10252 |
result.insert(result.begin() + end_index, object(
|
|
|
10253 |
{
|
|
|
10254 |
{"op", "remove"},
|
|
|
10255 |
{"path", path + "/" + std::to_string(i)}
|
|
|
10256 |
}));
|
|
|
10257 |
++i;
|
|
|
10258 |
}
|
|
|
10259 |
|
|
|
10260 |
// add other remaining elements
|
|
|
10261 |
while (i < target.size())
|
|
|
10262 |
{
|
|
|
10263 |
result.push_back(
|
|
|
10264 |
{
|
|
|
10265 |
{"op", "add"},
|
|
|
10266 |
{"path", path + "/" + std::to_string(i)},
|
|
|
10267 |
{"value", target[i]}
|
|
|
10268 |
});
|
|
|
10269 |
++i;
|
|
|
10270 |
}
|
|
|
10271 |
|
|
|
10272 |
break;
|
|
|
10273 |
}
|
|
|
10274 |
|
|
|
10275 |
case value_t::object:
|
|
|
10276 |
{
|
|
|
10277 |
// first pass: traverse this object's elements
|
|
|
10278 |
for (auto it = source.begin(); it != source.end(); ++it)
|
|
|
10279 |
{
|
|
|
10280 |
// escape the key name to be used in a JSON patch
|
|
|
10281 |
const auto key = json_pointer::escape(it.key());
|
|
|
10282 |
|
|
|
10283 |
if (target.find(it.key()) != target.end())
|
|
|
10284 |
{
|
|
|
10285 |
// recursive call to compare object values at key it
|
|
|
10286 |
auto temp_diff = diff(it.value(), target[it.key()], path + "/" + key);
|
|
|
10287 |
result.insert(result.end(), temp_diff.begin(), temp_diff.end());
|
|
|
10288 |
}
|
|
|
10289 |
else
|
|
|
10290 |
{
|
|
|
10291 |
// found a key that is not in o -> remove it
|
|
|
10292 |
result.push_back(object(
|
|
|
10293 |
{
|
|
|
10294 |
{"op", "remove"},
|
|
|
10295 |
{"path", path + "/" + key}
|
|
|
10296 |
}));
|
|
|
10297 |
}
|
|
|
10298 |
}
|
|
|
10299 |
|
|
|
10300 |
// second pass: traverse other object's elements
|
|
|
10301 |
for (auto it = target.begin(); it != target.end(); ++it)
|
|
|
10302 |
{
|
|
|
10303 |
if (source.find(it.key()) == source.end())
|
|
|
10304 |
{
|
|
|
10305 |
// found a key that is not in this -> add it
|
|
|
10306 |
const auto key = json_pointer::escape(it.key());
|
|
|
10307 |
result.push_back(
|
|
|
10308 |
{
|
|
|
10309 |
{"op", "add"},
|
|
|
10310 |
{"path", path + "/" + key},
|
|
|
10311 |
{"value", it.value()}
|
|
|
10312 |
});
|
|
|
10313 |
}
|
|
|
10314 |
}
|
|
|
10315 |
|
|
|
10316 |
break;
|
|
|
10317 |
}
|
|
|
10318 |
|
|
|
10319 |
default:
|
|
|
10320 |
{
|
|
|
10321 |
// both primitive type: replace value
|
|
|
10322 |
result.push_back(
|
|
|
10323 |
{
|
|
|
10324 |
{"op", "replace"},
|
|
|
10325 |
{"path", path},
|
|
|
10326 |
{"value", target}
|
|
|
10327 |
});
|
|
|
10328 |
break;
|
|
|
10329 |
}
|
|
|
10330 |
}
|
|
|
10331 |
}
|
|
|
10332 |
|
|
|
10333 |
return result;
|
|
|
10334 |
}
|
|
|
10335 |
|
|
|
10336 |
/// @}
|
|
|
10337 |
};
|
|
|
10338 |
|
|
|
10339 |
|
|
|
10340 |
/////////////
|
|
|
10341 |
// presets //
|
|
|
10342 |
/////////////
|
|
|
10343 |
|
|
|
10344 |
/*!
|
|
|
10345 |
@brief default JSON class
|
|
|
10346 |
|
|
|
10347 |
This type is the default specialization of the @ref basic_json class which
|
|
|
10348 |
uses the standard template types.
|
|
|
10349 |
|
|
|
10350 |
@since version 1.0.0
|
|
|
10351 |
*/
|
|
|
10352 |
using json = basic_json<>;
|
|
|
10353 |
}
|
|
|
10354 |
|
|
|
10355 |
|
|
|
10356 |
///////////////////////
|
|
|
10357 |
// nonmember support //
|
|
|
10358 |
///////////////////////
|
|
|
10359 |
|
|
|
10360 |
// specialization of std::swap, and std::hash
|
|
|
10361 |
namespace std
|
|
|
10362 |
{
|
|
|
10363 |
/*!
|
|
|
10364 |
@brief exchanges the values of two JSON objects
|
|
|
10365 |
|
|
|
10366 |
@since version 1.0.0
|
|
|
10367 |
*/
|
|
|
10368 |
template <>
|
|
|
10369 |
inline void swap(nlohmann::json& j1,
|
|
|
10370 |
nlohmann::json& j2) noexcept(
|
|
|
10371 |
is_nothrow_move_constructible<nlohmann::json>::value and
|
|
|
10372 |
is_nothrow_move_assignable<nlohmann::json>::value
|
|
|
10373 |
)
|
|
|
10374 |
{
|
|
|
10375 |
j1.swap(j2);
|
|
|
10376 |
}
|
|
|
10377 |
|
|
|
10378 |
/// hash value for JSON objects
|
|
|
10379 |
template <>
|
|
|
10380 |
struct hash<nlohmann::json>
|
|
|
10381 |
{
|
|
|
10382 |
/*!
|
|
|
10383 |
@brief return a hash value for a JSON object
|
|
|
10384 |
|
|
|
10385 |
@since version 1.0.0
|
|
|
10386 |
*/
|
|
|
10387 |
std::size_t operator()(const nlohmann::json& j) const
|
|
|
10388 |
{
|
|
|
10389 |
// a naive hashing via the string representation
|
|
|
10390 |
const auto& h = hash<nlohmann::json::string_t>();
|
|
|
10391 |
return h(j.dump());
|
|
|
10392 |
}
|
|
|
10393 |
};
|
|
|
10394 |
}
|
|
|
10395 |
|
|
|
10396 |
/*!
|
|
|
10397 |
@brief user-defined string literal for JSON values
|
|
|
10398 |
|
|
|
10399 |
This operator implements a user-defined string literal for JSON objects. It
|
|
|
10400 |
can be used by adding `"_json"` to a string literal and returns a JSON object
|
|
|
10401 |
if no parse error occurred.
|
|
|
10402 |
|
|
|
10403 |
@param[in] s a string representation of a JSON object
|
|
|
10404 |
@return a JSON object
|
|
|
10405 |
|
|
|
10406 |
@since version 1.0.0
|
|
|
10407 |
*/
|
|
|
10408 |
inline nlohmann::json operator "" _json(const char* s, std::size_t)
|
|
|
10409 |
{
|
|
|
10410 |
return nlohmann::json::parse(reinterpret_cast<const nlohmann::json::string_t::value_type*>(s));
|
|
|
10411 |
}
|
|
|
10412 |
|
|
|
10413 |
/*!
|
|
|
10414 |
@brief user-defined string literal for JSON pointer
|
|
|
10415 |
|
|
|
10416 |
This operator implements a user-defined string literal for JSON Pointers. It
|
|
|
10417 |
can be used by adding `"_json"` to a string literal and returns a JSON pointer
|
|
|
10418 |
object if no parse error occurred.
|
|
|
10419 |
|
|
|
10420 |
@param[in] s a string representation of a JSON Pointer
|
|
|
10421 |
@return a JSON pointer object
|
|
|
10422 |
|
|
|
10423 |
@since version 2.0.0
|
|
|
10424 |
*/
|
|
|
10425 |
inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std::size_t)
|
|
|
10426 |
{
|
|
|
10427 |
return nlohmann::json::json_pointer(s);
|
|
|
10428 |
}
|
|
|
10429 |
|
|
|
10430 |
// restore GCC/clang diagnostic settings
|
|
|
10431 |
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
|
|
|
10432 |
#pragma GCC diagnostic pop
|
|
|
10433 |
#endif
|
|
|
10434 |
|
|
|
10435 |
#endif
|