/* Copyright (C) 2006 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _CONFTREE_H_
#define _CONFTREE_H_
/**
* A simple configuration file implementation.
*
* Configuration files have lines like 'name = value', and/or like '[subkey]'
*
* Lines like '[subkey]' in the file define subsections, with independant
* configuration namespaces. Only subsections holding at least one variable are
* significant (empty subsections may be deleted during an update, or not)
*
* Whitespace around name and value is insignificant.
*
* The names are case-sensitive but don't depend on it, this might change
*
* Values can be queried for, or set.
*
* Any line without a '=' is a comment (a line like #var = value
* actually assigns a variable named '#var', which is not a big issue)
*
* A configuration object can be created empty or by reading from a file or
* a string.
* All 'set' calls cause an immediate rewrite of the backing object if any
* (file or string)
*
* The ConfTree derived class interprets the subkeys as file paths and
* lets subdir keys hierarchically inherit the properties from
* parents.
*
* The ConfStack class stacks several Con(Simple/Tree) objects so that
* parameters from the top of the stack override the values from lower
* (useful to have central/personal config files)
*/
#include <time.h>
#include <algorithm>
#include <map>
#include <string>
#include <vector>
// rh7.3 likes iostream better...
#if defined(__GNUC__) && __GNUC__ < 3
#include <iostream>
#else
#include <istream>
#include <ostream>
#endif
#include "pathut.h"
using std::string;
using std::vector;
using std::map;
using std::istream;
using std::ostream;
/** Internal class used for storing presentation information */
class ConfLine {
public:
enum Kind {CFL_COMMENT, CFL_SK, CFL_VAR, CFL_VARCOMMENT};
Kind m_kind;
string m_data;
string m_aux;
ConfLine(Kind k, const string& d, string a = string())
: m_kind(k), m_data(d), m_aux(a) {
}
bool operator==(const ConfLine& o) {
return o.m_kind == m_kind && o.m_data == m_data;
}
};
/**
* Virtual base class used to define an interface mostly useful for testing
*/
class ConfNull {
public:
enum StatusCode {STATUS_ERROR = 0, STATUS_RO = 1, STATUS_RW = 2};
virtual ~ConfNull() {};
virtual int get(const string& name, string& value,
const string& sk = string()) const = 0;
virtual bool hasNameAnywhere(const string& nm) const = 0;
virtual int set(const string& nm, const string& val,
const string& sk = string()) = 0;
virtual bool ok() const = 0;
virtual vector<string> getNames(const string& sk, const char* = 0)const = 0;
virtual int erase(const string&, const string&) = 0;
virtual int eraseKey(const string&) = 0;
virtual void showall() const {};
virtual vector<string> getSubKeys() const = 0;
virtual vector<string> getSubKeys(bool) const = 0;
virtual bool holdWrites(bool) = 0;
virtual bool sourceChanged() const = 0;
};
/**
* Manages a simple configuration file with subsections.
*/
class ConfSimple : public ConfNull {
public:
/**
* Build the object by reading content from file.
* @param filename file to open
* @param readonly if true open readonly, else rw
* @param tildexp try tilde (home dir) expansion for subkey values
*/
ConfSimple(const char *fname, int readonly = 0, bool tildexp = false);
/**
* Build the object by reading content from a string
* @param data points to the data to parse.
* @param readonly if true open readonly, else rw
* @param tildexp try tilde (home dir) expansion for subsection names
*/
ConfSimple(const string& data, int readonly = 0, bool tildexp = false);
/**
* Build an empty object. This will be memory only, with no backing store.
* @param readonly if true open read only, else rw
* @param tildexp try tilde (home dir) expansion for subsection names
*/
ConfSimple(int readonly = 0, bool tildexp = false);
virtual ~ConfSimple() {};
/** Origin file changed. Only makes sense if we read the data from a file */
virtual bool sourceChanged() const;
/**
* Decide if we actually rewrite the backing-store after modifying the
* tree.
*/
virtual bool holdWrites(bool on) {
m_holdWrites = on;
if (on == false) {
return write();
} else {
return true;
}
}
/** Clear, then reparse from string */
void reparse(const string& in);
/** Clear all content */
void clear() {
m_submaps.clear();
m_order.clear();
}
/**
* Get string value for named parameter, from specified subsection (looks
* in global space if sk is empty).
* @return 0 if name not found, 1 else
*/
virtual int get(const string& name, string& value,
const string& sk = string()) const;
/**
* Get integer value for named parameter, from specified subsection (looks
* in global space if sk is empty).
* @return 0 if name not found, 1 else
*/
virtual int get(const string& name, int* value,
const string& sk = string()) const;
/**
* Set value for named string parameter in specified subsection (or global)
* @return 0 for error, 1 else
*/
virtual int set(const string& nm, const string& val,
const string& sk = string());
/**
* Set value for named integer parameter in specified subsection (or global)
* @return 0 for error, 1 else
*/
virtual int set(const string& nm, long long val,
const string& sk = string());
/**
* Remove name and value from config
*/
virtual int erase(const string& name, const string& sk);
/**
* Erase all names under given subkey (and subkey itself)
*/
virtual int eraseKey(const string& sk);
virtual StatusCode getStatus() const;
virtual bool ok() const {
return getStatus() != STATUS_ERROR;
}
/**
* Walk the configuration values, calling function for each.
* The function is called with a null nm when changing subsections (the
* value is then the new subsection name)
* @return WALK_STOP when/if the callback returns WALK_STOP,
* WALK_CONTINUE else (got to end of config)
*/
enum WalkerCode {WALK_STOP, WALK_CONTINUE};
virtual WalkerCode sortwalk(WalkerCode
(*wlkr)(void *cldata, const string& nm,
const string& val),
void *clidata) const;
/** Print all values to stdout */
virtual void showall() const;
/** Return all names in given submap. */
virtual vector<string> getNames(const string& sk, const char *pattern = 0)
const;
/** Check if name is present in any submap. This is relatively expensive
* but useful for saving further processing sometimes */
virtual bool hasNameAnywhere(const string& nm) const;
/**
* Return all subkeys
*/
virtual vector<string> getSubKeys(bool) const {
return getSubKeys();
}
virtual vector<string> getSubKeys() const;
/** Return subkeys in file order. BEWARE: only for the original from the
* file: the data is not duplicated to further copies */
virtual vector<string> getSubKeys_unsorted(bool = false) const {
return m_subkeys_unsorted;
}
/** Test for subkey existence */
virtual bool hasSubKey(const string& sk) const {
return m_submaps.find(sk) != m_submaps.end();
}
virtual string getFilename() const {
return m_filename;
}
/** Used with config files with specially formatted, xml-like comments.
* Extract the comments as text */
virtual bool commentsAsXML(ostream& out);
/** !! Note that assignment and copy constructor do not copy the
auxiliary data (m_order and subkeys_unsorted). */
/**
* Copy constructor. Expensive but less so than a full rebuild
*/
ConfSimple(const ConfSimple& rhs)
: ConfNull() {
if ((status = rhs.status) == STATUS_ERROR) {
return;
}
m_filename = rhs.m_filename;
m_submaps = rhs.m_submaps;
}
/**
* Assignement. This is expensive
*/
ConfSimple& operator=(const ConfSimple& rhs) {
if (this != &rhs && (status = rhs.status) != STATUS_ERROR) {
m_filename = rhs.m_filename;
m_submaps = rhs.m_submaps;
}
return *this;
}
/**
* Write in file format to out
*/
bool write(ostream& out) const;
/** Give access to semi-parsed file contents */
const vector<ConfLine>& getlines() const {
return m_order;
}
protected:
bool dotildexpand;
StatusCode status;
private:
// Set if we're working with a file
string m_filename;
time_t m_fmtime;
// Configuration data submaps (one per subkey, the main data has a
// null subkey)
map<string, map<string, string> > m_submaps;
vector<string> m_subkeys_unsorted;
// Presentation data. We keep the comments, empty lines and
// variable and subkey ordering information in there (for
// rewriting the file while keeping hand-edited information)
vector<ConfLine> m_order;
// Control if we're writing to the backing store
bool m_holdWrites;
void parseinput(istream& input);
bool write();
// Internal version of set: no RW checking
virtual int i_set(const string& nm, const string& val,
const string& sk, bool init = false);
bool i_changed(bool upd);
};
/**
* This is a configuration class which attaches tree-like signification to the
* submap names.
*
* If a given variable is not found in the specified section, it will be
* looked up the tree of section names, and in the global space.
*
* submap names should be '/' separated paths (ie: /sub1/sub2). No checking
* is done, but else the class adds no functionality to ConfSimple.
*
* NOTE: contrary to common behaviour, the global or root space is NOT
* designated by '/' but by '' (empty subkey). A '/' subkey will not
* be searched at all.
*
* Note: getNames() : uses ConfSimple method, this does *not* inherit
* names from englobing submaps.
*/
class ConfTree : public ConfSimple {
public:
/* The constructors just call ConfSimple's, asking for key tilde
* expansion */
ConfTree(const char *fname, int readonly = 0)
: ConfSimple(fname, readonly, true) {}
ConfTree(const string& data, int readonly = 0)
: ConfSimple(data, readonly, true) {}
ConfTree(int readonly = 0)
: ConfSimple(readonly, true) {}
virtual ~ConfTree() {};
ConfTree(const ConfTree& r) : ConfSimple(r) {};
ConfTree& operator=(const ConfTree& r) {
ConfSimple::operator=(r);
return *this;
}
/**
* Get value for named parameter, from specified subsection, or its
* parents.
* @return 0 if name not found, 1 else
*/
virtual int get(const string& name, string& value, const string& sk) const;
using ConfSimple::get;
};
/**
* Use several config files, trying to get values from each in order. Used to
* have a central config, with possible overrides from more specific
* (ie personal) ones.
*
* Notes: it's ok for some of the files not to exist, but the last
* one must or we generate an error. We open all trees readonly, except the
* topmost one if requested. All writes go to the topmost file. Note that
* erase() won't work except for parameters only defined in the topmost
* file (it erases only from there).
*/
template <class T> class ConfStack : public ConfNull {
public:
/// Construct from configuration file names. The earler
/// files in have priority when fetching values. Only the first
/// file will be updated if ro is false and set() is used.
ConfStack(const vector<string>& fns, bool ro = true) {
construct(fns, ro);
}
/// Construct out of single file name and multiple directories
ConfStack(const string& nm, const vector<string>& dirs, bool ro = true) {
vector<string> fns;
for (vector<string>::const_iterator it = dirs.begin();
it != dirs.end(); it++) {
fns.push_back(path_cat(*it, nm));
}
ConfStack::construct(fns, ro);
}
ConfStack(const ConfStack& rhs)
: ConfNull() {
init_from(rhs);
}
virtual ~ConfStack() {
clear();
m_ok = false;
}
ConfStack& operator=(const ConfStack& rhs) {
if (this != &rhs) {
clear();
m_ok = rhs.m_ok;
if (m_ok) {
init_from(rhs);
}
}
return *this;
}
virtual bool sourceChanged() const {
typename vector<T*>::const_iterator it;
for (it = m_confs.begin(); it != m_confs.end(); it++) {
if ((*it)->sourceChanged()) {
return true;
}
}
return false;
}
virtual int get(const string& name, string& value, const string& sk,
bool shallow) const {
typename vector<T*>::const_iterator it;
for (it = m_confs.begin(); it != m_confs.end(); it++) {
if ((*it)->get(name, value, sk)) {
return true;
}
if (shallow) {
break;
}
}
return false;
}
virtual int get(const string& name, string& value, const string& sk) const {
return get(name, value, sk, false);
}
virtual bool hasNameAnywhere(const string& nm) const {
typename vector<T*>::const_iterator it;
for (it = m_confs.begin(); it != m_confs.end(); it++) {
if ((*it)->hasNameAnywhere(nm)) {
return true;
}
}
return false;
}
virtual int set(const string& nm, const string& val,
const string& sk = string()) {
if (!m_ok) {
return 0;
}
//LOGDEB2(("ConfStack::set [%s]:[%s] -> [%s]\n", sk.c_str(),
//nm.c_str(), val.c_str()));
// Avoid adding unneeded entries: if the new value matches the
// one out from the deeper configs, erase or dont add it
// from/to the topmost file
typename vector<T*>::iterator it = m_confs.begin();
it++;
while (it != m_confs.end()) {
string value;
if ((*it)->get(nm, value, sk)) {
// This file has value for nm/sk. If it is the same as the new
// one, no need for an entry in the topmost file. Else, stop
// looking and add the new entry
if (value == val) {
m_confs.front()->erase(nm, sk);
return true;
} else {
break;
}
}
it++;
}
return m_confs.front()->set(nm, val, sk);
}
virtual int erase(const string& nm, const string& sk) {
return m_confs.front()->erase(nm, sk);
}
virtual int eraseKey(const string& sk) {
return m_confs.front()->eraseKey(sk);
}
virtual bool holdWrites(bool on) {
return m_confs.front()->holdWrites(on);
}
virtual vector<string> getNames(const string& sk, const char *pattern = 0)
const {
return getNames1(sk, pattern, false);
}
virtual vector<string> getNamesShallow(const string& sk,
const char *patt = 0) const {
return getNames1(sk, patt, true);
}
virtual vector<string> getNames1(const string& sk, const char *pattern,
bool shallow) const {
vector<string> nms;
typename vector<T*>::const_iterator it;
bool skfound = false;
for (it = m_confs.begin(); it != m_confs.end(); it++) {
if ((*it)->hasSubKey(sk)) {
skfound = true;
vector<string> lst = (*it)->getNames(sk, pattern);
nms.insert(nms.end(), lst.begin(), lst.end());
}
if (shallow && skfound) {
break;
}
}
sort(nms.begin(), nms.end());
vector<string>::iterator uit = unique(nms.begin(), nms.end());
nms.resize(uit - nms.begin());
return nms;
}
virtual vector<string> getSubKeys() const {
return getSubKeys(false);
}
virtual vector<string> getSubKeys(bool shallow) const {
vector<string> sks;
typename vector<T*>::const_iterator it;
for (it = m_confs.begin(); it != m_confs.end(); it++) {
vector<string> lst;
lst = (*it)->getSubKeys();
sks.insert(sks.end(), lst.begin(), lst.end());
if (shallow) {
break;
}
}
sort(sks.begin(), sks.end());
vector<string>::iterator uit = unique(sks.begin(), sks.end());
sks.resize(uit - sks.begin());
return sks;
}
virtual bool ok() const {
return m_ok;
}
private:
bool m_ok;
vector<T*> m_confs;
/// Reset to pristine
void clear() {
typename vector<T*>::iterator it;
for (it = m_confs.begin(); it != m_confs.end(); it++) {
delete(*it);
}
m_confs.clear();
}
/// Common code to initialize from existing object
void init_from(const ConfStack& rhs) {
if ((m_ok = rhs.m_ok)) {
typename vector<T*>::const_iterator it;
for (it = rhs.m_confs.begin(); it != rhs.m_confs.end(); it++) {
m_confs.push_back(new T(**it));
}
}
}
/// Common construct from file names code
void construct(const vector<string>& fns, bool ro) {
vector<string>::const_iterator it;
bool lastok = false;
for (it = fns.begin(); it != fns.end(); it++) {
T* p = new T(it->c_str(), ro);
if (p && p->ok()) {
m_confs.push_back(p);
lastok = true;
} else {
delete p;
lastok = false;
if (!ro) {
// For rw acccess, the topmost file needs to be ok
// (ro is set to true after the first file)
break;
}
}
ro = true;
}
m_ok = lastok;
}
};
#endif /*_CONFTREE_H_ */