/*
* 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 _SEARCHDATA_H_INCLUDED_
#define _SEARCHDATA_H_INCLUDED_
/* @(#$Id: searchdata.h,v 1.20 2008-09-29 11:33:55 dockes Exp $ (C) 2004 J.F.Dockes */
/**
* Structures to hold data coming almost directly from the gui
* and handle its translation to Xapian queries.
* This is not generic code, it reflects the choices made for the user
* interface, and it also knows some specific of recoll's usage of Xapian
* (ie: term prefixes)
*/
#include <string>
#include <vector>
#include "rcldb.h"
#include "refcntr.h"
#ifndef NO_NAMESPACES
using std::vector;
using std::string;
namespace Rcl {
#endif // NO_NAMESPACES
/** Search clause types */
enum SClType {
SCLT_AND,
SCLT_OR, SCLT_EXCL, SCLT_FILENAME, SCLT_PHRASE, SCLT_NEAR,
SCLT_SUB
};
class SearchDataClause;
/**
Data structure representing a Recoll user query, for translation
into a Xapian query tree. This could probably better called a 'question'.
This is a list of search clauses combined through either OR or AND.
Clauses either reflect user entry in a query field: some text, a
clause type (AND/OR/NEAR etc.), possibly a distance, or points to
another SearchData representing a subquery.
The content of each clause when added may not be fully parsed yet
(may come directly from a gui field). It will be parsed and may be
translated to several queries in the Xapian sense, for exemple
several terms and phrases as would result from
["this is a phrase" term1 term2] .
This is why the clauses also have an AND/OR/... type.
A phrase clause could be added either explicitely or using double quotes:
{SCLT_PHRASE, [this is a phrase]} or as {SCLT_XXX, ["this is a phrase"]}
*/
class SearchData {
public:
SearchData(SClType tp) : m_tp(tp), m_haveWildCards(false) {}
~SearchData() {erase();}
/** Make pristine */
void erase();
/** Is there anything but a file name search in here ? */
bool fileNameOnly();
/** Do we have wildcards anywhere apart from filename searches ? */
bool haveWildCards() {return m_haveWildCards;}
/** Translate to Xapian query. rcldb knows about the void* */
bool toNativeQuery(Rcl::Db &db, void *);
/** We become the owner of cl and will delete it */
bool addClause(SearchDataClause *cl);
/** Retrieve error description */
string getReason() {return m_reason;}
/** Get terms and phrase/near groups. Used in the GUI for highlighting
* The groups and gslks vectors are parallel and hold the phrases/near
* string groups and their associated slacks (distance in excess of group
* size)
*/
bool getTerms(vector<string>& terms,
vector<vector<string> >& groups, vector<int>& gslks) const;
/**
* Get/set the description field which is retrieved from xapian after
* initializing the query. It is stored here for usage in the GUI.
*/
string getDescription() {return m_description;}
void setDescription(const string& d) {m_description = d;}
/** Get/set top subdirectory for filtering results */
string getTopdir() {return m_topdir;}
void setTopdir(const string& t) {m_topdir = t;}
/** Add file type for filtering results */
void addFiletype(const string& ft) {m_filetypes.push_back(ft);}
void setStemlang(const string& lang = "english") {m_stemlang = lang;}
private:
SClType m_tp; // Only SCLT_AND or SCLT_OR here
vector<SearchDataClause*> m_query;
vector<string> m_filetypes; // Restrict to filetypes if set.
string m_topdir; // Restrict to subtree.
// Printable expanded version of the complete query, retrieved/set
// from rcldb after the Xapian::setQuery() call
string m_description;
string m_reason;
bool m_haveWildCards;
string m_stemlang;
/* Copyconst and assignment private and forbidden */
SearchData(const SearchData &) {}
SearchData& operator=(const SearchData&) {return *this;};
};
class SearchDataClause {
public:
enum Modifier {SDCM_NONE=0, SDCM_NOSTEMMING=1};
SearchDataClause(SClType tp)
: m_tp(tp), m_parentSearch(0), m_haveWildCards(0),
m_modifiers(SDCM_NONE)
{}
virtual ~SearchDataClause() {}
virtual bool toNativeQuery(Rcl::Db &db, void *, const string&) = 0;
bool isFileName() const {return m_tp == SCLT_FILENAME ? true: false;}
virtual string getReason() const {return m_reason;}
virtual bool getTerms(vector<string>&, vector<vector<string> >&,
vector<int>&) const
{return true;}
SClType getTp() {return m_tp;}
void setParent(SearchData *p) {m_parentSearch = p;}
virtual void setModifiers(Modifier mod) {m_modifiers = mod;}
friend class SearchData;
protected:
string m_reason;
SClType m_tp;
SearchData *m_parentSearch;
bool m_haveWildCards;
Modifier m_modifiers;
private:
SearchDataClause(const SearchDataClause&) {}
SearchDataClause& operator=(const SearchDataClause&) {
return *this;
}
};
/**
* "Simple" data clause with user-entered query text. This can include
* multiple phrases and words, but no specified distance.
*/
class SearchDataClauseSimple : public SearchDataClause {
public:
SearchDataClauseSimple(SClType tp, const string& txt,
const string& fld = string())
: SearchDataClause(tp), m_text(txt), m_field(fld), m_slack(0) {
m_haveWildCards = (txt.find_first_of("*?[") != string::npos);
}
virtual ~SearchDataClauseSimple() {}
/** Translate to Xapian query */
virtual bool toNativeQuery(Rcl::Db &db, void *, const string& stemlang);
/** Retrieve query terms and term groups. This is used for highlighting */
virtual bool getTerms(vector<string>& terms, /* Single terms */
vector<vector<string> >& groups, /* Prox grps */
vector<int>& gslks) const /* Prox slacks */
{
terms.insert(terms.end(), m_terms.begin(), m_terms.end());
groups.insert(groups.end(), m_groups.begin(), m_groups.end());
gslks.insert(gslks.end(), m_groups.size(), m_slack);
return true;
}
protected:
string m_text; // Raw user entry text.
string m_field; // Field specification if any
// Single terms and phrases resulting from breaking up m_text;
// valid after toNativeQuery() call
vector<string> m_terms;
vector<vector<string> > m_groups;
// Declare m_slack here. Always 0, but allows getTerms to work for
// SearchDataClauseDist
int m_slack;
};
/** Filename search clause. This is special because term expansion is only
* performed against the XSFN terms (it's performed against the main index
* for all other fields). Else we could just use a "filename:" field
* This doesn't really make sense (either). I think we could either expand
* filenames against all terms and then select the XSFN ones, or always perform
* expansion only against the field's terms ? Anyway this doesn't hurt
* much either.
*
* There is a big advantage though in expanding only against the
* field, especially for file names, because this makes searches for
* "*xx" much faster (no need to scan the whole main index).
*/
class SearchDataClauseFilename : public SearchDataClauseSimple {
public:
SearchDataClauseFilename(const string& txt)
: SearchDataClauseSimple(SCLT_FILENAME, txt) {
// File name searches don't count when looking for wild cards.
m_haveWildCards = false;
}
virtual ~SearchDataClauseFilename() {}
virtual bool toNativeQuery(Rcl::Db &db, void *, const string& stemlang);
};
/**
* A clause coming from a NEAR or PHRASE entry field. There is only one
* string group, and a specified distance, which applies to it.
*/
class SearchDataClauseDist : public SearchDataClauseSimple {
public:
SearchDataClauseDist(SClType tp, const string& txt, int slack,
const string& fld = string())
: SearchDataClauseSimple(tp, txt, fld) {m_slack = slack;}
virtual ~SearchDataClauseDist() {}
virtual bool toNativeQuery(Rcl::Db &db, void *, const string& stemlang);
// m_slack is declared in SearchDataClauseSimple
};
/** Subquery */
class SearchDataClauseSub : public SearchDataClause {
public:
// We take charge of the SearchData * and will delete it.
SearchDataClauseSub(SClType tp, RefCntr<SearchData> sub)
: SearchDataClause(tp), m_sub(sub) {}
virtual ~SearchDataClauseSub() {}
virtual bool toNativeQuery(Rcl::Db &db, void *, const string& stemlang);
protected:
RefCntr<SearchData> m_sub;
};
} // Namespace Rcl
#endif /* _SEARCHDATA_H_INCLUDED_ */