345 lines
10 KiB
C++
345 lines
10 KiB
C++
/* Copyright (C) 2004 J.F.Dockes
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _SEARCHDATA_H_INCLUDED_
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#define _SEARCHDATA_H_INCLUDED_
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/**
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* Structures to hold data coming almost directly from the gui
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* and handle its translation to Xapian queries.
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* This is not generic code, it reflects the choices made for the user
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* interface, and it also knows some specific of recoll's usage of Xapian
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* (ie: term prefixes)
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*/
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#include <string>
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#include <vector>
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#include "rcldb.h"
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#include "refcntr.h"
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#include "smallut.h"
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#include "cstr.h"
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#include "hldata.h"
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class RclConfig;
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namespace Rcl {
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/** Search clause types */
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enum SClType {
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SCLT_AND,
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SCLT_OR, SCLT_EXCL, SCLT_FILENAME, SCLT_PHRASE, SCLT_NEAR,
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SCLT_SUB
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};
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class SearchDataClause;
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/**
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Data structure representing a Recoll user query, for translation
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into a Xapian query tree. This could probably better called a 'question'.
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This is a list of search clauses combined through either OR or AND.
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Clauses either reflect user entry in a query field: some text, a
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clause type (AND/OR/NEAR etc.), possibly a distance, or points to
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another SearchData representing a subquery.
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The content of each clause when added may not be fully parsed yet
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(may come directly from a gui field). It will be parsed and may be
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translated to several queries in the Xapian sense, for exemple
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several terms and phrases as would result from
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["this is a phrase" term1 term2] .
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This is why the clauses also have an AND/OR/... type.
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A phrase clause could be added either explicitly or using double quotes:
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{SCLT_PHRASE, [this is a phrase]} or as {SCLT_XXX, ["this is a phrase"]}
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*/
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class SearchData {
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public:
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SearchData(SClType tp)
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: m_tp(tp), m_topdirexcl(false), m_topdirweight(1.0),
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m_haveDates(false), m_maxSize(size_t(-1)),
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m_minSize(size_t(-1)), m_haveWildCards(false)
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{
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if (m_tp != SCLT_OR && m_tp != SCLT_AND)
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m_tp = SCLT_OR;
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}
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~SearchData() {erase();}
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/** Make pristine */
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void erase();
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/** Is there anything but a file name search in here ? */
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bool fileNameOnly();
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/** Do we have wildcards anywhere apart from filename searches ? */
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bool haveWildCards() {return m_haveWildCards;}
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/** Translate to Xapian query. rcldb knows about the void* */
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bool toNativeQuery(Rcl::Db &db, void *);
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/** We become the owner of cl and will delete it */
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bool addClause(SearchDataClause *cl);
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/** If this is a simple query (one field only, no distance clauses),
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* add phrase made of query terms to query, so that docs containing the
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* user terms in order will have higher relevance. This must be called
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* before toNativeQuery().
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* @param threshold: don't use terms more frequent than the value
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* (proportion of docs where they occur)
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*/
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bool maybeAddAutoPhrase(Rcl::Db &db, double threshold);
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/** Set/get top subdirectory for filtering results */
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void setTopdir(const std::string& t, bool excl = false, float w = 1.0)
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{
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m_topdir = t;
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m_topdirexcl = excl;
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m_topdirweight = w;
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}
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void setMinSize(size_t size) {m_minSize = size;}
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void setMaxSize(size_t size) {m_maxSize = size;}
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/** Set date span for filtering results */
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void setDateSpan(DateInterval *dip) {m_dates = *dip; m_haveDates = true;}
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/** Add file type for filtering results */
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void addFiletype(const std::string& ft) {m_filetypes.push_back(ft);}
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/** Add file type to not wanted list */
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void remFiletype(const std::string& ft) {m_nfiletypes.push_back(ft);}
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void setStemlang(const std::string& lang = "english") {m_stemlang = lang;}
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/** Retrieve error description */
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std::string getReason() {return m_reason;}
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/** Return term expansion data. Mostly used by caller for highlighting
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*/
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void getTerms(HighlightData& hldata) const;
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/**
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* Get/set the description field which is retrieved from xapian after
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* initializing the query. It is stored here for usage in the GUI.
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*/
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std::string getDescription() {return m_description;}
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void setDescription(const std::string& d) {m_description = d;}
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private:
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// Combine type. Only SCLT_AND or SCLT_OR here
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SClType m_tp;
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// Complex query descriptor
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std::vector<SearchDataClause*> m_query;
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// Restricted set of filetypes if not empty.
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std::vector<std::string> m_filetypes;
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// Excluded set of file types if not empty
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std::vector<std::string> m_nfiletypes;
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// Restrict to subtree.
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std::string m_topdir;
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bool m_topdirexcl; // Invert meaning
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float m_topdirweight; // affect weight instead of filter
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bool m_haveDates;
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DateInterval m_dates; // Restrict to date interval
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size_t m_maxSize;
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size_t m_minSize;
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// Printable expanded version of the complete query, retrieved/set
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// from rcldb after the Xapian::setQuery() call
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std::string m_description;
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std::string m_reason;
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bool m_haveWildCards;
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std::string m_stemlang;
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bool expandFileTypes(RclConfig *cfg, std::vector<std::string>& exptps);
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/* Copyconst and assignment private and forbidden */
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SearchData(const SearchData &) {}
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SearchData& operator=(const SearchData&) {return *this;};
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};
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class SearchDataClause {
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public:
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enum Modifier {SDCM_NONE=0, SDCM_NOSTEMMING=1, SDCM_ANCHORSTART=2,
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SDCM_ANCHOREND=4};
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SearchDataClause(SClType tp)
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: m_tp(tp), m_parentSearch(0), m_haveWildCards(0),
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m_modifiers(SDCM_NONE), m_weight(1.0)
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{}
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virtual ~SearchDataClause() {}
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virtual bool toNativeQuery(Rcl::Db &db, void *, const std::string&) = 0;
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bool isFileName() const {return m_tp == SCLT_FILENAME ? true: false;}
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virtual std::string getReason() const {return m_reason;}
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virtual void getTerms(HighlightData & hldata) const = 0;
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SClType getTp()
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{
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return m_tp;
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}
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void setParent(SearchData *p)
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{
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m_parentSearch = p;
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}
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virtual void setModifiers(Modifier mod)
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{
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m_modifiers = mod;
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}
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virtual int getModifiers()
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{
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return m_modifiers;
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}
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virtual void addModifier(Modifier mod)
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{
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int imod = getModifiers();
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imod |= mod;
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setModifiers(Modifier(imod));
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}
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virtual void setWeight(float w)
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{
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m_weight = w;
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}
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friend class SearchData;
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protected:
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std::string m_reason;
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SClType m_tp;
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SearchData *m_parentSearch;
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bool m_haveWildCards;
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Modifier m_modifiers;
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float m_weight;
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private:
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SearchDataClause(const SearchDataClause&)
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{
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}
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SearchDataClause& operator=(const SearchDataClause&)
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{
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return *this;
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}
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};
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/**
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* "Simple" data clause with user-entered query text. This can include
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* multiple phrases and words, but no specified distance.
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*/
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class SearchDataClauseSimple : public SearchDataClause {
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public:
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SearchDataClauseSimple(SClType tp, const std::string& txt,
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const std::string& fld = std::string())
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: SearchDataClause(tp), m_text(txt), m_field(fld)
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{
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m_haveWildCards =
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(txt.find_first_of(cstr_minwilds) != std::string::npos);
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}
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virtual ~SearchDataClauseSimple()
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{
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}
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/** Translate to Xapian query */
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virtual bool toNativeQuery(Rcl::Db &, void *, const std::string& stemlang);
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virtual void getTerms(HighlightData& hldata) const
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{
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hldata.append(m_hldata);
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}
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virtual const std::string& gettext()
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{
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return m_text;
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}
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virtual const std::string& getfield()
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{
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return m_field;
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}
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protected:
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std::string m_text; // Raw user entry text.
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std::string m_field; // Field specification if any
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HighlightData m_hldata;
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};
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/**
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* Filename search clause. This is special because term expansion is only
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* performed against the unsplit file name terms.
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*
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* There is a big advantage in expanding only against the
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* field, especially for file names, because this makes searches for
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* "*xx" much faster (no need to scan the whole main index).
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*/
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class SearchDataClauseFilename : public SearchDataClauseSimple {
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public:
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SearchDataClauseFilename(const std::string& txt)
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: SearchDataClauseSimple(SCLT_FILENAME, txt)
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{
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// File name searches don't count when looking for wild cards.
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m_haveWildCards = false;
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}
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virtual ~SearchDataClauseFilename()
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{
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}
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virtual bool toNativeQuery(Rcl::Db &, void *, const std::string& stemlang);
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};
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/**
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* A clause coming from a NEAR or PHRASE entry field. There is only one
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* std::string group, and a specified distance, which applies to it.
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*/
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class SearchDataClauseDist : public SearchDataClauseSimple {
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public:
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SearchDataClauseDist(SClType tp, const std::string& txt, int slack,
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const std::string& fld = std::string())
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: SearchDataClauseSimple(tp, txt, fld), m_slack(slack)
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{
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}
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virtual ~SearchDataClauseDist()
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{
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}
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virtual bool toNativeQuery(Rcl::Db &, void *, const std::string& stemlang);
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private:
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int m_slack;
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};
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/** Subquery */
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class SearchDataClauseSub : public SearchDataClause {
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public:
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// We take charge of the SearchData * and will delete it.
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SearchDataClauseSub(SClType tp, RefCntr<SearchData> sub)
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: SearchDataClause(tp), m_sub(sub)
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{
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}
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virtual ~SearchDataClauseSub()
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{
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}
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virtual bool toNativeQuery(Rcl::Db &db, void *p, const std::string&)
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{
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return m_sub->toNativeQuery(db, p);
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}
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virtual void getTerms(HighlightData& hldata) const
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{
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m_sub.getconstptr()->getTerms(hldata);
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}
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protected:
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RefCntr<SearchData> m_sub;
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};
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} // Namespace Rcl
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#endif /* _SEARCHDATA_H_INCLUDED_ */
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