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79 lines
1.7 KiB
79 lines
1.7 KiB
3 years ago
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//
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// parser.h
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//
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// parser: Parses a boolean expression tree, retrieving and scoring
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// the resulting document list
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1995-2004 The ht://Dig Group
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// For copyright details, see the file COPYING in your distribution
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// or the GNU Library General Public License (LGPL) version 2 or later
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// <http://www.gnu.org/copyleft/lgpl.html>
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//
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// $Id: parser.h,v 1.18 2004/05/28 13:15:25 lha Exp $
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//
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#ifndef _parser_h_
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#define _parser_h_
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#include "htsearch.h"
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#include "WeightWord.h"
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#include "ResultList.h"
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#include "DocMatch.h"
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#include "Database.h"
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#include "htString.h"
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#include "Stack.h"
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#include "HtWordList.h"
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#include <ctype.h>
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class Collection;
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class Parser
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{
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public:
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Parser();
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int checkSyntax(List *);
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void parse(List *, ResultList &);
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// void setDatabase(const String& db) { words.Open(db, O_RDONLY); }
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void setCollection(Collection *collection);
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char *getErrorMessage() {return error.get();}
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int hadError() {return valid == 0;}
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protected:
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void fullexpr(int);
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int lexan();
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void phrase(int);
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void expr(int);
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void term(int);
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void factor(int);
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int match(int);
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void setError(char *);
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void perform_push();
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void perform_and();
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void perform_not();
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void perform_or();
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void perform_phrase(List * &);
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void score(List *, double weight, unsigned int flags);
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List *tokens;
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List *result;
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WeightWord *current;
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int lookahead;
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int valid;
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Stack stack;
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String error;
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Collection *collection; // Multiple database support
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HtWordList words;
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};
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extern StringList boolean_keywords;
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enum KeywordIndices { AND, OR, NOT };
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#endif
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