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#ifndef _SimpleQueryParser_h_
#define _SimpleQueryParser_h_
//
// SimpleQueryParser.h
//
// SimpleQueryParser: (abstract) a family of parsers that generate queries
// for strings with the syntax (word|phrase){(word|phrase)}
// combining them in a single operator.
// The operator to apply is tbd by concrete classes.
//
// Part of the ht://Dig package <http://www.htdig.org/>
// Copyright (c) 1995-2004 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Library General Public License (LGPL) version 2 or later
// <http://www.gnu.org/copyleft/lgpl.html>
//
// $Id: SimpleQueryParser.h,v 1.4 2004/05/28 13:15:24 lha Exp $
//
#include "QueryParser.h"
#include "SimpleLexer.h"
// abstract
class OperatorQuery;
class SimpleQueryParser : public QueryParser
{
public:
virtual ~SimpleQueryParser() {}
protected:
SimpleQueryParser() {}
// get a combination query
virtual OperatorQuery *MakeQuery() = 0;
private:
// apply expr == term { term }
Query *ParseExpression();
// apply term == word | phrase
Query *ParseTerm();
// let the parent access the lexer
QueryLexer &Token() { return token; }
// the used lexer
SimpleLexer token;
};
#endif
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