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72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
#ifndef _QueryLexer_h_
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#define _QueryLexer_h_
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//
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// QueryLexer.h
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//
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// QueryLexer: (abstract) a lexical analyzer used by a QueryParser.
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// This class defines the common public interface of this
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// family of lexers. It implements a tokenizer, and also
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// the definition of the 'quote' and 'end' terminal symbols.
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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: QueryLexer.h,v 1.4 2004/05/28 13:15:24 lha Exp $
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//
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#ifdef HAVE_CONFIG_H
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#include "htconfig.h"
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#endif
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#include "htString.h"
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class QueryLexer
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{
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public:
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virtual ~QueryLexer() {}
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// set the query string and advance to the first token
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void Set(const String &query_string);
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// advance to the next token
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virtual void Next();
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// is the current token a word?
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virtual bool IsWord() const = 0;
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// is the current token a quote sign?
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bool IsQuote() const;
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// is the current token end-of-query?
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bool IsEnd() const;
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// get the current token value
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const String &Value() const { return current; }
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// get the full query string
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const String &FullString() const { return query; }
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protected:
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QueryLexer();
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// the full query string
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String query;
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// the current token value
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String current;
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// the current position in the query string
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int current_char;
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// suffix string used by the 'prefix' fuzzy
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String prefix_match;
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};
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#endif
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