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//
// QueryLexer.cc
//
// QueryLexer: (abstract) a lexical analyzer used by a QueryParser.
// This class defines the common public interface of this
// family of lexers. It implements a tokenizer, and also
// the definition of the 'quote' and 'end' terminal symbols.
//
// 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: QueryLexer.cc,v 1.4 2004/05/28 13:15:24 lha Exp $
//
#include "QueryLexer.h"
#include "defaults.h"
#include "WordType.h"
extern int debug;
QueryLexer::QueryLexer()
{
HtConfiguration* config= HtConfiguration::config();
prefix_match = config->Find("prefix_match_character");
}
void
QueryLexer::Set(const String &query_string)
{
query = query_string;
current_char = 0;
Next();
}
void
QueryLexer::Next()
{
HtConfiguration* config= HtConfiguration::config();
unsigned char text = query[current_char];
WordType type(*config);
current = "";
while (text
&& !current.length()
&& !type.IsStrictChar(text))
{
if (text == '(' || text == ')' || text == '\"' || text == '/')
{
current << text;
if (debug) cerr << "lexer symbol: " << current << endl;
}
text = query[++current_char];
}
if (!current.length() && text)
{
while (text
&& (type.IsChar(text) && text != '/'
|| prefix_match.indexOf(text, 0) != -1))
{
current << text;
text = query[++current_char];
}
}
current.lowercase();
if (debug) cerr << "lexer current word: " << current << endl;
}
bool
QueryLexer::IsEnd() const
{
return current == String("");
}
bool
QueryLexer::IsQuote() const
{
return current == String("\"");
}
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