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117 lines
2.7 KiB
117 lines
2.7 KiB
//
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// Regexp.cc
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//
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// Regexp: A fuzzy to match input regex against the word database.
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// Based on the substring fuzzy
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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: Regexp.cc,v 1.5 2004/05/28 13:15:20 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 /* HAVE_CONFIG_H */
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#include <fcntl.h>
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#include "Regexp.h"
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#include "htString.h"
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#include "List.h"
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#include "StringMatch.h"
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#include "HtConfiguration.h"
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//*****************************************************************************
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// Regexp::Regexp(const HtConfiguration& config_arg)
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//
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Regexp::Regexp(const HtConfiguration& config_arg) :
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Fuzzy(config_arg)
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{
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name = "regex";
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}
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//*****************************************************************************
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// Regexp::~Regexp()
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//
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Regexp::~Regexp()
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{
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}
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//*****************************************************************************
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// A very simplistic and inefficient regex search. For every word
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// that is looked for we do a complete linear search through the word
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// database.
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// Maybe a better method of doing this would be to mmap a list of words
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// to memory and then run the regex on it. It would still be a
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// linear search, but with much less overhead.
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//
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void
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Regexp::getWords(char *pattern, List &words)
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{
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HtRegex regexMatch;
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String stripped (pattern);
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// First we have to strip the necessary punctuation
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// Why?? lha
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// stripped.remove("^.[]$()|*+?{},-\\");
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// Anchor the string to be matched
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regexMatch.set(String("^") + stripped);
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HtWordList wordDB(config);
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List *wordList;
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String *key;
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wordDB.Open(config["word_db"], O_RDONLY);
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wordList = wordDB.Words();
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int wordCount = 0;
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int maximumWords = config.Value("regex_max_words", 25);
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wordList->Start_Get();
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while (wordCount < maximumWords && (key = (String *) wordList->Get_Next()))
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{
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if (regexMatch.match(*key, 0, 0) != 0)
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{
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words.Add(new String(*key));
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wordCount++;
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}
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}
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if (wordList) {
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wordList->Destroy();
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delete wordList;
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}
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wordDB.Close();
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}
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//*****************************************************************************
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int
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Regexp::openIndex()
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{
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return 0;
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}
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//*****************************************************************************
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void
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Regexp::generateKey(char *, String &)
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{
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}
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//*****************************************************************************
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void
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Regexp::addWord(char *)
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{
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}
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