001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.colorizer;
021    
022    import java.util.regex.Matcher;
023    import java.util.regex.Pattern;
024    
025    import org.sonar.channel.CodeReader;
026    
027    public class RegexpTokenizer extends NotThreadSafeTokenizer{
028    
029      private final String tagBefore;
030      private final String tagAfter;
031      private final Matcher matcher;
032      private final StringBuilder tmpBuilder = new StringBuilder();
033    
034      /**
035       * @param tagBefore
036       *          Html tag to add before the token
037       * @param tagAfter
038       *          Html tag to add after the token
039       * @param regexp
040       *          Regular expression which must be used to match token
041       */
042      public RegexpTokenizer(String tagBefore, String tagAfter, String regexp) {
043        this.tagBefore = tagBefore;
044        this.tagAfter = tagAfter;
045        this.matcher = Pattern.compile(regexp).matcher("");
046      }
047    
048      @Override
049      public boolean consume(CodeReader code, HtmlCodeBuilder codeBuilder) {
050        if (code.popTo(matcher, tmpBuilder) > 0) {
051          codeBuilder.appendWithoutTransforming(tagBefore);
052          codeBuilder.append(tmpBuilder);
053          codeBuilder.appendWithoutTransforming(tagAfter);
054          tmpBuilder.delete(0, tmpBuilder.length());
055          return true;
056        }
057        return false;
058      }
059    
060      public RegexpTokenizer clone() {
061        return new RegexpTokenizer(tagBefore, tagAfter, matcher.pattern().pattern());
062      }
063    }