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 */
020package org.sonar.colorizer;
021
022import java.util.regex.Matcher;
023import java.util.regex.Pattern;
024
025import org.sonar.channel.CodeReader;
026
027public 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  @Override
061  public RegexpTokenizer clone() {
062    return new RegexpTokenizer(tagBefore, tagAfter, matcher.pattern().pattern());
063  }
064}