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 org.sonar.channel.CodeReader;
023import org.sonar.channel.EndMatcher;
024
025public class LiteralTokenizer extends Tokenizer {
026
027  private final String tagBefore;
028  private final String tagAfter;
029
030  public LiteralTokenizer(String tagBefore, String tagAfter) {
031    this.tagBefore = tagBefore;
032    this.tagAfter = tagAfter;
033  }
034
035  public LiteralTokenizer() {
036    this("", "");
037  }
038
039  @Override
040  public boolean consume(CodeReader code, HtmlCodeBuilder codeBuilder) {
041    if (code.peek() == '\'' || code.peek() == '\"') {
042      codeBuilder.appendWithoutTransforming(tagBefore);
043      int firstChar = code.peek();
044      code.popTo(new EndCommentMatcher(firstChar, code), codeBuilder);
045      codeBuilder.appendWithoutTransforming(tagAfter);
046      return true;
047    } else {
048      return false;
049    }
050  }
051
052  private static class EndCommentMatcher implements EndMatcher {
053
054    private final int firstChar;
055    private final CodeReader code;
056    private StringBuilder literalValue;
057
058    public EndCommentMatcher(int firstChar, CodeReader code) {
059      this.firstChar = firstChar;
060      this.code = code;
061      literalValue = new StringBuilder();
062    }
063
064    public boolean match(int endFlag) {
065      literalValue.append((char) endFlag);
066      return (code.lastChar() == firstChar && evenNumberOfBackSlashBeforeDelimiter() && literalValue.length() > 1);
067    }
068
069    private boolean evenNumberOfBackSlashBeforeDelimiter() {
070      int numberOfBackSlashChar = 0;
071      for (int index = literalValue.length() - 3; index >= 0; index--) {
072        if (literalValue.charAt(index) == '\\') {
073          numberOfBackSlashChar++;
074        } else {
075          break;
076        }
077      }
078      return numberOfBackSlashChar % 2 == 0;
079    }
080  }
081}