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 org.sonar.channel.CodeReader;
023    import org.sonar.channel.EndMatcher;
024    
025    public 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    }