001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
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    public class StringTokenizer extends Tokenizer {
023    
024      public StringTokenizer(String tagBefore, String tagAfter) {
025        super(tagBefore, tagAfter);
026      }
027    
028      public StringTokenizer() {
029        super("", "");
030      }
031    
032      @Override
033      public boolean hasNextToken(CodeReader code) {
034        return code.peek() == '\'' || code.peek() == '\"';
035      }
036    
037      @Override
038      public String nextToken(CodeReader code) {
039        int firstChar = code.peek();
040        return code.popTo(new EndCommentMatcher(firstChar, code));
041      }
042    
043      private static class EndCommentMatcher implements EndTokenMatcher {
044        private final int firstChar;
045        private final CodeReader code;
046        private StringBuilder literalValue;
047    
048        public EndCommentMatcher(int firstChar, CodeReader code) {
049          this.firstChar = firstChar;
050          this.code = code;
051          literalValue = new StringBuilder();
052        }
053    
054        public boolean match(int endFlag) {
055          literalValue.append((char)endFlag);
056          return (code.lastChar() == firstChar && evenNumberOfBackSlashBeforeDelimiter() && literalValue.length() > 1);
057        }
058        
059        private boolean evenNumberOfBackSlashBeforeDelimiter() {
060          int numberOfBackSlashChar = 0;
061          for (int index = literalValue.length() - 3; index >= 0; index--) {
062            if (literalValue.charAt(index) == '\\') {
063              numberOfBackSlashChar++;
064            } else {
065              break;
066            }
067          }
068          return numberOfBackSlashChar % 2 == 0;
069        }
070      }
071    }