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.squid.text.colorizer;
021    
022    import org.sonar.squid.text.CodeReader;
023    import org.sonar.squid.text.EndTokenMatcher;
024    
025    public class StringTokenizer extends Tokenizer {
026    
027      public StringTokenizer(String tagBefore, String tagAfter) {
028        super(tagBefore, tagAfter);
029      }
030    
031      public StringTokenizer() {
032        super("", "");
033      }
034    
035      @Override
036      public boolean hasNextToken(CodeReader code) {
037        return code.peek() == '\'' || code.peek() == '\"';
038      }
039    
040      @Override
041      public String nextToken(CodeReader code) {
042        int firstChar = code.peek();
043        String comment = code.readTo(new EndCommentMatcher(firstChar, code));
044        return tagBefore + comment + tagAfter;
045      }
046    
047      private class EndCommentMatcher implements EndTokenMatcher {
048    
049        private final int        firstChar;
050        private final CodeReader code;
051        private int              stringLength = 0;
052    
053        public EndCommentMatcher(int firstChar, CodeReader code) {
054          this.firstChar = firstChar;
055          this.code = code;
056        }
057    
058        public boolean match(int endFlag) {
059          return (code.lastChar() == firstChar && code.lastChar(2) != '\\' && ++stringLength > 1);
060        }
061      }
062    }