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;
021    
022    public class LiteralValueHandler extends LineContextHandler {
023    
024      private final char delimiter;
025    
026      public LiteralValueHandler(char delimiter) {
027        this.delimiter = delimiter;
028      }
029    
030      @Override
031      boolean matchToEnd(Line line, StringBuilder pendingLine) {
032        if (matchEndOfString(pendingLine, delimiter) && evenNumberOfBackSlashBeforeDelimiter(pendingLine)) {
033          return true;
034        }
035        return false;
036      }
037    
038      private boolean evenNumberOfBackSlashBeforeDelimiter(StringBuilder pendingLine) {
039        int numberOfBackSlashChar = 0;
040        for (int index = pendingLine.length() - 2; index >= 0; index--) {
041          if (pendingLine.charAt(index) == '\\') {
042            numberOfBackSlashChar++;
043          } else {
044            break;
045          }
046        }
047        return numberOfBackSlashChar % 2 == 0;
048      }
049    
050      @Override
051      boolean matchToBegin(Line line, StringBuilder pendingLine) {
052        if (matchEndOfString(pendingLine, delimiter)) {
053          return true;
054        }
055        return false;
056      }
057    
058      @Override
059      boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
060        throw new IllegalStateException("String should have been ended before the end of line. line = '" + pendingLine + "'");
061      }
062    }