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/*
 * SonarQube, open source software quality management tool.
 * Copyright (C) 2008-2013 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * SonarQube is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * SonarQube is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package org.sonar.squid.text;

public class LiteralValueHandler extends LineContextHandler {

  private final char delimiter;

  public LiteralValueHandler(char delimiter) {
    this.delimiter = delimiter;
  }

  @Override
  boolean matchToEnd(Line line, StringBuilder pendingLine) {
    return matchEndOfString(pendingLine, delimiter) && evenNumberOfBackSlashBeforeDelimiter(pendingLine);
  }

  private boolean evenNumberOfBackSlashBeforeDelimiter(StringBuilder pendingLine) {
    int numberOfBackSlashChar = 0;
    for (int index = pendingLine.length() - 2; index >= 0; index--) {
      if (pendingLine.charAt(index) == '\\') {
        numberOfBackSlashChar++;
      } else {
        break;
      }
    }
    return numberOfBackSlashChar % 2 == 0;
  }

  @Override
  boolean matchToBegin(Line line, StringBuilder pendingLine) {
    if (matchEndOfString(pendingLine, delimiter)) {
      return true;
    }
    return false;
  }

  @Override
  boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
    //see http://jira.codehaus.org/browse/SONAR-1555
    return true;
  }
}




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