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
021package org.sonar.squid.text;
022
023public class SingleLineCommentHandler extends LineContextHandler {
024
025  private StringBuilder comment;
026
027  private final String commentStartTag;
028  private final String commentNotStartTag;
029
030  public SingleLineCommentHandler(String commentStartTag) {
031    this(commentStartTag, null);
032  }
033
034  public SingleLineCommentHandler(String commentStartTag, String commentNotStartTag) {
035    this.commentStartTag = commentStartTag;
036    this.commentNotStartTag = commentNotStartTag;
037  }
038
039  @Override
040  boolean matchToEnd(Line line, StringBuilder pendingLine) {
041    if (comment == null) {
042      throw new IllegalStateException("Method doContextBegin(StringBuilder pendingLine) has not been called.");
043    }
044    comment.append(getLastCharacter(pendingLine));
045    return false;
046  }
047
048  @Override
049  boolean matchToBegin(Line line, StringBuilder pendingLine) {
050    boolean doContextBegin = matchEndOfString(pendingLine, commentStartTag)
051        && (commentNotStartTag == null || !matchEndOfString(pendingLine, commentNotStartTag));
052    if (doContextBegin) {
053      comment = new StringBuilder(commentStartTag);
054    }
055    return doContextBegin;
056  }
057
058  @Override
059  boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
060    line.setComment(comment.toString());
061    comment = null;
062    return true;
063  }
064}