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/*
 * SonarQube, open source software quality management tool.
 * Copyright (C) 2008-2014 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.markdown;

import org.sonar.channel.RegexChannel;

/**
 * Headings are triggered by equal signs at the beginning of a line. The depth of the heading is determined by the number
 * of equal signs (up to 6).
 *
 * E.g., the input:
 *  * = Level 1
 * == Level 2
 * === Level 3
 * ==== Level 4
 * ===== Level 5
 * ====== Level 6
 * 
 * will produce:
 *  * {@literal}Level 1{@literal}
 * {@literal}Level 2{@literal}
 * {@literal}Level 3{@literal}
 * {@literal}Level 4{@literal}
 * {@literal}Level 5{@literal}
 * {@literal}Level 6{@literal}
 * 
 * @since 4.4
 *
 */
public class HtmlHeadingChannel extends RegexChannel {

  private static final int MAX_HEADING_DEPTH = 6;

  public HtmlHeadingChannel() {
    super("\\s*=+\\s[^\r\n]*+[\r\n]*");
  }

  @Override
  protected void consume(CharSequence token, MarkdownOutput output) {
    int index = 0;
    int headingLevel = 0;
    while(index < token.length() && Character.isWhitespace(token.charAt(index))) {
      index ++;
    }
    while(index < token.length() && index <= MAX_HEADING_DEPTH && token.charAt(index) == '=') {
      index ++;
      headingLevel ++;
    }
    while(index < token.length() && Character.isWhitespace(token.charAt(index))) {
      index ++;
    }
    CharSequence headingText = token.subSequence(index, token.length());

    output.append("");
    output.append(headingText);
    output.append("");
  }
}