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/*
* SonarQube
* Copyright (C) 2009-2025 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program 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.
*
* This program 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 java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.sonar.channel.RegexChannel;
/**
* Markdown treats double backtick quote (``) as indicators of code. Text wrapped with two `` and that spans on multiple lines will be wrapped with
* an HTML {@literal <pre><code>} tag.
*
* E.g., the input:
* <pre>
* ``
* This code
* spans on 2 lines
* ``
* </pre>
* will produce:
* {@literal<pre>}{@literal<code>}This code
* spans on 2 lines{@literal</code>}{@literal</pre>}
*
* @since 2.14
*/
class HtmlMultilineCodeChannel extends RegexChannel<MarkdownOutput> {
private static final String NEWLINE = "(?:\\n\\r|\\r|\\n)";
private static final String LANGUAGE = "([a-zA-Z][a-zA-Z0-9_]*+)?";
private static final String DETECTION_REGEXP = "``" + LANGUAGE + NEWLINE + "([\\s\\S]+?)" + NEWLINE + "``";
private final Matcher regexpMatcher;
public HtmlMultilineCodeChannel() {
super(DETECTION_REGEXP);
regexpMatcher = Pattern.compile(DETECTION_REGEXP).matcher("");
}
@Override
protected void consume(CharSequence token, MarkdownOutput output) {
regexpMatcher.reset(token);
regexpMatcher.matches();
output.append("<pre");
String language = regexpMatcher.group(1);
if (language != null) {
output.append(" lang=\"");
output.append(language);
output.append("\"");
}
output.append("><code>");
output.append(regexpMatcher.group(2));
output.append("</code></pre>");
}
}
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