/*******************************************************************************
* Copyright (c) 2015 David Green.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* David Green - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.wikitext.commonmark.internal.blocks;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.mylyn.wikitext.commonmark.internal.Line;
import org.eclipse.mylyn.wikitext.commonmark.internal.LineSequence;
public class HtmlCommentBlock extends AbstractHtmlBlock {
private final Pattern startPattern = Pattern.compile("\\s{0,3}(<!--)(?!>|->).*");
private final Pattern doubleHyphen = Pattern.compile("--(?!>)");
private final Pattern closePattern = Pattern.compile("(?<!-)-->");
@Override
public boolean canStart(LineSequence lineSequence) {
Line line = lineSequence.getCurrentLine();
if (line != null) {
String text = line.getText();
Matcher matcher = startPattern().matcher(text);
if (matcher.matches()) {
int end = matcher.end(1);
if (end < text.length() - 1) {
Matcher doubleHyphenMatcher = doubleHyphen.matcher(text);
doubleHyphenMatcher.region(end, text.length());
if (doubleHyphenMatcher.find()) {
return false;
}
}
return true;
}
}
return false;
}
@Override
protected Pattern closePattern() {
return closePattern;
}
@Override
protected Pattern startPattern() {
return startPattern;
}
}