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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram

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/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2013, Arnaud Roques
 *
 * Project Info:  http://plantuml.sourceforge.net
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * Original Author:  Arnaud Roques
 * 
 * Revision $Revision: 6396 $
 *
 */
package net.sourceforge.plantuml;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class UrlBuilder  {
	
	private static final String URL_PATTERN = "\\[\\[(\"[^\"]+\"|[^{} \\]\\[]*)(?: *\\{([^{}]+)\\})?(?: *([^\\]\\[]+))?\\]\\]";

	private final String topurl;
	private boolean strict;
	
	public UrlBuilder(String topurl, boolean strict) {
		this.topurl = topurl;
		this.strict = strict;
	}
	
	public Url getUrl(String s) {
		final Pattern p;
		if (strict) {
			p = Pattern.compile("(?i)^" + URL_PATTERN + "$");
		} else {
			p = Pattern.compile(".*" + URL_PATTERN + ".*");
		}
		final Matcher m = p.matcher(s.trim());
		if (m.matches() == false) {
			return null;
		}
		String url = StringUtils.eventuallyRemoveStartingAndEndingDoubleQuote(m.group(1));
		if (url.startsWith("http:") == false && url.startsWith("https:") == false) {
			// final String top = getSystem().getSkinParam().getValue("topurl");
			if (topurl != null) {
				url = topurl + url;
			}
		}
		return new Url(url, m.group(2), m.group(3));
	}
	
	public static String getRegexp() {
		return URL_PATTERN;
	}

	public static String purgeUrl(final String label) {
		final Pattern p = Pattern.compile("(?: )*" + URL_PATTERN + "(?: )*");
		final Matcher m = p.matcher(label);
		if (m.find() == false) {
			throw new IllegalStateException();
		}
		final String url = m.group(0);
		final int x = label.indexOf(url);
		return label.substring(0, x) + label.substring(x + url.length());
	}


}