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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
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 *
 *
 * PlantUML 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.
 *
 * 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
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 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
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 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.url;

import net.sourceforge.plantuml.regex.IRegex;
import net.sourceforge.plantuml.regex.Matcher2;
import net.sourceforge.plantuml.regex.MyPattern;
import net.sourceforge.plantuml.regex.Pattern2;
import net.sourceforge.plantuml.regex.RegexLeaf;
import net.sourceforge.plantuml.regex.RegexOptional;

public class UrlBuilder {
    // ::remove file when __HAXE__

	public static final IRegex MANDATORY = new RegexLeaf("URL", "(" + UrlBuilder.getRegexp() + ")");
	public static final IRegex OPTIONAL = new RegexOptional(MANDATORY);

	private static final String START_PART = "\\[\\[[%s]*";
	private static final String END_PART = "[%s]*\\]\\]";

	private static final String S_QUOTED = START_PART + //
			"[%g]([^%g]+)[%g]" + // Quoted part
			"(?:[%s]*\\{([^{}]*)\\})?" + // Optional tooltip
			"(?:[%s]([^%s\\{\\}\\[\\]][^\\[\\]]*))?" + // Optional label
			END_PART;

	private static final String S_ONLY_TOOLTIP = START_PART + //
			"\\{(.*)\\}" + // Tooltip
			END_PART;

	private static final String S_ONLY_TOOLTIP_AND_LABEL = START_PART + //
			"\\{([^{}]*)\\}" + // Tooltip
			"[%s]*" + //
			"([^\\[%s\\{\\}\\[\\]][^\\[\\]]*)" // Label
			+ END_PART;

	private static final String S_LINK_TOOLTIP_NOLABEL = START_PART + //
			"([^\\s%g{}\\[\\]]+?)" + // Link
			"[%s]*" + //
			"\\{(.+)\\}" + // Tooltip
			END_PART;

	private static final String S_LINK_WITH_OPTIONAL_TOOLTIP_WITH_OPTIONAL_LABEL = START_PART + //
			"([^%s%g\\[\\]]+?)" + // Link
			"(?:[%s]*\\{([^{}]*)\\})?" + // Optional tooltip
			"(?:[%s]([^%s\\{\\}\\[\\]][^\\[\\]]*))?" + // Optional label
			END_PART;

	public static String getRegexp() {
		return S_QUOTED + "|" + //
				S_ONLY_TOOLTIP + "|" + //
				S_ONLY_TOOLTIP_AND_LABEL + "|" + //
				S_LINK_TOOLTIP_NOLABEL + "|" + //
				S_LINK_WITH_OPTIONAL_TOOLTIP_WITH_OPTIONAL_LABEL;
	}

	private static final Pattern2 QUOTED = MyPattern.cmpile(S_QUOTED);
	private static final Pattern2 ONLY_TOOLTIP = MyPattern.cmpile(S_ONLY_TOOLTIP);
	private static final Pattern2 ONLY_TOOLTIP_AND_LABEL = MyPattern.cmpile(S_ONLY_TOOLTIP_AND_LABEL);
	private static final Pattern2 LINK_TOOLTIP_NOLABEL = MyPattern.cmpile(S_LINK_TOOLTIP_NOLABEL);
	private static final Pattern2 LINK_WITH_OPTIONAL_TOOLTIP_WITH_OPTIONAL_LABEL = MyPattern
			.cmpile(S_LINK_WITH_OPTIONAL_TOOLTIP_WITH_OPTIONAL_LABEL);

	private final String topurl;
	private UrlMode mode;

	public UrlBuilder(String topurl, UrlMode mode) {
		this.topurl = topurl;
		this.mode = mode;
	}

	public Url getUrl(String s) {
		Matcher2 m;
		m = QUOTED.matcher(s);
		if (matchesOrFind(m))
			return new Url(withTopUrl(m.group(1)), m.group(2), m.group(3));

		m = ONLY_TOOLTIP.matcher(s);
		if (matchesOrFind(m))
			return new Url("", m.group(1), null);

		m = ONLY_TOOLTIP_AND_LABEL.matcher(s);
		if (matchesOrFind(m))
			return new Url("", m.group(1), m.group(2));

		m = LINK_TOOLTIP_NOLABEL.matcher(s);
		if (matchesOrFind(m))
			return new Url(withTopUrl(m.group(1)), m.group(2), null);

		m = LINK_WITH_OPTIONAL_TOOLTIP_WITH_OPTIONAL_LABEL.matcher(s);
		if (matchesOrFind(m))
			return new Url(withTopUrl(m.group(1)), m.group(2), m.group(3));

		return null;

	}

	private boolean matchesOrFind(Matcher2 m) {
		if (mode == UrlMode.STRICT)
			return m.matches();
		else if (mode == UrlMode.ANYWHERE)
			return m.find();
		else
			throw new IllegalStateException();

	}

	private String withTopUrl(String url) {
		if (url.startsWith("http:") == false && url.startsWith("https:") == false && url.startsWith("file:") == false
				&& topurl != null)
			return topurl + url;

		return url;
	}

}