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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:
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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 .
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 * 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.
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 * 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.
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 * 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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 * 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
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 * 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.activitydiagram3.command;

import java.util.regex.Matcher;

import net.sourceforge.plantuml.activitydiagram3.ActivityDiagram3;
import net.sourceforge.plantuml.activitydiagram3.ftile.BoxStyle;
import net.sourceforge.plantuml.command.CommandExecutionResult;
import net.sourceforge.plantuml.command.SingleLineCommand2;
import net.sourceforge.plantuml.klimt.color.ColorParser;
import net.sourceforge.plantuml.klimt.color.ColorType;
import net.sourceforge.plantuml.klimt.color.Colors;
import net.sourceforge.plantuml.klimt.color.NoSuchColorException;
import net.sourceforge.plantuml.klimt.creole.Display;
import net.sourceforge.plantuml.regex.IRegex;
import net.sourceforge.plantuml.regex.RegexConcat;
import net.sourceforge.plantuml.regex.RegexLeaf;
import net.sourceforge.plantuml.regex.RegexResult;
import net.sourceforge.plantuml.skin.ColorParam;
import net.sourceforge.plantuml.stereo.Stereotype;
import net.sourceforge.plantuml.stereo.StereotypePattern;
import net.sourceforge.plantuml.url.Url;
import net.sourceforge.plantuml.url.UrlBuilder;
import net.sourceforge.plantuml.url.UrlMode;
import net.sourceforge.plantuml.utils.LineLocation;

public class CommandActivity3 extends SingleLineCommand2 {

	public static final String endingGroup() {
		return "(" //
				+ ";[%s]*(\\<\\<\\w+\\>\\>(?:[%s]*\\<\\<\\w+\\>\\>)*)?" //
				+ "|" //
				+ Matcher.quoteReplacement("\\\\") // that is simply \ character
				+ "|" //
				+ "(?]{1,999})(?)\\>" // About >
				+ "|" //
				+ "(?\\>(?:[%s]*\\<\\<\\w+\\>\\>)*)?" //
				+ "|" //
				+ Matcher.quoteReplacement("\\\\") // that is simply \ character
				+ "|" //
				+ "(?]{1,999})(?)\\>" // About >
				+ "|" //
				+ "\\|" // About |
				+ ")";
	}

	public static void main(String[] args) {
		System.err.println(Matcher.quoteReplacement("\\\\"));
		System.err.println(Matcher.quoteReplacement("\\\\").equals("\\\\\\\\"));
	}

	public CommandActivity3() {
		super(getRegexConcat());
	}

	static IRegex getRegexConcat() {
		return RegexConcat.build(CommandActivity3.class.getName(), RegexLeaf.start(), //
				UrlBuilder.OPTIONAL, //
				color().getRegex(), //
				StereotypePattern.optional("STEREO"), //
				new RegexLeaf(":"), //
				new RegexLeaf("LABEL", "(.*?)"), //
				new RegexLeaf("STYLE", endingGroupShort()), //
				RegexLeaf.end());
	}

	private static ColorParser color() {
		return ColorParser.simpleColor(ColorType.BACK);
	}

	@Override
	protected CommandExecutionResult executeArg(ActivityDiagram3 diagram, LineLocation location, RegexResult arg)
			throws NoSuchColorException {

		final Url url;
		if (arg.get("URL", 0) == null) {
			url = null;
		} else {
			final UrlBuilder urlBuilder = new UrlBuilder(diagram.getSkinParam().getValue("topurl"), UrlMode.STRICT);
			url = urlBuilder.getUrl(arg.get("URL", 0));
		}

		Colors colors = color().getColor(arg, diagram.getSkinParam().getIHtmlColorSet());
		String stereo = arg.get("STEREO", 0);
		if (stereo == null)
			stereo = arg.get("STYLE", 1);

		Stereotype stereotype = null;
		if (stereo != null) {
			stereotype = Stereotype.build(stereo);
			colors = colors.applyStereotype(stereotype, diagram.getSkinParam(), ColorParam.activityBackground);
		}
		BoxStyle style = BoxStyle.fromString(arg.get("STEREO", 0));
		if (style == BoxStyle.PLAIN)
			style = BoxStyle.fromString(arg.get("STYLE", 0));

		final Display display = Display.getWithNewlines2(arg.get("LABEL", 0));
		return diagram.addActivity(display, style, url, colors, stereotype);
	}

}