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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!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * 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
 *
 * 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 GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 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
 * by the very same license.
 *
 * 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.command;

import java.util.ArrayList;
import java.util.List;

import net.sourceforge.plantuml.TitledDiagram;
import net.sourceforge.plantuml.regex.Matcher2;
import net.sourceforge.plantuml.regex.MyPattern;
import net.sourceforge.plantuml.regex.Pattern2;
import net.sourceforge.plantuml.style.NoStyleAvailableException;
import net.sourceforge.plantuml.text.StringLocated;
import net.sourceforge.plantuml.utils.BlocLines;

public class SkinLoader {

	public final static Pattern2 p1 = MyPattern
			.cmpile("^([\\w.]*(?:\\<\\<.*\\>\\>)?[\\w.]*)[%s]+(?:(\\{)|(.*))$|^\\}?$");

	final private List context = new ArrayList<>();
	final private TitledDiagram diagram;

	public SkinLoader(TitledDiagram diagram) {
		this.diagram = diagram;
	}

	private void push(String s) {
		context.add(s);
	}

	private void pop() {
		context.remove(context.size() - 1);
	}

	private String getFullParam() {
		final StringBuilder sb = new StringBuilder();
		for (String s : context) {
			sb.append(s);
		}
		return sb.toString();
	}

	public CommandExecutionResult execute(BlocLines lines, final String group1) {

		if (group1 != null) {
			this.push(group1);
		}

		try {

			lines = lines.subExtract(1, 1);
			lines = lines.trim().removeEmptyLines();

			for (StringLocated s : lines) {
				assert s.getString().length() > 0;

				if (s.getString().equals("}")) {
					this.pop();
					continue;
				}
				final Matcher2 m = p1.matcher(s.getString());
				if (m.find() == false) {
					throw new IllegalStateException();
				}
				if (m.group(2) != null) {
					this.push(m.group(1));
				} else if (m.group(3) != null) {
					final String key = this.getFullParam() + m.group(1);
					diagram.setParam(key, m.group(3));
				} else {
					throw new IllegalStateException("." + s.getString() + ".");
				}
			}
			return CommandExecutionResult.ok();
		} catch (NoStyleAvailableException e) {
			// Logme.error(e);
			return CommandExecutionResult.error("General failure: no style available.");
		}

	}

}