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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 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
 *
 * 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
 * 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.jsondiagram;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.sourceforge.plantuml.abel.DisplayPositioned;
import net.sourceforge.plantuml.command.PSystemAbstractFactory;
import net.sourceforge.plantuml.core.Diagram;
import net.sourceforge.plantuml.core.DiagramType;
import net.sourceforge.plantuml.core.UmlSource;
import net.sourceforge.plantuml.json.Json;
import net.sourceforge.plantuml.json.JsonValue;
import net.sourceforge.plantuml.json.ParseException;
import net.sourceforge.plantuml.klimt.creole.Display;
import net.sourceforge.plantuml.klimt.geom.HorizontalAlignment;
import net.sourceforge.plantuml.klimt.geom.VerticalAlignment;
import net.sourceforge.plantuml.log.Logme;
import net.sourceforge.plantuml.skin.UmlDiagramType;
import net.sourceforge.plantuml.style.parser.StyleParsingException;
import net.sourceforge.plantuml.text.BackSlash;
import net.sourceforge.plantuml.yaml.Highlighted;

public class JsonDiagramFactory extends PSystemAbstractFactory {

	public JsonDiagramFactory() {
		super(DiagramType.JSON);
	}

	@Override
	public Diagram createSystem(UmlSource source, Map skinParam) {
		final List highlighted = new ArrayList<>();
		StyleExtractor styleExtractor = null;
		JsonValue json;
		try {
			final StringBuilder sb = new StringBuilder();
			styleExtractor = new StyleExtractor(source.iterator2());
			final Iterator it = styleExtractor.getIterator();
			it.next();
			while (true) {
				final String line = it.next();
				if (it.hasNext() == false)
					break;

				if (line.startsWith("#")) {
					if (Highlighted.matchesDefinition(line)) {
						highlighted.add(Highlighted.build(line));
						continue;
					}
				} else {
					sb.append(line);
					sb.append(BackSlash.CHAR_NEWLINE);
				}
			}
			json = Json.parse(sb.toString());
		} catch (ParseException e) {
			json = null;
		}
		final JsonDiagram result = new JsonDiagram(source, UmlDiagramType.JSON, json, highlighted, styleExtractor);
		if (styleExtractor != null) {
			try {
				styleExtractor.applyStyles(result.getSkinParam());
			} catch (StyleParsingException e) {
				Logme.error(e);
			}
			final String title = styleExtractor.getTitle();
			if (title != null)
				result.setTitle(DisplayPositioned.single(Display.getWithNewlines(title), HorizontalAlignment.CENTER,
						VerticalAlignment.CENTER));
		}
		return result;
	}

}