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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 Eclipse Public License.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [Eclipse Public License - v 1.0]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * http://www.eclipse.org/legal/epl-v10.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 EPL license.
 *
 * The generated images can then be used without any reference to the EPL 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 net.sourceforge.plantuml.Scale;
import net.sourceforge.plantuml.ScaleSimple;
import net.sourceforge.plantuml.style.ISkinParam;
import net.sourceforge.plantuml.style.Style;
import net.sourceforge.plantuml.style.StyleBuilder;
import net.sourceforge.plantuml.style.parser.StyleParser;
import net.sourceforge.plantuml.style.parser.StyleParsingException;
import net.sourceforge.plantuml.text.StringLocated;
import net.sourceforge.plantuml.utils.BlocLines;

public class StyleExtractor {

	private final List list = new ArrayList<>();
	private final List style = new ArrayList<>();
	private String title = null;
	private boolean handwritten = false;
	private String scale = null;

	public StyleExtractor(Iterator data) {
		while (data.hasNext()) {
			StringLocated line = data.next();
			final String s = line.getString().trim();
			if (s.length() == 0)
				continue;
			if (startStyle(s)) {
				while (data.hasNext()) {
					style.add(line);
					if (endStyle(line))
						break;
					line = data.next();
				}
			} else if (list.size() >= 1 && s.startsWith("!assume ")) {
				// Ignore
			} else if (list.size() >= 1 && s.startsWith("!pragma ")) {
				// Ignore
			} else if (list.size() >= 1 && s.startsWith("hide ")) {
				// Ignore
			} else if (list.size() >= 1 && s.startsWith("scale ")) {
				// Ignore
				this.scale = s;
			} else if (list.size() >= 1 && s.startsWith("title ")) {
				this.title = s.substring("title ".length()).trim();
			} else if (list.size() >= 1 && s.startsWith("skinparam ")) {
				if (s.contains("handwritten") && s.contains("true"))
					handwritten = true;
				if (s.contains("{")) {
					while (data.hasNext()) {
						if (line.getString().trim().equals("}"))
							break;
						line = data.next();
					}
				}
			} else {
				list.add(line.getString());
			}
		}

	}

	private boolean startStyle(String line) {
		return line.equals("");
	}

	public void applyStyles(ISkinParam skinParam) throws StyleParsingException {
		if (style.size() > 0) {
			final StyleBuilder styleBuilder = skinParam.getCurrentStyleBuilder();
			final BlocLines blocLines = BlocLines.from(style);
			for (Style modifiedStyle : StyleParser.parse(blocLines, styleBuilder))
				skinParam.muteStyle(modifiedStyle);
		}
	}

	public Iterator getIterator() {
		return list.iterator();
	}

	public String getTitle() {
		return title;
	}

	public final boolean isHandwritten() {
		return handwritten;
	}

	public String getScale() {
		return scale;
	}

}