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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 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.text;

import java.util.StringTokenizer;
import java.util.regex.Matcher;

public class Guillemet {

	public static final Guillemet NONE = new Guillemet("", "");
	public static final Guillemet DOUBLE_COMPARATOR = new Guillemet("<<", ">>");
	public static final Guillemet GUILLEMET = new Guillemet("\u00AB", "\u00BB");

	private final String start;
	private final String end;

	public Guillemet fromDescription(String value) {
		if (value != null) {
			if ("false".equalsIgnoreCase(value)) {
				return Guillemet.DOUBLE_COMPARATOR;
			}
			if ("<< >>".equalsIgnoreCase(value)) {
				return Guillemet.DOUBLE_COMPARATOR;
			}
			if ("none".equalsIgnoreCase(value)) {
				return Guillemet.NONE;
			}
			if (value.contains(" ")) {
				final StringTokenizer st = new StringTokenizer(value, " ");
				return new Guillemet(st.nextToken(), st.nextToken());
			}
		}
		return Guillemet.GUILLEMET;
	}

	private Guillemet(String start, String end) {
		this.start = start;
		this.end = end;

	}

	public String manageGuillemet(String st) {
		if (this == DOUBLE_COMPARATOR) {
			return st;
		}
		return st.replaceAll("\\<\\<\\s?((?:\\<&\\w+\\>|[^<>])+?)\\s?\\>\\>",
				Matcher.quoteReplacement(start) + "$1" + Matcher.quoteReplacement(end));
	}

	public String manageGuillemetStrict(String st) {
		if (this == DOUBLE_COMPARATOR) {
			return st;
		}
		if (st.startsWith("<< ")) {
			st = start + st.substring(3);
		} else if (st.startsWith("<<")) {
			st = start + st.substring(2);
		}
		if (st.endsWith(" >>")) {
			st = st.substring(0, st.length() - 3) + end;
		} else if (st.endsWith(">>")) {
			st = st.substring(0, st.length() - 2) + end;
		}
		return st;
	}

}