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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.utils;

public class CharHidder {
	// ::remove file when __HAXE__

	public static String addTileAtBegin(String s) {
		return "~" + s;
	}

	public static String hide(String s) {
		// System.err.println("hide " + s);
		final StringBuilder result = new StringBuilder();
		for (int i = 0; i < s.length(); i++) {
			final char c = s.charAt(i);
			if (c == '\\' && i + 1 < s.length() && s.charAt(i + 1) == '~') {
				result.append(hideChar('~'));
				i++;
			} else if (c == '~' && i + 1 < s.length()) {
				i++;
				final char c2 = s.charAt(i);
				if (isToBeHidden(c2)) {
					result.append(hideChar(c2));
				} else {
					result.append(c);
					result.append(c2);
				}

			} else {
				result.append(c);
			}
		}
		// System.err.println("---> " + result);
		return result.toString();
	}

	private static boolean isToBeHidden(final char c) {
		if (c == '_' || c == '-' || c == '\"' || c == '#' || c == ']' || c == '[' || c == '*' || c == '.' || c == '/'
				|| c == '<') {
			return true;
		}
		return false;
	}

	private static char hideChar(char c) {
		if (c > 255) {
			throw new IllegalArgumentException();
		}
		return (char) ('\uE000' + c);
	}

	private static char unhideChar(char c) {
		if (c >= '\uE000' && c <= '\uE0FF') {
			return (char) (c - '\uE000');
		}
		return c;
	}

	public static String unhide(String s) {
		final StringBuilder result = new StringBuilder();
		for (int i = 0; i < s.length(); i++) {
			final char c = s.charAt(i);
			result.append(unhideChar(c));
		}
		// System.err.println("unhide " + result);
		return result.toString();
	}

}