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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.text;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import net.sourceforge.plantuml.StringUtils;

public class BackSlash {

	public static final String BS_BS_N = "\\n";
	public static final String NEWLINE = "\n";
	public static final char CHAR_NEWLINE = '\n';
	
	public static final String lineSeparator() {
		return System.lineSeparator();
	}

	public static char hiddenNewLine() {
		return StringUtils.PRIVATE_BLOCK + BackSlash.CHAR_NEWLINE;
	}

	public static String convertHiddenNewLine(String s) {
		s = s.replaceAll("(? splitHiddenNewLine(String s) {
		return Arrays.asList(s.split("" + hiddenNewLine()));
	}

	public static String manageNewLine(String string) {
		return string.replace(hiddenNewLine(), BackSlash.CHAR_NEWLINE);
	}

	public static List getWithNewlines(CharSequence s) {
		if (s == null) 
			return null;
		
		final List result = new ArrayList<>();
		final StringBuilder current = new StringBuilder();
		for (int i = 0; i < s.length(); i++) {
			final char c = s.charAt(i);
			if (c == '\\' && i < s.length() - 1) {
				final char c2 = s.charAt(i + 1);
				i++;
				if (c2 == 'n') {
					result.add(current.toString());
					current.setLength(0);
				} else if (c2 == 't') {
					current.append('\t');
				} else if (c2 == '\\') {
					current.append(c2);
				}
			} else {
				current.append(c);
			}
		}
		result.add(current.toString());
		return Collections.unmodifiableList(result);
	}

	public static String translateBackSlashes(CharSequence s) {
		if (s == null) 
			return null;
		
		// final String tmps = s.toString();
		// if (tmps.indexOf('\\') == -1) {
		// return tmps;
		// }
		final StringBuilder result = new StringBuilder();
		for (int i = 0; i < s.length(); i++) {
			final char c = s.charAt(i);
			if (c == '\\' && i < s.length() - 1 && isEnglishLetterOfBackSlash(s.charAt(i + 1))) {
				result.append('\\');
				result.append(translateChar(s.charAt(i + 1)));
				i++;
			} else {
				result.append(c);
			}
		}
		return result.toString();
	}

	private static boolean isEnglishLetterOfBackSlash(char c) {
		return c == 'n';
		// return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
	}

	public static String untranslateBackSlashes(CharSequence s) {
		if (s == null) 
			return null;
		
		final StringBuilder result = new StringBuilder();
		for (int i = 0; i < s.length(); i++) {
			char c = s.charAt(i);
			if (c > StringUtils.PRIVATE_BLOCK && c < '\uE07F') 
				c = (char) (c - StringUtils.PRIVATE_BLOCK);
			
			result.append(c);
		}
		return result.toString();
	}

	private static char translateChar(char c) {
		if (c > 128) 
			throw new IllegalArgumentException();
		
		return (char) (StringUtils.PRIVATE_BLOCK + c);
	}

}