org.eclipse.osbp.xtext.i18n/src/org/eclipse/osbp/xtext/i18n/I18NKeyGenerator.java

/**
 *                                                                            
 * Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *                                                                            
 * All rights reserved. This program and the accompanying materials           
 * are made available under the terms of the Eclipse Public License 2.0        
 * which accompanies this distribution, and is available at                  
 * https://www.eclipse.org/legal/epl-2.0/                                 
 *                                 
 * SPDX-License-Identifier: EPL-2.0                                 
 *                                                                            
 * Contributors:   
 * Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation 
 */
package org.eclipse.osbp.xtext.i18n;

public class I18NKeyGenerator {
	public static String key(String input) {
		if (input != null) {
			return value(input).replaceAll("(\\W)" ,"_").toLowerCase();
		}
		return null;
	}

	/**
	 * @see {@link #camelCaseToUnderscore(String)}
	 * @see {@link CamelCaseToLowerCaseWithUnderscoreTest}
	 * @param  input
	 * @return any ", [, ] and ^ are removed. Camel case is converted into lower case with underscore
	 */
	public static String value(String input) {
		if (input != null) {
			// 2. convert camel case to lowercase with underscores
			return camelCaseToUnderscore(
				// 1. remove any ", [, ] and ^
				input.replace("\"","").replace("[","").replace("]","").replace("^","")
			);
		}
		return null;
	}
	
	public static String toGetter(String input) {
		String k = key(input);
		return "get"+k.substring(0, 1).toUpperCase()+k.substring(1);
	}
	
	/**
	 * @see {@link CamelCaseToLowerCaseWithUnderscoreTest}
	 * @param  pCamelCaseString
	 * @return camel case is converted into lower case with underscore
	 */
	public static String camelCaseToUnderscore(String pCamelCaseString) {
		return
			// 1. replace any non digit and letters to underscore
			pCamelCaseString.replaceAll("(\\W)" ,"_").
			// 2. convert lower case to upper case
			replaceAll("([a-z])([A-Z])", "$1_$2").
			// 3. remove any double underscores that may be generated
			replace("__", "_").
			// 4. to lower case now
			toLowerCase()
			;
	}

}