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/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 */

package org.springframework.web.util;

/**
 * Utility class for JavaScript escaping.
 * Escapes based on the JavaScript 1.5 recommendation.
 *
 * 

Reference: * * JavaScript Guide on Mozilla Developer Network. * * @author Juergen Hoeller * @author Rob Harrop * @author Rossen Stoyanchev * @since 1.1.1 */ public class JavaScriptUtils { /** * Turn JavaScript special characters into escaped characters. * * @param input the input string * @return the string with escaped characters */ public static String javaScriptEscape(String input) { if (input == null) { return input; } StringBuilder filtered = new StringBuilder(input.length()); char prevChar = '\u0000'; char c; for (int i = 0; i < input.length(); i++) { c = input.charAt(i); if (c == '"') { filtered.append("\\\""); } else if (c == '\'') { filtered.append("\\'"); } else if (c == '\\') { filtered.append("\\\\"); } else if (c == '/') { filtered.append("\\/"); } else if (c == '\t') { filtered.append("\\t"); } else if (c == '\n') { if (prevChar != '\r') { filtered.append("\\n"); } } else if (c == '\r') { filtered.append("\\n"); } else if (c == '\f') { filtered.append("\\f"); } else if (c == '\b') { filtered.append("\\b"); } // No '\v' in Java, use octal value for VT ascii char else if (c == '\013') { filtered.append("\\v"); } else if (c == '<') { filtered.append("\\u003C"); } else if (c == '>') { filtered.append("\\u003E"); } // Unicode for PS (line terminator in ECMA-262) else if (c == '\u2028') { filtered.append("\\u2028"); } // Unicode for LS (line terminator in ECMA-262) else if (c == '\u2029') { filtered.append("\\u2029"); } else { filtered.append(c); } prevChar = c; } return filtered.toString(); } }





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