org.springframework.web.util.JavaScriptUtils Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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
*
* https://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 abstract 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) {
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();
}
}