Java String Unescape unescape(String s)

Description

Removes escaping from an RFC 5545 "text".

License

Apache License

Declaration

public static String unescape(String s) 

Method Source Code

//package com.java2s;
/*/*from w w w . ja  v a  2  s. c o  m*/
 * Copyright (C) 2010 The Android Open Source Project
 * 
 * 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.
 */

public class Main {
    /**
     * Removes escaping from an RFC 5545 "text".
     * 
     *        ESCAPED-CHAR = ("\\" / "\;" / "\," / "\N" / "\n")
     *        ; \\ encodes \
     *        ; \N or \n encodes newline
     *        ; \; encodes ;
     *        ; \, encodes ,
     */
    public static String unescape(String s) {
        if (s.indexOf('\\') == -1) {
            return s;
        }
        StringBuilder result = new StringBuilder();
        for (int i = 0; i < s.length(); ++i) {
            char ch = s.charAt(i);
            if (ch == '\\' && i < s.length() - 1) {
                char ch2 = s.charAt(++i);
                if (ch2 == 'n' || ch2 == 'N') {
                    ch2 = '\n';
                }
                result.append(ch2);
            } else {
                result.append(ch);
            }
        }
        return result.toString();
    }
}

Related

1. unescape(String s)
2. unescape(String s)
3. unescape(String s)
4. unescape(String s)
5. unescape(String s)
6. unescape(String s)
7. unescape(String s)
8. unescape(String s, char[] charsToEscape)
9. unescape(String s, int i)