Java String Unescape unescape(String text)

Description

Unescapes the String text according to the format described above in escape(String text)

License

Open Source License

Parameter

Parameter	Description
text	The String to escape. If the String is null, then we return null.

Return

The unescaped version of the input string. If the string is null, return null

Declaration

static String unescape(String text) 

Method Source Code

//package com.java2s;
/*/*from w ww. jav a2  s  . c  om*/
 * Copyright (c) 2008, SQL Power Group Inc.
 *
 * This file is part of SQL Power Library.
 *
 * SQL Power Library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * SQL Power Library is 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 */

public class Main {
    /**
     * Unescapes the String text according to the format described above in escape(String text)
     * 
     * @param text The String to escape. If the String is null, then we return null.
     * @return The unescaped version of the input string. If the string is null, return null
     */
    static String unescape(String text) {
        if (text == null)
            return null;

        StringBuilder unescapedText = new StringBuilder(text.length());

        for (int i = 0, n = text.length(); i < n;) {
            char ch = text.charAt(i);
            char nextch;
            if (i == n - 1) {
                nextch = 0;
            } else {
                nextch = text.charAt(i + 1);
            }

            if (ch == '\\' && nextch == 'u') {
                int charVal = Integer.parseInt(text.substring(i + 2, i + 6), 16);
                char unescapedChar = (char) charVal;
                unescapedText.append(unescapedChar);
                i += 6;
            } else {
                unescapedText.append(ch);
                i++;
            }
        }

        return unescapedText.toString();
    }
}

Related

1. unescape(String string)
2. unescape(String string, int escape)
3. unescape(String text)
4. unescape(String text)
5. unescape(String text)
6. unescape(String text)
7. unescape(String theValue)
8. unescape(String val)
9. unescape(String val, char quote)