Java String Unescape unescape(String s)

Description

Unescape \n, \r, \t, and \0xxx unicode escapes

License

Open Source License

Declaration

public static String unescape(String s) 

Method Source Code

//package com.java2s;
/********************************************************************
Copyright (c) 2000-2008 Steven E. Hugg./*www  . jav  a2 s  .  co m*/
    
This file is part of FLCore.
    
FLCore is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
FLCore 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 Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public License
along with FLCore.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/

public class Main {
    /**
      * Unescape \n, \r, \t, and \0xxx unicode escapes
      */
    public static String unescape(String s) {
        int l = s.length();
        StringBuffer dest = null;
        int i = 0;
        while (i < l - 1) {
            char c = s.charAt(i);
            if (c == '\\') {
                if (dest == null) {
                    dest = new StringBuffer(l);
                    dest.append(s.substring(0, i));
                }
                i++;
                c = s.charAt(i);
                switch (c) {
                case 'n':
                    dest.append('\n');
                    break;
                case 'r':
                    dest.append('\r');
                    break;
                case 't':
                    dest.append('\t');
                    break;
                case '*':
                    break;
                case '0':
                    i++;
                    int starti = i;
                    while (i < l && Character.isDigit(s.charAt(i)))
                        i++;
                    int octint = Integer.parseInt(s.substring(starti, i));
                    dest.append((char) octint);
                    i--;
                    break;
                default:
                    dest.append(c);
                    break;
                }
            } else {
                if (dest != null)
                    dest.append(c);
            }
            i++;
        }
        if (dest != null)
            while (i < l)
                dest.append(s.charAt(i++));
        if (dest != null)
            return dest.toString();
        else
            return s;
    }
}

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