Java String Unescape unescape(String text)

Description

unescape

License

Open Source License

Declaration

public static String unescape(String text) 

Method Source Code

//package com.java2s;
/*//  ww  w.  j a  v  a  2 s.c  om
 * (c) Copyright 2007-2012 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

public class Main {
    /** Bell character (BEL, 0x07) */
    public static final String BEL = String.valueOf((char) 7);
    /** Backspace character (BS, 0x08) */
    public static final String BS = String.valueOf((char) 8);
    /** Horizontal Tab character (HT, 0x09) */
    public static final String HT = String.valueOf('\t');
    /** Line Feed character (LF, 0x0A) */
    public static final String LF = String.valueOf('\n');
    /**  character (FF, 0x0C) */
    public static final String FF = String.valueOf('\f');
    /**  character (CR, 0x0D) */
    public static final String CR = String.valueOf('\r');

    /**
     * @see "http://en.wikipedia.org/wiki/ASCII"
     */
    public static String unescape(String text) {
        if (text == null)
            return null;
        StringBuilder builder = new StringBuilder(text.length());
        for (int i = 0; i < text.length(); i++) {
            char c = text.charAt(i);
            if (c != '\\')
                builder.append(c);
            else if (i < text.length() - 1) {
                c = text.charAt(++i);
                switch (c) {
                case '\'':
                    builder.append('\'');
                    break;
                case '"':
                    builder.append('"');
                    break;
                case '{':
                    builder.append('{');
                    break;
                case '}':
                    builder.append('}');
                    break;
                case 'a':
                    builder.append(BEL);
                    break;
                case 'b':
                    builder.append(BS);
                    break;
                case 'r':
                    builder.append(CR);
                    break;
                case 'n':
                    builder.append(LF);
                    break;
                case 't':
                    builder.append(HT);
                    break;
                case 'f':
                    builder.append(FF);
                    break;
                case 'u':
                    long n = Long.parseLong(text.substring(i + 1, i + 5), 16);
                    builder.append((char) n);
                    i += 4;
                    break;
                default:
                    builder.append(c);
                    break;
                }
            } else
                builder.append('\\');
        }
        return builder.toString();
    }
}

Related

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