Java Java String Unescape unescapeJava(final String s)

Description

unescape java strings well enough for our purposes.

License

Open Source License

Declaration

public static String unescapeJava(final String s) 

Method Source Code

//package com.java2s;
/**//from  w w w  .j av  a  2 s .  c  o  m
 * ADOBE SYSTEMS INCORPORATED
 * Copyright 2009-2013 Adobe Systems Incorporated
 * All Rights Reserved.
 *
 * NOTICE: Adobe permits you to use, modify, and distribute
 * this file in accordance with the terms of the MIT license,
 * a copy of which can be found in the LICENSE.txt file or at
 * http://opensource.org/licenses/MIT.
 */

public class Main {
    /**
     * unescape java strings well enough for our purposes.
     * Note: rather than throwing, we pass invalid
     * unicode sequences escaped through to the result.
     */
    public static String unescapeJava(final String s) {
        final StringBuilder b = new StringBuilder();
        final int n = s.length();

        for (int i = 0; i < n;) {
            final char c = s.charAt(i++);

            if (c == '\\' && i < n) {
                final char e = s.charAt(i++);

                switch (e) {
                case 'u': {
                    if (i < n - 3) {
                        try {
                            b.append((char) Integer.parseInt(
                                    "" + s.charAt(i++) + s.charAt(i++) + s.charAt(i++) + s.charAt(i++), 16));

                            continue;
                        } catch (NumberFormatException nfe) {
                            i -= 4;
                        }
                    }

                    b.append("\\u");
                    break;
                }
                case '\\':
                    b.append('\\');
                    break;
                case '\'':
                    b.append('\'');
                    break;
                case '\"':
                    b.append('"');
                    break;
                case 'r':
                    b.append('\r');
                    break;
                case 'f':
                    b.append('\f');
                    break;
                case 't':
                    b.append('\t');
                    break;
                case 'n':
                    b.append('\n');
                    break;
                case 'b':
                    b.append('\b');
                    break;
                default:
                    b.append(c).append(e);
                    break;
                }
            } else {
                b.append(c);
            }
        }

        return b.toString();
    }
}

Related

1. unescapeJava(final String str)
2. unescapeJava(final String str)
3. unescapeJava(String escaped)
4. unescapeJava(String s)