Java String Unquote unquote(String s)

Description

Unquote a string.

License

Open Source License

Parameter

Parameter	Description
s	The string to unquote.

Return

quoted string

Declaration

public static String unquote(String s) 

Method Source Code

//package com.java2s;
/*//from w w w .j a  v  a2s  .  co  m
 * The MIT License
 *
 * Copyright (c) 2010, InfraDNA, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

public class Main {
    /** Unquote a string.
     * @param s The string to unquote.
     * @return quoted string
     */
    public static String unquote(String s) {
        if (s == null) {
            return null;
        }
        if (s.length() < 2) {
            return s;
        }

        char first = s.charAt(0);
        char last = s.charAt(s.length() - 1);
        if (first != last || (first != '"' && first != '\'')) {
            return s;
        }

        StringBuilder b = new StringBuilder(s.length() - 2);
        boolean escape = false;
        for (int i = 1; i < s.length() - 1; i++) {
            char c = s.charAt(i);

            if (escape) {
                escape = false;
                switch (c) {
                case 'n':
                    b.append('\n');
                    break;
                case 'r':
                    b.append('\r');
                    break;
                case 't':
                    b.append('\t');
                    break;
                case 'f':
                    b.append('\f');
                    break;
                case 'b':
                    b.append('\b');
                    break;
                case 'u':
                    b.append((char) ((convertHexDigit((byte) s.charAt(i++)) << 24)
                            + (convertHexDigit((byte) s.charAt(i++)) << 16)
                            + (convertHexDigit((byte) s.charAt(i++)) << 8)
                            + (convertHexDigit((byte) s.charAt(i++)))));
                    break;
                default:
                    b.append(c);
                }
            } else if (c == '\\') {
                escape = true;
                continue;
            } else {
                b.append(c);
            }
        }

        return b.toString();
    }

    /**
     * @param b An ASCII encoded character 0-9 a-f A-F
     * @return The byte value of the character 0-16.
     */
    public static byte convertHexDigit(byte b) {
        if ((b >= '0') && (b <= '9')) {
            return (byte) (b - '0');
        }
        if ((b >= 'a') && (b <= 'f')) {
            return (byte) (b - 'a' + 10);
        }
        if ((b >= 'A') && (b <= 'F')) {
            return (byte) (b - 'A' + 10);
        }
        return 0;
    }
}

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