Java String Unescape unescapeString(String str)

Description

unescape String

License

Open Source License

Declaration

public static String unescapeString(String str) 

Method Source Code

//package com.java2s;
/** //from ww  w .ja  v a2 s.  com
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2016 Emerald Icemoon (emerald.icemoon@gmail.com)
 *
 * 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 {
    public static String unescapeString(String str) {
        return unescapeString(str, false, true);
    }

    public static String unescapeString(String str,
            boolean unescapeSingleQuotes, boolean unescapeDoubleQuotes) {
        boolean esc = false;
        StringBuilder bui = new StringBuilder(str.length());
        for (Character c : str.toCharArray()) {
            if (c == '\\' && !esc) {
                esc = true;
            } else if (esc) {
                switch (c) {
                case 't':
                    bui.append('\t');
                    break;
                case 'a':
                    bui.append((char) 0x07);
                    break;
                case 'b':
                    bui.append('\b');
                    break;
                case 'n':
                    bui.append('\n');
                    break;
                case 'r':
                    bui.append('\r');
                    break;
                case 'v':
                    bui.append((char) 0x0b);
                    break;
                case 'f':
                    bui.append((char) 0x0c);
                    break;
                case '\\':
                    bui.append('\\');
                    break;
                case '0':
                    bui.append('\0');
                    break;
                case '\'':
                    if (unescapeSingleQuotes) {
                        bui.append('\\');
                    } else {
                        throw new IllegalArgumentException(
                                "Escaped single quote, but single quotes are not escaped in this context.");
                    }
                    break;
                case '"':
                    if (unescapeDoubleQuotes) {
                        bui.append('"');
                    } else {
                        throw new IllegalArgumentException(
                                "Escaped double quote, but single quotes are not escaped in this context.");
                    }
                    break;
                default:
                    throw new IllegalArgumentException(
                            "Illegal escape sequence '" + c + "'");
                }
                esc = false;
            } else {
                bui.append(c);
            }
        }
        return bui.toString();
    }
}

Related

1. unescapeString(String s)
2. unescapeString(String s)
3. unescapeString(String s)
4. unescapeString(String s, char enclosed)
5. unEscapeString(String str)
6. unEscapeString(String str)
7. unEscapeString(String str)
8. unescapeString(String string)
9. unescapeString(String string, String escapeChars, char escapeSymbol)