Java String Unquote unquote(String value)

Description

Removes the first level of quotes and escapes from a string

License

Open Source License

Parameter

Parameter	Description
value	the string to unquote

Return

the unquoted string

Declaration

public static String unquote(String value) 

Method Source Code

//package com.java2s;
/*/*from  w  ww .  j  a  va2 s.c  o m*/
 *EXHIBIT A - Sun Industry Standards Source License
 *
 *"The contents of this file are subject to the Sun Industry
 *Standards Source License Version 1.2 (the "License");
 *You may not use this file except in compliance with the
 *License. You may obtain a copy of the 
 *License at http://wbemservices.sourceforge.net/license.html
 *
 *Software distributed under the License is distributed on
 *an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
 *express or implied. See the License for the specific
 *language governing rights and limitations under the License.
 *
 *The Original Code is WBEM Services.
 *
 *The Initial Developer of the Original Code is:
 *Sun Microsystems, Inc.
 *
 *Portions created by: Sun Microsystems, Inc.
 *are Copyright 2002 Sun Microsystems, Inc.
 *
 *All Rights Reserved.
 *
 *Contributor(s): Brian Schlosser
 */

public class Main {
    /**
     * Removes the first level of quotes and escapes from a string
     *
     * @param value the string to unquote
     * @return the unquoted string 
     */
    public static String unquote(String value) {
        if (value.startsWith("\"")) {
            if (value.endsWith("\"")) {
                value = unescapeString(value.substring(1, value.length() - 1));
            } else {
                throw new IllegalArgumentException(
                        "String literal " + value + " is not properly closed by a double quote.");
            }
        }
        return value;
    }

    /**
     * Removes the first level of escapes from a string
     *
     * @param inp the string to unescape
     * @return the unescaped string 
     */
    public static String unescapeString(String inp) {
        StringBuffer sb = new StringBuffer();
        int size = inp.length();
        for (int i = 0; i < size; i++) {
            char ch = inp.charAt(i);
            if (ch == '\\') {
                i++;
                if (i >= size) {
                    throw new IllegalArgumentException(
                            "String ended with an escape, but there was no subsequent character to escape");
                }
                ch = inp.charAt(i);
                switch (ch) {
                case 'n':
                    sb.append('\n');
                    break;
                case 't':
                    sb.append('\t');
                    break;
                case 'b':
                    sb.append('\b');
                    break;
                case 'r':
                    sb.append('\r');
                    break;
                case 'f':
                    sb.append('\f');
                    break;
                case '\\':
                case '\'':
                case '\"':
                    sb.append(ch);
                    break;
                case 'X':
                case 'x':
                    sb.append("\\x");
                    //?? Finish this
                    //                        int j = i;
                    //                        while(Character.digit(inp.charAt(j), 16) >= 0 && 
                    //                              j < (i + 4))
                    //                        {
                    //                            j++;
                    //                        }
                    //                        int value = Integer.parseInt(inp.substring(i, j), 16);
                    //                        i = j;  
                    //                        sb.append((char)value);
                    break;
                default:
                    throw new IllegalArgumentException("Invalid escape sequence '" + ch
                            + "' (valid sequences are  \\b  \\t  \\n  \\f  \\r  \\\"  \\\'  \\\\ \\x0000 \\X0000 )");
                }
            } else {
                sb.append(ch);
            }
        }
        return sb.toString();
    }
}

Related

1. unquote(String text)
2. unquote(String toUnquote, char quoteChar)
3. unquote(String val)
4. unquote(String val)
5. unquote(String value)
6. unquote(String value)
7. UnQuote(String value)
8. unquote(String value)
9. unquote(String value)