Created
September 28, 2013 12:50
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Unescapes a string that contains standard Java escape sequences: - \b \f \n \r \t \" \' : BS, FF, NL, CR, TAB, single and double quote
- \X \XX \XXX : Octal character from 0 to 377 (that is in Hex: 0x00 to 0xFF)
- \uXXXX : Hexadecimal based Unicode character
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| /** | |
| * Unescapes a string that contains standard Java escape sequences. | |
| * <ul> | |
| * <li><strong>\b \f \n \r \t \" \'</strong> : | |
| * BS, FF, NL, CR, TAB, double and single quote.</li> | |
| * <li><strong>\X \XX \XXX</strong> : Octal character | |
| * specification (0 - 377, 0x00 - 0xFF).</li> | |
| * <li><strong>\uXXXX</strong> : Hexadecimal based Unicode character.</li> | |
| * </ul> | |
| * | |
| * @param st | |
| * A string optionally containing standard java escape sequences. | |
| * @return The translated string. | |
| */ | |
| public String unescapeJavaString(String st) { | |
| StringBuilder sb = new StringBuilder(st.length()); | |
| for (int i = 0; i < st.length(); i++) { | |
| char ch = st.charAt(i); | |
| if (ch == '\\') { | |
| char nextChar = (i == st.length() - 1) ? '\\' : st | |
| .charAt(i + 1); | |
| // Octal escape? | |
| if (nextChar >= '0' && nextChar <= '7') { | |
| String code = "" + nextChar; | |
| i++; | |
| if ((i < st.length() - 1) && st.charAt(i + 1) >= '0' | |
| && st.charAt(i + 1) <= '7') { | |
| code += st.charAt(i + 1); | |
| i++; | |
| if ((i < st.length() - 1) && st.charAt(i + 1) >= '0' | |
| && st.charAt(i + 1) <= '7') { | |
| code += st.charAt(i + 1); | |
| i++; | |
| } | |
| } | |
| sb.append((char) Integer.parseInt(code, 8)); | |
| continue; | |
| } | |
| switch (nextChar) { | |
| case '\\': | |
| ch = '\\'; | |
| break; | |
| case 'b': | |
| ch = '\b'; | |
| break; | |
| case 'f': | |
| ch = '\f'; | |
| break; | |
| case 'n': | |
| ch = '\n'; | |
| break; | |
| case 'r': | |
| ch = '\r'; | |
| break; | |
| case 't': | |
| ch = '\t'; | |
| break; | |
| case '\"': | |
| ch = '\"'; | |
| break; | |
| case '\'': | |
| ch = '\''; | |
| break; | |
| // Hex Unicode: u???? | |
| case 'u': | |
| if (i >= st.length() - 5) { | |
| ch = 'u'; | |
| break; | |
| } | |
| int code = Integer.parseInt( | |
| "" + st.charAt(i + 2) + st.charAt(i + 3) | |
| + st.charAt(i + 4) + st.charAt(i + 5), 16); | |
| sb.append(Character.toChars(code)); | |
| i += 5; | |
| continue; | |
| } | |
| i++; | |
| } | |
| sb.append(ch); | |
| } | |
| return sb.toString(); | |
| } |
No license, it is absolutely free
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