Java Unicode Escape unicodeUnescape(String st)

Description

unicode Unescape

License

Open Source License

Declaration

public static String unicodeUnescape(String st) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static String unicodeUnescape(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++;/*from  ww w.jav a 2s .  c  om*/
                    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();
    }
}

Related

1. unicodeEscaped(Character ch)
2. unicodeEscaped(final Character ch)
3. unicodeEscaped(final String str)
4. unicodeEscapeEncode(String unicode)
5. unicodeHexEscapeJava(char ch)