private static String removeUnicodeEscapes()

in yoko-util/src/main/java/org/apache/yoko/util/cmsf/RepIds.java [167:230]

• 55 lines of code
• 27 McCabe index (conditional complexity)

    private static String removeUnicodeEscapes(String in) {
        // if no escape sequences are in the string, this is easy
        int escape = in.indexOf("\\U");
        if (escape < 0) {
            return in;
        }

        StringBuilder out = new StringBuilder(in.length());
        int start = 0;

        while (escape >= 0) {
            out.append(in.substring(start, escape));
            // step over the escape sequence
            escape += 2;

            int value = 0;
            for (int i=0; i<4; i++) {
                char ch = in.charAt(escape++);
                switch (ch) {
                  case '0':
                  case '1':
                  case '2':
                  case '3':
                  case '4':
                  case '5':
                  case '6':
                  case '7':
                  case '8':
                  case '9':
                     value = (value << 4) + ch - '0';
                     break;
                  case 'a':
                  case 'b':
                  case 'c':
                  case 'd':
                  case 'e':
                  case 'f':
                     value = (value << 4) + 10 + ch - 'a';
                     break;
                  case 'A':
                  case 'B':
                  case 'C':
                  case 'D':
                  case 'E':
                  case 'F':
                     value = (value << 4) + 10 + ch - 'A';
                     break;
                  default:
                      // not sure what to do here.  Just treat it as a 0 nibble
                      value = (value << 4);
                }
            }
            // now append this as a char value
            out.append((char)value);
            // now step and find the next one
            start = escape;
            escape = in.indexOf("\\U", escape);
        }
        // don't forget the trailing segment
        if (start < in.length()) {
            out.append(in.substring(start));
        }
        return out.toString();
    }