static String unicodeToASCII()

in src/main/java/org/apache/commons/validator/routines/DomainValidator.java [1928:1959]

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

    static String unicodeToASCII(final String input) {
        if (isOnlyASCII(input)) { // skip possibly expensive processing
            return input;
        }
        try {
            final String ascii = IDN.toASCII(input);
            if (IDNBUGHOLDER.IDN_TOASCII_PRESERVES_TRAILING_DOTS) {
                return ascii;
            }
            final int length = input.length();
            if (length == 0) { // check there is a last character
                return input;
            }
            // RFC3490 3.1. 1)
            // Whenever dots are used as label separators, the following
            // characters MUST be recognized as dots: U+002E (full stop), U+3002
            // (ideographic full stop), U+FF0E (fullwidth full stop), U+FF61
            // (halfwidth ideographic full stop).
            final char lastChar = input.charAt(length - 1); // fetch original last char
            switch (lastChar) {
            case '\u002E': // "." full stop
            case '\u3002': // ideographic full stop
            case '\uFF0E': // fullwidth full stop
            case '\uFF61': // halfwidth ideographic full stop
                return ascii + "."; // restore the missing stop
            default:
                return ascii;
            }
        } catch (final IllegalArgumentException e) { // input is not valid
            return input;
        }
    }