public String nysiis()

in src/main/java/org/apache/commons/codec/language/Nysiis.java [250:320]
47 lines of code
14 McCabe index (conditional complexity)

    public String nysiis(String str) {
        if (str == null) {
            return null;
        }

        // Use the same clean rules as Soundex
        str = SoundexUtils.clean(str);

        if (str.isEmpty()) {
            return str;
        }

        // Translate first characters of name:
        // MAC -> MCC, KN -> NN, K -> C, PH | PF -> FF, SCH -> SSS
        str = PAT_MAC.matcher(str).replaceFirst("MCC");
        str = PAT_KN.matcher(str).replaceFirst("NN");
        str = PAT_K.matcher(str).replaceFirst("C");
        str = PAT_PH_PF.matcher(str).replaceFirst("FF");
        str = PAT_SCH.matcher(str).replaceFirst("SSS");

        // Translate last characters of name:
        // EE -> Y, IE -> Y, DT | RT | RD | NT | ND -> D
        str = PAT_EE_IE.matcher(str).replaceFirst("Y");
        str = PAT_DT_ETC.matcher(str).replaceFirst("D");

        // First character of key = first character of name.
        final StringBuilder key = new StringBuilder(str.length());
        key.append(str.charAt(0));

        // Transcode remaining characters, incrementing by one character each time
        final char[] chars = str.toCharArray();
        final int len = chars.length;

        for (int i = 1; i < len; i++) {
            final char next = i < len - 1 ? chars[i + 1] : SPACE;
            final char aNext = i < len - 2 ? chars[i + 2] : SPACE;
            final char[] transcoded = transcodeRemaining(chars[i - 1], chars[i], next, aNext);
            System.arraycopy(transcoded, 0, chars, i, transcoded.length);

            // only append the current char to the key if it is different from the last one
            if (chars[i] != chars[i - 1]) {
                key.append(chars[i]);
            }
        }

        if (key.length() > 1) {
            char lastChar = key.charAt(key.length() - 1);

            // If last character is S, remove it.
            if (lastChar == 'S') {
                key.deleteCharAt(key.length() - 1);
                lastChar = key.charAt(key.length() - 1);
            }

            if (key.length() > 2) {
                final char last2Char = key.charAt(key.length() - 2);
                // If last characters are AY, replace with Y.
                if (last2Char == 'A' && lastChar == 'Y') {
                    key.deleteCharAt(key.length() - 2);
                }
            }

            // If last character is A, remove it.
            if (lastChar == 'A') {
                key.deleteCharAt(key.length() - 1);
            }
        }

        final String string = key.toString();
        return isStrict() ? string.substring(0, Math.min(TRUE_LENGTH, string.length())) : string;
    }