public int translate()

in src/main/java/org/apache/commons/lang3/text/translate/NumericEntityUnescaper.java [105:164]
49 lines of code
22 McCabe index (conditional complexity)

    public int translate(final CharSequence input, final int index, final Writer out) throws IOException {
        final int seqEnd = input.length();
        // Uses -2 to ensure there is something after the &#
        if (input.charAt(index) == '&' && index < seqEnd - 2 && input.charAt(index + 1) == '#') {
            int start = index + 2;
            boolean isHex = false;

            final char firstChar = input.charAt(start);
            if (firstChar == 'x' || firstChar == 'X') {
                start++;
                isHex = true;

                // Check there's more than just an x after the &#
                if (start == seqEnd) {
                    return 0;
                }
            }

            int end = start;
            // Note that this supports character codes without a ; on the end
            while (end < seqEnd && (input.charAt(end) >= '0' && input.charAt(end) <= '9' ||
                                    input.charAt(end) >= 'a' && input.charAt(end) <= 'f' ||
                                    input.charAt(end) >= 'A' && input.charAt(end) <= 'F')) {
                end++;
            }

            final boolean semiNext = end != seqEnd && input.charAt(end) == ';';

            if (!semiNext) {
                if (isSet(OPTION.semiColonRequired)) {
                    return 0;
                }
                if (isSet(OPTION.errorIfNoSemiColon)) {
                    throw new IllegalArgumentException("Semi-colon required at end of numeric entity");
                }
            }

            final int entityValue;
            try {
                if (isHex) {
                    entityValue = Integer.parseInt(input.subSequence(start, end).toString(), 16);
                } else {
                    entityValue = Integer.parseInt(input.subSequence(start, end).toString(), 10);
                }
            } catch (final NumberFormatException nfe) {
                return 0;
            }

            if (entityValue > 0xFFFF) {
                final char[] chars = Character.toChars(entityValue);
                out.write(chars[0]);
                out.write(chars[1]);
            } else {
                out.write(entityValue);
            }

            return 2 + end - start + (isHex ? 1 : 0) + (semiNext ? 1 : 0);
        }
        return 0;
    }