function _parseCustomCharacterClass()

in tools/PasswordRulesParser.js [305:353]

• 40 lines of code
• 13 McCabe index (conditional complexity)

function _parseCustomCharacterClass(input, position)
{
    console.assert(position >= 0);
    console.assert(position < input.length);
    console.assert(input[position] === CHARACTER_CLASS_START_SENTINEL);

    let length = input.length;
    ++position;
    if (position >= length) {
        console.error("Found end-of-line instead of character class character");
        return [null, position];
    }

    let initialPosition = position;
    let result = [];
    do {
        let c = input[position];
        if (!_isASCIIPrintableCharacter(c)) {
            ++position;
            continue;
        }

        if (c === "-" && (position - initialPosition) > 0) {
            // FIXME: Should this be an error?
            console.warn("Ignoring '-'; a '-' may only appear as the first character in a character class");
            ++position;
            continue;
        }

        result.push(c);
        ++position;
        if (c === CHARACTER_CLASS_END_SENTINEL) {
            break;
        }
    } while (position < length);

    if (position < length && input[position] !== CHARACTER_CLASS_END_SENTINEL || position == length && input[position - 1] == CHARACTER_CLASS_END_SENTINEL) {
        // Fix up result; we over consumed.
        result.pop();
        return [result, position];
    }

    if (position < length && input[position] == CHARACTER_CLASS_END_SENTINEL) {
        return [result, position + 1];
    }

    console.error("Found end-of-line instead of end of character class");
    return [null, position];
}