public static function snakeToCamelCase()

in prod/php/ElasticOTel/Util/TextUtil.php [118:165]
40 lines of code
10 McCabe index (conditional complexity)

    public static function snakeToCamelCase(string $input): string
    {
        $inputLen = strlen($input);
        $result = '';
        $inputRemainderPos = 0;
        while (true) {
            $underscorePos = strpos($input, '_', $inputRemainderPos);
            if ($underscorePos === false) {
                break;
            }

            $result .= substr($input, $inputRemainderPos, $underscorePos - $inputRemainderPos);

            $nonUnderscorePos = null;
            for ($i = $underscorePos; $i !== $inputLen; ++$i) {
                if ($input[$i] !== '_') {
                    $nonUnderscorePos = $i;
                    break;
                }
            }

            if ($nonUnderscorePos === null) {
                $inputRemainderPos = strlen($input);
                break;
            }

            // Don't uppercase the first letter
            if (self::isEmptyString($result)) {
                $result .= $input[$nonUnderscorePos];
            } else {
                $result .= chr(self::toUpperCaseLetter(ord($input[$nonUnderscorePos])));
            }
            if ($nonUnderscorePos === $inputRemainderPos - 1) {
                break;
            }
            $inputRemainderPos = $nonUnderscorePos + 1;
        }

        if ($inputRemainderPos === strlen($input)) {
            return $result;
        }

        if (self::isEmptyString($result)) {
            return $input;
        }

        return $result . substr($input, $inputRemainderPos, $inputLen - $inputRemainderPos);
    }