Popy\Calendar\Formatter\NumberConverter\Roman::from()

Complexity

Conditions	6
Paths	9

Size

Total Lines	32
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
    public function from($input)
    {
        if ($input === '0') {
            return 0;
        }

        $res = $i = 0;
        $len = strlen($input);
        $sign = 1;

        if (substr($input, 0, 1) === '-') {
            $sign = -1;
            $i = 1;
        }

        while ($i < $len) {
            foreach (static::$table as $symbol => $value) {
                $sl = strlen($symbol);

                if ($symbol === substr($input, $i, $sl)) {
                    $res += $value;
                    $i += $sl;

                    continue 2;
                }
            }

            // If nothing matched, exit.
            return null;
        }

        return $sign * $res;
    }