susina/psr2-code-generator

<?php declare(strict_types=1);

namespace Susina\Codegen\Generator\Comparator;

use phootwork\lang\Comparator;

/**
 * Default use statement comparator.
 *
 * Compares use statements case-sensitive, with lower-case beeing sorted first
 */
class DefaultUseStatementComparator implements Comparator
{
    public function compare($a, $b): int
    {
        // find first difference
        $cmp1 = null;
        $cmp2 = null;
        $min = min(strlen($a), strlen($b));
        for ($i = 0; $i < $min; ++$i) {
            if ($a[$i] != $b[$i]) {
                $cmp1 = $a[$i];
                $cmp2 = $b[$i];

                break;
            }
        }

        if (null === $cmp1 && null === $cmp2) {
            return 0;
        }

        return $this->getAscii($cmp1) - $this->getAscii($cmp2);
    }

    private function getAscii(?string $str): int
    {
        $ord = ord($str ?? '');
        if ($ord >= 65 && $ord <= 90) {
            $ord += 32;
        } elseif ($ord >= 97 && $ord <= 122) {
            $ord -= 32;
        }

        return $ord;
    }
}