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Viewing file:     TimeEfficientLongestCommonSubsequenceCalculator.php (2.31 KB)      -rw-r--r--
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<?php declare(strict_types=1);
/*
 * This file is part of sebastian/diff.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\Diff;

use function array_reverse;
use function count;
use function max;
use SplFixedArray;

final class TimeEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
{
    /**
     * {@inheritdoc}
     */
    public function calculate(array $from, array $to): array
    {
        $common     = [];
        $fromLength = count($from);
        $toLength   = count($to);
        $width      = $fromLength + 1;
        $matrix     = new SplFixedArray($width * ($toLength + 1));

        for ($i = 0; $i <= $fromLength; ++$i) {
            $matrix[$i] = 0;
        }

        for ($j = 0; $j <= $toLength; ++$j) {
            $matrix[$j * $width] = 0;
        }

        for ($i = 1; $i <= $fromLength; ++$i) {
            for ($j = 1; $j <= $toLength; ++$j) {
                $o = ($j * $width) + $i;

                // don't use max() to avoid function call overhead
                $firstOrLast = $from[$i - 1] === $to[$j - 1] ? $matrix[$o - $width - 1] + 1 : 0;

                if ($matrix[$o - 1] > $matrix[$o - $width]) {
                    if ($firstOrLast > $matrix[$o - 1]) {
                        $matrix[$o] = $firstOrLast;
                    } else {
                        $matrix[$o] = $matrix[$o - 1];
                    }
                } else {
                    if ($firstOrLast > $matrix[$o - $width]) {
                        $matrix[$o] = $firstOrLast;
                    } else {
                        $matrix[$o] = $matrix[$o - $width];
                    }
                }
            }
        }

        $i = $fromLength;
        $j = $toLength;

        while ($i > 0 && $j > 0) {
            if ($from[$i - 1] === $to[$j - 1]) {
                $common[] = $from[$i - 1];
                --$i;
                --$j;
            } else {
                $o = ($j * $width) + $i;

                if ($matrix[$o - $width] > $matrix[$o - 1]) {
                    --$j;
                } else {
                    --$i;
                }
            }
        }

        return array_reverse($common);
    }
}

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