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Edit File : MemoryEfficientLongestCommonSubsequenceCalculator.php \| Size : 2.08 KB
<?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; final class MemoryEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator { /* * {@inheritdoc} */ public function calculate(array $from, array $to): array { $cFrom = \count($from); $cTo = \count($to); if ($cFrom === 0) { return []; } if ($cFrom === 1) { if (\in_array($from[0], $to, true)) { return [$from[0]]; } return []; } $i = (int) ($cFrom / 2); $fromStart = \array_slice($from, 0, $i); $fromEnd = \array_slice($from, $i); $llB = $this->length($fromStart, $to); $llE = $this->length(\array_reverse($fromEnd), \array_reverse($to)); $jMax = 0; $max = 0; for ($j = 0; $j <= $cTo; $j++) { $m = $llB[$j] + $llE[$cTo - $j]; if ($m >= $max) { $max = $m; $jMax = $j; } } $toStart = \array_slice($to, 0, $jMax); $toEnd = \array_slice($to, $jMax); return \array_merge( $this->calculate($fromStart, $toStart), $this->calculate($fromEnd, $toEnd) ); } private function length(array $from, array $to): array { $current = \array_fill(0, \count($to) + 1, 0); $cFrom = \count($from); $cTo = \count($to); for ($i = 0; $i < $cFrom; $i++) { $prev = $current; for ($j = 0; $j < $cTo; $j++) { if ($from[$i] === $to[$j]) { $current[$j + 1] = $prev[$j] + 1; } else { $current[$j + 1] = \max($current[$j], $prev[$j + 1]); } } } return $current; } } Back

Edit File : MemoryEfficientLongestCommonSubsequenceCalculator.php | Size : 2.08 KB

<?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;

final class MemoryEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
{
    /**
     * {@inheritdoc}
     */
    public function calculate(array $from, array $to): array
    {
        $cFrom = \count($from);
        $cTo   = \count($to);

if ($cFrom === 0) {
            return [];
        }

if ($cFrom === 1) {
            if (\in_array($from[0], $to, true)) {
                return [$from[0]];
            }

return [];
        }

$i         = (int) ($cFrom / 2);
        $fromStart = \array_slice($from, 0, $i);
        $fromEnd   = \array_slice($from, $i);
        $llB       = $this->length($fromStart, $to);
        $llE       = $this->length(\array_reverse($fromEnd), \array_reverse($to));
        $jMax      = 0;
        $max       = 0;

for ($j = 0; $j <= $cTo; $j++) {
            $m = $llB[$j] + $llE[$cTo - $j];

if ($m >= $max) {
                $max  = $m;
                $jMax = $j;
            }
        }

$toStart = \array_slice($to, 0, $jMax);
        $toEnd   = \array_slice($to, $jMax);

return \array_merge(
            $this->calculate($fromStart, $toStart),
            $this->calculate($fromEnd, $toEnd)
        );
    }

private function length(array $from, array $to): array
    {
        $current = \array_fill(0, \count($to) + 1, 0);
        $cFrom   = \count($from);
        $cTo     = \count($to);

for ($i = 0; $i < $cFrom; $i++) {
            $prev = $current;

for ($j = 0; $j < $cTo; $j++) {
                if ($from[$i] === $to[$j]) {
                    $current[$j + 1] = $prev[$j] + 1;
                } else {
                    $current[$j + 1] = \max($current[$j], $prev[$j + 1]);
                }
            }
        }

return $current;
    }
}

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