| Server IP : 49.231.201.246 / Your IP : 216.73.216.149 Web Server : Apache/2.4.18 (Ubuntu) System : Linux 246 4.4.0-210-generic #242-Ubuntu SMP Fri Apr 16 09:57:56 UTC 2021 x86_64 User : root ( 0) PHP Version : 7.0.33-0ubuntu0.16.04.16 Disable Function : exec,passthru,shell_exec,system,proc_open,popen,pcntl_exec MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /var/www/html/egp/vendor/sebastian/diff/src/ |
Upload File : |
<?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;
}
}