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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\Output;
use function count;
abstract class AbstractChunkOutputBuilder implements DiffOutputBuilderInterface
{
/**
* Takes input of the diff array and returns the common parts.
* Iterates through diff line by line.
*/
protected function getCommonChunks(array $diff, int $lineThreshold = 5): array
{
$diffSize = count($diff);
$capturing = false;
$chunkStart = 0;
$chunkSize = 0;
$commonChunks = [];
for ($i = 0; $i < $diffSize; ++$i) {
if ($diff[$i][1] === 0 /* OLD */) {
if ($capturing === false) {
$capturing = true;
$chunkStart = $i;
$chunkSize = 0;
} else {
++$chunkSize;
}
} elseif ($capturing !== false) {
if ($chunkSize >= $lineThreshold) {
$commonChunks[$chunkStart] = $chunkStart + $chunkSize;
}
$capturing = false;
}
}
if ($capturing !== false && $chunkSize >= $lineThreshold) {
$commonChunks[$chunkStart] = $chunkStart + $chunkSize;
}
return $commonChunks;
}
}