AbstractChunkOutputBuilder.php
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AbstractChunkOutputBuilder.php
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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;
	}
	}