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<?php declare(strict_types=1);
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/*
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 * This file is part of sebastian/diff.
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 *
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 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace SebastianBergmann\Diff\Output;
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use function count;
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abstract class AbstractChunkOutputBuilder implements DiffOutputBuilderInterface
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{
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    /**
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     * Takes input of the diff array and returns the common parts.
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     * Iterates through diff line by line.
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     */
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    protected function getCommonChunks(array $diff, int $lineThreshold = 5): array
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    {
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        $diffSize     = count($diff);
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        $capturing    = false;
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        $chunkStart   = 0;
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        $chunkSize    = 0;
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        $commonChunks = [];
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        for ($i = 0; $i < $diffSize; ++$i) {
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            if ($diff[$i][1] === 0 /* OLD */) {
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                if ($capturing === false) {
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                    $capturing  = true;
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                    $chunkStart = $i;
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                    $chunkSize  = 0;
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                } else {
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                    ++$chunkSize;
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                }
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            } elseif ($capturing !== false) {
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                if ($chunkSize >= $lineThreshold) {
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                    $commonChunks[$chunkStart] = $chunkStart + $chunkSize;
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                }
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                $capturing = false;
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            }
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        }
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        if ($capturing !== false && $chunkSize >= $lineThreshold) {
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            $commonChunks[$chunkStart] = $chunkStart + $chunkSize;
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        }
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        return $commonChunks;
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    }
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}