Chris@14: <?php declare(strict_types=1);
Chris@14: /*
Chris@14:  * This file is part of sebastian/diff.
Chris@14:  *
Chris@14:  * (c) Sebastian Bergmann <sebastian@phpunit.de>
Chris@14:  *
Chris@14:  * For the full copyright and license information, please view the LICENSE
Chris@14:  * file that was distributed with this source code.
Chris@14:  */
Chris@14: 
Chris@14: namespace SebastianBergmann\Diff\Output;
Chris@14: 
Chris@14: abstract class AbstractChunkOutputBuilder implements DiffOutputBuilderInterface
Chris@14: {
Chris@14:     /**
Chris@14:      * Takes input of the diff array and returns the common parts.
Chris@14:      * Iterates through diff line by line.
Chris@14:      *
Chris@14:      * @param array $diff
Chris@14:      * @param int   $lineThreshold
Chris@14:      *
Chris@14:      * @return array
Chris@14:      */
Chris@14:     protected function getCommonChunks(array $diff, int $lineThreshold = 5): array
Chris@14:     {
Chris@14:         $diffSize     = \count($diff);
Chris@14:         $capturing    = false;
Chris@14:         $chunkStart   = 0;
Chris@14:         $chunkSize    = 0;
Chris@14:         $commonChunks = [];
Chris@14: 
Chris@14:         for ($i = 0; $i < $diffSize; ++$i) {
Chris@14:             if ($diff[$i][1] === 0 /* OLD */) {
Chris@14:                 if ($capturing === false) {
Chris@14:                     $capturing  = true;
Chris@14:                     $chunkStart = $i;
Chris@14:                     $chunkSize  = 0;
Chris@14:                 } else {
Chris@14:                     ++$chunkSize;
Chris@14:                 }
Chris@14:             } elseif ($capturing !== false) {
Chris@14:                 if ($chunkSize >= $lineThreshold) {
Chris@14:                     $commonChunks[$chunkStart] = $chunkStart + $chunkSize;
Chris@14:                 }
Chris@14: 
Chris@14:                 $capturing = false;
Chris@14:             }
Chris@14:         }
Chris@14: 
Chris@14:         if ($capturing !== false && $chunkSize >= $lineThreshold) {
Chris@14:             $commonChunks[$chunkStart] = $chunkStart + $chunkSize;
Chris@14:         }
Chris@14: 
Chris@14:         return $commonChunks;
Chris@14:     }
Chris@14: }