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📁 ..
📄 Chunk.php(2.43 KB)
📄 Diff.php(2.08 KB)
📄 Differ.php(6.58 KB)
📁 Exception
📄 Line.php(1.27 KB)
📄 LongestCommonSubsequenceCalculator.php(486 B)
📄 MemoryEfficientLongestCommonSubsequenceCalculator.php(2.61 KB)
📁 Output
📄 Parser.php(3.11 KB)
📄 TimeEfficientLongestCommonSubsequenceCalculator.php(2.31 KB)

Editing: Parser.php

<?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;

use function array_pop;
use function assert;
use function count;
use function max;
use function preg_match;
use function preg_split;

/**
 * Unified diff parser.
 */
final class Parser
{
    /**
     * @return Diff[]
     */
    public function parse(string $string): array
    {
        $lines = preg_split('(\r\n|\r|\n)', $string);

if (!empty($lines) && $lines[count($lines) - 1] === '') {
            array_pop($lines);
        }

$lineCount = count($lines);
        $diffs     = [];
        $diff      = null;
        $collected = [];

for ($i = 0; $i < $lineCount; $i++) {
            if (preg_match('#^---\h+"?(?P<file>[^\\v\\t"]+)#', $lines[$i], $fromMatch) &&
                preg_match('#^\\+\\+\\+\\h+"?(?P<file>[^\\v\\t"]+)#', $lines[$i + 1], $toMatch)) {
                if ($diff !== null) {
                    $this->parseFileDiff($diff, $collected);

$diffs[]   = $diff;
                    $collected = [];
                }

assert(!empty($fromMatch['file']));
                assert(!empty($toMatch['file']));

$diff = new Diff($fromMatch['file'], $toMatch['file']);

$i++;
            } else {
                if (preg_match('/^(?:diff --git |index [\da-f.]+|[+-]{3} [ab])/', $lines[$i])) {
                    continue;
                }

$collected[] = $lines[$i];
            }
        }

if ($diff !== null && count($collected)) {
            $this->parseFileDiff($diff, $collected);

$diffs[] = $diff;
        }

return $diffs;
    }

private function parseFileDiff(Diff $diff, array $lines): void
    {
        $chunks    = [];
        $chunk     = null;
        $diffLines = [];

foreach ($lines as $line) {
            if (preg_match('/^@@\s+-(?P<start>\d+)(?:,\s*(?P<startrange>\d+))?\s+\+(?P<end>\d+)(?:,\s*(?P<endrange>\d+))?\s+@@/', $line, $match, PREG_UNMATCHED_AS_NULL)) {
                $chunk = new Chunk(
                    (int) $match['start'],
                    isset($match['startrange']) ? max(0, (int) $match['startrange']) : 1,
                    (int) $match['end'],
                    isset($match['endrange']) ? max(0, (int) $match['endrange']) : 1,
                );

$chunks[]  = $chunk;
                $diffLines = [];

continue;
            }

if (preg_match('/^(?P<type>[+ -])?(?P<line>.*)/', $line, $match)) {
                $type = Line::UNCHANGED;

if ($match['type'] === '+') {
                    $type = Line::ADDED;
                } elseif ($match['type'] === '-') {
                    $type = Line::REMOVED;
                }

$diffLines[] = new Line($type, $match['line']);

$chunk?->setLines($diffLines);
            }
        }

$diff->setChunks($chunks);
    }
}

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