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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;
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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