113 lines
3.1 KiB
PHP
113 lines
3.1 KiB
PHP
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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;
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use function array_pop;
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use function assert;
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use function count;
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use function max;
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use function preg_match;
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use function preg_split;
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/**
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* Unified diff parser.
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*/
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final class Parser
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{
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/**
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* @return Diff[]
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*/
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public function parse(string $string): array
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{
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$lines = preg_split('(\r\n|\r|\n)', $string);
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if (!empty($lines) && $lines[count($lines) - 1] === '') {
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array_pop($lines);
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}
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$lineCount = count($lines);
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$diffs = [];
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$diff = null;
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$collected = [];
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for ($i = 0; $i < $lineCount; $i++) {
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if (preg_match('#^---\h+"?(?P<file>[^\\v\\t"]+)#', $lines[$i], $fromMatch) &&
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preg_match('#^\\+\\+\\+\\h+"?(?P<file>[^\\v\\t"]+)#', $lines[$i + 1], $toMatch)) {
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if ($diff !== null) {
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$this->parseFileDiff($diff, $collected);
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$diffs[] = $diff;
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$collected = [];
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}
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assert(!empty($fromMatch['file']));
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assert(!empty($toMatch['file']));
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$diff = new Diff($fromMatch['file'], $toMatch['file']);
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$i++;
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} else {
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if (preg_match('/^(?:diff --git |index [\da-f.]+|[+-]{3} [ab])/', $lines[$i])) {
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continue;
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}
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$collected[] = $lines[$i];
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}
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}
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if ($diff !== null && count($collected)) {
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$this->parseFileDiff($diff, $collected);
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$diffs[] = $diff;
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}
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return $diffs;
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}
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private function parseFileDiff(Diff $diff, array $lines): void
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{
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$chunks = [];
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$chunk = null;
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$diffLines = [];
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foreach ($lines as $line) {
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if (preg_match('/^@@\s+-(?P<start>\d+)(?:,\s*(?P<startrange>\d+))?\s+\+(?P<end>\d+)(?:,\s*(?P<endrange>\d+))?\s+@@/', $line, $match, PREG_UNMATCHED_AS_NULL)) {
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$chunk = new Chunk(
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(int) $match['start'],
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isset($match['startrange']) ? max(0, (int) $match['startrange']) : 1,
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(int) $match['end'],
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isset($match['endrange']) ? max(0, (int) $match['endrange']) : 1,
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);
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$chunks[] = $chunk;
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$diffLines = [];
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continue;
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}
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if (preg_match('/^(?P<type>[+ -])?(?P<line>.*)/', $line, $match)) {
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$type = Line::UNCHANGED;
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if ($match['type'] === '+') {
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$type = Line::ADDED;
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} elseif ($match['type'] === '-') {
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$type = Line::REMOVED;
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}
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$diffLines[] = new Line($type, $match['line']);
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$chunk?->setLines($diffLines);
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}
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}
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$diff->setChunks($chunks);
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}
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}
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