Chris@2: <?php declare(strict_types=1);
Chris@0: /*
Chris@2:  * This file is part of sebastian/diff.
Chris@0:  *
Chris@0:  * (c) Sebastian Bergmann <sebastian@phpunit.de>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace SebastianBergmann\Diff;
Chris@0: 
Chris@0: /**
Chris@0:  * Unified diff parser.
Chris@0:  */
Chris@2: final class Parser
Chris@0: {
Chris@0:     /**
Chris@0:      * @param string $string
Chris@0:      *
Chris@0:      * @return Diff[]
Chris@0:      */
Chris@2:     public function parse(string $string): array
Chris@0:     {
Chris@2:         $lines = \preg_split('(\r\n|\r|\n)', $string);
Chris@2: 
Chris@2:         if (!empty($lines) && $lines[\count($lines) - 1] === '') {
Chris@2:             \array_pop($lines);
Chris@2:         }
Chris@2: 
Chris@2:         $lineCount = \count($lines);
Chris@2:         $diffs     = [];
Chris@0:         $diff      = null;
Chris@2:         $collected = [];
Chris@0: 
Chris@0:         for ($i = 0; $i < $lineCount; ++$i) {
Chris@2:             if (\preg_match('(^---\\s+(?P<file>\\S+))', $lines[$i], $fromMatch) &&
Chris@2:                 \preg_match('(^\\+\\+\\+\\s+(?P<file>\\S+))', $lines[$i + 1], $toMatch)) {
Chris@0:                 if ($diff !== null) {
Chris@0:                     $this->parseFileDiff($diff, $collected);
Chris@2: 
Chris@0:                     $diffs[]   = $diff;
Chris@2:                     $collected = [];
Chris@0:                 }
Chris@0: 
Chris@0:                 $diff = new Diff($fromMatch['file'], $toMatch['file']);
Chris@2: 
Chris@0:                 ++$i;
Chris@0:             } else {
Chris@2:                 if (\preg_match('/^(?:diff --git |index [\da-f\.]+|[+-]{3} [ab])/', $lines[$i])) {
Chris@0:                     continue;
Chris@0:                 }
Chris@2: 
Chris@0:                 $collected[] = $lines[$i];
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@2:         if ($diff !== null && \count($collected)) {
Chris@0:             $this->parseFileDiff($diff, $collected);
Chris@2: 
Chris@0:             $diffs[] = $diff;
Chris@0:         }
Chris@0: 
Chris@0:         return $diffs;
Chris@0:     }
Chris@0: 
Chris@0:     private function parseFileDiff(Diff $diff, array $lines)
Chris@0:     {
Chris@2:         $chunks = [];
Chris@2:         $chunk  = null;
Chris@0: 
Chris@0:         foreach ($lines as $line) {
Chris@2:             if (\preg_match('/^@@\s+-(?P<start>\d+)(?:,\s*(?P<startrange>\d+))?\s+\+(?P<end>\d+)(?:,\s*(?P<endrange>\d+))?\s+@@/', $line, $match)) {
Chris@0:                 $chunk = new Chunk(
Chris@2:                     (int) $match['start'],
Chris@2:                     isset($match['startrange']) ? \max(1, (int) $match['startrange']) : 1,
Chris@2:                     (int) $match['end'],
Chris@2:                     isset($match['endrange']) ? \max(1, (int) $match['endrange']) : 1
Chris@0:                 );
Chris@0: 
Chris@0:                 $chunks[]  = $chunk;
Chris@2:                 $diffLines = [];
Chris@2: 
Chris@0:                 continue;
Chris@0:             }
Chris@0: 
Chris@2:             if (\preg_match('/^(?P<type>[+ -])?(?P<line>.*)/', $line, $match)) {
Chris@0:                 $type = Line::UNCHANGED;
Chris@0: 
Chris@2:                 if ($match['type'] === '+') {
Chris@0:                     $type = Line::ADDED;
Chris@2:                 } elseif ($match['type'] === '-') {
Chris@0:                     $type = Line::REMOVED;
Chris@0:                 }
Chris@0: 
Chris@0:                 $diffLines[] = new Line($type, $match['line']);
Chris@0: 
Chris@2:                 if (null !== $chunk) {
Chris@0:                     $chunk->setLines($diffLines);
Chris@0:                 }
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         $diff->setChunks($chunks);
Chris@0:     }
Chris@0: }