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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 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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                $diff = new Diff($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)) {
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                $chunk = new Chunk(
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                    (int) $match['start'],
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                    isset($match['startrange']) ? max(1, (int) $match['startrange']) : 1,
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                    (int) $match['end'],
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                    isset($match['endrange']) ? max(1, (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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                if (null !== $chunk) {
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                    $chunk->setLines($diffLines);
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                }
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            }
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        }
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        $diff->setChunks($chunks);
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    }
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}