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<?php
/*
* 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;
/**
* Unified diff parser.
*/
class Parser
{
/**
* @param string $string
*
* @return Diff[]
*/
public function parse($string)
{
$lines = \preg_split('(\r\n|\r|\n)', $string);
if (!empty($lines) && $lines[\count($lines) - 1] == '') {
\array_pop($lines);
}
$lineCount = \count($lines);
$diffs = array();
$diff = null;
$collected = array();
for ($i = 0; $i < $lineCount; ++$i) {
if (\preg_match('(^---\\s+(?P<file>\\S+))', $lines[$i], $fromMatch) &&
\preg_match('(^\\+\\+\\+\\s+(?P<file>\\S+))', $lines[$i + 1], $toMatch)) {
if ($diff !== null) {
$this->parseFileDiff($diff, $collected);
$diffs[] = $diff;
$collected = array();
}
$diff = new Diff($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;
}
/**
* @param Diff $diff
* @param array $lines
*/
private function parseFileDiff(Diff $diff, array $lines)
{
$chunks = array();
$chunk = null;
foreach ($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)) {
$chunk = new Chunk(
$match['start'],
isset($match['startrange']) ? \max(1, $match['startrange']) : 1,
$match['end'],
isset($match['endrange']) ? \max(1, $match['endrange']) : 1
);
$chunks[] = $chunk;
$diffLines = array();
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']);
if (null !== $chunk) {
$chunk->setLines($diffLines);
}
}
}
$diff->setChunks($chunks);
}
}
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