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1 <?php declare(strict_types=1);
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2 /*
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3 * This file is part of sebastian/diff.
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4 *
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5 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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6 *
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7 * For the full copyright and license information, please view the LICENSE
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8 * file that was distributed with this source code.
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9 */
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10
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11 namespace SebastianBergmann\Diff;
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12
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13 /**
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14 * Unified diff parser.
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15 */
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16 final class Parser
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17 {
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18 /**
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19 * @param string $string
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20 *
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21 * @return Diff[]
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22 */
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23 public function parse(string $string): array
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24 {
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25 $lines = \preg_split('(\r\n|\r|\n)', $string);
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26
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27 if (!empty($lines) && $lines[\count($lines) - 1] === '') {
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28 \array_pop($lines);
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29 }
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30
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31 $lineCount = \count($lines);
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32 $diffs = [];
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33 $diff = null;
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34 $collected = [];
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35
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36 for ($i = 0; $i < $lineCount; ++$i) {
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37 if (\preg_match('(^---\\s+(?P<file>\\S+))', $lines[$i], $fromMatch) &&
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38 \preg_match('(^\\+\\+\\+\\s+(?P<file>\\S+))', $lines[$i + 1], $toMatch)) {
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39 if ($diff !== null) {
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40 $this->parseFileDiff($diff, $collected);
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41
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42 $diffs[] = $diff;
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43 $collected = [];
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44 }
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45
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46 $diff = new Diff($fromMatch['file'], $toMatch['file']);
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47
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48 ++$i;
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49 } else {
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50 if (\preg_match('/^(?:diff --git |index [\da-f\.]+|[+-]{3} [ab])/', $lines[$i])) {
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51 continue;
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52 }
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53
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54 $collected[] = $lines[$i];
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55 }
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56 }
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57
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58 if ($diff !== null && \count($collected)) {
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59 $this->parseFileDiff($diff, $collected);
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60
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61 $diffs[] = $diff;
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62 }
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63
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64 return $diffs;
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65 }
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66
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67 private function parseFileDiff(Diff $diff, array $lines)
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68 {
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69 $chunks = [];
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70 $chunk = null;
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71
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72 foreach ($lines as $line) {
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73 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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74 $chunk = new Chunk(
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75 (int) $match['start'],
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76 isset($match['startrange']) ? \max(1, (int) $match['startrange']) : 1,
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77 (int) $match['end'],
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78 isset($match['endrange']) ? \max(1, (int) $match['endrange']) : 1
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79 );
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80
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81 $chunks[] = $chunk;
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82 $diffLines = [];
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83
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84 continue;
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85 }
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86
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87 if (\preg_match('/^(?P<type>[+ -])?(?P<line>.*)/', $line, $match)) {
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88 $type = Line::UNCHANGED;
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89
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90 if ($match['type'] === '+') {
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91 $type = Line::ADDED;
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92 } elseif ($match['type'] === '-') {
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93 $type = Line::REMOVED;
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94 }
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95
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96 $diffLines[] = new Line($type, $match['line']);
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97
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98 if (null !== $chunk) {
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99 $chunk->setLines($diffLines);
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100 }
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101 }
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102 }
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103
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104 $diff->setChunks($chunks);
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105 }
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106 }
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