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1 | <?php |
2 | /** |
3 | * WikiLambda ZObjectDiffer. Differ service entrypoint, implements doDiff on |
4 | * any kind of ZObject. Depending on the types, uses ZObjectMapDiffer or |
5 | * ZObjectListDiffer. |
6 | * |
7 | * @file |
8 | * @ingroup Extensions |
9 | * @copyright 2020– Abstract Wikipedia team; see AUTHORS.txt |
10 | * @license MIT |
11 | */ |
12 | |
13 | namespace MediaWiki\Extension\WikiLambda\Diff; |
14 | |
15 | use Diff\Comparer\StrictComparer; |
16 | use Diff\Differ\Differ; |
17 | use Diff\DiffOp\Diff\Diff; |
18 | use Diff\DiffOp\DiffOp; |
19 | use Diff\DiffOp\DiffOpChange; |
20 | use Exception; |
21 | |
22 | class ZObjectDiffer { |
23 | |
24 | private const DIFF_STRING = 1; |
25 | private const DIFF_ARRAY = 2; |
26 | private const DIFF_ASSOCIATIVE = 3; |
27 | |
28 | private ZObjectListDiffer $listDiffer; |
29 | private ZObjectMapDiffer $mapDiffer; |
30 | private StrictComparer $comparer; |
31 | |
32 | public function __construct() { |
33 | $this->comparer = new StrictComparer(); |
34 | $this->listDiffer = new ZObjectListDiffer(); |
35 | $this->mapDiffer = new ZObjectMapDiffer( $this->listDiffer, $this->comparer ); |
36 | $this->listDiffer->setZObjectDiffer( $this ); |
37 | } |
38 | |
39 | /** |
40 | * @see Differ::doDiff |
41 | * |
42 | * Takes two ZObjects, computes the diff, and returns this diff as an array of DiffOp. |
43 | * |
44 | * @param array|string $oldValues The first array |
45 | * @param array|string $newValues The second array |
46 | * |
47 | * @throws Exception |
48 | * @return DiffOp returns either an atomic DiffOp or a new |
49 | */ |
50 | public function doDiff( $oldValues, $newValues ): DiffOp { |
51 | $oldDiffer = $this->getDifferType( $oldValues ); |
52 | $newDiffer = $this->getDifferType( $newValues ); |
53 | |
54 | if ( $oldDiffer !== $newDiffer ) { |
55 | // If the type is different, register a DiffOpChange |
56 | return new DiffOpChange( $oldValues, $newValues ); |
57 | } elseif ( $oldDiffer === self::DIFF_ASSOCIATIVE ) { |
58 | // If the items are associative arrays, call ZObjectMapDiffer::doDiff |
59 | return new Diff( $this->mapDiffer->doDiff( $oldValues, $newValues ) ); |
60 | } elseif ( $oldDiffer === self::DIFF_ARRAY ) { |
61 | // If the items are non-associative arrays, call ZObjectListDiffer::doDiff |
62 | return new Diff( $this->listDiffer->doDiff( $oldValues, $newValues ), true ); |
63 | } else { |
64 | // If the items are strings and not equal, register a DiffOpChange |
65 | if ( !$this->comparer->valuesAreEqual( $oldValues, $newValues ) ) { |
66 | return new DiffOpChange( $oldValues, $newValues ); |
67 | } |
68 | } |
69 | |
70 | // Return an empty diff |
71 | return new Diff( [] ); |
72 | } |
73 | |
74 | /** |
75 | * Returns the type of differ that we should use for a given input. |
76 | * |
77 | * @param array|string $input |
78 | * @return int |
79 | */ |
80 | protected function getDifferType( $input ): int { |
81 | if ( is_array( $input ) ) { |
82 | return $this->isAssociative( $input ) |
83 | ? self::DIFF_ASSOCIATIVE |
84 | : self::DIFF_ARRAY; |
85 | } |
86 | return self::DIFF_STRING; |
87 | } |
88 | |
89 | /** |
90 | * Returns if an array is associative or not. |
91 | * |
92 | * @param array $array |
93 | * @return bool |
94 | */ |
95 | private function isAssociative( array $array ): bool { |
96 | foreach ( $array as $key => $value ) { |
97 | if ( is_string( $key ) ) { |
98 | return true; |
99 | } |
100 | } |
101 | return false; |
102 | } |
103 | |
104 | /** |
105 | * Returns a flat collection of diffs with an absolute path and the DiffOp |
106 | * that has been detected under that path. |
107 | * |
108 | * @param DiffOp $diff |
109 | * @return array |
110 | */ |
111 | public static function flattenDiff( $diff ): array { |
112 | // Finish condition when the $diff is an atomic DiffOp |
113 | if ( $diff->isAtomic() ) { |
114 | return [ [ |
115 | 'path' => [], |
116 | 'op' => $diff |
117 | ] ]; |
118 | } |
119 | |
120 | // Else prepend the key to the path and return a flattened array of DiffOps |
121 | // If it's not atomic, then $diff must be an instanceof Diff |
122 | '@phan-var Diff $diff'; |
123 | $branches = []; |
124 | foreach ( $diff->getOperations() as $key => $diffOp ) { |
125 | $flatOps = self::flattenDiff( $diffOp ); |
126 | for ( $index = 0; $index < count( $flatOps ); $index++ ) { |
127 | array_unshift( $flatOps[$index]['path'], $key ); |
128 | } |
129 | $branches = array_merge( $branches, $flatOps ); |
130 | } |
131 | return $branches; |
132 | } |
133 | |
134 | } |