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| 1 | <?php |
| 2 | |
| 3 | declare( strict_types = 1 ); |
| 4 | |
| 5 | namespace EntitySchema\Services\Diff; |
| 6 | |
| 7 | use Diff\Differ\MapDiffer; |
| 8 | use Diff\DiffOp\Diff\Diff; |
| 9 | use EntitySchema\Services\Converter\FullArrayEntitySchemaData; |
| 10 | |
| 11 | /** |
| 12 | * Computes the difference between two schemas. |
| 13 | * The difference is represented as an associative {@link Diff} with the following operations: |
| 14 | * |
| 15 | * - labels: an associative {@link Diff} where the keys are language codes |
| 16 | * and the values are {@link AtomicDiffOp}s for label addition, removal or change. |
| 17 | * - descriptions: an associative Diff where the keys are language codes |
| 18 | * and the values are {@link AtomicDiffOp}s for description addition, removal or change. |
| 19 | * - aliases: an associative {@link Diff} where the keys are language codes |
| 20 | * and the values are non-associative {@link Diff}s |
| 21 | * containing {@link DiffOpAdd}s and {@link DiffOpRemove}s. |
| 22 | * (A “change” to an alias appears as a removal+addition pair.) |
| 23 | * - schemaText: a single {@link AtomicDiffOp} for schema addition, removal or change. |
| 24 | * (Empty schema strings are considered absent. No fine-grained diffing on the text occurs.) |
| 25 | * |
| 26 | * @license GPL-2.0-or-later |
| 27 | */ |
| 28 | class EntitySchemaDiffer { |
| 29 | |
| 30 | private MapDiffer $recursiveMapDiffer; |
| 31 | |
| 32 | public function __construct() { |
| 33 | $this->recursiveMapDiffer = new MapDiffer( true ); |
| 34 | } |
| 35 | |
| 36 | public function diffSchemas( FullArrayEntitySchemaData $from, FullArrayEntitySchemaData $to ): Diff { |
| 37 | $from = $from->data; |
| 38 | $to = $to->data; |
| 39 | |
| 40 | if ( array_key_exists( 'schemaText', $from ) && $from['schemaText'] === '' ) { |
| 41 | unset( $from['schemaText'] ); |
| 42 | } |
| 43 | if ( array_key_exists( 'schemaText', $to ) && $to['schemaText'] === '' ) { |
| 44 | unset( $to['schemaText'] ); |
| 45 | } |
| 46 | |
| 47 | $diff = $this->recursiveMapDiffer->doDiff( $from, $to ); |
| 48 | |
| 49 | return new Diff( $diff, true ); |
| 50 | } |
| 51 | |
| 52 | } |