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| <?php | |
| namespace EntitySchema\Services\Diff; | |
| use Diff\Differ\MapDiffer; | |
| use Diff\DiffOp\Diff\Diff; | |
| use EntitySchema\Services\SchemaConverter\FullArraySchemaData; | |
| /** | |
| * Computes the difference between two schemas. | |
| * The difference is represented as an associative {@link Diff} with the following operations: | |
| * | |
| * - labels: an associative {@link Diff} where the keys are language codes | |
| * and the values are {@link AtomicDiffOp}s for label addition, removal or change. | |
| * - descriptions: an associative Diff where the keys are language codes | |
| * and the values are {@link AtomicDiffOp}s for description addition, removal or change. | |
| * - aliases: an associative {@link Diff} where the keys are language codes | |
| * and the values are non-associative {@link Diff}s | |
| * containing {@link DiffOpAdd}s and {@link DiffOpRemove}s. | |
| * (A “change” to an alias appears as a removal+addition pair.) | |
| * - schemaText: a single {@link AtomicDiffOp} for schema addition, removal or change. | |
| * (Empty schema strings are considered absent. No fine-grained diffing on the text occurs.) | |
| * | |
| * @license GPL-2.0-or-later | |
| */ | |
| class SchemaDiffer { | |
| private $recursiveMapDiffer; | |
| public function __construct() { | |
| $this->recursiveMapDiffer = new MapDiffer( true ); | |
| } | |
| public function diffSchemas( FullArraySchemaData $from, FullArraySchemaData $to ): Diff { | |
| $from = $from->data; | |
| $to = $to->data; | |
| if ( array_key_exists( 'schemaText', $from ) && $from['schemaText'] === '' ) { | |
| unset( $from['schemaText'] ); | |
| } | |
| if ( array_key_exists( 'schemaText', $to ) && $to['schemaText'] === '' ) { | |
| unset( $to['schemaText'] ); | |
| } | |
| $diff = $this->recursiveMapDiffer->doDiff( $from, $to ); | |
| return new Diff( $diff, true ); | |
| } | |
| } |