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<?php declare( strict_types = 1 ); namespace Wikimedia\Parsoid\Core; /** * Helper trait for implementations of ContentMetadataCollector. * * This trait is ideally empty. However, all implementations of * ContentMetadataCollector should `use` it. Then, when a method is * changed in the ContentMetadataCollector implementation, compatibility * code can be temporarily added to this trait in order to facilitate * migration. * * For example, suppose that the method `getFoo()` in ContentMetadataCollector` * was renamed to `getBar()`. Before, third-party code contains: * ``` * class MyCollector implements ContentMetadataCollector { * use ContentMetadataCollectorCompat; * * public function getFoo() { ... } * } * ``` * When the method is renamed in the `ContentMetadataCollector` interface * we then add the following to `ContentMetadataCollectorCompat`: * ``` * trait ContentMetadataCollectorCompat { * public function getBar() { * return $this->getFoo(); * } * } * ``` * * This prevents `MyCollector` from failing to implement * `ContentMetadataCollector` when Parsoid is upgraded to the latest version. * Over time, `MyCollector` will rename the method in its own implementation * and that will override the default implementation inherited from the * `ContentMetadataCollectorCompat` class. Then eventually the * compatibility method can be removed from this trait and we're back * where we started. * * Similarly, if we want to collect some new type of metadata, the * collection method can be added to `ContentMetadataCollector` at the * same time a default implementation is added to * `ContentMetadataCollectorCompat`; again ensuring that we don't * unnecessarily break classes which implement * `ContentMetadataCollector`. The default implementation could do * nothing, effectively ignoring the collection request, or it could * record portions of the metadata using other collection methods. / trait ContentMetadataCollectorCompat { / This trait is empty, in an ideal world. */ }

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