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<title>[44108] trunk: Blocks: Introduce `WP_Block_Type` and `WP_Block_Type_Registry` classes.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/44108">44108</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/44108","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>pento</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2018-12-13 09:43:29 +0000 (Thu, 13 Dec 2018)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Blocks: Introduce `WP_Block_Type` and `WP_Block_Type_Registry` classes.

These are the foundational classes allowing blocks to be registered and used throughout WordPress.

This commit also includes the `has_block()` and `has_blocks()` functions, which are required for unit testing these classes.

Merges <a href="https://core.trac.wordpress.org/changeset/43742">[43742]</a> from the 5.0 branch to trunk.

Props adamsilverstein, danielbachhuber, desrosj.
Fixes <a href="https://core.trac.wordpress.org/ticket/45097">#45097</a>.
See <a href="https://core.trac.wordpress.org/ticket/45109">#45109</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpsettingsphp">trunk/src/wp-settings.php</a></li>
<li><a href="#trunktestsphpunitincludesbootstrapphp">trunk/tests/phpunit/includes/bootstrap.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesblocksphp">trunk/src/wp-includes/blocks.php</a></li>
<li><a href="#trunksrcwpincludesclasswpblocktyperegistryphp">trunk/src/wp-includes/class-wp-block-type-registry.php</a></li>
<li><a href="#trunksrcwpincludesclasswpblocktypephp">trunk/src/wp-includes/class-wp-block-type.php</a></li>
<li><a href="#trunktestsphpunitincludesclasswpfakeblocktypephp">trunk/tests/phpunit/includes/class-wp-fake-block-type.php</a></li>
<li>trunk/tests/phpunit/tests/blocks/</li>
</ul>

<h3>Property Changed</h3>
<ul>
<li><a href="#trunk">trunk/</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: trunk
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- trunk        2018-12-13 09:37:05 UTC (rev 44107)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ trunk 2018-12-13 09:43:29 UTC (rev 44108)
</ins><a id="trunk"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: trunk</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.3:20543
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/4.9:43557
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/branches/5.0:43681-43682,43684-43687,43720,43726-43727,43729-43731,43734-43737,43739,43741
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/branches/5.0:43681-43682,43684-43687,43720,43726-43727,43729-43731,43734-43737,43739,43741-43742
</ins><span class="cx" style="display: block; padding: 0 10px"> /trunk:18512
</span><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="trunksrcwpincludesblocksphpfromrev43742branches50srcwpincludesblocksphp"></a>
<div class="copfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Copied: trunk/src/wp-includes/blocks.php (from rev 43742, branches/5.0/src/wp-includes/blocks.php)</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/blocks.php                          (rev 0)
+++ trunk/src/wp-includes/blocks.php    2018-12-13 09:43:29 UTC (rev 44108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,61 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * Functions related to registering and parsing blocks.
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ * @since 5.0.0
+ */
+
+/**
+ * Determine whether a post or content string has blocks.
+ *
+ * This test optimizes for performance rather than strict accuracy, detecting
+ * the pattern of a block but not validating its structure. For strict accuracy,
+ * you should use the block parser on post content.
+ *
+ * @since 5.0.0
+ * @see parse_blocks()
+ *
+ * @param int|string|WP_Post|null $post Optional. Post content, post ID, or post object. Defaults to global $post.
+ * @return bool Whether the post has blocks.
+ */
+function has_blocks( $post = null ) {
+       if ( ! is_string( $post ) ) {
+               $wp_post = get_post( $post );
+               if ( $wp_post instanceof WP_Post ) {
+                       $post = $wp_post->post_content;
+               }
+       }
+
+       return false !== strpos( (string) $post, '<!-- wp:' );
+}
+
+/**
+ * Determine whether a $post or a string contains a specific block type.
+ *
+ * This test optimizes for performance rather than strict accuracy, detecting
+ * the block type exists but not validating its structure. For strict accuracy,
+ * you should use the block parser on post content.
+ *
+ * @since 5.0.0
+ * @see parse_blocks()
+ *
+ * @param string                  $block_type Full Block type to look for.
+ * @param int|string|WP_Post|null $post Optional. Post content, post ID, or post object. Defaults to global $post.
+ * @return bool Whether the post content contains the specified block.
+ */
+function has_block( $block_type, $post = null ) {
+       if ( ! has_blocks( $post ) ) {
+               return false;
+       }
+
+       if ( ! is_string( $post ) ) {
+               $wp_post = get_post( $post );
+               if ( $wp_post instanceof WP_Post ) {
+                       $post = $wp_post->post_content;
+               }
+       }
+
+       return false !== strpos( $post, '<!-- wp:' . $block_type . ' ' );
+}
</ins></span></pre></div>
<a id="trunksrcwpincludesclasswpblocktyperegistryphpfromrev43742branches50srcwpincludesclasswpblocktyperegistryphp"></a>
<div class="copfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Copied: trunk/src/wp-includes/class-wp-block-type-registry.php (from rev 43742, branches/5.0/src/wp-includes/class-wp-block-type-registry.php)</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-block-type-registry.php                            (rev 0)
+++ trunk/src/wp-includes/class-wp-block-type-registry.php      2018-12-13 09:43:29 UTC (rev 44108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,173 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * Blocks API: WP_Block_Type_Registry class
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ * @since 5.0.0
+ */
+
+/**
+ * Core class used for interacting with block types.
+ *
+ * @since 5.0.0
+ */
+final class WP_Block_Type_Registry {
+       /**
+        * Registered block types, as `$name => $instance` pairs.
+        *
+        * @since 5.0.0
+        * @var WP_Block_Type[]
+        */
+       private $registered_block_types = array();
+
+       /**
+        * Container for the main instance of the class.
+        *
+        * @since 5.0.0
+        * @var WP_Block_Type_Registry|null
+        */
+       private static $instance = null;
+
+       /**
+        * Registers a block type.
+        *
+        * @since 5.0.0
+        *
+        * @param string|WP_Block_Type $name Block type name including namespace, or alternatively a
+        *                                   complete WP_Block_Type instance. In case a WP_Block_Type
+        *                                   is provided, the $args parameter will be ignored.
+        * @param array                $args {
+        *     Optional. Array of block type arguments. Any arguments may be defined, however the
+        *     ones described below are supported by default. Default empty array.
+        *
+        *     @type callable $render_callback Callback used to render blocks of this block type.
+        *     @type array    $attributes      Block attributes mapping, property name to schema.
+        * }
+        * @return WP_Block_Type|false The registered block type on success, or false on failure.
+        */
+       public function register( $name, $args = array() ) {
+               $block_type = null;
+               if ( $name instanceof WP_Block_Type ) {
+                       $block_type = $name;
+                       $name       = $block_type->name;
+               }
+
+               if ( ! is_string( $name ) ) {
+                       $message = __( 'Block type names must be strings.' );
+                       _doing_it_wrong( __METHOD__, $message, '5.0.0' );
+                       return false;
+               }
+
+               if ( preg_match( '/[A-Z]+/', $name ) ) {
+                       $message = __( 'Block type names must not contain uppercase characters.' );
+                       _doing_it_wrong( __METHOD__, $message, '5.0.0' );
+                       return false;
+               }
+
+               $name_matcher = '/^[a-z0-9-]+\/[a-z0-9-]+$/';
+               if ( ! preg_match( $name_matcher, $name ) ) {
+                       $message = __( 'Block type names must contain a namespace prefix. Example: my-plugin/my-custom-block-type' );
+                       _doing_it_wrong( __METHOD__, $message, '5.0.0' );
+                       return false;
+               }
+
+               if ( $this->is_registered( $name ) ) {
+                       /* translators: %s: block name */
+                       $message = sprintf( __( 'Block type "%s" is already registered.' ), $name );
+                       _doing_it_wrong( __METHOD__, $message, '5.0.0' );
+                       return false;
+               }
+
+               if ( ! $block_type ) {
+                       $block_type = new WP_Block_Type( $name, $args );
+               }
+
+               $this->registered_block_types[ $name ] = $block_type;
+
+               return $block_type;
+       }
+
+       /**
+        * Unregisters a block type.
+        *
+        * @since 5.0.0
+        *
+        * @param string|WP_Block_Type $name Block type name including namespace, or alternatively a
+        *                                   complete WP_Block_Type instance.
+        * @return WP_Block_Type|false The unregistered block type on success, or false on failure.
+        */
+       public function unregister( $name ) {
+               if ( $name instanceof WP_Block_Type ) {
+                       $name = $name->name;
+               }
+
+               if ( ! $this->is_registered( $name ) ) {
+                       /* translators: %s: block name */
+                       $message = sprintf( __( 'Block type "%s" is not registered.' ), $name );
+                       _doing_it_wrong( __METHOD__, $message, '5.0.0' );
+                       return false;
+               }
+
+               $unregistered_block_type = $this->registered_block_types[ $name ];
+               unset( $this->registered_block_types[ $name ] );
+
+               return $unregistered_block_type;
+       }
+
+       /**
+        * Retrieves a registered block type.
+        *
+        * @since 5.0.0
+        *
+        * @param string $name Block type name including namespace.
+        * @return WP_Block_Type|null The registered block type, or null if it is not registered.
+        */
+       public function get_registered( $name ) {
+               if ( ! $this->is_registered( $name ) ) {
+                       return null;
+               }
+
+               return $this->registered_block_types[ $name ];
+       }
+
+       /**
+        * Retrieves all registered block types.
+        *
+        * @since 5.0.0
+        *
+        * @return WP_Block_Type[] Associative array of `$block_type_name => $block_type` pairs.
+        */
+       public function get_all_registered() {
+               return $this->registered_block_types;
+       }
+
+       /**
+        * Checks if a block type is registered.
+        *
+        * @since 5.0.0
+        *
+        * @param string $name Block type name including namespace.
+        * @return bool True if the block type is registered, false otherwise.
+        */
+       public function is_registered( $name ) {
+               return isset( $this->registered_block_types[ $name ] );
+       }
+
+       /**
+        * Utility method to retrieve the main instance of the class.
+        *
+        * The instance will be created if it does not exist yet.
+        *
+        * @since 5.0.0
+        *
+        * @return WP_Block_Type_Registry The main instance.
+        */
+       public static function get_instance() {
+               if ( null === self::$instance ) {
+                       self::$instance = new self();
+               }
+
+               return self::$instance;
+       }
+}
</ins></span></pre></div>
<a id="trunksrcwpincludesclasswpblocktypephpfromrev43742branches50srcwpincludesclasswpblocktypephp"></a>
<div class="copfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Copied: trunk/src/wp-includes/class-wp-block-type.php (from rev 43742, branches/5.0/src/wp-includes/class-wp-block-type.php)</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-block-type.php                             (rev 0)
+++ trunk/src/wp-includes/class-wp-block-type.php       2018-12-13 09:43:29 UTC (rev 44108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,205 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * Blocks API: WP_Block_Type class
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ * @since 5.0.0
+ */
+
+/**
+ * Core class representing a block type.
+ *
+ * @since 5.0.0
+ *
+ * @see register_block_type()
+ */
+class WP_Block_Type {
+       /**
+        * Block type key.
+        *
+        * @since 5.0.0
+        * @var string
+        */
+       public $name;
+
+       /**
+        * Block type render callback.
+        *
+        * @since 5.0.0
+        * @var callable
+        */
+       public $render_callback;
+
+       /**
+        * Block type attributes property schemas.
+        *
+        * @since 5.0.0
+        * @var array
+        */
+       public $attributes;
+
+       /**
+        * Block type editor script handle.
+        *
+        * @since 5.0.0
+        * @var string
+        */
+       public $editor_script;
+
+       /**
+        * Block type front end script handle.
+        *
+        * @since 5.0.0
+        * @var string
+        */
+       public $script;
+
+       /**
+        * Block type editor style handle.
+        *
+        * @since 5.0.0
+        * @var string
+        */
+       public $editor_style;
+
+       /**
+        * Block type front end style handle.
+        *
+        * @since 5.0.0
+        * @var string
+        */
+       public $style;
+
+       /**
+        * Constructor.
+        *
+        * Will populate object properties from the provided arguments.
+        *
+        * @since 5.0.0
+        *
+        * @see register_block_type()
+        *
+        * @param string       $block_type Block type name including namespace.
+        * @param array|string $args       Optional. Array or string of arguments for registering a block type.
+        *                                 Default empty array.
+        */
+       public function __construct( $block_type, $args = array() ) {
+               $this->name = $block_type;
+
+               $this->set_props( $args );
+       }
+
+       /**
+        * Renders the block type output for given attributes.
+        *
+        * @since 5.0.0
+        *
+        * @param array  $attributes Optional. Block attributes. Default empty array.
+        * @param string $content    Optional. Block content. Default empty string.
+        * @return string Rendered block type output.
+        */
+       public function render( $attributes = array(), $content = '' ) {
+               if ( ! $this->is_dynamic() ) {
+                       return '';
+               }
+
+               $attributes = $this->prepare_attributes_for_render( $attributes );
+
+               return (string) call_user_func( $this->render_callback, $attributes, $content );
+       }
+
+       /**
+        * Returns true if the block type is dynamic, or false otherwise. A dynamic
+        * block is one which defers its rendering to occur on-demand at runtime.
+        *
+        * @since 5.0.0
+        *
+        * @return boolean Whether block type is dynamic.
+        */
+       public function is_dynamic() {
+               return is_callable( $this->render_callback );
+       }
+
+       /**
+        * Validates attributes against the current block schema, populating
+        * defaulted and missing values, and omitting unknown attributes.
+        *
+        * @since 5.0.0
+        *
+        * @param  array $attributes Original block attributes.
+        * @return array             Prepared block attributes.
+        */
+       public function prepare_attributes_for_render( $attributes ) {
+               if ( ! isset( $this->attributes ) ) {
+                       return $attributes;
+               }
+
+               $prepared_attributes = array();
+
+               foreach ( $this->attributes as $attribute_name => $schema ) {
+                       $value = null;
+
+                       if ( isset( $attributes[ $attribute_name ] ) ) {
+                               $is_valid = rest_validate_value_from_schema( $attributes[ $attribute_name ], $schema );
+                               if ( ! is_wp_error( $is_valid ) ) {
+                                       $value = rest_sanitize_value_from_schema( $attributes[ $attribute_name ], $schema );
+                               }
+                       }
+
+                       if ( is_null( $value ) && isset( $schema['default'] ) ) {
+                               $value = $schema['default'];
+                       }
+
+                       $prepared_attributes[ $attribute_name ] = $value;
+               }
+
+               return $prepared_attributes;
+       }
+
+       /**
+        * Sets block type properties.
+        *
+        * @since 5.0.0
+        *
+        * @param array|string $args Array or string of arguments for registering a block type.
+        */
+       public function set_props( $args ) {
+               $args = wp_parse_args(
+                       $args,
+                       array(
+                               'render_callback' => null,
+                       )
+               );
+
+               $args['name'] = $this->name;
+
+               foreach ( $args as $property_name => $property_value ) {
+                       $this->$property_name = $property_value;
+               }
+       }
+
+       /**
+        * Get all available block attributes including possible layout attribute from Columns block.
+        *
+        * @since 5.0.0
+        *
+        * @return array Array of attributes.
+        */
+       public function get_attributes() {
+               return is_array( $this->attributes ) ?
+                       array_merge(
+                               $this->attributes,
+                               array(
+                                       'layout' => array(
+                                               'type' => 'string',
+                                       ),
+                               )
+                       ) :
+                       array(
+                               'layout' => array(
+                                       'type' => 'string',
+                               ),
+                       );
+       }
+}
</ins></span></pre></div>
<a id="trunksrcwpsettingsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-settings.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-settings.php 2018-12-13 09:37:05 UTC (rev 44107)
+++ trunk/src/wp-settings.php   2018-12-13 09:43:29 UTC (rev 44108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -244,6 +244,9 @@
</span><span class="cx" style="display: block; padding: 0 10px"> require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-user-meta-fields.php' );
</span><span class="cx" style="display: block; padding: 0 10px"> require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-search-handler.php' );
</span><span class="cx" style="display: block; padding: 0 10px"> require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-post-search-handler.php' );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+require( ABSPATH . WPINC . '/class-wp-block-type.php' );
+require( ABSPATH . WPINC . '/class-wp-block-type-registry.php' );
+require( ABSPATH . WPINC . '/blocks.php' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> $GLOBALS['wp_embed'] = new WP_Embed();
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunktestsphpunitincludesbootstrapphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/includes/bootstrap.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/includes/bootstrap.php        2018-12-13 09:37:05 UTC (rev 44107)
+++ trunk/tests/phpunit/includes/bootstrap.php  2018-12-13 09:43:29 UTC (rev 44108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -133,6 +133,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> require dirname( __FILE__ ) . '/utils.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require dirname( __FILE__ ) . '/spy-rest-server.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require dirname( __FILE__ ) . '/class-wp-rest-test-search-handler.php';
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+require dirname( __FILE__ ) . '/class-wp-fake-block-type.php';
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px">  * A child class of the PHP test runner.
</span></span></pre></div>
<a id="trunktestsphpunitincludesclasswpfakeblocktypephpfromrev43742branches50testsphpunitincludesclasswpfakeblocktypephp"></a>
<div class="copfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Copied: trunk/tests/phpunit/includes/class-wp-fake-block-type.php (from rev 43742, branches/5.0/tests/phpunit/includes/class-wp-fake-block-type.php)</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/includes/class-wp-fake-block-type.php                         (rev 0)
+++ trunk/tests/phpunit/includes/class-wp-fake-block-type.php   2018-12-13 09:43:29 UTC (rev 44108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,27 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * WP_Fake_Block_Type for testing
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ * @since 5.0.0
+ */
+
+/**
+ * Test class extending WP_Block_Type
+ *
+ * @since 5.0.0
+ */
+class WP_Fake_Block_Type extends WP_Block_Type {
+
+       /**
+        * Render the fake block.
+        *
+        * @param array  $attributes Optional. Block attributes. Default empty array.
+        * @param string $content    Optional. Block content. Default empty string.
+        * @return string Rendered block HTML.
+        */
+       public function render( $attributes = array(), $content = '' ) {
+               return '<div>' . $content . '</div>';
+       }
+}
</ins></span></pre>
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