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<title>[48159] trunk: Editor: Introduce WP_Block and WP_Block_List 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/48159">48159</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/48159","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>gziolo</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2020-06-25 05:14:43 +0000 (Thu, 25 Jun 2020)</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'>Editor: Introduce WP_Block and WP_Block_List classes

Backports functionality added in Gutenberg in the following PRs:
- https://github.com/WordPress/gutenberg/pull/21467
- https://github.com/WordPress/gutenberg/pull/21925
It's a few ideas related to block rendering and the provided block value, which is particularly impactful for work around block context.

Props aduth, TimothyBJacobs, noisysocks, epiqueras, youknowriad, talldanwp, zebulan.
Fixes <a href="https://core.trac.wordpress.org/ticket/49926">#49926</a>.</pre>

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

<h3>Added Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpblocklistphp">trunk/src/wp-includes/class-wp-block-list.php</a></li>
<li><a href="#trunksrcwpincludesclasswpblockphp">trunk/src/wp-includes/class-wp-block.php</a></li>
<li><a href="#trunktestsphpunittestsblocksblocklistphp">trunk/tests/phpunit/tests/blocks/block-list.php</a></li>
<li><a href="#trunktestsphpunittestsblocksblockphp">trunk/tests/phpunit/tests/blocks/block.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpblocklistphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/src/wp-includes/class-wp-block-list.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-block-list.php                             (rev 0)
+++ trunk/src/wp-includes/class-wp-block-list.php       2020-06-25 05:14:43 UTC (rev 48159)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,203 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * Blocks API: WP_Block_List class
+ *
+ * @package WordPress
+ * @since 5.5.0
+ */
+
+/**
+ * Class representing a list of block instances.
+ *
+ * @since 5.5.0
+ */
+class WP_Block_List implements Iterator, ArrayAccess, Countable {
+
+       /**
+        * Original array of parsed block data, or block instances.
+        *
+        * @since 5.5.0
+        * @var array[]|WP_Block[]
+        * @access protected
+        */
+       protected $blocks;
+
+       /**
+        * All available context of the current hierarchy.
+        *
+        * @since 5.5.0
+        * @var array
+        * @access protected
+        */
+       protected $available_context;
+
+       /**
+        * Block type registry to use in constructing block instances.
+        *
+        * @since 5.5.0
+        * @var WP_Block_Type_Registry
+        * @access protected
+        */
+       protected $registry;
+
+       /**
+        * Constructor.
+        *
+        * Populates object properties from the provided block instance argument.
+        *
+        * @since 5.5.0
+        *
+        * @param array[]|WP_Block[]     $blocks            Array of parsed block data, or block instances.
+        * @param array                  $available_context Optional array of ancestry context values.
+        * @param WP_Block_Type_Registry $registry          Optional block type registry.
+        */
+       public function __construct( $blocks, $available_context = array(), $registry = null ) {
+               if ( ! $registry instanceof WP_Block_Type_Registry ) {
+                       $registry = WP_Block_Type_Registry::get_instance();
+               }
+
+               $this->blocks            = $blocks;
+               $this->available_context = $available_context;
+               $this->registry          = $registry;
+       }
+
+       /**
+        * Returns true if a block exists by the specified block index, or false
+        * otherwise.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/arrayaccess.offsetexists.php
+        *
+        * @param string $index Index of block to check.
+        * @return bool Whether block exists.
+        */
+       public function offsetExists( $index ) {
+               return isset( $this->blocks[ $index ] );
+       }
+
+       /**
+        * Returns the value by the specified block index.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/arrayaccess.offsetget.php
+        *
+        * @param string $index Index of block value to retrieve.
+        * @return mixed|null Block value if exists, or null.
+        */
+       public function offsetGet( $index ) {
+               $block = $this->blocks[ $index ];
+
+               if ( isset( $block ) && is_array( $block ) ) {
+                       $block                  = new WP_Block( $block, $this->available_context, $this->registry );
+                       $this->blocks[ $index ] = $block;
+               }
+
+               return $block;
+       }
+
+       /**
+        * Assign a block value by the specified block index.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/arrayaccess.offsetset.php
+        *
+        * @param string $index Index of block value to set.
+        * @param mixed  $value Block value.
+        */
+       public function offsetSet( $index, $value ) {
+               if ( is_null( $index ) ) {
+                       $this->blocks[] = $value;
+               } else {
+                       $this->blocks[ $index ] = $value;
+               }
+       }
+
+       /**
+        * Unset a block.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/arrayaccess.offsetunset.php
+        *
+        * @param string $index Index of block value to unset.
+        */
+       public function offsetUnset( $index ) {
+               unset( $this->blocks[ $index ] );
+       }
+
+       /**
+        * Rewinds back to the first element of the Iterator.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/iterator.rewind.php
+        */
+       public function rewind() {
+               reset( $this->blocks );
+       }
+
+       /**
+        * Returns the current element of the block list.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/iterator.current.php
+        *
+        * @return mixed Current element.
+        */
+       public function current() {
+               return $this->offsetGet( $this->key() );
+       }
+
+       /**
+        * Returns the key of the current element of the block list.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/iterator.key.php
+        *
+        * @return mixed Key of the current element.
+        */
+       public function key() {
+               return key( $this->blocks );
+       }
+
+       /**
+        * Moves the current position of the block list to the next element.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/iterator.next.php
+        */
+       public function next() {
+               next( $this->blocks );
+       }
+
+       /**
+        * Checks if current position is valid.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/iterator.valid.php
+        */
+       public function valid() {
+               return null !== key( $this->blocks );
+       }
+
+       /**
+        * Returns the count of blocks in the list.
+        *
+        * @since 5.5.0
+        *
+        * @link https://www.php.net/manual/en/countable.count.php
+        *
+        * @return int Block count.
+        */
+       public function count() {
+               return count( $this->blocks );
+       }
+
+}
</ins></span></pre></div>
<a id="trunksrcwpincludesclasswpblockphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/src/wp-includes/class-wp-block.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-block.php                          (rev 0)
+++ trunk/src/wp-includes/class-wp-block.php    2020-06-25 05:14:43 UTC (rev 48159)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,233 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * Blocks API: WP_Block class
+ *
+ * @package WordPress
+ * @since 5.5.0
+ */
+
+/**
+ * Class representing a parsed instance of a block.
+ *
+ * @since 5.5.0
+ * @property array $attributes
+ */
+class WP_Block {
+
+       /**
+        * Original parsed array representation of block.
+        *
+        * @since 5.5.0
+        * @var array
+        */
+       public $parsed_block;
+
+       /**
+        * Name of block.
+        *
+        * @example "core/paragraph"
+        *
+        * @since 5.5.0
+        * @var string
+        */
+       public $name;
+
+       /**
+        * Block type associated with the instance.
+        *
+        * @since 5.5.0
+        * @var WP_Block_Type
+        */
+       public $block_type;
+
+       /**
+        * Block context values.
+        *
+        * @since 5.5.0
+        * @var array
+        */
+       public $context = array();
+
+       /**
+        * All available context of the current hierarchy.
+        *
+        * @since 5.5.0
+        * @var array
+        * @access protected
+        */
+       protected $available_context;
+
+       /**
+        * List of inner blocks (of this same class)
+        *
+        * @since 5.5.0
+        * @var WP_Block[]
+        */
+       public $inner_blocks = array();
+
+       /**
+        * Resultant HTML from inside block comment delimiters after removing inner
+        * blocks.
+        *
+        * @example "...Just <!-- wp:test /--> testing..." -> "Just testing..."
+        *
+        * @since 5.5.0
+        * @var string
+        */
+       public $inner_html = '';
+
+       /**
+        * List of string fragments and null markers where inner blocks were found
+        *
+        * @example array(
+        *   'inner_html'    => 'BeforeInnerAfter',
+        *   'inner_blocks'  => array( block, block ),
+        *   'inner_content' => array( 'Before', null, 'Inner', null, 'After' ),
+        * )
+        *
+        * @since 5.5.0
+        * @var array
+        */
+       public $inner_content = array();
+
+       /**
+        * Constructor.
+        *
+        * Populates object properties from the provided block instance argument.
+        *
+        * The given array of context values will not necessarily be available on
+        * the instance itself, but is treated as the full set of values provided by
+        * the block's ancestry. This is assigned to the private `available_context`
+        * property. Only values which are configured to consumed by the block via
+        * its registered type will be assigned to the block's `context` property.
+        *
+        * @since 5.5.0
+        *
+        * @param array                  $block             Array of parsed block properties.
+        * @param array                  $available_context Optional array of ancestry context values.
+        * @param WP_Block_Type_Registry $registry          Optional block type registry.
+        */
+       public function __construct( $block, $available_context = array(), $registry = null ) {
+               $this->parsed_block = $block;
+               $this->name         = $block['blockName'];
+
+               if ( is_null( $registry ) ) {
+                       $registry = WP_Block_Type_Registry::get_instance();
+               }
+
+               $this->block_type = $registry->get_registered( $this->name );
+
+               $this->available_context = $available_context;
+
+               if ( ! empty( $this->block_type->uses_context ) ) {
+                       foreach ( $this->block_type->uses_context as $context_name ) {
+                               if ( array_key_exists( $context_name, $this->available_context ) ) {
+                                       $this->context[ $context_name ] = $this->available_context[ $context_name ];
+                               }
+                       }
+               }
+
+               if ( ! empty( $block['innerBlocks'] ) ) {
+                       $child_context = $this->available_context;
+
+                       if ( ! empty( $this->block_type->provides_context ) ) {
+                               foreach ( $this->block_type->provides_context as $context_name => $attribute_name ) {
+                                       if ( array_key_exists( $attribute_name, $this->attributes ) ) {
+                                               $child_context[ $context_name ] = $this->attributes[ $attribute_name ];
+                                       }
+                               }
+                       }
+
+                       $this->inner_blocks = new WP_Block_List( $block['innerBlocks'], $child_context, $registry );
+               }
+
+               if ( ! empty( $block['innerHTML'] ) ) {
+                       $this->inner_html = $block['innerHTML'];
+               }
+
+               if ( ! empty( $block['innerContent'] ) ) {
+                       $this->inner_content = $block['innerContent'];
+               }
+       }
+
+       /**
+        * Returns a value from an inaccessible property.
+        *
+        * This is used to lazily initialize the `attributes` property of a block,
+        * such that it is only prepared with default attributes at the time that
+        * the property is accessed. For all other inaccessible properties, a `null`
+        * value is returned.
+        *
+        * @since 5.5.0
+        *
+        * @param string $name Property name.
+        * @return array|null Prepared attributes, or null.
+        */
+       public function __get( $name ) {
+               if ( 'attributes' === $name ) {
+                       $this->attributes = isset( $this->parsed_block['attrs'] ) ?
+                               $this->parsed_block['attrs'] :
+                               array();
+
+                       if ( ! is_null( $this->block_type ) ) {
+                               $this->attributes = $this->block_type->prepare_attributes_for_render( $this->attributes );
+                       }
+
+                       return $this->attributes;
+               }
+
+               return null;
+       }
+
+       /**
+        * Generates the render output for the block.
+        *
+        * @since 5.5.0
+        *
+        * @param array $options {
+        *   Optional options object.
+        *
+        *   @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback.
+        * }
+        * @return string Rendered block output.
+        */
+       public function render( $options = array() ) {
+               global $post;
+               $options = wp_parse_args(
+                       $options,
+                       array(
+                               'dynamic' => true,
+                       )
+               );
+
+               $is_dynamic    = $options['dynamic'] && $this->name && null !== $this->block_type && $this->block_type->is_dynamic();
+               $block_content = '';
+
+               if ( ! $options['dynamic'] || empty( $this->block_type->skip_inner_blocks ) ) {
+                       $index = 0;
+                       foreach ( $this->inner_content as $chunk ) {
+                               $block_content .= is_string( $chunk ) ?
+                                       $chunk :
+                                       $this->inner_blocks[ $index++ ]->render();
+                       }
+               }
+
+               if ( $is_dynamic ) {
+                       $global_post   = $post;
+                       $block_content = (string) call_user_func( $this->block_type->render_callback, $this->attributes, $block_content, $this );
+                       $post          = $global_post;
+               }
+
+               if ( ! empty( $this->block_type->script ) ) {
+                       wp_enqueue_script( $this->block_type->script );
+               }
+
+               if ( ! empty( $this->block_type->style ) ) {
+                       wp_enqueue_style( $this->block_type->style );
+               }
+
+               /** This filter is documented in src/wp-includes/blocks.php */
+               return apply_filters( 'render_block', $block_content, $this->parsed_block );
+       }
+
+}
</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 2020-06-24 22:04:36 UTC (rev 48158)
+++ trunk/src/wp-settings.php   2020-06-25 05:14:43 UTC (rev 48159)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -278,6 +278,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-block-patterns-registry.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-block-styles-registry.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-block-type-registry.php';
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+require ABSPATH . WPINC . '/class-wp-block.php';
+require ABSPATH . WPINC . '/class-wp-block-list.php';
</ins><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-block-parser.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/blocks.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/blocks/archives.php';
</span></span></pre></div>
<a id="trunktestsphpunittestsblocksblocklistphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/tests/phpunit/tests/blocks/block-list.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/blocks/block-list.php                           (rev 0)
+++ trunk/tests/phpunit/tests/blocks/block-list.php     2020-06-25 05:14:43 UTC (rev 48159)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,112 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * WP_Block_List tests.
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ * @since 5.5.0
+ */
+
+/**
+ * Tests for WP_Block_List
+ *
+ * @since 5.5.0
+ *
+ * @group blocks
+ */
+class WP_Block_List_Test extends WP_UnitTestCase {
+
+       /**
+        * Fake block type registry.
+        *
+        * @var WP_Block_Type_Registry
+        */
+       private $registry = null;
+
+       /**
+        * Set up each test method.
+        */
+       public function setUp() {
+               parent::setUp();
+
+               $this->registry = new WP_Block_Type_Registry();
+               $this->registry->register( 'core/example', array() );
+       }
+
+       /**
+        * Tear down each test method.
+        */
+       public function tearDown() {
+               parent::tearDown();
+
+               $this->registry = null;
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_array_access() {
+               $parsed_blocks = parse_blocks( '<!-- wp:example /-->' );
+               $context       = array();
+               $blocks        = new WP_Block_List( $parsed_blocks, $context, $this->registry );
+
+               // Test "offsetExists".
+               $this->assertTrue( isset( $blocks[0] ) );
+
+               // Test "offsetGet".
+               $this->assertEquals( 'core/example', $blocks[0]->name );
+
+               // Test "offsetSet".
+               $parsed_blocks[0]['blockName'] = 'core/updated';
+               $blocks[0]                     = new WP_Block( $parsed_blocks[0], $context, $this->registry );
+               $this->assertEquals( 'core/updated', $blocks[0]->name );
+
+               // Test "offsetUnset".
+               unset( $blocks[0] );
+               $this->assertFalse( isset( $blocks[0] ) );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_iterable() {
+               $parsed_blocks = parse_blocks( '<!-- wp:example --><!-- wp:example /--><!-- /wp:example -->' );
+               $context       = array();
+               $blocks        = new WP_Block_List( $parsed_blocks, $context, $this->registry );
+               $assertions    = 0;
+
+               foreach ( $blocks as $block ) {
+                       $this->assertEquals( 'core/example', $block->name );
+                       $assertions++;
+                       foreach ( $block->inner_blocks as $inner_block ) {
+                               $this->assertEquals( 'core/example', $inner_block->name );
+                               $assertions++;
+                       }
+               }
+
+               $blocks->rewind();
+               while ( $blocks->valid() ) {
+                       $key   = $blocks->key();
+                       $block = $blocks->current();
+                       $this->assertEquals( 0, $key );
+                       $assertions++;
+                       $this->assertEquals( 'core/example', $block->name );
+                       $assertions++;
+                       $blocks->next();
+               }
+
+               $this->assertEquals( 4, $assertions );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_countable() {
+               $parsed_blocks = parse_blocks( '<!-- wp:example /-->' );
+               $context       = array();
+               $blocks        = new WP_Block_List( $parsed_blocks, $context, $this->registry );
+
+               $this->assertEquals( 1, count( $blocks ) );
+       }
+
+}
</ins></span></pre></div>
<a id="trunktestsphpunittestsblocksblockphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/tests/phpunit/tests/blocks/block.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/blocks/block.php                                (rev 0)
+++ trunk/tests/phpunit/tests/blocks/block.php  2020-06-25 05:14:43 UTC (rev 48159)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,397 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * WP_Block Tests
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ * @since 5.5.0
+ */
+
+/**
+ * Tests for WP_Block
+ *
+ * @since 5.5.0
+ *
+ * @group blocks
+ */
+class WP_Block_Test extends WP_UnitTestCase {
+
+       /**
+        * Fake block type registry.
+        *
+        * @var WP_Block_Type_Registry
+        */
+       private $registry = null;
+
+       /**
+        * Set up each test method.
+        */
+       public function setUp() {
+               parent::setUp();
+
+               $this->registry = new WP_Block_Type_Registry();
+       }
+
+       /**
+        * Tear down each test method.
+        */
+       public function tearDown() {
+               parent::tearDown();
+
+               $this->registry = null;
+       }
+
+       function filter_render_block( $content, $parsed_block ) {
+               return 'Original: "' . $content . '", from block "' . $parsed_block['blockName'] . '"';
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_constructor_assigns_properties_from_parsed_block() {
+               $this->registry->register( 'core/example', array() );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:example {"ok":true} -->a<!-- wp:example /-->b<!-- /wp:example -->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array();
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertSame( $parsed_block, $block->parsed_block );
+               $this->assertEquals( $parsed_block['blockName'], $block->name );
+               $this->assertEquals( $parsed_block['attrs'], $block->attributes );
+               $this->assertEquals( $parsed_block['innerContent'], $block->inner_content );
+               $this->assertEquals( $parsed_block['innerHTML'], $block->inner_html );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_constructor_assigns_block_type_from_registry() {
+               $block_type_settings = array(
+                       'attributes' => array(
+                               'defaulted' => array(
+                                       'type'    => 'number',
+                                       'default' => 10,
+                               ),
+                       ),
+               );
+               $this->registry->register( 'core/example', $block_type_settings );
+
+               $parsed_block = array( 'blockName' => 'core/example' );
+               $context      = array();
+               $block        = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertInstanceOf( WP_Block_Type::class, $block->block_type );
+               $this->assertEquals(
+                       $block_type_settings['attributes'],
+                       $block->block_type->attributes
+               );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_lazily_assigns_attributes_with_defaults() {
+               $this->registry->register(
+                       'core/example',
+                       array(
+                               'attributes' => array(
+                                       'defaulted' => array(
+                                               'type'    => 'number',
+                                               'default' => 10,
+                                       ),
+                               ),
+                       )
+               );
+
+               $parsed_block = array(
+                       'blockName' => 'core/example',
+                       'attrs'     => array(
+                               'explicit' => 20,
+                       ),
+               );
+               $context      = array();
+               $block        = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertEquals(
+                       array(
+                               'defaulted' => 10,
+                               'explicit'  => 20,
+                       ),
+                       $block->attributes
+               );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_lazily_assigns_attributes_with_only_defaults() {
+               $this->registry->register(
+                       'core/example',
+                       array(
+                               'attributes' => array(
+                                       'defaulted' => array(
+                                               'type'    => 'number',
+                                               'default' => 10,
+                                       ),
+                               ),
+                       )
+               );
+
+               $parsed_block = array(
+                       'blockName' => 'core/example',
+                       'attrs'     => array(),
+               );
+               $context      = array();
+               $block        = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertEquals( array( 'defaulted' => 10 ), $block->attributes );
+               // Intentionally call a second time, to ensure property was assigned.
+               $this->assertEquals( array( 'defaulted' => 10 ), $block->attributes );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_constructor_assigns_context_from_block_type() {
+               $this->registry->register(
+                       'core/example',
+                       array(
+                               'uses_context' => array( 'requested' ),
+                       )
+               );
+
+               $parsed_block = array( 'blockName' => 'core/example' );
+               $context      = array(
+                       'requested'   => 'included',
+                       'unrequested' => 'not included',
+               );
+               $block        = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertEquals( array( 'requested' => 'included' ), $block->context );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_constructor_maps_inner_blocks() {
+               $this->registry->register( 'core/example', array() );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:example {"ok":true} -->a<!-- wp:example /-->b<!-- /wp:example -->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array();
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertCount( 1, $block->inner_blocks );
+               $this->assertInstanceOf( WP_Block::class, $block->inner_blocks[0] );
+               $this->assertEquals( 'core/example', $block->inner_blocks[0]->name );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_constructor_prepares_context_for_inner_blocks() {
+               $this->registry->register(
+                       'core/outer',
+                       array(
+                               'attributes'       => array(
+                                       'recordId' => array(
+                                               'type' => 'number',
+                                       ),
+                               ),
+                               'provides_context' => array(
+                                       'core/recordId' => 'recordId',
+                               ),
+                       )
+               );
+               $this->registry->register(
+                       'core/inner',
+                       array(
+                               'uses_context' => array( 'core/recordId' ),
+                       )
+               );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:outer {"recordId":10} --><!-- wp:inner /--><!-- /wp:outer -->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array( 'unrequested' => 'not included' );
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertCount( 0, $block->context );
+               $this->assertEquals(
+                       array( 'core/recordId' => 10 ),
+                       $block->inner_blocks[0]->context
+               );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_constructor_assigns_merged_context() {
+               $this->registry->register(
+                       'core/example',
+                       array(
+                               'attributes'       => array(
+                                       'value' => array(
+                                               'type' => array( 'string', 'null' ),
+                                       ),
+                               ),
+                               'provides_context' => array(
+                                       'core/value' => 'value',
+                               ),
+                               'uses_context'     => array( 'core/value' ),
+                       )
+               );
+
+               $parsed_blocks = parse_blocks(
+                       '<!-- wp:example {"value":"merged"} -->' .
+                       '<!-- wp:example {"value":null} -->' .
+                       '<!-- wp:example /-->' .
+                       '<!-- /wp:example -->' .
+                       '<!-- /wp:example -->'
+               );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array( 'core/value' => 'original' );
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertEquals(
+                       array( 'core/value' => 'original' ),
+                       $block->context
+               );
+               $this->assertEquals(
+                       array( 'core/value' => 'merged' ),
+                       $block->inner_blocks[0]->context
+               );
+               $this->assertEquals(
+                       array( 'core/value' => null ),
+                       $block->inner_blocks[0]->inner_blocks[0]->context
+               );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_render_static_block_type_returns_own_content() {
+               $this->registry->register( 'core/static', array() );
+               $this->registry->register(
+                       'core/dynamic',
+                       array(
+                               'render_callback' => function() {
+                                       return 'b';
+                               },
+                       )
+               );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:static -->a<!-- wp:dynamic /-->c<!-- /wp:static -->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array();
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertSame( 'abc', $block->render() );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_render_passes_block_for_render_callback() {
+               $this->registry->register(
+                       'core/greeting',
+                       array(
+                               'render_callback' => function( $attributes, $content, $block ) {
+                                       return sprintf( 'Hello from %s', $block->name );
+                               },
+                       )
+               );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:greeting /-->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array();
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertSame( 'Hello from core/greeting', $block->render() );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_render_applies_render_block_filter() {
+               $this->registry->register( 'core/example', array() );
+
+               add_filter( 'render_block', array( $this, 'filter_render_block' ), 10, 2 );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:example -->Static<!-- wp:example -->Inner<!-- /wp:example --><!-- /wp:example -->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array();
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $rendered_content = $block->render();
+
+               remove_filter( 'render_block', array( $this, 'filter_render_block' ) );
+
+               $this->assertSame( 'Original: "StaticOriginal: "Inner", from block "core/example"", from block "core/example"', $rendered_content );
+
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_passes_attributes_to_render_callback() {
+               $this->registry->register(
+                       'core/greeting',
+                       array(
+                               'attributes'      => array(
+                                       'toWhom'      => array(
+                                               'type' => 'string',
+                                       ),
+                                       'punctuation' => array(
+                                               'type'    => 'string',
+                                               'default' => '!',
+                                       ),
+                               ),
+                               'render_callback' => function( $block_attributes ) {
+                                       return sprintf(
+                                               'Hello %s%s',
+                                               $block_attributes['toWhom'],
+                                               $block_attributes['punctuation']
+                                       );
+                               },
+                       )
+               );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:greeting {"toWhom":"world"} /-->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array();
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertSame( 'Hello world!', $block->render() );
+       }
+
+       /**
+        * @ticket 49927
+        */
+       function test_passes_content_to_render_callback() {
+               $this->registry->register(
+                       'core/outer',
+                       array(
+                               'render_callback' => function( $block_attributes, $content ) {
+                                       return $content;
+                               },
+                       )
+               );
+               $this->registry->register(
+                       'core/inner',
+                       array(
+                               'render_callback' => function() {
+                                       return 'b';
+                               },
+                       )
+               );
+
+               $parsed_blocks = parse_blocks( '<!-- wp:outer -->a<!-- wp:inner /-->c<!-- /wp:outer -->' );
+               $parsed_block  = $parsed_blocks[0];
+               $context       = array();
+               $block         = new WP_Block( $parsed_block, $context, $this->registry );
+
+               $this->assertSame( 'abc', $block->render() );
+       }
+
+}
</ins></span></pre>
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