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<?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 API version.
*
* @since 5.6.0
* @var int
*/
public $api_version = 1;
/**
* Block type key.
*
* @since 5.0.0
* @var string
*/
public $name;
/**
* Human-readable block type label.
*
* @since 5.5.0
* @var string
*/
public $title = '';
/**
* Block type category classification, used in search interfaces
* to arrange block types by category.
*
* @since 5.5.0
* @var string|null
*/
public $category = null;
/**
* Setting parent lets a block require that it is only available
* when nested within the specified blocks.
*
* @since 5.5.0
* @var array|null
*/
public $parent = null;
/**
* Setting ancestor makes a block available only inside the specified
* block types at any position of the ancestor's block subtree.
*
* @since 6.0.0
* @var array|null
*/
public $ancestor = null;
/**
* Block type icon.
*
* @since 5.5.0
* @var string|null
*/
public $icon = null;
/**
* A detailed block type description.
*
* @since 5.5.0
* @var string
*/
public $description = '';
/**
* Additional keywords to produce block type as result
* in search interfaces.
*
* @since 5.5.0
* @var string[]
*/
public $keywords = array();
/**
* The translation textdomain.
*
* @since 5.5.0
* @var string|null
*/
public $textdomain = null;
/**
* Alternative block styles.
*
* @since 5.5.0
* @var array
*/
public $styles = array();
/**
* Block variations.
*
* @since 5.8.0
* @var array
*/
public $variations = array();
/**
* Supported features.
*
* @since 5.5.0
* @var array|null
*/
public $supports = null;
/**
* Structured data for the block preview.
*
* @since 5.5.0
* @var array|null
*/
public $example = null;
/**
* Block type render callback.
*
* @since 5.0.0
* @var callable
*/
public $render_callback = null;
/**
* Block type attributes property schemas.
*
* @since 5.0.0
* @var array|null
*/
public $attributes = null;
/**
* Context values inherited by blocks of this type.
*
* @since 5.5.0
* @var array
*/
public $uses_context = array();
/**
* Context provided by blocks of this type.
*
* @since 5.5.0
* @var array|null
*/
public $provides_context = null;
/**
* Block type editor only script handle.
*
* @since 5.0.0
* @var string|null
*/
public $editor_script = null;
/**
* Block type front end and editor script handle.
*
* @since 5.0.0
* @var string|null
*/
public $script = null;
/**
* Block type front end only script handle.
*
* @since 5.9.0
* @var string|null
*/
public $view_script = null;
/**
* Block type editor only style handle.
*
* @since 5.0.0
* @var string|null
*/
public $editor_style = null;
/**
* Block type front end and editor style handle.
*
* @since 5.0.0
* @var string|null
*/
public $style = null;
/**
* Attributes supported by every block.
*
* @since 6.0.0
* @var array
*/
const GLOBAL_ATTRIBUTES = array(
'lock' => array( 'type' => 'object' ),
);
/**
* Constructor.
*
* Will populate object properties from the provided arguments.
*
* @since 5.0.0
* @since 5.5.0 Added the `title`, `category`, `parent`, `icon`, `description`,
* `keywords`, `textdomain`, `styles`, `supports`, `example`,
* `uses_context`, and `provides_context` properties.
* @since 5.6.0 Added the `api_version` property.
* @since 5.8.0 Added the `variations` property.
* @since 5.9.0 Added the `view_script` property.
* @since 6.0.0 Added the `ancestor` property.
*
* @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. Any arguments may be defined,
* however the ones described below are supported by default. Default empty array.
*
* @type string $api_version Block API version.
* @type string $title Human-readable block type label.
* @type string|null $category Block type category classification, used in
* search interfaces to arrange block types by category.
* @type array|null $parent Setting parent lets a block require that it is only
* available when nested within the specified blocks.
* @type array|null $ancestor Setting ancestor makes a block available only inside the specified
* block types at any position of the ancestor's block subtree.
* @type string|null $icon Block type icon.
* @type string $description A detailed block type description.
* @type string[] $keywords Additional keywords to produce block type as
* result in search interfaces.
* @type string|null $textdomain The translation textdomain.
* @type array $styles Alternative block styles.
* @type array $variations Block variations.
* @type array|null $supports Supported features.
* @type array|null $example Structured data for the block preview.
* @type callable|null $render_callback Block type render callback.
* @type array|null $attributes Block type attributes property schemas.
* @type array $uses_context Context values inherited by blocks of this type.
* @type array|null $provides_context Context provided by blocks of this type.
* @type string|null $editor_script Block type editor only script handle.
* @type string|null $script Block type front end and editor script handle.
* @type string|null $view_script Block type front end only script handle.
* @type string|null $editor_style Block type editor only style handle.
* @type string|null $style Block type front end and editor style handle.
* }
*/
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 bool 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.
*
* @since 5.0.0
*
* @param array $attributes Original block attributes.
* @return array Prepared block attributes.
*/
public function prepare_attributes_for_render( $attributes ) {
// If there are no attribute definitions for the block type, skip
// processing and return verbatim.
if ( ! isset( $this->attributes ) ) {
return $attributes;
}
foreach ( $attributes as $attribute_name => $value ) {
// If the attribute is not defined by the block type, it cannot be
// validated.
if ( ! isset( $this->attributes[ $attribute_name ] ) ) {
continue;
}
$schema = $this->attributes[ $attribute_name ];
// Validate value by JSON schema. An invalid value should revert to
// its default, if one exists. This occurs by virtue of the missing
// attributes loop immediately following. If there is not a default
// assigned, the attribute value should remain unset.
$is_valid = rest_validate_value_from_schema( $value, $schema, $attribute_name );
if ( is_wp_error( $is_valid ) ) {
unset( $attributes[ $attribute_name ] );
}
}
// Populate values of any missing attributes for which the block type
// defines a default.
$missing_schema_attributes = array_diff_key( $this->attributes, $attributes );
foreach ( $missing_schema_attributes as $attribute_name => $schema ) {
if ( isset( $schema['default'] ) ) {
$attributes[ $attribute_name ] = $schema['default'];
}
}
return $attributes;
}
/**
* Sets block type properties.
*
* @since 5.0.0
*
* @param array|string $args Array or string of arguments for registering a block type.
* See WP_Block_Type::__construct() for information on accepted arguments.
*/
public function set_props( $args ) {
$args = wp_parse_args(
$args,
array(
'render_callback' => null,
)
);
$args['name'] = $this->name;
// Setup attributes if needed.
if ( ! isset( $args['attributes'] ) || ! is_array( $args['attributes'] ) ) {
$args['attributes'] = array();
}
// Register core attributes.
foreach ( static::GLOBAL_ATTRIBUTES as $attr_key => $attr_schema ) {
if ( ! array_key_exists( $attr_key, $args['attributes'] ) ) {
$args['attributes'][ $attr_key ] = $attr_schema;
}
}
/**
* Filters the arguments for registering a block type.
*
* @since 5.5.0
*
* @param array $args Array of arguments for registering a block type.
* @param string $block_type Block type name including namespace.
*/
$args = apply_filters( 'register_block_type_args', $args, $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 ) ?
$this->attributes :
array();
}
}
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