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<?php
/**
* Functions related to registering and parsing blocks.
*
* @package WordPress
* @subpackage Blocks
* @since 5.0.0
*/
/**
* 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.
* }
* @return WP_Block_Type|false The registered block type on success, or false on failure.
*/
function register_block_type( $name, $args = array() ) {
return WP_Block_Type_Registry::get_instance()->register( $name, $args );
}
/**
* 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.
*/
function unregister_block_type( $name ) {
return WP_Block_Type_Registry::get_instance()->unregister( $name );
}
/**
* 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, '<!-- sp:' );
}
/**
* 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, '<!-- sp:' . $block_type . ' ' );
}
/**
* Returns an array of the names of all registered dynamic block types.
*
* @since 5.0.0
*
* @return array Array of dynamic block names.
*/
function get_dynamic_block_names() {
$dynamic_block_names = array();
$block_types = WP_Block_Type_Registry::get_instance()->get_all_registered();
foreach ( $block_types as $block_type ) {
if ( $block_type->is_dynamic() ) {
$dynamic_block_names[] = $block_type->name;
}
}
return $dynamic_block_names;
}
/**
* Given an array of attributes, returns a string in the serialized attributes
* format prepared for post content.
*
* The serialized result is a JSON-encoded string, with unicode escape sequence
* substitution for characters which might otherwise interfere with embedding
* the result in an HTML comment.
*
* @since 5.3.1
*
* @param array $block_attributes Attributes object.
* @return string Serialized attributes.
*/
function serialize_block_attributes( $block_attributes ) {
$encoded_attributes = json_encode( $block_attributes );
$encoded_attributes = preg_replace( '/--/', '\\u002d\\u002d', $encoded_attributes );
$encoded_attributes = preg_replace( '/</', '\\u003c', $encoded_attributes );
$encoded_attributes = preg_replace( '/>/', '\\u003e', $encoded_attributes );
$encoded_attributes = preg_replace( '/&/', '\\u0026', $encoded_attributes );
// Regex: /\\"/
$encoded_attributes = preg_replace( '/\\\\"/', '\\u0022', $encoded_attributes );
return $encoded_attributes;
}
/**
* Returns the block name to use for serialization. This will remove the default
* "core/" namespace from a block name.
*
* @since 5.3.1
*
* @param string $block_name Original block name.
* @return string Block name to use for serialization.
*/
function strip_core_block_namespace( $block_name = null ) {
if ( is_string( $block_name ) && 0 === strpos( $block_name, 'core/' ) ) {
return substr( $block_name, 5 );
}
return $block_name;
}
/**
* Returns the content of a block, including comment delimiters.
*
* @since 5.3.1
*
* @param string $block_name Block name.
* @param array $block_attributes Block attributes.
* @param string $block_content Block save content.
* @return string Comment-delimited block content.
*/
function get_comment_delimited_block_content( $block_name, $block_attributes, $block_content ) {
if ( is_null( $block_name ) ) {
return $block_content;
}
$serialized_block_name = strip_core_block_namespace( $block_name );
$serialized_attributes = empty( $block_attributes ) ? '' : serialize_block_attributes( $block_attributes ) . ' ';
if ( empty( $block_content ) ) {
return sprintf( '<!-- sp:%s %s/-->', $serialized_block_name, $serialized_attributes );
}
return sprintf(
'<!-- sp:%s %s-->%s<!-- /sp:%s -->',
$serialized_block_name,
$serialized_attributes,
$block_content,
$serialized_block_name
);
}
/**
* Returns the content of a block, including comment delimiters, serializing all
* attributes from the given parsed block.
*
* This should be used when preparing a block to be saved to post content.
* Prefer `render_block` when preparing a block for display. Unlike
* `render_block`, this does not evaluate a block's `render_callback`, and will
* instead preserve the markup as parsed.
*
* @since 5.3.1
*
* @param WP_Block_Parser_Block $block A single parsed block object.
* @return string String of rendered HTML.
*/
function serialize_block( $block ) {
$block_content = '';
$index = 0;
foreach ( $block['innerContent'] as $chunk ) {
$block_content .= is_string( $chunk ) ? $chunk : serialize_block( $block['innerBlocks'][ $index++ ] );
}
if ( ! is_array( $block['attrs'] ) ) {
$block['attrs'] = array();
}
return get_comment_delimited_block_content(
$block['blockName'],
$block['attrs'],
$block_content
);
}
/**
* Returns a joined string of the aggregate serialization of the given parsed
* blocks.
*
* @since 5.3.1
*
* @param WP_Block_Parser_Block[] $blocks Parsed block objects.
* @return string String of rendered HTML.
*/
function serialize_blocks( $blocks ) {
return implode( '', array_map( 'serialize_block', $blocks ) );
}
/**
* Parses blocks out of a content string, and renders those appropriate for the excerpt.
*
* As the excerpt should be a small string of text relevant to the full post content,
* this function renders the blocks that are most likely to contain such text.
*
* @since 5.0.0
*
* @param string $content The content to parse.
* @return string The parsed and filtered content.
*/
function excerpt_remove_blocks( $content ) {
$allowed_blocks = array(
// Classic blocks have their blockName set to null.
null,
'core/columns',
'core/freeform',
'core/heading',
'core/html',
'core/list',
'core/media-text',
'core/paragraph',
'core/preformatted',
'core/pullquote',
'core/quote',
'core/table',
'core/verse',
);
/**
* Filters the list of blocks that can contribute to the excerpt.
*
* If a dynamic block is added to this list, it must not generate another
* excerpt, as this will cause an infinite loop to occur.
*
* @since 4.4.0
*
* @param array $allowed_blocks The list of allowed blocks.
*/
$allowed_blocks = apply_filters( 'excerpt_allowed_blocks', $allowed_blocks );
$blocks = parse_blocks( $content );
$output = '';
foreach ( $blocks as $block ) {
if ( in_array( $block['blockName'], $allowed_blocks, true ) ) {
$output .= render_block( $block );
}
}
return $output;
}
/**
* Renders a single block into a HTML string.
*
* @since 5.0.0
*
* @global WP_Post $post The post to edit.
*
* @param array $block A single parsed block object.
* @return string String of rendered HTML.
*/
function render_block( $block ) {
global $post;
/**
* Allows render_block() to be shortcircuited, by returning a non-null value.
*
* @since 5.1.0
*
* @param string $pre_render The pre-rendered content. Default null.
* @param array $block The block being rendered.
*/
$pre_render = apply_filters( 'pre_render_block', null, $block );
if ( ! is_null( $pre_render ) ) {
return $pre_render;
}
$source_block = $block;
/**
* Filters the block being rendered in render_block(), before it's processed.
*
* @since 5.1.0
*
* @param array $block The block being rendered.
* @param array $source_block An un-modified copy of $block, as it appeared in the source content.
*/
$block = apply_filters( 'render_block_data', $block, $source_block );
$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
$is_dynamic = $block['blockName'] && null !== $block_type && $block_type->is_dynamic();
$block_content = '';
$index = 0;
foreach ( $block['innerContent'] as $chunk ) {
$block_content .= is_string( $chunk ) ? $chunk : render_block( $block['innerBlocks'][ $index++ ] );
}
if ( ! is_array( $block['attrs'] ) ) {
$block['attrs'] = array();
}
if ( $is_dynamic ) {
$global_post = $post;
$block_content = $block_type->render( $block['attrs'], $block_content );
$post = $global_post;
}
/**
* Filters the content of a single block.
*
* @since 5.0.0
*
* @param string $block_content The block content about to be appended.
* @param array $block The full block, including name and attributes.
*/
return apply_filters( 'render_block', $block_content, $block );
}
/**
* Parses blocks out of a content string.
*
* @since 5.0.0
*
* @param string $content Post content.
* @return array Array of parsed block objects.
*/
function parse_blocks( $content ) {
/**
* Filter to allow plugins to replace the server-side block parser
*
* @since 5.0.0
*
* @param string $parser_class Name of block parser class.
*/
$parser_class = apply_filters( 'block_parser_class', 'WP_Block_Parser' );
$parser = new $parser_class();
return $parser->parse( $content );
}
/**
* Parses dynamic blocks out of `post_content` and re-renders them.
*
* @since 5.0.0
* @global WP_Post $post The post to edit.
*
* @param string $content Post content.
* @return string Updated post content.
*/
function do_blocks( $content ) {
// If there are blocks in this content, we shouldn't run wpautop() on it later.
$priority = has_filter( 'the_content', 'wpautop' );
if ( false !== $priority && doing_filter( 'the_content' ) && has_blocks( $content ) ) {
remove_filter( 'the_content', 'wpautop', $priority );
add_filter( 'the_content', '_restore_wpautop_hook', $priority + 1 );
}
$blocks = parse_blocks( $content );
$output = '';
foreach ( $blocks as $block ) {
$output .= render_block( $block );
}
return $output;
}
/**
* If do_blocks() needs to remove wp_autop() from the `the_content` filter, this re-adds it afterwards,
* for subsequent `the_content` usage.
*
* @access private
*
* @since 5.0.0
*
* @param string $content The post content running through this filter.
* @return string The unmodified content.
*/
function _restore_wpautop_hook( $content ) {
$current_priority = has_filter( 'the_content', '_restore_wpautop_hook' );
add_filter( 'the_content', 'wpautop', $current_priority - 1 );
remove_filter( 'the_content', '_restore_wpautop_hook', $current_priority );
return $content;
}
/**
* Returns the current version of the block format that the content string is using.
*
* If the string doesn't contain blocks, it returns 0.
*
* @since 5.0.0
*
* @param string $content Content to test.
* @return int The block format version is 1 if the content contains one or more blocks, 0 otherwise.
*/
function block_version( $content ) {
return has_blocks( $content ) ? 1 : 0;
}