alidating 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, '', $serialized_block_name, $serialized_attributes ); } return sprintf( '%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 ) ); } /** * Filters and sanitizes block content to remove non-allowable HTML from * parsed block attribute values. * * @since 5.3.1 * * @param string $text Text that may contain block content. * @param array[]|string $allowed_html An array of allowed HTML elements * and attributes, or a context name * such as 'post'. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string The filtered and sanitized content result. */ function filter_block_content( $text, $allowed_html = 'post', $allowed_protocols = array() ) { $result = ''; $blocks = parse_blocks( $text ); foreach ( $blocks as $block ) { $block = filter_block_kses( $block, $allowed_html, $allowed_protocols ); $result .= serialize_block( $block ); } return $result; } /** * Filters and sanitizes a parsed block to remove non-allowable HTML from block * attribute values. * * @since 5.3.1 * * @param WP_Block_Parser_Block $block The parsed block object. * @param array[]|string $allowed_html An array of allowed HTML * elements and attributes, or a * context name such as 'post'. * @param string[] $allowed_protocols Allowed URL protocols. * @return array The filtered and sanitized block object result. */ function filter_block_kses( $block, $allowed_html, $allowed_protocols = array() ) { $block['attrs'] = filter_block_kses_value( $block['attrs'], $allowed_html, $allowed_protocols ); if ( is_array( $block['innerBlocks'] ) ) { foreach ( $block['innerBlocks'] as $i => $inner_block ) { $block['innerBlocks'][ $i ] = filter_block_kses( $inner_block, $allowed_html, $allowed_protocols ); } } return $block; } /** * Filters and sanitizes a parsed block attribute value to remove non-allowable * HTML. * * @since 5.3.1 * * @param string[]|string $value The attribute value to filter. * @param array[]|string $allowed_html An array of allowed HTML elements * and attributes, or a context name * such as 'post'. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string[]|string The filtered and sanitized result. */ function filter_block_kses_value( $value, $allowed_html, $allowed_protocols = array() ) { if ( is_array( $value ) ) { foreach ( $value as $key => $inner_value ) { $filtered_key = filter_block_kses_value( $key, $allowed_html, $allowed_protocols ); $filtered_value = filter_block_kses_value( $inner_value, $allowed_html, $allowed_protocols ); if ( $filtered_key !== $key ) { unset( $value[ $key ] ); } $value[ $filtered_key ] = $filtered_value; } } elseif ( is_string( $value ) ) { return wp_kses( $value, $allowed_html, $allowed_protocols ); } return $value; } /** * 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_inner_blocks = array( // Classic blocks have their blockName set to null. null, 'core/freeform', 'core/heading', 'core/html', 'core/list', 'core/media-text', 'core/paragraph', 'core/preformatted', 'core/pullquote', 'core/quote', 'core/table', 'core/verse', ); $allowed_blocks = array_merge( $allowed_inner_blocks, array( 'core/columns' ) ); /** * 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 5.0.0 * * @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 ) ) { if ( ! empty( $block['innerBlocks'] ) ) { if ( 'core/columns' === $block['blockName'] ) { $output .= _excerpt_render_inner_columns_blocks( $block, $allowed_inner_blocks ); continue; } // Skip the block if it has disallowed or nested inner blocks. foreach ( $block['innerBlocks'] as $inner_block ) { if ( ! in_array( $inner_block['blockName'], $allowed_inner_blocks, true ) || ! empty( $inner_block['innerBlocks'] ) ) { continue 2; } } } $output .= render_block( $block ); } } return $output; } /** * Render inner blocks from the `core/columns` block for generating an excerpt. * * @since 5.2.0 * @access private * * @param array $columns The parsed columns block. * @param array $allowed_blocks The list of allowed inner blocks. * @return string The rendered inner blocks. */ function _excerpt_render_inner_columns_blocks( $columns, $allowed_blocks ) { $output = ''; foreach ( $columns['innerBlocks'] as $column ) { foreach ( $column['innerBlocks'] as $inner_block ) { if ( in_array( $inner_block['blockName'], $allowed_blocks, true ) && empty( $inner_block['innerBlocks'] ) ) { $output .= render_block( $inner_block ); } } } return $output; } /** * Renders a single block into a HTML string. * * @since 5.0.0 * * @global WP_Post $post The post to edit. * @global WP_Query $wp_query WordPress Query object. * * @param array $parsed_block A single parsed block object. * @return string String of rendered HTML. */ function render_block( $parsed_block ) { global $post, $wp_query; /** * Allows render_block() to be short-circuited, by returning a non-null value. * * @since 5.1.0 * * @param string|null $pre_render The pre-rendered content. Default null. * @param array $parsed_block The block being rendered. */ $pre_render = apply_filters( 'pre_render_block', null, $parsed_block ); if ( ! is_null( $pre_render ) ) { return $pre_render; } $source_block = $parsed_block; /** * Filters the block being rendered in render_block(), before it's processed. * * @since 5.1.0 * * @param array $parsed_block The block being rendered. * @param array $source_block An un-modified copy of $parsed_block, as it appeared in the source content. */ $parsed_block = apply_filters( 'render_block_data', $parsed_block, $source_block ); $context = array(); if ( $post instanceof WP_Post ) { $context['postId'] = $post->ID; /* * The `postType` context is largely unnecessary server-side, since the ID * is usually sufficient on its own. That being said, since a block's * manifest is expected to be shared between the server and the client, * it should be included to consistently fulfill the expectation. */ $context['postType'] = $post->post_type; } if ( $wp_query instanceof WP_Query && isset( $wp_query->tax_query->queried_terms['category'] ) ) { $context['query'] = array( 'categoryIds' => array() ); foreach ( $wp_query->tax_query->queried_terms['category']['terms'] as $category_slug_or_id ) { $context['query']['categoryIds'][] = 'slug' === $wp_query->tax_query->queried_terms['category']['field'] ? get_cat_ID( $category_slug_or_id ) : $category_slug_or_id; } } /** * Filters the default context provided to a rendered block. * * @since 5.5.0 * * @param array $context Default context. * @param array $parsed_block Block being rendered, filtered by `render_block_data`. */ $context = apply_filters( 'render_block_context', $context, $parsed_block ); $block = new WP_Block( $parsed_block, $context ); return $block->render(); } /** * 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 * * @param string $content Post content. * @return string Updated post content. */ function do_blocks( $content ) { $blocks = parse_blocks( $content ); $output = ''; foreach ( $blocks as $block ) { $output .= render_block( $block ); } // 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 ); } return $output; } /** * If do_blocks() needs to remove wpautop() 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; } /** * Registers a new block style. * * @since 5.3.0 * * @param string $block_name Block type name including namespace. * @param array $style_properties Array containing the properties of the style name, * label, style (name of the stylesheet to be enqueued), * inline_style (string containing the CSS to be added). * @return bool True if the block style was registered with success and false otherwise. */ function register_block_style( $block_name, $style_properties ) { return WP_Block_Styles_Registry::get_instance()->register( $block_name, $style_properties ); } /** * Unregisters a block style. * * @since 5.3.0 * * @param string $block_name Block type name including namespace. * @param array $block_style_name Block style name. * @return bool True if the block style was unregistered with success and false otherwise. */ function unregister_block_style( $block_name, $block_style_name ) { return WP_Block_Styles_Registry::get_instance()->unregister( $block_name, $block_style_name ); }