<?php
/**
* Server-side rendering of the `core/block` block.
*
* @package WordPress
*/

/**
* Renders the `core/block` block on server.
*
* @since 5.0.0
*
* @global WP_Embed $wp_embed
*
* @param array $attributes The block attributes.
*
* @return string Rendered HTML of the referenced block.
*/
function render_block_core_block( $attributes ) {
static $seen_refs = array();

if ( empty( $attributes['ref'] ) ) {
return '';
}

$reusable_block = get_post( $attributes['ref'] );
if ( ! $reusable_block || 'wp_block' !== $reusable_block->post_type ) {
return '';
}

if ( isset( $seen_refs[ $attributes['ref'] ] ) ) {
// WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent
// is set in `wp_debug_mode()`.
$is_debug = WP_DEBUG && WP_DEBUG_DISPLAY;

return $is_debug ?
// translators: Visible only in the front end, this warning takes the place of a faulty block.
__( '[block rendering halted]' ) :
'';
}

if ( 'publish' !== $reusable_block->post_status || ! empty( $reusable_block->post_password ) ) {
return '';
}

$seen_refs[ $attributes['ref'] ] = true;

// Handle embeds for reusable blocks.
global $wp_embed;
$content = $wp_embed->run_shortcode( $reusable_block->post_content );
$content = $wp_embed->autoembed( $content );

// Back compat.
// For blocks that have not been migrated in the editor, add some back compat
// so that front-end rendering continues to work.

// This matches the `v2` deprecation. Removes the inner `values` property
// from every item.
if ( isset( $attributes['content'] ) ) {
foreach ( $attributes['content'] as &$content_data ) {
if ( isset( $content_data['values'] ) ) {
$is_assoc_array = is_array( $content_data['values'] ) && ! wp_is_numeric_array( $content_data['values'] );

if ( $is_assoc_array ) {
$content_data = $content_data['values'];
}
}
}
}

// This matches the `v1` deprecation. Rename `overrides` to `content`.
if ( isset( $attributes['overrides'] ) && ! isset( $attributes['content'] ) ) {
$attributes['content'] = $attributes['overrides'];
}

/**
* We set the `pattern/overrides` context through the `render_block_context`
* filter so that it is available when a pattern's inner blocks are
* rendering via do_blocks given it only receives the inner content.
*/
$has_pattern_overrides = isset( $attributes['content'] ) && null !== get_block_bindings_source( 'core/pattern-overrides' );
if ( $has_pattern_overrides ) {
$filter_block_context = static function ( $context ) use ( $attributes ) {
$context['pattern/overrides'] = $attributes['content'];
return $context;
};
add_filter( 'render_block_context', $filter_block_context, 1 );
}

$content = do_blocks( $content );
unset( $seen_refs[ $attributes['ref'] ] );

if ( $has_pattern_overrides ) {
remove_filter( 'render_block_context', $filter_block_context, 1 );
}

return $content;
}

/**
* Registers the `core/block` block.
*
* @since 5.3.0
*/
function register_block_core_block() {
register_block_type_from_metadata(
__DIR__ . '/block',
array(
'render_callback' => 'render_block_core_block',
)
);
}
add_action( 'init', 'register_block_core_block' );