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<?php
/**
* Server-side rendering of the `core/template-part` block.
*
* @package WordPress
*/
/**
* Renders the `core/template-part` block on the server.
*
* @since 5.9.0
*
* @global WP_Embed $wp_embed WordPress Embed object.
*
* @param array $attributes The block attributes.
*
* @return string The render.
*/
function render_block_core_template_part( $attributes ) {
static $seen_ids = array();
$template_part_id = null;
$content = null;
$area = WP_TEMPLATE_PART_AREA_UNCATEGORIZED;
$theme = $attributes['theme'] ?? get_stylesheet();
if ( isset( $attributes['slug'] ) && get_stylesheet() === $theme ) {
$template_part_id = $theme . '//' . $attributes['slug'];
$template_part_query = new WP_Query(
array(
'post_type' => 'wp_template_part',
'post_status' => 'publish',
'post_name__in' => array( $attributes['slug'] ),
'tax_query' => array(
array(
'taxonomy' => 'wp_theme',
'field' => 'name',
'terms' => $theme,
),
),
'posts_per_page' => 1,
'no_found_rows' => true,
'lazy_load_term_meta' => false, // Do not lazy load term meta, as template parts only have one term.
)
);
$template_part_post = $template_part_query->have_posts() ? $template_part_query->next_post() : null;
if ( $template_part_post ) {
// A published post might already exist if this template part was customized elsewhere
// or if it's part of a customized template.
$block_template = _build_block_template_result_from_post( $template_part_post );
$content = $block_template->content;
if ( isset( $block_template->area ) ) {
$area = $block_template->area;
}
/**
* Fires when a block template part is loaded from a template post stored in the database.
*
* @since 5.9.0
*
* @param string $template_part_id The requested template part namespaced to the theme.
* @param array $attributes The block attributes.
* @param WP_Post $template_part_post The template part post object.
* @param string $content The template part content.
*/
do_action( 'render_block_core_template_part_post', $template_part_id, $attributes, $template_part_post, $content );
} else {
$template_part_file_path = '';
// Else, if the template part was provided by the active theme,
// render the corresponding file content.
if ( 0 === validate_file( $attributes['slug'] ) ) {
$block_template = get_block_file_template( $template_part_id, 'wp_template_part' );
if ( isset( $block_template->content ) ) {
$content = $block_template->content;
}
if ( isset( $block_template->area ) ) {
$area = $block_template->area;
}
// Needed for the `render_block_core_template_part_file` and `render_block_core_template_part_none` actions below.
$block_template_file = _get_block_template_file( 'wp_template_part', $attributes['slug'] );
if ( $block_template_file ) {
$template_part_file_path = $block_template_file['path'];
}
}
if ( '' !== $content && null !== $content ) {
/**
* Fires when a block template part is loaded from a template part in the theme.
*
* @since 5.9.0
*
* @param string $template_part_id The requested template part namespaced to the theme.
* @param array $attributes The block attributes.
* @param string $template_part_file_path Absolute path to the template path.
* @param string $content The template part content.
*/
do_action( 'render_block_core_template_part_file', $template_part_id, $attributes, $template_part_file_path, $content );
} else {
/**
* Fires when a requested block template part does not exist in the database nor in the theme.
*
* @since 5.9.0
*
* @param string $template_part_id The requested template part namespaced to the theme.
* @param array $attributes The block attributes.
* @param string $template_part_file_path Absolute path to the not found template path.
*/
do_action( 'render_block_core_template_part_none', $template_part_id, $attributes, $template_part_file_path );
}
}
}
// 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;
if ( is_null( $content ) ) {
if ( $is_debug && isset( $attributes['slug'] ) ) {
return sprintf(
/* translators: %s: Template part slug. */
__( 'Template part has been deleted or is unavailable: %s' ),
$attributes['slug']
);
}
return '';
}
if ( isset( $seen_ids[ $template_part_id ] ) ) {
return $is_debug ?
// translators: Visible only in the front end, this warning takes the place of a faulty block.
__( '[block rendering halted]' ) :
'';
}
// Look up area definition.
$area_definition = null;
$defined_areas = get_allowed_block_template_part_areas();
foreach ( $defined_areas as $defined_area ) {
if ( $defined_area['area'] === $area ) {
$area_definition = $defined_area;
break;
}
}
// If $area is not allowed, set it back to the uncategorized default.
if ( ! $area_definition ) {
$area = WP_TEMPLATE_PART_AREA_UNCATEGORIZED;
}
// Run through the actions that are typically taken on the_content.
$content = _wp_apply_block_content_filters( $content, "template_part_{$area}", $seen_ids, $template_part_id );
if ( empty( $attributes['tagName'] ) || tag_escape( $attributes['tagName'] ) !== $attributes['tagName'] ) {
$area_tag = 'div';
if ( $area_definition && isset( $area_definition['area_tag'] ) ) {
$area_tag = $area_definition['area_tag'];
}
$html_tag = $area_tag;
} else {
$html_tag = esc_attr( $attributes['tagName'] );
}
$wrapper_attributes = get_block_wrapper_attributes();
return "<$html_tag $wrapper_attributes>" . str_replace( ']]>', ']]>', $content ) . "</$html_tag>";
}
/**
* Returns an array of area variation objects for the template part block.
*
* @since 6.1.0
*
* @param array $instance_variations The variations for instances.
*
* @return array Array containing the block variation objects.
*/
function build_template_part_block_area_variations( $instance_variations ) {
$variations = array();
$defined_areas = get_allowed_block_template_part_areas();
foreach ( $defined_areas as $area ) {
if ( 'uncategorized' !== $area['area'] && 'navigation-overlay' !== $area['area'] ) {
$has_instance_for_area = false;
foreach ( $instance_variations as $variation ) {
if ( $variation['attributes']['area'] === $area['area'] ) {
$has_instance_for_area = true;
break;
}
}
$scope = $has_instance_for_area ? array() : array( 'inserter' );
$variations[] = array(
'name' => 'area_' . $area['area'],
'title' => $area['label'],
'description' => $area['description'],
'attributes' => array(
'area' => $area['area'],
),
'scope' => $scope,
'icon' => $area['icon'],
);
}
}
return $variations;
}
/**
* Returns an array of instance variation objects for the template part block
*
* @since 6.1.0
*
* @return array Array containing the block variation objects.
*/
function build_template_part_block_instance_variations() {
// Block themes are unavailable during installation.
if ( wp_installing() ) {
return array();
}
if ( ! current_theme_supports( 'block-templates' ) && ! current_theme_supports( 'block-template-parts' ) ) {
return array();
}
$variations = array();
$template_parts = get_block_templates(
array(
'post_type' => 'wp_template_part',
),
'wp_template_part'
);
$defined_areas = get_allowed_block_template_part_areas();
$icon_by_area = array_combine( array_column( $defined_areas, 'area' ), array_column( $defined_areas, 'icon' ) );
foreach ( $template_parts as $template_part ) {
// Navigation overlay template parts should not appear in the
// general inserter. They are managed through the Navigation
// block's overlay template part selector.
$scope = ( 'navigation-overlay' === $template_part->area )
? array()
: array( 'inserter' );
$variations[] = array(
'name' => 'instance_' . sanitize_title( $template_part->slug ),
'title' => $template_part->title,
// If there's no description for the template part don't show the
// block description. This is a bit hacky, but prevent the fallback
// by using a non-breaking space so that the value of description
// isn't falsey.
'description' => $template_part->description || ' ',
'attributes' => array(
'slug' => $template_part->slug,
'theme' => $template_part->theme,
'area' => $template_part->area,
),
'scope' => $scope,
'icon' => $icon_by_area[ $template_part->area ] ?? null,
'example' => array(
'attributes' => array(
'slug' => $template_part->slug,
'theme' => $template_part->theme,
'area' => $template_part->area,
),
),
);
}
return $variations;
}
/**
* Returns an array of all template part block variations.
*
* @since 5.9.0
*
* @return array Array containing the block variation objects.
*/
function build_template_part_block_variations() {
$instance_variations = build_template_part_block_instance_variations();
$area_variations = build_template_part_block_area_variations( $instance_variations );
return array_merge( $area_variations, $instance_variations );
}
/**
* Registers the `core/template-part` block on the server.
*
* @since 5.9.0
*/
function register_block_core_template_part() {
register_block_type_from_metadata(
__DIR__ . '/template-part',
array(
'render_callback' => 'render_block_core_template_part',
'variation_callback' => 'build_template_part_block_variations',
)
);
}
add_action( 'init', 'register_block_core_template_part' );
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