361 lines
12 KiB
PHP
361 lines
12 KiB
PHP
<?php
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/**
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* Block template loader functions.
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*
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* @package WordPress
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*/
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/**
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* Adds necessary hooks to resolve '_wp-find-template' requests.
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*
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* @access private
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* @since 5.9.0
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*/
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function _add_template_loader_filters() {
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if ( isset( $_GET['_wp-find-template'] ) && current_theme_supports( 'block-templates' ) ) {
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add_action( 'pre_get_posts', '_resolve_template_for_new_post' );
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}
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}
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/**
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* Finds a block template with equal or higher specificity than a given PHP template file.
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*
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* Internally, this communicates the block content that needs to be used by the template canvas through a global variable.
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*
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* @since 5.8.0
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* @since 6.3.0 Added `$_wp_current_template_id` global for editing of current template directly from the admin bar.
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*
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* @global string $_wp_current_template_content
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* @global string $_wp_current_template_id
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*
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* @param string $template Path to the template. See locate_template().
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* @param string $type Sanitized filename without extension.
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* @param string[] $templates A list of template candidates, in descending order of priority.
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* @return string The path to the Site Editor template canvas file, or the fallback PHP template.
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*/
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function locate_block_template( $template, $type, array $templates ) {
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global $_wp_current_template_content, $_wp_current_template_id;
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if ( ! current_theme_supports( 'block-templates' ) ) {
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return $template;
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}
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if ( $template ) {
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/*
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* locate_template() has found a PHP template at the path specified by $template.
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* That means that we have a fallback candidate if we cannot find a block template
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* with higher specificity.
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*
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* Thus, before looking for matching block themes, we shorten our list of candidate
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* templates accordingly.
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*/
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// Locate the index of $template (without the theme directory path) in $templates.
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$relative_template_path = str_replace(
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array( get_stylesheet_directory() . '/', get_template_directory() . '/' ),
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'',
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$template
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);
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$index = array_search( $relative_template_path, $templates, true );
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// If the template hierarchy algorithm has successfully located a PHP template file,
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// we will only consider block templates with higher or equal specificity.
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$templates = array_slice( $templates, 0, $index + 1 );
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}
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$block_template = resolve_block_template( $type, $templates, $template );
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if ( $block_template ) {
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$_wp_current_template_id = $block_template->id;
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if ( empty( $block_template->content ) && is_user_logged_in() ) {
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$_wp_current_template_content =
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sprintf(
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/* translators: %s: Template title */
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__( 'Empty template: %s' ),
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$block_template->title
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);
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} elseif ( ! empty( $block_template->content ) ) {
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$_wp_current_template_content = $block_template->content;
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}
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if ( isset( $_GET['_wp-find-template'] ) ) {
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wp_send_json_success( $block_template );
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}
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} else {
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if ( $template ) {
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return $template;
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}
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if ( 'index' === $type ) {
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if ( isset( $_GET['_wp-find-template'] ) ) {
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wp_send_json_error( array( 'message' => __( 'No matching template found.' ) ) );
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}
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} else {
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return ''; // So that the template loader keeps looking for templates.
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}
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}
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// Add hooks for template canvas.
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// Add viewport meta tag.
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add_action( 'wp_head', '_block_template_viewport_meta_tag', 0 );
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// Render title tag with content, regardless of whether theme has title-tag support.
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remove_action( 'wp_head', '_wp_render_title_tag', 1 ); // Remove conditional title tag rendering...
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add_action( 'wp_head', '_block_template_render_title_tag', 1 ); // ...and make it unconditional.
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// This file will be included instead of the theme's template file.
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return ABSPATH . WPINC . '/template-canvas.php';
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}
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/**
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* Returns the correct 'wp_template' to render for the request template type.
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*
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* @access private
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* @since 5.8.0
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* @since 5.9.0 Added the `$fallback_template` parameter.
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*
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* @param string $template_type The current template type.
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* @param string[] $template_hierarchy The current template hierarchy, ordered by priority.
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* @param string $fallback_template A PHP fallback template to use if no matching block template is found.
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* @return WP_Block_Template|null template A template object, or null if none could be found.
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*/
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function resolve_block_template( $template_type, $template_hierarchy, $fallback_template ) {
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if ( ! $template_type ) {
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return null;
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}
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if ( empty( $template_hierarchy ) ) {
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$template_hierarchy = array( $template_type );
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}
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$slugs = array_map(
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'_strip_template_file_suffix',
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$template_hierarchy
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);
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// Find all potential templates 'wp_template' post matching the hierarchy.
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$query = array(
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'slug__in' => $slugs,
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);
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$templates = get_block_templates( $query );
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// Order these templates per slug priority.
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// Build map of template slugs to their priority in the current hierarchy.
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$slug_priorities = array_flip( $slugs );
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usort(
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$templates,
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static function ( $template_a, $template_b ) use ( $slug_priorities ) {
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return $slug_priorities[ $template_a->slug ] - $slug_priorities[ $template_b->slug ];
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}
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);
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$theme_base_path = get_stylesheet_directory() . DIRECTORY_SEPARATOR;
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$parent_theme_base_path = get_template_directory() . DIRECTORY_SEPARATOR;
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// Is the active theme a child theme, and is the PHP fallback template part of it?
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if (
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str_starts_with( $fallback_template, $theme_base_path ) &&
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! str_contains( $fallback_template, $parent_theme_base_path )
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) {
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$fallback_template_slug = substr(
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$fallback_template,
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// Starting position of slug.
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strpos( $fallback_template, $theme_base_path ) + strlen( $theme_base_path ),
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// Remove '.php' suffix.
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-4
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);
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// Is our candidate block template's slug identical to our PHP fallback template's?
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if (
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count( $templates ) &&
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$fallback_template_slug === $templates[0]->slug &&
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'theme' === $templates[0]->source
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) {
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// Unfortunately, we cannot trust $templates[0]->theme, since it will always
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// be set to the active theme's slug by _build_block_template_result_from_file(),
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// even if the block template is really coming from the active theme's parent.
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// (The reason for this is that we want it to be associated with the active theme
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// -- not its parent -- once we edit it and store it to the DB as a wp_template CPT.)
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// Instead, we use _get_block_template_file() to locate the block template file.
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$template_file = _get_block_template_file( 'wp_template', $fallback_template_slug );
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if ( $template_file && get_template() === $template_file['theme'] ) {
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// The block template is part of the parent theme, so we
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// have to give precedence to the child theme's PHP template.
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array_shift( $templates );
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}
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}
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}
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return count( $templates ) ? $templates[0] : null;
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}
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/**
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* Displays title tag with content, regardless of whether theme has title-tag support.
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*
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* @access private
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* @since 5.8.0
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*
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* @see _wp_render_title_tag()
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*/
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function _block_template_render_title_tag() {
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echo '<title>' . wp_get_document_title() . '</title>' . "\n";
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}
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/**
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* Returns the markup for the current template.
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*
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* @access private
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* @since 5.8.0
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*
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* @global string $_wp_current_template_id
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* @global string $_wp_current_template_content
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* @global WP_Embed $wp_embed WordPress Embed object.
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* @global WP_Query $wp_query WordPress Query object.
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*
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* @return string Block template markup.
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*/
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function get_the_block_template_html() {
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global $_wp_current_template_id, $_wp_current_template_content, $wp_embed, $wp_query;
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if ( ! $_wp_current_template_content ) {
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if ( is_user_logged_in() ) {
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return '<h1>' . esc_html__( 'No matching template found' ) . '</h1>';
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}
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return;
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}
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$content = $wp_embed->run_shortcode( $_wp_current_template_content );
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$content = $wp_embed->autoembed( $content );
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$content = shortcode_unautop( $content );
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$content = do_shortcode( $content );
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/*
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* Most block themes omit the `core/query` and `core/post-template` blocks in their singular content templates.
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* While this technically still works since singular content templates are always for only one post, it results in
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* the main query loop never being entered which causes bugs in core and the plugin ecosystem.
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*
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* The workaround below ensures that the loop is started even for those singular templates. The while loop will by
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* definition only go through a single iteration, i.e. `do_blocks()` is only called once. Additional safeguard
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* checks are included to ensure the main query loop has not been tampered with and really only encompasses a
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* single post.
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*
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* Even if the block template contained a `core/query` and `core/post-template` block referencing the main query
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* loop, it would not cause errors since it would use a cloned instance and go through the same loop of a single
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* post, within the actual main query loop.
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*
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* This special logic should be skipped if the current template does not come from the current theme, in which case
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* it has been injected by a plugin by hijacking the block template loader mechanism. In that case, entirely custom
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* logic may be applied which is unpredictable and therefore safer to omit this special handling on.
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*/
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if (
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$_wp_current_template_id &&
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str_starts_with( $_wp_current_template_id, get_stylesheet() . '//' ) &&
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is_singular() &&
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1 === $wp_query->post_count &&
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have_posts()
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) {
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while ( have_posts() ) {
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the_post();
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$content = do_blocks( $content );
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}
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} else {
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$content = do_blocks( $content );
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}
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$content = wptexturize( $content );
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$content = convert_smilies( $content );
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$content = wp_filter_content_tags( $content, 'template' );
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$content = str_replace( ']]>', ']]>', $content );
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// Wrap block template in .wp-site-blocks to allow for specific descendant styles
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// (e.g. `.wp-site-blocks > *`).
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return '<div class="wp-site-blocks">' . $content . '</div>';
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}
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/**
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* Renders a 'viewport' meta tag.
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*
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* This is hooked into {@see 'wp_head'} to decouple its output from the default template canvas.
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*
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* @access private
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* @since 5.8.0
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*/
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function _block_template_viewport_meta_tag() {
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echo '<meta name="viewport" content="width=device-width, initial-scale=1" />' . "\n";
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}
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/**
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* Strips .php or .html suffix from template file names.
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*
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* @access private
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* @since 5.8.0
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*
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* @param string $template_file Template file name.
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* @return string Template file name without extension.
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*/
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function _strip_template_file_suffix( $template_file ) {
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return preg_replace( '/\.(php|html)$/', '', $template_file );
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}
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/**
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* Removes post details from block context when rendering a block template.
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*
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* @access private
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* @since 5.8.0
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*
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* @param array $context Default context.
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*
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* @return array Filtered context.
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*/
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function _block_template_render_without_post_block_context( $context ) {
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/*
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* When loading a template directly and not through a page that resolves it,
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* the top-level post ID and type context get set to that of the template.
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* Templates are just the structure of a site, and they should not be available
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* as post context because blocks like Post Content would recurse infinitely.
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*/
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if ( isset( $context['postType'] ) && 'wp_template' === $context['postType'] ) {
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unset( $context['postId'] );
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unset( $context['postType'] );
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}
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return $context;
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}
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/**
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* Sets the current WP_Query to return auto-draft posts.
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*
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* The auto-draft status indicates a new post, so allow the the WP_Query instance to
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* return an auto-draft post for template resolution when editing a new post.
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*
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* @access private
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* @since 5.9.0
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*
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* @param WP_Query $wp_query Current WP_Query instance, passed by reference.
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*/
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function _resolve_template_for_new_post( $wp_query ) {
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if ( ! $wp_query->is_main_query() ) {
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return;
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}
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remove_filter( 'pre_get_posts', '_resolve_template_for_new_post' );
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// Pages.
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$page_id = isset( $wp_query->query['page_id'] ) ? $wp_query->query['page_id'] : null;
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// Posts, including custom post types.
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$p = isset( $wp_query->query['p'] ) ? $wp_query->query['p'] : null;
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$post_id = $page_id ? $page_id : $p;
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$post = get_post( $post_id );
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if (
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$post &&
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'auto-draft' === $post->post_status &&
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current_user_can( 'edit_post', $post->ID )
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) {
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$wp_query->set( 'post_status', 'auto-draft' );
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}
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}
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