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<?php
/**
* Block template loader functions.
*
* @package WordPress
*/
/**
* Find a block template with equal or higher specificity than a given PHP template file.
*
* Internally, this communicates the block content that needs to be used by the template canvas through a global variable.
*
* @since 5.8.0
*
* @global string $_wp_current_template_content
*
* @param string $template Path to the template. See locate_template().
* @param string $type Sanitized filename without extension.
* @param array $templates A list of template candidates, in descending order of priority.
* @return string The path to the Full Site Editing template canvas file, or the fallback PHP template.
*/
function locate_block_template( $template, $type, array $templates ) {
global $_wp_current_template_content;
if ( $template ) {
/*
* locate_template() has found a PHP template at the path specified by $template.
* That means that we have a fallback candidate if we cannot find a block template
* with higher specificity.
*
* Thus, before looking for matching block themes, we shorten our list of candidate
* templates accordingly.
*/
// Locate the index of $template (without the theme directory path) in $templates.
$relative_template_path = str_replace(
array( get_stylesheet_directory() . '/', get_template_directory() . '/' ),
'',
$template
);
$index = array_search( $relative_template_path, $templates, true );
// If the template hiearchy algorithm has successfully located a PHP template file,
// we will only consider block templates with higher or equal specificity.
$templates = array_slice( $templates, 0, $index + 1 );
}
$block_template = resolve_block_template( $type, $templates );
if ( $block_template ) {
if ( empty( $block_template->content ) && is_user_logged_in() ) {
$_wp_current_template_content =
sprintf(
/* translators: %s: Template title */
__( 'Empty template: %s' ),
$block_template->title
);
} elseif ( ! empty( $block_template->content ) ) {
$_wp_current_template_content = $block_template->content;
}
if ( isset( $_GET['_wp-find-template'] ) ) {
wp_send_json_success( $block_template );
}
} else {
if ( $template ) {
return $template;
}
if ( 'index' === $type ) {
if ( isset( $_GET['_wp-find-template'] ) ) {
wp_send_json_error( array( 'message' => __( 'No matching template found.' ) ) );
}
} else {
return ''; // So that the template loader keeps looking for templates.
}
}
// Add hooks for template canvas.
// Add viewport meta tag.
add_action( 'wp_head', '_block_template_viewport_meta_tag', 0 );
// Render title tag with content, regardless of whether theme has title-tag support.
remove_action( 'wp_head', '_wp_render_title_tag', 1 ); // Remove conditional title tag rendering...
add_action( 'wp_head', '_block_template_render_title_tag', 1 ); // ...and make it unconditional.
// This file will be included instead of the theme's template file.
return ABSPATH . WPINC . '/template-canvas.php';
}
/**
* Return the correct 'wp_template' to render for the request template type.
*
* @access private
* @since 5.8.0
*
* @param string $template_type The current template type.
* @param string[] $template_hierarchy The current template hierarchy, ordered by priority.
* @return WP_Block_Template|null template A template object, or null if none could be found.
*/
function resolve_block_template( $template_type, $template_hierarchy ) {
if ( ! $template_type ) {
return null;
}
if ( empty( $template_hierarchy ) ) {
$template_hierarchy = array( $template_type );
}
$slugs = array_map(
'_strip_template_file_suffix',
$template_hierarchy
);
// Find all potential templates 'wp_template' post matching the hierarchy.
$query = array(
'theme' => wp_get_theme()->get_stylesheet(),
'slug__in' => $slugs,
);
$templates = get_block_templates( $query );
// Order these templates per slug priority.
// Build map of template slugs to their priority in the current hierarchy.
$slug_priorities = array_flip( $slugs );
usort(
$templates,
function ( $template_a, $template_b ) use ( $slug_priorities ) {
return $slug_priorities[ $template_a->slug ] - $slug_priorities[ $template_b->slug ];
}
);
return count( $templates ) ? $templates[0] : null;
}
/**
* Displays title tag with content, regardless of whether theme has title-tag support.
*
* @access private
* @since 5.8.0
*
* @see _wp_render_title_tag()
*/
function _block_template_render_title_tag() {
echo '<title>' . wp_get_document_title() . '</title>' . "\n";
}
/**
* Returns the markup for the current template.
*
* @access private
* @since 5.8.0
*
* @global string $_wp_current_template_content
* @global WP_Embed $wp_embed
*
* @return string Block template markup.
*/
function get_the_block_template_html() {
global $_wp_current_template_content;
global $wp_embed;
if ( ! $_wp_current_template_content ) {
if ( is_user_logged_in() ) {
return '<h1>' . esc_html__( 'No matching template found' ) . '</h1>';
}
return;
}
$content = $wp_embed->run_shortcode( $_wp_current_template_content );
$content = $wp_embed->autoembed( $content );
$content = do_blocks( $content );
$content = wptexturize( $content );
$content = wp_filter_content_tags( $content );
$content = str_replace( ']]>', ']]>', $content );
// Wrap block template in .wp-site-blocks to allow for specific descendant styles
// (e.g. `.wp-site-blocks > *`).
return '<div class="wp-site-blocks">' . $content . '</div>';
}
/**
* Renders a 'viewport' meta tag.
*
* This is hooked into {@see 'wp_head'} to decouple its output from the default template canvas.
*
* @access private
* @since 5.8.0
*/
function _block_template_viewport_meta_tag() {
echo '<meta name="viewport" content="width=device-width, initial-scale=1" />' . "\n";
}
/**
* Strips .php or .html suffix from template file names.
*
* @access private
* @since 5.8.0
*
* @param string $template_file Template file name.
* @return string Template file name without extension.
*/
function _strip_template_file_suffix( $template_file ) {
return preg_replace( '/\.(php|html)$/', '', $template_file );
}
/**
* Removes post details from block context when rendering a block template.
*
* @access private
* @since 5.8.0
*
* @param array $context Default context.
*
* @return array Filtered context.
*/
function _block_template_render_without_post_block_context( $context ) {
/*
* When loading a template directly and not through a page that resolves it,
* the top-level post ID and type context get set to that of the template.
* Templates are just the structure of a site, and they should not be available
* as post context because blocks like Post Content would recurse infinitely.
*/
if ( isset( $context['postType'] ) && 'wp_template' === $context['postType'] ) {
unset( $context['postId'] );
unset( $context['postType'] );
}
return $context;
}