<?php
/**
* APIs to interact with global settings & styles.
*
* @package WordPress
*/
/**
* Gets the settings resulting of merging core, theme, and user data.
*
* @since 5.9.0
*
* @param array $path Path to the specific setting to retrieve. Optional.
* If empty, will return all settings.
* @param array $context {
* Metadata to know where to retrieve the $path from. Optional.
*
* @type string $block_name Which block to retrieve the settings from.
* If empty, it'll return the settings for the global context.
* @type string $origin Which origin to take data from.
* Valid values are 'all' (core, theme, and user) or 'base' (core and theme).
* If empty or unknown, 'all' is used.
* }
* @return mixed The settings array or individual setting value to retrieve.
*/
function wp_get_global_settings( $path = array(), $context = array() ) {
if ( ! empty( $context['block_name'] ) ) {
$new_path = array( 'blocks', $context['block_name'] );
foreach ( $path as $subpath ) {
$new_path[] = $subpath;
}
$path = $new_path;
}
/*
* This is the default value when no origin is provided or when it is 'all'.
*
* The $origin is used as part of the cache key. Changes here need to account
* for clearing the cache appropriately.
*/
$origin = 'custom';
if (
! wp_theme_has_theme_json() ||
( isset( $context['origin'] ) && 'base' === $context['origin'] )
) {
$origin = 'theme';
}
/*
* By using the 'theme_json' group, this data is marked to be non-persistent across requests.
* See `wp_cache_add_non_persistent_groups` in src/wp-includes/load.php and other places.
*
* The rationale for this is to make sure derived data from theme.json
* is always fresh from the potential modifications done via hooks
* that can use dynamic data (modify the stylesheet depending on some option,
* settings depending on user permissions, etc.).
* See some of the existing hooks to modify theme.json behavior:
* https://make.wordpress.org/core/2022/10/10/filters-for-theme-json-data/
*
* A different alternative considered was to invalidate the cache upon certain
* events such as options add/update/delete, user meta, etc.
* It was judged not enough, hence this approach.
* See https://github.com/WordPress/gutenberg/pull/45372
*/
$cache_group = 'theme_json';
$cache_key = 'wp_get_global_settings_' . $origin;
/*
* Ignore cache when the development mode is set to 'theme', so it doesn't interfere with the theme
* developer's workflow.
*/
$can_use_cached = ! wp_is_development_mode( 'theme' );
$settings = false;
if ( $can_use_cached ) {
$settings = wp_cache_get( $cache_key, $cache_group );
}
if ( false === $settings ) {
$settings = WP_Theme_JSON_Resolver::get_merged_data( $origin )->get_settings();
if ( $can_use_cached ) {
wp_cache_set( $cache_key, $settings, $cache_group );
}
}
return _wp_array_get( $settings, $path, $settings );
}
/**
* Gets the styles resulting of merging core, theme, and user data.
*
* @since 5.9.0
* @since 6.3.0 the internal link format "var:preset|color|secondary" is resolved
* to "var(--wp--preset--font-size--small)" so consumers don't have to.
* @since 6.3.0 `transforms` is now usable in the `context` parameter. In case [`transforms`]['resolve_variables']
* is defined, variables are resolved to their value in the styles.
*
* @param array $path Path to the specific style to retrieve. Optional.
* If empty, will return all styles.
* @param array $context {
* Metadata to know where to retrieve the $path from. Optional.
*
* @type string $block_name Which block to retrieve the styles from.
* If empty, it'll return the styles for the global context.
* @type string $origin Which origin to take data from.
* Valid values are 'all' (core, theme, and user) or 'base' (core and theme).
* If empty or unknown, 'all' is used.
* @type array $transforms Which transformation(s) to apply.
* Valid value is array( 'resolve-variables' ).
* If defined, variables are resolved to their value in the styles.
* }
* @return mixed The styles array or individual style value to retrieve.
*/
function wp_get_global_styles( $path = array(), $context = array() ) {
if ( ! empty( $context['block_name'] ) ) {
$path = array_merge( array( 'blocks', $context['block_name'] ), $path );
}
$origin = 'custom';
if ( isset( $context['origin'] ) && 'base' === $context['origin'] ) {
$origin = 'theme';
}
$resolve_variables = isset( $context['transforms'] )
&& is_array( $context['transforms'] )
&& in_array( 'resolve-variables', $context['transforms'], true );
$merged_data = WP_Theme_JSON_Resolver::get_merged_data( $origin );
if ( $resolve_variables ) {
$merged_data = WP_Theme_JSON::resolve_variables( $merged_data );
}
$styles = $merged_data->get_raw_data()['styles'];
return _wp_array_get( $styles, $path, $styles );
}
/**
* Returns the stylesheet resulting of merging core, theme, and user data.
*
* @since 5.9.0
* @since 6.1.0 Added 'base-layout-styles' support.
* @since 6.6.0 Resolves relative paths in theme.json styles to theme absolute paths.
*
* @param array $types Optional. Types of styles to load.
* See {@see 'WP_Theme_JSON::get_stylesheet'} for all valid types.
* If empty, it'll load the following:
* - for themes without theme.json: 'variables', 'presets', 'base-layout-styles'.
* - for themes with theme.json: 'variables', 'presets', 'styles'.
* @return string Stylesheet.
*/
function wp_get_global_stylesheet( $types = array() ) {
/*
* Ignore cache when the development mode is set to 'theme', so it doesn't interfere with the theme
* developer's workflow.
*/
$can_use_cached = empty( $types ) && ! wp_is_development_mode( 'theme' );
/*
* By using the 'theme_json' group, this data is marked to be non-persistent across requests.
* @see `wp_cache_add_non_persistent_groups()`.
*
* The rationale for this is to make sure derived data from theme.json
* is always fresh from the potential modifications done via hooks
* that can use dynamic data (modify the stylesheet depending on some option,
* settings depending on user permissions, etc.).
* See some of the existing hooks to modify theme.json behavior:
* @see https://make.wordpress.org/core/2022/10/10/filters-for-theme-json-data/
*
* A different alternative considered was to invalidate the cache upon certain
* events such as options add/update/delete, user meta, etc.
* It was judged not enough, hence this approach.
* @see https://github.com/WordPress/gutenberg/pull/45372
*/
$cache_group = 'theme_json';
$cache_key = 'wp_get_global_stylesheet';
if ( $can_use_cached ) {
$cached = wp_cache_get( $cache_key, $cache_group );
if ( $cached ) {
return $cached;
}
}
$tree = WP_Theme_JSON_Resolver::resolve_theme_file_uris( WP_Theme_JSON_Resolver::get_merged_data() );
$supports_theme_json = wp_theme_has_theme_json();
if ( empty( $types ) && ! $supports_theme_json ) {
$types = array( 'variables', 'presets', 'base-layout-styles' );
} elseif ( empty( $types ) ) {
$types = array( 'variables', 'styles', 'presets' );
}
/*
* If variables are part of the stylesheet, then add them.
* This is so themes without a theme.json still work as before 5.9:
* they can override the default presets.
* See https://core.trac.wordpress.org/ticket/54782
*/
$styles_variables = '';
if ( in_array( 'variables', $types, true ) ) {
/*
* Only use the default, theme, and custom origins. Why?
* Because styles for `blocks` origin are added at a later phase
* (i.e. in the render cycle). Here, only the ones in use are rendered.
* @see wp_add_global_styles_for_blocks
*/
$origins = array( 'default', 'theme', 'custom' );
$styles_variables = $tree->get_stylesheet( array( 'variables' ), $origins );
$types = array_diff( $types, array( 'variables' ) );
}
/*
* For the remaining types (presets, styles), we do consider origins:
*
* - themes without theme.json: only the classes for the presets defined by core
* - themes with theme.json: the presets and styles classes, both from core and the theme
*/
$styles_rest = '';
if ( ! empty( $types ) ) {
/*
* Only use the default, theme, and custom origins. Why?
* Because styles for `blocks` origin are added at a later phase
* (i.e. in the render cycle). Here, only the ones in use are rendered.
* @see wp_add_global_styles_for_blocks
*/
$origins = array( 'default', 'theme', 'custom' );
/*
* If the theme doesn't have theme.json but supports both appearance tools and color palette,
* the 'theme' origin should be included so color palette presets are also output.
*/
if ( ! $supports_theme_json && ( current_theme_supports( 'appearance-tools' ) || current_theme_supports( 'border' ) ) && current_theme_supports( 'editor-color-palette' ) ) {
$origins = array( 'default', 'theme' );
} elseif ( ! $supports_theme_json ) {
$origins = array( 'default' );
}
$styles_rest = $tree->get_stylesheet( $types, $origins );
}
$stylesheet = $styles_variables . $styles_rest;
if ( $can_use_cached ) {
wp_cache_set( $cache_key, $stylesheet, $cache_group );
}
return $stylesheet;
}
/**
* Adds global style rules to the inline style for each block.
*
* @since 6.1.0
* @since 6.7.0 Resolve relative paths in block styles.
*
* @global WP_Styles $wp_styles
*/
function wp_add_global_styles_for_blocks() {
global $wp_styles;
$tree = WP_Theme_JSON_Resolver::get_merged_data();
$tree = WP_Theme_JSON_Resolver::resolve_theme_file_uris( $tree );
$block_nodes = $tree->get_styles_block_nodes();
$can_use_cached = ! wp_is_development_mode( 'theme' );
$update_cache = false;
if ( $can_use_cached ) {
// Hash the merged WP_Theme_JSON data to bust cache on settings or styles change.
$cache_hash = md5( wp_json_encode( $tree->get_raw_data() ) );
$cache_key = 'wp_styles_for_blocks';
$cached = get_transient( $cache_key );
// Reset the cached data if there is no value or if the hash has changed.
if ( ! is_array( $cached ) || $cached['hash'] !== $cache_hash ) {
$cached = array(
'hash' => $cache_hash,
'blocks' => array(),
);
// Update the cache if the hash has changed.
$update_cache = true;
}
}
foreach ( $block_nodes as $metadata ) {
if ( $can_use_cached ) {
// Use the block name as the key for cached CSS data. Otherwise, use a hash of the metadata.
$cache_node_key = isset( $metadata['name'] ) ? $metadata['name'] : md5( wp_json_encode( $metadata ) );
if ( isset( $cached['blocks'][ $cache_node_key ] ) ) {
$block_css = $cached['blocks'][ $cache_node_key ];
} else {
$block_css = $tree->get_styles_for_block( $metadata );
$cached['blocks'][ $cache_node_key ] = $block_css;
// Update the cache if the cache contents have changed.
$update_cache = true;
}
} else {
$block_css = $tree->get_styles_for_block( $metadata );
}
if ( ! wp_should_load_block_assets_on_demand() ) {
wp_add_inline_style( 'global-styles', $block_css );
continue;
}
$stylesheet_handle = 'global-styles';
/*
* When `wp_should_load_block_assets_on_demand()` is true, block styles are
* enqueued for each block on the page in class WP_Block's render function.
* This means there will be a handle in the styles queue for each of those blocks.
* Block-specific global styles should be attached to the global-styles handle, but
* only for blocks on the page, thus we check if the block's handle is in the queue
* before adding the inline style.
* This conditional loading only applies to core blocks.
* TODO: Explore how this could be expanded to third-party blocks as well.
*/
if ( isset( $metadata['name'] ) ) {
if ( str_starts_with( $metadata['name'], 'core/' ) ) {
$block_name = str_replace( 'core/', '', $metadata['name'] );
$block_handle = 'wp-block-' . $block_name;
if ( in_array( $block_handle, $wp_styles->queue, true ) ) {
wp_add_inline_style( $stylesheet_handle, $block_css );
}
} else {
wp_add_inline_style( $stylesheet_handle, $block_css );
}
}
// The likes of block element styles from theme.json do not have $metadata['name'] set.
if ( ! isset( $metadata['name'] ) && ! empty( $metadata['path'] ) ) {
$block_name = wp_get_block_name_from_theme_json_path( $metadata['path'] );
if ( $block_name ) {
if ( str_starts_with( $block_name, 'core/' ) ) {
$block_name = str_replace( 'core/', '', $block_name );
$block_handle = 'wp-block-' . $block_name;
if ( in_array( $block_handle, $wp_styles->queue, true ) ) {
wp_add_inline_style( $stylesheet_handle, $block_css );
}
} else {
wp_add_inline_style( $stylesheet_handle, $block_css );
}
}
}
}
if ( $update_cache ) {
set_transient( $cache_key, $cached );
}
}
/**
* Gets the block name from a given theme.json path.
*
* @since 6.3.0
* @access private
*
* @param array $path An array of keys describing the path to a property in theme.json.
* @return string Identified block name, or empty string if none found.
*/
function wp_get_block_name_from_theme_json_path( $path ) {
// Block name is expected to be the third item after 'styles' and 'blocks'.
if (
count( $path ) >= 3
&& 'styles' === $path[0]
&& 'blocks' === $path[1]
&& str_contains( $path[2], '/' )
) {
return $path[2];
}
/*
* As fallback and for backward compatibility, allow any core block to be
* at any position.
*/
$result = array_values(
array_filter(
$path,
static function ( $item ) {
if ( str_contains( $item, 'core/' ) ) {
return true;
}
return false;
}
)
);
if ( isset( $result[0] ) ) {
return $result[0];
}
return '';
}
/**
* Checks whether a theme or its parent has a theme.json file.
*
* @since 6.2.0
*
* @return bool Returns true if theme or its parent has a theme.json file, false otherwise.
*/
function wp_theme_has_theme_json() {
static $theme_has_support = array();
$stylesheet = get_stylesheet();
if (
isset( $theme_has_support[ $stylesheet ] ) &&
/*
* Ignore static cache when the development mode is set to 'theme', to avoid interfering with
* the theme developer's workflow.
*/
! wp_is_development_mode( 'theme' )
) {
return $theme_has_support[ $stylesheet ];
}
$stylesheet_directory = get_stylesheet_directory();
$template_directory = get_template_directory();
// This is the same as get_theme_file_path(), which isn't available in load-styles.php context
if ( $stylesheet_directory !== $template_directory && file_exists( $stylesheet_directory . '/theme.json' ) ) {
$path = $stylesheet_directory . '/theme.json';
} else {
$path = $template_directory . '/theme.json';
}
/** This filter is documented in wp-includes/link-template.php */
$path = apply_filters( 'theme_file_path', $path, 'theme.json' );
$theme_has_support[ $stylesheet ] = file_exists( $path );
return $theme_has_support[ $stylesheet ];
}
/**
* Cleans the caches under the theme_json group.
*
* @since 6.2.0
*/
function wp_clean_theme_json_cache() {
wp_cache_delete( 'wp_get_global_stylesheet', 'theme_json' );
wp_cache_delete( 'wp_get_global_styles_svg_filters', 'theme_json' );
wp_cache_delete( 'wp_get_global_settings_custom', 'theme_json' );
wp_cache_delete( 'wp_get_global_settings_theme', 'theme_json' );
wp_cache_delete( 'wp_get_global_styles_custom_css', 'theme_json' );
wp_cache_delete( 'wp_get_theme_data_template_parts', 'theme_json' );
WP_Theme_JSON_Resolver::clean_cached_data();
}
/**
* Returns the current theme's wanted patterns (slugs) to be
* registered from Pattern Directory.
*
* @since 6.3.0
*
* @return string[]
*/
function wp_get_theme_directory_pattern_slugs() {
return WP_Theme_JSON_Resolver::get_theme_data( array(), array( 'with_supports' => false ) )->get_patterns();
}
/**
* Returns the metadata for the custom templates defined by the theme via theme.json.
*
* @since 6.4.0
*
* @return array Associative array of `$template_name => $template_data` pairs,
* with `$template_data` having "title" and "postTypes" fields.
*/
function wp_get_theme_data_custom_templates() {
return WP_Theme_JSON_Resolver::get_theme_data( array(), array( 'with_supports' => false ) )->get_custom_templates();
}
/**
* Returns the metadata for the template parts defined by the theme.
*
* @since 6.4.0
*
* @return array Associative array of `$part_name => $part_data` pairs,
* with `$part_data` having "title" and "area" fields.
*/
function wp_get_theme_data_template_parts() {
$cache_group = 'theme_json';
$cache_key = 'wp_get_theme_data_template_parts';
$can_use_cached = ! wp_is_development_mode( 'theme' );
$metadata = false;
if ( $can_use_cached ) {
$metadata = wp_cache_get( $cache_key, $cache_group );
if ( false !== $metadata ) {
return $metadata;
}
}
if ( false === $metadata ) {
$metadata = WP_Theme_JSON_Resolver::get_theme_data( array(), array( 'with_supports' => false ) )->get_template_parts();
if ( $can_use_cached ) {
wp_cache_set( $cache_key, $metadata, $cache_group );
}
}
return $metadata;
}
/**
* Determines the CSS selector for the block type and property provided,
* returning it if available.
*
* @since 6.3.0
*
* @param WP_Block_Type $block_type The block's type.
* @param string|array $target The desired selector's target, `root` or array path.
* @param boolean $fallback Whether to fall back to broader selector.
*
* @return string|null CSS selector or `null` if no selector available.
*/
function wp_get_block_css_selector( $block_type, $target = 'root', $fallback = false ) {
if ( empty( $target ) ) {
return null;
}
$has_selectors = ! empty( $block_type->selectors );
// Root Selector.
// Calculated before returning as it can be used as fallback for
// feature selectors later on.
$root_selector = null;
if ( $has_selectors && isset( $block_type->selectors['root'] ) ) {
// Use the selectors API if available.
$root_selector = $block_type->selectors['root'];
} elseif ( isset( $block_type->supports['__experimentalSelector'] ) && is_string( $block_type->supports['__experimentalSelector'] ) ) {
// Use the old experimental selector supports property if set.
$root_selector = $block_type->supports['__experimentalSelector'];
} else {
// If no root selector found, generate default block class selector.
$block_name = str_replace( '/', '-', str_replace( 'core/', '', $block_type->name ) );
$root_selector = ".wp-block-{$block_name}";
}
// Return selector if it's the root target we are looking for.
if ( 'root' === $target ) {
return $root_selector;
}
// If target is not `root` we have a feature or subfeature as the target.
// If the target is a string convert to an array.
if ( is_string( $target ) ) {
$target = explode( '.', $target );
}
// Feature Selectors ( May fallback to root selector ).
if ( 1 === count( $target ) ) {
$fallback_selector = $fallback ? $root_selector : null;
// Prefer the selectors API if available.
if ( $has_selectors ) {
// Look for selector under `feature.root`.
$path = array( current( $target ), 'root' );
$feature_selector = _wp_array_get( $block_type->selectors, $path, null );
if ( $feature_selector ) {
return $feature_selector;
}
// Check if feature selector is set via shorthand.
$feature_selector = _wp_array_get( $block_type->selectors, $target, null );
return is_string( $feature_selector ) ? $feature_selector : $fallback_selector;
}
// Try getting old experimental supports selector value.
$path = array( current( $target ), '__experimentalSelector' );
$feature_selector = _wp_array_get( $block_type->supports, $path, null );
// Nothing to work with, provide fallback or null.
if ( null === $feature_selector ) {
return $fallback_selector;
}
// Scope the feature selector by the block's root selector.
return WP_Theme_JSON::scope_selector( $root_selector, $feature_selector );
}
// Subfeature selector
// This may fallback either to parent feature or root selector.
$subfeature_selector = null;
// Use selectors API if available.
if ( $has_selectors ) {
$subfeature_selector = _wp_array_get( $block_type->selectors, $target, null );
}
// Only return if we have a subfeature selector.
if ( $subfeature_selector ) {
return $subfeature_selector;
}
// To this point we don't have a subfeature selector. If a fallback
// has been requested, remove subfeature from target path and return
// results of a call for the parent feature's selector.
if ( $fallback ) {
return wp_get_block_css_selector( $block_type, $target[0], $fallback );
}
return null;
}