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<?php
/**
* WP_Theme_JSON_Resolver class
*
* @package WordPress
* @subpackage Theme
* @since 5.8.0
*/
/**
* Class that abstracts the processing of the different data sources
* for site-level config and offers an API to work with them.
*
* @access private
*/
class WP_Theme_JSON_Resolver {
/**
* Container for data coming from core.
*
* @since 5.8.0
* @var WP_Theme_JSON
*/
private static $core = null;
/**
* Container for data coming from the theme.
*
* @since 5.8.0
* @var WP_Theme_JSON
*/
private static $theme = null;
/**
* Whether or not the theme supports theme.json.
*
* @since 5.8.0
* @var bool
*/
private static $theme_has_support = null;
/**
* Structure to hold i18n metadata.
*
* @since 5.8.0
* @var array
*/
private static $theme_json_i18n = null;
/**
* Processes a file that adheres to the theme.json schema
* and returns an array with its contents, or a void array if none found.
*
* @since 5.8.0
*
* @param string $file_path Path to file. Empty if no file.
* @return array Contents that adhere to the theme.json schema.
*/
private static function read_json_file( $file_path ) {
$config = array();
if ( $file_path ) {
$decoded_file = json_decode(
file_get_contents( $file_path ),
true
);
$json_decoding_error = json_last_error();
if ( JSON_ERROR_NONE !== $json_decoding_error ) {
trigger_error( "Error when decoding a theme.json schema at path $file_path " . json_last_error_msg() );
return $config;
}
if ( is_array( $decoded_file ) ) {
$config = $decoded_file;
}
}
return $config;
}
/**
* Converts a tree as in i18n-theme.json into a linear array
* containing metadata to translate a theme.json file.
*
* For example, given this input:
*
* {
* "settings": {
* "*": {
* "typography": {
* "fontSizes": [ { "name": "Font size name" } ],
* "fontStyles": [ { "name": "Font size name" } ]
* }
* }
* }
* }
*
* will return this output:
*
* [
* 0 => [
* 'path' => [ 'settings', '*', 'typography', 'fontSizes' ],
* 'key' => 'name',
* 'context' => 'Font size name'
* ],
* 1 => [
* 'path' => [ 'settings', '*', 'typography', 'fontStyles' ],
* 'key' => 'name',
* 'context' => 'Font style name'
* ]
* ]
*
* @since 5.8.0
*
* @param array $i18n_partial A tree that follows the format of i18n-theme.json.
* @param array $current_path Optional. Keeps track of the path as we walk down the given tree.
* Default empty array.
* @return array A linear array containing the paths to translate.
*/
private static function extract_paths_to_translate( $i18n_partial, $current_path = array() ) {
$result = array();
foreach ( $i18n_partial as $property => $partial_child ) {
if ( is_numeric( $property ) ) {
foreach ( $partial_child as $key => $context ) {
$result[] = array(
'path' => $current_path,
'key' => $key,
'context' => $context,
);
}
return $result;
}
$result = array_merge(
$result,
self::extract_paths_to_translate( $partial_child, array_merge( $current_path, array( $property ) ) )
);
}
return $result;
}
/**
* Returns a data structure used in theme.json translation.
*
* @since 5.8.0
*
* @return array An array of theme.json fields that are translatable and the keys that are translatable.
*/
public static function get_fields_to_translate() {
if ( null === self::$theme_json_i18n ) {
$file_structure = self::read_json_file( __DIR__ . '/theme-i18n.json' );
self::$theme_json_i18n = self::extract_paths_to_translate( $file_structure );
}
return self::$theme_json_i18n;
}
/**
* Translates a chunk of the loaded theme.json structure.
*
* @since 5.8.0
*
* @param array $array_to_translate The chunk of theme.json to translate.
* @param string $key The key of the field that contains the string to translate.
* @param string $context The context to apply in the translation call.
* @param string $domain Text domain. Unique identifier for retrieving translated strings.
* @return array Returns the modified $theme_json chunk.
*/
private static function translate_theme_json_chunk( array $array_to_translate, $key, $context, $domain ) {
foreach ( $array_to_translate as $item_key => $item_to_translate ) {
if ( empty( $item_to_translate[ $key ] ) ) {
continue;
}
// phpcs:ignore WordPress.WP.I18n.LowLevelTranslationFunction,WordPress.WP.I18n.NonSingularStringLiteralText,WordPress.WP.I18n.NonSingularStringLiteralContext,WordPress.WP.I18n.NonSingularStringLiteralDomain
$array_to_translate[ $item_key ][ $key ] = translate_with_gettext_context( $array_to_translate[ $item_key ][ $key ], $context, $domain );
}
return $array_to_translate;
}
/**
* Given a theme.json structure modifies it in place to update certain values
* by its translated strings according to the language set by the user.
*
* @since 5.8.0
*
* @param array $theme_json The theme.json to translate.
* @param string $domain Optional. Text domain. Unique identifier for retrieving translated strings.
* Default 'default'.
* @return array Returns the modified $theme_json_structure.
*/
private static function translate( $theme_json, $domain = 'default' ) {
$fields = self::get_fields_to_translate();
foreach ( $fields as $field ) {
$path = $field['path'];
$key = $field['key'];
$context = $field['context'];
/*
* We need to process the paths that include '*' separately.
* One example of such a path would be:
* [ 'settings', 'blocks', '*', 'color', 'palette' ]
*/
$nodes_to_iterate = array_keys( $path, '*', true );
if ( ! empty( $nodes_to_iterate ) ) {
/*
* At the moment, we only need to support one '*' in the path, so take it directly.
* - base will be [ 'settings', 'blocks' ]
* - data will be [ 'color', 'palette' ]
*/
$base_path = array_slice( $path, 0, $nodes_to_iterate[0] );
$data_path = array_slice( $path, $nodes_to_iterate[0] + 1 );
$base_tree = _wp_array_get( $theme_json, $base_path, array() );
foreach ( $base_tree as $node_name => $node_data ) {
$array_to_translate = _wp_array_get( $node_data, $data_path, null );
if ( is_null( $array_to_translate ) ) {
continue;
}
// Whole path will be [ 'settings', 'blocks', 'core/paragraph', 'color', 'palette' ].
$whole_path = array_merge( $base_path, array( $node_name ), $data_path );
$translated_array = self::translate_theme_json_chunk( $array_to_translate, $key, $context, $domain );
_wp_array_set( $theme_json, $whole_path, $translated_array );
}
} else {
$array_to_translate = _wp_array_get( $theme_json, $path, null );
if ( is_null( $array_to_translate ) ) {
continue;
}
$translated_array = self::translate_theme_json_chunk( $array_to_translate, $key, $context, $domain );
_wp_array_set( $theme_json, $path, $translated_array );
}
}
return $theme_json;
}
/**
* Return core's origin config.
*
* @since 5.8.0
*
* @return WP_Theme_JSON Entity that holds core data.
*/
public static function get_core_data() {
if ( null !== self::$core ) {
return self::$core;
}
$config = self::read_json_file( __DIR__ . '/theme.json' );
$config = self::translate( $config );
self::$core = new WP_Theme_JSON( $config, 'core' );
return self::$core;
}
/**
* Returns the theme's data.
*
* Data from theme.json can be augmented via the $theme_support_data variable.
* This is useful, for example, to backfill the gaps in theme.json that a theme
* has declared via add_theme_supports.
*
* Note that if the same data is present in theme.json and in $theme_support_data,
* the theme.json's is not overwritten.
*
* @since 5.8.0
*
* @param array $theme_support_data Optional. Theme support data in theme.json format.
* Default empty array.
* @return WP_Theme_JSON Entity that holds theme data.
*/
public static function get_theme_data( $theme_support_data = array() ) {
if ( null === self::$theme ) {
$theme_json_data = self::read_json_file( self::get_file_path_from_theme( 'theme.json' ) );
$theme_json_data = self::translate( $theme_json_data, wp_get_theme()->get( 'TextDomain' ) );
self::$theme = new WP_Theme_JSON( $theme_json_data );
}
if ( empty( $theme_support_data ) ) {
return self::$theme;
}
/*
* We want the presets and settings declared in theme.json
* to override the ones declared via add_theme_support.
*/
$with_theme_supports = new WP_Theme_JSON( $theme_support_data );
$with_theme_supports->merge( self::$theme );
return $with_theme_supports;
}
/**
* There are different sources of data for a site: core and theme.
*
* While the getters {@link get_core_data}, {@link get_theme_data} return the raw data
* from the respective origins, this method merges them all together.
*
* If the same piece of data is declared in different origins (core and theme),
* the last origin overrides the previous. For example, if core disables custom colors
* but a theme enables them, the theme config wins.
*
* @since 5.8.0
*
* @param array $settings Optional. Existing block editor settings. Default empty array.
* @return WP_Theme_JSON
*/
public static function get_merged_data( $settings = array() ) {
$theme_support_data = WP_Theme_JSON::get_from_editor_settings( $settings );
$result = new WP_Theme_JSON();
$result->merge( self::get_core_data() );
$result->merge( self::get_theme_data( $theme_support_data ) );
return $result;
}
/**
* Whether the current theme has a theme.json file.
*
* @since 5.8.0
*
* @return bool
*/
public static function theme_has_support() {
if ( ! isset( self::$theme_has_support ) ) {
self::$theme_has_support = (bool) self::get_file_path_from_theme( 'theme.json' );
}
return self::$theme_has_support;
}
/**
* Builds the path to the given file and checks that it is readable.
*
* If it isn't, returns an empty string, otherwise returns the whole file path.
*
* @since 5.8.0
*
* @param string $file_name Name of the file.
* @return string The whole file path or empty if the file doesn't exist.
*/
private static function get_file_path_from_theme( $file_name ) {
/*
* This used to be a locate_template call. However, that method proved problematic
* due to its use of constants (STYLESHEETPATH) that threw errors in some scenarios.
*
* When the theme.json merge algorithm properly supports child themes,
* this should also fall back to the template path, as locate_template did.
*/
$located = '';
$candidate = get_stylesheet_directory() . '/' . $file_name;
if ( is_readable( $candidate ) ) {
$located = $candidate;
}
return $located;
}
/**
* Cleans the cached data so it can be recalculated.
*
* @since 5.8.0
*/
public static function clean_cached_data() {
self::$core = null;
self::$theme = null;
self::$theme_has_support = null;
self::$theme_json_i18n = null;
}
}