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<?php
/**
* Icons API: WP_Icons_Registry class
*
* @package WordPress
* @since 7.0.0
*/
/**
* Core class used for interacting with registered icons.
*
* @since 7.0.0
*/
class WP_Icons_Registry {
/**
* Registered icons array.
*
* @var array[]
*/
protected $registered_icons = array();
/**
* Container for the main instance of the class.
*
* @var WP_Icons_Registry|null
*/
protected static $instance = null;
/**
* Constructor.
*
* WP_Icons_Registry is a singleton class, so keep this protected.
*
* For 7.0, the Icons Registry is closed for third-party icon registry,
* serving only a subset of core icons.
*
* These icons are defined in @wordpress/packages (Gutenberg repository) as
* SVG files and as entries in a single manifest file. On init, the
* registry is loaded with those icons listed in the manifest.
*/
protected function __construct() {
$icons_directory = __DIR__ . '/images/icon-library/';
$manifest_path = __DIR__ . '/assets/icon-library-manifest.php';
if ( ! is_readable( $manifest_path ) ) {
wp_trigger_error(
__METHOD__,
__( 'Core icon collection manifest is missing or unreadable.' )
);
return;
}
$collection = include $manifest_path;
if ( empty( $collection ) ) {
wp_trigger_error(
__METHOD__,
__( 'Core icon collection manifest is empty or invalid.' )
);
return;
}
foreach ( $collection as $icon_name => $icon_data ) {
if (
empty( $icon_data['filePath'] )
|| ! is_string( $icon_data['filePath'] )
) {
_doing_it_wrong(
__METHOD__,
__( 'Core icon collection manifest must provide valid a "filePath" for each icon.' ),
'7.0.0'
);
return;
}
$this->register(
'core/' . $icon_name,
array(
'label' => $icon_data['label'],
'filePath' => $icons_directory . $icon_data['filePath'],
)
);
}
}
/**
* Registers an icon.
*
* @param string $icon_name Icon name including namespace.
* @param array $icon_properties {
* List of properties for the icon.
*
* @type string $label Required. A human-readable label for the icon.
* @type string $content Optional. SVG markup for the icon.
* If not provided, the content will be retrieved from the `filePath` if set.
* If both `content` and `filePath` are not set, the icon will not be registered.
* @type string $filePath Optional. The full path to the file containing the icon content.
* }
* @return bool True if the icon was registered with success and false otherwise.
*/
protected function register( $icon_name, $icon_properties ) {
if ( ! isset( $icon_name ) || ! is_string( $icon_name ) ) {
_doing_it_wrong(
__METHOD__,
__( 'Icon name must be a string.' ),
'7.0.0'
);
return false;
}
$allowed_keys = array_fill_keys( array( 'label', 'content', 'filePath' ), 1 );
foreach ( array_keys( $icon_properties ) as $key ) {
if ( ! array_key_exists( $key, $allowed_keys ) ) {
_doing_it_wrong(
__METHOD__,
sprintf(
// translators: %s is the name of any user-provided key
__( 'Invalid icon property: "%s".' ),
$key
),
'7.0.0'
);
return false;
}
}
if ( ! isset( $icon_properties['label'] ) || ! is_string( $icon_properties['label'] ) ) {
_doing_it_wrong(
__METHOD__,
__( 'Icon label must be a string.' ),
'7.0.0'
);
return false;
}
if (
( ! isset( $icon_properties['content'] ) && ! isset( $icon_properties['filePath'] ) ) ||
( isset( $icon_properties['content'] ) && isset( $icon_properties['filePath'] ) )
) {
_doing_it_wrong(
__METHOD__,
__( 'Icons must provide either `content` or `filePath`.' ),
'7.0.0'
);
return false;
}
if ( isset( $icon_properties['content'] ) ) {
if ( ! is_string( $icon_properties['content'] ) ) {
_doing_it_wrong(
__METHOD__,
__( 'Icon content must be a string.' ),
'7.0.0'
);
return false;
}
$sanitized_icon_content = $this->sanitize_icon_content( $icon_properties['content'] );
if ( empty( $sanitized_icon_content ) ) {
_doing_it_wrong(
__METHOD__,
__( 'Icon content does not contain valid SVG markup.' ),
'7.0.0'
);
return false;
}
}
$icon = array_merge(
$icon_properties,
array( 'name' => $icon_name )
);
$this->registered_icons[ $icon_name ] = $icon;
return true;
}
/**
* Sanitizes the icon SVG content.
*
* Logic borrowed from twentytwenty.
* @see twentytwenty_get_theme_svg
*
* @param string $icon_content The icon SVG content to sanitize.
* @return string The sanitized icon SVG content.
*/
protected function sanitize_icon_content( $icon_content ) {
$allowed_tags = array(
'svg' => array(
'class' => true,
'xmlns' => true,
'width' => true,
'height' => true,
'viewbox' => true,
'aria-hidden' => true,
'role' => true,
'focusable' => true,
),
'path' => array(
'fill' => true,
'fill-rule' => true,
'd' => true,
'transform' => true,
),
'polygon' => array(
'fill' => true,
'fill-rule' => true,
'points' => true,
'transform' => true,
'focusable' => true,
),
);
return wp_kses( $icon_content, $allowed_tags );
}
/**
* Retrieves the content of a registered icon.
*
* @param string $icon_name Icon name including namespace.
* @return string|null The content of the icon, if found.
*/
protected function get_content( $icon_name ) {
if ( ! isset( $this->registered_icons[ $icon_name ]['content'] ) ) {
$content = file_get_contents(
$this->registered_icons[ $icon_name ]['filePath']
);
$content = $this->sanitize_icon_content( $content );
if ( empty( $content ) ) {
wp_trigger_error(
__METHOD__,
__( 'Icon content does not contain valid SVG markup.' )
);
return null;
}
$this->registered_icons[ $icon_name ]['content'] = $content;
}
return $this->registered_icons[ $icon_name ]['content'];
}
/**
* Retrieves an array containing the properties of a registered icon.
*
*
* @param string $icon_name Icon name including namespace.
* @return array|null Registered icon properties or `null` if the icon is not registered.
*/
public function get_registered_icon( $icon_name ) {
if ( ! $this->is_registered( $icon_name ) ) {
return null;
}
$icon = $this->registered_icons[ $icon_name ];
$icon['content'] = $icon['content'] ?? $this->get_content( $icon_name );
return $icon;
}
/**
* Retrieves all registered icons.
*
* @param string $search Optional. Search term by which to filter the icons.
* @return array[] Array of arrays containing the registered icon properties.
*/
public function get_registered_icons( $search = '' ) {
$icons = array();
foreach ( $this->registered_icons as $icon ) {
if ( ! empty( $search ) && false === stripos( $icon['name'], $search ) ) {
continue;
}
$icon['content'] = $icon['content'] ?? $this->get_content( $icon['name'] );
$icons[] = $icon;
}
return $icons;
}
/**
* Checks if an icon is registered.
*
*
* @param string $icon_name Icon name including namespace.
* @return bool True if the icon is registered, false otherwise.
*/
public function is_registered( $icon_name ) {
return isset( $this->registered_icons[ $icon_name ] );
}
/**
* Utility method to retrieve the main instance of the class.
*
* The instance will be created if it does not exist yet.
*
*
* @return WP_Icons_Registry The main instance.
*/
public static function get_instance() {
if ( null === self::$instance ) {
self::$instance = new self();
}
return self::$instance;
}
}