File "class-wp-font-face-resolver.php"

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<?php
/**
 * WP_Font_Face_Resolver class.
 *
 * @package    WordPress
 * @subpackage Fonts
 * @since      6.4.0
 *
 * @core-merge: this file is located in `wp-includes/fonts/`.
 */

if ( ! class_exists( 'WP_Font_Face_Resolver' ) ) {

	/**
	 * The Font Face Resolver abstracts the processing of different data sources
	 * (such as theme.json) for processing within the Font Face.
	 *
	 * This class is for internal core usage and is not supposed to be used by
	 * extenders (plugins and/or themes).
	 *
	 * @access private
	 */
	class WP_Font_Face_Resolver {

		/**
		 * Gets fonts defined in theme.json.
		 *
		 * @since 6.4.0
		 *
		 * @return array Returns the font-families, each with their font-face variations.
		 */
		public static function get_fonts_from_theme_json() {
			$settings = gutenberg_get_global_settings();

			// Bail out early if there are no font settings.
			if ( empty( $settings['typography']['fontFamilies'] ) ) {
				return array();
			}

			return static::parse_settings( $settings );
		}

		/**
		 * Parse theme.json settings to extract font definitions with variations grouped by font-family.
		 *
		 * @since 6.4.0
		 *
		 * @param array $settings Font settings to parse.
		 * @return array Returns an array of fonts, grouped by font-family.
		 */
		private static function parse_settings( array $settings ) {
			$fonts = array();

			foreach ( $settings['typography']['fontFamilies'] as $font_families ) {
				foreach ( $font_families as $definition ) {

					// Skip if "fontFace" is not defined, meaning there are no variations.
					if ( empty( $definition['fontFace'] ) ) {
						continue;
					}

					// Skip if "fontFamily" is not defined.
					if ( empty( $definition['fontFamily'] ) ) {
						continue;
					}

					$font_family_name = static::maybe_parse_name_from_comma_separated_list( $definition['fontFamily'] );

					// Skip if no font family is defined.
					if ( empty( $font_family_name ) ) {
						continue;
					}

					// Prepare the fonts array structure for this font-family.
					if ( ! array_key_exists( $font_family_name, $fonts ) ) {
						$fonts[ $font_family_name ] = array();
					}

					$fonts[ $font_family_name ] = static::convert_font_face_properties( $definition['fontFace'], $font_family_name );
				}
			}

			return $fonts;
		}

		/**
		 * Parse font-family name from comma-separated lists.
		 *
		 * If the given `fontFamily` is a comma-separated lists (example: "Inter, sans-serif" ),
		 * parse and return the fist font from the list.
		 *
		 * @since 6.4.0
		 *
		 * @param string $font_family Font family `fontFamily' to parse.
		 * @return string Font-family name.
		 */
		private static function maybe_parse_name_from_comma_separated_list( $font_family ) {
			if ( str_contains( $font_family, ',' ) ) {
				$font_family = explode( ',', $font_family )[0];
			}

			return trim( $font_family, "\"'" );
		}

		/**
		 * Converts font-face properties from theme.json format.
		 *
		 * @since 6.4.0
		 *
		 * @param array  $font_face_definition The font-face definitions to convert.
		 * @param string $font_family_property The value to store in the font-face font-family property.
		 * @return array Converted font-face properties.
		 */
		private static function convert_font_face_properties( array $font_face_definition, $font_family_property ) {
			$converted_font_faces = array();

			foreach ( $font_face_definition as $font_face ) {
				// Add the font-family property to the font-face.
				$font_face['font-family'] = $font_family_property;

				// Converts the "file:./" src placeholder into a theme font file URI.
				if ( ! empty( $font_face['src'] ) ) {
					$font_face['src'] = static::to_theme_file_uri( (array) $font_face['src'] );
				}

				// Convert camelCase properties into kebab-case.
				$font_face = static::to_kebab_case( $font_face );

				$converted_font_faces[] = $font_face;
			}

			return $converted_font_faces;
		}

		/**
		 * Converts each 'file:./' placeholder into a URI to the font file in the theme.
		 *
		 * The 'file:./' is specified in the theme's `theme.json` as a placeholder to be
		 * replaced with the URI to the font file's location in the theme. When a "src"
		 * beings with this placeholder, it is replaced, converting the src into a URI.
		 *
		 * @since 6.4.0
		 *
		 * @param array $src An array of font file sources to process.
		 * @return array An array of font file src URI(s).
		 */
		private static function to_theme_file_uri( array $src ) {
			$placeholder = 'file:./';

			foreach ( $src as $src_key => $src_url ) {
				// Skip if the src doesn't start with the placeholder, as there's nothing to replace.
				if ( ! str_starts_with( $src_url, $placeholder ) ) {
					continue;
				}

				$src_file        = str_replace( $placeholder, '', $src_url );
				$src[ $src_key ] = get_theme_file_uri( $src_file );
			}

			return $src;
		}

		/**
		 * Converts all first dimension keys into kebab-case.
		 *
		 * @since 6.4.0
		 *
		 * @param array $data The array to process.
		 * @return array Data with first dimension keys converted into kebab-case.
		 */
		private static function to_kebab_case( array $data ) {
			foreach ( $data as $key => $value ) {
				$kebab_case          = _wp_to_kebab_case( $key );
				$data[ $kebab_case ] = $value;
				if ( $kebab_case !== $key ) {
					unset( $data[ $key ] );
				}
			}

			return $data;
		}
	}
}