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/**
 * WP_Font_Face_Resolver class.
 *
 * @package    WordPress
 * @subpackage Fonts
 * @since      6.4.0
 */

/**
 * 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 = wp_get_global_settings();

		// Bail out early if there are no font settings.
		if ( empty( $settings[&#039;typography&#039;][&#039;fontFamilies&#039;] ) ) {
			return array();
		}

		return static::parse_settings( $settings );
	}

	/**
	 * Gets fonts defined in style variations.
	 *
	 * @since 6.7.0
	 *
	 * @return array Returns an array of font-families.
	 */
	public static function get_fonts_from_style_variations() {
		$variations = WP_Theme_JSON_Resolver::get_style_variations();
		$fonts      = array();

		if ( empty( $variations ) ) {
			return $fonts;
		}

		foreach ( $variations as $variation ) {
			if ( ! empty( $variation[&#039;settings&#039;][&#039;typography&#039;][&#039;fontFamilies&#039;][&#039;theme&#039;] ) ) {
				$fonts = array_merge( $fonts, $variation[&#039;settings&#039;][&#039;typography&#039;][&#039;fontFamilies&#039;][&#039;theme&#039;] );
			}
		}

		$settings = array(
			&#039;typography&#039; =&gt; array(
				&#039;fontFamilies&#039; =&gt; array(
					&#039;theme&#039; =&gt; $fonts,
				),
			),
		);

		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[&#039;typography&#039;][&#039;fontFamilies&#039;] as $font_families ) {
			foreach ( $font_families as $definition ) {

				// Skip if &quot;fontFace&quot; is not defined, meaning there are no variations.
				if ( empty( $definition[&#039;fontFace&#039;] ) ) {
					continue;
				}

				// Skip if &quot;fontFamily&quot; is not defined.
				if ( empty( $definition[&#039;fontFamily&#039;] ) ) {
					continue;
				}

				$font_family_name = static::maybe_parse_name_from_comma_separated_list( $definition[&#039;fontFamily&#039;] );

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

				$fonts[] = static::convert_font_face_properties( $definition[&#039;fontFace&#039;], $font_family_name );
			}
		}

		return $fonts;
	}

	/**
	 * Parse font-family name from comma-separated lists.
	 *
	 * If the given `fontFamily` is a comma-separated lists (example: &quot;Inter, sans-serif&quot; ),
	 * parse and return the fist font from the list.
	 *
	 * @since 6.4.0
	 *
	 * @param string $font_family Font family `fontFamily&#039; to parse.
	 * @return string Font-family name.
	 */
	private static function maybe_parse_name_from_comma_separated_list( $font_family ) {
		if ( str_contains( $font_family, &#039;,&#039; ) ) {
			$font_family = explode( &#039;,&#039;, $font_family )[0];
		}

		return trim( $font_family, &quot;\&quot;&#039;&quot; );
	}

	/**
	 * 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[&#039;font-family&#039;] = $font_family_property;

			// Converts the &quot;file:./&quot; src placeholder into a theme font file URI.
			if ( ! empty( $font_face[&#039;src&#039;] ) ) {
				$font_face[&#039;src&#039;] = static::to_theme_file_uri( (array) $font_face[&#039;src&#039;] );
			}

			// 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 &#039;file:./&#039; placeholder into a URI to the font file in the theme.
	 *
	 * The &#039;file:./&#039; is specified in the theme&#039;s `theme.json` as a placeholder to be
	 * replaced with the URI to the font file&#039;s location in the theme. When a &quot;src&quot;
	 * 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 = &#039;file:./&#039;;

		foreach ( $src as $src_key =&gt; $src_url ) {
			// Skip if the src doesn&#039;t start with the placeholder, as there&#039;s nothing to replace.
			if ( ! str_starts_with( $src_url, $placeholder ) ) {
				continue;
			}

			$src_file        = str_replace( $placeholder, &#039;&#039;, $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 =&gt; $value ) {
			$kebab_case          = _wp_to_kebab_case( $key );
			$data[ $kebab_case ] = $value;
			if ( $kebab_case !== $key ) {
				unset( $data[ $key ] );
			}
		}

		return $data;
	}
}
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