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<?php
/**
* 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['typography']['fontFamilies'] ) ) {
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['settings']['typography']['fontFamilies']['theme'] ) ) {
$fonts = array_merge( $fonts, $variation['settings']['typography']['fontFamilies']['theme'] );
}
}
$settings = array(
'typography' => array(
'fontFamilies' => array(
'theme' => $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['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;
}
$fonts[] = 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;
}
}