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<?php

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/**

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* WP_Font_Face_Resolver class.

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* @package WordPress

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* @subpackage Fonts

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* @since 6.4.0

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/**

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* The Font Face Resolver abstracts the processing of different data sources

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* (such as theme.json) for processing within the Font Face.

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* This class is for internal core usage and is not supposed to be used by

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* extenders (plugins and/or themes).

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* @access private

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class WP_Font_Face_Resolver {

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/**

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* Gets fonts defined in theme.json.

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* @since 6.4.0

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* @return array Returns the font-families, each with their font-face variations.

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public static function get_fonts_from_theme_json() {

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$settings = wp_get_global_settings();

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// Bail out early if there are no font settings.

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if ( empty( $settings['typography']['fontFamilies'] ) ) {

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return array();

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}

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return static::parse_settings( $settings );

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}

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/**

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* Parse theme.json settings to extract font definitions with variations grouped by font-family.

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* @since 6.4.0

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* @param array $settings Font settings to parse.

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* @return array Returns an array of fonts, grouped by font-family.

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private static function parse_settings( array $settings ) {

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$fonts = array();

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

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foreach ( $font_families as $definition ) {

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// Skip if "fontFace" is not defined, meaning there are no variations.

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if ( empty( $definition['fontFace'] ) ) {

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continue;

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}

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// Skip if "fontFamily" is not defined.

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if ( empty( $definition['fontFamily'] ) ) {

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continue;

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}

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

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// Skip if no font family is defined.

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if ( empty( $font_family_name ) ) {

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continue;

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}

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

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}

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}

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return $fonts;

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}

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/**

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* Parse font-family name from comma-separated lists.

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* If the given `fontFamily` is a comma-separated lists (example: "Inter, sans-serif" ),

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* parse and return the fist font from the list.

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* @since 6.4.0

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* @param string $font_family Font family `fontFamily' to parse.

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* @return string Font-family name.

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private static function maybe_parse_name_from_comma_separated_list( $font_family ) {

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if ( str_contains( $font_family, ',' ) ) {

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$font_family = explode( ',', $font_family )[0];

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}

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

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}

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/**

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* Converts font-face properties from theme.json format.

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* @since 6.4.0

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* @param array $font_face_definition The font-face definitions to convert.

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* @param string $font_family_property The value to store in the font-face font-family property.

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* @return array Converted font-face properties.

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private static function convert_font_face_properties( array $font_face_definition, $font_family_property ) {

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$converted_font_faces = array();

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foreach ( $font_face_definition as $font_face ) {

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// Add the font-family property to the font-face.

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$font_face['font-family'] = $font_family_property;

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// Converts the "file:./" src placeholder into a theme font file URI.

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if ( ! empty( $font_face['src'] ) ) {

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$font_face['src'] = static::to_theme_file_uri( (array) $font_face['src'] );

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}

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// Convert camelCase properties into kebab-case.

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$font_face = static::to_kebab_case( $font_face );

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$converted_font_faces[] = $font_face;

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}

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return $converted_font_faces;

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}

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/**

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* Converts each 'file:./' placeholder into a URI to the font file in the theme.

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* The 'file:./' is specified in the theme's `theme.json` as a placeholder to be

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* replaced with the URI to the font file's location in the theme. When a "src"

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* beings with this placeholder, it is replaced, converting the src into a URI.

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* @since 6.4.0

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* @param array $src An array of font file sources to process.

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* @return array An array of font file src URI(s).

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private static function to_theme_file_uri( array $src ) {

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$placeholder = 'file:./';

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foreach ( $src as $src_key => $src_url ) {

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// Skip if the src doesn't start with the placeholder, as there's nothing to replace.

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if ( ! str_starts_with( $src_url, $placeholder ) ) {

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continue;

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}

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$src_file = str_replace( $placeholder, '', $src_url );

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$src[ $src_key ] = get_theme_file_uri( $src_file );

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}

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return $src;

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}

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/**

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* Converts all first dimension keys into kebab-case.

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* @since 6.4.0

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* @param array $data The array to process.

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* @return array Data with first dimension keys converted into kebab-case.

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private static function to_kebab_case( array $data ) {

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foreach ( $data as $key => $value ) {

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$kebab_case = _wp_to_kebab_case( $key );

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$data[ $kebab_case ] = $value;

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if ( $kebab_case !== $key ) {

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unset( $data[ $key ] );

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}

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}

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return $data;

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}

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}

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