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Filter out unused webfonts from the front-end #39036

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Filter out unused webfonts from the front-end #39036

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68 changes: 68 additions & 0 deletions lib/compat/wordpress-6.0/class-wp-webfonts.php
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,16 @@ class WP_Webfonts {
*/
private static $webfonts = array();

/**
* An array of used webfonts.
*
* @static
* @access private
* @var array
*/
private static $block_used_fonts = array();
private static $globally_used_fonts = array();

/**
* An array of registered providers.
*
Expand Down Expand Up @@ -51,12 +61,68 @@ public function init() {
$this->stylesheet_handle = 'webfonts';
$hook = 'wp_enqueue_scripts';
}

add_filter( 'pre_render_block', array( $this, 'register_used_font_family_from_block' ), 10, 2 );
add_action( 'init', array( $this, 'register_used_font_families_on_global_styles' ) );

add_action( $hook, array( $this, 'generate_and_enqueue_styles' ) );

// Enqueue webfonts in the block editor.
add_action( 'admin_init', array( $this, 'generate_and_enqueue_editor_styles' ) );
}

private function register_used_font_family( $setting ) {
if ( isset( $setting['typography'] ) && isset( $setting['typography']['fontFamily'] ) ) {
$font_family_custom = $setting['typography']['fontFamily'];

if ( strpos( $font_family_custom, 'var:preset|font-family|' ) !== false ) {
$index_to_splice = strrpos( $font_family_custom, '|' ) + 1;
$font_family_slug = _wp_to_kebab_case( substr( $font_family_custom, $index_to_splice ) );

self::$globally_used_fonts[ $font_family_slug ] = 1;
}
}
}

public function register_used_font_families_on_global_styles() {
$global_styles = gutenberg_get_global_styles();

// Register used fonts from blocks.
foreach ( $global_styles['blocks'] as $id => $setting ) {
$this->register_used_font_family( $setting );
}

// Register used fonts from elements.
foreach ( $global_styles['elements'] as $id => $setting ) {
$this->register_used_font_family( $setting );
}

// Register used fonts from global styles.
$this->register_used_font_family( $global_styles );
}

public function register_used_font_family_from_block( $output, $block ) {
if ( isset( $block['attrs']['fontFamily'] ) ) {
self::$block_used_fonts[ $block['attrs']['fontFamily'] ] = 1;
}
}

private function filter_unused_fonts() {
$registered_webfonts = $this->get_fonts();

foreach ( $registered_webfonts as $id => $webfont ) {
$font_name = _wp_to_kebab_case( $webfont['font-family'] );

if ( isset( self::$block_used_fonts[ $font_name ] ) || isset( self::$globally_used_fonts[ $font_name ] ) ) {
continue;
}

unset( $registered_webfonts[ $id ] );
}

self::$webfonts = $registered_webfonts;
}

/**
* Get the list of fonts.
*
Expand Down Expand Up @@ -202,6 +268,8 @@ public function register_provider( $provider, $class ) {
* Generate and enqueue webfonts styles.
*/
public function generate_and_enqueue_styles() {
$this->filter_unused_fonts();

// Generate the styles.
$styles = $this->generate_styles();

Expand Down