WP_Font_Face::validate_font_face_declarations( array $font_face ): array|false

Source

private function validate_font_face_declarations( array $font_face ) {
	$font_face = wp_parse_args( $font_face, $this->font_face_property_defaults );

	// Check the font-family.
	if ( empty( $font_face['font-family'] ) || ! is_string( $font_face['font-family'] ) ) {
		// @todo replace with `wp_trigger_error()`.
		_doing_it_wrong(
			__METHOD__,
			__( 'Font font-family must be a non-empty string.' ),
			'6.4.0'
		);
		return false;
	}

	// Make sure that local fonts have 'src' defined.
	if ( empty( $font_face['src'] ) || ( ! is_string( $font_face['src'] ) && ! is_array( $font_face['src'] ) ) ) {
		// @todo replace with `wp_trigger_error()`.
		_doing_it_wrong(
			__METHOD__,
			__( 'Font src must be a non-empty string or an array of strings.' ),
			'6.4.0'
		);
		return false;
	}

	// Validate the 'src' property.
	foreach ( (array) $font_face['src'] as $src ) {
		if ( empty( $src ) || ! is_string( $src ) ) {
			// @todo replace with `wp_trigger_error()`.
			_doing_it_wrong(
				__METHOD__,
				__( 'Each font src must be a non-empty string.' ),
				'6.4.0'
			);
			return false;
		}
	}

	// Check the font-weight.
	if ( ! is_string( $font_face['font-weight'] ) && ! is_int( $font_face['font-weight'] ) ) {
		// @todo replace with `wp_trigger_error()`.
		_doing_it_wrong(
			__METHOD__,
			__( 'Font font-weight must be a properly formatted string or integer.' ),
			'6.4.0'
		);
		return false;
	}

	// Check the font-display.
	if ( ! in_array( $font_face['font-display'], $this->valid_font_display, true ) ) {
		$font_face['font-display'] = $this->font_face_property_defaults['font-display'];
	}

	// Remove invalid properties.
	foreach ( $font_face as $property => $value ) {
		if ( ! in_array( $property, $this->valid_font_face_properties, true ) ) {
			unset( $font_face[ $property ] );
		}
	}

	return $font_face;
}

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