Adds surrounding quotes to font family names that contain special characters.

Description

It follows the recommendations from the CSS Fonts Module Level 4.

Parameters

$itemstringrequired

A font family name.

Return

Source

private static function maybe_add_quotes( $item ) {
	// Matches strings that are not exclusively alphabetic characters or hyphens, and do not exactly follow the pattern generic(alphabetic characters or hyphens).
	$regex = '/^(?!generic\([a-zA-Z\-]+\)$)(?!^[a-zA-Z\-]+$).+/';
	$item  = trim( $item );
	if ( preg_match( $regex, $item ) ) {
		$item = trim( $item, "\"'" );
		return '"' . $item . '"';
	}
	return $item;
}

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