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| 1 | <?php |
| 2 | |
| 3 | namespace MobileFrontend\Transforms\Utils; |
| 4 | |
| 5 | /** |
| 6 | * Simple utility for working with html classes as with set |
| 7 | */ |
| 8 | class HtmlClassUtils { |
| 9 | /** |
| 10 | * Parse html class string into set (array of string=>bool) where key is class name |
| 11 | * and values is always true |
| 12 | * |
| 13 | * @param string $classAttr raw `class` attribute's string retrieved from html |
| 14 | * |
| 15 | * @return array |
| 16 | */ |
| 17 | public static function parseClassString( string $classAttr ): array { |
| 18 | $classes = preg_split( '/\s+/', $classAttr, -1, PREG_SPLIT_NO_EMPTY ); |
| 19 | return array_fill_keys( $classes, true ); |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * Forms raw html `class` string from set of classes. Set is a key-value array where |
| 24 | * key is class name and value is boolean that determines wheather this class should be |
| 25 | * included to string or not. |
| 26 | * |
| 27 | * |
| 28 | * @param array $classes set of classes that should be formed into string |
| 29 | * |
| 30 | * @return string |
| 31 | */ |
| 32 | public static function formClassString( array $classes ): string { |
| 33 | $enabled = array_filter( |
| 34 | $classes, |
| 35 | static function ( $enabled ) { |
| 36 | return $enabled; |
| 37 | } |
| 38 | ); |
| 39 | return implode( ' ', array_keys( $enabled ) ); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Filters set of classes by list of allowed classes |
| 44 | * |
| 45 | * @param array $classes key-value array of html classes |
| 46 | * @param string[] $allowedClasses list of allowed classes |
| 47 | * @param string[] $additional list of additional styles should be added in front of list |
| 48 | * |
| 49 | * @return array |
| 50 | */ |
| 51 | public static function filterAllowedClasses( array $classes, array $allowedClasses, array $additional ): array { |
| 52 | return array_fill_keys( $additional, true ) + array_intersect_key( |
| 53 | $classes, |
| 54 | array_fill_keys( $allowedClasses, true ) |
| 55 | ); |
| 56 | } |
| 57 | } |