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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css\Value; |
| 6 | |
| 7 | /** |
| 8 | * `var(--name, <fallback>)` — an unresolved reference to a custom property. |
| 9 | * |
| 10 | * Lives untouched in the value tree until the cascade resolves it: when a |
| 11 | * computed style is being built for an element, the cascade walks up the |
| 12 | * inheritance chain looking for `--name` and substitutes its value here. |
| 13 | * If no chain entry has it, the fallback is used; if there's no fallback |
| 14 | * either, the property becomes invalid at computed-value time and the |
| 15 | * cascade falls back to the initial value. |
| 16 | */ |
| 17 | final readonly class CustomProperty extends Value |
| 18 | { |
| 19 | public function __construct(public string $name, public ?Value $fallback = null) {} |
| 20 | |
| 21 | public function toCss(): string |
| 22 | { |
| 23 | if ($this->fallback !== null) { |
| 24 | return sprintf('var(%s, %s)', $this->name, $this->fallback->toCss()); |
| 25 | } |
| 26 | return sprintf('var(%s)', $this->name); |
| 27 | } |
| 28 | } |