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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Boiler; |
| 6 | |
| 7 | use Celema\Boiler\Exception\UnexpectedValueException; |
| 8 | use ReflectionClass; |
| 9 | use ReflectionMethod; |
| 10 | |
| 11 | /** @internal */ |
| 12 | final class Methods |
| 13 | { |
| 14 | /** @var array<non-empty-string, Method> */ |
| 15 | private array $methods = []; |
| 16 | |
| 17 | /** |
| 18 | * A template's registry layers over its engine's: methods added here stay |
| 19 | * on the template, while methods added to the engine, even later, remain |
| 20 | * visible unless the template overrides them. |
| 21 | */ |
| 22 | public function __construct( |
| 23 | private readonly ?self $parent = null, |
| 24 | ) {} |
| 25 | |
| 26 | /** @param non-empty-string $name */ |
| 27 | public function add(string $name, callable $callable, bool $safe = false): void |
| 28 | { |
| 29 | if (self::isReserved($name)) { |
| 30 | throw new UnexpectedValueException("Method name `{$name}` is reserved by a template helper"); |
| 31 | } |
| 32 | |
| 33 | $this->methods[$name] = new Method($callable, $safe); |
| 34 | } |
| 35 | |
| 36 | public function get(string $name): Method |
| 37 | { |
| 38 | if (array_key_exists($name, $this->methods)) { |
| 39 | return $this->methods[$name]; |
| 40 | } |
| 41 | |
| 42 | if ($this->parent !== null) { |
| 43 | return $this->parent->get($name); |
| 44 | } |
| 45 | |
| 46 | throw new UnexpectedValueException("Method '{$name}' does not exist"); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Templates reach registered methods through Context::__call(), which PHP |
| 51 | * only calls for names the context does not define itself, ignoring case. |
| 52 | * Templates run in the scope of the context, so its non-public methods |
| 53 | * count too. |
| 54 | */ |
| 55 | private static function isReserved(string $name): bool |
| 56 | { |
| 57 | return in_array( |
| 58 | strtolower($name), |
| 59 | array_map( |
| 60 | static fn(ReflectionMethod $method): string => strtolower($method->name), |
| 61 | new ReflectionClass(Context::class)->getMethods(), |
| 62 | ), |
| 63 | true, |
| 64 | ); |
| 65 | } |
| 66 | } |