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<?php |
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namespace Zenstruck; |
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use Zenstruck\Callback\Argument; |
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use Zenstruck\Callback\Exception\UnresolveableArgument; |
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use Zenstruck\Callback\Parameter; |
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/** |
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* @author Kevin Bond <[email protected]> |
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*/ |
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final class Callback implements \Countable |
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{ |
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/** @var \ReflectionFunction */ |
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private $function; |
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private function __construct(\ReflectionFunction $function) |
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{ |
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$this->function = $function; |
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} |
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public function __toString(): string |
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{ |
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if ($class = $this->function->getClosureScopeClass()) { |
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return "{$class->getName()}:{$this->function->getStartLine()}"; |
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} |
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return $this->function->getName(); |
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} |
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/** |
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* @param callable|\ReflectionFunction $value |
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*/ |
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public static function createFor($value): self |
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{ |
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if (\is_callable($value)) { |
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$value = new \ReflectionFunction(\Closure::fromCallable($value)); |
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} |
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if (!$value instanceof \ReflectionFunction) { |
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throw new \InvalidArgumentException('$value must be callable.'); |
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} |
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return new self($value); |
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} |
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/** |
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* Invoke the callable with the passed arguments. Arguments of type |
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* Zenstruck\Callback\Parameter are resolved before invoking. |
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* |
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* @param mixed|Parameter ...$arguments |
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* |
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* @return mixed |
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* |
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* @throws \ArgumentCountError If there is a argument count mismatch |
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* @throws UnresolveableArgument If the argument cannot be resolved |
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*/ |
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public function invoke(...$arguments) |
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{ |
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$functionArgs = $this->arguments(); |
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foreach ($arguments as $key => $parameter) { |
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if (!$parameter instanceof Parameter) { |
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continue; |
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} |
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if (!\array_key_exists($key, $functionArgs)) { |
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if (!$parameter->isOptional()) { |
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throw new \ArgumentCountError(\sprintf('No argument %d for callable. Expected type: "%s".', $key + 1, $parameter->type())); |
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} |
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$arguments[$key] = null; |
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continue; |
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} |
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try { |
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$arguments[$key] = $parameter->resolve($functionArgs[$key]); |
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} catch (UnresolveableArgument $e) { |
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throw new UnresolveableArgument(\sprintf('Unable to resolve argument %d for callback. Expected type: "%s". (%s)', $key + 1, $parameter->type(), $this), $e); |
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} |
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} |
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try { |
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return $this->function->invoke(...$arguments); |
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} catch (\ArgumentCountError $e) { |
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throw new \ArgumentCountError(\sprintf('Too few arguments passed to "%s". Expected %d, got %s.', $this, $this->function->getNumberOfRequiredParameters(), \count($arguments)), 0, $e); |
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} |
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} |
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/** |
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* Invoke the callable using the passed Parameter to resolve all callable |
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* arguments. |
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* |
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* @param int $min Enforce a minimum number of arguments the callable must have |
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* |
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* @return mixed |
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* |
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* @throws \ArgumentCountError If the number of arguments is less than $min |
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* @throws UnresolveableArgument If the argument cannot be resolved |
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*/ |
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public function invokeAll(Parameter $parameter, int $min = 0) |
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{ |
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if (\count($this) < $min) { |
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throw new \ArgumentCountError("{$min} argument(s) of type \"{$parameter->type()}\" required ({$this})."); |
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} |
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$arguments = $this->arguments(); |
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foreach ($arguments as $key => $argument) { |
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try { |
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$arguments[$key] = $parameter->resolve($argument); |
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} catch (UnresolveableArgument $e) { |
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throw new UnresolveableArgument(\sprintf('Unable to resolve argument %d for callback. Expected type: "%s". (%s)', $key + 1, $parameter->type(), $this), $e); |
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} |
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} |
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return $this->function->invoke(...$arguments); |
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} |
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/** |
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* @return Argument[] |
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*/ |
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public function arguments(): array |
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{ |
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return \array_map( |
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static function(\ReflectionParameter $parameter) { |
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return new Argument($parameter); |
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}, |
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$this->function->getParameters() |
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); |
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} |
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public function argument(int $index): Argument |
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{ |
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if (!isset(($arguments = $this->arguments())[$index])) { |
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throw new \OutOfRangeException(\sprintf('Argument %d does not exist for %s.', $index + 1, $this)); |
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} |
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return $arguments[$index]; |
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} |
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public function count(): int |
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{ |
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return $this->function->getNumberOfParameters(); |
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} |
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} |
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zenstruck /
callback
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