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efrain |
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<?php declare(strict_types=1);
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namespace Invoker;
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use Invoker\Exception\NotCallableException;
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use Invoker\Exception\NotEnoughParametersException;
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use Invoker\ParameterResolver\AssociativeArrayResolver;
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use Invoker\ParameterResolver\DefaultValueResolver;
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use Invoker\ParameterResolver\NumericArrayResolver;
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use Invoker\ParameterResolver\ParameterResolver;
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use Invoker\ParameterResolver\ResolverChain;
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use Invoker\Reflection\CallableReflection;
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use Psr\Container\ContainerInterface;
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use ReflectionParameter;
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/**
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* Invoke a callable.
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*/
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class Invoker implements InvokerInterface
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{
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/** @var CallableResolver|null */
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private $callableResolver;
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/** @var ParameterResolver */
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private $parameterResolver;
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/** @var ContainerInterface|null */
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private $container;
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public function __construct(?ParameterResolver $parameterResolver = null, ?ContainerInterface $container = null)
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{
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$this->parameterResolver = $parameterResolver ?: $this->createParameterResolver();
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$this->container = $container;
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if ($container) {
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$this->callableResolver = new CallableResolver($container);
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function call($callable, array $parameters = [])
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{
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if ($this->callableResolver) {
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$callable = $this->callableResolver->resolve($callable);
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}
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if (! is_callable($callable)) {
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throw new NotCallableException(sprintf(
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'%s is not a callable',
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is_object($callable) ? 'Instance of ' . get_class($callable) : var_export($callable, true)
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));
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}
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$callableReflection = CallableReflection::create($callable);
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$args = $this->parameterResolver->getParameters($callableReflection, $parameters, []);
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// Sort by array key because call_user_func_array ignores numeric keys
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ksort($args);
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// Check all parameters are resolved
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$diff = array_diff_key($callableReflection->getParameters(), $args);
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$parameter = reset($diff);
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if ($parameter && \assert($parameter instanceof ReflectionParameter) && ! $parameter->isVariadic()) {
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throw new NotEnoughParametersException(sprintf(
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'Unable to invoke the callable because no value was given for parameter %d ($%s)',
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$parameter->getPosition() + 1,
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$parameter->name
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));
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}
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return call_user_func_array($callable, $args);
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}
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/**
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* Create the default parameter resolver.
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*/
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private function createParameterResolver(): ParameterResolver
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{
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return new ResolverChain([
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new NumericArrayResolver,
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new AssociativeArrayResolver,
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new DefaultValueResolver,
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]);
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}
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/**
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* @return ParameterResolver By default it's a ResolverChain
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*/
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public function getParameterResolver(): ParameterResolver
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{
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return $this->parameterResolver;
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}
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public function getContainer(): ?ContainerInterface
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{
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return $this->container;
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}
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/**
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* @return CallableResolver|null Returns null if no container was given in the constructor.
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*/
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public function getCallableResolver(): ?CallableResolver
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{
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return $this->callableResolver;
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}
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}
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