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<?php

namespace Invoker\ParameterResolver;

use ReflectionFunctionAbstract;

/**
 * Dispatches the call to other resolvers until all parameters are resolved.
 *
 * Chain of responsibility pattern.
 *
 * @author Matthieu Napoli <matthieu@mnapoli.fr>
 */
class ResolverChain implements ParameterResolver
{
    /**
     * @var ParameterResolver[]
     */
    private $resolvers = array();

public function __construct(array $resolvers = array())
    {
        $this->resolvers = $resolvers;
    }

public function getParameters(
        ReflectionFunctionAbstract $reflection,
        array $providedParameters,
        array $resolvedParameters
    ) {
        $reflectionParameters = $reflection->getParameters();

foreach ($this->resolvers as $resolver) {
            $resolvedParameters = $resolver->getParameters(
                $reflection,
                $providedParameters,
                $resolvedParameters
            );

$diff = array_diff_key($reflectionParameters, $resolvedParameters);
            if (empty($diff)) {
                // Stop traversing: all parameters are resolved
                return $resolvedParameters;
            }
        }

return $resolvedParameters;
    }

/**
     * Push a parameter resolver after the ones already registered.
     *
     * @param ParameterResolver $resolver
     */
    public function appendResolver(ParameterResolver $resolver)
    {
        $this->resolvers[] = $resolver;
    }

/**
     * Insert a parameter resolver before the ones already registered.
     *
     * @param ParameterResolver $resolver
     */
    public function prependResolver(ParameterResolver $resolver)
    {
        array_unshift($this->resolvers, $resolver);
    }
}