first commit

vendor/php-di/invoker/src/ParameterResolver/ResolverChain.php

@@ -0,0 +1,61 @@
+<?php declare(strict_types=1);
+
+namespace Invoker\ParameterResolver;
+
+use ReflectionFunctionAbstract;
+
+/**
+ * Dispatches the call to other resolvers until all parameters are resolved.
+ *
+ * Chain of responsibility pattern.
+ */
+class ResolverChain implements ParameterResolver
+{
+    /** @var ParameterResolver[] */
+    private $resolvers;
+
+    public function __construct(array $resolvers = [])
+    {
+        $this->resolvers = $resolvers;
+    }
+
+    public function getParameters(
+        ReflectionFunctionAbstract $reflection,
+        array $providedParameters,
+        array $resolvedParameters
+    ): array {
+        $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.
+     */
+    public function appendResolver(ParameterResolver $resolver): void
+    {
+        $this->resolvers[] = $resolver;
+    }
+
+    /**
+     * Insert a parameter resolver before the ones already registered.
+     */
+    public function prependResolver(ParameterResolver $resolver): void
+    {
+        array_unshift($this->resolvers, $resolver);
+    }
+}