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vendor/laravel/framework/src/Illuminate/Routing/RouteSignatureParameters.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Illuminate\Routing;
+
+use Illuminate\Support\Reflector;
+use Illuminate\Support\Str;
+use ReflectionFunction;
+use ReflectionMethod;
+
+class RouteSignatureParameters
+{
+    /**
+     * Extract the route action's signature parameters.
+     *
+     * @param  array  $action
+     * @param  string|null  $subClass
+     * @return array
+     */
+    public static function fromAction(array $action, $subClass = null)
+    {
+        $parameters = is_string($action['uses'])
+                        ? static::fromClassMethodString($action['uses'])
+                        : (new ReflectionFunction($action['uses']))->getParameters();
+
+        return is_null($subClass) ? $parameters : array_filter($parameters, function ($p) use ($subClass) {
+            return Reflector::isParameterSubclassOf($p, $subClass);
+        });
+    }
+
+    /**
+     * Get the parameters for the given class / method by string.
+     *
+     * @param  string  $uses
+     * @return array
+     */
+    protected static function fromClassMethodString($uses)
+    {
+        [$class, $method] = Str::parseCallback($uses);
+
+        if (! method_exists($class, $method) && Reflector::isCallable($class, $method)) {
+            return [];
+        }
+
+        return (new ReflectionMethod($class, $method))->getParameters();
+    }
+}