first version

kirby/src/Toolkit/Controller.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace Kirby\Toolkit;
+
+use Closure;
+use Exception;
+use ReflectionFunction;
+
+/**
+ * A smart extension of Closures with
+ * magic dependency injection based on the
+ * defined variable names.
+ */
+class Controller
+{
+    protected $function;
+
+    public function __construct(Closure $function)
+    {
+        $this->function = $function;
+    }
+
+    public function arguments(array $data = []): array
+    {
+        $info = new ReflectionFunction($this->function);
+        $args = [];
+
+        foreach ($info->getParameters() as $parameter) {
+            $name = $parameter->getName();
+
+            if (isset($data[$name]) === false) {
+                throw new Exception(sprintf('The "%s" parameter is missing', $name));
+            }
+
+            $args[] = $data[$name];
+        }
+
+        return $args;
+    }
+
+    public function call($bind = null, $data = [])
+    {
+        $args = $this->arguments($data);
+
+        if ($bind === null) {
+            return call_user_func($this->function, ...$args);
+        }
+
+        return $this->function->call($bind, ...$args);
+    }
+
+    public static function load(string $file)
+    {
+        if (file_exists($file) === false) {
+            return null;
+        }
+
+        $function = require $file;
+
+        if (is_a($function, 'Closure') === false) {
+            return null;
+        }
+
+        return new static($function);
+    }
+}