Refactored TwigExtensions Part 1

src/Twig/TwigCoreExtension.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Twig;
+
+use App\Entity\Base\AbstractDBElement;
+use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+use Twig\TwigTest;
+
+/**
+ * The functionalities here extend the Twig with some core functions, which are independently of Part-DB.
+ */
+class TwigCoreExtension extends AbstractExtension
+{
+    protected $objectNormalizer;
+
+    public function __construct(ObjectNormalizer $objectNormalizer)
+    {
+        $this->objectNormalizer = $objectNormalizer;
+    }
+
+    public function getTests(): array
+    {
+        return [
+            /*
+             * Checks if a given variable is an instance of a given class. E.g. ` x is instanceof('App\Entity\Parts\Part')`
+             */
+            new TwigTest('instanceof', static function ($var, $instance) {
+                return $var instanceof $instance;
+            }),
+            /* Checks if a given variable is an object. E.g. `x is object` */
+            new TwigTest('object', static function ($var) {
+                return is_object($var);
+            }),
+        ];
+    }
+
+    public function getFilters()
+    {
+        return [
+            /* Converts the given object to an array representation of the public/accessible properties  */
+            new TwigFilter('to_array', [$this, 'toArray']),
+        ];
+    }
+
+    public function toArray($object)
+    {
+        if(! is_object($object) && ! is_array($object)) {
+            throw new \InvalidArgumentException('The given variable is not an object or array!');
+        }
+
+        //If it is already an array, we can just return it
+        if(is_array($object)) {
+            return $object;
+        }
+
+        return $this->objectNormalizer->normalize($object, null);
+    }
+}