added child_html twig function for safe output of child blocks

Author: thampe

Framework/View/TemplateEngine/Twig.php

@@ -4,6 +4,7 @@
 
 use Magento\Framework\ObjectManagerInterface;
 use Magento\Framework\Event\ManagerInterface;
+use Magento\Framework\View\Element\AbstractBlock;
 use Magento\Framework\View\TemplateEngine\Php;
 use Magento\Framework\App\Helper\AbstractHelper;
 use Magento\Framework\View\Element\BlockInterface;
@@ -87,6 +88,11 @@ private function initTwig()
         $this->twig->addFunction(new \Twig\TwigFunction('layoutBlock', [$this, 'layoutBlock']));
         $this->twig->addFunction(new \Twig\TwigFunction('get*', [$this, 'catchGet']));
         $this->twig->addFunction(new \Twig\TwigFunction('isset', [$this, '__isset']));
+        $this->twig->addFunction(new \Twig\TwigFunction('child_html', [$this, 'getChildHtml'], [
+            'needs_context' => true,
+            'is_safe' => ['html']
+        ]));
+
         $this->twig->addFilter(new \Twig\TwigFilter('trans', '__'));
         $this->twig->addExtension(new \Twig\Extension\DebugExtension());
         foreach ($this->getDefinedFunctionsInHelpersFile() as $functionName) {
@@ -198,6 +204,18 @@ public function helper($className)
         return $helper;
     }
 
+    public function getChildHtml(array $context, $alias = '', $useCache = true)
+    {
+        if (!isset($context['block'])) {
+            return null;
+        }
+        $block = $context['block'];
+        if (!$block instanceof AbstractBlock) {
+            return null;
+        }
+        return $block->getChildHtml($alias, $useCache);
+    }
+
     /**
      * @return array
      * @throws \Magento\Framework\Exception\FileSystemException

composer.json

@@ -9,7 +9,7 @@
         "twig/twig": "~2.0"
     },
     "type": "magento2-module",
-    "version": "1.8.0",
+    "version": "1.8.1",
     "license": [
         "OSL-3.0"
     ],

etc/module.xml

@@ -1,5 +1,5 @@
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
-    <module name="SchumacherFM_Twig" setup_version="1.1.4">
+    <module name="SchumacherFM_Twig" setup_version="1.8.1">
         <sequence>
             <module name="Magento_Core" />
             <module name="Magento_Backend" />