Fixed twig parsing errors in pages where twig is parsed after markdown [

#3162]

CHANGELOG.md

@@ -8,6 +8,7 @@
     * Fixed `bin/gpm selfupgrade` failing to report failed Grav update [#3116](https://github.com/getgrav/grav/issues/3116)
     * Fixed `bin/gpm selfupgrade` error on `Call to undefined method` [#3160](https://github.com/getgrav/grav/issues/3160)
     * Flex Pages: Fixed fatal error when trying to move a page to Root (/) [#3161](https://github.com/getgrav/grav/issues/3161)
+    * Fixed twig parsing errors in pages where twig is parsed after markdown [#3162](https://github.com/getgrav/grav/issues/3162)
 
 # v1.7.0
 ## 01/19/2021

system/src/Grav/Common/Page/Page.php

@@ -783,7 +783,7 @@ public function content($var = null)
                         Grav::instance()->fireEvent('onPageContentProcessed', new Event(['page' => $this]));
                     } else {
                         if ($process_markdown) {
-                            $this->processMarkdown();
+                            $this->processMarkdown($process_twig);
                         }
 
                         // Content Processed but not cached yet
@@ -871,9 +871,10 @@ public function setContentMeta($content_meta)
     /**
      * Process the Markdown content.  Uses Parsedown or Parsedown Extra depending on configuration
      *
+     * @param bool $keepTwig If true, content between twig tags will not be processed.
      * @return void
      */
-    protected function processMarkdown()
+    protected function processMarkdown(bool $keepTwig = false)
     {
         /** @var Config $config */
         $config = Grav::instance()['config'];
@@ -905,7 +906,27 @@ protected function processMarkdown()
             $parsedown = new Parsedown($excerpts);
         }
 
-        $this->content = $parsedown->text($this->content);
+        $content = $this->content;
+        if ($keepTwig) {
+            // Base64 encode any twig.
+            $content = preg_replace_callback(
+                ['/({#)(.*?)(#})/mu', '/({{)(.*?)(}})/mu', '/({%)(.*?)(%})/mu'],
+                static function ($matches) { return $matches[1] . base64_encode($matches[2]) . $matches[3]; },
+                $content
+            );
+        }
+        $content = $parsedown->text($content);
+
+        if ($keepTwig) {
+            // Base64 decode the encoded twig.
+            $content = preg_replace_callback(
+                ['/({#)(.*?)(#})/mu', '/({{)(.*?)(}})/mu', '/({%)(.*?)(%})/mu'],
+                static function ($matches) { return $matches[1] . base64_decode($matches[2]) . $matches[3]; },
+                $content
+            );
+        }
+
+        $this->content = $content;
     }
 
 

system/src/Grav/Framework/Flex/Pages/Traits/PageContentTrait.php

@@ -734,6 +734,7 @@ protected function processContent($content): string
                 $grav->fireEvent('onPageContentProcessed', new Event(['page' => $this]));
             } else {
                 if ($process_markdown) {
+                    $options['keep_twig'] = $process_twig;
                     $this->_content = $this->processMarkdown($this->_content, $options);
                 }
 
@@ -807,7 +808,28 @@ protected function processMarkdown($content, array $options = []): string
             $parsedown = new Parsedown($excerpts);
         }
 
-        return $parsedown->text($content);
+        $keepTwig = (bool)($options['keep_twig'] ?? false);
+        if ($keepTwig) {
+            // Base64 encode any twig.
+            $content = preg_replace_callback(
+                ['/({#)(.*?)(#})/mu', '/({{)(.*?)(}})/mu', '/({%)(.*?)(%})/mu'],
+                static function ($matches) { return $matches[1] . base64_encode($matches[2]) . $matches[3]; },
+                $content
+            );
+        }
+
+        $content = $parsedown->text($content);
+
+        if ($keepTwig) {
+            // Base64 decode the encoded twig.
+            $content = preg_replace_callback(
+                ['/({#)(.*?)(#})/mu', '/({{)(.*?)(}})/mu', '/({%)(.*?)(%})/mu'],
+                static function ($matches) { return $matches[1] . base64_decode($matches[2]) . $matches[3]; },
+                $content
+            );
+        }
+
+        return $content;
     }
 
     abstract protected function loadHeaderProperty(string $property, $var, callable $filter);