Add new required attribute to ensure compatibility

composer.json

@@ -9,8 +9,8 @@
         "roave/security-advisories": "dev-master",
         "php": ">=5.5.9",
         "twig/twig": "~1.24",
-        "erusev/parsedown": "~1.7",
-        "erusev/parsedown-extra": "~0.7",
+        "erusev/parsedown": "dev-master",
+        "erusev/parsedown-extra": "dev-master",
         "symfony/yaml": "~2.8",
         "symfony/console": "~2.8",
         "symfony/event-dispatcher": "~2.8",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "a8a5c0cb1969632422711809e4d55e06",
+    "content-hash": "7f11c43893137f2af50de7c8e1eab00d",
     "packages": [
         {
             "name": "antoligy/dom-string-iterators",
@@ -295,16 +295,16 @@
         },
         {
             "name": "erusev/parsedown",
-            "version": "1.7.1",
+            "version": "dev-master",
             "source": {
                 "type": "git",
                 "url": "https://github.com/erusev/parsedown.git",
-                "reference": "92e9c27ba0e74b8b028b111d1b6f956a15c01fc1"
+                "reference": "8091e5586ad8f164b56d6b1e0b9d0722bf460144"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/erusev/parsedown/zipball/92e9c27ba0e74b8b028b111d1b6f956a15c01fc1",
-                "reference": "92e9c27ba0e74b8b028b111d1b6f956a15c01fc1",
+                "url": "https://api.github.com/repos/erusev/parsedown/zipball/8091e5586ad8f164b56d6b1e0b9d0722bf460144",
+                "reference": "8091e5586ad8f164b56d6b1e0b9d0722bf460144",
                 "shasum": ""
             },
             "require": {
@@ -337,24 +337,30 @@
                 "markdown",
                 "parser"
             ],
-            "time": "2018-03-08T01:11:30+00:00"
+            "time": "2018-04-09T15:53:07+00:00"
         },
         {
             "name": "erusev/parsedown-extra",
-            "version": "0.7.1",
+            "version": "dev-master",
             "source": {
                 "type": "git",
                 "url": "https://github.com/erusev/parsedown-extra.git",
-                "reference": "0db5cce7354e4b76f155d092ab5eb3981c21258c"
+                "reference": "51cdff11d89e1471e447fda487bbee4956b207c0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/erusev/parsedown-extra/zipball/0db5cce7354e4b76f155d092ab5eb3981c21258c",
-                "reference": "0db5cce7354e4b76f155d092ab5eb3981c21258c",
+                "url": "https://api.github.com/repos/erusev/parsedown-extra/zipball/51cdff11d89e1471e447fda487bbee4956b207c0",
+                "reference": "51cdff11d89e1471e447fda487bbee4956b207c0",
                 "shasum": ""
             },
             "require": {
-                "erusev/parsedown": "~1.4"
+                "erusev/parsedown": "^1.8.0|dev-master",
+                "ext-dom": "*",
+                "ext-mbstring": "*",
+                "php": ">=5.3.6"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35"
             },
             "type": "library",
             "autoload": {
@@ -381,7 +387,7 @@
                 "parsedown",
                 "parser"
             ],
-            "time": "2015-11-01T10:19:22+00:00"
+            "time": "2018-04-08T01:24:10+00:00"
         },
         {
             "name": "filp/whoops",
@@ -3761,6 +3767,8 @@
     "minimum-stability": "stable",
     "stability-flags": {
         "roave/security-advisories": 20,
+        "erusev/parsedown": 20,
+        "erusev/parsedown-extra": 20,
         "victorjonsson/markdowndocs": 20
     },
     "prefer-stable": false,

system/src/Grav/Common/Markdown/ParsedownGravTrait.php

@@ -59,9 +59,17 @@ trait ParsedownGravTrait
      * @param bool $continuable
      * @param bool $completable
      * @param $index
+     * @param bool $allow this is mandatory to pass through to be compatible with Parsedow 1.8.0
      */
-    public function addBlockType($type, $tag, $continuable = false, $completable = false, $index = null)
+    public function addBlockType($type, $tag, $continuable = false, $completable = false, $index = null, $allow = false)
     {
+        // This mandatory attribute ensures that only updated and compatible plugins
+        // will be able to add the blocktype attributes, as old plugins that have not been updated
+        // can break Grav completely until the plugin is disabled
+        if (!$allow) {
+            return;
+        }
+
         $block = &$this->unmarkedBlockTypes;
         if ($type) {
             if (!isset($this->BlockTypes[$type])) {
@@ -168,7 +176,9 @@ trait ParsedownGravTrait
     protected function blockTwigTag($line)
     {
         if (preg_match('/(?:{{|{%|{#)(.*)(?:}}|%}|#})/', $line['body'], $matches)) {
-            return ['markup' => $line['body']];
+            return ['element' => [
+                'rawHtml' => $line['body']
+            ]];
         }
 
         return null;