Expose quill parser format and blot classes

library/Vanilla/Formatting/Quill/Parser.php

@@ -312,4 +312,83 @@ private function stripTrailingNewlines(array &$operations) {
             $lastOp["insert"] = preg_replace('/\s+$/', "\n", $lastOp["insert"]);
         }
     }
+
+    /**
+     * Replace a registered blot class.
+     *
+     * @return bool
+     * @throws \Exception If the replacement class isn't a subclass of the existing blot class.
+     */
+    public function replaceBlot(string $newBlotClass, string $existingBlotClass): bool {
+       if (!is_subclass_of($newBlotClass, $existingBlotClass)) {
+            throw new \Exception($newBlotClass . " should be a subclass of " . $existingBlotClass);
+        }
+
+        $key = array_search($existingBlotClass, $this->blotClasses);
+
+        if ($key !== false) {
+            $this->blotClasses[$key] = $newBlotClass;
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Remove a registered blot class.
+     *
+     * @return bool
+     */
+    public function removeBlot(string $existingBlotClass): bool {
+        $key = array_search($existingBlotClass, $this->blotClasses);
+
+        if ($key !== false) {
+            unset($this->blotClasses[$key]);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Replace a registered format class.
+     *
+     * @return bool
+     * @throws \Exception If the replacement class isn't a subclass of the existing format class.
+     */
+    public function replaceFormat(string $newFormatClass, string $existingFormatClass): bool {
+        if (!is_subclass_of($newFormatClass, $existingFormatClass)) {
+            throw new \Exception($newFormatClass . " should be a subclass of " . $existingFormatClass);
+        }
+
+        $key = array_search($existingFormatClass, $this->formatClasses);
+
+        if ($key !== false) {
+            $this->formatClasses[$key] = $newFormatClass;
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Remove a registered format class.
+     *
+     * @return bool
+     */
+    public function removeFormat(string $existingFormatClass): bool {
+        $key = array_search($existingFormatClass, $this->formatClasses);
+
+        if ($key !== false) {
+            unset($this->formatClasses[$key]);
+
+            return true;
+        }
+
+        return false;
+    }
+
 }