Added GrammarRegistry::has

README.md

@@ -215,6 +215,7 @@ $element = MensBeam\Lit\Highlight::toElement($code, $grammar->scopeName);
 * Go
 * Go modules
 * Go templates
+* HTML
 * Java
 * Java expression language
 * Java properties

lib/GrammarRegistry.php

@@ -39,6 +39,17 @@ class GrammarRegistry {
         return false;
     }
 
+    /**
+     * Retrieves whether a grammar exists in the registry or not.
+     *
+     * @param string $scopeName - The scope name (eg: text.html.php) of the grammar that is being requested
+     * @return bool
+     */
+    public static function has(string $scopeName): bool {
+        $result = array_key_exists($scopeName, self::$storage);
+        return $result ?: file_exists(__DIR__ . "/../data/$scopeName.json");
+    }
+
     /**
      * Sets a grammar in the registry.
      *