Merge pull request #74 from onbjerg/onbjerg/fix-global-using-directive

fix: support global using directives

Author: JoranHonig

grammar.js

@@ -161,6 +161,7 @@ module.exports = grammar({
             $.constant_variable_declaration,
             $.user_defined_type_definition,
             $.event_definition,
+            $.using_directive,
         ),
 
         user_defined_type_definition: $ => seq(
@@ -294,14 +295,45 @@ module.exports = grammar({
             optional(field("name", $.identifier)),
         ),
 
+        user_definable_operator: $ => choice(
+            "&",
+            "~",
+            "|",
+            "^",
+            "+",
+            "-",
+            "/",
+            "%",
+            "*",
+            "-",
+            "==",
+            ">",
+            ">=",
+            "<",
+            "<=",
+            "!=",
+        ),
+
         using_directive: $ => seq(
             'using',
-            alias($.user_defined_type, $.type_alias),
+            choice(
+                alias($.user_defined_type, $.type_alias),
+                seq('{', commaSep1($.using_alias), '}')
+            ),
             'for',
             field("source", choice($.any_source_type, $.type_name)),
+            optional('global'),
             $._semicolon
         ),
 
+        using_alias: $ => seq(
+            $.user_defined_type,
+            optional(seq(
+                "as",
+                $.user_definable_operator,
+            ))
+        ),
+
         any_source_type: $ => '*',
 
         // -- [ Statements ] --