parser: add generic type and expression

Fixes #84

grammar.js

@@ -243,8 +243,23 @@ module.exports = grammar({
       ),
 
     class_type: ($) => seq(kw("CLASS"), choice($.identifier, $.qualified_name)),
+    generic_parameter: ($) => seq($.identifier, $.type_tuning),
+    generic_expression: ($) =>
+      seq(
+        "<",
+        _list(choice($.identifier, $.qualified_name, $.generic_parameter), ","),
+        ">"
+      ),
+    generic_type: ($) =>
+      seq(choice($.identifier, $.qualified_name), $.generic_expression),
     _type: ($) =>
-      choice($.primitive_type, $.identifier, $.qualified_name, $.class_type),
+      choice(
+        $.primitive_type,
+        $.identifier,
+        $.qualified_name,
+        $.class_type,
+        $.generic_type
+      ),
 
     when_expression: ($) => seq(kw("WHEN"), $._expression),
     assignment: ($) =>

test/corpus/basic.txt

@@ -2164,6 +2164,9 @@ VAR INT x = a + b , y = a - b, z = x - y.
 /* Indeterminate integer array initialized using expressions */
 VAR INT[ ] x = [funct( ), a + b].
 
+/* Generic type */
+var List<Ant> ListOfAnts.
+
 --------------------------------------------------------------------------------
 
 (source_code
@@ -2472,7 +2475,16 @@ VAR INT[ ] x = [funct( ), a + b].
             (arguments))
           (additive_expression
             (identifier)
-            (identifier)))))))
+            (identifier))))))
+  (comment)
+  (var_statement
+    (type_tuning
+      (generic_type
+        (identifier)
+        (generic_expression
+          (identifier))))
+    (variable
+      (identifier))))
 
 ================================================================================
 RUN statement