Support NODE_IVAR

ext/mjollnir/mjollnir.c

@@ -252,6 +252,16 @@ node_args_to_hash(const NODE *node)
     return result;
 }
 
+static VALUE
+node_ivar_to_hash(const NODE *node)
+{
+    VALUE result = rb_hash_new();
+
+    rb_hash_aset(result, rb_str_new2("vid"), ID2SYM(RNODE_IVAR(node)->nd_vid));
+
+    return result;
+}
+
 static VALUE
 ast_to_hash(const NODE *node)
 {
@@ -344,6 +354,11 @@ ast_to_hash(const NODE *node)
 	  rb_hash_aset(result, rb_str_new2("NODE_BEGIN"), node_begin_to_hash(node));
 	  return result;
 	}
+	case NODE_IVAR: {
+	  VALUE result = rb_hash_new();
+	  rb_hash_aset(result, rb_str_new2("NODE_IVAR"), node_ivar_to_hash(node));
+	  return result;
+	}
 	case NODE_INTEGER:
 	case NODE_FLOAT:
 	case NODE_RATIONAL:

test/mjollnir/parse_ivar_test.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class ParseIvarTest < Minitest::Test
+  def test_parse_ivar
+    result = Mjollnir.parse('@mjollnir')
+
+    expected = {
+      'NODE_SCOPE' => {
+        'args' => nil,
+        'body' => {
+          'NODE_IVAR' => {
+            'vid' => :@mjollnir
+          }
+        }
+      }
+    }
+
+    assert_equal expected, result
+  end
+end