diff --git a/src/kyupy/vcd.py b/src/kyupy/vcd.py
index abf0b95..5e2839f 100644
--- a/src/kyupy/vcd.py
+++ b/src/kyupy/vcd.py
@@ -41,6 +41,9 @@ class Scope:
             s = s.parent_scope
         return '/'.join(reversed(parts))
 
+    def __repr__(self) -> str:
+        return self.path
+
 
 class VcdHeader:
     def __init__(self) -> None:
@@ -99,10 +102,12 @@ class VcdVarMap:
 
 
 class VcdData:
-    def __init__(self, var_map, steps, data):
+    def __init__(self, var_map: VcdVarMap, steps, data):
         self.var_map = var_map
         self.steps = steps
         self.data = data
+    def __repr__(self) -> str:
+        return f'{{variables: {len(self.var_map.var_list)}, bits: {self.data.shape[0]}, steps: {self.data.shape[1]}}}'
 
 
 class VcdHeaderTransformer(Transformer):
@@ -124,9 +129,9 @@ class VcdHeaderTransformer(Transformer):
 
     def var(self, args):
         type, width, idcode, reference = args
-        reference = reference.strip()
+        reference = reference.value.strip()
         width = int(width)
-        self.header.add_var(type, width, idcode, reference)
+        self.header.add_var(type.value, width, idcode.value, reference)
 
     def start(self, args):
         return self.header