Convert lists to tuples to make dict keys hashable, fixes #24

tests/test_utils.py

@@ -0,0 +1,12 @@
+from viewstate.utils import list_to_tuple
+
+
+def test_list_to_tuple():
+    assert list_to_tuple([1, 2, 3]) == (1, 2, 3)
+    assert list_to_tuple((9, 8, 7)) == (9, 8, 7)
+    assert list_to_tuple((None, [2, 3, None])) == (None, (2, 3, None))
+    assert list_to_tuple(("abc", [2, [3], (9, 8, True, False)])) == (
+        "abc",
+        (2, (3,), (9, 8, True, False)),
+    )
+    assert list_to_tuple("abc") == "abc"

viewstate/parse.py

@@ -2,6 +2,7 @@
 
 from .colors import COLORS
 from .exceptions import ViewStateException
+from .utils import list_to_tuple
 
 
 class ParserMeta(type):
@@ -250,7 +251,11 @@ def parse(b):
         for _ in range(n):
             k, remain = Parser.parse(remain)
             v, remain = Parser.parse(remain)
-            d[k] = v
+            try:
+                d[k] = v
+            except TypeError:
+                # make the key hashable by deep converting lists to tuples
+                d[list_to_tuple(k)] = v
         return d, remain
 
 

viewstate/utils.py

@@ -0,0 +1,5 @@
+def list_to_tuple(lst):
+    if isinstance(lst, list) or isinstance(lst, tuple):
+        return tuple([list_to_tuple(e) for e in lst])
+    else:
+        return lst