debug variant parsing

blueprintcompiler/utils.py

@@ -19,6 +19,7 @@
 
 import typing as T
 from dataclasses import dataclass
+import itertools
 
 
 class Colors:
@@ -154,3 +155,17 @@ def unescape_quote(string: str) -> str:
         i += 1
 
     return result
+
+def iter_batched(iterable, n, *, strict=False):
+    """
+    Replacement for `itertools.batched()` since the testing infrastructure
+    uses Python 3.9 at the moment. Copied directly off of the Python docs.
+    """
+    # batched('ABCDEFG', 3) → ABC DEF G
+    if n < 1:
+        raise ValueError('n must be at least one')
+    iterator = iter(iterable)
+    while batch := tuple(itertools.islice(iterator, n)):
+        if strict and len(batch) != n:
+            raise ValueError('batched(): incomplete batch')
+        yield batch