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utils: fix subscript checking for python 3.9 (#49608)

This commit is contained in:
Benjamin Dauvergne 2020-12-18 14:51:06 +01:00
parent ae5a9c0b3d
commit 081a4e5798
1 changed files with 12 additions and 4 deletions
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16
src/authentic2/utils/evaluate.py
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@ -183,10 +183,18 @@ class ConditionValidator(BaseExpressionValidator):
def check_Subscript(self, node):
# check subscript are constant number or strings
if (not isinstance(node.slice, ast.Index)
or not isinstance(node.slice.value, CONSTANT_CLASSES)
# with python <3.8 the node class is enough to determine the value
or (sys.version_info >= (3, 8) and not isinstance(node.slice.value.value, (int, str, bytes)))):
ok = True
if sys.version_info >= (3, 9):
ok = isinstance(node.slice, CONSTANT_CLASSES)
elif sys.version_info >= (3, 8):
ok = (
isinstance(node.slice, ast.Index)
and isinstance(node.slice.value, CONSTANT_CLASSES)
and isinstance(node.slice.value.value, (int, str, bytes))
)
else:
ok = isinstance(node.slice, ast.Index) and isinstance(node.slice.value, CONSTANT_CLASSES)
if not ok:
raise ExpressionError(_('subscript index MUST be a constant'), code='invalid-subscript', node=node)