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Eliminating undefined parameters entirely by NeverUndefined #1924

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Eliminating undefined parameters entirely by NeverUndefined #1924

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89e9ad1
Update runtime.py
James4Ever0 Jan 3, 2024
0bd6223
Update __init__.py
James4Ever0 Jan 3, 2024
c860541
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jan 3, 2024
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1 change: 1 addition & 0 deletions src/jinja2/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@
from .runtime import ChainableUndefined as ChainableUndefined
from .runtime import DebugUndefined as DebugUndefined
from .runtime import make_logging_undefined as make_logging_undefined
from .runtime import NeverUndefined as NeverUndefined
from .runtime import StrictUndefined as StrictUndefined
from .runtime import Undefined as Undefined
from .utils import clear_caches as clear_caches
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17 changes: 17 additions & 0 deletions src/jinja2/runtime.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1052,3 +1052,20 @@ class StrictUndefined(Undefined):
DebugUndefined.__slots__,
StrictUndefined.__slots__,
)


class NeverUndefined(StrictUndefined):
def __init__(self, *args, **kwargs):
# ARGS: ("parameter 'myvar2' was not provided",)
# KWARGS: {'name': 'myvar2'}
if len(args) == 1:
info = args[0]
elif "name" in kwargs.keys():
info = f"Undefined variable '{kwargs['name']}"
else:
infoList = ["Not allowing any undefined variable."]
infoList.append(f"ARGS: {args}")
infoList.append(f"KWARGS: {kwargs}")
info = "\n".join(infoList)

raise Exception(info)
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