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fix: accept signed offsets in the Jinja2 {% now %} tag - #13653
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_get_datetime built the shift amount by string concatenation,
float(operator + value.strip()), so an offset whose value already carries a
sign produced an invalid literal: {% now 'UTC' + 'hours=-2' %} raised
ValueError: could not convert string to float: '+-2'.
Parse the value numerically first and apply the operator's sign afterwards,
so operator and value sign compose. An invalid operator is still rejected.
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Related Issues
Proposed Changes:
Jinja2TimeExtension._get_datetimebuilt the shift amount by string concatenation:float(operator + value.strip()). For an offset value that already carries a sign — e.g.{% now 'UTC' + 'hours=-2' %}— that produced the literal"+-2"and raisedValueError: could not convert string to float: '+-2', so the tag could not express a negative offset under an explicit+. The value is now parsed numerically first and the operator's sign is applied afterwards, so the operator and the value's own sign compose (+/-2-> -2,-/-2-> +2). An invalid operator is still rejected explicitly, preserving the previousValueError.Example now supported:
{% now 'UTC' + 'days=-1, hours=-2' %}.How did you test it?
Added parametrized unit tests in
test/utils/test_jinja2_extensions.pycovering signed values under both+and-, signed multi-interval offsets, and equivalence of{% now 'UTC' + 'hours=-2' %}with{% now 'UTC' - 'hours=2' %}.test/utils/test_jinja2_extensions.py: 24 passed (was 17; the 7 new tests fail on the unpatched source withcould not convert string to float: '+-2').test/utilsregression: 591 passed / 2 pre-existing environment failures (missingtorchintest_device.py), identical on a clean tree (584 passed / same 2 failures).ruff checkandruff formatclean.Notes for the reviewer
The explicit
operator not in ("+", "-")guard is deliberate: a sign-multiplier-only implementation would silently accept an invalid operator and break the existingtest_invalid_operator, so the invalid-operator contract is preserved rather than replaced.This PR was fully generated with an AI assistant. I have reviewed the changes and run the relevant tests.