(Supersedes #9152, authored by @LaBatata101)
## Summary
This PR replaces the current parser generated from LALRPOP to a
hand-written recursive descent parser.
It also updates the grammar for [PEP
646](https://peps.python.org/pep-0646/) so that the parser outputs the
correct AST. For example, in `data[*x]`, the index expression is now a
tuple with a single starred expression instead of just a starred
expression.
Beyond the performance improvements, the parser is also error resilient
and can provide better error messages. The behavior as seen by any
downstream tools isn't changed. That is, the linter and formatter can
still assume that the parser will _stop_ at the first syntax error. This
will be updated in the following months.
For more details about the change here, refer to the PR corresponding to
the individual commits and the release blog post.
## Test Plan
Write _lots_ and _lots_ of tests for both valid and invalid syntax and
verify the output.
## Acknowledgements
- @MichaReiser for reviewing 100+ parser PRs and continuously providing
guidance throughout the project
- @LaBatata101 for initiating the transition to a hand-written parser in
#9152
- @addisoncrump for implementing the fuzzer which helped
[catch](https://github.com/astral-sh/ruff/pull/10903)
[a](https://github.com/astral-sh/ruff/pull/10910)
[lot](https://github.com/astral-sh/ruff/pull/10966)
[of](https://github.com/astral-sh/ruff/pull/10896)
[bugs](https://github.com/astral-sh/ruff/pull/10877)
---------
Co-authored-by: Victor Hugo Gomes <labatata101@linuxmail.org>
Co-authored-by: Micha Reiser <micha@reiser.io>
Add pylint rule invalid-length-returned (PLE0303)
See https://github.com/astral-sh/ruff/issues/970 for rules
Test Plan: `cargo test`
TBD: from the description: "Strictly speaking `bool` is a subclass of
`int`, thus returning `True`/`False` is valid. To be consistent with
other rules (e.g.
[PLE0305](https://github.com/astral-sh/ruff/pull/10962)
invalid-index-returned), ruff will raise, compared to pylint which will
not raise."
## Summary
If the user is analyzing a script (i.e., we have no module path), it
seems reasonable to use the script name when trying to identify paths to
objects defined _within_ the script.
Closes https://github.com/astral-sh/ruff/issues/10960.
## Test Plan
Ran:
```shell
check --isolated --select=B008 \
--config 'lint.flake8-bugbear.extend-immutable-calls=["test.A"]' \
test.py
```
On:
```python
class A: pass
def f(a=A()):
pass
```
## Summary
This PR switches more callsites of `SemanticModel::is_builtin` to move
over to the new methods I introduced in #10919, which are more concise
and more accurate. I missed these calls in the first PR.
## Summary
This change adds a rule to detect functions declared `async` but lacking
any of `await`, `async with`, or `async for`. This resolves#9951.
## Test Plan
This change was tested by following
https://docs.astral.sh/ruff/contributing/#rule-testing-fixtures-and-snapshots
and adding positive and negative cases for each of `await` vs nothing,
`async with` vs `with`, and `async for` vs `for`.
## Summary
This PR moves the `Q003` rule to AST checker.
This is the final rule that used the docstring detection state machine
and thus this PR removes it as well.
resolves: #7595resolves: #7808
## Test Plan
- [x] `cargo test`
- [x] Make sure there are no changes in the ecosystem
## Summary
Adds more aggressive logic to PLR1730, `if-stmt-min-max`
Closes#10907
## Test Plan
`cargo test`
---------
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>
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## Summary
Hi! 👋
Thanks for sharing ruff as software libre — it helps me keep Python code
quality up with pre-commit, both locally and CI 🙏
While studying the examples at
https://docs.astral.sh/ruff/rules/function-uses-loop-variable/#example I
noticed that the last of the examples had a bug: prior to this fix, `ì`
was passed to the lambda for `x` rather than for `i` — the two are
mixed-up. The reason it's easy to overlook is because addition is an
commutative operation and so `x + i` and `i + x` give the same result
(and least with integers), despite the mix-up. For proof, let me demo
the relevant part with before and after:
```python
In [1]: from functools import partial
In [2]: [partial(lambda x, i: (x, i), i)(123) for i in range(3)]
Out[2]: [(0, 123), (1, 123), (2, 123)]
In [3]: [partial(lambda x, i: (x, i), i=i)(123) for i in range(3)]
Out[3]: [(123, 0), (123, 1), (123, 2)]
```
Does that make sense?
## Test Plan
<!-- How was it tested? -->
Was manually tested using IPython.
CC @r4f @grandchild
## Summary
If `RUF100` was included in a per-file-ignore, we respected it on cases
like `# noqa: F401`, but not the blanket variant (`# noqa`).
Closes https://github.com/astral-sh/ruff/issues/10906.
## Summary
Implement new rule: Prefer augmented assignment (#8877). It checks for
the assignment statement with the form of `<expr> = <expr>
<binary-operator> …` with a unsafe fix to use augmented assignment
instead.
## Test Plan
1. Snapshot test is included in the PR.
2. Manually test with playground.
## Summary
This PR adds the implementation for the current
[flake8-bugbear](https://github.com/PyCQA/flake8-bugbear)'s B038 rule.
The B038 rule checks for mutation of loop iterators in the body of a for
loop and alerts when found.
Rational:
Editing the loop iterator can lead to undesired behavior and is probably
a bug in most cases.
Closes#9511.
Note there will be a second iteration of B038 implemented in
`flake8-bugbear` soon, and this PR currently only implements the weakest
form of the rule.
I'd be happy to also implement the further improvements to B038 here in
ruff 🙂
See https://github.com/PyCQA/flake8-bugbear/issues/454 for more
information on the planned improvements.
## Test Plan
Re-using the same test file that I've used for `flake8-bugbear`, which
is included in this PR (look for the `B038.py` file).
Note: this is my first time using `rust` (beside `rustlings`) - I'd be
very happy about thorough feedback on what I could've done better
🙂 - Bring it on 😀
## Summary
Code cleanup for per-file ignores; use a struct instead of a tuple.
Named the structs for individual ignores and the list of ignores
`CompiledPerFileIgnore` and `CompiledPerFileIgnoreList`. Name choice is
because we already have a `PerFileIgnore` struct for a
pre-compiled-matchers form of the config. Name bikeshedding welcome.
## Test Plan
Refactor, should not change behavior; existing tests pass.
---------
Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
## Summary
Implement `write-whole-file` (`FURB103`), part of #1348. This is largely
a copy and paste of `read-whole-file` #7682.
## Test Plan
Text fixture added.
---------
Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>
## Summary
Improve `blanket-noqa` error message in cases where codes are provided
but not detected due to formatting issues. Namely `# noqa X100` (missing
colon) or `noqa : X100` (space before colon). The behavior is similar to
`NQA002` and `NQA003` from `flake8-noqa` mentioned in #850. The idea to
merge the rules into `PGH004` was suggested by @MichaReiser
https://github.com/astral-sh/ruff/pull/10325#issuecomment-2025535444.
## Test Plan
Test cases added to fixture.
Fixes#3172
## Summary
Allow prefixing [extend-]per-file-ignores patterns with `!` to negate
the pattern; listed rules / prefixes will be ignored in all files that
don't match the pattern.
## Test Plan
Added tests for the feature.
Rendered docs and checked rendered output.
## Summary
Came across this code while digging into the semantic model with
@AlexWaygood, and found it confusing because of how it splits
`push_scope` from the paired `pop_scope` (took me a few minutes to even
figure out if/where we were popping the pushed scope). Since this
"cleanup" is already totally split by node type, there doesn't seem to
be any gain in having it as a separate "step" rather than just
incorporating it into the traversal clauses for those node types.
I left the equivalent cleanup step alone for the expression case,
because in that case it is actually generic across several different
node types, and due to the use of the common `visit_generators` utility
there isn't a clear way to keep the pushes and corresponding pops
localized.
Feel free to just reject this if I've missed a good reason for it to
stay this way!
## Test Plan
Tests and clippy.
## Summary
Fixes#3011.
Type checkers currently allow forward references in all contexts in stub
files, and stubs frequently make use of this capability (although it
doesn't actually seem to be specc'd anywhere --neither in PEP 484, nor
https://typing.readthedocs.io/en/latest/source/stubs.html#id6, nor the
CPython typing docs). Implementing it so that Ruff allows forward
references in _all contexts_ in stub files seems non-trivial, however
(or at least, I couldn't figure out how to do it easily), so this PR
does not do that. Perhaps it _should_; if we think this apporach isn't
principled enough, I'm happy to close it and postpone changing anything
here.
However, this does reduce the number of F821 errors Ruff emits on
typeshed down from 76 to 2, which would mean that we could enable the
rule at typeshed. The remaining 2 F821 errors can be trivially fixed at
typeshed by moving definitions around; forward references in class bases
were really the only remaining places where there was a real _use case_
for forward references in stub files that Ruff wasn't yet allowing.
## Test plan
`cargo test`. I also ran this PR branch on typeshed to check to see if
there were any new false positives caused by the changes here; there
were none.
## Summary
`Path.read_bytes()` does not support any keyword arguments, so `FURB101`
should not be triggered if the file is opened in `rb` mode with any
keyword arguments.
## Test Plan
Move erroneous test to "Non-error" section of fixture.
## Summary
Historically, given:
```python
__all__ = [ # noqa: F822
"Bernoulli",
"Beta",
"Binomial",
]
```
The F822 violations would be attached to the `__all__`, so this `# noqa`
would be enforced for _all_ definitions in the list. This changed in
https://github.com/astral-sh/ruff/pull/10525 for the better, in that we
now use the range of each string. But these `# noqa` directives stopped
working.
This PR sets the `__all__` as a parent range in the diagnostic, so that
these directives are respected once again.
Closes https://github.com/astral-sh/ruff/issues/10795.
## Test Plan
`cargo test`
Dhruv Manilawala
Alex Waygood
Charlie Marsh
Tibor Reiss
Zanie Blue
Philipp Thiel
plredmond
Micha Reiser
Steve C
Hoël Bagard
Sebastian Pipping
wolfgangshi
Martin Imre
Carl Meyer
Auguste Lalande
Carl Meyer
Aleksei Latyshev