* Document codes.rs
* Refactor codes.rs before merging
Helper script:
```python
# %%
from pathlib import Path
codes = Path("crates/ruff/src/codes.rs").read_text().splitlines()
rules = Path("a.txt").read_text().strip().splitlines()
rule_map = {i.split("::")[-1]: i for i in rules}
# %%
codes_new = []
for line in codes:
if ", Rule::" in line:
left, right = line.split(", Rule::")
right = right[:-2]
line = left + ", " + rule_map[right] + "),"
codes_new.append(line)
# %%
Path("crates/ruff/src/codes.rs").write_text("\n".join(codes_new))
```
Co-authored-by: Jonathan Plasse <13716151+JonathanPlasse@users.noreply.github.com>
This PR introduces a new `CacheKey` trait for types that can be used as a cache key.
I'm not entirely sure if this is worth the "overhead", but I was surprised to find `HashableHashSet` and got scared when I looked at the time complexity of the `hash` function. These implementations must be extremely slow in hashed collections.
I then searched for usages and quickly realized that only the cache uses these `Hash` implementations, where performance is less sensitive.
This PR introduces a new `CacheKey` trait to communicate the difference between a hash and computing a key for the cache. The new trait can be implemented for types that don't implement `Hash` for performance reasons, and we can define additional constraints on the implementation: For example, we'll want to enforce portability when we add remote caching support. Using a different trait further allows us not to implement it for types without stable identities (e.g. pointers) or use other implementations than the standard hash function.
Currently the define_rule_mapping! macro generates both the Rule enum as
well as the RuleCodePrefix enum and the mapping between the two. After
this commit series the macro will only generate the Rule enum and the
RuleCodePrefix enum and the mapping will be generated by a new map_codes
proc macro, so we rename the macro now to fit its new purpose.
```console
❯ cargo run rule B017
Finished dev [unoptimized + debuginfo] target(s) in 0.13s
Running `target/debug/ruff rule B017`
no-assert-raises-exception
Code: B017 (flake8-bugbear)
### What it does
Checks for `self.assertRaises(Exception)`.
## Why is this bad?
`assertRaises(Exception)` can lead to your test passing even if the
code being tested is never executed due to a typo.
Either assert for a more specific exception (builtin or custom), use
`assertRaisesRegex` or the context manager form of `assertRaises`.
```
