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Remove exception-handler lexing from unused-bound-exception fix (#5851)

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## Summary

The motivation here is that it will make this rule easier to rewrite as
a deferred check. Right now, we can't run this rule in the deferred
phase, because it depends on the `except_handler` to power its autofix.
Instead of lexing the `except_handler`, we can use the `SimpleTokenizer`
from the formatter, and just lex forwards and backwards.

For context, this rule detects the unused `e` in:

```python
try:
  pass
except ValueError as e:
  pass
```
This commit is contained in:
Charlie Marsh 2023-07-18 14:27:46 -04:00 • committed by GitHub
parent 41da52a61b
commit 4204fc002d
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GPG key ID: 4AEE18F83AFDEB23
32 changed files with 125 additions and 112 deletions
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19
crates/ruff_python_formatter/src/expression/expr_slice.rs
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@ -1,16 +1,17 @@
use crate::comments::{dangling_comments, SourceComment};
use crate::context::PyFormatContext;
use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
use crate::trivia::Token;
use crate::trivia::{first_non_trivia_token, TokenKind};
use crate::{AsFormat, FormatNodeRule, PyFormatter};
use ruff_formatter::prelude::{hard_line_break, line_suffix_boundary, space, text};
use ruff_formatter::{write, Buffer, Format, FormatError, FormatResult};
use ruff_python_ast::node::{AnyNodeRef, AstNode};
use ruff_text_size::TextRange;
use rustpython_parser::ast::ExprSlice;
use rustpython_parser::ast::{Expr, Ranged};
use ruff_formatter::prelude::{hard_line_break, line_suffix_boundary, space, text};
use ruff_formatter::{write, Buffer, Format, FormatError, FormatResult};
use ruff_python_ast::node::{AnyNodeRef, AstNode};
use ruff_python_whitespace::{first_non_trivia_token, Token, TokenKind};
use crate::comments::{dangling_comments, SourceComment};
use crate::context::PyFormatContext;
use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
use crate::{AsFormat, FormatNodeRule, PyFormatter};
#[derive(Default)]
pub struct FormatExprSlice;