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[red-knot] Add control flow support for match statement (#13241)

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## Summary

This PR adds support for control flow for match statement.

It also adds the necessary infrastructure required for narrowing
constraints in case blocks and implements the logic for
`PatternMatchSingleton` which is either `None` / `True` / `False`. Even
after this the inferred type doesn't get simplified completely, there's
a TODO for that in the test code.

## Test Plan

Add test cases for control flow for (a) when there's a wildcard pattern
and (b) when there isn't. There's also a test case to verify the
narrowing logic.

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
This commit is contained in:
Dhruv Manilawala 2024-09-10 02:14:19 +05:30 • committed by GitHub
parent 6f53aaf931
commit 62c7d8f6ba
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9 changed files with 321 additions and 37 deletions
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16
crates/ruff_python_ast_integration_tests/tests/match_pattern.rs Normal file
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use ruff_python_parser::parse_module;
#[test]
fn pattern_is_wildcard() {
let source_code = r"
match subject:
case _ as x: ...
case _ | _: ...
case _: ...
";
let parsed = parse_module(source_code).unwrap();
let cases = &parsed.syntax().body[0].as_match_stmt().unwrap().cases;
for case in cases {
assert!(case.pattern.is_wildcard());
}
}