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[red-knot] Handle StringLiteral truncation (#13276)

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When a type of the form `Literal["..."]` would be constructed with too
large of a string, this PR converts it to `LiteralString` instead.

We also extend inference for binary operations to include the case where
one of the operands is `LiteralString`.

Closes #13224
This commit is contained in:
Dylan 2024-09-07 22:25:09 -05:00 • committed by GitHub
parent a7c936878d
commit e4aa479515
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1 changed files with 95 additions and 11 deletions
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98
crates/red_knot_python_semantic/src/types/infer.rs
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@ -1426,13 +1426,14 @@ impl<'db> TypeInferenceBuilder<'db> {
}
fn infer_string_literal_expression(&mut self, literal: &ast::ExprStringLiteral) -> Type<'db> {
let value = if literal.value.len() <= Self::MAX_STRING_LITERAL_SIZE {
literal.value.to_str().into()
if literal.value.len() <= Self::MAX_STRING_LITERAL_SIZE {
Type::StringLiteral(StringLiteralType::new(
self.db,
literal.value.to_str().into(),
))
} else {
Box::default()
};
Type::StringLiteral(StringLiteralType::new(self.db, value))
Type::LiteralString
}
}
fn infer_bytes_literal_expression(&mut self, literal: &ast::ExprBytesLiteral) -> Type<'db> {
@ -2041,12 +2042,22 @@ impl<'db> TypeInferenceBuilder<'db> {
}
(Type::StringLiteral(lhs), Type::StringLiteral(rhs), ast::Operator::Add) => {
Type::StringLiteral(StringLiteralType::new(self.db, {
let lhs_value = lhs.value(self.db).to_string();
let rhs_value = rhs.value(self.db).as_ref();
if lhs_value.len() + rhs_value.len() <= Self::MAX_STRING_LITERAL_SIZE {
Type::StringLiteral(StringLiteralType::new(self.db, {
(lhs_value + rhs_value).into()
}))
} else {
Type::LiteralString
}
}
(
Type::StringLiteral(_) | Type::LiteralString,
Type::StringLiteral(_) | Type::LiteralString,
ast::Operator::Add,
) => Type::LiteralString,
(Type::StringLiteral(s), Type::IntLiteral(n), ast::Operator::Mult)
| (Type::IntLiteral(n), Type::StringLiteral(s), ast::Operator::Mult) => {
@ -2066,6 +2077,15 @@ impl<'db> TypeInferenceBuilder<'db> {
}
}
(Type::LiteralString, Type::IntLiteral(n), ast::Operator::Mult)
| (Type::IntLiteral(n), Type::LiteralString, ast::Operator::Mult) => {
if n < 1 {
Type::StringLiteral(StringLiteralType::new(self.db, Box::default()))
} else {
Type::LiteralString
}
}
_ => Type::Unknown, // TODO
}
}
@ -2892,6 +2912,70 @@ mod tests {
Ok(())
}
#[test]
fn multiplied_literal_string() -> anyhow::Result<()> {
let mut db = setup_db();
let content = format!(
r#"
v = "{y}"
w = 10*"{y}"
x = "{y}"*10
z = 0*"{y}"
u = (-100)*"{y}"
"#,
y = "a".repeat(TypeInferenceBuilder::MAX_STRING_LITERAL_SIZE + 1),
);
db.write_dedented("src/a.py", &content)?;
assert_public_ty(&db, "src/a.py", "v", "LiteralString");
assert_public_ty(&db, "src/a.py", "w", "LiteralString");
assert_public_ty(&db, "src/a.py", "x", "LiteralString");
assert_public_ty(&db, "src/a.py", "z", r#"Literal[""]"#);
assert_public_ty(&db, "src/a.py", "u", r#"Literal[""]"#);
Ok(())
}
#[test]
fn truncated_string_literals_become_literal_string() -> anyhow::Result<()> {
let mut db = setup_db();
let content = format!(
r#"
w = "{y}"
x = "a" + "{z}"
"#,
y = "a".repeat(TypeInferenceBuilder::MAX_STRING_LITERAL_SIZE + 1),
z = "a".repeat(TypeInferenceBuilder::MAX_STRING_LITERAL_SIZE),
);
db.write_dedented("src/a.py", &content)?;
assert_public_ty(&db, "src/a.py", "w", "LiteralString");
assert_public_ty(&db, "src/a.py", "x", "LiteralString");
Ok(())
}
#[test]
fn adding_string_literals_and_literal_string() -> anyhow::Result<()> {
let mut db = setup_db();
let content = format!(
r#"
v = "{y}"
w = "{y}" + "a"
x = "a" + "{y}"
z = "{y}" + "{y}"
"#,
y = "a".repeat(TypeInferenceBuilder::MAX_STRING_LITERAL_SIZE + 1),
);
db.write_dedented("src/a.py", &content)?;
assert_public_ty(&db, "src/a.py", "v", "LiteralString");
assert_public_ty(&db, "src/a.py", "w", "LiteralString");
assert_public_ty(&db, "src/a.py", "x", "LiteralString");
assert_public_ty(&db, "src/a.py", "z", "LiteralString");
Ok(())
}
#[test]
fn bytes_type() -> anyhow::Result<()> {
let mut db = setup_db();