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Remove pythonic int * list behavior (#10292)

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# Description
The pythonism that multiplying a scalar integer with a list results in a
repeated concatenation of the list, is ambiguous with other possible
interpretations and thus actively harmful to clear semantics in nushell.

Another possible reading of this scalar/vector product would be trying
to perform elementwise multiplication with the scalar.

Before we bless this alternative as a more reasonable design the best
course of action is to remove this pythonism.

Work related to #10233


# User-Facing Changes
Breaking change as this turns `int * list` or `list * int` into hard
errors.

# Tests + Formatting
Remove the associated test
This commit is contained in:
Stefan Holderbach 2023-09-13 00:43:49 +02:00 committed by GitHub
parent ba6d8ad261
commit 3e14dc3eb8
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3 changed files with 0 additions and 24 deletions
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8
crates/nu-command/tests/commands/math/mod.rs
View file

@ -506,11 +506,3 @@ fn int_multiple_string() {
let actual = nu!(pipeline(r#""ab" * 3"#));
assert_eq!(actual.out, "ababab");
}
#[test]
fn int_multiple_list() {
let actual = nu!(pipeline(r#"3 * [1 2] | to nuon"#));
assert_eq!(actual.out, "[1, 2, 1, 2, 1, 2]");
let actual = nu!(pipeline(r#"[1 2] * 3 | to nuon"#));
assert_eq!(actual.out, "[1, 2, 1, 2, 1, 2]");
}

2
crates/nu-parser/src/type_check.rs
View file

@ -241,8 +241,6 @@ pub fn math_result_type(
(Type::Float, Type::Duration) => (Type::Duration, None),
(Type::Int, Type::String) => (Type::String, None),
(Type::String, Type::Int) => (Type::String, None),
(Type::Int, Type::List(a)) => (Type::List(a.clone()), None),
(Type::List(a), Type::Int) => (Type::List(a.clone()), None),
(Type::Custom(a), Type::Custom(b)) if a == b => (Type::Custom(a.to_string()), None),
(Type::Custom(a), _) => (Type::Custom(a.to_string()), None),

14
crates/nu-protocol/src/value/mod.rs
View file

@ -2663,20 +2663,6 @@ impl Value {
}
Ok(Value::string(res, span))
}
(Value::Int { val: lhs, .. }, Value::List { vals: rhs, .. }) => {
let mut res = vec![];
for _ in 0..*lhs {
res.append(&mut rhs.clone())
}
Ok(Value::list(res, span))
}
(Value::List { vals: lhs, .. }, Value::Int { val: rhs, .. }) => {
let mut res = vec![];
for _ in 0..*rhs {
res.append(&mut lhs.clone())
}
Ok(Value::list(res, span))
}
_ => Err(ShellError::OperatorMismatch {
op_span: op,
lhs_ty: self.get_type().to_string(),