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Reduce ambiguity for function parsing

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This commit is contained in:
Jeff 2024-06-18 21:44:22 -04:00
parent 7c809fa764
commit 799467b25b
3 changed files with 28 additions and 20 deletions
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42
dust-lang/src/parser.rs
View File

@ -84,9 +84,13 @@ pub fn parser<'src>(
.clone()
.separated_by(just(Token::Control(Control::Comma)))
.at_least(1)
.collect(),
.collect()
.delimited_by(
just(Token::Control(Control::Pipe)),
just(Token::Control(Control::Pipe)),
)
.or_not(),
)
.or_not()
.then(
type_constructor
.clone()
@ -226,9 +230,13 @@ pub fn parser<'src>(
.separated_by(just(Token::Control(Control::Comma)))
.at_least(1)
.allow_trailing()
.collect(),
.collect()
.delimited_by(
just(Token::Control(Control::Pipe)),
just(Token::Control(Control::Pipe)),
)
.or_not(),
)
.or_not()
.then(
identifier
.clone()
@ -939,26 +947,26 @@ mod tests {
#[test]
fn function_type() {
assert_eq!(
parse(&lex("type Foo = fn T (int) -> T").unwrap()).unwrap()[0],
parse(&lex("type Foo = fn |T| (int) -> T").unwrap()).unwrap()[0],
Statement::TypeAssignment(
TypeAssignment::new(
Identifier::new("Foo").with_position((5, 8)),
TypeConstructor::Function(
FunctionTypeConstructor {
type_parameters: Some(vec![
Identifier::new("T").with_position((14, 15))
Identifier::new("T").with_position((15, 16))
]),
value_parameters: vec![TypeConstructor::Type(
Type::Integer.with_position((17, 20))
Type::Integer.with_position((19, 22))
)],
return_type: Box::new(TypeConstructor::Identifier(
Identifier::new("T").with_position((25, 26))
Identifier::new("T").with_position((27, 28))
)),
}
.with_position((11, 26))
.with_position((11, 28))
)
)
.with_position((0, 26))
.with_position((0, 28))
)
);
}
@ -1048,7 +1056,7 @@ mod tests {
#[test]
fn function_with_type_arguments() {
assert_eq!(
parse(&lex("fn T, U (x: T, y: U) -> T { x }").unwrap()).unwrap()[0],
parse(&lex("fn |T, U| (x: T, y: U) -> T { x }").unwrap()).unwrap()[0],
Statement::Expression(Expression::Value(
ValueNode::Function {
type_parameters: Some(vec![Identifier::new("T"), Identifier::new("U"),]),
@ -1056,25 +1064,25 @@ mod tests {
(
Identifier::new("x"),
TypeConstructor::Identifier(
Identifier::new("T").with_position((12, 13))
Identifier::new("T").with_position((14, 15))
)
),
(
Identifier::new("y"),
TypeConstructor::Identifier(
Identifier::new("U").with_position((18, 19))
Identifier::new("U").with_position((20, 21))
)
)
],
return_type: TypeConstructor::Identifier(
Identifier::new("T").with_position((24, 25))
Identifier::new("T").with_position((26, 27))
),
body: Block::new(vec![Statement::Expression(Expression::Identifier(
Identifier::new("x").with_position((28, 29))
Identifier::new("x").with_position((30, 31))
))])
.with_position((26, 31)),
.with_position((28, 33)),
}
.with_position((0, 31))
.with_position((0, 33))
))
)
}

2
dust-lang/tests/functions.rs
View File

@ -6,7 +6,7 @@ fn function_call_with_type_argument() {
interpret(
"test",
"
foobar = fn T (x: T) -> T { x }
foobar = fn |T| (x: T) -> T { x }
foobar::(int)::(42)
",
),

2
std/json.ds
View File

@ -1,5 +1,5 @@
json = {
parse = fn T (input: str) -> T {
parse = fn |T| (input: str) -> T {
JSON_PARSE T input
}
}