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Allow type variable tuple for *args

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This commit is contained in:
Charlie Marsh 2023-02-23 08:37:44 -05:00
parent 1404660364
commit 8b9f57906a
3 changed files with 214 additions and 7 deletions
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21
parser/python.lalrpop
View file

@ -1180,7 +1180,7 @@ FuncDef: ast::Stmt = {
};
Parameters: ast::Arguments = {
"(" <a: (ParameterList<TypedParameter>)?> ")" =>? {
"(" <a: (ParameterList<TypedParameter, StarTypedParameter>)?> ")" =>? {
let args = validate_arguments(
a.unwrap_or_else(|| ast::Arguments {
posonlyargs: vec![],
@ -1199,8 +1199,8 @@ Parameters: ast::Arguments = {
// Note that this is a macro which is used once for function defs, and
// once for lambda defs.
ParameterList<ArgType>: ast::Arguments = {
<param1:ParameterDefs<ArgType>> <args2:("," ParameterListStarArgs<ArgType>)?> ","? =>? {
ParameterList<ArgType, StarArgType>: ast::Arguments = {
<param1:ParameterDefs<ArgType>> <args2:("," ParameterListStarArgs<ArgType, StarArgType>)?> ","? =>? {
let (posonlyargs, args, defaults) = parse_params(param1)?;
// Now gather rest of parameters:
@ -1235,7 +1235,7 @@ ParameterList<ArgType>: ast::Arguments = {
kw_defaults,
})
},
<params:ParameterListStarArgs<ArgType>> ","? => {
<params:ParameterListStarArgs<ArgType, StarArgType>> ","? => {
let (vararg, kwonlyargs, kw_defaults, kwarg) = params;
ast::Arguments {
posonlyargs: vec![],
@ -1291,11 +1291,18 @@ TypedParameter: ast::Arg = {
},
};
StarTypedParameter: ast::Arg = {
<location:@L> <arg:Identifier> <a:(":" TestOrStarExpr)?> <end_location:@R> => {
let annotation = a.map(|x| Box::new(x.1));
ast::Arg::new(location, end_location, ast::ArgData { arg, annotation, type_comment: None })
},
};
// Use inline here to make sure the "," is not creating an ambiguity.
// TODO: figure out another grammar that makes this inline no longer required.
#[inline]
ParameterListStarArgs<ArgType>: (Option<Box<ast::Arg>>, Vec<ast::Arg>, Vec<ast::Expr>, Option<Box<ast::Arg>>) = {
<location:@L> "*" <va:ArgType?> <kw:("," ParameterDef<ArgType>)*> <kwarg:("," KwargParameter<ArgType>)?> =>? {
ParameterListStarArgs<ArgType, StarArgType>: (Option<Box<ast::Arg>>, Vec<ast::Arg>, Vec<ast::Expr>, Option<Box<ast::Arg>>) = {
<location:@L> "*" <va:StarArgType?> <kw:("," ParameterDef<ArgType>)*> <kwarg:("," KwargParameter<ArgType>)?> =>? {
// Extract keyword arguments:
let mut kwonlyargs = Vec::new();
let mut kw_defaults = Vec::new();
@ -1413,7 +1420,7 @@ NamedExpression: ast::Expr = {
};
LambdaDef: ast::Expr = {
<location:@L> "lambda" <p:ParameterList<UntypedParameter>?> ":" <body:Test<"all">> <end_location:@R> =>? {
<location:@L> "lambda" <p:ParameterList<UntypedParameter, UntypedParameter>?> ":" <body:Test<"all">> <end_location:@R> =>? {
let p = validate_arguments(
p.unwrap_or_else(|| {
ast::Arguments {

12
parser/src/parser.rs
View file

@ -803,6 +803,18 @@ match x:
match x:
case (0,):
y = 0
"#,
"<test>",
)
.unwrap();
insta::assert_debug_snapshot!(parse_ast);
}
#[test]
fn test_variadic_generics() {
let parse_ast = parse_program(
r#"
def args_to_tuple(*args: *Ts) -> Tuple[*Ts]: ...
"#,
"<test>",
)

188
parser/src/snapshots/rustpython_parser__parser__tests__variadic_generics.snap Normal file
View file

@ -0,0 +1,188 @@
---
source: compiler/parser/src/parser.rs
expression: parse_ast
---
[
Located {
location: Location {
row: 2,
column: 0,
},
end_location: Some(
Location {
row: 2,
column: 48,
},
),
custom: (),
node: FunctionDef {
name: "args_to_tuple",
args: Arguments {
posonlyargs: [],
args: [],
vararg: Some(
Located {
location: Location {
row: 2,
column: 19,
},
end_location: Some(
Location {
row: 2,
column: 28,
},
),
custom: (),
node: ArgData {
arg: "args",
annotation: Some(
Located {
location: Location {
row: 2,
column: 25,
},
end_location: Some(
Location {
row: 2,
column: 28,
},
),
custom: (),
node: Starred {
value: Located {
location: Location {
row: 2,
column: 26,
},
end_location: Some(
Location {
row: 2,
column: 28,
},
),
custom: (),
node: Name {
id: "Ts",
ctx: Load,
},
},
ctx: Load,
},
},
),
type_comment: None,
},
},
),
kwonlyargs: [],
kw_defaults: [],
kwarg: None,
defaults: [],
},
body: [
Located {
location: Location {
row: 2,
column: 45,
},
end_location: Some(
Location {
row: 2,
column: 48,
},
),
custom: (),
node: Expr {
value: Located {
location: Location {
row: 2,
column: 45,
},
end_location: Some(
Location {
row: 2,
column: 48,
},
),
custom: (),
node: Constant {
value: Ellipsis,
kind: None,
},
},
},
},
],
decorator_list: [],
returns: Some(
Located {
location: Location {
row: 2,
column: 33,
},
end_location: Some(
Location {
row: 2,
column: 43,
},
),
custom: (),
node: Subscript {
value: Located {
location: Location {
row: 2,
column: 33,
},
end_location: Some(
Location {
row: 2,
column: 38,
},
),
custom: (),
node: Name {
id: "Tuple",
ctx: Load,
},
},
slice: Located {
location: Location {
row: 2,
column: 39,
},
end_location: Some(
Location {
row: 2,
column: 42,
},
),
custom: (),
node: Starred {
value: Located {
location: Location {
row: 2,
column: 40,
},
end_location: Some(
Location {
row: 2,
column: 42,
},
),
custom: (),
node: Name {
id: "Ts",
ctx: Load,
},
},
ctx: Load,
},
},
ctx: Load,
},
},
),
type_comment: None,
},
},
]