mirrors/ruff
1
0
Fork 0
mirror of https://github.com/astral-sh/ruff.git synced 2025-08-04 02:38:25 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 3

Add syntax error for empty type parameter list (#12030)

Browse source 
## Summary

(I'm pretty sure I added this in the parser re-write but must've got
lost in the rebase?)

This PR raises a syntax error if the type parameter list is empty.

As per the grammar, there should be at least one type parameter:
```
type_params: 
    | invalid_type_params
    | '[' type_param_seq ']' 

type_param_seq: ','.type_param+ [','] 
```

Verified via the builtin `ast` module as well:
```console    
$ python3.13 -m ast parser/_.py
Traceback (most recent call last):
  [..]
  File "parser/_.py", line 1
    def foo[]():
            ^
SyntaxError: Type parameter list cannot be empty
```

## Test Plan

Add inline test cases and update the snapshots.
This commit is contained in:
Dhruv Manilawala 2024-06-26 08:10:35 +05:30 • committed by GitHub
parent 83fe44728b
commit 7cb2619ef5
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
4 changed files with 116 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

102
crates/ruff_python_parser/tests/snapshots/invalid_syntax@type_params_empty.py.snap Normal file
View file

@ -0,0 +1,102 @@
---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/err/type_params_empty.py
---
## AST
```
Module(
ModModule {
range: 0..52,
body: [
FunctionDef(
StmtFunctionDef {
range: 0..21,
is_async: false,
decorator_list: [],
name: Identifier {
id: "foo",
range: 4..7,
},
type_params: Some(
TypeParams {
range: 7..9,
type_params: [],
},
),
parameters: Parameters {
range: 9..11,
posonlyargs: [],
args: [],
vararg: None,
kwonlyargs: [],
kwarg: None,
},
returns: None,
body: [
Pass(
StmtPass {
range: 17..21,
},
),
],
},
),
TypeAlias(
StmtTypeAlias {
range: 22..51,
name: Name(
ExprName {
range: 27..36,
id: "ListOrSet",
ctx: Store,
},
),
type_params: Some(
TypeParams {
range: 36..38,
type_params: [],
},
),
value: BinOp(
ExprBinOp {
range: 41..51,
left: Name(
ExprName {
range: 41..45,
id: "list",
ctx: Load,
},
),
op: BitOr,
right: Name(
ExprName {
range: 48..51,
id: "set",
ctx: Load,
},
),
},
),
},
),
],
},
)
```
## Errors
|
1 | def foo[]():
| ^ Syntax Error: Type parameter list cannot be empty
2 | pass
3 | type ListOrSet[] = list | set
|
|
1 | def foo[]():
2 | pass
3 | type ListOrSet[] = list | set
| ^ Syntax Error: Type parameter list cannot be empty
|