Support for PEP-570: positional-only arguments #170
Description
PEP-570 adds support for positional-only arguments.
Baron seem to support keyword-only arguments, as shown in test_case_1 below, which is represented by a kwargs_only_marker node.
Following this convention i propose creating a posargs_only_marker node for the test_case_2 example.
Testcase:
from redbaron import RedBaron
import ast, json
test_case_1 = "def foo(a, *, b, c): pass" # kwarg only
test_case_2 = "def foo(a, /, b, c): pass" # pos only
print(ast.dump(ast.parse(test_case_1), indent=4)) # dump python ast
print("=" * 60)
print(json.dumps(RedBaron(test_case_1).fst(), indent=4)) # dump redbaron ast
print("=" * 60)
print(ast.dump(ast.parse(test_case_2), indent=4)) # dump python ast
print("=" * 60)
print(json.dumps(RedBaron(test_case_2).fst(), indent=4)) # dump redbaron astExpand this to view output
Module(
body=[
FunctionDef(
name='foo',
args=arguments(
posonlyargs=[],
args=[
arg(arg='a')],
kwonlyargs=[
arg(arg='b'),
arg(arg='c')],
kw_defaults=[
None,
None],
defaults=[]),
body=[
Pass()],
decorator_list=[])],
type_ignores=[])
============================================================
[
{
"type": "def",
"async": false,
"name": "foo",
"decorators": [],
"async_formatting": [],
"first_formatting": [
{
"type": "space",
"value": " "
}
],
"second_formatting": [],
"third_formatting": [],
"arguments": [
{
"type": "def_argument",
"annotation_first_formatting": [],
"annotation_second_formatting": [],
"first_formatting": [],
"second_formatting": [],
"target": {
"type": "name",
"value": "a"
},
"annotation": {},
"value": {}
},
{
"type": "comma",
"first_formatting": [],
"second_formatting": [
{
"type": "space",
"value": " "
}
]
},
{
"type": "kwargs_only_marker",
"formatting": []
},
{
"type": "comma",
"first_formatting": [],
"second_formatting": [
{
"type": "space",
"value": " "
}
]
},
{
"type": "def_argument",
"annotation_first_formatting": [],
"annotation_second_formatting": [],
"first_formatting": [],
"second_formatting": [],
"target": {
"type": "name",
"value": "b"
},
"annotation": {},
"value": {}
},
{
"type": "comma",
"first_formatting": [],
"second_formatting": [
{
"type": "space",
"value": " "
}
]
},
{
"type": "def_argument",
"annotation_first_formatting": [],
"annotation_second_formatting": [],
"first_formatting": [],
"second_formatting": [],
"target": {
"type": "name",
"value": "c"
},
"annotation": {},
"value": {}
}
],
"fourth_formatting": [],
"return_annotation_first_formatting": [],
"return_annotation_second_formatting": [],
"fifth_formatting": [],
"sixth_formatting": [
{
"type": "space",
"value": " "
}
],
"value": [
{
"type": "pass"
},
{
"type": "endl",
"value": "\n",
"indent": "",
"formatting": []
}
],
"return_annotation": {}
}
]
============================================================
Module(
body=[
FunctionDef(
name='foo',
args=arguments(
posonlyargs=[
arg(arg='a')],
args=[
arg(arg='b'),
arg(arg='c')],
kwonlyargs=[],
kw_defaults=[],
defaults=[]),
body=[
Pass()],
decorator_list=[])],
type_ignores=[])
============================================================
Traceback (most recent call last):
File "/home/pbsds/.cache/pypoetry/virtualenvs/fix-my-functions-Moge_7ev-py3.9/lib/python3.9/site-packages/baron/baron.py", line 20, in _parse
return parser(tokens)
File "/home/pbsds/.cache/pypoetry/virtualenvs/fix-my-functions-Moge_7ev-py3.9/lib/python3.9/site-packages/baron/grammator.py", line 836, in parse
return parser.parse(iter(tokens))
File "/home/pbsds/.cache/pypoetry/virtualenvs/fix-my-functions-Moge_7ev-py3.9/lib/python3.9/site-packages/baron/parser.py", line 165, in parse
raise ParsingError(debug_output)
baron.parser.ParsingError: Error, got an unexpected token SLASH here:
1 def foo(a, /<---- here
The token SLASH should be one of those: COMMA, DOUBLE_STAR, LEFT_PARENTHESIS, NAME, RIGHT_PARENTHESIS, STAR