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bpo-40493: fix function type comment parsing #19894

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Merged
miss-islington merged 4 commits into from
May 4, 2020
+78 −0
Merged

bpo-40493: fix function type comment parsing #19894

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0a3c990
grammar: allow *args and **kwargs without normal arguments for func_type
May 4, 2020
541fba6
test_type_comments: test *args and **kwargs without normal args
May 4, 2020
3df691b
Update Grammar/python.gram
hauntsaninja May 4, 2020
7370e68
Regenerate parser
May 4, 2020
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4 changes: 4 additions & 0 deletions Grammar/python.gram
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,10 @@ type_expressions[asdl_seq*]:
_PyPegen_seq_append_to_end(p, CHECK(_PyPegen_seq_append_to_end(p, a, b)), c) }
| a=','.expression+ ',' '*' b=expression { _PyPegen_seq_append_to_end(p, a, b) }
| a=','.expression+ ',' '**' b=expression { _PyPegen_seq_append_to_end(p, a, b) }
| '*' a=expression ',' '**' b=expression {
_PyPegen_seq_append_to_end(p, CHECK(_PyPegen_singleton_seq(p, a)), b) }
| '*' a=expression { _PyPegen_singleton_seq(p, a) }
| '**' a=expression { _PyPegen_singleton_seq(p, a) }
| ','.expression+

statements[asdl_seq*]: a=statement+ { _PyPegen_seq_flatten(p, a) }
Expand Down
8 changes: 8 additions & 0 deletions Lib/test/test_type_comments.py
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Expand Up @@ -399,6 +399,14 @@ def parse_func_type_input(source):
self.assertEqual(tree.argtypes[2].id, "Any")
self.assertEqual(tree.returns.id, "float")

tree = parse_func_type_input("(*int) -> None")
self.assertEqual(tree.argtypes[0].id, "int")
tree = parse_func_type_input("(**int) -> None")
self.assertEqual(tree.argtypes[0].id, "int")
tree = parse_func_type_input("(*int, **str) -> None")
self.assertEqual(tree.argtypes[0].id, "int")
self.assertEqual(tree.argtypes[1].id, "str")

with self.assertRaises(SyntaxError):
tree = parse_func_type_input("(int, *str, *Any) -> float")

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66 changes: 66 additions & 0 deletions Parser/pegen/parse.c
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Expand Up @@ -825,6 +825,9 @@ fstring_rule(Parser *p)
// | ','.expression+ ',' '*' expression ',' '**' expression
// | ','.expression+ ',' '*' expression
// | ','.expression+ ',' '**' expression
// | '*' expression ',' '**' expression
// | '*' expression
// | '**' expression
// | ','.expression+
static asdl_seq*
type_expressions_rule(Parser *p)
Expand Down Expand Up @@ -915,6 +918,69 @@ type_expressions_rule(Parser *p)
}
p->mark = mark;
}
{ // '*' expression ',' '**' expression
expr_ty a;
expr_ty b;
Token * literal;
Token * literal_1;
Token * literal_2;
if (
(literal = _PyPegen_expect_token(p, 16))
&&
(a = expression_rule(p))
&&
(literal_1 = _PyPegen_expect_token(p, 12))
&&
(literal_2 = _PyPegen_expect_token(p, 35))
&&
(b = expression_rule(p))
)
{
res = _PyPegen_seq_append_to_end ( p , CHECK ( _PyPegen_singleton_seq ( p , a ) ) , b );
if (res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
return NULL;
}
goto done;
}
p->mark = mark;
}
{ // '*' expression
expr_ty a;
Token * literal;
if (
(literal = _PyPegen_expect_token(p, 16))
&&
(a = expression_rule(p))
)
{
res = _PyPegen_singleton_seq ( p , a );
if (res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
return NULL;
}
goto done;
}
p->mark = mark;
}
{ // '**' expression
expr_ty a;
Token * literal;
if (
(literal = _PyPegen_expect_token(p, 35))
&&
(a = expression_rule(p))
)
{
res = _PyPegen_singleton_seq ( p , a );
if (res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
return NULL;
}
goto done;
}
p->mark = mark;
}
{ // ','.expression+
asdl_seq * _gather_9_var;
if (
Expand Down