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bpo-47212: Improve error messages for un-parenthesized generator expressions (GH-32302)

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Matthieu Dartiailh 2022-04-05 15:47:13 +02:00 committed by GitHub
parent f1606a5ba5
commit aa0f056a00
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 28 additions and 8 deletions
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6
Grammar/python.gram
View file

@ -1073,12 +1073,12 @@ func_type_comment[Token*]:
invalid_arguments:
| a=args ',' '*' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "iterable argument unpacking follows keyword argument unpacking") }
| a=expression b=for_if_clauses ',' [args | expression for_if_clauses] {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, PyPegen_last_item(b, comprehension_ty)->target, "Generator expression must be parenthesized") }
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, _PyPegen_get_last_comprehension_item(PyPegen_last_item(b, comprehension_ty)), "Generator expression must be parenthesized") }
| a=NAME b='=' expression for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Maybe you meant '==' or ':=' instead of '='?")}
| a=args b=for_if_clauses { _PyPegen_nonparen_genexp_in_call(p, a, b) }
| args ',' a=expression b=for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, asdl_seq_GET(b, b->size-1)->target, "Generator expression must be parenthesized") }
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, _PyPegen_get_last_comprehension_item(PyPegen_last_item(b, comprehension_ty)), "Generator expression must be parenthesized") }
| a=args ',' args { _PyPegen_arguments_parsing_error(p, a) }
invalid_kwarg:
| a[Token*]=('True'|'False'|'None') b='=' {
@ -1257,7 +1257,7 @@ invalid_finally_stmt:
invalid_except_stmt_indent:
| a='except' expression ['as' NAME ] ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'except' statement on line %d", a->lineno) }
| a='except' ':' NEWLINE !INDENT { RAISE_SYNTAX_ERROR("expected an indented block after except statement on line %d", a->lineno) }
| a='except' ':' NEWLINE !INDENT { RAISE_INDENTATION_ERROR("expected an indented block after 'except' statement on line %d", a->lineno) }
invalid_except_star_stmt_indent:
| a='except' '*' expression ['as' NAME ] ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'except*' statement on line %d", a->lineno) }

11
Lib/test/test_exceptions.py
View file

@ -198,12 +198,17 @@ def ckmsg(src, msg, exception=SyntaxError):
s = '''if True:\n print()\n\texec "mixed tabs and spaces"'''
ckmsg(s, "inconsistent use of tabs and spaces in indentation", TabError)
def check(self, src, lineno, offset, encoding='utf-8'):
def check(self, src, lineno, offset, end_lineno=None, end_offset=None, encoding='utf-8'):
with self.subTest(source=src, lineno=lineno, offset=offset):
with self.assertRaises(SyntaxError) as cm:
compile(src, '<fragment>', 'exec')
self.assertEqual(cm.exception.lineno, lineno)
self.assertEqual(cm.exception.offset, offset)
if end_lineno is not None:
self.assertEqual(cm.exception.end_lineno, end_lineno)
if end_offset is not None:
self.assertEqual(cm.exception.end_offset, end_offset)
if cm.exception.text is not None:
if not isinstance(src, str):
src = src.decode(encoding, 'replace')
@ -235,6 +240,10 @@ def testSyntaxErrorOffset(self):
check('match ...:\n case {**rest, "key": value}:\n ...', 2, 19)
check("[a b c d e f]", 1, 2)
check("for x yfff:", 1, 7)
check("f(a for a in b, c)", 1, 3, 1, 15)
check("f(a for a in b if a, c)", 1, 3, 1, 20)
check("f(a, b for b in c)", 1, 6, 1, 18)
check("f(a, b for b in c, d)", 1, 6, 1, 18)
# Errors thrown by compile.c
check('class foo:return 1', 1, 11)

7
Lib/test/test_syntax.py
View file

@ -1307,6 +1307,13 @@
Traceback (most recent call last):
IndentationError: expected an indented block after 'try' statement on line 1
>>> try:
... something()
... except:
... pass
Traceback (most recent call last):
IndentationError: expected an indented block after 'except' statement on line 3
>>> try:
... something()
... except A:

3
Misc/NEWS.d/next/Core and Builtins/2022-04-05-11-29-21.bpo-47212.leF4pz.rst Normal file
View file

@ -0,0 +1,3 @@
Raise :exc:`IndentationError` instead of :exc:`SyntaxError` for a bare
``except`` with no following indent. Improve :exc:`SyntaxError` locations for
an un-parenthesized generator used as arguments. Patch by Matthieu Dartiailh.

2
Parser/action_helpers.c
View file

@ -1145,7 +1145,7 @@ _PyPegen_get_expr_name(expr_ty e)
}
}
static inline expr_ty
expr_ty
_PyPegen_get_last_comprehension_item(comprehension_ty comprehension) {
if (comprehension->ifs == NULL || asdl_seq_LEN(comprehension->ifs) == 0) {
return comprehension->iter;

6
Parser/parser.c generated
View file

@ -18968,7 +18968,7 @@ invalid_arguments_rule(Parser *p)
)
{
D(fprintf(stderr, "%*c+ invalid_arguments[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "expression for_if_clauses ',' [args | expression for_if_clauses]"));
_res = RAISE_SYNTAX_ERROR_KNOWN_RANGE ( a , PyPegen_last_item ( b , comprehension_ty ) -> target , "Generator expression must be parenthesized" );
_res = RAISE_SYNTAX_ERROR_KNOWN_RANGE ( a , _PyPegen_get_last_comprehension_item ( PyPegen_last_item ( b , comprehension_ty ) ) , "Generator expression must be parenthesized" );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
p->level--;
@ -19061,7 +19061,7 @@ invalid_arguments_rule(Parser *p)
)
{
D(fprintf(stderr, "%*c+ invalid_arguments[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "args ',' expression for_if_clauses"));
_res = RAISE_SYNTAX_ERROR_KNOWN_RANGE ( a , asdl_seq_GET ( b , b -> size - 1 ) -> target , "Generator expression must be parenthesized" );
_res = RAISE_SYNTAX_ERROR_KNOWN_RANGE ( a , _PyPegen_get_last_comprehension_item ( PyPegen_last_item ( b , comprehension_ty ) ) , "Generator expression must be parenthesized" );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
p->level--;
@ -22190,7 +22190,7 @@ invalid_except_stmt_indent_rule(Parser *p)
)
{
D(fprintf(stderr, "%*c+ invalid_except_stmt_indent[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'except' ':' NEWLINE !INDENT"));
_res = RAISE_SYNTAX_ERROR ( "expected an indented block after except statement on line %d" , a -> lineno );
_res = RAISE_INDENTATION_ERROR ( "expected an indented block after 'except' statement on line %d" , a -> lineno );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
p->level--;

1
Parser/pegen.h
View file

@ -324,6 +324,7 @@ int _PyPegen_check_barry_as_flufl(Parser *, Token *);
int _PyPegen_check_legacy_stmt(Parser *p, expr_ty t);
mod_ty _PyPegen_make_module(Parser *, asdl_stmt_seq *);
void *_PyPegen_arguments_parsing_error(Parser *, expr_ty);
expr_ty _PyPegen_get_last_comprehension_item(comprehension_ty comprehension);
void *_PyPegen_nonparen_genexp_in_call(Parser *p, expr_ty args, asdl_comprehension_seq *comprehensions);
// Parser API