mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-07-23 11:15:24 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 11

bpo-46707: Avoid potential exponential backtracking in some syntax errors (GH-31241)

Browse source
This commit is contained in:
Pablo Galindo Salgado 2022-02-10 03:37:17 +00:00 • committed by GitHub
parent cb68788dca
commit b71dc71905
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 1561 additions and 1544 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Grammar/python.gram
View file

@ -1095,13 +1095,15 @@ invalid_expression:
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Perhaps you forgot a comma?") }
| a=disjunction 'if' b=disjunction !('else'|':') { RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "expected 'else' after 'if' expression") }
invalid_left_assignment_prefixes(memo): list|tuple|genexp|'True'|'None'|'False'
invalid_named_expression:
| a=expression ':=' expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
a, "cannot use assignment expressions with %s", _PyPegen_get_expr_name(a)) }
| a=NAME '=' b=bitwise_or !('='|':=') {
p->in_raw_rule ? NULL : RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Maybe you meant '==' or ':=' instead of '='?") }
| !(list|tuple|genexp|'True'|'None'|'False') a=bitwise_or b='=' bitwise_or !('='|':=') {
| !invalid_left_assignment_prefixes a=bitwise_or b='=' bitwise_or !('='|':=') {
p->in_raw_rule ? NULL : RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot assign to %s here. Maybe you meant '==' instead of '='?",
_PyPegen_get_expr_name(a)) }