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bpo-43822: Improve syntax errors for missing commas (GH-25377)

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Pablo Galindo 2021-04-15 21:38:45 +01:00 • committed by GitHub
parent e692f55979
commit b280248be8
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13 changed files with 1235 additions and 1034 deletions
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@ -7,6 +7,7 @@ _PyPegen_parse(Parser *p)
// Initialize keywords
p->keywords = reserved_keywords;
p->n_keyword_lists = n_keyword_lists;
p->soft_keywords = soft_keywords;
// Run parser
void *result = NULL;
@ -459,6 +460,7 @@ expressions[expr_ty]:
| a=expression ',' { _PyAST_Tuple(CHECK(asdl_expr_seq*, _PyPegen_singleton_seq(p, a)), Load, EXTRA) }
| expression
expression[expr_ty] (memo):
| invalid_expression
| a=disjunction 'if' b=disjunction 'else' c=expression { _PyAST_IfExp(b, a, c, EXTRA) }
| disjunction
| lambdef
@ -778,6 +780,13 @@ invalid_kwarg:
| expression a='=' {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
a, "expression cannot contain assignment, perhaps you meant \"==\"?") }
invalid_expression:
# !(NAME STRING) is not matched so we don't show this error with some invalid string prefixes like: kf"dsfsdf"
# Soft keywords need to also be ignored because they can be parsed as NAME NAME
| !(NAME STRING | SOFT_KEYWORD) a=disjunction expression {
RAISE_ERROR_KNOWN_LOCATION(p, PyExc_SyntaxError, a->lineno, a->end_col_offset - 1, "invalid syntax. Perhaps you forgot a comma?") }
invalid_named_expression:
| a=expression ':=' expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(