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[3.13] gh-122026: Fix identification of mismatched parentheses inside f-strings (GH-122028) (#122041)

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Miss Islington (bot) 2024-07-19 19:32:34 +02:00 • committed by GitHub
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1
Lib/test/test_fstring.py
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@ -897,6 +897,7 @@ x = (
"f'{:2}'",
"f'''{\t\f\r\n:a}'''",
"f'{:'",
"F'{[F'{:'}[F'{:'}]]]",
])
self.assertAllRaise(SyntaxError,

2
Misc/NEWS.d/next/Core and Builtins/2024-07-19-15-28-05.gh-issue-122026.sta2Ca.rst Normal file
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@ -0,0 +1,2 @@
Fix a bug that caused the tokenizer to not correctly identify mismatched
parentheses inside f-strings in some situations. Patch by Pablo Galindo

3
Parser/lexer/lexer.c
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@ -1238,6 +1238,9 @@ tok_get_normal_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct t
if (INSIDE_FSTRING(tok)) {
current_tok->curly_bracket_depth--;
if (current_tok->curly_bracket_depth < 0) {
return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "f-string: unmatched '%c'", c));
}
if (c == '}' && current_tok->curly_bracket_depth == current_tok->curly_bracket_expr_start_depth) {
current_tok->curly_bracket_expr_start_depth--;
current_tok->kind = TOK_FSTRING_MODE;