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gh-112243: Don't include comments in f-string debug expressions (#112284)

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Pablo Galindo Salgado 2023-11-20 15:18:24 +00:00 committed by GitHub
parent 3b3ec0d77f
commit d59feb5dbe
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3 changed files with 53 additions and 6 deletions
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3
Lib/test/test_fstring.py
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@ -1627,6 +1627,9 @@ def __repr__(self):
self.assertEqual(f'X{x = }Y', 'Xx = '+repr(x)+'Y')
self.assertEqual(f"sadsd {1 + 1 = :{1 + 1:1d}f}", "sadsd 1 + 1 = 2.000000")
self.assertEqual(f"{1+2 = # my comment
}", '1+2 = \n 3')
# These next lines contains tabs. Backslash escapes don't
# work in f-strings.
# patchcheck doesn't like these tabs. So the only way to test

1
Misc/NEWS.d/next/Core and Builtins/2023-11-20-14-13-02.gh-issue-112243.FKdQnr.rst Normal file
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@ -0,0 +1 @@
Don't include comments in f-string debug expressions. Patch by Pablo Galindo

45
Parser/lexer/lexer.c
View file

@ -116,12 +116,55 @@ set_fstring_expr(struct tok_state* tok, struct token *token, char c) {
if (!tok_mode->f_string_debug || token->metadata) {
return 0;
}
PyObject *res = NULL;
PyObject *res = PyUnicode_DecodeUTF8(
// Check if there is a # character in the expression
int hash_detected = 0;
for (Py_ssize_t i = 0; i < tok_mode->last_expr_size - tok_mode->last_expr_end; i++) {
if (tok_mode->last_expr_buffer[i] == '#') {
hash_detected = 1;
break;
}
}
if (hash_detected) {
Py_ssize_t input_length = tok_mode->last_expr_size - tok_mode->last_expr_end;
char *result = (char *)PyObject_Malloc((input_length + 1) * sizeof(char));
if (!result) {
return -1;
}
Py_ssize_t i = 0;
Py_ssize_t j = 0;
for (i = 0, j = 0; i < input_length; i++) {
if (tok_mode->last_expr_buffer[i] == '#') {
// Skip characters until newline or end of string
while (tok_mode->last_expr_buffer[i] != '\0' && i < input_length) {
if (tok_mode->last_expr_buffer[i] == '\n') {
result[j++] = tok_mode->last_expr_buffer[i];
break;
}
i++;
}
} else {
result[j++] = tok_mode->last_expr_buffer[i];
}
}
result[j] = '\0'; // Null-terminate the result string
res = PyUnicode_DecodeUTF8(result, j, NULL);
PyObject_Free(result);
} else {
res = PyUnicode_DecodeUTF8(
tok_mode->last_expr_buffer,
tok_mode->last_expr_size - tok_mode->last_expr_end,
NULL
);
}
if (!res) {
return -1;
}