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GH-103718: Correctly cache and restore f-string buffers when needed#103719

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5 changes: 5 additions & 0 deletionsLib/test/test_fstring.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1532,5 +1532,10 @@ def test_syntax_error_for_starred_expressions(self):
"f-string: expecting a valid expression after '{'"):
compile("f'{**a}'", "?", "exec")

def test_not_closing_quotes(self):
self.assertAllRaise(SyntaxError, "unterminated f-string literal", ['f"', "f'"])
self.assertAllRaise(SyntaxError, "unterminated triple-quoted f-string literal",
['f"""', "f'''"])

if __name__ == '__main__':
unittest.main()
38 changes: 27 additions & 11 deletionsParser/tokenizer.c
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Expand Up@@ -361,21 +361,35 @@ tok_concatenate_interactive_new_line(struct tok_state *tok, const char *line) {
return 0;
}


/* Traverse and update all f-string buffers with the value */
/* Traverse and remember all f-string buffers, in order to be able to restore
them after reallocating tok->buf */
static void
update_fstring_buffers(struct tok_state *tok, char value, int regular, int multiline)
remember_fstring_buffers(struct tok_state *tok)
{
int index;
tokenizer_mode *mode;

for (index = tok->tok_mode_stack_index; index >= 0; --index) {
mode = &(tok->tok_mode_stack[index]);
if (regular && mode->f_string_start != NULL) {
mode->f_string_start += value;
if (mode->kind == TOK_FSTRING_MODE) {
mode->f_string_start_offset = mode->f_string_start - tok->buf;
mode->f_string_multi_line_start_offset = mode->f_string_multi_line_start - tok->buf;
}
if (multiline && mode->f_string_multi_line_start != NULL) {
mode->f_string_multi_line_start += value;
}
}

/* Traverse and restore all f-string buffers after reallocating tok->buf */
static void
restore_fstring_buffers(struct tok_state *tok)
{
int index;
tokenizer_mode *mode;

for (index = tok->tok_mode_stack_index; index >= 0; --index) {
mode = &(tok->tok_mode_stack[index]);
if (mode->kind == TOK_FSTRING_MODE) {
mode->f_string_start = tok->buf + mode->f_string_start_offset;
mode->f_string_multi_line_start = tok->buf + mode->f_string_multi_line_start_offset;
}
}
}
Expand DownExpand Up@@ -476,7 +490,7 @@ tok_reserve_buf(struct tok_state *tok, Py_ssize_t size)
Py_ssize_t start = tok->start == NULL ? -1 : tok->start - tok->buf;
Py_ssize_t line_start = tok->start == NULL ? -1 : tok->line_start - tok->buf;
Py_ssize_t multi_line_start = tok->multi_line_start - tok->buf;
update_fstring_buffers(tok, -*tok->buf, /*regular=*/1, /*multiline=*/1);
remember_fstring_buffers(tok);
newbuf = (char *)PyMem_Realloc(newbuf, newsize);
if (newbuf == NULL) {
tok->done = E_NOMEM;
Expand All@@ -489,7 +503,7 @@ tok_reserve_buf(struct tok_state *tok, Py_ssize_t size)
tok->start = start < 0 ? NULL : tok->buf + start;
tok->line_start = line_start < 0 ? NULL : tok->buf + line_start;
tok->multi_line_start = multi_line_start < 0 ? NULL : tok->buf + multi_line_start;
update_fstring_buffers(tok, *tok->buf, /*regular=*/1, /*multiline=*/1);
restore_fstring_buffers(tok);
}
return 1;
}
Expand DownExpand Up@@ -1051,7 +1065,7 @@ tok_underflow_interactive(struct tok_state *tok) {
}
else if (tok->start != NULL) {
Py_ssize_t cur_multi_line_start = tok->multi_line_start - tok->buf;
update_fstring_buffers(tok, -*tok->buf, /*regular=*/0, /*multiline=*/1);
remember_fstring_buffers(tok);
size_t size = strlen(newtok);
ADVANCE_LINENO();
if (!tok_reserve_buf(tok, size + 1)) {
Expand All@@ -1064,7 +1078,7 @@ tok_underflow_interactive(struct tok_state *tok) {
PyMem_Free(newtok);
tok->inp += size;
tok->multi_line_start = tok->buf + cur_multi_line_start;
update_fstring_buffers(tok, *tok->buf, /*regular=*/0, /*multiline=*/1);
restore_fstring_buffers(tok);
}
else {
ADVANCE_LINENO();
Expand DownExpand Up@@ -2207,6 +2221,8 @@ tok_get_normal_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct t
the_current_tok->f_string_quote_size = quote_size;
the_current_tok->f_string_start = tok->start;
the_current_tok->f_string_multi_line_start = tok->line_start;
the_current_tok->f_string_start_offset = -1;
the_current_tok->f_string_multi_line_start_offset = -1;
the_current_tok->last_expr_buffer = NULL;
the_current_tok->last_expr_size = 0;
the_current_tok->last_expr_end = -1;
Expand Down
3 changes: 3 additions & 0 deletionsParser/tokenizer.h
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Expand Up@@ -52,6 +52,9 @@ typedef struct _tokenizer_mode {
const char* f_string_start;
const char* f_string_multi_line_start;

Py_ssize_t f_string_start_offset;
Py_ssize_t f_string_multi_line_start_offset;

Py_ssize_t last_expr_size;
Py_ssize_t last_expr_end;
char* last_expr_buffer;
Expand Down
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