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gh-132661: Disallow Template/str concatenation after PEP 750 spec update (#135996)

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Co-authored-by: sobolevn <mail@sobolevn.me>
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
This commit is contained in:
Dave Peck 2025-07-20 23:44:26 -07:00 • committed by GitHub
parent 246be21de1
commit c5e77af131
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GPG key ID: B5690EEEBB952194
13 changed files with 2097 additions and 2133 deletions
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86
Python/ast_unparse.c
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@ -663,27 +663,15 @@ build_ftstring_body(asdl_expr_seq *values, bool is_format_spec)
}
static int
_write_values_subarray(PyUnicodeWriter *writer, asdl_expr_seq *values, Py_ssize_t first_idx,
Py_ssize_t last_idx, char prefix, PyArena *arena)
append_templatestr(PyUnicodeWriter *writer, expr_ty e)
{
int result = -1;
asdl_expr_seq *new_values = _Py_asdl_expr_seq_new(last_idx - first_idx + 1, arena);
if (!new_values) {
return result;
}
Py_ssize_t j = 0;
for (Py_ssize_t i = first_idx; i <= last_idx; ++i) {
asdl_seq_SET(new_values, j++, asdl_seq_GET(values, i));
}
PyObject *body = build_ftstring_body(new_values, false);
PyObject *body = build_ftstring_body(e->v.TemplateStr.values, false);
if (!body) {
return result;
return -1;
}
if (-1 != append_char(writer, prefix) &&
if (-1 != append_charp(writer, "t") &&
-1 != append_repr(writer, body))
{
result = 0;
@ -692,72 +680,6 @@ _write_values_subarray(PyUnicodeWriter *writer, asdl_expr_seq *values, Py_ssize_
return result;
}
static int
append_templatestr(PyUnicodeWriter *writer, expr_ty e)
{
PyArena *arena = _PyArena_New();
if (!arena) {
return -1;
}
Py_ssize_t last_idx = 0;
Py_ssize_t len = asdl_seq_LEN(e->v.TemplateStr.values);
if (len == 0) {
int result = _write_values_subarray(writer, e->v.TemplateStr.values,
0, len - 1, 't', arena);
_PyArena_Free(arena);
return result;
}
for (Py_ssize_t i = 0; i < len; i++) {
expr_ty value = asdl_seq_GET(e->v.TemplateStr.values, i);
// Handle implicit concat of t-strings with f-strings
if (value->kind == FormattedValue_kind) {
if (i > last_idx) {
// Create a new TemplateStr with the values between last_idx and i
// and append it to the writer.
if (_write_values_subarray(writer, e->v.TemplateStr.values,
last_idx, i - 1, 't', arena) == -1) {
goto error;
}
if (append_charp(writer, " ") == -1) {
goto error;
}
}
// Append the FormattedValue to the writer.
if (_write_values_subarray(writer, e->v.TemplateStr.values,
i, i, 'f', arena) == -1) {
goto error;
}
if (i + 1 < len) {
if (append_charp(writer, " ") == -1) {
goto error;
}
}
last_idx = i + 1;
}
}
if (last_idx < len) {
if (_write_values_subarray(writer, e->v.TemplateStr.values,
last_idx, len - 1, 't', arena) == -1) {
goto error;
}
}
_PyArena_Free(arena);
return 0;
error:
_PyArena_Free(arena);
return -1;
}
static int
append_joinedstr(PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
{