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gh-98401: Invalid escape sequences emits SyntaxWarning (#99011)

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A backslash-character pair that is not a valid escape sequence now
generates a SyntaxWarning, instead of DeprecationWarning.  For
example, re.compile("\d+\.\d+") now emits a SyntaxWarning ("\d" is an
invalid escape sequence), use raw strings for regular expression:
re.compile(r"\d+\.\d+"). In a future Python version, SyntaxError will
eventually be raised, instead of SyntaxWarning.

Octal escapes with value larger than 0o377 (ex: "\477"), deprecated
in Python 3.11, now produce a SyntaxWarning, instead of
DeprecationWarning. In a future Python version they will be
eventually a SyntaxError.

codecs.escape_decode() and codecs.unicode_escape_decode() are left
unchanged: they still emit DeprecationWarning.

* The parser only emits SyntaxWarning for Python 3.12 (feature
  version), and still emits DeprecationWarning on older Python
  versions.
* Fix SyntaxWarning by using raw strings in Tools/c-analyzer/ and
  wasm_build.py.
This commit is contained in:
Victor Stinner 2022-11-03 17:53:25 +01:00 • committed by GitHub
parent 916af11a97
commit a60ddd31be
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 69 additions and 29 deletions
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11
Parser/string_parser.c
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@ -21,9 +21,16 @@ warn_invalid_escape_sequence(Parser *p, const char *first_invalid_escape, Token
if (msg == NULL) {
return -1;
}
if (PyErr_WarnExplicitObject(PyExc_DeprecationWarning, msg, p->tok->filename,
PyObject *category;
if (p->feature_version >= 12) {
category = PyExc_SyntaxWarning;
}
else {
category = PyExc_DeprecationWarning;
}
if (PyErr_WarnExplicitObject(category, msg, p->tok->filename,
t->lineno, NULL, NULL) < 0) {
if (PyErr_ExceptionMatches(PyExc_DeprecationWarning)) {
if (PyErr_ExceptionMatches(category)) {
/* Replace the DeprecationWarning exception with a SyntaxError
to get a more accurate error report */
PyErr_Clear();