Add patch for Python 3.12 compatibility (PEP 701 f-strings)

Resolves: RHBZ#2225718

1027.patch

@@ -0,0 +1,89 @@
+From be26d03a477a8c7a3919e2ba00121a0f7954bdb5 Mon Sep 17 00:00:00 2001
+From: Petr Viktorin <encukou@gmail.com>
+Date: Thu, 21 Sep 2023 12:45:32 +0200
+Subject: [PATCH] Add F f-string parsing for Python 3.12 (PEP 701)
+
+Since Python 3.12, f-strings are tokenized and parsed like the rest
+of Python's grammar, using the new tokens FSTRING_START, FSTRING_MIDDLE
+and FSTRING_END.
+
+Make the babel message extractor concatenate these three if they're
+adjacent to each other. If they're not, that means there are dynamic
+substitutions, so the f-string is ignored.
+---
+ babel/messages/extract.py | 34 ++++++++++++++++++++++++++++++++++
+ 1 file changed, 34 insertions(+)
+
+diff --git a/babel/messages/extract.py b/babel/messages/extract.py
+index b6dce6fd..5b67d2b7 100644
+--- a/babel/messages/extract.py
++++ b/babel/messages/extract.py
+@@ -33,6 +33,7 @@
+ from textwrap import dedent
+ from tokenize import COMMENT, NAME, OP, STRING, generate_tokens
+ from typing import TYPE_CHECKING, Any
++import tokenize
+ 
+ from babel.util import parse_encoding, parse_future_flags, pathmatch
+ 
+@@ -89,6 +90,11 @@ def tell(self) -> int: ...
+ 
+ DEFAULT_MAPPING: list[tuple[str, str]] = [('**.py', 'python')]
+ 
++# New tokens in Python 3.12, or None on older versions
++FSTRING_START = getattr(tokenize, "FSTRING_START", None)
++FSTRING_MIDDLE = getattr(tokenize, "FSTRING_MIDDLE", None)
++FSTRING_END = getattr(tokenize, "FSTRING_END", None)
++
+ 
+ def _strip_comment_tags(comments: MutableSequence[str], tags: Iterable[str]):
+     """Helper function for `extract` that strips comment tags from strings
+@@ -497,6 +503,11 @@ def extract_python(
+     next_line = lambda: fileobj.readline().decode(encoding)
+ 
+     tokens = generate_tokens(next_line)
++
++    # Current prefix of a Python 3.12 (PEP 701) f-string, or None if we're not
++    # currently parsing one.
++    current_fstring_start = None
++
+     for tok, value, (lineno, _), _, _ in tokens:
+         if call_stack == -1 and tok == NAME and value in ('def', 'class'):
+             in_def = True
+@@ -558,6 +569,20 @@ def extract_python(
+                 val = _parse_python_string(value, encoding, future_flags)
+                 if val is not None:
+                     buf.append(val)
++
++            # Python 3.12+, see https://peps.python.org/pep-0701/#new-tokens
++            elif tok == FSTRING_START:
++                current_fstring_start = value
++            elif tok == FSTRING_MIDDLE:
++                if current_fstring_start is not None:
++                    current_fstring_start += value
++            elif tok == FSTRING_END:
++                if current_fstring_start is not None:
++                    fstring = current_fstring_start + value
++                    val = _parse_python_string(fstring, encoding, future_flags)
++                    if val is not None:
++                        buf.append(val)
++
+             elif tok == OP and value == ',':
+                 if buf:
+                     messages.append(''.join(buf))
+@@ -578,6 +603,15 @@ def extract_python(
+         elif tok == NAME and value in keywords:
+             funcname = value
+ 
++        if (current_fstring_start is not None
++            and tok not in {FSTRING_START, FSTRING_MIDDLE}
++        ):
++            # In Python 3.12, tokens other than FSTRING_* mean the
++            # f-string is dynamic, so we don't wan't to extract it.
++            # And if it's FSTRING_END, we've already handled it above.
++            # Let's forget that we're in an f-string.
++            current_fstring_start = None
++
+ 
+ def _parse_python_string(value: str, encoding: str, future_flags: int) -> str | None:
+     # Unwrap quotes in a safe manner, maintaining the string's encoding

babel.spec

@@ -28,6 +28,9 @@ Source:         %{pypi_source Babel}
 # 2 doctests are still deselected (as doctests are not part of this fix)
 Patch:          https://github.com/python-babel/babel/pull/998.patch
 
+# New code for extracting f-strings for Pytohn 3.12 (PEP 701)
+Patch:          https://github.com/python-babel/babel/pull/1027.patch
+
 BuildArch:      noarch
 
 BuildRequires:  python3-devel