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[3.14] gh-63161: Fix PEP 263 support (GH-139481) (GH-139898)

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* Support non-UTF-8 shebang and comments if non-UTF-8 encoding is specified.
* Detect decoding error in comments for UTF-8 encoding.
* Include the decoding error position for default encoding in SyntaxError.
(cherry picked from commit 5c942f11cd)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2025-10-19 21:16:33 +02:00 • committed by GitHub
parent 69d263cfe1
commit 9ff705c6c5
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9 changed files with 211 additions and 46 deletions
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8
Lib/test/test_exceptions.py
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@ -224,6 +224,8 @@ def check(self, src, lineno, offset, end_lineno=None, end_offset=None, encoding=
if not isinstance(src, str):
src = src.decode(encoding, 'replace')
line = src.split('\n')[lineno-1]
if lineno == 1:
line = line.removeprefix('\ufeff')
self.assertIn(line, cm.exception.text)
def test_error_offset_continuation_characters(self):
@ -239,7 +241,9 @@ def testSyntaxErrorOffset(self):
check('Python = "\u1e54\xfd\u0163\u0125\xf2\xf1" +', 1, 20)
check(b'# -*- coding: cp1251 -*-\nPython = "\xcf\xb3\xf2\xee\xed" +',
2, 19, encoding='cp1251')
check(b'Python = "\xcf\xb3\xf2\xee\xed" +', 1, 10)
check(b'Python = "\xcf\xb3\xf2\xee\xed" +', 1, 12)
check(b'\n\n\nPython = "\xcf\xb3\xf2\xee\xed" +', 4, 12)
check(b'\xef\xbb\xbfPython = "\xcf\xb3\xf2\xee\xed" +', 1, 12)
check('x = "a', 1, 5)
check('lambda x: x = 2', 1, 1)
check('f{a + b + c}', 1, 2)
@ -287,7 +291,7 @@ def baz():
check("pass\npass\npass\n(1+)\npass\npass\npass", 4, 4)
check("(1+)", 1, 4)
check("[interesting\nfoo()\n", 1, 1)
check(b"\xef\xbb\xbf#coding: utf8\nprint('\xe6\x88\x91')\n", 0, -1)
check(b"\xef\xbb\xbf#coding: utf8\nprint('\xe6\x88\x91')\n", 1, 0)
check("""f'''
{
(123_a)