8000 [3.10] Add more tests for group names and refs in RE (GH-91695) by miss-islington · Pull Request #91698 · python/cpython · GitHub
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[3.10] Add more tests 8000 for group names and refs in RE (GH-91695) #91698

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merged 1 commit into from
Apr 19, 2022
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[3.10] Add more tests for group names and refs in RE (GH-91695) #91698

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56 changes: 41 additions & 15 deletions Lib/test/test_re.py
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Original file line number Diff line number Diff line change
Expand Up @@ -218,6 +218,16 @@ def test_symbolic_groups(self):
re.compile(r'(?P<a>x)(?P=a)(?(a)y)')
re.compile(r'(?P<a1>x)(?P=a1)(?(a1)y)')
re.compile(r'(?P<a1>x)\1(?(1)y)')
re.compile(b'(?P<a1>x)(?P=a1)(?(a1)y)')
# New valid identifiers in Python 3
re.compile('(?P<µ>x)(?P=µ)(?(µ)y)')
re.compile('(?P<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>x)(?P=𝔘𝔫𝔦𝔠𝔬𝔡𝔢)(?(𝔘𝔫𝔦𝔠𝔬𝔡𝔢)y)')
# Support > 100 groups.
pat = '|'.join('x(?P<a%d>%x)y' % (i, i) for i in range(1, 200 + 1))
pat = '(?:%s)(?(200)z|t)' % pat
self.assertEqual(re.match(pat, 'xc8yz').span(), (0, 5))

def test_symbolic_groups_errors(self):
self.checkPatternError(r'(?P<a>)(?P<a>)',
"redefinition of group name 'a' as group 2; "
"was group 1")
Expand All @@ -243,16 +253,22 @@ def test_symbolic_groups(self):
self.checkPatternError(r'(?(-1))', "bad character in group name '-1'", 3)
self.checkPatternError(r'(?(1a))', "bad character in group name '1a'", 3)
self.checkPatternError(r'(?(a.))', "bad character in group name 'a.'", 3)
# New valid/invalid identifiers in Python 3
re.compile('(?P<µ>x)(?P=µ)(?(µ)y)')
re.compile('(?P<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>x)(?P=𝔘𝔫𝔦𝔠𝔬𝔡𝔢)(?(𝔘𝔫𝔦𝔠𝔬𝔡𝔢)y)')
self.checkPatternError('(?P<©>x)', "bad character in group name '©'", 4)
self.checkPatternError('(?P=©)', "bad character in group name '©'", 4)
self.checkPatternError('(?(©)y)', "bad character in group name '©'", 3)

def test_symbolic_refs(self):
self.assertEqual(re.sub('(?P<a>x)|(?P<b>y)', r'\g<b>', 'xx'), '')
self.assertEqual(re.sub('(?P<a>x)|(?P<b>y)', r'\2', 'xx'), '')
self.assertEqual(re.sub(b'(?P<a1>x)', br'\g<a1>', b'xx'), b'xx')
# New valid identifiers in Python 3
self.assertEqual(re.sub('(?P<µ>x)', r'\g<µ>', 'xx'), 'xx')
self.assertEqual(re.sub('(?P<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>x)', r'\g<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>', 'xx'), 'xx')
# Support > 100 groups.
pat = '|'.join('x(?P<a%d>%x)y' % (i, i) for i in range(1, 200 + 1))
pat = '(?:%s)(?(200)z|t)' % pat
self.assertEqual(re.match(pat, 'xc8yz').span(), (0, 5))
self.assertEqual(re.sub(pat, r'\g<200>', 'xc8yzxc8y'), 'c8zc8')

def test_symbolic_refs(self):
def test_symbolic_refs_errors(self):
self.checkTemplateError('(?P<a>x)', r'\g<a', 'xx',
'missing >, unterminated name', 3)
self.checkTemplateError('(?P<a>x)', r'\g<', 'xx',
Expand All @@ -270,18 +286,14 @@ def test_symbolic_refs(self):
'invalid group reference 2', 1)
with self.assertRaisesRegex(IndexError, "unknown group name 'ab'"):
re.sub('(?P<a>x)', r'\g<ab>', 'xx')
self.assertEqual(re.sub('(?P<a>x)|(?P<b>y)', r'\g<b>', 'xx'), '')
self.assertEqual(re.sub('(?P<a>x)|(?P<b>y)', r'\2', 'xx'), '')
self.checkTemplateError('(?P<a>x)', r'\g<-1>', 'xx',
"bad character in group name '-1'", 3)
# New valid/invalid identifiers in Python 3
self.assertEqual(re.sub('(?P<µ>x)', r'\g<µ>', 'xx'), 'xx')
self.assertEqual(re.sub('(?P<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>x)', r'\g<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>', 'xx'), 'xx')
self.checkTemplateError('(?P<a>x)', r'\g<©>', 'xx',
"bad character in group name '©'", 3)
# Support > 100 groups.
pat = '|'.join('x(?P<a%d>%x)y' % (i, i) for i in range(1, 200 + 1))
self.assertEqual(re.sub(pat, r'\g<200>', 'xc8yzxc8y'), 'c8zc8')
self.checkTemplateError('(?P<a>x)', r'\g<㊀>', 'xx',
"bad character in group name '㊀'", 3)
self.checkTemplateError('(?P<a>x)', r'\g<¹>', 'xx',
"bad character in group name '¹'", 3)

def test_re_subn(self):
self.assertEqual(re.subn("(?i)b+", "x", "bbbb BBBB"), ('x x', 2))
Expand Down Expand Up @@ -543,9 +555,23 @@ def test_re_groupref_exists(self):
pat = '(?:%s)(?(200)z)' % pat
self.assertEqual(re.match(pat, 'xc8yz').span(), (0, 5))

self.checkPatternError(r'(?P<a>)(?(0))', 'bad group number', 10)
def test_re_groupref_exists_errors(self):
self.checkPatternError(r'(?P<a>)(?(0)a|b)', 'bad group number', 10)
self.checkPatternError(r'()(?(-1)a|b)',
"bad character in group name '-1'", 5)
self.checkPatternError(r'()(?(㊀)a|b)',
"bad character in group name '㊀'", 5)
self.checkPatternError(r'()(?(¹)a|b)',
"bad character in group name '¹'", 5)
self.checkPatternError(r'()(?(1',
"missing ), unterminated name", 5)
self.checkPatternError(r'()(?(1)a',
"missing ), unterminated subpattern", 2)
self.checkPatternError(r'()(?(1)a|b',
'missing ), unterminated subpattern', 2)
self.checkPatternError(r'()(?(1)a|b|c',
'conditional backref with more than '
'two branches', 10)
self.checkPatternError(r'()(?(1)a|b|c)',
'conditional backref with more than '
'two branches', 10)
Expand Down
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