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[3.12] gh-106510: Fix DEBUG output for atomic group (GH-106511) #106548

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Jul 8, 2023
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[3.12] gh-106510: Fix DEBUG output for atomic group (GH-106511) #106548

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4 changes: 3 additions & 1 deletion Lib/re/_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,6 @@ def __init__(self, state, data=None):
self.width = None

def dump(self, level=0):
nl = True
seqtypes = (tuple, list)
for op, av in self.data:
print(level*" " + str(op), end='')
Expand All @@ -136,6 +135,9 @@ def dump(self, level=0):
if item_no:
print(level*" " + "ELSE")
item_no.dump(level+1)
elif isinstance(av, SubPattern):
print()
av.dump(level+1)
elif isinstance(av, seqtypes):
nl = False
for a in av:
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5 changes: 4 additions & 1 deletion Lib/test/test_re.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2512,7 +2512,10 @@ def test_debug_flag(self):

def test_atomic_group(self):
self.assertEqual(get_debug_out(r'(?>ab?)'), '''\
ATOMIC_GROUP [(LITERAL, 97), (MAX_REPEAT, (0, 1, [(LITERAL, 98)]))]
ATOMIC_GROUP
LITERAL 97
MAX_REPEAT 0 1
LITERAL 98

0. INFO 4 0b0 1 2 (to 5)
5: ATOMIC_GROUP 11 (to 17)
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst
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@@ -0,0 +1 @@
Improve debug output for atomic groups in regular expressions.