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

(cherry picked from commit 74ec02e9490d8aa086aa9ad9d1d34d2ad999b5af)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

diff --git a/Lib/re/_parser.py b/Lib/re/_parser.py
index 5709acb6267238ef0d9332bfef9dfab50bf69ffa..74bda2f103083c5d4fb04066b20b087d2a8add12 100644 (file)
--- a/Lib/re/_parser.py
+++ b/Lib/re/_parser.py
@@ -114,7 +114,6 @@ class SubPattern:
         self.width = None
 
     def dump(self, level=0):
-        nl = True
         seqtypes = (tuple, list)
         for op, av in self.data:
             print(level*"  " + str(op), end='')
@@ -136,6 +135,9 @@ class SubPattern:
                 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:

diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index a05a1c99def0bc02d3781e60f04e335ed0a20de2..406b665c192df4a20c2793165ff41a012ccf2400 100644 (file)
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -2512,7 +2512,10 @@ ELSE
 
     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)

diff --git a/Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst b/Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst
new file mode 100644 (file)
index 0000000..e0646fa
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-07-07-13-47-28.gh-issue-106510.9n5BdC.rst
@@ -0,0 +1 @@
+Improve debug output for atomic groups in regular expressions.