Fix grouping of `case` within parenthesis.

Closes #164

2 files changed, 9 insertions, 0 deletions

diff --git a/sqlparse/engine/grouping.py b/sqlparse/engine/grouping.py
index e8e9dc3..91bb3d9 100644
--- a/sqlparse/engine/grouping.py
+++ b/sqlparse/engine/grouping.py
@@ -42,6 +42,8 @@ def _group_left_right(tlist, m, cls,
 
 def _group_matching(tlist, cls):
     """Groups Tokens that have beginning and end."""
+    [_group_matching(sgroup, cls) for sgroup in tlist.get_sublists()
+     if not isinstance(sgroup, cls)]
     idx = 1 if isinstance(tlist, cls) else 0
 
     token = tlist.token_next_by(m=cls.M_OPEN, idx=idx)
diff --git a/tests/test_regressions.py b/tests/test_regressions.py
index 9f3c9a9..4eb1621 100644
--- a/tests/test_regressions.py
+++ b/tests/test_regressions.py
@@ -311,3 +311,10 @@ def test_issue207_runaway_format():
                            "          2 as two,",
                            "          3",
                            "   from dual) t0"])
+
+
+def test_case_within_parenthesis():
+    # see issue #164
+    s = '(case when 1=1 then 2 else 5 end)'
+    p = sqlparse.parse(s)[0]
+    assert isinstance(p[0][1], sql.Case)