gh-83035: handle decorator with nested parens in inspect.getsource (GH-99654)

(cherry picked from commit 68e4129)

Co-authored-by: Carl Meyer <carl@oddbird.net>

Author: miss-islington

Lib/inspect.py

@@ -1052,7 +1052,6 @@ def __init__(self):
         self.started = False
         self.passline = False
         self.indecorator = False
-        self.decoratorhasargs = False
         self.last = 1
         self.body_col0 = None
 
@@ -1067,21 +1066,14 @@ def tokeneater(self, type, token, srowcol, erowcol, line):
                     self.islambda = True
                 self.started = True
             self.passline = True    # skip to the end of the line
-        elif token == "(":
-            if self.indecorator:
-                self.decoratorhasargs = True
-        elif token == ")":
-            if self.indecorator:
-                self.indecorator = False
-                self.decoratorhasargs = False
         elif type == tokenize.NEWLINE:
             self.passline = False   # stop skipping when a NEWLINE is seen
             self.last = srowcol[0]
             if self.islambda:       # lambdas always end at the first NEWLINE
                 raise EndOfBlock
             # hitting a NEWLINE when in a decorator without args
             # ends the decorator
-            if self.indecorator and not self.decoratorhasargs:
+            if self.indecorator:
                 self.indecorator = False
         elif self.passline:
             pass

Lib/test/inspect_fodder2.py

@@ -259,3 +259,17 @@ def all_markers_with_args_and_kwargs(a, b, /, c, d, *args, e, f, **kwargs):
 #line 259
 def all_markers_with_defaults(a, b=1, /, c=2, d=3, *, e=4, f=5):
     pass
+
+# line 263
+def deco_factory(**kwargs):
+    def deco(f):
+        @wraps(f)
+        def wrapper(*a, **kwd):
+            kwd.update(kwargs)
+            return f(*a, **kwd)
+        return wrapper
+    return deco
+
+@deco_factory(foo=(1 + 2), bar=lambda: 1)
+def complex_decorated(foo=0, bar=lambda: 0):
+    return foo + bar()

Lib/test/test_inspect.py

@@ -825,6 +825,12 @@ def test_class(self):
         self.assertSourceEqual(self.fodderModule.X, 1, 2)
 
 
+class TestComplexDecorator(GetSourceBase):
+    fodderModule = mod2
+
+    def test_parens_in_decorator(self):
+        self.assertSourceEqual(self.fodderModule.complex_decorated, 273, 275)
+
 class _BrokenDataDescriptor(object):
     """
     A broken data descriptor. See bug #1785.

Misc/NEWS.d/next/Library/2022-11-21-16-24-01.gh-issue-83035.qZIujU.rst

@@ -0,0 +1 @@
+Fix :func:`inspect.getsource` handling of decorator calls with nested parentheses.