Backport gh-83035: handle decorator with nested parens in inspect.get…

…source (#99654)

Summary: Backport the upstream fix from python/cpython#99654

Test Plan: existing tests

Reviewers: carljm, #cinder

Reviewed By: carljm

Differential Revision: https://phabricator.intern.facebook.com/D41824891

Lib/inspect.py

@@ -1052,7 +1052,6 @@ def __init__(self):
         self.started = False
         self.passline = False
         self.indecorator = False
-        self.decoratorparenlevel = 0
         self.last = 1
         self.body_col0 = None
 
@@ -1067,22 +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.decoratorparenlevel += 1
-        elif token == ")":
-            if self.indecorator:
-                self.decoratorparenlevel -= 1
-                if not self.decoratorparenlevel:
-                    self.indecorator = 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.decoratorparenlevel:
+            if self.indecorator:
                 self.indecorator = False
         elif self.passline:
             pass

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.