pylint: upgrade to 1.4.0

third_party/pylint/checkers/newstyle.py

 # Copyright (c) 2005-2014 LOGILAB S.A. (Paris, FRANCE).
 # http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This program is free software; you can redistribute it and/or modify it under
 # the terms of the GNU General Public License as published by the Free Software
 # Foundation; either version 2 of the License, or (at your option) any later
 # version.
 #
 # This program is distributed in the hope that it will be useful, but WITHOUT
 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 # FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License along with
 # this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 """check for new / old style related problems
 """
 import sys
 
 import astroid
 
-from pylint.interfaces import IAstroidChecker
+from pylint.interfaces import IAstroidChecker, INFERENCE, INFERENCE_FAILURE, HIGH
 from pylint.checkers import BaseChecker
-from pylint.checkers.utils import check_messages
+from pylint.checkers.utils import (
+    check_messages,
+    has_known_bases,
+    node_frame_class,
+)
 
 MSGS = {
     'E1001': ('Use of __slots__ on an old style class',
               'slots-on-old-class',
               'Used when an old style class uses the __slots__ attribute.',
               {'maxversion': (3, 0)}),
     'E1002': ('Use of super on an old style class',
               'super-on-old-class',
               'Used when an old style class uses the super builtin.',
               {'maxversion': (3, 0)}),
     'E1003': ('Bad first argument %r given to super()',
               'bad-super-call',
               'Used when another argument than the current class is given as \
               first argument of the super builtin.'),
     'E1004': ('Missing argument to super()',
               'missing-super-argument',
               'Used when the super builtin didn\'t receive an \
                argument.',
               {'maxversion': (3, 0)}),
     'W1001': ('Use of "property" on an old style class',
               'property-on-old-class',
-              'Used when PyLint detect the use of the builtin "property" \
+              'Used when Pylint detect the use of the builtin "property" \
               on an old style class while this is relying on new style \
               classes features.',
               {'maxversion': (3, 0)}),
     'C1001': ('Old-style class defined.',
               'old-style-class',
               'Used when a class is defined that does not inherit from another'
               'class and does not inherit explicitly from "object".',
               {'maxversion': (3, 0)})
     }
 
@@ skipping 10 matching lines @@
     # configuration section name
     name = 'newstyle'
     # messages
     msgs = MSGS
     priority = -2
     # configuration options
     options = ()
 
     @check_messages('slots-on-old-class', 'old-style-class')
     def visit_class(self, node):
-        """check __slots__ usage
+        """ Check __slots__ in old style classes and old
+        style class definition.
         """
         if '__slots__' in node and not node.newstyle:
-            self.add_message('slots-on-old-class', node=node)
+            confidence = (INFERENCE if has_known_bases(node)
+                          else INFERENCE_FAILURE)
+            self.add_message('slots-on-old-class', node=node,
+                             confidence=confidence)
         # The node type could be class, exception, metaclass, or
         # interface.  Presumably, the non-class-type nodes would always
         # have an explicit base class anyway.
-        if not node.bases and node.type == 'class':
-            self.add_message('old-style-class', node=node)
+        if not node.bases and node.type == 'class' and not node.metaclass():
+            # We use confidence HIGH here because this message should only ever
+            # be emitted for classes at the root of the inheritance hierarchyself.
+            self.add_message('old-style-class', node=node, confidence=HIGH)
 
     @check_messages('property-on-old-class')
     def visit_callfunc(self, node):
         """check property usage"""
         parent = node.parent.frame()
         if (isinstance(parent, astroid.Class) and
                 not parent.newstyle and
                 isinstance(node.func, astroid.Name)):
+            confidence = (INFERENCE if has_known_bases(parent)
+                          else INFERENCE_FAILURE)
             name = node.func.name
             if name == 'property':
-                self.add_message('property-on-old-class', node=node)
+                self.add_message('property-on-old-class', node=node,
+                                 confidence=confidence)
 
     @check_messages('super-on-old-class', 'bad-super-call', 'missing-super-argument')
     def visit_function(self, node):
         """check use of super"""
         # ignore actual functions or method within a new style class
         if not node.is_method():
             return
         klass = node.parent.frame()
         for stmt in node.nodes_of_class(astroid.CallFunc):
+            if node_frame_class(stmt) != node_frame_class(node):
+                # Don't look down in other scopes.
+                continue
             expr = stmt.func
             if not isinstance(expr, astroid.Getattr):
                 continue
             call = expr.expr
             # skip the test if using super
             if isinstance(call, astroid.CallFunc) and \
                isinstance(call.func, astroid.Name) and \
                call.func.name == 'super':
+                confidence = (INFERENCE if has_known_bases(klass)
+                              else INFERENCE_FAILURE)
                 if not klass.newstyle:
                     # super should not be used on an old style class
-                    self.add_message('super-on-old-class', node=node)
+                    self.add_message('super-on-old-class', node=node,
+                                     confidence=confidence)
                 else:
                     # super first arg should be the class
                     if not call.args and sys.version_info[0] == 3:
                         # unless Python 3
                         continue
 
                     try:
-                        supcls = (call.args and call.args[0].infer().next()
+                        supcls = (call.args and next(call.args[0].infer())
                                   or None)
                     except astroid.InferenceError:
                         continue
 
                     if supcls is None:
-                        self.add_message('missing-super-argument', node=call)
+                        self.add_message('missing-super-argument', node=call,
+                                         confidence=confidence)
                         continue
 
                     if klass is not supcls:
                         name = None
                         # if supcls is not YES, then supcls was infered
                         # and use its name. Otherwise, try to look
                         # for call.args[0].name
                         if supcls is not astroid.YES:
                             name = supcls.name
                         else:
                             if hasattr(call.args[0], 'name'):
                                 name = call.args[0].name
                         if name is not None:
                             self.add_message('bad-super-call',
                                              node=call,
-                                             args=(name, ))
+                                             args=(name, ),
+                                             confidence=confidence)
 
 
 def register(linter):
     """required method to auto register this checker """
     linter.register_checker(NewStyleConflictChecker(linter))