The HTML output accepts the `--msg-template` option.

Patch by Daniel Goldsmith. Closes issue #135.

1 files changed, 0 insertions, 767 deletions

diff --git a/checkers/classes.py b/checkers/classes.py
deleted file mode 100644
index 85a8507..0000000
--- a/checkers/classes.py
+++ /dev/null
@@ -1,767 +0,0 @@
-# Copyright (c) 2003-2013 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.
-"""classes checker for Python code
-"""
-from __future__ import generators
-import sys
-import astroid
-from astroid import YES, Instance, are_exclusive, AssAttr
-from astroid.bases import Generator
-
-from pylint.interfaces import IAstroidChecker
-from pylint.checkers import BaseChecker
-from pylint.checkers.utils import (PYMETHODS, overrides_a_method,
-    check_messages, is_attr_private, is_attr_protected, node_frame_class)
-
-if sys.version_info >= (3, 0):
-    NEXT_METHOD = '__next__'
-else:
-    NEXT_METHOD = 'next'
-ITER_METHODS = ('__iter__', '__getitem__')
-
-def class_is_abstract(node):
-    """return true if the given class node should be considered as an abstract
-    class
-    """
-    for method in node.methods():
-        if method.parent.frame() is node:
-            if method.is_abstract(pass_is_abstract=False):
-                return True
-    return False
-
-
-MSGS = {
-    'F0202': ('Unable to check methods signature (%s / %s)',
-              'method-check-failed',
-              'Used when PyLint has been unable to check methods signature \
-              compatibility for an unexpected reason. Please report this kind \
-              if you don\'t make sense of it.'),
-
-    'E0202': ('An attribute defined in %s line %s hides this method',
-              'method-hidden',
-              'Used when a class defines a method which is hidden by an '
-              'instance attribute from an ancestor class or set by some '
-              'client code.'),
-    'E0203': ('Access to member %r before its definition line %s',
-              'access-member-before-definition',
-              'Used when an instance member is accessed before it\'s actually\
-              assigned.'),
-    'W0201': ('Attribute %r defined outside __init__',
-              'attribute-defined-outside-init',
-              'Used when an instance attribute is defined outside the __init__\
-              method.'),
-
-    'W0212': ('Access to a protected member %s of a client class', # E0214
-              'protected-access',
-              'Used when a protected member (i.e. class member with a name \
-              beginning with an underscore) is access outside the class or a \
-              descendant of the class where it\'s defined.'),
-
-    'E0211': ('Method has no argument',
-              'no-method-argument',
-              'Used when a method which should have the bound instance as \
-              first argument has no argument defined.'),
-    'E0213': ('Method should have "self" as first argument',
-              'no-self-argument',
-              'Used when a method has an attribute different the "self" as\
-              first argument. This is considered as an error since this is\
-              a so common convention that you shouldn\'t break it!'),
-    'C0202': ('Class method %s should have %s as first argument', # E0212
-              'bad-classmethod-argument',
-              'Used when a class method has a first argument named differently '
-              'than the value specified in valid-classmethod-first-arg option '
-              '(default to "cls"), recommended to easily differentiate them '
-              'from regular instance methods.'),
-    'C0203': ('Metaclass method %s should have %s as first argument', # E0214
-              'bad-mcs-method-argument',
-              'Used when a metaclass method has a first agument named '
-              'differently than the value specified in valid-classmethod-first'
-              '-arg option (default to "cls"), recommended to easily '
-              'differentiate them from regular instance methods.'),
-    'C0204': ('Metaclass class method %s should have %s as first argument',
-              'bad-mcs-classmethod-argument',
-              'Used when a metaclass class method has a first argument named '
-              'differently than the value specified in valid-metaclass-'
-              'classmethod-first-arg option (default to "mcs"), recommended to '
-              'easily differentiate them from regular instance methods.'),
-
-    'W0211': ('Static method with %r as first argument',
-              'bad-staticmethod-argument',
-              'Used when a static method has "self" or a value specified in '
-              'valid-classmethod-first-arg option or '
-              'valid-metaclass-classmethod-first-arg option as first argument.'
-              ),
-    'R0201': ('Method could be a function',
-              'no-self-use',
-              'Used when a method doesn\'t use its bound instance, and so could\
-              be written as a function.'
-              ),
-
-    'E0221': ('Interface resolved to %s is not a class',
-              'interface-is-not-class',
-              'Used when a class claims to implement an interface which is not \
-              a class.'),
-    'E0222': ('Missing method %r from %s interface',
-              'missing-interface-method',
-              'Used when a method declared in an interface is missing from a \
-              class implementing this interface'),
-    'W0221': ('Arguments number differs from %s method',
-              'arguments-differ',
-              'Used when a method has a different number of arguments than in \
-              the implemented interface or in an overridden method.'),
-    'W0222': ('Signature differs from %s method',
-              'signature-differs',
-              'Used when a method signature is different than in the \
-              implemented interface or in an overridden method.'),
-    'W0223': ('Method %r is abstract in class %r but is not overridden',
-              'abstract-method',
-              'Used when an abstract method (i.e. raise NotImplementedError) is \
-              not overridden in concrete class.'
-              ),
-    'F0220': ('failed to resolve interfaces implemented by %s (%s)', # W0224
-              'unresolved-interface',
-              'Used when a PyLint as failed to find interfaces implemented by \
-               a class'),
-
-
-    'W0231': ('__init__ method from base class %r is not called',
-              'super-init-not-called',
-              'Used when an ancestor class method has an __init__ method \
-              which is not called by a derived class.'),
-    'W0232': ('Class has no __init__ method',
-              'no-init',
-              'Used when a class has no __init__ method, neither its parent \
-              classes.'),
-    'W0233': ('__init__ method from a non direct base class %r is called',
-              'non-parent-init-called',
-              'Used when an __init__ method is called on a class which is not \
-              in the direct ancestors for the analysed class.'),
-    'W0234': ('__iter__ returns non-iterator',
-              'non-iterator-returned',
-              'Used when an __iter__ method returns something which is not an \
-               iterable (i.e. has no `%s` method)' % NEXT_METHOD),
-    'E0235': ('__exit__ must accept 3 arguments: type, value, traceback',
-              'bad-context-manager',
-              'Used when the __exit__ special method, belonging to a \
-               context manager, does not accept 3 arguments \
-               (type, value, traceback).'),
-    'E0236': ('Invalid object %r in __slots__, must contain '
-              'only non empty strings',
-              'invalid-slots-object',
-              'Used when an invalid (non-string) object occurs in __slots__.'),
-    'E0238': ('Invalid __slots__ object',
-              'invalid-slots',
-              'Used when an invalid __slots__ is found in class. '
-              'Only a string, an iterable or a sequence is permitted.')
-
-
-    }
-
-
-class ClassChecker(BaseChecker):
-    """checks for :
-    * methods without self as first argument
-    * overridden methods signature
-    * access only to existent members via self
-    * attributes not defined in the __init__ method
-    * supported interfaces implementation
-    * unreachable code
-    """
-
-    __implements__ = (IAstroidChecker,)
-
-    # configuration section name
-    name = 'classes'
-    # messages
-    msgs = MSGS
-    priority = -2
-    # configuration options
-    options = (('ignore-iface-methods',
-                {'default' : (#zope interface
-        'isImplementedBy', 'deferred', 'extends', 'names',
-        'namesAndDescriptions', 'queryDescriptionFor', 'getBases',
-        'getDescriptionFor', 'getDoc', 'getName', 'getTaggedValue',
-        'getTaggedValueTags', 'isEqualOrExtendedBy', 'setTaggedValue',
-        'isImplementedByInstancesOf',
-        # twisted
-        'adaptWith',
-        # logilab.common interface
-        'is_implemented_by'),
-                 'type' : 'csv',
-                 'metavar' : '<method names>',
-                 'help' : 'List of interface methods to ignore, \
-separated by a comma. This is used for instance to not check methods defines \
-in Zope\'s Interface base class.'}
-                ),
-
-               ('defining-attr-methods',
-                {'default' : ('__init__', '__new__', 'setUp'),
-                 'type' : 'csv',
-                 'metavar' : '<method names>',
-                 'help' : 'List of method names used to declare (i.e. assign) \
-instance attributes.'}
-                ),
-               ('valid-classmethod-first-arg',
-                {'default' : ('cls',),
-                 'type' : 'csv',
-                 'metavar' : '<argument names>',
-                 'help' : 'List of valid names for the first argument in \
-a class method.'}
-                ),
-               ('valid-metaclass-classmethod-first-arg',
-                {'default' : ('mcs',),
-                 'type' : 'csv',
-                 'metavar' : '<argument names>',
-                 'help' : 'List of valid names for the first argument in \
-a metaclass class method.'}
-                ),
-
-               )
-
-    def __init__(self, linter=None):
-        BaseChecker.__init__(self, linter)
-        self._accessed = []
-        self._first_attrs = []
-        self._meth_could_be_func = None
-
-    def visit_class(self, node):
-        """init visit variable _accessed and check interfaces
-        """
-        self._accessed.append({})
-        self._check_bases_classes(node)
-        self._check_interfaces(node)
-        # if not an interface, exception, metaclass
-        if node.type == 'class':
-            try:
-                node.local_attr('__init__')
-            except astroid.NotFoundError:
-                self.add_message('W0232', args=node, node=node)
-        self._check_slots(node)
-
-    @check_messages('E0203', 'W0201')
-    def leave_class(self, cnode):
-        """close a class node:
-        check that instance attributes are defined in __init__ and check
-        access to existent members
-        """
-        # check access to existent members on non metaclass classes
-        accessed = self._accessed.pop()
-        if cnode.type != 'metaclass':
-            self._check_accessed_members(cnode, accessed)
-        # checks attributes are defined in an allowed method such as __init__
-        if 'W0201' not in self.active_msgs:
-            return
-        defining_methods = self.config.defining_attr_methods
-        for attr, nodes in cnode.instance_attrs.iteritems():
-            nodes = [n for n in nodes if not
-                    isinstance(n.statement(), (astroid.Delete, astroid.AugAssign))]
-            if not nodes:
-                continue # error detected by typechecking
-            attr_defined = False
-            # check if any method attr is defined in is a defining method
-            for node in nodes:
-                if node.frame().name in defining_methods:
-                    attr_defined = True
-            if not attr_defined:
-                # check attribute is defined in a parent's __init__
-                for parent in cnode.instance_attr_ancestors(attr):
-                    attr_defined = False
-                    # check if any parent method attr is defined in is a defining method
-                    for node in parent.instance_attrs[attr]:
-                        if node.frame().name in defining_methods:
-                            attr_defined = True
-                    if attr_defined:
-                        # we're done :)
-                        break
-                else:
-                    # check attribute is defined as a class attribute
-                    try:
-                        cnode.local_attr(attr)
-                    except astroid.NotFoundError:
-                        self.add_message('W0201', args=attr, node=node)
-
-    def visit_function(self, node):
-        """check method arguments, overriding"""
-        # ignore actual functions
-        if not node.is_method():
-            return
-        klass = node.parent.frame()
-        self._meth_could_be_func = True
-        # check first argument is self if this is actually a method
-        self._check_first_arg_for_type(node, klass.type == 'metaclass')
-        if node.name == '__init__':
-            self._check_init(node)
-            return
-        # check signature if the method overloads inherited method
-        for overridden in klass.local_attr_ancestors(node.name):
-            # get astroid for the searched method
-            try:
-                meth_node = overridden[node.name]
-            except KeyError:
-                # we have found the method but it's not in the local
-                # dictionary.
-                # This may happen with astroid build from living objects
-                continue
-            if not isinstance(meth_node, astroid.Function):
-                continue
-            self._check_signature(node, meth_node, 'overridden')
-            break
-        if node.decorators:
-            for decorator in node.decorators.nodes:
-                if isinstance(decorator, astroid.Getattr) and \
-                        decorator.attrname in ('getter', 'setter', 'deleter'):
-                    # attribute affectation will call this method, not hiding it
-                    return
-                if isinstance(decorator, astroid.Name) and decorator.name == 'property':
-                    # attribute affectation will either call a setter or raise
-                    # an attribute error, anyway not hiding the function
-                    return
-        # check if the method is hidden by an attribute
-        try:
-            overridden = klass.instance_attr(node.name)[0] # XXX
-            args = (overridden.root().name, overridden.fromlineno)
-            self.add_message('E0202', args=args, node=node)
-        except astroid.NotFoundError:
-            pass
-
-        # check non-iterators in __iter__
-        if node.name == '__iter__':
-            self._check_iter(node)
-        elif node.name == '__exit__':
-            self._check_exit(node)
-
-    def _check_slots(self, node):
-        if '__slots__' not in node.locals:
-            return
-        for slots in node.igetattr('__slots__'):
-            # check if __slots__ is a valid type
-            for meth in ITER_METHODS:
-                try:
-                    slots.getattr(meth)
-                    break
-                except astroid.NotFoundError:
-                    continue
-            else:
-                self.add_message('invalid-slots', node=node)
-                continue
-
-            if isinstance(slots, astroid.Const):
-                # a string, ignore the following checks
-                continue
-            if not hasattr(slots, 'itered'):
-                # we can't obtain the values, maybe a .deque?
-                continue
-
-            if isinstance(slots, astroid.Dict):
-                values = [item[0] for item in slots.items]
-            else:
-                values = slots.itered()
-            if values is YES:
-                return
-
-            for elt in values:
-                if elt is YES:
-                    continue
-                if (not isinstance(elt, astroid.Const) or
-                    not isinstance(elt.value, str)):
-                    self.add_message('invalid-slots-object',
-                                     args=elt.as_string(),
-                                     node=elt)
-                    continue
-                if not elt.value:
-                    self.add_message('invalid-slots-object',
-                                     args=elt.as_string(),
-                                     node=elt)
-
-    def _check_iter(self, node):
-        try:
-            infered = node.infer_call_result(node)
-        except astroid.InferenceError:
-            return
-
-        for infered_node in infered:
-            if (infered_node is YES
-                or isinstance(infered_node, Generator)):
-                continue
-            if isinstance(infered_node, astroid.Instance):
-                try:
-                    infered_node.local_attr(NEXT_METHOD)
-                except astroid.NotFoundError:
-                    self.add_message('non-iterator-returned',
-                                     node=node)
-                    break
-
-    def _check_exit(self, node):
-        positional = sum(1 for arg in node.args.args if arg.name != 'self')
-        if positional < 3 and not node.args.vararg:
-            self.add_message('bad-context-manager',
-                             node=node)
-        elif positional > 3:
-            self.add_message('bad-context-manager',
-                             node=node)
-
-    def leave_function(self, node):
-        """on method node, check if this method couldn't be a function
-
-        ignore class, static and abstract methods, initializer,
-        methods overridden from a parent class and any
-        kind of method defined in an interface for this warning
-        """
-        if node.is_method():
-            if node.args.args is not None:
-                self._first_attrs.pop()
-            if 'R0201' not in self.active_msgs:
-                return
-            class_node = node.parent.frame()
-            if (self._meth_could_be_func and node.type == 'method'
-                and not node.name in PYMETHODS
-                and not (node.is_abstract() or
-                         overrides_a_method(class_node, node.name))
-                and class_node.type != 'interface'):
-                self.add_message('R0201', node=node)
-
-    def visit_getattr(self, node):
-        """check if the getattr is an access to a class member
-        if so, register it. Also check for access to protected
-        class member from outside its class (but ignore __special__
-        methods)
-        """
-        attrname = node.attrname
-        # Check self
-        if self.is_first_attr(node):
-            self._accessed[-1].setdefault(attrname, []).append(node)
-            return
-        if 'W0212' not in self.active_msgs:
-            return
-
-        self._check_protected_attribute_access(node)
-
-    def visit_assign(self, assign_node):
-        if 'W0212' not in self.active_msgs:
-            return
-
-        node = assign_node.targets[0]
-        if not isinstance(node, AssAttr):
-            return
-
-        if self.is_first_attr(node):
-            return
-
-        self._check_protected_attribute_access(node)
-
-    def _check_protected_attribute_access(self, node):
-        '''Given an attribute access node (set or get), check if attribute
-        access is legitimate. Call _check_first_attr with node before calling
-        this method. Valid cases are:
-        * self._attr in a method or cls._attr in a classmethod. Checked by
-        _check_first_attr.
-        * Klass._attr inside "Klass" class.
-        * Klass2._attr inside "Klass" class when Klass2 is a base class of
-            Klass.
-        '''
-        attrname = node.attrname
-
-        if is_attr_protected(attrname):
-
-            klass = node_frame_class(node)
-
-            # XXX infer to be more safe and less dirty ??
-            # in classes, check we are not getting a parent method
-            # through the class object or through super
-            callee = node.expr.as_string()
-
-            # We are not in a class, no remaining valid case
-            if klass is None:
-                self.add_message('W0212', node=node, args=attrname)
-                return
-
-            # If the expression begins with a call to super, that's ok.
-            if isinstance(node.expr, astroid.CallFunc) and \
-               isinstance(node.expr.func, astroid.Name) and \
-               node.expr.func.name == 'super':
-                return
-
-            # We are in a class, one remaining valid cases, Klass._attr inside
-            # Klass
-            if not (callee == klass.name or callee in klass.basenames):
-                self.add_message('W0212', node=node, args=attrname)
-
-    def visit_name(self, node):
-        """check if the name handle an access to a class member
-        if so, register it
-        """
-        if self._first_attrs and (node.name == self._first_attrs[-1] or
-                                  not self._first_attrs[-1]):
-            self._meth_could_be_func = False
-
-    def _check_accessed_members(self, node, accessed):
-        """check that accessed members are defined"""
-        # XXX refactor, probably much simpler now that E0201 is in type checker
-        for attr, nodes in accessed.iteritems():
-            # deactivate "except doesn't do anything", that's expected
-            # pylint: disable=W0704
-            # is it a class attribute ?
-            try:
-                node.local_attr(attr)
-                # yes, stop here
-                continue
-            except astroid.NotFoundError:
-                pass
-            # is it an instance attribute of a parent class ?
-            try:
-                node.instance_attr_ancestors(attr).next()
-                # yes, stop here
-                continue
-            except StopIteration:
-                pass
-            # is it an instance attribute ?
-            try:
-                defstmts = node.instance_attr(attr)
-            except astroid.NotFoundError:
-                pass
-            else:
-                if len(defstmts) == 1:
-                    defstmt = defstmts[0]
-                    # check that if the node is accessed in the same method as
-                    # it's defined, it's accessed after the initial assignment
-                    frame = defstmt.frame()
-                    lno = defstmt.fromlineno
-                    for _node in nodes:
-                        if _node.frame() is frame and _node.fromlineno < lno \
-                           and not are_exclusive(_node.statement(), defstmt, ('AttributeError', 'Exception', 'BaseException')):
-                            self.add_message('E0203', node=_node,
-                                             args=(attr, lno))
-
-    def _check_first_arg_for_type(self, node, metaclass=0):
-        """check the name of first argument, expect:
-
-        * 'self' for a regular method
-        * 'cls' for a class method or a metaclass regular method (actually
-          valid-classmethod-first-arg value)
-        * 'mcs' for a metaclass class method (actually
-          valid-metaclass-classmethod-first-arg)
-        * not one of the above for a static method
-        """
-        # don't care about functions with unknown argument (builtins)
-        if node.args.args is None:
-            return
-        first_arg = node.args.args and node.argnames()[0]
-        self._first_attrs.append(first_arg)
-        first = self._first_attrs[-1]
-        # static method
-        if node.type == 'staticmethod':
-            if (first_arg == 'self' or
-                first_arg in self.config.valid_classmethod_first_arg or
-                first_arg in self.config.valid_metaclass_classmethod_first_arg):
-                self.add_message('W0211', args=first, node=node)
-                return
-            self._first_attrs[-1] = None
-        # class / regular method with no args
-        elif not node.args.args:
-            self.add_message('E0211', node=node)
-        # metaclass
-        elif metaclass:
-            # metaclass __new__ or classmethod
-            if node.type == 'classmethod':
-                self._check_first_arg_config(first,
-                    self.config.valid_metaclass_classmethod_first_arg, node,
-                    'C0204', node.name)
-            # metaclass regular method
-            else:
-                self._check_first_arg_config(first,
-                    self.config.valid_classmethod_first_arg, node, 'C0203',
-                    node.name)
-        # regular class
-        else:
-            # class method
-            if node.type == 'classmethod':
-                self._check_first_arg_config(first,
-                    self.config.valid_classmethod_first_arg, node, 'C0202',
-                    node.name)
-            # regular method without self as argument
-            elif first != 'self':
-                self.add_message('E0213', node=node)
-
-    def _check_first_arg_config(self, first, config, node, message,
-                                method_name):
-        if first not in config:
-            if len(config) == 1:
-                valid = repr(config[0])
-            else:
-                valid = ', '.join(
-                  repr(v)
-                  for v in config[:-1])
-                valid = '%s or %r' % (
-                    valid, config[-1])
-            self.add_message(message, args=(method_name, valid), node=node)
-
-    def _check_bases_classes(self, node):
-        """check that the given class node implements abstract methods from
-        base classes
-        """
-        # check if this class abstract
-        if class_is_abstract(node):
-            return
-        for method in node.methods():
-            owner = method.parent.frame()
-            if owner is node:
-                continue
-            # owner is not this class, it must be a parent class
-            # check that the ancestor's method is not abstract
-            if method.name in node.locals:
-                # it is redefined as an attribute or with a descriptor
-                continue
-            if method.is_abstract(pass_is_abstract=False):
-                self.add_message('W0223', node=node,
-                                 args=(method.name, owner.name))
-
-    def _check_interfaces(self, node):
-        """check that the given class node really implements declared
-        interfaces
-        """
-        e0221_hack = [False]
-        def iface_handler(obj):
-            """filter interface objects, it should be classes"""
-            if not isinstance(obj, astroid.Class):
-                e0221_hack[0] = True
-                self.add_message('E0221', node=node,
-                                 args=(obj.as_string(),))
-                return False
-            return True
-        ignore_iface_methods = self.config.ignore_iface_methods
-        try:
-            for iface in node.interfaces(handler_func=iface_handler):
-                for imethod in iface.methods():
-                    name = imethod.name
-                    if name.startswith('_') or name in ignore_iface_methods:
-                        # don't check method beginning with an underscore,
-                        # usually belonging to the interface implementation
-                        continue
-                    # get class method astroid
-                    try:
-                        method = node_method(node, name)
-                    except astroid.NotFoundError:
-                        self.add_message('E0222', args=(name, iface.name),
-                                         node=node)
-                        continue
-                    # ignore inherited methods
-                    if method.parent.frame() is not node:
-                        continue
-                    # check signature
-                    self._check_signature(method, imethod,
-                                         '%s interface' % iface.name)
-        except astroid.InferenceError:
-            if e0221_hack[0]:
-                return
-            implements = Instance(node).getattr('__implements__')[0]
-            assignment = implements.parent
-            assert isinstance(assignment, astroid.Assign)
-            # assignment.expr can be a Name or a Tuple or whatever.
-            # Use as_string() for the message
-            # FIXME: in case of multiple interfaces, find which one could not
-            #        be resolved
-            self.add_message('F0220', node=implements,
-                             args=(node.name, assignment.value.as_string()))
-
-    def _check_init(self, node):
-        """check that the __init__ method call super or ancestors'__init__
-        method
-        """
-        if not set(('W0231', 'W0233')) & self.active_msgs:
-            return
-        klass_node = node.parent.frame()
-        to_call = _ancestors_to_call(klass_node)
-        not_called_yet = dict(to_call)
-        for stmt in node.nodes_of_class(astroid.CallFunc):
-            expr = stmt.func
-            if not isinstance(expr, astroid.Getattr) \
-                   or expr.attrname != '__init__':
-                continue
-            # skip the test if using super
-            if isinstance(expr.expr, astroid.CallFunc) and \
-               isinstance(expr.expr.func, astroid.Name) and \
-               expr.expr.func.name == 'super':
-                return
-            try:
-                klass = expr.expr.infer().next()
-                if klass is YES:
-                    continue
-                try:
-                    del not_called_yet[klass]
-                except KeyError:
-                    if klass not in to_call:
-                        self.add_message('W0233', node=expr, args=klass.name)
-            except astroid.InferenceError:
-                continue
-        for klass, method in not_called_yet.iteritems():
-            if klass.name == 'object' or method.parent.name == 'object':
-                continue
-            self.add_message('W0231', args=klass.name, node=node)
-
-    def _check_signature(self, method1, refmethod, class_type):
-        """check that the signature of the two given methods match
-
-        class_type is in 'class', 'interface'
-        """
-        if not (isinstance(method1, astroid.Function)
-                and isinstance(refmethod, astroid.Function)):
-            self.add_message('F0202', args=(method1, refmethod), node=method1)
-            return
-        # don't care about functions with unknown argument (builtins)
-        if method1.args.args is None or refmethod.args.args is None:
-            return
-        # if we use *args, **kwargs, skip the below checks
-        if method1.args.vararg or method1.args.kwarg:
-            return
-        if is_attr_private(method1.name):
-            return
-        if len(method1.args.args) != len(refmethod.args.args):
-            self.add_message('W0221', args=class_type, node=method1)
-        elif len(method1.args.defaults) < len(refmethod.args.defaults):
-            self.add_message('W0222', args=class_type, node=method1)
-
-    def is_first_attr(self, node):
-        """Check that attribute lookup name use first attribute variable name
-        (self for method, cls for classmethod and mcs for metaclass).
-        """
-        return self._first_attrs and isinstance(node.expr, astroid.Name) and \
-                   node.expr.name == self._first_attrs[-1]
-
-def _ancestors_to_call(klass_node, method='__init__'):
-    """return a dictionary where keys are the list of base classes providing
-    the queried method, and so that should/may be called from the method node
-    """
-    to_call = {}
-    for base_node in klass_node.ancestors(recurs=False):
-        try:
-            to_call[base_node] = base_node.igetattr(method).next()
-        except astroid.InferenceError:
-            continue
-    return to_call
-
-
-def node_method(node, method_name):
-    """get astroid for <method_name> on the given class node, ensuring it
-    is a Function node
-    """
-    for n in node.local_attr(method_name):
-        if isinstance(n, astroid.Function):
-            return n
-    raise astroid.NotFoundError(method_name)
-
-def register(linter):
-    """required method to auto register this checker """
-    linter.register_checker(ClassChecker(linter))