Plugins/CheckerPlugins/SyntaxChecker/pyflakes/checker.py

branch
Py2 comp.
changeset 3456
96232974dcdb
parent 3161
06f57a834adf
parent 3177
5af61402d74d
child 3544
431c842fd09a
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugins/CheckerPlugins/SyntaxChecker/pyflakes/checker.py	Sun Mar 30 22:00:14 2014 +0200
@@ -0,0 +1,857 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2010 - 2014 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+# Original (c) 2005-2010 Divmod, Inc.
+#
+# This module is based on pyflakes but was modified to work with eric5
+"""
+Main module.
+
+Implement the central Checker class.
+Also, it models the Bindings and Scopes.
+"""
+import doctest
+import os
+import sys
+try:
+    builtin_vars = dir(__import__('builtins'))
+    PY2 = False
+except ImportError:
+    builtin_vars = dir(__import__('__builtin__'))
+    PY2 = True
+
+try:
+    import ast
+    iter_child_nodes = ast.iter_child_nodes
+except ImportError:     # Python 2.5
+    import _ast as ast
+
+    if 'decorator_list' not in ast.ClassDef._fields:
+        # Patch the missing attribute 'decorator_list'
+        ast.ClassDef.decorator_list = ()
+        ast.FunctionDef.decorator_list = property(lambda s: s.decorators)
+
+    def iter_child_nodes(node):
+        """
+        Yield all direct child nodes of *node*, that is, all fields that
+        are nodes and all items of fields that are lists of nodes.
+        """
+        for name in node._fields:
+            field = getattr(node, name, None)
+            if isinstance(field, ast.AST):
+                yield field
+            elif isinstance(field, list):
+                for item in field:
+                    yield item
+# Python >= 3.3 uses ast.Try instead of (ast.TryExcept + ast.TryFinally)
+if hasattr(ast, 'Try'):
+    ast_TryExcept = ast.Try
+    ast_TryFinally = ()
+else:
+    ast_TryExcept = ast.TryExcept
+    ast_TryFinally = ast.TryFinally
+
+from . import messages
+
+
+if PY2:
+    def getNodeType(node_class):
+        # workaround str.upper() which is locale-dependent
+        return str(unicode(node_class.__name__).upper())  # __IGNORE_WARNING__
+else:
+    def getNodeType(node_class):
+        return node_class.__name__.upper()
+
+
+class Binding(object):
+    """
+    Represents the binding of a value to a name.
+
+    The checker uses this to keep track of which names have been bound and
+    which names have not. See L{Assignment} for a special type of binding that
+    is checked with stricter rules.
+
+    @ivar used: pair of (L{Scope}, line-number) indicating the scope and
+                line number that this binding was last used
+    """
+
+    def __init__(self, name, source):
+        self.name = name
+        self.source = source
+        self.used = False
+
+    def __str__(self):
+        return self.name
+
+    def __repr__(self):
+        return '<%s object %r from line %r at 0x%x>' % (self.__class__.__name__,
+                                                        self.name,
+                                                        self.source.lineno,
+                                                        id(self))
+
+
+class Importation(Binding):
+    """
+    A binding created by an import statement.
+
+    @ivar fullName: The complete name given to the import statement,
+        possibly including multiple dotted components.
+    @type fullName: C{str}
+    """
+    def __init__(self, name, source):
+        self.fullName = name
+        name = name.split('.')[0]
+        super(Importation, self).__init__(name, source)
+
+
+class Argument(Binding):
+    """
+    Represents binding a name as an argument.
+    """
+
+
+class Definition(Binding):
+    """
+    A binding that defines a function or a class.
+    """
+
+
+class Assignment(Binding):
+    """
+    Represents binding a name with an explicit assignment.
+
+    The checker will raise warnings for any Assignment that isn't used. Also,
+    the checker does not consider assignments in tuple/list unpacking to be
+    Assignments, rather it treats them as simple Bindings.
+    """
+
+
+class FunctionDefinition(Definition):
+    pass
+
+
+class ClassDefinition(Definition):
+    pass
+
+
+class ExportBinding(Binding):
+    """
+    A binding created by an C{__all__} assignment.  If the names in the list
+    can be determined statically, they will be treated as names for export and
+    additional checking applied to them.
+
+    The only C{__all__} assignment that can be recognized is one which takes
+    the value of a literal list containing literal strings.  For example::
+
+        __all__ = ["foo", "bar"]
+
+    Names which are imported and not otherwise used but appear in the value of
+    C{__all__} will not have an unused import warning reported for them.
+    """
+    def names(self):
+        """
+        Return a list of the names referenced by this binding.
+        """
+        names = []
+        if isinstance(self.source, ast.List):
+            for node in self.source.elts:
+                if isinstance(node, ast.Str):
+                    names.append(node.s)
+        return names
+
+
+class Scope(dict):
+    importStarred = False       # set to True when import * is found
+
+    def __repr__(self):
+        scope_cls = self.__class__.__name__
+        return '<%s at 0x%x %s>' % (scope_cls, id(self), dict.__repr__(self))
+
+
+class ClassScope(Scope):
+    pass
+
+
+class FunctionScope(Scope):
+    """
+    I represent a name scope for a function.
+
+    @ivar globals: Names declared 'global' in this function.
+    """
+    usesLocals = False
+    alwaysUsed = set(['__tracebackhide__',
+                      '__traceback_info__', '__traceback_supplement__'])
+
+    def __init__(self):
+        super(FunctionScope, self).__init__()
+        # Simplify: manage the special locals as globals
+        self.globals = self.alwaysUsed.copy()
+
+    def unusedAssignments(self):
+        """
+        Return a generator for the assignments which have not been used.
+        """
+        for name, binding in self.items():
+            if (not binding.used and name not in self.globals
+                    and not self.usesLocals
+                    and isinstance(binding, Assignment)):
+                yield name, binding
+
+
+class GeneratorScope(Scope):
+    pass
+
+
+class ModuleScope(Scope):
+    pass
+
+
+# Globally defined names which are not attributes of the builtins module, or
+# are only present on some platforms.
+_MAGIC_GLOBALS = ['__file__', '__builtins__', 'WindowsError']
+
+
+def getNodeName(node):
+    # Returns node.id, or node.name, or None
+    if hasattr(node, 'id'):     # One of the many nodes with an id
+        return node.id
+    if hasattr(node, 'name'):   # a ExceptHandler node
+        return node.name
+
+
+class Checker(object):
+    """
+    I check the cleanliness and sanity of Python code.
+
+    @ivar _deferredFunctions: Tracking list used by L{deferFunction}.  Elements
+        of the list are two-tuples.  The first element is the callable passed
+        to L{deferFunction}.  The second element is a copy of the scope stack
+        at the time L{deferFunction} was called.
+
+    @ivar _deferredAssignments: Similar to C{_deferredFunctions}, but for
+        callables which are deferred assignment checks.
+    """
+
+    nodeDepth = 0
+    offset = None
+    traceTree = False
+    withDoctest = ('PYFLAKES_NODOCTEST' not in os.environ)
+
+    builtIns = set(builtin_vars).union(_MAGIC_GLOBALS)
+    _customBuiltIns = os.environ.get('PYFLAKES_BUILTINS')
+    if _customBuiltIns:
+        builtIns.update(_customBuiltIns.split(','))
+    del _customBuiltIns
+
+    def __init__(self, tree, filename='(none)', builtins=None):
+        self._nodeHandlers = {}
+        self._deferredFunctions = []
+        self._deferredAssignments = []
+        self.deadScopes = []
+        self.messages = []
+        self.filename = filename
+        if builtins:
+            self.builtIns = self.builtIns.union(builtins)
+        self.scopeStack = [ModuleScope()]
+        self.exceptHandlers = [()]
+        self.futuresAllowed = True
+        self.root = tree
+        self.handleChildren(tree)
+        self.runDeferred(self._deferredFunctions)
+        # Set _deferredFunctions to None so that deferFunction will fail
+        # noisily if called after we've run through the deferred functions.
+        self._deferredFunctions = None
+        self.runDeferred(self._deferredAssignments)
+        # Set _deferredAssignments to None so that deferAssignment will fail
+        # noisily if called after we've run through the deferred assignments.
+        self._deferredAssignments = None
+        del self.scopeStack[1:]
+        self.popScope()
+        self.checkDeadScopes()
+
+    def deferFunction(self, callable):
+        """
+        Schedule a function handler to be called just before completion.
+
+        This is used for handling function bodies, which must be deferred
+        because code later in the file might modify the global scope. When
+        `callable` is called, the scope at the time this is called will be
+        restored, however it will contain any new bindings added to it.
+        """
+        self._deferredFunctions.append((callable, self.scopeStack[:], self.offset))
+
+    def deferAssignment(self, callable):
+        """
+        Schedule an assignment handler to be called just after deferred
+        function handlers.
+        """
+        self._deferredAssignments.append((callable, self.scopeStack[:], self.offset))
+
+    def runDeferred(self, deferred):
+        """
+        Run the callables in C{deferred} using their associated scope stack.
+        """
+        for handler, scope, offset in deferred:
+            self.scopeStack = scope
+            self.offset = offset
+            handler()
+
+    @property
+    def scope(self):
+        return self.scopeStack[-1]
+
+    def popScope(self):
+        self.deadScopes.append(self.scopeStack.pop())
+
+    def checkDeadScopes(self):
+        """
+        Look at scopes which have been fully examined and report names in them
+        which were imported but unused.
+        """
+        for scope in self.deadScopes:
+            export = isinstance(scope.get('__all__'), ExportBinding)
+            if export:
+                all = scope['__all__'].names()
+                if not scope.importStarred and \
+                   os.path.basename(self.filename) != '__init__.py':
+                    # Look for possible mistakes in the export list
+                    undefined = set(all) - set(scope)
+                    for name in undefined:
+                        self.report(messages.UndefinedExport,
+                                    scope['__all__'].source, name)
+            else:
+                all = []
+
+            # Look for imported names that aren't used.
+            for importation in scope.values():
+                if isinstance(importation, Importation):
+                    if not importation.used and importation.name not in all:
+                        self.report(messages.UnusedImport,
+                                    importation.source, importation.name)
+
+    def pushScope(self, scopeClass=FunctionScope):
+        self.scopeStack.append(scopeClass())
+
+    def pushFunctionScope(self):    # XXX Deprecated
+        self.pushScope(FunctionScope)
+
+    def pushClassScope(self):       # XXX Deprecated
+        self.pushScope(ClassScope)
+
+    def report(self, messageClass, *args, **kwargs):
+        self.messages.append(messageClass(self.filename, *args, **kwargs))
+
+    def hasParent(self, node, kind):
+        while hasattr(node, 'parent'):
+            node = node.parent
+            if isinstance(node, kind):
+                return True
+
+    def getCommonAncestor(self, lnode, rnode, stop=None):
+        if not stop:
+            stop = self.root
+        if lnode is rnode:
+            return lnode
+        if stop in (lnode, rnode):
+            return stop
+
+        if not hasattr(lnode, 'parent') or not hasattr(rnode, 'parent'):
+            return
+        if (lnode.level > rnode.level):
+            return self.getCommonAncestor(lnode.parent, rnode, stop)
+        if (rnode.level > lnode.level):
+            return self.getCommonAncestor(lnode, rnode.parent, stop)
+        return self.getCommonAncestor(lnode.parent, rnode.parent, stop)
+
+    def descendantOf(self, node, ancestors, stop=None):
+        for a in ancestors:
+            if self.getCommonAncestor(node, a, stop) not in (stop, None):
+                return True
+        return False
+
+    def onFork(self, parent, lnode, rnode, items):
+        return (self.descendantOf(lnode, items, parent) ^
+                self.descendantOf(rnode, items, parent))
+
+    def differentForks(self, lnode, rnode):
+        """True, if lnode and rnode are located on different forks of IF/TRY"""
+        ancestor = self.getCommonAncestor(lnode, rnode)
+        if isinstance(ancestor, ast.If):
+            for fork in (ancestor.body, ancestor.orelse):
+                if self.onFork(ancestor, lnode, rnode, fork):
+                    return True
+        elif isinstance(ancestor, ast_TryExcept):
+            body = ancestor.body + ancestor.orelse
+            for fork in [body] + [[hdl] for hdl in ancestor.handlers]:
+                if self.onFork(ancestor, lnode, rnode, fork):
+                    return True
+        elif isinstance(ancestor, ast_TryFinally):
+            if self.onFork(ancestor, lnode, rnode, ancestor.body):
+                return True
+        return False
+
+    def addBinding(self, node, value, reportRedef=True):
+        """
+        Called when a binding is altered.
+
+        - `node` is the statement responsible for the change
+        - `value` is the optional new value, a Binding instance, associated
+          with the binding; if None, the binding is deleted if it exists.
+        - if `reportRedef` is True (default), rebinding while unused will be
+          reported.
+        """
+        redefinedWhileUnused = False
+        if not isinstance(self.scope, ClassScope):
+            for scope in self.scopeStack[::-1]:
+                existing = scope.get(value.name)
+                if (isinstance(existing, Importation)
+                        and not existing.used
+                        and (not isinstance(value, Importation) or
+                             value.fullName == existing.fullName)
+                        and reportRedef
+                        and not self.differentForks(node, existing.source)):
+                    redefinedWhileUnused = True
+                    self.report(messages.RedefinedWhileUnused,
+                                node, value.name, existing.source)
+
+        existing = self.scope.get(value.name)
+        if not redefinedWhileUnused and self.hasParent(value.source, ast.ListComp):
+            if (existing and reportRedef
+                    and not self.hasParent(existing.source, (ast.For, ast.ListComp))
+                    and not self.differentForks(node, existing.source)):
+                self.report(messages.RedefinedInListComp,
+                            node, value.name, existing.source)
+
+        if (isinstance(existing, Definition)
+                and not existing.used
+                and not self.differentForks(node, existing.source)):
+            self.report(messages.RedefinedWhileUnused,
+                        node, value.name, existing.source)
+        else:
+            self.scope[value.name] = value
+
+    def getNodeHandler(self, node_class):
+        try:
+            return self._nodeHandlers[node_class]
+        except KeyError:
+            nodeType = getNodeType(node_class)
+        self._nodeHandlers[node_class] = handler = getattr(self, nodeType)
+        return handler
+
+    def handleNodeLoad(self, node):
+        name = getNodeName(node)
+        if not name:
+            return
+        # try local scope
+        try:
+            self.scope[name].used = (self.scope, node)
+        except KeyError:
+            pass
+        else:
+            return
+
+        scopes = [scope for scope in self.scopeStack[:-1]
+                  if isinstance(scope, (FunctionScope, ModuleScope))]
+        if isinstance(self.scope, GeneratorScope) and scopes[-1] != self.scopeStack[-2]:
+            scopes.append(self.scopeStack[-2])
+
+        # try enclosing function scopes and global scope
+        importStarred = self.scope.importStarred
+        for scope in reversed(scopes):
+            importStarred = importStarred or scope.importStarred
+            try:
+                scope[name].used = (self.scope, node)
+            except KeyError:
+                pass
+            else:
+                return
+
+        # look in the built-ins
+        if importStarred or name in self.builtIns:
+            return
+        if name == '__path__' and os.path.basename(self.filename) == '__init__.py':
+            # the special name __path__ is valid only in packages
+            return
+
+        # protected with a NameError handler?
+        if 'NameError' not in self.exceptHandlers[-1]:
+            self.report(messages.UndefinedName, node, name)
+
+    def handleNodeStore(self, node):
+        name = getNodeName(node)
+        if not name:
+            return
+        # if the name hasn't already been defined in the current scope
+        if isinstance(self.scope, FunctionScope) and name not in self.scope:
+            # for each function or module scope above us
+            for scope in self.scopeStack[:-1]:
+                if not isinstance(scope, (FunctionScope, ModuleScope)):
+                    continue
+                # if the name was defined in that scope, and the name has
+                # been accessed already in the current scope, and hasn't
+                # been declared global
+                used = name in scope and scope[name].used
+                if used and used[0] is self.scope and name not in self.scope.globals:
+                    # then it's probably a mistake
+                    self.report(messages.UndefinedLocal,
+                                scope[name].used[1], name, scope[name].source)
+                    break
+
+        parent = getattr(node, 'parent', None)
+        if isinstance(parent, (ast.For, ast.comprehension, ast.Tuple, ast.List)):
+            binding = Binding(name, node)
+        elif (parent is not None and name == '__all__' and
+              isinstance(self.scope, ModuleScope)):
+            binding = ExportBinding(name, parent.value)
+        else:
+            binding = Assignment(name, node)
+        if name in self.scope:
+            binding.used = self.scope[name].used
+        self.addBinding(node, binding)
+
+    def handleNodeDelete(self, node):
+        name = getNodeName(node)
+        if not name:
+            return
+        if isinstance(self.scope, FunctionScope) and name in self.scope.globals:
+            self.scope.globals.remove(name)
+        else:
+            try:
+                del self.scope[name]
+            except KeyError:
+                self.report(messages.UndefinedName, node, name)
+
+    def handleChildren(self, tree):
+        for node in iter_child_nodes(tree):
+            self.handleNode(node, tree)
+
+    def isDocstring(self, node):
+        """
+        Determine if the given node is a docstring, as long as it is at the
+        correct place in the node tree.
+        """
+        return isinstance(node, ast.Str) or (isinstance(node, ast.Expr) and
+                                             isinstance(node.value, ast.Str))
+
+    def getDocstring(self, node):
+        if isinstance(node, ast.Expr):
+            node = node.value
+        if not isinstance(node, ast.Str):
+            return (None, None)
+        # Computed incorrectly if the docstring has backslash
+        doctest_lineno = node.lineno - node.s.count('\n') - 1
+        return (node.s, doctest_lineno)
+
+    def handleNode(self, node, parent):
+        if node is None:
+            return
+        if self.offset and getattr(node, 'lineno', None) is not None:
+            node.lineno += self.offset[0]
+            node.col_offset += self.offset[1]
+        if self.traceTree:
+            print('  ' * self.nodeDepth + node.__class__.__name__)
+        if self.futuresAllowed and not (isinstance(node, ast.ImportFrom) or
+                                        self.isDocstring(node)):
+            self.futuresAllowed = False
+        self.nodeDepth += 1
+        node.level = self.nodeDepth
+        node.parent = parent
+        try:
+            handler = self.getNodeHandler(node.__class__)
+            handler(node)
+        finally:
+            self.nodeDepth -= 1
+        if self.traceTree:
+            print('  ' * self.nodeDepth + 'end ' + node.__class__.__name__)
+
+    _getDoctestExamples = doctest.DocTestParser().get_examples
+
+    def handleDoctests(self, node):
+        try:
+            docstring, node_lineno = self.getDocstring(node.body[0])
+            if not docstring:
+                return
+            examples = self._getDoctestExamples(docstring)
+        except (ValueError, IndexError):
+            # e.g. line 6 of the docstring for <string> has inconsistent
+            # leading whitespace: ...
+            return
+        node_offset = self.offset or (0, 0)
+        self.pushScope()
+        for example in examples:
+            try:
+                tree = compile(example.source, "<doctest>", "exec", ast.PyCF_ONLY_AST)
+            except SyntaxError:
+                e = sys.exc_info()[1]
+                position = (node_lineno + example.lineno + e.lineno,
+                            example.indent + 4 + e.offset)
+                self.report(messages.DoctestSyntaxError, node, position)
+            else:
+                self.offset = (node_offset[0] + node_lineno + example.lineno,
+                               node_offset[1] + example.indent + 4)
+                self.handleChildren(tree)
+                self.offset = node_offset
+        self.popScope()
+
+    def ignore(self, node):
+        pass
+
+    # "stmt" type nodes
+    RETURN = DELETE = PRINT = WHILE = IF = WITH = WITHITEM = RAISE = \
+        TRYFINALLY = ASSERT = EXEC = EXPR = handleChildren
+
+    CONTINUE = BREAK = PASS = ignore
+
+    # "expr" type nodes
+    BOOLOP = BINOP = UNARYOP = IFEXP = DICT = SET = YIELD = YIELDFROM = \
+        COMPARE = CALL = REPR = ATTRIBUTE = SUBSCRIPT = LIST = TUPLE = \
+        STARRED = handleChildren
+
+    NUM = STR = BYTES = ELLIPSIS = ignore
+
+    # "slice" type nodes
+    SLICE = EXTSLICE = INDEX = handleChildren
+
+    # expression contexts are node instances too, though being constants
+    LOAD = STORE = DEL = AUGLOAD = AUGSTORE = PARAM = ignore
+
+    # same for operators
+    AND = OR = ADD = SUB = MULT = DIV = MOD = POW = LSHIFT = RSHIFT = \
+        BITOR = BITXOR = BITAND = FLOORDIV = INVERT = NOT = UADD = USUB = \
+        EQ = NOTEQ = LT = LTE = GT = GTE = IS = ISNOT = IN = NOTIN = ignore
+
+    # additional node types
+    COMPREHENSION = KEYWORD = handleChildren
+
+    def GLOBAL(self, node):
+        """
+        Keep track of globals declarations.
+        """
+        if isinstance(self.scope, FunctionScope):
+            self.scope.globals.update(node.names)
+
+    NONLOCAL = GLOBAL
+
+    def LISTCOMP(self, node):
+        # handle generators before element
+        for gen in node.generators:
+            self.handleNode(gen, node)
+        self.handleNode(node.elt, node)
+
+    def GENERATOREXP(self, node):
+        self.pushScope(GeneratorScope)
+        # handle generators before element
+        for gen in node.generators:
+            self.handleNode(gen, node)
+        self.handleNode(node.elt, node)
+        self.popScope()
+
+    SETCOMP = GENERATOREXP
+
+    def DICTCOMP(self, node):
+        self.pushScope(GeneratorScope)
+        for gen in node.generators:
+            self.handleNode(gen, node)
+        self.handleNode(node.key, node)
+        self.handleNode(node.value, node)
+        self.popScope()
+
+    def FOR(self, node):
+        """
+        Process bindings for loop variables.
+        """
+        vars = []
+
+        def collectLoopVars(n):
+            if isinstance(n, ast.Name):
+                vars.append(n.id)
+            elif isinstance(n, ast.expr_context):
+                return
+            else:
+                for c in iter_child_nodes(n):
+                    collectLoopVars(c)
+
+        collectLoopVars(node.target)
+        for varn in vars:
+            if (isinstance(self.scope.get(varn), Importation)
+                    # unused ones will get an unused import warning
+                    and self.scope[varn].used):
+                self.report(messages.ImportShadowedByLoopVar,
+                            node, varn, self.scope[varn].source)
+
+        self.handleChildren(node)
+
+    def NAME(self, node):
+        """
+        Handle occurrence of Name (which can be a load/store/delete access.)
+        """
+        # Locate the name in locals / function / globals scopes.
+        if isinstance(node.ctx, (ast.Load, ast.AugLoad)):
+            self.handleNodeLoad(node)
+            if (node.id == 'locals' and isinstance(self.scope, FunctionScope)
+                    and isinstance(node.parent, ast.Call)):
+                # we are doing locals() call in current scope
+                self.scope.usesLocals = True
+        elif isinstance(node.ctx, (ast.Store, ast.AugStore)):
+            self.handleNodeStore(node)
+        elif isinstance(node.ctx, ast.Del):
+            self.handleNodeDelete(node)
+        else:
+            # must be a Param context -- this only happens for names in function
+            # arguments, but these aren't dispatched through here
+            raise RuntimeError("Got impossible expression context: %r" % (node.ctx,))
+
+    def FUNCTIONDEF(self, node):
+        for deco in node.decorator_list:
+            self.handleNode(deco, node)
+        self.addBinding(node, FunctionDefinition(node.name, node))
+        self.LAMBDA(node)
+        if self.withDoctest:
+            self.deferFunction(lambda: self.handleDoctests(node))
+
+    def LAMBDA(self, node):
+        args = []
+
+        if PY2:
+            def addArgs(arglist):
+                for arg in arglist:
+                    if isinstance(arg, ast.Tuple):
+                        addArgs(arg.elts)
+                    else:
+                        if arg.id in args:
+                            self.report(messages.DuplicateArgument,
+                                        node, arg.id)
+                        args.append(arg.id)
+            addArgs(node.args.args)
+            defaults = node.args.defaults
+        else:
+            for arg in node.args.args + node.args.kwonlyargs:
+                if arg.arg in args:
+                    self.report(messages.DuplicateArgument,
+                                node, arg.arg)
+                args.append(arg.arg)
+                self.handleNode(arg.annotation, node)
+            if hasattr(node, 'returns'):    # Only for FunctionDefs
+                for annotation in (node.args.varargannotation,
+                                   node.args.kwargannotation, node.returns):
+                    self.handleNode(annotation, node)
+            defaults = node.args.defaults + node.args.kw_defaults
+
+        # vararg/kwarg identifiers are not Name nodes
+        for wildcard in (node.args.vararg, node.args.kwarg):
+            if not wildcard:
+                continue
+            if wildcard in args:
+                self.report(messages.DuplicateArgument, node, wildcard)
+            args.append(wildcard)
+        for default in defaults:
+            self.handleNode(default, node)
+
+        def runFunction():
+
+            self.pushScope()
+            for name in args:
+                self.addBinding(node, Argument(name, node), reportRedef=False)
+            if isinstance(node.body, list):
+                # case for FunctionDefs
+                for stmt in node.body:
+                    self.handleNode(stmt, node)
+            else:
+                # case for Lambdas
+                self.handleNode(node.body, node)
+
+            def checkUnusedAssignments():
+                """
+                Check to see if any assignments have not been used.
+                """
+                for name, binding in self.scope.unusedAssignments():
+                    self.report(messages.UnusedVariable, binding.source, name)
+            self.deferAssignment(checkUnusedAssignments)
+            self.popScope()
+
+        self.deferFunction(runFunction)
+
+    def CLASSDEF(self, node):
+        """
+        Check names used in a class definition, including its decorators, base
+        classes, and the body of its definition.  Additionally, add its name to
+        the current scope.
+        """
+        for deco in node.decorator_list:
+            self.handleNode(deco, node)
+        for baseNode in node.bases:
+            self.handleNode(baseNode, node)
+        if not PY2:
+            for keywordNode in node.keywords:
+                self.handleNode(keywordNode, node)
+        self.pushScope(ClassScope)
+        if self.withDoctest:
+            self.deferFunction(lambda: self.handleDoctests(node))
+        for stmt in node.body:
+            self.handleNode(stmt, node)
+        self.popScope()
+        self.addBinding(node, ClassDefinition(node.name, node))
+
+    def ASSIGN(self, node):
+        self.handleNode(node.value, node)
+        for target in node.targets:
+            self.handleNode(target, node)
+
+    def AUGASSIGN(self, node):
+        self.handleNodeLoad(node.target)
+        self.handleNode(node.value, node)
+        self.handleNode(node.target, node)
+
+    def IMPORT(self, node):
+        for alias in node.names:
+            name = alias.asname or alias.name
+            importation = Importation(name, node)
+            self.addBinding(node, importation)
+
+    def IMPORTFROM(self, node):
+        if node.module == '__future__':
+            if not self.futuresAllowed:
+                self.report(messages.LateFutureImport,
+                            node, [n.name for n in node.names])
+        else:
+            self.futuresAllowed = False
+
+        for alias in node.names:
+            if alias.name == '*':
+                self.scope.importStarred = True
+                self.report(messages.ImportStarUsed, node, node.module)
+                continue
+            name = alias.asname or alias.name
+            importation = Importation(name, node)
+            if node.module == '__future__':
+                importation.used = (self.scope, node)
+            self.addBinding(node, importation)
+
+    def TRY(self, node):
+        handler_names = []
+        # List the exception handlers
+        for handler in node.handlers:
+            if isinstance(handler.type, ast.Tuple):
+                for exc_type in handler.type.elts:
+                    handler_names.append(getNodeName(exc_type))
+            elif handler.type:
+                handler_names.append(getNodeName(handler.type))
+        # Memorize the except handlers and process the body
+        self.exceptHandlers.append(handler_names)
+        for child in node.body:
+            self.handleNode(child, node)
+        self.exceptHandlers.pop()
+        # Process the other nodes: "except:", "else:", "finally:"
+        for child in iter_child_nodes(node):
+            if child not in node.body:
+                self.handleNode(child, node)
+
+    TRYEXCEPT = TRY
+
+    def EXCEPTHANDLER(self, node):
+        # 3.x: in addition to handling children, we must handle the name of
+        # the exception, which is not a Name node, but a simple string.
+        if isinstance(node.name, str):
+            self.handleNodeStore(node)
+        self.handleChildren(node)

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