pylint: upgrade to 1.3.1

third_party/logilab/astng/rebuilder.py

-# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
-# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
-# copyright 2003-2010 Sylvain Thenault, all rights reserved.
-# contact mailto:thenault@gmail.com
-#
-# This file is part of logilab-astng.
-#
-# logilab-astng is free software: you can redistribute it and/or modify it
-# under the terms of the GNU Lesser General Public License as published by the
-# Free Software Foundation, either version 2.1 of the License, or (at your
-# option) any later version.
-#
-# logilab-astng 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 Lesser General Public License
-# for more details.
-#
-# You should have received a copy of the GNU Lesser General Public License along
-# with logilab-astng. If not, see <http://www.gnu.org/licenses/>.
-"""this module contains utilities for rebuilding a _ast tree in
-order to get a single ASTNG representation
-"""
-
-import sys
-from _ast import (Expr as Discard, Str,
-    # binary operators
-    Add, Div, FloorDiv,  Mod, Mult, Pow, Sub, BitAnd, BitOr, BitXor,
-    LShift, RShift,
-    # logical operators
-    And, Or,
-    # unary operators
-    UAdd, USub, Not, Invert,
-    # comparison operators
-    Eq, Gt, GtE, In, Is, IsNot, Lt, LtE, NotEq, NotIn,
-    )
-
-from logilab.astng.exceptions import ASTNGBuildingException
-from logilab.astng import nodes as new
-
-
-_BIN_OP_CLASSES = {Add: '+',
-                   BitAnd: '&',
-                   BitOr: '|',
-                   BitXor: '^',
-                   Div: '/',
-                   FloorDiv: '//',
-                   Mod: '%',
-                   Mult: '*',
-                   Pow: '**',
-                   Sub: '-',
-                   LShift: '<<',
-                   RShift: '>>'}
-
-_BOOL_OP_CLASSES = {And: 'and',
-                    Or: 'or'}
-
-_UNARY_OP_CLASSES = {UAdd: '+',
-                     USub: '-',
-                     Not: 'not',
-                     Invert: '~'}
-
-_CMP_OP_CLASSES = {Eq: '==',
-                   Gt: '>',
-                   GtE: '>=',
-                   In: 'in',
-                   Is: 'is',
-                   IsNot: 'is not',
-                   Lt: '<',
-                   LtE: '<=',
-                   NotEq: '!=',
-                   NotIn: 'not in'}
-
-CONST_NAME_TRANSFORMS = {'None':  None,
-                         'True':  True,
-                         'False': False}
-
-REDIRECT = {'arguments': 'Arguments',
-            'Attribute': 'Getattr',
-            'comprehension': 'Comprehension',
-            'Call': 'CallFunc',
-            'ClassDef': 'Class',
-            "ListCompFor": 'Comprehension',
-            "GenExprFor": 'Comprehension',
-            'excepthandler': 'ExceptHandler',
-            'Expr': 'Discard',
-            'FunctionDef': 'Function',
-            'GeneratorExp': 'GenExpr',
-            'ImportFrom': 'From',
-            'keyword': 'Keyword',
-            'Repr': 'Backquote',
-            }
-
-def _init_set_doc(node, newnode):
-    newnode.doc = None
-    try:
-        if isinstance(node.body[0], Discard) and isinstance(node.body[0].value, Str):
-            newnode.tolineno = node.body[0].lineno
-            newnode.doc = node.body[0].value.s
-            node.body = node.body[1:]
-
-    except IndexError:
-        pass # ast built from scratch
-
-def _lineno_parent(oldnode, newnode, parent):
-    newnode.parent = parent
-    if hasattr(oldnode, 'lineno'):
-        newnode.lineno = oldnode.lineno
-    if hasattr(oldnode, 'col_offset'):
-        newnode.col_offset = oldnode.col_offset
-
-def _set_infos(oldnode, newnode, parent):
-    newnode.parent = parent
-    if hasattr(oldnode, 'lineno'):
-        newnode.lineno = oldnode.lineno
-    if hasattr(oldnode, 'col_offset'):
-        newnode.col_offset = oldnode.col_offset
-    newnode.set_line_info(newnode.last_child()) # set_line_info accepts None
-
-
-
-
-class TreeRebuilder(object):
-    """Rebuilds the _ast tree to become an ASTNG tree"""
-
-    _visit_meths = {}
-    def __init__(self):
-        self.init()
-
-    def init(self):
-        self.asscontext = None
-        self._metaclass = ['']
-        self._global_names = []
-        self._from_nodes = []
-        self._delayed_assattr = []
-
-    def visit(self, node, parent):
-        cls = node.__class__
-        if cls in self._visit_meths:
-            return self._visit_meths[cls](node, parent)
-        else:
-            cls_name = cls.__name__
-            visit_name = 'visit_' + REDIRECT.get(cls_name, cls_name).lower()
-            visit_method = getattr(self, visit_name)
-            self._visit_meths[cls] = visit_method
-            return visit_method(node, parent)
-
-    def _save_assignment(self, node, name=None):
-        """save assignement situation since node.parent is not available yet"""
-        if self._global_names and node.name in self._global_names[-1]:
-            node.root().set_local(node.name, node)
-        else:
-            node.parent.set_local(node.name, node)
-
-
-    def visit_arguments(self, node, parent):
-        """visit a Arguments node by returning a fresh instance of it"""
-        newnode = new.Arguments()
-        _lineno_parent(node, newnode, parent)
-        self.asscontext = "Ass"
-        newnode.args = [self.visit(child, newnode) for child in node.args]
-        self.asscontext = None
-        newnode.defaults = [self.visit(child, newnode) for child in node.defaults]
-        newnode.vararg = node.vararg
-        newnode.kwarg = node.kwarg
-        # save argument names in locals:
-        if node.vararg:
-            newnode.parent.set_local(newnode.vararg, newnode)
-        if node.kwarg:
-            newnode.parent.set_local(newnode.kwarg, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_assattr(self, node, parent):
-        """visit a AssAttr node by returning a fresh instance of it"""
-        assc, self.asscontext = self.asscontext, None
-        newnode = new.AssAttr()
-        _lineno_parent(node, newnode, parent)
-        newnode.expr = self.visit(node.expr, newnode)
-        self.asscontext = assc
-        self._delayed_assattr.append(newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_assert(self, node, parent):
-        """visit a Assert node by returning a fresh instance of it"""
-        newnode = new.Assert()
-        _lineno_parent(node, newnode, parent)
-        newnode.test = self.visit(node.test, newnode)
-        if node.msg is not None:
-            newnode.fail = self.visit(node.msg, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_assign(self, node, parent):
-        """visit a Assign node by returning a fresh instance of it"""
-        newnode = new.Assign()
-        _lineno_parent(node, newnode, parent)
-        self.asscontext = "Ass"
-        newnode.targets = [self.visit(child, newnode) for child in node.targets]
-        self.asscontext = None
-        newnode.value = self.visit(node.value, newnode)
-        # set some function or metaclass infos  XXX explain ?
-        klass = newnode.parent.frame()
-        if (isinstance(klass, new.Class)
-            and isinstance(newnode.value, new.CallFunc)
-            and isinstance(newnode.value.func, new.Name)):
-            func_name = newnode.value.func.name
-            for ass_node in newnode.targets:
-                try:
-                    meth = klass[ass_node.name]
-                    if isinstance(meth, new.Function):
-                        if func_name in ('classmethod', 'staticmethod'):
-                            meth.type = func_name
-                        elif func_name == 'classproperty': # see lgc.decorators
-                            meth.type = 'classmethod'
-                        meth.extra_decorators.append(newnode.value)
-                except (AttributeError, KeyError):
-                    continue
-        elif getattr(newnode.targets[0], 'name', None) == '__metaclass__':
-            # XXX check more...
-            self._metaclass[-1] = 'type' # XXX get the actual metaclass
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_assname(self, node, parent, node_name=None):
-        '''visit a node and return a AssName node'''
-        newnode = new.AssName()
-        _set_infos(node, newnode, parent)
-        newnode.name = node_name
-        self._save_assignment(newnode)
-        return newnode
-
-    def visit_augassign(self, node, parent):
-        """visit a AugAssign node by returning a fresh instance of it"""
-        newnode = new.AugAssign()
-        _lineno_parent(node, newnode, parent)
-        newnode.op = _BIN_OP_CLASSES[node.op.__class__] + "="
-        self.asscontext = "Ass"
-        newnode.target = self.visit(node.target, newnode)
-        self.asscontext = None
-        newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_backquote(self, node, parent):
-        """visit a Backquote node by returning a fresh instance of it"""
-        newnode = new.Backquote()
-        _lineno_parent(node, newnode, parent)
-        newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_binop(self, node, parent):
-        """visit a BinOp node by returning a fresh instance of it"""
-        newnode = new.BinOp()
-        _lineno_parent(node, newnode, parent)
-        newnode.left = self.visit(node.left, newnode)
-        newnode.right = self.visit(node.right, newnode)
-        newnode.op = _BIN_OP_CLASSES[node.op.__class__]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_boolop(self, node, parent):
-        """visit a BoolOp node by returning a fresh instance of it"""
-        newnode = new.BoolOp()
-        _lineno_parent(node, newnode, parent)
-        newnode.values = [self.visit(child, newnode) for child in node.values]
-        newnode.op = _BOOL_OP_CLASSES[node.op.__class__]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_break(self, node, parent):
-        """visit a Break node by returning a fresh instance of it"""
-        newnode = new.Break()
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_callfunc(self, node, parent):
-        """visit a CallFunc node by returning a fresh instance of it"""
-        newnode = new.CallFunc()
-        _lineno_parent(node, newnode, parent)
-        newnode.func = self.visit(node.func, newnode)
-        newnode.args = [self.visit(child, newnode) for child in node.args]
-        if node.starargs is not None:
-            newnode.starargs = self.visit(node.starargs, newnode)
-        if node.kwargs is not None:
-            newnode.kwargs = self.visit(node.kwargs, newnode)
-        newnode.args.extend(self.visit(child, newnode) for child in node.keywords)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_class(self, node, parent):
-        """visit a Class node to become astng"""
-        self._metaclass.append(self._metaclass[-1])
-        newnode = new.Class(node.name, None)
-        _lineno_parent(node, newnode, parent)
-        _init_set_doc(node, newnode)
-        newnode.bases = [self.visit(child, newnode) for child in node.bases]
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        if 'decorator_list' in node._fields and node.decorator_list:# py >= 2.6
-            newnode.decorators = self.visit_decorators(node, newnode)
-        newnode.set_line_info(newnode.last_child())
-        metaclass = self._metaclass.pop()
-        if not newnode.bases:
-            # no base classes, detect new / style old style according to
-            # current scope
-            newnode._newstyle = metaclass == 'type'
-        newnode.parent.frame().set_local(newnode.name, newnode)
-        return newnode
-
-    def visit_const(self, node, parent):
-        """visit a Const node by returning a fresh instance of it"""
-        newnode = new.Const(node.value)
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_continue(self, node, parent):
-        """visit a Continue node by returning a fresh instance of it"""
-        newnode = new.Continue()
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_compare(self, node, parent):
-        """visit a Compare node by returning a fresh instance of it"""
-        newnode = new.Compare()
-        _lineno_parent(node, newnode, parent)
-        newnode.left = self.visit(node.left, newnode)
-        newnode.ops = [(_CMP_OP_CLASSES[op.__class__], self.visit(expr, newnode))
-                    for (op, expr) in zip(node.ops, node.comparators)]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_comprehension(self, node, parent):
-        """visit a Comprehension node by returning a fresh instance of it"""
-        newnode = new.Comprehension()
-        _lineno_parent(node, newnode, parent)
-        self.asscontext = "Ass"
-        newnode.target = self.visit(node.target, newnode)
-        self.asscontext = None
-        newnode.iter = self.visit(node.iter, newnode)
-        newnode.ifs = [self.visit(child, newnode) for child in node.ifs]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_decorators(self, node, parent):
-        """visit a Decorators node by returning a fresh instance of it"""
-        # /!\ node is actually a _ast.Function node while
-        # parent is a astng.nodes.Function node
-        newnode = new.Decorators()
-        _lineno_parent(node, newnode, parent)
-        if 'decorators' in node._fields: # py < 2.6, i.e. 2.5
-            decorators = node.decorators
-        else:
-            decorators= node.decorator_list
-        newnode.nodes = [self.visit(child, newnode) for child in decorators]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_delete(self, node, parent):
-        """visit a Delete node by returning a fresh instance of it"""
-        newnode = new.Delete()
-        _lineno_parent(node, newnode, parent)
-        self.asscontext = "Del"
-        newnode.targets = [self.visit(child, newnode) for child in node.targets]
-        self.asscontext = None
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_dict(self, node, parent):
-        """visit a Dict node by returning a fresh instance of it"""
-        newnode = new.Dict()
-        _lineno_parent(node, newnode, parent)
-        newnode.items = [(self.visit(key, newnode), self.visit(value, newnode))
-                          for key, value in zip(node.keys, node.values)]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_dictcomp(self, node, parent):
-        """visit a DictComp node by returning a fresh instance of it"""
-        newnode = new.DictComp()
-        _lineno_parent(node, newnode, parent)
-        newnode.key = self.visit(node.key, newnode)
-        newnode.value = self.visit(node.value, newnode)
-        newnode.generators = [self.visit(child, newnode)
-                              for child in node.generators]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_discard(self, node, parent):
-        """visit a Discard node by returning a fresh instance of it"""
-        newnode = new.Discard()
-        _lineno_parent(node, newnode, parent)
-        newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_ellipsis(self, node, parent):
-        """visit an Ellipsis node by returning a fresh instance of it"""
-        newnode = new.Ellipsis()
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_emptynode(self, node, parent):
-        """visit an EmptyNode node by returning a fresh instance of it"""
-        newnode = new.EmptyNode()
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_excepthandler(self, node, parent):
-        """visit an ExceptHandler node by returning a fresh instance of it"""
-        newnode = new.ExceptHandler()
-        _lineno_parent(node, newnode, parent)
-        if node.type is not None:
-            newnode.type = self.visit(node.type, newnode)
-        if node.name is not None:
-            # /!\ node.name can be a tuple
-            self.asscontext = "Ass"
-            newnode.name = self.visit(node.name, newnode)
-            self.asscontext = None
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_exec(self, node, parent):
-        """visit an Exec node by returning a fresh instance of it"""
-        newnode = new.Exec()
-        _lineno_parent(node, newnode, parent)
-        newnode.expr = self.visit(node.body, newnode)
-        if node.globals is not None:
-            newnode.globals = self.visit(node.globals, newnode)
-        if node.locals is not None:
-            newnode.locals = self.visit(node.locals, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_extslice(self, node, parent):
-        """visit an ExtSlice node by returning a fresh instance of it"""
-        newnode = new.ExtSlice()
-        _lineno_parent(node, newnode, parent)
-        newnode.dims = [self.visit(dim, newnode) for dim in node.dims]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_for(self, node, parent):
-        """visit a For node by returning a fresh instance of it"""
-        newnode = new.For()
-        _lineno_parent(node, newnode, parent)
-        self.asscontext = "Ass"
-        newnode.target = self.visit(node.target, newnode)
-        self.asscontext = None
-        newnode.iter = self.visit(node.iter, newnode)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.orelse = [self.visit(child, newnode) for child in node.orelse]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_from(self, node, parent):
-        """visit a From node by returning a fresh instance of it"""
-        names = [(alias.name, alias.asname) for alias in node.names]
-        newnode = new.From(node.module or '', names, node.level)
-        _set_infos(node, newnode, parent)
-        # store From names to add them to locals after building
-        self._from_nodes.append(newnode)
-        return newnode
-
-    def visit_function(self, node, parent):
-        """visit an Function node to become astng"""
-        self._global_names.append({})
-        newnode = new.Function(node.name, None)
-        _lineno_parent(node, newnode, parent)
-        _init_set_doc(node, newnode)
-        newnode.args = self.visit(node.args, newnode)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        if 'decorators' in node._fields: # py < 2.6
-            attr = 'decorators'
-        else:
-            attr = 'decorator_list'
-        decorators = getattr(node, attr)
-        if decorators:
-            newnode.decorators = self.visit_decorators(node, newnode)
-        newnode.set_line_info(newnode.last_child())
-        self._global_names.pop()
-        frame = newnode.parent.frame()
-        if isinstance(frame, new.Class):
-            if newnode.name == '__new__':
-                newnode.type = 'classmethod'
-            else:
-                newnode.type = 'method'
-        if newnode.decorators is not None:
-            for decorator_expr in newnode.decorators.nodes:
-                if isinstance(decorator_expr, new.Name):
-                    if decorator_expr.name in ('classmethod', 'staticmethod'):
-                        newnode.type = decorator_expr.name
-                    elif decorator_expr.name == 'classproperty':
-                        newnode.type = 'classmethod'
-        frame.set_local(newnode.name, newnode)
-        return newnode
-
-    def visit_genexpr(self, node, parent):
-        """visit a GenExpr node by returning a fresh instance of it"""
-        newnode = new.GenExpr()
-        _lineno_parent(node, newnode, parent)
-        newnode.elt = self.visit(node.elt, newnode)
-        newnode.generators = [self.visit(child, newnode) for child in node.generators]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_getattr(self, node, parent):
-        """visit a Getattr node by returning a fresh instance of it"""
-        if self.asscontext == "Del":
-            # FIXME : maybe we should reintroduce and visit_delattr ?
-            # for instance, deactivating asscontext
-            newnode = new.DelAttr()
-        elif self.asscontext == "Ass":
-            # FIXME : maybe we should call visit_assattr ?
-            newnode = new.AssAttr()
-            self._delayed_assattr.append(newnode)
-        else:
-            newnode = new.Getattr()
-        _lineno_parent(node, newnode, parent)
-        asscontext, self.asscontext = self.asscontext, None
-        newnode.expr = self.visit(node.value, newnode)
-        self.asscontext = asscontext
-        newnode.attrname = node.attr
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_global(self, node, parent):
-        """visit an Global node to become astng"""
-        newnode = new.Global(node.names)
-        _set_infos(node, newnode, parent)
-        if self._global_names: # global at the module level, no effect
-            for name in node.names:
-                self._global_names[-1].setdefault(name, []).append(newnode)
-        return newnode
-
-    def visit_if(self, node, parent):
-        """visit a If node by returning a fresh instance of it"""
-        newnode = new.If()
-        _lineno_parent(node, newnode, parent)
-        newnode.test = self.visit(node.test, newnode)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.orelse = [self.visit(child, newnode) for child in node.orelse]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_ifexp(self, node, parent):
-        """visit a IfExp node by returning a fresh instance of it"""
-        newnode = new.IfExp()
-        _lineno_parent(node, newnode, parent)
-        newnode.test = self.visit(node.test, newnode)
-        newnode.body = self.visit(node.body, newnode)
-        newnode.orelse = self.visit(node.orelse, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_import(self, node, parent):
-        """visit a Import node by returning a fresh instance of it"""
-        newnode = new.Import()
-        _set_infos(node, newnode, parent)
-        newnode.names = [(alias.name, alias.asname) for alias in node.names]
-        # save import names in parent's locals:
-        for (name, asname) in newnode.names:
-            name = asname or name
-            newnode.parent.set_local(name.split('.')[0], newnode)
-        return newnode
-
-    def visit_index(self, node, parent):
-        """visit a Index node by returning a fresh instance of it"""
-        newnode = new.Index()
-        _lineno_parent(node, newnode, parent)
-        newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_keyword(self, node, parent):
-        """visit a Keyword node by returning a fresh instance of it"""
-        newnode = new.Keyword()
-        _lineno_parent(node, newnode, parent)
-        newnode.arg = node.arg
-        newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_lambda(self, node, parent):
-        """visit a Lambda node by returning a fresh instance of it"""
-        newnode = new.Lambda()
-        _lineno_parent(node, newnode, parent)
-        newnode.args = self.visit(node.args, newnode)
-        newnode.body = self.visit(node.body, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_list(self, node, parent):
-        """visit a List node by returning a fresh instance of it"""
-        newnode = new.List()
-        _lineno_parent(node, newnode, parent)
-        newnode.elts = [self.visit(child, newnode) for child in node.elts]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_listcomp(self, node, parent):
-        """visit a ListComp node by returning a fresh instance of it"""
-        newnode = new.ListComp()
-        _lineno_parent(node, newnode, parent)
-        newnode.elt = self.visit(node.elt, newnode)
-        newnode.generators = [self.visit(child, newnode)
-                              for child in node.generators]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_module(self, node, modname, package):
-        """visit a Module node by returning a fresh instance of it"""
-        newnode = new.Module(modname, None)
-        newnode.package = package
-        _lineno_parent(node, newnode, parent=None)
-        _init_set_doc(node, newnode)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_name(self, node, parent):
-        """visit a Name node by returning a fresh instance of it"""
-        # True and False can be assigned to something in py2x, so we have to
-        # check first the asscontext
-        if self.asscontext == "Del":
-            newnode = new.DelName()
-        elif self.asscontext is not None: # Ass
-            assert self.asscontext == "Ass"
-            newnode = new.AssName()
-        elif node.id in CONST_NAME_TRANSFORMS:
-            newnode = new.Const(CONST_NAME_TRANSFORMS[node.id])
-            _set_infos(node, newnode, parent)
-            return newnode
-        else:
-            newnode = new.Name()
-        _lineno_parent(node, newnode, parent)
-        newnode.name = node.id
-        # XXX REMOVE me :
-        if self.asscontext in ('Del', 'Ass'): # 'Aug' ??
-            self._save_assignment(newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_bytes(self, node, parent):
-        """visit a Bytes node by returning a fresh instance of Const"""
-        newnode = new.Const(node.s)
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_num(self, node, parent):
-        """visit a Num node by returning a fresh instance of Const"""
-        newnode = new.Const(node.n)
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_pass(self, node, parent):
-        """visit a Pass node by returning a fresh instance of it"""
-        newnode = new.Pass()
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_str(self, node, parent):
-        """visit a Str node by returning a fresh instance of Const"""
-        newnode = new.Const(node.s)
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_print(self, node, parent):
-        """visit a Print node by returning a fresh instance of it"""
-        newnode = new.Print()
-        _lineno_parent(node, newnode, parent)
-        newnode.nl = node.nl
-        if node.dest is not None:
-            newnode.dest = self.visit(node.dest, newnode)
-        newnode.values = [self.visit(child, newnode) for child in node.values]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_raise(self, node, parent):
-        """visit a Raise node by returning a fresh instance of it"""
-        newnode = new.Raise()
-        _lineno_parent(node, newnode, parent)
-        if node.type is not None:
-            newnode.exc = self.visit(node.type, newnode)
-        if node.inst is not None:
-            newnode.inst = self.visit(node.inst, newnode)
-        if node.tback is not None:
-            newnode.tback = self.visit(node.tback, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_return(self, node, parent):
-        """visit a Return node by returning a fresh instance of it"""
-        newnode = new.Return()
-        _lineno_parent(node, newnode, parent)
-        if node.value is not None:
-            newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_set(self, node, parent):
-        """visit a Tuple node by returning a fresh instance of it"""
-        newnode = new.Set()
-        _lineno_parent(node, newnode, parent)
-        newnode.elts = [self.visit(child, newnode) for child in node.elts]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_setcomp(self, node, parent):
-        """visit a SetComp node by returning a fresh instance of it"""
-        newnode = new.SetComp()
-        _lineno_parent(node, newnode, parent)
-        newnode.elt = self.visit(node.elt, newnode)
-        newnode.generators = [self.visit(child, newnode)
-                              for child in node.generators]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_slice(self, node, parent):
-        """visit a Slice node by returning a fresh instance of it"""
-        newnode = new.Slice()
-        _lineno_parent(node, newnode, parent)
-        if node.lower is not None:
-            newnode.lower = self.visit(node.lower, newnode)
-        if node.upper is not None:
-            newnode.upper = self.visit(node.upper, newnode)
-        if node.step is not None:
-            newnode.step = self.visit(node.step, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_subscript(self, node, parent):
-        """visit a Subscript node by returning a fresh instance of it"""
-        newnode = new.Subscript()
-        _lineno_parent(node, newnode, parent)
-        subcontext, self.asscontext = self.asscontext, None
-        newnode.value = self.visit(node.value, newnode)
-        newnode.slice = self.visit(node.slice, newnode)
-        self.asscontext = subcontext
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_tryexcept(self, node, parent):
-        """visit a TryExcept node by returning a fresh instance of it"""
-        newnode = new.TryExcept()
-        _lineno_parent(node, newnode, parent)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.handlers = [self.visit(child, newnode) for child in node.handlers]
-        newnode.orelse = [self.visit(child, newnode) for child in node.orelse]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_tryfinally(self, node, parent):
-        """visit a TryFinally node by returning a fresh instance of it"""
-        newnode = new.TryFinally()
-        _lineno_parent(node, newnode, parent)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.finalbody = [self.visit(n, newnode) for n in node.finalbody]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_tuple(self, node, parent):
-        """visit a Tuple node by returning a fresh instance of it"""
-        newnode = new.Tuple()
-        _lineno_parent(node, newnode, parent)
-        newnode.elts = [self.visit(child, newnode) for child in node.elts]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_unaryop(self, node, parent):
-        """visit a UnaryOp node by returning a fresh instance of it"""
-        newnode = new.UnaryOp()
-        _lineno_parent(node, newnode, parent)
-        newnode.operand = self.visit(node.operand, newnode)
-        newnode.op = _UNARY_OP_CLASSES[node.op.__class__]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_while(self, node, parent):
-        """visit a While node by returning a fresh instance of it"""
-        newnode = new.While()
-        _lineno_parent(node, newnode, parent)
-        newnode.test = self.visit(node.test, newnode)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.orelse = [self.visit(child, newnode) for child in node.orelse]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_with(self, node, parent):
-        """visit a With node by returning a fresh instance of it"""
-        newnode = new.With()
-        _lineno_parent(node, newnode, parent)
-        newnode.expr = self.visit(node.context_expr, newnode)
-        self.asscontext = "Ass"
-        if node.optional_vars is not None:
-            newnode.vars = self.visit(node.optional_vars, newnode)
-        self.asscontext = None
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_yield(self, node, parent):
-        """visit a Yield node by returning a fresh instance of it"""
-        newnode = new.Yield()
-        _lineno_parent(node, newnode, parent)
-        if node.value is not None:
-            newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-
-class TreeRebuilder3k(TreeRebuilder):
-    """extend and overwrite TreeRebuilder for python3k"""
-
-    def visit_arg(self, node, parent):
-        """visit a arg node by returning a fresh AssName instance"""
-        # the <arg> node is coming from py>=3.0, but we use AssName in py2.x
-        # XXX or we should instead introduce a Arg node in astng ?
-        return self.visit_assname(node, parent, node.arg)
-
-    def visit_excepthandler(self, node, parent):
-        """visit an ExceptHandler node by returning a fresh instance of it"""
-        newnode = new.ExceptHandler()
-        _lineno_parent(node, newnode, parent)
-        if node.type is not None:
-            newnode.type = self.visit(node.type, newnode)
-        if node.name is not None:
-            newnode.name = self.visit_assname(node, newnode, node.name)
-        newnode.body = [self.visit(child, newnode) for child in node.body]
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_nonlocal(self, node, parent):
-        """visit a Nonlocal node and return a new instance of it"""
-        newnode = new.Nonlocal(node.names)
-        _set_infos(node, newnode, parent)
-        return newnode
-
-    def visit_raise(self, node, parent):
-        """visit a Raise node by returning a fresh instance of it"""
-        newnode = new.Raise()
-        _lineno_parent(node, newnode, parent)
-        # no traceback; anyway it is not used in Pylint
-        if node.exc is not None:
-            newnode.exc = self.visit(node.exc, newnode)
-        if node.cause is not None:
-            newnode.cause = self.visit(node.cause, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-    def visit_starred(self, node, parent):
-        """visit a Starred node and return a new instance of it"""
-        newnode = new.Starred()
-        _lineno_parent(node, newnode, parent)
-        newnode.value = self.visit(node.value, newnode)
-        newnode.set_line_info(newnode.last_child())
-        return newnode
-
-
-if sys.version_info >= (3, 0):
-    TreeRebuilder = TreeRebuilder3k
-
-