Add pylint to depot_tools.

third_party/logilab/astng/rebuilder.py

Index: third_party/logilab/astng/rebuilder.py
diff --git a/third_party/logilab/astng/rebuilder.py b/third_party/logilab/astng/rebuilder.py
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+# 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
+
+