[R] add an _nodes.py for avoiding circular imports.py

1 files changed, 75 insertions, 0 deletions

diff --git a/_nodes.py b/_nodes.py
new file mode 100644
index 00000000..5958378d
--- /dev/null
+++ b/_nodes.py
@@ -0,0 +1,75 @@
+# -*- coding: utf-8 -*-
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+"""
+Module containing the node classes; it is only used for avoiding circular imports
+"""
+
+from __future__ import generators
+
+__docformat__ = "restructuredtext en"
+
+from itertools import imap
+
+try:
+    from logilab.astng._nodes_ast import *
+    from logilab.astng._nodes_ast import _const_factory
+    AST_MODE = '_ast'
+except ImportError:
+    from logilab.astng._nodes_compiler import *
+    from logilab.astng._nodes_compiler import _const_factory
+    AST_MODE = 'compiler'
+
+
+INFER_NEED_NAME_STMTS = (From, Import, Global, TryExcept)
+LOOP_SCOPES = (Comprehension, For,)
+
+
+STMT_NODES = (
+    Assert, Assign, AugAssign, Break, Class, Continue, Delete, Discard,
+    ExceptHandler, Exec, For, From, Function, Global, If, Import, Pass, Print,
+    Raise, Return, TryExcept, TryFinally, While, With, Yield
+    )
+
+ALL_NODES = STMT_NODES + (
+    Arguments, AssAttr, AssName, BinOp, BoolOp, Backquote,  CallFunc, Compare,
+    Comprehension, Const, Decorators, DelAttr, DelName, Dict, Ellipsis,
+    EmptyNode,  ExtSlice, Getattr,  GenExpr, IfExp, Index, Keyword, Lambda,
+    List,  ListComp, Module, Name, Slice, Subscript, UnaryOp, Tuple
+    )
+
+# constants ... ##############################################################
+
+CONST_CLS = {
+    list: List,
+    tuple: Tuple,
+    dict: Dict,
+    }
+
+def const_factory(value):
+    """return an astng node for a python value"""
+    try:
+        # if value is of class list, tuple, dict use specific class, not Const
+        cls = CONST_CLS[value.__class__]
+        node = cls()
+        if isinstance(node, Dict):
+            node.items = ()
+        else:
+            node.elts = ()
+    except KeyError:
+        try:
+            node = Const(value)
+        except KeyError:
+            node = _const_factory(value)
+    return node
+