Move grit from DEPS into src.

tools/grit/grit/node/mapping.py

Index: tools/grit/grit/node/mapping.py
diff --git a/tools/grit/grit/node/mapping.py b/tools/grit/grit/node/mapping.py
new file mode 100755
index 0000000000000000000000000000000000000000..259be97c6b28d6eb403156512831f86254510e0e
--- /dev/null
+++ b/tools/grit/grit/node/mapping.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+'''Maps each node type to an implementation class.
+When adding a new node type, you add to this mapping.
+'''
+
+
+from grit import exception
+
+from grit.node import empty
+from grit.node import message
+from grit.node import misc
+from grit.node import variant
+from grit.node import structure
+from grit.node import include
+from grit.node import io
+
+
+_ELEMENT_TO_CLASS = {
+  'identifiers'   : empty.IdentifiersNode,
+  'includes'      : empty.IncludesNode,
+  'messages'      : empty.MessagesNode,
+  'outputs'       : empty.OutputsNode,
+  'structures'    : empty.StructuresNode,
+  'translations'  : empty.TranslationsNode,
+  'include'       : include.IncludeNode,
+  'emit'          : io.EmitNode,
+  'file'          : io.FileNode,
+  'output'        : io.OutputNode,
+  'ex'            : message.ExNode,
+  'message'       : message.MessageNode,
+  'ph'            : message.PhNode,
+  'else'          : misc.ElseNode,
+  'grit'          : misc.GritNode,
+  'identifier'    : misc.IdentifierNode,
+  'if'            : misc.IfNode,
+  'part'          : misc.PartNode,
+  'release'       : misc.ReleaseNode,
+  'then'          : misc.ThenNode,
+  'structure'     : structure.StructureNode,
+  'skeleton'      : variant.SkeletonNode,
+}
+
+
+def ElementToClass(name, typeattr):
+  '''Maps an element to a class that handles the element.
+
+  Args:
+    name: 'element' (the name of the element)
+    typeattr: 'type' (the value of the type attribute, if present, else None)
+
+  Return:
+    type
+  '''
+  if name not in _ELEMENT_TO_CLASS:
+    raise exception.UnknownElement()
+  return _ELEMENT_TO_CLASS[name]
+