1 files changed, 28 insertions, 0 deletions
diff --git a/layout/generic/FrameClass.py b/layout/generic/FrameClass.py
new file mode 100644
index 0000000000..0fae9e115e
--- /dev/null
+++ b/layout/generic/FrameClass.py
@@ -0,0 +1,28 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+# Leaf constants to pass to Frame's leafness argument.
+LEAF = "Leaf"
+NOT_LEAF = "NotLeaf"
+DYNAMIC_LEAF = "DynamicLeaf"
+
+
+class FrameClass:
+    def __init__(self, cls):
+        self.cls = cls
+
+
+class Frame(FrameClass):
+    def __init__(self, cls, ty, leafness):
+        FrameClass.__init__(self, cls)
+        self.ty = ty
+        self.leafness = leafness
+        self.is_concrete = True
+
+
+class AbstractFrame(FrameClass):
+    def __init__(self, cls):
+        FrameClass.__init__(self, cls)
+        self.is_concrete = False