Initial version of DisplayPublisher is working.

* Backend and frontend implementations.
* plain text, html and svg handlers in the Qt console.

IPython/core/displaypub.py

@@ -0,0 +1,40
+# -*- coding: utf-8 -*-
+"""An interface for publishing data related to the display of objects.
+
+Authors:
+
+* Brian Granger
+"""
+
+#-----------------------------------------------------------------------------
+#       Copyright (C) 2008-2010 The IPython Development Team
+#
+#  Distributed under the terms of the BSD License.  The full license is in
+#  the file COPYING, distributed as part of this software.
+#-----------------------------------------------------------------------------
+
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
+
+from IPython.config.configurable import Configurable
+
+#-----------------------------------------------------------------------------
+# Main payload class
+#-----------------------------------------------------------------------------
+
+class DisplayPublisher(Configurable):
+
+    def _validate_data(self, source, data, metadata=None):
+        if not isinstance(source, str):
+            raise TypeError('source must be a str, got: %r' % source)
+        if not isinstance(data, dict):
+            raise TypeError('data must be a dict, got: %r' % data)
+        if metadata is not None:
+            if not isinstance(metadata, dict):
+                raise TypeError('metadata must be a dict, got: %r' % data)
+
+    def publish(self, source, data, metadata=None):
+        """Publish data and metadata to all frontends."""
+        pass
+