[z3-checkins] r5846 - z3/Five/branch/dc-experiments

[dreamcatcher at codespeak.net]

Author: dreamcatcher
Date: Mon Aug  2 20:07:51 2004
New Revision: 5846

Added:
   z3/Five/branch/dc-experiments/viewable.py   (contents, props changed)
Log:
Forgot to add this file *wink*

Added: z3/Five/branch/dc-experiments/viewable.py
==============================================================================
--- (empty file)
+++ z3/Five/branch/dc-experiments/viewable.py	Mon Aug  2 20:07:51 2004
@@ -0,0 +1,72 @@
+##############################################################################
+#
+# Copyright (c) 2004 Five Contributors. All rights reserved.
+#
+# This software is distributed under the terms of the Zope Public
+# License (ZPL) v2.1. See COPYING.txt for more information.
+#
+##############################################################################
+"""Machinery for making things viewable
+
+$Id: traversable.py 5763 2004-07-28 20:15:11Z dreamcatcher $
+"""
+from zExceptions import NotFound
+from zope.exceptions import NotFoundError
+from zope.component import getView, getDefaultViewName, ComponentLookupError
+from zope.interface import implements
+from zope.publisher.interfaces.browser import IBrowserRequest
+from traversable import FakeRequest
+
+_marker = object
+
+class Viewable:
+    """A mixin to make an object viewable.
+    """
+    __five_viewable__ = True
+
+    def __fallback_default__(self, request):
+        """Try to dispatch to existing index_html or __call__"""
+        if getattr(self, 'index_html', None):
+            return self, ('index_html',)
+        if getattr(self, 'fallback_call__', None):
+            return self, ('fallback_call__',)
+        # XXX Should never get this far. But if it does?
+
+    def fallback_call__(self, *args, **kw):
+        """By default, return self"""
+        return self
+
+    # we have a default view, tell zpublisher to go there
+    def __browser_default__(self, request):
+        name = None
+        try:
+            name = getDefaultViewName(self, request)
+        except ComponentLookupError:
+            pass
+        if name:
+            if name == '__call__':
+                return self, ('fallback_call__',)
+            view = self.unrestrictedTraverse([name])
+            if view is not None:
+                return self, (name,)
+        return self.__fallback_default__(request)
+    __browser_default__.__five_method__ = True
+
+    # this is technically not needed because ZPublisher finds our
+    # attribute through __browser_default__; but we also want to be
+    # able to call pages from python modules, PythonScripts or ZPT
+    def __call__(self, *args, **kw):
+        """ """
+        request = kw.get('REQUEST')
+        if not IBrowserRequest.providedBy(request):
+            request = getattr(self, 'REQUEST', None)
+            if not IBrowserRequest.providedBy(request):
+                request = FakeRequest()
+        obj, name = self.__browser_default__(request)
+        if name:
+            name = name[0]
+            meth = obj.unrestrictedTraverse([name])
+            if meth is not None:
+                return meth(*args, **kw)
+        return self.fallback_call__(*args, **kw)
+    __call__.__five_method__ = True