def page_content(self):
"""Get traversable content providers for the context.
Say, we have a viewlet manager named ExtraInfo, registered for persons.
As viewlet managers implement IContentProvider, we can do:
<div tal:repeat="person view/persons">
<p tal:content="person/title"></p>
<div tal:replace="structure person/schooltool:page_content/ExtraInfo"></div>
</div>
"""
if self.engine is None:
return None
vars = self.engine.vars
context = self.context
request = vars.get('request', None)
page = view = vars.get('view', None)
while (page is not None and
not IPageBase.providedBy(page)):
page = getattr(page, '__parent__', None)
if page is None:
page = view
while (page is not None and
not IBrowserPage.providedBy(page)):
page = getattr(page, '__parent__', None)
providers = queryMultiAdapter(
(context, request, page),
IContentProviders)
if ITALESFunctionNamespace.providedBy(providers):
providers.setEngine(self.engine)
return providers
def _eval(self, econtext,
isinstance=isinstance):
vars = econtext.vars
compiled_path = self._compiled_path
base = self._base
if base == 'CONTEXTS' or not base: # Special base name
ob = econtext.contexts
else:
ob = vars[base]
if isinstance(ob, DeferWrapper):
ob = ob()
for element in compiled_path:
if isinstance(element, tuple):
ob = self._traverser(ob, element, econtext)
elif isinstance(element, basestring):
val = vars[element]
# If the value isn't a string, assume it's a sequence
# of path names.
if isinstance(val, basestring):
val = (val,)
ob = self._traverser(ob, val, econtext)
elif callable(element):
ob = element(ob)
# TODO: Once we have n-ary adapters, use them.
if ITALESFunctionNamespace.providedBy(ob):
ob.setEngine(econtext)
else:
raise "Waagh!"
return ob
def _eval(self, econtext, isinstance=isinstance):
vars = econtext.vars
compiled_path = self._compiled_path
base = self._base
if base == 'CONTEXTS' or not base: # Special base name
ob = econtext.contexts
else:
ob = vars[base]
if isinstance(ob, DeferWrapper):
ob = ob()
for element in compiled_path:
if isinstance(element, tuple):
ob = self._traverser(ob, element, econtext)
elif isinstance(element, six.string_types):
val = vars[element]
# If the value isn't a string, assume it's a sequence
# of path names.
if isinstance(val, six.string_types):
val = (val, )
ob = self._traverser(ob, val, econtext)
elif callable(element):
ob = element(ob)
# TODO: Once we have n-ary adapters, use them.
if ITALESFunctionNamespace.providedBy(ob):
ob.setEngine(econtext)
else:
raise ValueError(repr(element))
return ob