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Srg)Expose" a
Helper for exposing methods for various uses using a simple decorator-style
callable.
Instances of this class can be called with one or more functions as
positional arguments. The names of these functions will be added to a list
on the class object of which they are methods.
ffuncObjs.returnc [ R " U/U5 H. n[ US/ 5 nUR U 5 [ USU5 M0 U$ )a
Add one or more functions to the set of exposed functions.
This is a way to declare something about a class definition, similar to
L{zope.interface.implementer}. Use it like this::
magic = Expose('perform extra magic')
class Foo(Bar):
def twiddle(self, x, y):
...
def frob(self, a, b):
...
magic(twiddle, frob)
Later you can query the object::
aFoo = Foo()
magic.get(aFoo, 'twiddle')(x=1, y=2)
The call to C{get} will fail if the name it is given has not been
exposed using C{magic}.
@param funcObjs: One or more function objects which will be exposed to
the client.
@return: The first of C{funcObjs}.
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Retrieve an exposed method with the given name from the given instance.
@raise UnexposedMethodError: Raised if C{default} is not specified and
there is no exposed method with the given name.
@return: A callable object for the named method assigned to the given
instance.
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Decorate with L{renderer} to use methods as template render directives.
For example::
class Foo(Element):
@renderer
def twiddle(self, request, tag):
return tag('Hello, world.')
Will result in this final output::
Hello, world.
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rg)Element ab
Base for classes which can render part of a page.
An Element is a renderer that can be embedded in a stan document and can
hook its template (from the loader) up to render methods.
An Element might be used to encapsulate the rendering of a complex piece of
data which is to be displayed in multiple different contexts. The Element
allows the rendering logic to be easily re-used in different ways.
Element returns render methods which are registered using
L{twisted.web._element.renderer}. For example::
class Menu(Element):
@renderer
def items(self, request, tag):
....
Render methods are invoked with two arguments: first, the
L{twisted.web.http.Request} being served and second, the tag object which
"invoked" the render method.
@ivar loader: The factory which will be used to load documents to
return from C{render}.
Nloaderc Ub Xl g g r- rG )r$ rG s r& __init__Element.__init__ s K r) namer r r c N [ R XS5 nUc [ X5 eU$ )z-
Look up and return the named render method.
N)rC r/ r )r$ rL r5 s r& lookupRenderMethodElement.lookupRenderMethod s) d$/ >%d1 1
r) requestc V U R nUc [ U 5 eUR 5 $ )a
Implement L{IRenderable} to allow one L{Element} to be embedded in
another's template or rendering output.
(This will simply load the template from the C{loader}; when used in a
template, the flattening engine will keep track of this object
separately as the object to lookup renderers on and call
L{Element.renderer} to look them up. The resulting object from this
method is not directly associated with this L{Element}.)
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