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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. @ivar attributeName: The attribute with which exposed methods will be tracked. """ def __init__(self, doc=None): self.doc = doc def __call__(self, *funcObjs): """ 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.declarations.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}. """ if not funcObjs: raise TypeError("expose() takes at least 1 argument (0 given)") for fObj in funcObjs: fObj.exposedThrough = getattr(fObj, 'exposedThrough', []) fObj.exposedThrough.append(self) return funcObjs[0] _nodefault = object() def get(self, instance, methodName, default=_nodefault): """ 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. """ method = getattr(instance, methodName, None) exposedThrough = getattr(method, 'exposedThrough', []) if self not in exposedThrough: if default is self._nodefault: raise UnexposedMethodError(self, methodName) return default return method @classmethod def _withDocumentation(cls, thunk): """ Slight hack to make users of this class appear to have a docstring to documentation generators, by defining them with a decorator. (This hack should be removed when epydoc can be convinced to use some other method for documenting.) """ return cls(thunk.__doc__) # Avoid exposing the ugly, private classmethod name in the docs. Luckily this # namespace is private already so this doesn't leak further. exposer = Expose._withDocumentation @exposer def renderer(): """ 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.
""" @implementer(IRenderable) class Element(object): """ 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. @type loader: L{ITemplateLoader} provider @ivar loader: The factory which will be used to load documents to return from C{render}. """ loader = None def __init__(self, loader=None): if loader is not None: self.loader = loader def lookupRenderMethod(self, name): """ Look up and return the named render method. """ method = renderer.get(self, name, None) if method is None: raise MissingRenderMethod(self, name) return method def render(self, request): """ 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}.) """ loader = self.loader if loader is None: raise MissingTemplateLoader(self) return loader.load()