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from zope.interface import implements
from nevow import inevow
##
## How does a request come to the Page?
##
## or How to use Nevow without all the fancy automations
##
# This is a simple Root page object, the inevow.IResource interface
# tells us that it must implement 2 methods:
# locateChild and renderHTTP.
# locateChild is used to find children of the current page, it must return a
# tuple of (page, remaining_segments)
# if there is no page, and you want to display a 404 page, you will need to return
# a None, () tuple.
class Root(object):
implements(inevow.IResource)
def locateChild(self, ctx, segments):
# This locateChild is 'stupid' since it can only work if the tree of
# pages is static. Anyway it will work for our simple example
if segments[0] == '':
# If the server is looking for the root page segments will be ('',)
# then renderHTTP will be called on self
return self, ()
elif segments[0] == 'foo':
# Now we received a request whose segments had in the first position
# the string foo
# like http://example.org/foo/baz/ -> ('foo', 'baz')
# after the page has been located we return it with the remaining segments
# ('baz')
return self.foo, segments[1:]
else:
return None, ()
def renderHTTP(self, ctx):
# When the server needs to return a response to the request it will call
# the renderHTTP method that will return a string of what needs to be sent.
return """<html><body>Hello world!<br />
<a href="./foo" id="foo">foo</a></body></html>
"""
class Foo(object):
implements(inevow.IResource)
def locateChild(self, ctx, segments):
# segments is the remaining segments returned by the root locateChild
# see segments[1:]
if segments[0] == 'baz':
return self.baz, segments[1:]
else:
return None, ()
def renderHTTP(self, ctx):
return """<html><body><h1 id="heading">You are in Foo</h1>
<a href="./foo/baz" id="baz">baz</a></body></html>
"""
class Baz(object):
implements(inevow.IResource)
def locateChild(self, ctx, segments):
return None, ()
def renderHTTP(self, ctx):
return '<html><body><h1 id="heading">You are in Baz</h1></body></html>'
# We are adding children to the pages.
# This could also happen inside the class.
root = Root()
root.foo = Foo()
root.foo.baz = Baz()
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