[Web-SIG] My original template API proposal
Ian Bicking
ianb at colorstudy.com
Sun Feb 5 21:46:35 CET 2006
Ian Bicking wrote:
> def render(template_instance, vars, format="html", fragment=False):
Here I can magically turn this into a WEB templating spec:
def render(template_instance, vars, format="html", fragment=False,
wsgi_environ=None, set_header_callback=None)
wsgi_environ is the environ dictionary if this is being called in a WSGI
context. set_header_callback can be called like
set_header_callback(header_name, header_value) to write such a header to
the response. Frameworks may or may not allow for setting headers. If
they don't allow for it, they shouldn't provide that callback (thus
headers will not be mysteriously thrown away -- instead they will be
rejected immediately). [Should set_header_callback('Status', '404 Not
Found') be used, or a separate callback, or...?]
This follows what all "server pages" templates I know of do. That is,
they do not have special syntax related to any metadata (i.e., headers)
or even any special syntax related to web requests. Instead the web
request is represented through some set of variables available in the
template.
By putting these variables directly in the call to render(), we give a
standard location for template languages to look for these values, and
they can represent them internally however they choose. This does not
preclude sending request- or response-related values in through vars
directly.
--
Ian Bicking | ianb at colorstudy.com | http://blog.ianbicking.org
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