Il giorno 29/lug/07, alle ore 22:48, Tomas Kopecek ha scritto:
> I know, it's syntactical nonsense. But does anybody know about some
> way
> how to combine variable content with string content? Is it possible?
>
> For example, very crude way could be something like
>
> {% img %} {{BASE_URL}}/path/z.gif {% endimg %}
Maybe something like {% img base_url "path/z.gif" %}: let string
content be surrounded by double quotes, and let the tag join
everything for you.
Code:
from django.template import Node, TemplateSyntaxError, Library
register = Library()
class MixedNode(Node):
class Variable(object):
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
def __init__(self, args):
self.parameters = [
[self.Variable(arg),
arg.rstrip('"').lstrip('"')][arg[0] == arg
[-1] == '"']
for arg in args]
def get_param(self, i, context):
if isinstance(i, self.Variable):
return context[str(i)]
else:
return i
def get_string(self, context):
return ''.join([self.get_param(param, context) for param in
self.parameters])
class ImageNode(MixedNode):
def render(self, context):
return '<img src="%s"/>' % self.get_string(context)
def do_img(parser, token):
arglist = token.split_contents()
if len(arglist) < 2:
raise TemplateSyntaxError, "%r tag requires at least one
argument"
% token.contents.split()[0]
return ImageNode(arglist[1:])
register.tag('img', do_img)
(you can then subclass MixedNode for pretty much everything...)
Regards,
--
Emanuele
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