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Parsing Tag decorator

Author:
pgcd
Posted:
May 19, 2010
Language:
Python
Version:
1.2
Score:
-1 (after 1 ratings)

A simple decorator to register a template.Node object as a tag, without the need to write the usual "token.split_contents() yatta yatta blatta blatta" function.

The decorator should be called with the name of the tag, and an optional required named argument in case your tag requires a minimum number of arguments.

Please note that all the arguments in the templatetag call will be passed to the node (except the templatetag name and the for and as keywords) in the order given.

Suggestions etc are very welcome, of course =)

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def parsingTag(node, name, required=0):
    r"""
    Decorator to replace the standard tag mini-parser. 
    Will pass all the parameters to the node, in the order given, after filtering out "for" and "as".
    Sample tag:
        @parsingTag("a_tag")
        class ANode(template.Node):
            def __init__(self, someval, retval):
                self.someval=someval
                self.retval=retval
            def render(self, context):
                context[self.retval]=self.someval
                print self.someval
                return ''
    
    Sample template usage:
        {% a_tag for "example" as retval %}
    """
    #@ register.tag(name=name)
    def do_parsing(parser, token):
        args=token.split_contents()
        args=filter(lambda x: x not in ['for', 'as'], args)
        if required<len(args):
            return node(*args[1:])
        else:
            raise template.TemplateSyntaxError, "Tag %s requires at least %s arguments"%(args[0], required)
    register.tag(name, do_parsing)

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