def __init__(self, token, parser):
        self.token = token
        matches = filter_re.finditer(token)
        var_obj = None
        filters = []
        upto = 0
        for match in matches:
            start = match.start()
            if upto != start:
                raise TemplateSyntaxError("Could not parse some characters: %s|%s|%s"  % \
                        (token[:upto], token[upto:start], token[start:]))
            if var_obj is None:
                var, constant = match.group("var", "constant")
                if constant:
                    try:
                        var_obj = Variable(constant).resolve({})
                    except VariableDoesNotExist:
                        var_obj = None
                elif var is None:
                    raise TemplateSyntaxError("Could not find variable at start of %s." % token)
                else:
                    var_obj = Variable(var)
            else:
                filter_name = match.group("filter_name")
                args = []
                constant_arg, var_arg = match.group("constant_arg", "var_arg")
                if constant_arg:
                    args.append((False, Variable(constant_arg).resolve({})))
                elif var_arg:
                    args.append((True, Variable(var_arg)))
                filter_func = parser.find_filter(filter_name)
                self.args_check(filter_name, filter_func, args)
                filters.append((filter_func, args))
            upto = match.end()
        if upto != len(token):
            raise TemplateSyntaxError("Could not parse the remainder: '%s' from '%s'" % (token[upto:], token))

        self.filters = filters
        self.var = var_obj
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.3/django/template/base.py/FilterExpression.__init__/original