reverse_angular_url for Tornado

views.py

import tornado.web

class BaseHandler(tornado.web.RequestHandler):
    def reverse_angular_url(self, name, *args):
        # Works like regular reverse_url but replaces regex groups
        # with :arg, so it can fit nicely in the AngularJS router

        # for given route named "employee" "/company/(.*)/employees/(.*)$" ->
        # reverse_angular_url("employee", "company_id", "employee_id")
        # returns "/company/:company_id/employees/:employee_id"

        if name in self.application.named_handlers:
            raw_url = self.application.named_handlers[name]._find_groups()[0]
            return raw_url % tuple(":" + a for a in args)
        raise KeyError("%s not found in named urls" % name)