[swift-users] Instantiate Swift class from string

Matthew Davies daviesgeek at gmail.com
Thu Dec 10 18:13:49 CST 2015

Okay I'll have to dig more into using that sort of syntax.

And no problem ;)

*Matthew Davies*
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Director of Photography, OffBlock Films <http://offblockfilms.com>
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On Thu, Dec 10, 2015 at 4:12 PM, Brent Royal-Gordon <brent at architechies.com>

> (Sorry for the repeat, Matthew.)
> > Can you clarify a bit on that? So, what you're saying is to generate
> routing code based off the DSL router I've written?
> Yes, unless you can modify your DSL so you can directly provide your
> controller classes, you’ll probably need to generate code.
> By “provide your controller classes”, I mean that you could make a routes
> file which looked something like this (this routing syntax is loosely
> inspired by Rails):
>         import MyFramework.Router
>         // UsersController.self is an instance which represents the
> UsersController class.
>         // It’s of type UsersController.Type, which might (for instance)
> be a subtype of WebController.Type, etc.
>         Router.root.resources(UsersController.self, path: “users”) { users
> in
>                 users.resources(PostsController.self, path: “posts”) {
> posts in
>                         // PostsController.comments is a way to retrieve a
> closure which calls PostsController’s comments() instance method.
>                         // You use it by saying something like
> `myClosure(myControllerInstance)(arg1, arg2, etc)`.
>                         posts.get(PostsController.comments, path:
> “comments”)
>                 }
>                 users.resources(CommentsController.self, path: “comments”)
>         }
> Note that in all cases you pass instances, not names, to your routing
> APIs. This allows you to write code that can work with any compatible class
> or method without any danger of trying to use a class or method that
> doesn’t exist.
> But using this approach limits the flexibility of your routing DSL’s
> design. For instance, you can’t just take the string “users” and infer that
> you should use UsersController. If you want that sort of more sophisticated
> behavior, you’re going to need to generate Swift code instead.
> --
> Brent Royal-Gordon
> Architechies
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