Converting Ruby-style method signatures back to Obj-C style
Hi all, I have a somewhat esoteric problem and I was wondering if anyone had suggestions about how to deal with it. Basically I'm writing a Ruby class that wraps some Objective-C classes and provides a common interface to them, and I'm using method_missing to pass along messages if the wrapped object understands them. This works great for simple methods that don't have named parameters. However, by the time a call hits method_missing, MacRuby has already converted the method signature to a Ruby-style call. For example, one object I'm wrapping has a method "doScript:in:" - but by the time that hits method_missing I have a method with signature "doScript:" and a list of arguments like "script, {:in => target}". Now of course, I can add some logic to my method_missing handler to check if the second param is a Hash and reconstruct the Obj-C method signature from that. I'm just wondering if MacRuby provides a built-in way to do that, or if I'm missing an easier way to handle this... Any input appreciated! Thanks, -Gabriel
Hi Gabriel, There isn't any way to reconstruct the objc selector. We could expose an API, though, if you file a ticket, but I suspect it's not hard to do. Laurent On Oct 15, 2010, at 2:34 PM, Gabriel Gilder wrote:
Hi all,
I have a somewhat esoteric problem and I was wondering if anyone had suggestions about how to deal with it.
Basically I'm writing a Ruby class that wraps some Objective-C classes and provides a common interface to them, and I'm using method_missing to pass along messages if the wrapped object understands them. This works great for simple methods that don't have named parameters. However, by the time a call hits method_missing, MacRuby has already converted the method signature to a Ruby-style call.
For example, one object I'm wrapping has a method "doScript:in:" - but by the time that hits method_missing I have a method with signature "doScript:" and a list of arguments like "script, {:in => target}".
Now of course, I can add some logic to my method_missing handler to check if the second param is a Hash and reconstruct the Obj-C method signature from that. I'm just wondering if MacRuby provides a built-in way to do that, or if I'm missing an easier way to handle this...
Any input appreciated!
Thanks, -Gabriel
_______________________________________________ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
Agreed, it wasn't difficult. I posted a gist with the solution I came up with: http://gist.github.com/633608 I'd love any feedback if I'm doing this in a nonsensical way. :) -Gabriel On Mon, Oct 18, 2010 at 4:27 PM, Laurent Sansonetti <lsansonetti@apple.com>wrote:
Hi Gabriel,
There isn't any way to reconstruct the objc selector. We could expose an API, though, if you file a ticket, but I suspect it's not hard to do.
Laurent
On Oct 15, 2010, at 2:34 PM, Gabriel Gilder wrote:
Hi all,
I have a somewhat esoteric problem and I was wondering if anyone had suggestions about how to deal with it.
Basically I'm writing a Ruby class that wraps some Objective-C classes and provides a common interface to them, and I'm using method_missing to pass along messages if the wrapped object understands them. This works great for simple methods that don't have named parameters. However, by the time a call hits method_missing, MacRuby has already converted the method signature to a Ruby-style call.
For example, one object I'm wrapping has a method "doScript:in:" - but by the time that hits method_missing I have a method with signature "doScript:" and a list of arguments like "script, {:in => target}".
Now of course, I can add some logic to my method_missing handler to check if the second param is a Hash and reconstruct the Obj-C method signature from that. I'm just wondering if MacRuby provides a built-in way to do that, or if I'm missing an easier way to handle this...
Any input appreciated!
Thanks, -Gabriel
_______________________________________________ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
_______________________________________________ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
participants (3)
-
Gabriel Gilder
-
Gabriel Gilder
-
Laurent Sansonetti