XHandler

What

XHandler is an AppleScript library to execute a handler with specifying its name with a text. This libary allows to change a handler to execute at run-time.

Fhutermore, followings can be made possible.

Check whther the script object has the handler or not.
If the script object don't have called handler, it is made possible that the script object can hand calling the handler over another script object.

XHandler can be used for chain of responder pattern and method forwarding.

XHandler can deal with handlers with positional parameters. But handlers which have labeld parameters are not supported.

Sample

use XHandler : script "XHandler"

script BScript

on say_msg(a_msg)

return "hey " & a_msg

end say_msg

end script

script AScript

on show_msg(a_msg)

return "hello " & a_msg

end show_msg

-- successor object to foward calling handlers which are not implemented.

on successor()

return BScript

end successor

end script

(*== Simply calling handler ==*)

set xhandler1 to XHandler's make_with("show_msg", 1)

log xhandler1's do(AScript, "good morning") -- hello good morning

(*== Test whether AScript can respont to the handler "show_msg" ==*)

log xhandler1's responded_by(AScript) -- true

(*== If target object can't resond to the handler, try to call handler in a successr object . ==*)

set xhandler2 to XHandler's make_with("say_msg", 1)

log xhandler2's call_to(AScript, "good evening") -- "hey good evening"