[OS X TeX] TeXShop macro "Select class options"

[Jonathan Kew]

On 30 Aug 2004, at 9:01 am, Will Robertson wrote:

> Basically I'd like not to have to embed my script ever deeper within 
> error-catching if statements; I think I'm missing something basic - 
> I'd expect to be able to to do something like this:
>
> on run
> 	subroutine1
> 	subroutine2
> 	subroutine3
> 	do some final stuff
> end
>
> with the code in each subroutine going something like this:
>
> on subroutine1
> 	do some stuff
> 	if error1, exit run
> end
>
> and so on.
>

Could you use the "try ... on error ..." construct to help?

Along the lines of

	on run
		try
			subroutine1
			subroutine2
			subroutine3
			finalStuff
		 on error errText number errNum
			if errNum = .... -- test for errors that you want to handle
			else -- deal with unknown errors in a generic way, perhaps
			end if
			-- perhaps some cleanup here
		end try
		reallyFinalStuff
	end run

	on subroutine1
		-- do stuff here
		if (something's wrong) then error "Failure in sub1" number 10000 -- 
raise an error
		-- do more stuff
		if (another problem) then error "Failure in sub1" number 10000
	end subroutine1

	etc.

Errors can include other information, too, like a reference to the 
object that caused the failure; check the Applescript doc for more 
information. I believe you can also do things like nest "try" blocks, 
re-throw an error from within the error handler if you want to pass it 
up the chain, etc.

HTH,

JK

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