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NNTP-Posting-Date: Wed, 07 Nov 2012 09:32:23 -0600
From: Chris Hinsley <chris.hinsley@gmail.com>
Newsgroups: comp.lang.forth
Date: Wed, 7 Nov 2012 15:32:23 +0000
Message-ID: <2012110715322313218-chrishinsley@gmailcom>
References: <2012110713421835115-chrishinsley@gmailcom> <2012Nov7.145519@mips.complang.tuwien.ac.at>
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Subject: Re: Genral advise and comments on callback style words
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On 2012-11-07 13:55:19 +0000, Anton Ertl said:

> Chris Hinsley <chris.hinsley@gmail.com> writes:
>> Folks I have implamented an Amiga style double linked list words set a
>> few days back and I have an emueration word as follows:
>> 
>> \ ( u xt lh -- ln | 0)
>> \ xt api is ( u ln lh -- ln | 0 )
>> : LISTHEAD-ENUMERATE-FORWARDS
>> 	0 >R
>> 	DUP LISTHEAD-GET-HEAD DUP
>> 	BEGIN
>> 		NIP DUP LISTNODE-GET-SUCC
>> 		DUP
>> 	WHILE
>> 		4 PICK 2 PICK 4 PICK
>> 		6 PICK EXECUTE DUP R!
>> 	UNTIL THEN
>> 	2DROP 2DROP DROP
>> 	R>
>> ;
>> 
>> This scans down the list until either it hits the end, or the callback
>> for each node returns a value other than 0, that value is returned and
>> the scan stops if it isn't 0 !
>> 
>> I'd like comments and advice on techniuqe, paticularly for things like
>> the PICK stuff that gathers paramaters for each callback, and the use
>> of the return stack for the returned value. Or if you just plain think
>> I could code this a better way !
> 
> Someone could probably code this in a better way.  "6 PICK" is gross.
> And having no lower case does not help readability.

I'm having issues with the whole case stuff in Forth. I really don't 
like the idea of a case sensative Forth, but feel compeled to write in 
a single case ! Upper case so far, but I could easily swap if the 
powers that be say I should. ;)

Chris