Peter M. Brigham wrote:
On Jun 21, 2014, at 2:33 AM, Richmond wrote:
put 1 into XX
repeat until XX>7
do something
put 1 into ZZ
repeat until ZZ>7
do something else
put 1 into YY
repeat until YY>7
ask "What colour are you socks?"
if it contains "purple" then
goto %%%
end if
add 1 to YY
end repeat
add 1 to ZZ
end repeat
add 1 to XX
end repeat
%%%
I like this. The syntax could be
go %n -- eg, %4
then the execution would jump to the statement
%n -- eg, %4
(Which would allow really flexible GOTO equivalents that would be independent
of script line numbering. I always struggled with the Fortran GOTO statements,
since I was always having to renumber my lines when I revised my programs.)
Enhancement request, anyone?
At the RevLive conference in Vegas a few yeas back, Robert Cailliau's
opening keynote covered some of the most adventurous feature requests
I've ever heard anyone suggest for xTalks.
Among them was the notion of named control structures, in part for
exactly the reason covered in this thread, the desire to exit a specific
loop when loops are nested.
I can't recall the specifics of his proposed syntax, but I remember
being impressed by how natural it seemed. Maybe it was along the lines of:
repeat with i = 1 to tSomething named "MySomethingLoop"
repeat with j = 1 to tSomethingElse named "MyOtherLoop"
DoSomethingWith i,j
exit "MySomethingLoop"
end repeat
end repeat
With named control structures we'd never need to worry about line numbers.
I'm not sure if that was submitted as a feature request, but IMO it
should be. And it would be cool to have just about everything else he
proposed go into the DB as well - all of it was valuable, very
forward-thinking, reflecting the best of many other languages, all
presented in a very xTalk way.
--
Richard Gaskin
Fourth World
LiveCode training and consulting: http://www.fourthworld.com
Webzine for LiveCode developers: http://www.LiveCodeJournal.com
Follow me on Twitter: http://twitter.com/FourthWorldSys
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