I have found time to complete version 1 of my LiveCode List Processor. You can
find it at https://github.com/PeterWAWood/LiveCode-ListProcessor
Many of you may be wondering why I bothered to write it when LiveCode’s
built-in list processing (of delimited strings) is very good. The main reason
is that LiveCode’s lists lack a memory. You can’t process a couple of items at
the top of a list, go and do some thing else and then start processing the
third item in the list. Well not easily. The List Processor does have a memory
and you can move forwards and backwards along a list. The current position is
even remembered when the list is saved.
A simple example of its use would be if you wanted to use some colours in turn.
First you would make a list:
put LP.makeList(“red:green:blue:pink:purple:brown:black:”, “:”) into
myColours
When you wanted to get the next colour, you would simply get the next item in
the list:
put LP.next(myColours) into nextColour #nextColour would be set to
“green"
You can get the next colour
put LP.next(myColours) into nextColour #nextColour would be set to
“blue"
You can save the list
put LP.save(myColours, myURL) into tTemp
# tTemp
would be a binary copy of the list
You can load the list from the URL and get the next colour
put LP.load(myURL) into myColours
put LP.next(myColours) into nextColour #nextColour would be set to
“pink”
I suspect the number of uses of these lists with a memory is quite wide. I plan
to use it to store data that I previously held in a set of cards. You can
navigate through the list in a similar way to how you would navigate through
cards. One small difference is that the lists don’t automatically cycle around
from the last to first items as LiveCode cards do. (It would be easy to add
that to the List Processor though).
When I was developing the List Processor, I wrote the tests using LiveCode
MiniTest -https://github.com/PeterWAWood/LiveCode-MiniTest
The is some simple documentation on the Github page.
When writing the List Processor, I concentrated on getting it working correctly
rather than speed. I’m sure that big improvements could be made and I would
welcome comments and suggestions.
Regards
Peter
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
