Script Only stacks

William Prothero prothero at
Fri Feb 19 19:56:59 EST 2016

Thanks, Richard. That clears it up.

> On Feb 19, 2016, at 3:04 PM, Richard Gaskin <ambassador at> wrote:
> William Prothero wrote:
> > I decided to check out script only stacks. I am in LC8 (DP14). I
> > noticed that there is a sub-menu item in “New Stack”, at the bottom
> > of the list, for a “Script Only” stack. Fine and dandy. It shows up
> > in the Project Browser. But, when I click on the icon to the left of
> > the stack entry (in the project browser), it opens and a card appears
> > below it. I thought script only stacks had only the stack, not cards.
> > So, is the Project Browser converting the stack to a regular stack?
> A script-only stack is just that:  a plain text file in which the first line is:
> stack "stackname"
> ...and below that is the stack's script.  That's it.  You can see several examples throughout the IDE install.
> When the engine reads a text file with that header using any normal stack-access syntax (e.g. "open stack" or "start using") it instantiates an actual stack object from it.  And since a stack in LiveCode can't exist without a card, the card comes along for the ride.
> While it's in memory it behaves just like a LiveCode-native binary stack - you can even set custom properties in it.  Just be aware that regardless what you do with it while it's in memory, the only thing that will be saved in a script-only stack is, as the name implies, the script.
> > Just wondering about script only stacks. I use a lot of substacks to
> > hold various script resources, and it looks like there might be just
> > a bit less overhead in script only stacks.
> >
> > BUT, can script only stacks be substacks?
> No.  A substack is part of the native binary stack structure of a normal stack.  As such, only other native binary stacks can be used as substacks, and only in a native binary mainstack.
> -- 
> Richard Gaskin
> Fourth World Systems
> Software Design and Development for the Desktop, Mobile, and the Web
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