Re: Question about using Lua for defining GUIs

[pixellent@...]

I believe I am using Lua 4.x, not version 5.

Thanks
Mike

Quoting RLake@oxfam.org.uk:

> 
>           Component
>           { (*** line 39 ***)
>                parent = "PlayGUI",
>                type = "TextLabel"
>           }
> }
> 
> 
> 
> > It doesn't work. Lua complains:
> 
> > error: `=' expected;
> >  last token read: `{' at line 39 in file `scripts/testSDL/gui.lua'
> > stack traceback:
> >   1:  function `Exec' [C]
> >   2:  main of file `scripts/testSDL/main.lua' at line 5
> > *** Syntax error in script file scripts/testSDL/gui.lua
> 
> Interesting... without looking at the Lua parser or trying anything, my
> hunch
> is that you're running into a line-end-aware issue introduced with Lua 5.
> 
> Try doing the way I suggested, with
>       children = { Component { }, Component { } }
> 
> (or some such.)
> 
> 
> > I wanted to pass the table into a C function, but I haven't managed to
> get that
> > working. That's what I was referring to in my code; sorry if that wasn't
> clear.
> 
> You have to use the Lua API to go through the table. The Lua manual is
> reasonably clear, I think; you push the table and the key on the stack,
> and then extract the value. Or you can iterate through all of the keys,
> but if you know which ones you're looking for, just getting them from
> the table is better. It is a matter of style whether you worry about
> there being unknown keys in the table: often that indicates a typo, which
> means that a check would have been a good thing, but often it means that
> the Lua script was stashing extra useful information into the structure.
> 
> To get at the values in the children table that I recommend, you want
> to use the numeric index API, which will let you extract them in the
> right order; if you iterate with next, you might get a surprise.
> 
> R.
> 
>