Re: Table constructions

[Tomas <tomas@...>]

> > I'm trying to modify Lua so that a table constructed as:
> >
> >   t = { weight = 9, wibble, foo }
> >
> > results in a table as:
> >
> >   { weight = 9, wibble = true, foo = true }
> >
> > I've been playing around with the code in lparser.c, but I'm not having
> > much success (this is the first time I've done any hacking on Lua).
>
> There is no need to hack the parser. You can set an __index metamethod
> for _G that returns true for undefined global variables. This will do
> what you wish but perhaps it's much more that we you want...
	This doesn't work.  You'll end with { weight=9, [1]=true, [2]=true }

	Following this approach, you could define a __index metamethod
for _G that returns the name of the (undefined global) variable:

> setmetatable (_G, { __index = function (t,k) return k end, })
> t = { weight = 9, wibble, foo }
> for i,v in pairs(t) do print(i,v) end
1       wibble
2       foo
weight  9

	After that you'll have to change the keys of the table:

> function C(t) for i,v in ipairs(t) do t[v] = true end return t end
> t = C { weight = 9, wibble, foo }
> for i,v in pairs(t) do print(i,v) end
1       wibble
2       foo
foo     true
wibble  true
weight  9

	Hope this helps!
		Tomas