Re: Lightweight syntax: a dissident view
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- Subject: Re: Lightweight syntax: a dissident view
- From: Duncan Cross <duncan.cross@...>
- Date: 2010年11月24日 10:24:25 +0000
On Wed, Nov 24, 2010 at 10:10 AM, James Rhodes
<jrhodes@roket-enterprises.com> wrote:
> With regards to your last note about accessing characters through s[i], you
> can actually already do this by setting the metatable for all strings; like
> so:
> mt = {}
> mt["__index"] = function(str, i)
> if (type(i) == "number") then
> return string.sub(str, i, i)
> else
> return string[i]
> end
> end
> debug.setmetatable("", mt)
This is a bit of a tangent but you can actually do this without
needing to use the debug library - the standard getmetatable() does
work on strings (in a standard Lua setup) so you could do:
getmetatable("").__index = function(str, i)
-- (... code ...)
end
-Duncan