Re: __tostring and string.format
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- Subject: Re: __tostring and string.format
- From: Etan Reisner <deryni@...>
- Date: Tue, 7 Dec 2010 14:25:39 -0500
On Mon, Dec 06, 2010 at 08:11:55AM +0200, steve donovan wrote:
> local format = string.format
>
> function formatx (fmt,...)
> local args = {...}
> local i = 1
> for p in fmt:gmatch('%%s') do
> if type(args[i]) ~= 'string' then
> args[i] = tostring(args[i])
> end
> i = i + 1
> end
> return format(fmt,unpack(args))
> end
That doesn't work for formats with any non-%s specifiers. Any non-%s
specifier will throw off the i counter for later arguments.
formatx('%s(%x)=%s(%x)',1,5,nil,10)
lua: test.lua:13: bad argument #4 to 'format' (string expected, got nil)
It also isn't safe for argument lists with holes as {}/unpack isn't
guaranteed to preserve the full list when presented with holes, but this
is easy enough to fix with select.
-Etan