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- Subject: Re: string.sub and __call metamethod
- From: Javier Guerra Giraldez <javier@...>
- Date: Sat, 18 Oct 2008 13:16:54 -0500
On Saturday 18 October 2008, David Manura wrote:
> In, say, Python, strings are thought of as immutable tuples of chars
> that can be indexed and sliced, so you have a notation like s,
> s[-1], s[1:4], and s[2:]. That notation does pose a bit of a
> challenge in Lua since s[i : f()] would normally be interpreted as a
> method call in Lua rather than a range. Shmuel suggested s(i, j).
> Syntax I think is a secondary decision whose details can be worked out
i think a nice feature for 5.3 could be to allow more than one parameter as
index: o[x,y,...] would be interpreted as getmetatable(o).__index(o,x,y,...)
in the case of tables, only the first parameter would be used; but for
user-defined access functions having more could be useful.
if that were possible, setting string.__index = string.sub would let you use
s[i,j] (but s[i] would return a suffix instead of a single char...)
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