Re: Lua 5.2 wish item: Splicing
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- Subject: Re: Lua 5.2 wish item: Splicing
- From: Tuomo Valkonen <tuomov@...>
- Date: Thu, 9 Nov 2006 20:49:14 +0000 (UTC)
On 2006年11月09日, Javier Guerra <javier@guerrag.com> wrote:
> Mark Hamburg wrote:
>> column{
>> spacing = 10,
>> $makeChildren(),
>> view{
>> title = "footer",
>> }
>> }
>>
>> Where the $ means that we take all of the results from the function rather
>> than just the first.
>
> i'd prefer to have it the other way around, that is using all values by
> default.
I'd actually prefer it never using all the values by default, as it
currently sometimes (but not always) does.
How about extending the ... syntax?
foo { bar = 1, ... = fn(), baz = 2 }
And
a... = fn()
for
a = { ... = fn() }
Or perhaps also
foo { bar = 1, fn() ..., baz = 2 }
(although postfix "operators" may not be such a good idea).
You could then also allow for naming the "vararg" structure
with a similar syntax:
function foo(bar, opts...)
for k, v in ipairs(opts) do whatever end
end
Likewise you could call a function, expanding a table. You could
even support non-integer fields going into the vararg structure as
named parameters (although that may not be so simple with ... no
longer being a table):
function foo(bar, opts...)
if opts.quk then whatever end
end
foo({1,2,3, quk = true}...)
=> bar = 1, opts={2,3,quk=true}
Or maybe, to simplify things, an expanded table should always be
the vararg table, and maybe there could be just one of them in
a function call.
--
Tuomo