Proposal for compile-time dynamic code or something (was: proposal for reading individual characters from strings faster)
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- Subject: Proposal for compile-time dynamic code or something (was: proposal for reading individual characters from strings faster)
- From: "Thiago L." <fakedme@...>
- Date: 2014年5月03日 18:15:58 -0300
On 03/05/2014 18:04, Coroutines wrote:
The @function() for compile-time constant evaluation with constants
for arguments is an too risky/general -- I can't predict all the
pitfuls -- it was a nice daydream :-)
How about @function(...) which calls function(...) at compile-time and
function(...) has to return a string that gets compiled as code?
Something like...
-----------------------------------------------------------
function localize(name)
return "local "..name.." = "..name
end
@localize'print'
@localize'tostring'
--(etc)
-----------------------------------------------------------
and then it compiles to the same as
-----------------------------------------------------------
function localize(name)
return "local "..name.." = "..name
end
local print = print
local tostring = tostring
-----------------------------------------------------------
Or something like...
-----------------------------------------------------------
local function turntable(...)
local s = "{ "
for x,y in pairs(...) do
s = s .. y .. " = ".. y .. ", "
end
return s .. "}"
end
local env =
@turntable("print","tostring","type","tonumber","pcall","xpcall")
-----------------------------------------------------------
Which would compile to...
-----------------------------------------------------------
local function turntable(...)
local s = "{ "
for x,y in pairs(...) do
s = s .. y .. " = ".. y .. ", "
end
return s .. "}"
end
local env = { print = print, tostring = tostring, type = type, tonumber
= tonumber, pcall = pcall, xpcall = xpcall, }
-----------------------------------------------------------