Re: Suggestion for 5.3: import() for creating a "slew" of locals
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- Subject: Re: Suggestion for 5.3: import() for creating a "slew" of locals
- From: Petite Abeille <petite.abeille@...>
- Date: 2013年11月17日 21:57:16 +0100
On Nov 17, 2013, at 8:46 AM, Sir Pogsalot <sir.pogsalot@gmail.com> wrote:
> (please be constructive, I know this is a topic for bad criticism in some circles)
BAD! BAD! BAD! Ok, now that’s out of the way, let the hack fest begin! :D
Two devious hacks for your consideration:
(1) (ab)use _ENV
import( 'math', 'min', 'max' )
print( min, min( 1, 2 ) )
print( max, max( 1, 2 ) )
print( math )
—8<—
local function import( aName, ... )
local aModule = require( aName )
local aFunction = debug.getinfo( 2, 'f' ).func
local _, anEnvironement = debug.getupvalue( aFunction, 1 )
for anIndex = 1, select( '#', ... ) do
local aName = select( anIndex, ... )
anEnvironement[ aName ] = aModule[ aName ]
end
end
—>8—
(2) (ab)use locals
local min, max = nil; import( 'math' );
print( min, min( 1, 2 ) )
print( max, max( 1, 2 ) )
—8<—
local function import( aName )
local aModule = require( aName )
local anIndex = 0
local aList = {}
while true do
anIndex = anIndex + 1
if debug.getlocal( 2, anIndex ) == nil then
break
end
end
for anIndex = anIndex - 1, 1, -1 do
local aName, aValue = debug.getlocal( 2, anIndex )
if aModule[ aName ] == nil or aValue ~= nil then
break
end
debug.setlocal( 2, anIndex, aModule[ aName ] )
end
end
—>8—
All these weird and delightful ways to shoot oneself in the foot! yeah!