Re: LUA Vs Javascript
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- Subject: Re: LUA Vs Javascript
- From: Petite Abeille <petite.abeille@...>
- Date: 2008年6月27日 23:28:41 +0200
On Jun 27, 2008, at 10:48 PM, Jan Schütze wrote:
It would be cool, if that would be possible with error+pcall somehow!
Syntax sugar aside, it's rather straightforward to roll your own try/
catch implementation according to your needs/circumstances, e.g.:
local function try( aFunction, ... )
local someArguments = { ... }
local aLength = select( "#", ... )
return function( catch )
local someResults = { pcall( aFunction,
unpack( someArguments, 1, aLength ) ) }
local aStatus = someResults[ 1 ]
if aStatus == true then
return unpack( someResults, 2, table.maxn( someResults ) )
else
local anException = someResults[ 2 ]
if catch ~= nil then
return catch( anException, aFunction,
unpack( someArguments, 1, aLength ) )
end
return nil, anException
end
end
end
Usage example:
local function catch( anException, ... )
print( anException, ... )
end
local function Test( aValue )
error( 'panic! ' .. aValue )
end
try( Test, 'hello' )( catch )
print( 'Done' )