Re: Problems with bubbling up tracebacks in Lua (& proposed solution)
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- Subject: Re: Problems with bubbling up tracebacks in Lua (& proposed solution)
- From: Philipp Janda <siffiejoe@...>
- Date: 2013年9月25日 17:42:24 +0200
Am 25.09.2013 15:38 schröbte Enrique Garcia Cota:
Hello Philip,
Hi!
Thanks for answering. I am afraid your example assumes I have control over
the how the errors are thrown in the first place - that is not the case.
Ah, I assumed, because you proposed an extra argument to `error`. Do you
have control over how the errors are caught? If so, maybe you can use
the modifications below ...
[...]
Regards,
Enrique
Philipp
On Wed, Sep 25, 2013 at 12:26 PM, Philipp Janda <siffiejoe@gmx.net> wrote:
local err_meta = {
__tostring = function( e )
e[ 1 ] = tostring( e[ 1 ] )
return table.concat( e, "\n" )
end,
}
local function make_error( s )
return setmetatable( { s }, err_meta )
end
local function err_traceback( e )
if type( e ) ~= "table" then
e = make_error( e )
end
e[ 2 ] = e[ 2 ] or debug.traceback( nil, 3 )
return e
end
local function a()
error( "argh" )
end
local function b()
local ok, err = xpcall( a, err_traceback )
err[ 1 ] = string.upper( err[ 1 ] ) .. "!!!!"
err[ 3 ] = debug.traceback( nil, 1 )
error( err )
end
b()
Output is (using the Lua 5.2 default interpreter):
lua: ERR.LUA:20: ARGH!!!!
stack traceback:
err.lua:20: in function <err.lua:19>
[C]: in function 'xpcall'
err.lua:24: in function 'b'
err.lua:30: in main chunk
[C]: in ?
stack traceback:
err.lua:26: in function 'b'
err.lua:30: in main chunk
[C]: in ?