Inspecting argument names
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- Subject: Inspecting argument names
- From: Daurnimator <quae@...>
- Date: 2011年6月25日 21:50:18 +1000
I'm trying to find a way to get the argument names via the debug
interface, but falling flat on my face.
==> they aren't available from debug.getinfo
The best idea I've got at the moment is to set a call hook and then
inspect with debug.getlocal; but I can't bail out of the function from
a hook:
local names
local function hook ()
debug.sethook() --Turn off hook.
names = {}
local i=1
while true do
local name , value = debug.getlocal(2,i)
if name == nil or name:sub(1,1) == "(" then break end
names[i]=name
i=i+1
--print(name,value)
end
end
local function getargnames ( func )
debug.sethook(hook,"c")
func()
return names
end
local argnames = getargnames(function(a,b,c) print("Don't do the
function") end)
If I try to throw an error from the hook; I can't seem to catch it
with a pcall. Also pcall seems to make the argument list disappear.
(replace func() above with pcall(func))
Anyone got any ideas?
Failing any good ideas; could the lua authors include this in the
debug info somewhere?
Regards,
Daurn.