68 lines
2.2 KiB
Lua
68 lines
2.2 KiB
Lua
|
-------------------------------------------------------------------------------
|
|||
|
|
-- Coroutine safe xpcall and pcall versions
|
|||
|
|
--
|
|||
|
|
-- Encapsulates the protected calls with a coroutine based loop, so errors can
|
|||
|
|
-- be dealed without the usual Lua 5.x pcall/xpcall issues with coroutines
|
|||
|
|
-- yielding inside the call to pcall or xpcall.
|
|||
|
|
--
|
|||
|
|
-- Authors: Roberto Ierusalimschy and Andre Carregal
|
|||
|
|
-- Contributors: Thomas Harning Jr., Ignacio Burgue<75>o, Fabio Mascarenhas
|
|||
|
|
--
|
|||
|
|
-- Copyright 2005 - Kepler Project (www.keplerproject.org)
|
|||
|
|
--
|
|||
|
|
-- $Id: coxpcall.lua,v 1.13 2008/05/19 19:20:02 mascarenhas Exp $
|
|||
|
|
-------------------------------------------------------------------------------
|
|||
|
|
|
|||
|
|
-- Lua 5.2 makes this module a no-op
|
|||
|
|
if _VERSION == "Lua 5.2" then
|
|||
|
|
copcall = pcall
|
|||
|
|
coxpcall = xpcall
|
|||
|
|
return { pcall = pcall, xpcall = xpcall }
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
-------------------------------------------------------------------------------
|
|||
|
|
-- Implements xpcall with coroutines
|
|||
|
|
-------------------------------------------------------------------------------
|
|||
|
|
local performResume, handleReturnValue
|
|||
|
|
local oldpcall, oldxpcall = pcall, xpcall
|
|||
|
|
local pack = table.pack or function(...) return {n = select("#", ...), ...} end
|
|||
|
|
local unpack = table.unpack or unpack
|
|||
|
|
|
|||
|
|
function handleReturnValue(err, co, status, ...)
|
|||
|
|
if not status then
|
|||
|
|
return false, err(debug.traceback(co, (...)), ...)
|
|||
|
|
end
|
|||
|
|
if coroutine.status(co) == 'suspended' then
|
|||
|
|
return performResume(err, co, coroutine.yield(...))
|
|||
|
|
else
|
|||
|
|
return true, ...
|
|||
|
|
end
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
function performResume(err, co, ...)
|
|||
|
|
return handleReturnValue(err, co, coroutine.resume(co, ...))
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
function coxpcall(f, err, ...)
|
|||
|
|
local res, co = oldpcall(coroutine.create, f)
|
|||
|
|
if not res then
|
|||
|
|
local params = pack(...)
|
|||
|
|
local newf = function() return f(unpack(params, 1, params.n)) end
|
|||
|
|
co = coroutine.create(newf)
|
|||
|
|
end
|
|||
|
|
return performResume(err, co, ...)
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
-------------------------------------------------------------------------------
|
|||
|
|
-- Implements pcall with coroutines
|
|||
|
|
-------------------------------------------------------------------------------
|
|||
|
|
|
|||
|
|
local function id(trace, ...)
|
|||
|
|
return ...
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
function copcall(f, ...)
|
|||
|
|
return coxpcall(f, id, ...)
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
return { pcall = copcall, xpcall = coxpcall }
|