-------------------------------------------------------------------------------
-- 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
local oldpcall = pcall

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 = { ... }
        local newf = function() return f(table.unpack(params)) end
        co = coroutine.create(newf)
    end
    return performResume(err, co, ...)
end

-------------------------------------------------------------------------------
-- Implements pcall with coroutines
-------------------------------------------------------------------------------

local function id(_, ...)
    return ...
end

function copcall(f, ...)
    return coxpcall(f, id, ...)
end