-- Copyright 2007-2011 Mitchell mitchell<att>caladbolg.net. See LICENSE.

-- When using LuaJIT try to retain backwards compatibility (Lua 5.1).
-- LuaJIT is compiled with LUAJIT_ENABLE_LUA52COMPAT for some Lua 5.2 features.

-- In Lua 5.1, `xpcall` did not accept function arguments.
local xpcall51 = xpcall
function xpcall(f, error, ...)
  local args = {...}
  return xpcall51(function() return f(unpack(args)) end, error)
end

-- In Lua 5.1, `load` did not take mode and environment parameters.
local load51 = load
function load(ld, source, mode, env)
  local f, err = load51(ld, source)
  if f and env then return setfenv(f, env) end
  return f, err
end