Subversion Repositories WoWGM

--

-- strict.lua

-- checks uses of undeclared global variables

-- All global variables must be 'declared' through a regular assignment

-- (even assigning nil will do) in a main chunk before being used

-- anywhere or assigned to inside a function.

--

local mt = getmetatable(_G)

if mt == nil then

  mt = {}

  setmetatable(_G, mt)

end

mt.__declared = {}

mt.__newindex = function (t, n, v)

  if not mt.__declared[n] then

    local w = debug.getinfo(2, "S").what

    if w ~= "main" and w ~= "C" then

      error("assign to undeclared variable '"..n.."'", 2)

    end

    mt.__declared[n] = true

  end

  rawset(t, n, v)

end

mt.__index = function (t, n)

  if not mt.__declared[n] and debug.getinfo(2, "S").what ~= "C" then

    error("variable '"..n.."' is not declared", 2)

  end

  return rawget(t, n)

end