miduo_client/Assets/ManagedResources/~Lua/misc/strict.lua

41 lines
1.0 KiB
Lua

--
-- 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.
--
-- modified for better compatibility with LuaJIT, see:
-- http://www.freelists.org/post/luajit/strictlua-with-stripped-bytecode
local getinfo, error, rawset, rawget = debug.getinfo, error, rawset, rawget
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 info = getinfo(2, "S")
if info and info.linedefined > 0 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] then
local info = getinfo(2, "S")
if info and info.linedefined > 0 then
error("variable '"..n.."' is not declared", 2)
end
end
return rawget(t, n)
end