honeylisp/vendor/lite/data/core/strict.lua

27 lines
441 B
Lua

local strict = {}
strict.defined = {}
-- used to define a global variable
function global(t)
for k, v in pairs(t) do
strict.defined[k] = true
rawset(_G, k, v)
end
end
function strict.__newindex(t, k, v)
error("cannot set undefined variable: " .. k, 2)
end
function strict.__index(t, k)
if not strict.defined[k] and k ~= nil then
error("cannot get undefined variable: " .. k, 2)
end
end
setmetatable(_G, strict)