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Code Issues Releases Wiki Activity

Strict Globals (#583)

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Lupus590 2020-11-21 12:11:40 +00:00 committed by GitHub
parent c35707725f
commit 9a749642d2
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1 changed files with 15 additions and 0 deletions
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15
src/main/resources/data/computercraft/lua/bios.lua
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@ -523,6 +523,16 @@ function os.run(_tEnv, _sPath, ...)
local tEnv = _tEnv
setmetatable(tEnv, { __index = _G })
if settings.get("bios.strict_globals", false) then
-- load will attempt to set _ENV on this environment, which
-- throws an error with this protection enabled. Thus we set it here first.
tEnv._ENV = tEnv
getmetatable(tEnv).__newindex = function(_, name)
error("Attempt to create global " .. tostring(name), 2)
end
end
local fnFile, err = loadfile(_sPath, nil, tEnv)
if fnFile then
local ok, err = pcall(fnFile, ...)
@ -954,6 +964,11 @@ settings.define("lua.function_source", {
description = "Show where a function was defined when printing functions.",
type = "boolean",
})
settings.define("bios.strict_globals", {
default = false,
description = "Prevents assigning variables into a program's environment. Make sure you use the local keyword or assign to _G explicitly.",
type = "boolean",
})
if term.isColour() then
settings.define("bios.use_multishell", {