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into cffbc33e6d
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@ -234,6 +234,24 @@ function mesecon.tablecopy(obj) -- deep copy
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return obj
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end
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-- Performs a deep copy of a table, changing the environment of any functions.
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-- Adapted from the builtin table.copy() function.
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function mesecon.tablecopy_change_env(t, env, seen)
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local n = {}
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seen = seen or {}
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seen[t] = n
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for k, v in pairs(t) do
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if type(v) == "function" then
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setfenv(v, env)
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n[(type(k) == "table" and (seen[k] or mesecon.tablecopy_change_env(k, env, seen))) or k] = v
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else
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n[(type(k) == "table" and (seen[k] or mesecon.tablecopy_change_env(k, env, seen))) or k] =
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(type(v) == "table" and (seen[v] or mesecon.tablecopy_change_env(v, env, seen))) or v
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end
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end
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return n
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end
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-- Returns whether two values are equal.
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-- In tables, keys are compared for identity but values are compared recursively.
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-- There is no protection from infinite recursion.
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@ -479,6 +479,24 @@ local function get_digiline_send(pos, itbl, send_warning)
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end
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end
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-- Mods can place their own "libraries" in here to be loaded via require() from in a Luacontroller.
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-- These can take two different forms:
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-- Function (recommended for libraries adding new functionality): A function that, when called, returns something that will be passed to the LuaC code.
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-- Function signature is getlibrary(env, pos) where 'env' is the environment that the Luacontroller code is running in, and 'pos' is the position of the controller.
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-- Table (recommended for libraries containing mostly lookup tables): A table that will be copied, and the copy returned to the LuaC code.
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-- When using the table format, any functions in the table will have their environment changed to that of the Luacontroller.
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mesecon.luacontroller_libraries = {}
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local function get_require(pos, env)
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return function(name)
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if type(mesecon.luacontroller_libraries[name]) == "function" then
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return mesecon.luacontroller_libraries[name](env, pos)
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elseif type(mesecon.luacontroller_libraries[name]) == "table" then
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return mesecon.tablecopy_change_env(mesecon.luacontroller_libraries[name], env)
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end
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end
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end
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local safe_globals = {
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-- Don't add pcall/xpcall unless willing to deal with the consequences (unless very careful, incredibly likely to allow killing server indirectly)
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"assert", "error", "ipairs", "next", "pairs", "select",
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@ -572,6 +590,8 @@ local function create_environment(pos, mem, event, itbl, send_warning)
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for _, name in pairs(safe_globals) do
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env[name] = _G[name]
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end
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env.require = get_require(pos, env)
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return env
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end
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