454 lines
13 KiB
Lua
454 lines
13 KiB
Lua
-- Reference
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-- ports = get_real_portstates(pos): gets if inputs are powered from outside
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-- newport = merge_portstates(state1, state2): just does result = state1 or state2 for every port
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-- action_setports(pos, ports, vports): activates/deactivates the mesecons according to the portstates (helper for action)
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-- action(pos, ports): Applies new portstates to a luacontroller at pos
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-- lc_update(pos): updates the controller at pos by executing the code
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-- reset_meta (pos, code, errmsg): performs a software-reset, installs new code and prints error messages
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-- reset (pos): performs a hardware reset, turns off all ports
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--
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-- The Sandbox
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-- The whole code of the controller runs in a sandbox,
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-- a very restricted environment.
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-- However, as this does not prevent you from using e.g. loops,
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-- we need to check for these prohibited commands first.
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-- Actually the only way to damage the server is to
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-- use too much memory from the sandbox.
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-- You can add more functions to the environment
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-- (see where local env is defined)
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-- Something nice to play is is appending minetest.env to it.
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local BASENAME = "mesecons_luacontroller:luacontroller"
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local rules = {}
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rules.a = {x = -1, y = 0, z = 0, name="A"}
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rules.b = {x = 0, y = 0, z = 1, name="B"}
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rules.c = {x = 1, y = 0, z = 0, name="C"}
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rules.d = {x = 0, y = 0, z = -1, name="D"}
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------------------
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-- Action stuff --
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------------------
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-- These helpers are required to set the portstates of the luacontroller
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local get_real_portstates = function(pos) -- determine if ports are powered (by itself or from outside)
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ports = {
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a = mesecon:is_power_on(mesecon:addPosRule(pos, rules.a))
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and mesecon:rules_link(mesecon:addPosRule(pos, rules.a), pos),
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b = mesecon:is_power_on(mesecon:addPosRule(pos, rules.b))
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and mesecon:rules_link(mesecon:addPosRule(pos, rules.b), pos),
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c = mesecon:is_power_on(mesecon:addPosRule(pos, rules.c))
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and mesecon:rules_link(mesecon:addPosRule(pos, rules.c), pos),
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d = mesecon:is_power_on(mesecon:addPosRule(pos, rules.d))
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and mesecon:rules_link(mesecon:addPosRule(pos, rules.d), pos),
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}
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return ports
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end
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local merge_portstates = function (ports, vports)
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local npo = {a=false, b=false, c=false, d=false}
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npo.a = vports.a or ports.a
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npo.b = vports.b or ports.b
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npo.c = vports.c or ports.c
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npo.d = vports.d or ports.d
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return npo
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end
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local generate_name = function (ports, overwrite)
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local overwrite = overwrite or {}
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local d = overwrite.d or (ports.d and 1 or 0)
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local c = overwrite.c or (ports.c and 1 or 0)
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local b = overwrite.b or (ports.b and 1 or 0)
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local a = overwrite.a or (ports.a and 1 or 0)
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return BASENAME..d..c..b..a
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end
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local setport = function (pos, rule, ignore, state, ports)
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local ignorename = generate_name(ports, ignore)
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mesecon:swap_node(pos, ignorename)
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if state then
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mesecon:receptor_on(pos, {rule})
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else
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mesecon:receptor_off(pos, {rule})
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end
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if minetest.env:get_node(pos).name ~= ignorename then
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return true -- overridden by second process
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end
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return false -- success
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end
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local action = function (pos, ports, forcereset)
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local name = minetest.env:get_node(pos).name
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local vports = minetest.registered_nodes[name].virtual_portstates
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local newname = generate_name(ports)
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if name ~= newname and vports then
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local rules_on = {}
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local rules_off = {}
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local ignore = {}
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local interrupted
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if ports.a ~= vports.a then interrupted = setport(pos, rules.a, {a = 2}, ports.a, ports) end
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if interrupted and not forcereset then return end
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if ports.b ~= vports.b then interrupted = setport(pos, rules.b, {b = 2}, ports.b, ports) end
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if interrupted and not forcereset then return end
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if ports.c ~= vports.c then interrupted = setport(pos, rules.c, {c = 2}, ports.c, ports) end
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if interrupted and not forcereset then return end
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if ports.d ~= vports.d then interrupted = setport(pos, rules.d, {d = 2}, ports.d, ports) end
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if interrupted and not forcereset then return end
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mesecon:swap_node(pos, newname)
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end
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end
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local delayedaction = function (params)
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action(params.pos, params.ports)
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end
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--------------------
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-- Overheat stuff --
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--------------------
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local heat = function (meta) -- warm up
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h = meta:get_int("heat")
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if h ~= nil then
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meta:set_int("heat", h + 1)
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end
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end
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local cool = function (meta) -- cool down after a while
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h = meta:get_int("heat")
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if h ~= nil then
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meta:set_int("heat", h - 1)
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end
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end
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local overheat = function (meta) -- determine if too hot
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h = meta:get_int("heat")
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if h == nil then return true end -- if nil then overheat
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if h > 20 then
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return true
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else
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return false
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end
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end
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local overheat_off = function(pos)
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mesecon:receptor_off(pos, mesecon.rules.flat)
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end
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-------------------
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-- Parsing stuff --
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-------------------
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local code_prohibited = function(code)
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-- Clean code
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local prohibited = {"while", "for", "repeat", "until", "function"}
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for _, p in ipairs(prohibited) do
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if string.find(code, p) then
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return "Prohibited command: "..p
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end
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end
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end
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local safeprint = function(param)
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print(dump(param))
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end
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local interrupt = function(params)
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lc_update(params.pos, {type="interrupt", iid = params.iid})
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end
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local getinterrupt = function(pos)
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local interrupt = function (time, iid) -- iid = interrupt id
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if type(time) ~= "number" then return end
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local iid = iid or math.random()
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local meta = minetest.env:get_meta(pos)
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local interrupts = minetest.deserialize(meta:get_string("lc_interrupts")) or {}
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table.insert (interrupts, iid)
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meta:set_string("lc_interrupts", minetest.serialize(interrupts))
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minetest.after(time, interrupt, {pos=pos, iid = iid})
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end
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return interrupt
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end
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local getdigiline_send = function (pos)
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local digiline_send = function (channel, msg)
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if digiline then
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digiline:receptor_send(pos, digiline.rules.default, channel, msg)
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end
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end
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return digiline_send
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end
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local create_environment = function(pos, mem, event)
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-- Gather variables for the environment
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local vports = minetest.registered_nodes[minetest.env:get_node(pos).name].virtual_portstates
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vports = {a = vports.a, b = vports.b, c = vports.c, d = vports.d}
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local rports = get_real_portstates(pos)
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return { print = safeprint,
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pin = merge_portstates(vports, rports),
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port = vports,
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interrupt = getinterrupt(pos),
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digiline_send = getdigiline_send(pos),
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mem = mem,
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tostring = tostring,
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tonumber = tonumber,
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string = string,
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event = event}
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end
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local create_sandbox = function (code, env)
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-- Create Sandbox
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if code:byte(1) == 27 then
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return _, "You Hacker You! Don't use binary code!"
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end
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f, msg = loadstring(code)
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if not f then return _, msg end
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setfenv(f, env)
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return f
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end
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local do_overheat = function (pos, meta)
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-- Overheat protection
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heat(meta)
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minetest.after(0.5, cool, meta)
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if overheat(meta) then
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minetest.env:remove_node(pos)
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minetest.after(0.2, overheat_off, pos) -- wait for pending operations
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minetest.env:add_item(pos, BASENAME.."0000")
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return true
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end
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end
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local load_memory = function(meta)
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return minetest.deserialize(meta:get_string("lc_memory")) or {}
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end
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local save_memory = function(meta, mem)
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meta:set_string("lc_memory", minetest.serialize(mem))
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end
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local interrupt_allow = function (meta, event)
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if event.type ~= "interrupt" then return true end
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local interrupts = minetest.deserialize(meta:get_string("lc_interrupts")) or {}
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for _, i in ipairs(interrupts) do
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if minetest.serialize(i) == minetest.serialize(event.iid) then
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return true
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end
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end
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return false
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end
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local ports_invalid = function (var)
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if type(var) == "table" then
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return false
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end
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return "The ports you set are invalid"
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end
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----------------------
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-- Parsing function --
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----------------------
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lc_update = function (pos, event)
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local meta = minetest.env:get_meta(pos)
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if not interrupt_allow(meta, event) then return end
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if do_overheat(pos, meta) then return end
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-- load code & mem from memory
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local mem = load_memory(meta)
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local code = meta:get_string("code")
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-- make sure code is ok and create environment
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local prohibited = code_prohibited(code)
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if prohibited then return prohibited end
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local env = create_environment(pos, mem, event)
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-- create the sandbox and execute code
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local chunk, msg = create_sandbox (code, env)
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if not chunk then return msg end
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local success, msg = pcall(f)
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if not success then return msg end
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if ports_invalid(env.port) then return ports_invalid(env.port) end
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save_memory(meta, mem)
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-- Actually set the ports
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minetest.after(0, delayedaction, {pos = pos, ports = env.port})
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end
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local reset_meta = function(pos, code, errmsg)
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local meta = minetest.env:get_meta(pos)
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code = code or "";
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errmsg = errmsg or "";
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errmsg = string.gsub(errmsg, "%[", "(") -- would otherwise
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errmsg = string.gsub(errmsg, "%]", ")") -- corrupt formspec
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meta:set_string("code", code)
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meta:set_string("formspec", "size[10,8]"..
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"background[-0.2,-0.25;10.4,8.75;jeija_luac_background.png]"..
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"textarea[0.2,0.6;10.2,5;code;;"..code.."]"..
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"image_button[3.75,6;2.5,1;jeija_luac_runbutton.png;program;]"..
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"image_button_exit[9.72,-0.25;0.425,0.4;jeija_close_window.png;exit;]"..
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"label[0.1,5;"..errmsg.."]")
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meta:set_int("heat", 0)
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end
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local reset = function (pos)
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minetest.env:get_meta(pos):set_string("lc_interrupts", "")
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action(pos, {a=false, b=false, c=false, d=false}, true)
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end
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-- ______
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-- |
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-- | | |
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-- |___| | __ ___ _ __ _ _
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-- | | | | |\ | | |_| | | | | |_ |_|
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-- | |______ |__| | \| | | \ |__| |_ |_ |_ |\
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--
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-----------------------
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-- Node Registration --
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-----------------------
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local output_rules={}
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local input_rules={}
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local nodebox = {
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type = "fixed",
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fixed = {
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{ -8/16, -8/16, -8/16, 8/16, -7/16, 8/16 }, -- bottom slab
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{ -5/16, -7/16, -5/16, 5/16, -6/16, 5/16 }, -- circuit board
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{ -3/16, -6/16, -3/16, 3/16, -5/16, 3/16 }, -- IC
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}
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}
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local selectionbox = {
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type = "fixed",
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fixed = { -8/16, -8/16, -8/16, 8/16, -5/16, 8/16 },
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}
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local digiline = {
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receptor = {},
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effector = {
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action = function (pos, node, channel, msg)
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lc_update (pos, {type = "digiline", channel = channel, msg = msg})
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end
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}
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}
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for a = 0, 2 do -- 0 = off; 1 = on; 2 = ignore
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for b = 0, 2 do
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for c = 0, 2 do
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for d = 0, 2 do
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local cid = tostring(d)..tostring(c)..tostring(b)..tostring(a)
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local nodename = BASENAME..cid
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local top = "jeija_luacontroller_top.png"
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if a == 1 then
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top = top.."^jeija_luacontroller_LED_A.png"
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end
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if b == 1 then
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top = top.."^jeija_luacontroller_LED_B.png"
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end
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if c == 1 then
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top = top.."^jeija_luacontroller_LED_C.png"
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end
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if d == 1 then
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top = top.."^jeija_luacontroller_LED_D.png"
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end
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if a + b + c + d ~= 0 then
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groups = {dig_immediate=2, not_in_creative_inventory=1}
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else
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groups = {dig_immediate=2}
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end
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output_rules[cid] = {}
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input_rules[cid] = {}
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if (a == 1) then table.insert(output_rules[cid], rules.a) end
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if (b == 1) then table.insert(output_rules[cid], rules.b) end
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if (c == 1) then table.insert(output_rules[cid], rules.c) end
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if (d == 1) then table.insert(output_rules[cid], rules.d) end
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if (a == 0) then table.insert(input_rules[cid], rules.a) end
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if (b == 0) then table.insert(input_rules[cid], rules.b) end
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if (c == 0) then table.insert(input_rules[cid], rules.c) end
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if (d == 0) then table.insert(input_rules[cid], rules.d) end
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local mesecons = {
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effector =
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{
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rules = input_rules[cid],
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action_change = function (pos, _, rulename, newstate)
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lc_update(pos, {type=newstate, pin=rulename})
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end,
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},
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receptor =
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{
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state = mesecon.state.on,
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rules = output_rules[cid]
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}
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}
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minetest.register_node(nodename, {
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description = "Luacontroller",
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drawtype = "nodebox",
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tiles = {
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top,
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"jeija_microcontroller_bottom.png",
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"jeija_microcontroller_sides.png",
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"jeija_microcontroller_sides.png",
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"jeija_microcontroller_sides.png",
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"jeija_microcontroller_sides.png"
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},
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inventory_image = top,
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paramtype = "light",
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groups = groups,
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drop = BASENAME.."0000",
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sunlight_propagates = true,
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selection_box = selectionbox,
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node_box = nodebox,
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on_construct = reset_meta,
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on_receive_fields = function(pos, formname, fields)
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reset(pos)
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reset_meta(pos, fields.code)
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local err = lc_update(pos, {type="program"})
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if err then print(err) end
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reset_meta(pos, fields.code, err)
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end,
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sounds = default.node_sound_stone_defaults(),
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mesecons = mesecons,
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digiline = digiline,
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is_luacontroller = true,
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virtual_portstates = { a = a == 1, -- virtual portstates are
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b = b == 1, -- the ports the the
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c = c == 1, -- controller powers itself
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d = d == 1},-- so those that light up
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after_dig_node = function (pos, node)
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mesecon:receptor_off(pos, output_rules)
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end,
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})
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end
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end
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end
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end
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------------------------
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-- Craft Registration --
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------------------------
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minetest.register_craft({
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output = BASENAME.."0000 2",
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recipe = {
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{'mesecons_materials:silicon', 'mesecons_materials:silicon', 'group:mesecon_conductor_craftable'},
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{'mesecons_materials:silicon', 'mesecons_materials:silicon', 'group:mesecon_conductor_craftable'},
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{'group:mesecon_conductor_craftable', 'group:mesecon_conductor_craftable', ''},
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}
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})
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