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-rw-r--r--mesecons_luacontroller/init.lua303
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diff --git a/mesecons_luacontroller/init.lua b/mesecons_luacontroller/init.lua
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+-- Reference
+-- ports = get_real_portstates(pos): gets if inputs are powered from outside
+-- newport = merge_portstates(state1, state2): just does result = state1 or state2 for every port
+-- action_setports(pos, ports, vports): activates/deactivates the mesecons according to the portstates (helper for action)
+-- action(pos, ports): Applies new portstates to a luacontroller at pos
+-- update(pos): updates the controller at pos by executing the code
+-- reset_meta (pos, code, errmsg): performs a software-reset, installs new code and prints error messages
+-- reset (pos): performs a hardware reset, turns off all ports
+--
+-- The Sandbox
+-- The whole code of the controller runs in a sandbox,
+-- a very restricted environment.
+-- However, as this does not prevent you from using e.g. loops,
+-- we need to check for these prohibited commands first.
+-- Actually the only way to damage the server is to
+-- use too much memory from the sandbox.
+-- You can add more functions to the environment
+-- (see where local env is defined)
+-- Something nice to play is is appending minetest.env to it.
+
+local BASENAME = "mesecons_luacontroller:luacontroller"
+
+local rules = {}
+rules.a = {x = -1, y = 0, z = 0}
+rules.b = {x = 0, y = 0, z = 1}
+rules.c = {x = 1, y = 0, z = 0}
+rules.d = {x = 0, y = 0, z = -1}
+
+local get_real_portstates = function(pos) -- determine if ports are powered (by itself or from outside)
+ ports = {
+ a = mesecon:is_power_on(mesecon:addPosRule(pos, rules.a))
+ and mesecon:rules_link(mesecon:addPosRule(pos, rules.a), pos),
+ b = mesecon:is_power_on(mesecon:addPosRule(pos, rules.b))
+ and mesecon:rules_link(mesecon:addPosRule(pos, rules.b), pos),
+ c = mesecon:is_power_on(mesecon:addPosRule(pos, rules.c))
+ and mesecon:rules_link(mesecon:addPosRule(pos, rules.c), pos),
+ d = mesecon:is_power_on(mesecon:addPosRule(pos, rules.d))
+ and mesecon:rules_link(mesecon:addPosRule(pos, rules.d), pos),
+ }
+ return ports
+end
+
+local merge_portstates = function (ports, vports)
+ local npo = {a=false, b=false, c=false, d=false}
+ npo.a = vports.a or ports.a
+ npo.b = vports.b or ports.b
+ npo.c = vports.c or ports.c
+ npo.d = vports.d or ports.d
+ return npo
+end
+
+local action_setports = function (pos, ports, vports)
+ if vports.a ~= ports.a then
+ if ports.a then mesecon:receptor_on(pos, {rules.a})
+ else mesecon:receptor_off(pos, {rules.a}) end
+ end
+ if vports.b ~= ports.b then
+ if ports.b then mesecon:receptor_on(pos, {rules.b})
+ else mesecon:receptor_off(pos, {rules.b}) end
+ end
+ if vports.c ~= ports.c then
+ if ports.c then mesecon:receptor_on(pos, {rules.c})
+ else mesecon:receptor_off(pos, {rules.c}) end
+ end
+ if vports.d ~= ports.d then
+ if ports.d then mesecon:receptor_on(pos, {rules.d})
+ else mesecon:receptor_off(pos, {rules.d}) end
+ end
+end
+
+local action = function (pos, ports)
+ local vports = minetest.registered_nodes[minetest.env:get_node(pos).name].virtual_portstates;
+ local name = BASENAME
+ ..tonumber(ports.d and 1 or 0)
+ ..tonumber(ports.c and 1 or 0)
+ ..tonumber(ports.b and 1 or 0)
+ ..tonumber(ports.a and 1 or 0)
+ mesecon:swap_node(pos, name)
+
+ action_setports (pos, ports, vports)
+end
+
+-- Overheat Stuff
+local heat = function (meta) -- warm up
+ h = meta:get_int("heat")
+ if h ~= nil then
+ meta:set_int("heat", h + 1)
+ end
+end
+
+local cool = function (meta) -- cool down after a while
+ h = meta:get_int("heat")
+ if h ~= nil then
+ meta:set_int("heat", h - 1)
+ end
+end
+
+local overheat = function (meta) -- determine if too hot
+ h = meta:get_int("heat")
+ if h == nil then return true end -- if nil then overheat
+ if h > 30 then
+ return true
+ else
+ return false
+ end
+end
+
+local overheat_off = function(pos)
+ rules = mesecon:get_rules("mesecons_microcontroller:microcontroller1111")
+ mesecon:receptor_off(pos, rules)
+end
+
+local update = function (pos)
+ local meta = minetest.env:get_meta(pos)
+ code = meta:get_string("code")
+
+ -- Clean code
+ local prohibited = {"while", "for", "repeat", "until"}
+ for _, p in ipairs(prohibited) do
+ if string.find(code, p) then
+ return "Prohibited command: "..p
+ end
+ end
+
+ -- Gather variables for the environment
+ local vports = minetest.registered_nodes[minetest.env:get_node(pos).name].virtual_portstates
+ vports = {a = vports.a, b = vports.b, c = vports.c, d = vports.d}
+ local rports = get_real_portstates(pos)
+
+ local env = { print = print,
+ selfpos = pos,
+ dump = dump,
+ pin = merge_portstates(vports, rports),
+ port = vports}
+
+ -- Create Sandbox
+ if code:byte(1) == 27 then
+ return "You Hacker You! Don't use binary code!"
+ end
+ local f, msg = loadstring(code)
+ if not f then return msg end
+ setfenv(f, env)
+ success, msg = pcall(f)
+
+ -- Overheat protection
+ heat(meta)
+ minetest.after(0.5, cool, meta)
+ if overheat(meta) then
+ minetest.env:remove_node(pos)
+ minetest.after(0.2, overheat_off, pos) -- wait for pending operations
+ minetest.env:add_item(pos, BASENAME.."0000")
+ return
+ end
+
+ -- Actually set the ports
+ if not success then
+ return msg
+ else
+ action(pos, env.port)
+ end
+end
+
+local reset_meta = function(pos, code, errmsg)
+ local meta = minetest.env:get_meta(pos)
+ code = code or "";
+ errmsg = errmsg or "";
+ errmsg = string.gsub(errmsg, "%[", "(") -- would otherwise
+ errmsg = string.gsub(errmsg, "%]", ")") -- corrupt formspec
+ meta:set_string("code", code)
+ meta:set_string("formspec", "size[10,8]"..
+ "textarea[0.2,0.4;10.2,5;code;Code:;"..code.."]"..
+ "button[3.5,7.5;2,0;program;Program]"..
+ "image_button_exit[9.62,-0.35;0.7,0.7;jeija_close_window.png;exit;]"..
+ "label[0.1,4.5;"..errmsg.."]")
+ meta:set_int("heat", 0)
+end
+
+local reset = function (pos)
+ action(pos, {a=false, b=false, c=false, d=false})
+end
+
+-- ______
+-- |
+-- | | |
+-- |___| | __ ___ _ __ _ _
+-- | | | | |\ | | |_| | | | | |_ |_|
+-- | |______ |__| | \| | | \ |__| |_ |_ |_ |\
+--
+-- Actually register all the stuff:
+
+for a = 0, 1 do
+for b = 0, 1 do
+for c = 0, 1 do
+for d = 0, 1 do
+local nodename = BASENAME..tostring(d)..tostring(c)..tostring(b)..tostring(a)
+local top = "jeija_luacontroller_top.png"
+if a == 1 then
+ top = top.."^jeija_luacontroller_LED_A.png"
+end
+if b == 1 then
+ top = top.."^jeija_luacontroller_LED_B.png"
+end
+if c == 1 then
+ top = top.."^jeija_luacontroller_LED_C.png"
+end
+if d == 1 then
+ top = top.."^jeija_luacontroller_LED_D.png"
+end
+
+if a + b + c + d ~= 0 then
+ groups = {dig_immediate=2, not_in_creative_inventory=1}
+else
+ groups = {dig_immediate=2}
+end
+
+local output_rules={}
+if (a == 1) then table.insert(output_rules, rules.a) end
+if (b == 1) then table.insert(output_rules, rules.b) end
+if (c == 1) then table.insert(output_rules, rules.c) end
+if (d == 1) then table.insert(output_rules, rules.d) end
+
+local input_rules={}
+if (a == 0) then table.insert(input_rules, rules.a) end
+if (b == 0) then table.insert(input_rules, rules.b) end
+if (c == 0) then table.insert(input_rules, rules.c) end
+if (d == 0) then table.insert(input_rules, rules.d) end
+
+local mesecons = {effector =
+{
+ rules = input_rules,
+ action_change = function (pos)
+ update(pos)
+ end
+}}
+if nodename ~= BASENAME.."0000" then
+ mesecons.receptor = {
+ state = mesecon.state.on,
+ rules = output_rules
+ }
+end
+
+local nodebox = {
+ type = "fixed",
+ fixed = {
+ { -8/16, -8/16, -8/16, 8/16, -7/16, 8/16 }, -- bottom slab
+ { -5/16, -7/16, -5/16, 5/16, -6/16, 5/16 }, -- circuit board
+ { -3/16, -6/16, -3/16, 3/16, -5/16, 3/16 }, -- IC
+ }
+ }
+
+local selectionbox = {
+ type = "fixed",
+ fixed = { -8/16, -8/16, -8/16, 8/16, -5/16, 8/16 },
+ }
+
+minetest.register_node(nodename, {
+ description = "Luacontroller",
+ drawtype = "nodebox",
+ tiles = {
+ top,
+ "jeija_microcontroller_bottom.png",
+ "jeija_microcontroller_sides.png",
+ "jeija_microcontroller_sides.png",
+ "jeija_microcontroller_sides.png",
+ "jeija_microcontroller_sides.png"
+ },
+
+ paramtype = "light",
+ groups = groups,
+ drop = BASENAME.."0000",
+ sunlight_propagates = true,
+ selection_box = selectionbox,
+ node_box = nodebox,
+ on_construct = reset_meta,
+ on_receive_fields = function(pos, formname, fields)
+ reset(pos)
+ reset_meta(pos, fields.code)
+ local err = update(pos)
+ if err then print(err) end
+ reset_meta(pos, fields.code, err)
+ end,
+ mesecons = mesecons,
+ virtual_portstates = { a = a == 1, -- virtual portstates are
+ b = b == 1, -- the ports the the
+ c = c == 1, -- controller powers itself
+ d = d == 1},-- so those that light up
+ after_dig_node = function (pos, node)
+ mesecon:receptor_off(pos, output_rules)
+ end,
+})
+end
+end
+end
+end
+
+minetest.register_craft({
+ output = BASENAME.."0000 2",
+ recipe = {
+ {'mesecons_materials:silicon', 'mesecons_materials:silicon', 'group:mesecon_conductor_craftable'},
+ {'mesecons_materials:silicon', 'mesecons_materials:silicon', 'group:mesecon_conductor_craftable'},
+ {'group:mesecon_conductor_craftable', 'group:mesecon_conductor_craftable', ''},
+ }
+})