minetest-mods/mesecons
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mesecons/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
-- lc_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, name="A"}
rules.b = {x = 0, y = 0, z = 1, name="B"}
rules.c = {x = 1, y = 0, z = 0, name="C"}
rules.d = {x = 0, y = 0, z = -1, name="D"}
------------------
-- Action stuff --
------------------
-- These helpers are required to set the portstates of the luacontroller
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 generate_name = function (ports, overwrite)
local overwrite = overwrite or {}
local d = overwrite.d or (ports.d and 1 or 0)
local c = overwrite.d or (ports.c and 1 or 0)
local b = overwrite.d or (ports.b and 1 or 0)
local a = overwrite.d or (ports.a and 1 or 0)
return BASENAME..d..c..b..a
end
local setport = function (pos, rule, ignore, state, ports)
local ignorename = generate_name(ports, ignore)
mesecon:swap_node(pos, ignorename)
if state then
mesecon:receptor_on(pos, {rule})
else
mesecon:receptor_off(pos, {rule})
end
if minetest.env:get_node(pos).name ~= ignorename then
return true -- overridden by second process
end
return false -- success
end
local action = function (pos, ports, forcereset)
local name = minetest.env:get_node(pos).name
local vports = minetest.registered_nodes[name].virtual_portstates
local newname = generate_name(ports)
if name ~= newname and vports then
local rules_on = {}
local rules_off = {}
local ignore = {}
local interrupted
if ports.a ~= vports.a then interrupted = setport(pos, rules.a, {a = 2}, ports.a, ports) end
if interrupted and not forcereset then return end
if ports.b ~= vports.b then interrupted = setport(pos, rules.b, {b = 2}, ports.b, ports) end
if interrupted and not forcereset then return end
if ports.c ~= vports.c then interrupted = setport(pos, rules.c, {c = 2}, ports.c, ports) end
if interrupted and not forcereset then return end
if ports.d ~= vports.d then interrupted = setport(pos, rules.d, {d = 2}, ports.d, ports) end
if interrupted and not forcereset then return end
mesecon:swap_node(pos, newname)
end
end
local delayedaction = function (params)
action(params.pos, params.ports)
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 > 20 then
return true
else
return false
end
end
local overheat_off = function(pos)
mesecon:receptor_off(pos, mesecon.rules.flat)
end
-------------------
-- Parsing stuff --
-------------------
local code_prohibited = function(code)
-- Clean code
local prohibited = {"while", "for", "repeat", "until", "function"}
for _, p in ipairs(prohibited) do
if string.find(code, p) then
return "Prohibited command: "..p
end
end
end
local safeprint = function(param)
print(dump(param))
end
local interrupt = function(params)
lc_update(params.pos, {type="interrupt", iid = params.iid})
end
local getinterrupt = function(pos)
local interrupt = function (time, iid) -- iid = interrupt id
if type(time) ~= "number" then return end
local meta = minetest.env:get_meta(pos)
local interrupts = minetest.deserialize(meta:get_string("lc_interrupts")) or {}
table.insert (interrupts, iid or 0)
meta:set_string("lc_interrupts", minetest.serialize(interrupts))
minetest.after(time, interrupt, {pos=pos, iid = iid})
end
return interrupt
end
local getdigiline_send = function (pos)
local digiline_send = function (channel, msg)
if digiline then
digiline:receptor_send(pos, digiline.rules.default, channel, msg)
end
end
return digiline_send
end
local create_environment = function(pos, mem, event)
-- 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)
return { print = safeprint,
pin = merge_portstates(vports, rports),
port = vports,
interrupt = getinterrupt(pos),
digiline_send = getdigiline_send(pos),
mem = mem,
tostring = tostring,
tonumber = tonumber,
string = string,
event = event}
end
local create_sandbox = function (code, env)
-- Create Sandbox
if code:byte(1) == 27 then
return _, "You Hacker You! Don't use binary code!"
end
f, msg = loadstring(code)
if not f then return _, msg end
setfenv(f, env)
return f
end
local do_overheat = function (pos, meta)
-- 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 true
end
end
local load_memory = function(meta)
return minetest.deserialize(meta:get_string("lc_memory")) or {}
end
local save_memory = function(meta, mem)
meta:set_string("lc_memory", minetest.serialize(mem))
end
local interrupt_allow = function (meta, event)
if event.type ~= "interrupt" then return true end
local interrupts = minetest.deserialize(meta:get_string("lc_interrupts")) or {}
for _, i in ipairs(interrupts) do
if minetest.serialize(i) == minetest.serialize(event.iid) then
return true
end
end
return false
end
local ports_invalid = function (var)
if type(var) == "table" then
return false
end
return "The ports you set are invalid"
end
----------------------
-- Parsing function --
----------------------
lc_update = function (pos, event)
local meta = minetest.env:get_meta(pos)
if not interrupt_allow(meta, event) then return end
if do_overheat(pos, meta) then return end
-- load code & mem from memory
local mem = load_memory(meta)
local code = meta:get_string("code")
-- make sure code is ok and create environment
local prohibited = code_prohibited(code)
if prohibited then return prohibited end
local env = create_environment(pos, mem, event)
-- create the sandbox and execute code
local chunk, msg = create_sandbox (code, env)
if not chunk then return msg end
local success, msg = pcall(f)
if not success then return msg end
if ports_invalid(env.port) then return ports_invalid(env.port) end
save_memory(meta, mem)
-- Actually set the ports
minetest.after(0, delayedaction, {pos = pos, ports = env.port})
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]"..
"background[-0.2,-0.25;10.4,8.75;jeija_luac_background.png]"..
"textarea[0.2,0.6;10.2,5;code;;"..code.."]"..
"image_button[3.75,6;2.5,1;jeija_luac_runbutton.png;program;]"..
"image_button_exit[9.72,-0.25;0.425,0.4;jeija_close_window.png;exit;]"..
"label[0.1,5;"..errmsg.."]")
meta:set_int("heat", 0)
end
local reset = function (pos)
action(pos, {a=false, b=false, c=false, d=false}, true)
end
-- ______
-- |
-- | | |
-- |___| | __ ___ _ __ _ _
-- | | | | |\ | | |_| | | | | |_ |_|
-- | |______ |__| | \| | | \ |__| |_ |_ |_ |\
--
-----------------------
-- Node Registration --
-----------------------
local output_rules={}
local input_rules={}
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 },
}
local digiline = {
receptor = {},
effector = {
action = function (pos, node, channel, msg)
lc_update (pos, {type = "digiline", channel = channel, msg = msg})
end
}
}
for a = 0, 2 do -- 0 = off; 1 = on; 2 = ignore
for b = 0, 2 do
for c = 0, 2 do
for d = 0, 2 do
local cid = tostring(d)..tostring(c)..tostring(b)..tostring(a)
local nodename = BASENAME..cid
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
output_rules[cid] = {}
input_rules[cid] = {}
if (a == 1) then table.insert(output_rules[cid], rules.a) end
if (b == 1) then table.insert(output_rules[cid], rules.b) end
if (c == 1) then table.insert(output_rules[cid], rules.c) end
if (d == 1) then table.insert(output_rules[cid], rules.d) end
if (a == 0) then table.insert(input_rules[cid], rules.a) end
if (b == 0) then table.insert(input_rules[cid], rules.b) end
if (c == 0) then table.insert(input_rules[cid], rules.c) end
if (d == 0) then table.insert(input_rules[cid], rules.d) end
local mesecons = {
effector =
{
rules = input_rules[cid],
action_change = function (pos, _, rulename, newstate)
lc_update(pos, {type=newstate, pin=rulename})
end,
},
receptor =
{
state = mesecon.state.on,
rules = output_rules[cid]
}
}
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 = lc_update(pos, {type="program"})
if err then print(err) end
reset_meta(pos, fields.code, err)
end,
mesecons = mesecons,
digiline = digiline,
is_luacontroller = true,
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
------------------------
-- Craft Registration --
------------------------
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', ''},
}
})
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