mesecons/mesecons/internal.lua

625 lines
20 KiB
Lua

-- Internal.lua - The core of mesecons
--
-- For more practical developer resources see http://mesecons.net/developers.php
--
-- Function overview
-- mesecon.get_effector(nodename) --> Returns the mesecons.effector -specifictation in the nodedef by the nodename
-- mesecon.get_receptor(nodename) --> Returns the mesecons.receptor -specifictation in the nodedef by the nodename
-- mesecon.get_conductor(nodename) --> Returns the mesecons.conductor-specifictation in the nodedef by the nodename
-- mesecon.get_any_inputrules (node) --> Returns the rules of a node if it is a conductor or an effector
-- mesecon.get_any_outputrules (node) --> Returns the rules of a node if it is a conductor or a receptor
-- RECEPTORS
-- mesecon.is_receptor(nodename) --> Returns true if nodename is a receptor
-- mesecon.is_receptor_on(nodename) --> Returns true if nodename is an receptor with state = mesecon.state.on
-- mesecon.is_receptor_off(nodename) --> Returns true if nodename is an receptor with state = mesecon.state.off
-- mesecon.receptor_get_rules(node) --> Returns the rules of the receptor (mesecon.rules.default if none specified)
-- EFFECTORS
-- mesecon.is_effector(nodename) --> Returns true if nodename is an effector
-- mesecon.is_effector_on(nodename) --> Returns true if nodename is an effector with nodedef.mesecons.effector.action_off
-- mesecon.is_effector_off(nodename) --> Returns true if nodename is an effector with nodedef.mesecons.effector.action_on
-- mesecon.effector_get_rules(node) --> Returns the input rules of the effector (mesecon.rules.default if none specified)
-- SIGNALS
-- mesecon.activate(pos, node, depth) --> Activates the effector node at the specific pos (calls nodedef.mesecons.effector.action_on), higher depths are executed later
-- mesecon.deactivate(pos, node, depth) --> Deactivates the effector node at the specific pos (calls nodedef.mesecons.effector.action_off), higher depths are executed later
-- mesecon.changesignal(pos, node, rulename, newstate, depth) --> Changes the effector node at the specific pos (calls nodedef.mesecons.effector.action_change), higher depths are executed later
-- CONDUCTORS
-- mesecon.is_conductor(nodename) --> Returns true if nodename is a conductor
-- mesecon.is_conductor_on(node --> Returns true if node is a conductor with state = mesecon.state.on
-- mesecon.is_conductor_off(node) --> Returns true if node is a conductor with state = mesecon.state.off
-- mesecon.get_conductor_on(node_off) --> Returns the onstate nodename of the conductor
-- mesecon.get_conductor_off(node_on) --> Returns the offstate nodename of the conductor
-- mesecon.conductor_get_rules(node) --> Returns the input+output rules of a conductor (mesecon.rules.default if none specified)
-- HIGH-LEVEL Internals
-- mesecon.is_power_on(pos) --> Returns true if pos emits power in any way
-- mesecon.is_power_off(pos) --> Returns true if pos does not emit power in any way
-- mesecon.is_powered(pos) --> Returns true if pos is powered by a receptor or a conductor
-- RULES ROTATION helpers
-- mesecon.rotate_rules_right(rules)
-- mesecon.rotate_rules_left(rules)
-- mesecon.rotate_rules_up(rules)
-- mesecon.rotate_rules_down(rules)
-- These functions return rules that have been rotated in the specific direction
-- See fifo_queue.lua for documentation.
mesecon.fifo_queue = dofile(minetest.get_modpath("mesecons").."/fifo_queue.lua")
-- General
function mesecon.get_effector(nodename)
local def = minetest.registered_nodes[nodename]
return def and def.mesecons and def.mesecons.effector
end
function mesecon.get_receptor(nodename)
local def = minetest.registered_nodes[nodename]
return def and def.mesecons and def.mesecons.receptor
end
function mesecon.get_conductor(nodename)
local def = minetest.registered_nodes[nodename]
return def and def.mesecons and def.mesecons.conductor
end
function mesecon.get_any_outputrules(node)
if not node then return nil end
if mesecon.is_conductor(node.name) then
return mesecon.conductor_get_rules(node)
elseif mesecon.is_receptor(node.name) then
return mesecon.receptor_get_rules(node)
end
end
function mesecon.get_any_inputrules(node)
if not node then return nil end
if mesecon.is_conductor(node.name) then
return mesecon.conductor_get_rules(node)
elseif mesecon.is_effector(node.name) then
return mesecon.effector_get_rules(node)
end
end
function mesecon.get_any_rules(node)
return mesecon.merge_rule_sets(mesecon.get_any_inputrules(node),
mesecon.get_any_outputrules(node))
end
-- Receptors
-- Nodes that can power mesecons
function mesecon.is_receptor_on(nodename)
local receptor = mesecon.get_receptor(nodename)
if receptor and receptor.state == mesecon.state.on then
return true
end
return false
end
function mesecon.is_receptor_off(nodename)
local receptor = mesecon.get_receptor(nodename)
if receptor and receptor.state == mesecon.state.off then
return true
end
return false
end
function mesecon.is_receptor(nodename)
local receptor = mesecon.get_receptor(nodename)
if receptor then
return true
end
return false
end
function mesecon.receptor_get_rules(node)
local receptor = mesecon.get_receptor(node.name)
if receptor then
local rules = receptor.rules
if type(rules) == 'function' then
return rules(node)
elseif rules then
return rules
end
end
return mesecon.rules.default
end
-- Effectors
-- Nodes that can be powered by mesecons
function mesecon.is_effector_on(nodename)
local effector = mesecon.get_effector(nodename)
if effector and effector.action_off then
return true
end
return false
end
function mesecon.is_effector_off(nodename)
local effector = mesecon.get_effector(nodename)
if effector and effector.action_on then
return true
end
return false
end
function mesecon.is_effector(nodename)
local effector = mesecon.get_effector(nodename)
if effector then
return true
end
return false
end
function mesecon.effector_get_rules(node)
local effector = mesecon.get_effector(node.name)
if effector then
local rules = effector.rules
if type(rules) == 'function' then
return rules(node)
elseif rules then
return rules
end
end
return mesecon.rules.default
end
-- #######################
-- # Signals (effectors) #
-- #######################
-- Activation:
mesecon.queue:add_function("activate", function (pos, rulename)
local node = mesecon.get_node_force(pos)
if not node then return end
local effector = mesecon.get_effector(node.name)
if effector and effector.action_on then
effector.action_on(pos, node, rulename)
end
end)
function mesecon.activate(pos, node, rulename, depth)
if rulename == nil then
for _,rule in ipairs(mesecon.effector_get_rules(node)) do
mesecon.activate(pos, node, rule, depth + 1)
end
return
end
mesecon.queue:add_action(pos, "activate", {rulename}, nil, rulename, 1 / depth)
end
-- Deactivation
mesecon.queue:add_function("deactivate", function (pos, rulename)
local node = mesecon.get_node_force(pos)
if not node then return end
local effector = mesecon.get_effector(node.name)
if effector and effector.action_off then
effector.action_off(pos, node, rulename)
end
end)
function mesecon.deactivate(pos, node, rulename, depth)
if rulename == nil then
for _,rule in ipairs(mesecon.effector_get_rules(node)) do
mesecon.deactivate(pos, node, rule, depth + 1)
end
return
end
mesecon.queue:add_action(pos, "deactivate", {rulename}, nil, rulename, 1 / depth)
end
-- Change
mesecon.queue:add_function("change", function (pos, rulename, changetype)
local node = mesecon.get_node_force(pos)
if not node then return end
local effector = mesecon.get_effector(node.name)
if effector and effector.action_change then
effector.action_change(pos, node, rulename, changetype)
end
end)
function mesecon.changesignal(pos, node, rulename, newstate, depth)
if rulename == nil then
for _,rule in ipairs(mesecon.effector_get_rules(node)) do
mesecon.changesignal(pos, node, rule, newstate, depth + 1)
end
return
end
-- Include "change" in overwritecheck so that it cannot be overwritten
-- by "active" / "deactivate" that will be called upon the node at the same time.
local overwritecheck = {"change", rulename}
mesecon.queue:add_action(pos, "change", {rulename, newstate}, nil, overwritecheck, 1 / depth)
end
-- Conductors
function mesecon.is_conductor_on(node, rulename)
if not node then return false end
local conductor = mesecon.get_conductor(node.name)
if conductor then
if conductor.state then
return conductor.state == mesecon.state.on
end
if conductor.states then
if not rulename then
return mesecon.getstate(node.name, conductor.states) ~= 1
end
local bit = mesecon.rule2bit(rulename, mesecon.conductor_get_rules(node))
local binstate = mesecon.getbinstate(node.name, conductor.states)
return mesecon.get_bit(binstate, bit)
end
end
return false
end
function mesecon.is_conductor_off(node, rulename)
if not node then return false end
local conductor = mesecon.get_conductor(node.name)
if conductor then
if conductor.state then
return conductor.state == mesecon.state.off
end
if conductor.states then
if not rulename then
return mesecon.getstate(node.name, conductor.states) == 1
end
local bit = mesecon.rule2bit(rulename, mesecon.conductor_get_rules(node))
local binstate = mesecon.getbinstate(node.name, conductor.states)
return not mesecon.get_bit(binstate, bit)
end
end
return false
end
function mesecon.is_conductor(nodename)
local conductor = mesecon.get_conductor(nodename)
if conductor then
return true
end
return false
end
function mesecon.get_conductor_on(node_off, rulename)
local conductor = mesecon.get_conductor(node_off.name)
if conductor then
if conductor.onstate then
return conductor.onstate
end
if conductor.states then
local bit = mesecon.rule2bit(rulename, mesecon.conductor_get_rules(node_off))
local binstate = mesecon.getbinstate(node_off.name, conductor.states)
binstate = mesecon.set_bit(binstate, bit, "1")
return conductor.states[tonumber(binstate,2)+1]
end
end
return nil
end
function mesecon.get_conductor_off(node_on, rulename)
local conductor = mesecon.get_conductor(node_on.name)
if conductor then
if conductor.offstate then
return conductor.offstate
end
if conductor.states then
local bit = mesecon.rule2bit(rulename, mesecon.conductor_get_rules(node_on))
local binstate = mesecon.getbinstate(node_on.name, conductor.states)
binstate = mesecon.set_bit(binstate, bit, "0")
return conductor.states[tonumber(binstate,2)+1]
end
end
return nil
end
function mesecon.conductor_get_rules(node)
local conductor = mesecon.get_conductor(node.name)
if conductor then
local rules = conductor.rules
if type(rules) == 'function' then
return rules(node)
elseif rules then
return rules
end
end
return mesecon.rules.default
end
-- some more general high-level stuff
function mesecon.is_power_on(pos, rulename)
local node = mesecon.get_node_force(pos)
if node and (mesecon.is_conductor_on(node, rulename) or mesecon.is_receptor_on(node.name)) then
return true
end
return false
end
function mesecon.is_power_off(pos, rulename)
local node = mesecon.get_node_force(pos)
if node and (mesecon.is_conductor_off(node, rulename) or mesecon.is_receptor_off(node.name)) then
return true
end
return false
end
-- The set of conductor states which require light updates when they change.
local light_update_conductors
-- Calculate the contents of the above set if they have not been calculated.
local function find_light_update_conductors()
-- The expensive calculation is only done the first time.
if light_update_conductors then return end
light_update_conductors = {}
-- Find conductors whose lighting characteristics change depending on their state.
local checked = {}
for name, def in pairs(minetest.registered_nodes) do
local conductor = mesecon.get_conductor(name)
if conductor and not checked[name] then
-- Find the other states of the conductor besides the current one.
local other_states
if conductor.onstate then
other_states = {conductor.onstate}
elseif conductor.offstate then
other_states = {conductor.offstate}
else
other_states = conductor.states
end
-- Check the conductor. Other states are marked as checked.
for _, other_state in ipairs(other_states) do
local other_def = minetest.registered_nodes[other_state]
if (def.paramtype == "light") ~= (other_def.paramtype == "light")
or def.sunlight_propagates ~= other_def.sunlight_propagates
or def.light_source ~= other_def.light_source then
-- The light characteristics change depending on the state.
-- The states are added to the set.
light_update_conductors[name] = true
for _, other_state in ipairs(other_states) do
light_update_conductors[other_state] = true
checked[other_state] = true
end
break
end
checked[other_state] = true
end
end
end
end
-- Turn off an equipotential section starting at `pos`, which outputs in the direction of `link`.
-- Breadth-first search. Map is abstracted away in a voxelmanip.
-- Follow all all conductor paths replacing conductors that were already
-- looked at, activating / changing all effectors along the way.
function mesecon.turnon(pos, link)
find_light_update_conductors()
local frontiers = mesecon.fifo_queue.new()
frontiers:add({pos = pos, link = link})
local pos_can_be_skipped = {}
local depth = 1
for f in frontiers:iter() do
local node = mesecon.get_node_force(f.pos)
if not node then
-- Area does not exist; do nothing
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
elseif mesecon.is_conductor(node.name) then
local rules = mesecon.conductor_get_rules(node)
if mesecon.is_conductor_off(node, f.link) then
-- Call turnon on neighbors
for _, r in ipairs(mesecon.rule2meta(f.link, rules)) do
local np = vector.add(f.pos, r)
if not pos_can_be_skipped[minetest.hash_node_position(np)] then
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
frontiers:add({pos = np, link = l})
end
end
end
mesecon.swap_node_force(f.pos, mesecon.get_conductor_on(node, f.link), light_update_conductors[node.name] ~= nil)
end
-- Only conductors with flat rules can be reliably skipped later
if not rules[1] or rules[1].x then
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
end
elseif mesecon.is_effector(node.name) then
mesecon.changesignal(f.pos, node, f.link, mesecon.state.on, depth)
if mesecon.is_effector_off(node.name) then
mesecon.activate(f.pos, node, f.link, depth)
end
else
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
end
depth = depth + 1
end
end
-- Turn on an equipotential section starting at `pos`, which outputs in the direction of `link`.
-- Breadth-first search. Map is abstracted away in a voxelmanip.
-- Follow all all conductor paths replacing conductors that were already
-- looked at, deactivating / changing all effectors along the way.
-- In case an onstate receptor is discovered, abort the process by returning false, which will
-- cause `receptor_off` to discard all changes made in the voxelmanip.
-- Contrary to turnon, turnoff has to cache all change and deactivate signals so that they will only
-- be called in the very end when we can be sure that no conductor was found along the path.
--
-- Signal table entry structure:
-- {
-- pos = position of effector,
-- node = node descriptor (name, param1 and param2),
-- link = link the effector is connected to,
-- depth = indicates order in which signals wire fired, higher is later
-- }
function mesecon.turnoff(pos, link)
find_light_update_conductors()
local frontiers = mesecon.fifo_queue.new()
frontiers:add({pos = pos, link = link})
local signals = {}
local pos_can_be_skipped = {}
local depth = 1
for f in frontiers:iter() do
local node = mesecon.get_node_force(f.pos)
if not node then
-- Area does not exist; do nothing
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
elseif mesecon.is_conductor(node.name) then
local rules = mesecon.conductor_get_rules(node)
if mesecon.is_conductor_on(node, f.link) then
for _, r in ipairs(mesecon.rule2meta(f.link, rules)) do
local np = vector.add(f.pos, r)
if not pos_can_be_skipped[minetest.hash_node_position(np)] then
-- Check if an onstate receptor is connected. If that is the case,
-- abort this turnoff process by returning false. `receptor_off` will
-- discard all the changes that we made in the voxelmanip:
if mesecon.rules_link_rule_all_inverted(f.pos, r)[1] then
if mesecon.is_receptor_on(mesecon.get_node_force(np).name) then
return false
end
end
-- Call turnoff on neighbors
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
frontiers:add({pos = np, link = l})
end
end
end
mesecon.swap_node_force(f.pos, mesecon.get_conductor_off(node, f.link), light_update_conductors[node.name] ~= nil)
end
-- Only conductors with flat rules can be reliably skipped later
if not rules[1] or rules[1].x then
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
end
elseif mesecon.is_effector(node.name) then
table.insert(signals, {
pos = f.pos,
node = node,
link = f.link,
depth = depth
})
else
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
end
depth = depth + 1
end
for _, sig in ipairs(signals) do
-- If sig.depth is 1, it has not yet been checked that the power source is actually off.
if sig.depth > 1 or not mesecon.is_powered(sig.pos, sig.link) then
mesecon.changesignal(sig.pos, sig.node, sig.link, mesecon.state.off, sig.depth)
if mesecon.is_effector_on(sig.node.name) and not mesecon.is_powered(sig.pos) then
mesecon.deactivate(sig.pos, sig.node, sig.link, sig.depth)
end
end
end
return true
end
-- Get all linking inputrules of inputnode (effector or conductor) that is connected to
-- outputnode (receptor or conductor) at position `output` and has an output in direction `rule`
function mesecon.rules_link_rule_all(output, rule)
local input = vector.add(output, rule)
local inputnode = mesecon.get_node_force(input)
local inputrules = mesecon.get_any_inputrules(inputnode)
if not inputrules then
return {}
end
local rules = {}
for _, inputrule in ipairs(mesecon.flattenrules(inputrules)) do
-- Check if input accepts from output
if vector.equals(vector.add(input, inputrule), output) then
table.insert(rules, inputrule)
end
end
return rules
end
-- Get all linking outputnodes of outputnode (receptor or conductor) that is connected to
-- inputnode (effector or conductor) at position `input` and has an input in direction `rule`
function mesecon.rules_link_rule_all_inverted(input, rule)
local output = vector.add(input, rule)
local outputnode = mesecon.get_node_force(output)
local outputrules = mesecon.get_any_outputrules(outputnode)
if not outputrules then
return {}
end
local rules = {}
for _, outputrule in ipairs(mesecon.flattenrules(outputrules)) do
if vector.equals(vector.add(output, outputrule), input) then
table.insert(rules, mesecon.invertRule(outputrule))
end
end
return rules
end
function mesecon.is_powered(pos, rule)
local node = mesecon.get_node_force(pos)
local rules = mesecon.get_any_inputrules(node)
if not rules then return false end
-- List of nodes that send out power to pos
local sourcepos = {}
if not rule then
for _, rule in ipairs(mesecon.flattenrules(rules)) do
local rulenames = mesecon.rules_link_rule_all_inverted(pos, rule)
for _, rname in ipairs(rulenames) do
local np = vector.add(pos, rname)
local nn = mesecon.get_node_force(np)
if (mesecon.is_conductor_on(nn, mesecon.invertRule(rname))
or mesecon.is_receptor_on(nn.name)) then
table.insert(sourcepos, np)
end
end
end
else
local rulenames = mesecon.rules_link_rule_all_inverted(pos, rule)
for _, rname in ipairs(rulenames) do
local np = vector.add(pos, rname)
local nn = mesecon.get_node_force(np)
if (mesecon.is_conductor_on (nn, mesecon.invertRule(rname))
or mesecon.is_receptor_on (nn.name)) then
table.insert(sourcepos, np)
end
end
end
-- Return FALSE if not powered, return list of sources if is powered
if (#sourcepos == 0) then return false
else return sourcepos end
end