VoxeLibre/mods/ITEMS/REDSTONE/mesecons/internal.lua

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-- Internal.lua - The core of mesecons
--
-- For more practical developer resources see http://mesecons.net/developers.php
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--
-- 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
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-- 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)
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-- 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)
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-- 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
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-- 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)
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-- 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
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-- mesecon.is_powered(pos) --> Returns bool, spread. bool is true if pos is powered by a receptor, a conductor or an opaque block.
-- spread is true if it is powered AND also transmits its power one block further.
-- RULES ROTATION helpers
-- mesecon.rotate_rules_right(rules)
-- mesecon.rotate_rules_left(rules)
-- mesecon.rotate_rules_up(rules)
-- mesecon.rotate_rules_down(rules)
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-- These functions return rules that have been rotated in the specific direction
-- General
function mesecon.get_effector(nodename)
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if minetest.registered_nodes[nodename]
and minetest.registered_nodes[nodename].mesecons
and minetest.registered_nodes[nodename].mesecons.effector then
return minetest.registered_nodes[nodename].mesecons.effector
end
end
function mesecon.get_receptor(nodename)
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if minetest.registered_nodes[nodename]
and minetest.registered_nodes[nodename].mesecons
and minetest.registered_nodes[nodename].mesecons.receptor then
return minetest.registered_nodes[nodename].mesecons.receptor
end
end
function mesecon.get_conductor(nodename)
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if minetest.registered_nodes[nodename]
and minetest.registered_nodes[nodename].mesecons
and minetest.registered_nodes[nodename].mesecons.conductor then
return minetest.registered_nodes[nodename].mesecons.conductor
end
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)
elseif minetest.get_item_group(node.name, "opaque") == 1 then
return mesecon.rules.alldirs
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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)
elseif minetest.get_item_group(node.name, "opaque") == 1 then
return mesecon.rules.alldirs
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end
end
function mesecon.get_any_rules(node)
return mesecon.mergetable(mesecon.get_any_inputrules(node) or {},
mesecon.get_any_outputrules(node) or {})
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end
-- Receptors
-- Nodes that can power mesecons
function mesecon.is_receptor_on(nodename)
local receptor = mesecon.get_receptor(nodename)
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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)
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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)
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if receptor then
return true
end
return false
end
function mesecon.receptor_get_rules(node)
local receptor = mesecon.get_receptor(node.name)
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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)
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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)
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if effector and effector.action_on then
return true
end
return false
end
function mesecon.is_effector(nodename)
local effector = mesecon.get_effector(nodename)
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if effector then
return true
end
return false
end
function mesecon.effector_get_rules(node)
local effector = mesecon.get_effector(node.name)
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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)
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if effector and effector.action_on then
effector.action_on(pos, node, rulename)
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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)
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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)
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if effector and effector.action_off then
effector.action_off(pos, node, rulename)
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end
end)
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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
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end
mesecon.queue:add_action(pos, "deactivate", {rulename}, nil, rulename, 1 / depth)
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end
-- Change
mesecon.queue:add_function("change", function (pos, rulename, changetype)
local node = mesecon.get_node_force(pos)
if not node then return end
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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)
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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
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end
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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
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end
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return false
end
function mesecon.is_conductor(nodename)
local conductor = mesecon.get_conductor(nodename)
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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)
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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
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end
return offstate
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end
function mesecon.get_conductor_off(node_on, rulename)
local conductor = mesecon.get_conductor(node_on.name)
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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
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end
return onstate
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end
function mesecon.conductor_get_rules(node)
local conductor = mesecon.get_conductor(node.name)
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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
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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
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return true
end
return false
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)
local frontiers = {{pos = pos, link = link}}
local depth = 1
while frontiers[1] do
local f = table.remove(frontiers, 1)
local node = mesecon.get_node_force(f.pos)
if not node then
-- Area does not exist; do nothing
elseif mesecon.is_conductor_off(node, f.link) then
local rules = mesecon.conductor_get_rules(node)
-- Call turnon on neighbors
for _, r in ipairs(mesecon.rule2meta(f.link, rules)) do
local np = vector.add(f.pos, r)
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
table.insert(frontiers, {pos = np, link = l})
end
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end
mesecon.swap_node_force(f.pos, mesecon.get_conductor_on(node, f.link))
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)
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end
end
if node and f.link.spread and minetest.get_item_group(node.name, "opaque") == 1 then
-- Call turnon on neighbors
-- Warning: A LOT of nodes need to be looked at for this to work
for _, r in ipairs(mesecon.rule2meta(f.link, mesecon.rules.mcl_alldirs_spread)) do
local np = vector.add(f.pos, r)
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
local nlink = table.copy(l)
nlink.spread = false
table.insert(frontiers, {pos = np, link = nlink})
end
end
end
depth = depth + 1
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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, 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)
local frontiers = {{pos = pos, link = link}}
local signals = {}
local depth = 1
while frontiers[1] do
local f = table.remove(frontiers, 1)
local node = mesecon.get_node_force(f.pos)
if not node then
-- No-op
elseif mesecon.is_conductor_on(node, f.link) then
local rules = mesecon.conductor_get_rules(node)
for _, r in ipairs(mesecon.rule2meta(f.link, rules)) do
local np = vector.add(f.pos, r)
-- 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:
for _, l in ipairs(mesecon.rules_link_rule_all_inverted(f.pos, r)) do
if mesecon.is_receptor_on(mesecon.get_node_force(np).name) then
return false
end
end
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-- Call turnoff on neighbors
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
table.insert(frontiers, {pos = np, link = l})
end
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end
mesecon.swap_node_force(f.pos, mesecon.get_conductor_off(node, f.link))
elseif mesecon.is_effector(node.name) then
table.insert(signals, {
pos = f.pos,
node = node,
link = f.link,
depth = depth
})
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end
if node and f.link.spread and minetest.get_item_group(node.name, "opaque") == 1 then
-- Call turnoff on neighbors
-- Warning: A LOT of nodes need to be looked at for this to work
for _, r in ipairs(mesecon.rule2meta(f.link, mesecon.rules.mcl_alldirs_spread)) do
local np = vector.add(f.pos, r)
if mesecon.is_receptor_on(mesecon.get_node_force(np).name) then
return false
end
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
local nlink = table.copy(l)
nlink.spread = false
table.insert(frontiers, {pos = np, link = nlink})
end
end
end
depth = depth + 1
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end
for _, sig in ipairs(signals) do
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)
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end
end
return true
end
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-- 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 {}
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end
local rules = {}
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for _, inputrule in ipairs(mesecon.flattenrules(inputrules)) do
-- Check if input accepts from output
if vector.equals(vector.add(input, inputrule), output) then
local newrule = table.copy(inputrule)
newrule.spread = rule.spread
table.insert(rules, newrule)
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end
end
return rules
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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 {}
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end
local rules = {}
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for _, outputrule in ipairs(mesecon.flattenrules(outputrules)) do
if vector.equals(vector.add(output, outputrule), input) then
local newrule = table.copy(outputrule)
newrule = mesecon.invertRule(newrule)
newrule.spread = rule.spread
table.insert(rules, newrule)
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end
end
return rules
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end
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function mesecon.is_powered(pos, rule, depth, sourcepos, home_pos)
if depth == nil then depth = 0 end
if depth > 1 then
return false, false
end
local node = mesecon.get_node_force(pos)
local rules = mesecon.get_any_inputrules(node)
if not rules then
return false, false
end
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if not home_pos then
home_pos = pos
end
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-- List of nodes that send out power to pos
if sourcepos == nil then
sourcepos = {}
end
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local function power_walk(pos, home_pos, sourcepos, rulenames, rule, depth)
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local spread = false
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
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if not vector.equals(home_pos, np) then
local rulez = mesecon.get_any_outputrules(nn)
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local spread_tmp = false
for r=1, #rulez do
if vector.equals(mesecon.invertRule(rname), rulez[r]) then
if rulez[r].spread then
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spread_tmp = true
end
end
end
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if depth == 0 or spread_tmp then
table.insert(sourcepos, np)
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if spread_tmp then
spread = true
end
end
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end
elseif depth == 0 and minetest.get_item_group(nn.name, "opaque") == 1 then
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local more_sourcepos = mesecon.is_powered(np, nil, depth + 1, sourcepos, home_pos)
if more_sourcepos and #more_sourcepos > 0 then
mesecon.mergetable(sourcepos, more_sourcepos)
end
end
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end
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return sourcepos, spread
end
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local spread = false
if not rule then
for _, rule in ipairs(mesecon.flattenrules(rules)) do
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local spread_temp
local rulenames = mesecon.rules_link_rule_all_inverted(pos, rule)
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sourcepos, spread_temp = power_walk(pos, home_pos, sourcepos, rulenames, rule, depth)
if spread_temp then
spread = true
end
end
else
local rulenames = mesecon.rules_link_rule_all_inverted(pos, rule)
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sourcepos, spread = power_walk(pos, home_pos, sourcepos, rulenames, rule, depth)
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end
-- Return FALSE if not powered, return list of sources if is powered
if (#sourcepos == 0) then
return false, false
else
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return sourcepos, spread
end
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end