diff options
Diffstat (limited to 'advtrains_interlocking/smartroute.lua')
| -rw-r--r-- | advtrains_interlocking/smartroute.lua | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/advtrains_interlocking/smartroute.lua b/advtrains_interlocking/smartroute.lua new file mode 100644 index 0000000..770c379 --- /dev/null +++ b/advtrains_interlocking/smartroute.lua @@ -0,0 +1,149 @@ +-- smartroute.lua +-- Implementation of the advtrains auto-route search + +local atil = advtrains.interlocking +local ildb = atil.db +local sr = {} + + +local function otherside(s) + if s==1 then return 2 else return 1 end +end + +--route search implementation +-- Note this is similar to recursively_find_routes in database.lua, there used for the rscache + +local function recursively_find_routes(s_pos, s_connid, searching_shunt, tcbseq, mark_pos, result_table, scan_limit) + --atdebug("Recursively restarting at ",s_pos, s_connid, "limit left", scan_limit) + local ti = advtrains.get_track_iterator(s_pos, s_connid, scan_limit, false) + local pos, connid, bconnid = ti:next_branch() + pos, connid, bconnid = ti:next_track()-- step once to get ahead of previous turnout + local last_pos + repeat + -- record position in mark_pos + local pts = advtrains.encode_pos(pos) + mark_pos[pts] = true + + local node = advtrains.ndb.get_node_or_nil(pos) + atdebug("(SmartRoute) Walk ",pos, "nodename", node.name, "entering at conn",bconnid) + local ndef = minetest.registered_nodes[node.name] + if ndef.advtrains and ndef.advtrains.node_state_map then + -- Stop, this is a switchable node. Find out which conns we can go at + atdebug("(SmartRoute) Found turnout ",pos, "nodename", node.name, "entering at conn",bconnid) + local out_conns = ildb.get_possible_out_connids(node.name, bconnid) + for oconnid, state in pairs(out_conns) do + --atdebug("Going in direction",oconnid,"state",state) + recursively_find_routes(pos, oconnid, searching_shunt, table.copy(tcbseq), table.copy(mark_pos), result_table, ti.limit) + end + return + end + --otherwise, this might be a tcb + local tcb = ildb.get_tcb(pos) + if tcb then + local fsigd = { p = pos, s = connid } + atdebug("(SmartRoute) Encounter TCB ",fsigd) + tcbseq[#tcbseq+1] = fsigd + -- check if this is a possible route endpoint + local tcbs = tcb[connid] + if tcbs.signal then + local ndef = advtrains.ndb.get_ndef(tcbs.signal) + if ndef and ndef.advtrains then + if ndef.advtrains.route_role == "main" or ndef.advtrains.route_role == "main_distant" + or ndef.advtrains.route_role == "end" or ndef.advtrains.route_role == "shunt" then + -- signal is suitable target + local is_mainsignal = ndef.advtrains.route_role ~= "shunt" + -- record the found route in the results + result_table[#result_table+1] = { + tcbseq = table.copy(tcbseq), + mark_pos = table.copy(mark_pos), + shunt_route = not is_mainsignal, + to_end_of_track = false, + name = tcbs.signal_name or atil.sigd_to_string(fsigd) + } + -- if this is a main signal and/or we are only searching shunt routes, stop the search here + if is_mainsignal or searching_shunt then + atdebug("(SmartRoute) Terminating here because it is main or only shunt routes searched") + return + end + end + end + end + end + -- Go forward + last_pos = pos + pos, connid, bconnid = ti:next_track() + until not pos -- this stops the loop when either the track end is reached or the limit is hit + --atdebug("recursively_find_routes: Reached track end or limit at", last_pos, ". This path is not saved, returning") +end + +local function build_route_from_foundroute(froute, name) + local route = { + name = froute.name, + use_rscache = true, + smartroute_generated = true, + } + for _, sigd in ipairs(froute.tcbseq) do + route[#route+1] = { next = sigd, locks = {} } + end + return route +end + +-- Maximum scan length for track iterator +local TS_MAX_SCAN = 1000 + +function sr.init(pname, sigd) + -- is start signal a shunt signal? + local is_startsignal_shunt = false + local tcbs = ildb.get_tcbs(sigd) + if tcbs.signal then + local ndef = advtrains.ndb.get_ndef(tcbs.signal) + if ndef and ndef.advtrains then + if ndef.advtrains.route_role == "shunt" then + is_startsignal_shunt = true + end + end + end + local result_table = {} + recursively_find_routes(sigd.p, sigd.s, is_startsignal_shunt, {}, {}, result_table, TS_MAX_SCAN) + + atdebug("Smartroute search finished:",result_table) + + -- Short-circuit logic right now for testing + -- go through and delete all routes that are autogenerated + local i = 1 + while i<=#tcbs.routes do + if tcbs.routes[i].smartroute_generated then + table.remove(tcbs.routes, i) + else + i=i+1 + end + end + -- just plainly create routes! + for idx, froute in ipairs(result_table) do + tcbs.routes[#tcbs.routes+1] = build_route_from_foundroute(froute) + end + atwarn("Smartroute done!") +end + + + +--[[ + player1 = { + origin = <sigd> + found_routes = { + { tcbseq = {<sigd1>, <sigd2>, <end_sigd>}, mark_pos = { table with keys being encoded_pos of rails constituting route }, to_end_of_track = false, shunt_route = false } + } + } +]]-- +local player_smartroute = {} + +minetest.register_on_punchnode(function(pos, node, player, pointed_thing) + local pname = player:get_player_name() + if not minetest.check_player_privs(pname, "interlocking") then + return + end + -- TODO +end) + + +advtrains.interlocking.smartroute = sr |