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-- train_related.lua
-- Occupation of track sections - mainly implementation of train callbacks
--[[
Track section occupation is saved as follows
In train:
train.il_sections = {
[n] = {ts_id = <...> (origin = <sigd>)}
}
-- "origin" is the TCB (signal describer) the train initially entered this section
In track section
ts.trains = {
[n] = <train_id>
}
When any inconsistency is detected, we will assume the most restrictive setup.
It will be possible to indicate a section "free" via the GUI.
]]
local ildb = advtrains.interlocking.db
local function itexist(tbl, com)
for _,item in ipairs(tbl) do
if (item==com) then
return true
end
end
return false
end
local function itkexist(tbl, ikey, com)
for _,item in ipairs(tbl) do
if item[ikey] == com then
return true
end
end
return false
end
local function itremove(tbl, com)
local i=1
while i <= #tbl do
if tbl[i] == com then
table.remove(tbl, i)
else
i = i + 1
end
end
end
local function itkremove(tbl, ikey, com)
local i=1
while i <= #tbl do
if tbl[i][ikey] == com then
table.remove(tbl, i)
else
i = i + 1
end
end
end
local function setsection(tid, train, ts_id, ts, origin)
-- train
if not train.il_sections then train.il_sections = {} end
if not itkexist(train.il_sections, "ts_id", ts_id) then
table.insert(train.il_sections, {ts_id = ts_id, origin = origin})
end
-- ts
if not ts.trains then ts.trains = {} end
if not itexist(ts.trains, tid) then
table.insert(ts.trains, tid)
end
end
local function freesection(tid, train, ts_id, ts)
-- train
if not train.il_sections then train.il_sections = {} end
itkremove(train.il_sections, "ts_id", ts_id)
-- ts
if not ts.trains then ts.trains = {} end
itremove(ts.trains, tid)
end
-- This is regular operation
-- The train is on a track and drives back and forth
-- This sets the section for both directions, to be failsafe
advtrains.tnc_register_on_enter(function(pos, id, train, index)
local tcb = ildb.get_tcb(pos)
if tcb then
for connid=1,2 do
local ts = tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
if ts then
setsection(id, train, tcb[connid].ts_id, ts, {p=pos, s=connid})
end
end
end
end)
-- this time, of course, only clear the backside (cp connid)
advtrains.tnc_register_on_leave(function(pos, id, train, index)
local tcb = ildb.get_tcb(pos)
if tcb and train.path_cp[index] then
local connid = train.path_cp[index]
local ts = tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
if ts then
freesection(id, train, tcb[connid].ts_id, ts)
end
end
end)
-- those callbacks are needed to account for created and removed trains (also regarding coupling)
advtrains.te_register_on_create(function(id, train)
-- let's see what track sections we find here
local index = atround(train.index)
local pos = advtrains.path_get(train, index)
local ts_id, origin = ildb.get_ts_at_pos(pos)
if ts_id then
local ts = ildb.get_ts(ts_id)
if ts then
setsection(id, train, ts_id, ts, origin)
else
atwarn("ILDB corruption: TCB",origin," has invalid TS reference")
end
elseif ts_id==nil then
atwarn("Train",id,": Unable to determine whether to block a track section!")
else
atdebug("Train",id,": Outside of interlocked area!")
end
end)
advtrains.te_register_on_remove(function(id, train)
if train.il_sections then
for idx, item in ipairs(train.il_sections) do
local ts = item.ts_id and ildb.get_ts(item.ts_id)
if ts and ts.trains then
itremove(ts.trains, id)
end
end
train.il_sections = nil
end
end)
|
