99 lines
2.4 KiB
Lua
99 lines
2.4 KiB
Lua
--[[
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TechAge
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=======
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Copyright (C) 2020 Joachim Stolberg
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GPL v3
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See LICENSE.txt for more information
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Storage backend for node number mapping via mod storage
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]]--
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local backend = {}
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local storage = techage.storage
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-- legacy method
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local function deserialize(s)
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local tbl = {}
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for line in s:gmatch("[^;]+") do
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local num, spos = unpack(string.split(line, "="))
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tbl[num] = minetest.string_to_pos(spos)
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end
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return tbl
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end
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local Version = minetest.deserialize(storage:get_string("Version")) or 3
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local NextNumber = 0
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if Version == 1 then
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Version = 3
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local tbl = minetest.deserialize(storage:get_string("Number2Pos")) or {}
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NextNumber = minetest.deserialize(storage:get_string("NextNumber")) or 1
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for num, pos in pairs(tbl) do
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storage:set_string(num, minetest.pos_to_string(pos))
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end
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storage:set_string("Number2Pos", "")
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elseif Version == 2 then
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Version = 3
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NextNumber = minetest.deserialize(storage:get_string("NextNumber")) or 1
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local tbl = deserialize(storage:get_string("Number2Pos"))
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for num, pos in pairs(tbl) do
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storage:set_string(num, minetest.pos_to_string(pos))
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end
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storage:set_string("Number2Pos", "")
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else
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Version = 3
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NextNumber = storage:get_int("NextNumber")
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end
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storage:set_int("NextNumber", NextNumber)
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storage:set_int("Version", Version)
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-------------------------------------------------------------------
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-- API functions
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-------------------------------------------------------------------
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function backend.get_nodepos(number)
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return minetest.string_to_pos(storage:get_string(number))
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end
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function backend.set_nodepos(number, pos)
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storage:set_string(number, minetest.pos_to_string(pos))
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end
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function backend.add_nodepos(pos)
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local num = tostring(NextNumber)
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NextNumber = NextNumber + 1
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storage:set_int("NextNumber", NextNumber)
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storage:set_string(num, minetest.pos_to_string(pos))
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return num
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end
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function backend.del_nodepos(number)
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storage:set_string(number, "")
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end
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-- delete invalid entries
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function backend.delete_invalid_entries(node_def)
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minetest.log("info", "[TechAge] Data maintenance started")
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for i = 1, NextNumber do
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local number = tostring(i)
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if storage:contains(number) then
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local pos = backend.get_nodepos(number)
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local name = techage.get_node_lvm(pos).name
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if not node_def[name] then
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backend.del_nodepos(number)
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else
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minetest.get_meta(pos):set_string("node_number", number)
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end
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end
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end
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minetest.log("info", "[TechAge] Data maintenance finished")
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end
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return backend
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