123 lines
4.7 KiB
Lua
123 lines
4.7 KiB
Lua
--- Schematic serialization and deserialiation.
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-- @module worldedit.serialization
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--worldedit.LATEST_SERIALIZATION_VERSION = 5
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--local LATEST_SERIALIZATION_HEADER = worldedit.LATEST_SERIALIZATION_VERSION .. ":"
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--[[
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Serialization version history:
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1: Original format. Serialized Lua table with a weird linked format...
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2: Position and node seperated into sub-tables in fields `1` and `2`.
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3: List of nodes, one per line, with fields seperated by spaces.
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Format: <X> <Y> <Z> <Name> <Param1> <Param2>
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4: Serialized Lua table containing a list of nodes with `x`, `y`, `z`,
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`name`, `param1`, `param2`, and `meta` fields.
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5: Added header and made `param1`, `param2`, and `meta` fields optional.
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Header format: <Version>,<ExtraHeaderField1>,...:<Content>
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--]]
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--- Reads the header of serialized data.
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-- @param value Serialized WorldEdit data.
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-- @return The version as a positive natural number, or 0 for unknown versions.
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-- @return Extra header fields as a list of strings, or nil if not supported.
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-- @return Content (data after header).
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function towntest_chest.we_read_header(value)
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if value:find("^[0-9]+[%-:]") then
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local header_end = value:find(":", 1, true)
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local header = value:sub(1, header_end - 1):split(",")
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local version = tonumber(header[1])
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table.remove(header, 1)
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local content = value:sub(header_end + 1)
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return version, header, content
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end
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-- Old versions that didn't include a header with a version number
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if value:find("([+-]?%d+)%s+([+-]?%d+)%s+([+-]?%d+)") and not value:find("%{") then -- List format
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return 3, nil, value
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elseif value:find("^[^\"']+%{%d+%}") then
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if value:find("%[\"meta\"%]") then -- Meta flat table format
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return 2, nil, value
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end
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return 1, nil, value -- Flat table format
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elseif value:find("%{") then -- Raw nested table format
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return 4, nil, value
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end
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return nil
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end
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--- Loads the schematic in `value` into a node list in the latest format.
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-- Contains code based on [table.save/table.load](http://lua-users.org/wiki/SaveTableToFile)
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-- by ChillCode, available under the MIT license.
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-- @return A node list in the latest format, or nil on failure.
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function towntest_chest.we_load_schematic(value)
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local version, header, content = towntest_chest.we_read_header(value)
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local nodes = {}
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if version == 1 or version == 2 then -- Original flat table format
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local tables = minetest.deserialize(content)
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if not tables then return nil end
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-- Transform the node table into an array of nodes
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for i = 1, #tables do
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for j, v in pairs(tables[i]) do
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if type(v) == "table" then
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tables[i][j] = tables[v[1]]
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end
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end
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end
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nodes = tables[1]
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if version == 1 then --original flat table format
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for i, entry in ipairs(nodes) do
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local pos = entry[1]
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entry.x, entry.y, entry.z = pos.x, pos.y, pos.z
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entry[1] = nil
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local node = entry[2]
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entry.name, entry.param1, entry.param2 = node.name, node.param1, node.param2
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entry[2] = nil
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end
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end
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elseif version == 3 then -- List format
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for x, y, z, name, param1, param2 in content:gmatch(
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"([+-]?%d+)%s+([+-]?%d+)%s+([+-]?%d+)%s+" ..
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"([^%s]+)%s+(%d+)%s+(%d+)[^\r\n]*[\r\n]*") do
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param1, param2 = tonumber(param1), tonumber(param2)
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table.insert(nodes, {
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x = tonumber(x),
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y = tonumber(y),
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z = tonumber(z),
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name = name,
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param1 = param1 ~= 0 and param1 or nil,
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param2 = param2 ~= 0 and param2 or nil,
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})
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end
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elseif version == 4 or version == 5 then -- Nested table format
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if not jit then
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-- This is broken for larger tables in the current version of LuaJIT
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nodes = minetest.deserialize(content)
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else
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-- XXX: This is a filthy hack that works surprisingly well - in LuaJIT, `minetest.deserialize` will fail due to the register limit
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nodes = {}
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content = content:gsub("return%s*{", "", 1):gsub("}%s*$", "", 1) -- remove the starting and ending values to leave only the node data
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local escaped = content:gsub("\\\\", "@@"):gsub("\\\"", "@@"):gsub("(\"[^\"]*\")", function(s) return string.rep("@", #s) end)
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local startpos, startpos1, endpos = 1, 1
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while true do -- go through each individual node entry (except the last)
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startpos, endpos = escaped:find("},%s*{", startpos)
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if not startpos then
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break
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end
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local current = content:sub(startpos1, startpos)
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local entry = minetest.deserialize("return " .. current)
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table.insert(nodes, entry)
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startpos, startpos1 = endpos, endpos
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end
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local entry = minetest.deserialize("return " .. content:sub(startpos1)) -- process the last entry
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table.insert(nodes, entry)
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end
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else
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return nil
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end
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return nodes
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end
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