Minetest-WorldEdit/worldedit/serialization.lua

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worldedit = worldedit or {}
local minetest = minetest --local copy of global
--modifies positions `pos1` and `pos2` so that each component of `pos1` is less than or equal to its corresponding conent of `pos2`, returning two new positions
worldedit.sort_pos = function(pos1, pos2)
pos1 = {x=pos1.x, y=pos1.y, z=pos1.z}
pos2 = {x=pos2.x, y=pos2.y, z=pos2.z}
if pos1.x > pos2.x then
pos2.x, pos1.x = pos1.x, pos2.x
end
if pos1.y > pos2.y then
pos2.y, pos1.y = pos1.y, pos2.y
end
if pos1.z > pos2.z then
pos2.z, pos1.z = pos1.z, pos2.z
end
return pos1, pos2
end
--determines the version of serialized data `value`, returning the version as a positive integer or 0 for unknown versions
worldedit.valueversion = function(value)
if value:find("([+-]?%d+)%s+([+-]?%d+)%s+([+-]?%d+)") and not value:find("%{") then --previous list format
return 3
elseif value:find("^[^\"']+%{%d+%}") then
if value:find("%[\"meta\"%]") then --previous meta flat table format
return 2
end
return 1 --original flat table format
elseif value:find("%{") then --current nested table format
return 4
end
return 0 --unknown format
end
--converts the region defined by positions `pos1` and `pos2` into a single string, returning the serialized data and the number of nodes serialized
worldedit.serialize = function(pos1, pos2)
--make area stay loaded
local manip = minetest.get_voxel_manip()
manip:read_from_map(pos1, pos2)
local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
local pos = {x=pos1.x, y=0, z=0}
local count = 0
local result = {}
local get_node, get_meta = minetest.get_node, minetest.get_meta
while pos.x <= pos2.x do
pos.y = pos1.y
while pos.y <= pos2.y do
pos.z = pos1.z
while pos.z <= pos2.z do
local node = get_node(pos)
if node.name ~= "air" and node.name ~= "ignore" then
count = count + 1
local meta = get_meta(pos):to_table()
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--convert metadata itemstacks to itemstrings
for name, inventory in pairs(meta.inventory) do
for index, stack in ipairs(inventory) do
inventory[index] = stack.to_string and stack:to_string() or stack
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end
end
result[count] = {
x = pos.x - pos1.x,
y = pos.y - pos1.y,
z = pos.z - pos1.z,
name = node.name,
param1 = node.param1,
param2 = node.param2,
meta = meta,
}
end
pos.z = pos.z + 1
end
pos.y = pos.y + 1
end
pos.x = pos.x + 1
end
result = minetest.serialize(result) --convert entries to a string
return result, count
end
--determines the volume the nodes represented by string `value` would occupy if deserialized at `originpos`, returning the two corner positions and the number of nodes
--contains code based on [table.save/table.load](http://lua-users.org/wiki/SaveTableToFile) by ChillCode, available under the MIT license (GPL compatible)
worldedit.allocate = function(originpos, value)
local huge = math.huge
local pos1x, pos1y, pos1z = huge, huge, huge
local pos2x, pos2y, pos2z = -huge, -huge, -huge
local originx, originy, originz = originpos.x, originpos.y, originpos.z
local count = 0
local version = worldedit.valueversion(value)
if version == 1 or version == 2 then --flat table format
--obtain the node table
local get_tables = loadstring(value)
if get_tables then --error loading value
return originpos, originpos, count
end
local tables = get_tables()
--transform the node table into an array of nodes
for i = 1, #tables do
for j, v in pairs(tables[i]) do
if type(v) == "table" then
tables[i][j] = tables[v[1]]
end
end
end
local nodes = tables[1]
--check the node array
count = #nodes
if version == 1 then --original flat table format
for index = 1, count do
local entry = nodes[index]
local pos = entry[1]
local x, y, z = originx - pos.x, originy - pos.y, originz - pos.z
if x < pos1x then pos1x = x end
if y < pos1y then pos1y = y end
if z < pos1z then pos1z = z end
if x > pos2x then pos2x = x end
if y > pos2y then pos2y = y end
if z > pos2z then pos2z = z end
end
else --previous meta flat table format
for index = 1, count do
local entry = nodes[index]
local x, y, z = originx - entry.x, originy - entry.y, originz - entry.z
if x < pos1x then pos1x = x end
if y < pos1y then pos1y = y end
if z < pos1z then pos1z = z end
if x > pos2x then pos2x = x end
if y > pos2y then pos2y = y end
if z > pos2z then pos2z = z end
end
end
elseif version == 3 then --previous list format
for x, y, z, name, param1, param2 in value:gmatch("([+-]?%d+)%s+([+-]?%d+)%s+([+-]?%d+)%s+([^%s]+)%s+(%d+)%s+(%d+)[^\r\n]*[\r\n]*") do --match node entries
x, y, z = originx + tonumber(x), originy + tonumber(y), originz + tonumber(z)
if x < pos1x then pos1x = x end
if y < pos1y then pos1y = y end
if z < pos1z then pos1z = z end
if x > pos2x then pos2x = x end
if y > pos2y then pos2y = y end
if z > pos2z then pos2z = z end
count = count + 1
end
elseif version == 4 then --current nested table format
--wip: this is a filthy hack that works surprisingly well
value = value:gsub("return%s*{", "", 1):gsub("}%s*$", "", 1)
local escaped = value:gsub("\\\\", "@@"):gsub("\\\"", "@@"):gsub("(\"[^\"]*\")", function(s) return string.rep("@", #s) end)
local startpos, startpos1, endpos = 1, 1
local nodes = {}
while true do
startpos, endpos = escaped:find("},%s*{", startpos)
if not startpos then
break
end
local current = value:sub(startpos1, startpos)
table.insert(nodes, minetest.deserialize("return " .. current))
startpos, startpos1 = endpos, endpos
end
table.insert(nodes, minetest.deserialize("return " .. value:sub(startpos1)))
--local nodes = minetest.deserialize(value) --wip: this is broken for larger tables in the current version of LuaJIT
count = #nodes
for index = 1, count do
local entry = nodes[index]
x, y, z = originx + entry.x, originy + entry.y, originz + entry.z
if x < pos1x then pos1x = x end
if y < pos1y then pos1y = y end
if z < pos1z then pos1z = z end
if x > pos2x then pos2x = x end
if y > pos2y then pos2y = y end
if z > pos2z then pos2z = z end
end
end
local pos1 = {x=pos1x, y=pos1y, z=pos1z}
local pos2 = {x=pos2x, y=pos2y, z=pos2z}
return pos1, pos2, count
end
--loads the nodes represented by string `value` at position `originpos`, returning the number of nodes deserialized
--contains code based on [table.save/table.load](http://lua-users.org/wiki/SaveTableToFile) by ChillCode, available under the MIT license (GPL compatible)
worldedit.deserialize = function(originpos, value)
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--make area stay loaded
local pos1, pos2 = worldedit.allocate(originpos, value)
local manip = minetest.get_voxel_manip()
manip:read_from_map(pos1, pos2)
local originx, originy, originz = originpos.x, originpos.y, originpos.z
local count = 0
local add_node, get_meta = minetest.add_node, minetest.get_meta
local version = worldedit.valueversion(value)
if version == 1 or version == 2 then --original flat table format
--obtain the node table
local get_tables = loadstring(value)
if not get_tables then --error loading value
return count
end
local tables = get_tables()
--transform the node table into an array of nodes
for i = 1, #tables do
for j, v in pairs(tables[i]) do
if type(v) == "table" then
tables[i][j] = tables[v[1]]
end
end
end
local nodes = tables[1]
--load the node array
count = #nodes
if version == 1 then --original flat table format
for index = 1, count do
local entry = nodes[index]
local pos = entry[1]
pos.x, pos.y, pos.z = originx - pos.x, originy - pos.y, originz - pos.z
add_node(pos, entry[2])
end
else --previous meta flat table format
for index = 1, #nodes do
local entry = nodes[index]
entry.x, entry.y, entry.z = originx + entry.x, originy + entry.y, originz + entry.z
add_node(entry, entry) --entry acts both as position and as node
get_meta(entry):from_table(entry.meta)
end
end
elseif version == 3 then --previous list format
local pos = {x=0, y=0, z=0}
local node = {name="", param1=0, param2=0}
for x, y, z, name, param1, param2 in value:gmatch("([+-]?%d+)%s+([+-]?%d+)%s+([+-]?%d+)%s+([^%s]+)%s+(%d+)%s+(%d+)[^\r\n]*[\r\n]*") do --match node entries
pos.x, pos.y, pos.z = originx + tonumber(x), originy + tonumber(y), originz + tonumber(z)
node.name, node.param1, node.param2 = name, param1, param2
add_node(pos, node)
count = count + 1
end
elseif version == 4 then --current nested table format
--wip: this is a filthy hack that works surprisingly well
value = value:gsub("return%s*{", "", 1):gsub("}%s*$", "", 1)
local escaped = value:gsub("\\\\", "@@"):gsub("\\\"", "@@"):gsub("(\"[^\"]*\")", function(s) return string.rep("@", #s) end)
local startpos, startpos1, endpos = 1, 1
local nodes = {}
while true do
startpos, endpos = escaped:find("},%s*{", startpos)
if not startpos then
break
end
local current = value:sub(startpos1, startpos)
table.insert(nodes, minetest.deserialize("return " .. current))
startpos, startpos1 = endpos, endpos
end
table.insert(nodes, minetest.deserialize("return " .. value:sub(startpos1)))
--local nodes = minetest.deserialize(value) --wip: this is broken for larger tables in the current version of LuaJIT
--load the nodes
count = #nodes
for index = 1, count do
local entry = nodes[index]
entry.x, entry.y, entry.z = originx + entry.x, originy + entry.y, originz + entry.z
add_node(entry, entry) --entry acts both as position and as node
end
--load the metadata
for index = 1, count do
local entry = nodes[index]
get_meta(entry):from_table(entry.meta)
end
end
return count
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end