fix

This reverts commit 68f7bcc728.

worldedit/serialization.lua

@@ -1,9 +1,7 @@
 --- Schematic serialization and deserialiation.
 -- @module worldedit.serialization
 
-worldedit.LATEST_SERIALIZATION_VERSION = 5
-local LATEST_SERIALIZATION_HEADER = worldedit.LATEST_SERIALIZATION_VERSION .. ":"
-
+worldedit.LATEST_SERIALIZATION_VERSION = 6
 
 --[[
 Serialization version history:
@@ -15,6 +13,7 @@ Serialization version history:
       `name`, `param1`, `param2`, and `meta` fields.
   5: Added header and made `param1`, `param2`, and `meta` fields optional.
       Header format: <Version>,<ExtraHeaderField1>,...:<Content>
+  6: Much more complicated but also better format
 --]]
 
 
@@ -66,17 +65,105 @@ function worldedit.serialize(pos1, pos2)
 		has_meta[hash_node_position(meta_positions[i])] = true
 	end
 
-	local pos = {x=pos1.x, y=0, z=0}
+	-- Decide axis of saved rows
+	local dim = vector.add(vector.subtract(pos2, pos1), 1)
+	local axis
+	if dim.x * dim.y < math.min(dim.y * dim.z, dim.x * dim.z) then
+		axis = "z"
+	elseif dim.x * dim.z < math.min(dim.x * dim.y, dim.y * dim.z) then
+		axis = "y"
+	elseif dim.y * dim.z < math.min(dim.x * dim.y, dim.x * dim.z) then
+		axis = "x"
+	else
+		axis = "x" -- X or Z are usually most efficient
+	end
+	local other1, other2 = worldedit.get_axis_others(axis)
+
+	-- Helper functions (1)
+	local MATCH_DIST = 8
+	local function match_init(array, first_value)
+		array[1] = first_value
+		return {first_value}
+	end
+	local function match_try(cache, prev_pushed, value)
+		local i = #cache
+		while i >= 1 do
+			if cache[i] == value then
+				local ret = -(#cache - i + 1)
+				local was_value = type(prev_pushed) ~= "number" or prev_pushed >= 0
+				return ret, (was_value and ret == -1) or prev_pushed == ret
+			end
+			i = i - 1
+		end
+		return nil, false
+	end
+	local function match_push(cache, match, value)
+		if match ~= nil then -- don't advance cache
+			return match
+		end
+		local idx = #cache + 1
+		cache[idx] = value
+		if idx > MATCH_DIST then
+			table.remove(cache, 1)
+		end
+		return value
+	end
+	-- Helper functions (2)
+	local function cur_new(pos, pos1)
+		return {
+			a = axis,
+			p = {pos.x - pos1.x, pos.y - pos1.y, pos.z - pos1.z},
+			c = 1,
+			data = {},
+			param1 = {},
+			param2 = {},
+			meta = {},
+		}
+	end
+	local function is_emptyish(t)
+		-- returns true if <t> contains only one element and that one element is == 0
+		local seen = false
+		for _, value in pairs(t) do
+			if not seen then
+				if value ~= 0 then
+					return false
+				end
+				seen = true
+			else
+				return false
+			end
+		end
+		return true
+	end
+	local function cur_finish(result, cur)
+		if is_emptyish(cur.param1) then
+			cur.param1 = nil
+		end
+		if is_emptyish(cur.param2) then
+			cur.param2 = nil
+		end
+		if next(cur.meta) == nil then
+			cur.meta = nil
+		end
+		result[#result + 1] = cur
+	end
+
+	-- Serialize stuff
+	local pos = {}
 	local count = 0
 	local result = {}
-	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 cur
+	local cache_data, cache_param1, cache_param2
+	local prev_data, prev_param1, prev_param2
+	pos[other1] = pos1[other1]
+	while pos[other1] <= pos2[other1] do
+		pos[other2] = pos1[other2]
+		while pos[other2] <= pos2[other2] do
+			pos[axis] = pos1[axis]
+			while pos[axis] <= pos2[axis] do
+
 				local node = get_node(pos)
 				if node.name ~= "air" and node.name ~= "ignore" then
-					count = count + 1
 
 					local meta
 					if has_meta[hash_node_position(pos)] then
@@ -93,25 +180,68 @@ function worldedit.serialize(pos1, pos2)
 						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 ~= 0 and node.param1 or nil,
-						param2 = node.param2 ~= 0 and node.param2 or nil,
-						meta = meta,
-					}
+					if cur == nil then -- Start a new row
+						cur = cur_new(pos, pos1, axis, other1, other2)
+
+						cache_data = match_init(cur.data, node.name)
+						cache_param1 = match_init(cur.param1, node.param1)
+						cache_param2 = match_init(cur.param2, node.param2)
+						prev_data = cur.data[1]
+						prev_param1 = cur.param1[1]
+						prev_param2 = cur.param2[1]
+
+						cur.meta[1] = meta
+					else -- Append to existing row
+						local next_c = cur.c + 1
+						cur.c = next_c
+						local value, m, can_omit
+
+						value = node.name
+						m, can_omit = match_try(cache_data, prev_data, node.name)
+						if not can_omit then
+							 prev_data = match_push(cache_data, m, value)
+							 cur.data[next_c] = prev_data
 						end
-				pos.z = pos.z + 1
+
+						value = node.param1
+						m, can_omit = match_try(cache_param1, prev_param1, value)
+						if not can_omit then
+							prev_param1 = match_push(cache_param1, m, value)
+							cur.param1[next_c] = prev_param1
 						end
-			pos.y = pos.y + 1
+
+						value = node.param2
+						m, can_omit = match_try(cache_param2, prev_param2, value)
+						if not can_omit then
+							prev_param2 = match_push(cache_param2, m, value)
+							cur.param2[next_c] = prev_param2
 						end
-		pos.x = pos.x + 1
+
+						cur.meta[next_c] = meta
 					end
+					count = count + 1
+				else
+					if cur ~= nil then -- Finish row
+						cur_finish(result, cur)
+						cur = nil
+					end
+				end
+				pos[axis] = pos[axis] + 1
+
+			end
+			if cur ~= nil then -- Finish leftover row
+				cur_finish(result, cur)
+				cur = nil
+			end
+			pos[other2] = pos[other2] + 1
+		end
+		pos[other1] = pos[other1] + 1
+	end
+
 	-- Serialize entries
 	result = minetest.serialize(result)
-	return LATEST_SERIALIZATION_HEADER .. result, count
+	return tonumber(worldedit.LATEST_SERIALIZATION_VERSION) .. "," ..
+		string.format("%d,%d,%d:", dim.x, dim.y, dim.z) .. result, count
 end
 
 -- Contains code based on [table.save/table.load](http://lua-users.org/wiki/SaveTableToFile)
@@ -147,8 +277,7 @@ end
 
 --- Loads the schematic in `value` into a node list in the latest format.
 -- @return A node list in the latest format, or nil on failure.
-local function load_schematic(value)
-	local version, header, content = worldedit.read_header(value)
+local function legacy_load_schematic(version, header, content)
 	local nodes = {}
 	if version == 1 or version == 2 then -- Original flat table format
 		local tables = minetest.deserialize(content, true)
@@ -190,6 +319,8 @@ local function load_schematic(value)
 		end
 	elseif version == 4 or version == 5 then -- Nested table format
 		nodes = deserialize_workaround(content)
+	elseif version >= 6 then
+		error("legacy_load_schematic called for non-legacy schematic")
 	else
 		return nil
 	end
@@ -202,14 +333,29 @@ end
 -- @return High corner position.
 -- @return The number of nodes.
 function worldedit.allocate(origin_pos, value)
-	local nodes = load_schematic(value)
+	local version, header, content = worldedit.read_header(value)
+	if version == 6 then
+		local content = deserialize_workaround(content)
+		local pos2 = {
+			x = origin_pos.x + tonumber(header[1]) - 1,
+			y = origin_pos.y + tonumber(header[2]) - 1,
+			z = origin_pos.z + tonumber(header[3]) - 1,
+		}
+		local count = 0
+		for _, row in ipairs(content) do
+			count = count + row.c
+		end
+		return origin_pos, pos2, count
+	else
+		local nodes = legacy_load_schematic(version, header, content)
 		if not nodes or #nodes == 0 then return nil end
-	return worldedit.allocate_with_nodes(origin_pos, nodes)
+		return worldedit.legacy_allocate_with_nodes(origin_pos, nodes)
+	end
 end
 
 
 -- Internal
-function worldedit.allocate_with_nodes(origin_pos, nodes)
+function worldedit.legacy_allocate_with_nodes(origin_pos, nodes)
 	local huge = math.huge
 	local pos1x, pos1y, pos1z = huge, huge, huge
 	local pos2x, pos2y, pos2z = -huge, -huge, -huge
@@ -232,11 +378,22 @@ end
 --- Loads the nodes represented by string `value` at position `origin_pos`.
 -- @return The number of nodes deserialized.
 function worldedit.deserialize(origin_pos, value)
-	local nodes = load_schematic(value)
-	if not nodes then return nil end
-	if #nodes == 0 then return #nodes end
+	local version, header, content = worldedit.read_header(value)
+	if version == 6 then
+		local content = deserialize_workaround(content)
+		local pos2 = {
+			x = origin_pos.x + tonumber(header[1]) - 1,
+			y = origin_pos.y + tonumber(header[2]) - 1,
+			z = origin_pos.z + tonumber(header[3]) - 1,
+		}
+		worldedit.keep_loaded(origin_pos, pos2)
 
-	local pos1, pos2 = worldedit.allocate_with_nodes(origin_pos, nodes)
+		return worldedit.deserialize_with_content(origin_pos, content)
+	else
+		local nodes = legacy_load_schematic(version, header, content)
+		if not nodes or #nodes == 0 then return nil end
+
+		local pos1, pos2 = worldedit.legacy_allocate_with_nodes(origin_pos, nodes)
 		worldedit.keep_loaded(pos1, pos2)
 
 		local origin_x, origin_y, origin_z = origin_pos.x, origin_pos.y, origin_pos.z
@@ -251,5 +408,80 @@ function worldedit.deserialize(origin_pos, value)
 			end
 		end
 		return #nodes
+	end
 end
 
+-- Internal
+function worldedit.deserialize_with_content(origin_pos, content)
+	-- Helper functions
+	local function resolve_refs(array)
+		-- find (and cache) highest index
+		local max_i = 1
+		for i, _ in pairs(array) do
+			if i > max_i then max_i = i end
+		end
+		array.max_i = max_i
+		-- resolve references
+		local cache = {}
+		for i = 1, max_i do
+			local v = array[i]
+			if v ~= nil then
+				if type(v) == "number" and v < 0 then -- is a reference
+					array[i] = cache[#cache + v + 1]
+				else
+					cache[#cache + 1] = v
+				end
+			end
+		end
+	end
+	local function read_in_array(array, idx)
+		if idx > array.max_i then
+			return array[array.max_i]
+		end
+		-- go backwards until we find something
+		repeat
+			local v = array[idx]
+			if v ~= nil then
+				return v
+			end
+			idx = idx - 1
+		until idx == 0
+		assert(false)
+	end
+
+	-- Actually deserialize
+	local count = 0
+	local entry = {}
+	local add_node, get_meta = minetest.add_node, minetest.get_meta
+	for _, row in ipairs(content) do
+		local axis = row.a
+		local pos = {
+			x = origin_pos.x + row.p[1],
+			y = origin_pos.y + row.p[2],
+			z = origin_pos.z + row.p[3],
+		}
+		if row.param1 == nil then row.param1 = {0} end
+		if row.param2 == nil then row.param2 = {0} end
+		if row.meta == nil then row.meta = {} end
+		resolve_refs(row.data)
+		resolve_refs(row.param1)
+		resolve_refs(row.param2)
+
+		for i = 1, row.c do
+			entry.name = read_in_array(row.data, i)
+			entry.param1 = read_in_array(row.param1, i)
+			entry.param2 = read_in_array(row.param2, i)
+			add_node(pos, entry)
+
+			local meta = row.meta[i]
+			if meta then
+				get_meta(pos):from_table(meta)
+			end
+
+			pos[axis] = pos[axis] + 1
+		end
+
+		count = count + row.c
+	end
+	return count
+end

worldedit_commands/init.lua

@@ -1343,23 +1343,6 @@ worldedit.register_command("restore", {
 	end,
 })
 
-local function detect_misaligned_schematic(name, pos1, pos2)
-	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
-	-- Check that allocate/save can position the schematic correctly
-	-- The expected behaviour is that the (0,0,0) corner of the schematic stays
-	-- sat pos1, this only works when the minimum position is actually present
-	-- in the schematic.
-	local node = minetest.get_node(pos1)
-	local have_node_at_origin = node.name ~= "air" and node.name ~= "ignore"
-	if not have_node_at_origin then
-		worldedit.player_notify(name,
-			"Warning: The schematic contains excessive free space and WILL be "..
-			"misaligned when allocated or loaded. To avoid this, shrink your "..
-			"area to cover exactly the nodes to be saved."
-		)
-	end
-end
-
 worldedit.register_command("save", {
 	params = "<file>",
 	description = "Save the current WorldEdit region to \"(world folder)/schems/<file>.we\"",
@@ -1378,7 +1361,6 @@ worldedit.register_command("save", {
 	func = function(name, param)
 		local result, count = worldedit.serialize(worldedit.pos1[name],
 				worldedit.pos2[name])
-		detect_misaligned_schematic(name, worldedit.pos1[name], worldedit.pos2[name])
 
 		local path = minetest.get_worldpath() .. "/schems"
 		-- Create directory if it does not already exist