Implement vector and node conversion in Lua (#12609)

Co-authored-by: sfan5 <sfan5@live.de>

builtin/client/init.lua

@@ -10,3 +10,4 @@ dofile(commonpath .. "chatcommands.lua")
 dofile(clientpath .. "chatcommands.lua")
 dofile(clientpath .. "death_formspec.lua")
 dofile(clientpath .. "misc.lua")
+assert(loadfile(commonpath .. "item_s.lua"))({}) -- Just for push/read node functions

builtin/common/item_s.lua

@@ -223,3 +223,17 @@ function builtin_shared.cache_content_ids()
 		end
 	end
 end
+
+if core.set_read_node and core.set_push_node then
+	local function read_node(node)
+		return name2content[node.name], node.param1, node.param2
+	end
+	core.set_read_node(read_node)
+	core.set_read_node = nil
+
+	local function push_node(content, param1, param2)
+		return {name = content2name[content], param1 = param1, param2 = param2}
+	end
+	core.set_push_node(push_node)
+	core.set_push_node = nil
+end

builtin/common/tests/misc_helpers_spec.lua

@@ -1,5 +1,4 @@
 _G.core = {}
-_G.vector = {metatable = {}}
 dofile("builtin/common/vector.lua")
 dofile("builtin/common/misc_helpers.lua")
 

builtin/common/tests/serialize_spec.lua

@@ -1,5 +1,4 @@
 _G.core = {}
-_G.vector = {metatable = {}}
 
 _G.setfenv = require 'busted.compatibility'.setfenv
 

builtin/common/tests/vector_spec.lua

@@ -1,4 +1,4 @@
-_G.vector = {metatable = {}}
+_G.vector = {}
 dofile("builtin/common/vector.lua")
 
 describe("vector", function()

builtin/common/vector.lua

@@ -6,8 +6,10 @@ Note: The vector.*-functions must be able to accept old vectors that had no meta
 -- localize functions
 local setmetatable = setmetatable
 
--- vector.metatable is set by C++.
-local metatable = vector.metatable
+vector = {}
+
+local metatable = {}
+vector.metatable = metatable
 
 local xyz = {"x", "y", "z"}
 
@@ -366,3 +368,22 @@ function vector.dir_to_rotation(forward, up)
 	end
 	return rot
 end
+
+if rawget(_G, "core") and core.set_read_vector and core.set_push_vector then
+	local function read_vector(v)
+		return v.x, v.y, v.z
+	end
+	core.set_read_vector(read_vector)
+	core.set_read_vector = nil
+
+	if rawget(_G, "jit") then
+		-- This is necessary to prevent trace aborts.
+		local function push_vector(x, y, z)
+			return (fast_new(x, y, z))
+		end
+		core.set_push_vector(push_vector)
+	else
+		core.set_push_vector(fast_new)
+	end
+	core.set_push_vector = nil
+end

builtin/mainmenu/tests/serverlistmgr_spec.lua

@@ -1,5 +1,4 @@
 _G.core = {get_once = function(_) end}
-_G.vector = {metatable = {}}
 _G.unpack = table.unpack
 _G.serverlistmgr = {}