3 files changed, 577 insertions, 0 deletions
diff --git a/fromlua/generate.lua b/fromlua/generate.lua
new file mode 100755
index 0000000..75899b7
--- /dev/null
+++ b/fromlua/generate.lua
@@ -0,0 +1,198 @@
+#!/usr/bin/env lua
+dofile("../parse_spec.lua")
+
+local readers = {
+	SliceByte = true,
+	Byte = true,
+	String = true,
+	SliceField = true,
+	Field = true,
+	Bool = true,
+	PointedThing = true,
+}
+
+local static_uses = {
+	"[3]int16",
+	"AOID"
+}
+
+local function generate(name)
+	local fnname, index, child, childfn, childtype
+	local type = name
+
+	local open = name:find("%[")
+	local clos = name:find("%]")
+
+	if open == 1 then
+		index = name:sub(open + 1, clos - 1)
+		child = name:sub(clos + 1)
+		childfn, childtype = generate(child)
+		fnname = (index == "" and "Slice" or "Vec" .. index) .. childfn
+
+		type = "[" .. index .. "]" .. childtype
+	else
+		fnname = camel_case(name)
+
+		local c = name:sub(1, 1)
+		if c == c:upper() then
+			 type = "mt." .. name
+		end
+	end
+
+	if not readers[fnname] then
+		local fun = "func read" .. fnname .. "(l *lua.LState, val lua.LValue, ptr *" .. type  .. ") {\n"
+
+		if child then
+			fun = fun .. "\tif val.Type() != lua.LTTable {\n\t\tpanic(\"invalid value for "
+				.. name .. ": must be a table\")\n\t}\n"
+
+			if index == "" then
+				fun = fun ..
+[[
+	tbl := val.(*lua.LTable)
+	n := tbl.MaxN()
+	*ptr = make(]] .. type .. [[, n)
+	for i := range *ptr {
+		read]] .. childfn .. [[(l, l.RawGetInt(tbl, i+1), &(*ptr)[i])
+	}
+]]
+			else
+				local n = tonumber(index)
+				for i, v in ipairs({"x", "y", "z"}) do
+					if i > n then
+						break
+					end
+
+					fun = fun
+						.. "\tread" .. childfn
+						.. "(l, l.GetField(val, \"" .. v .. "\"), &(*ptr)[" .. (i - 1) .. "])\n"
+				end
+			end
+		else
+			fun = fun .. "\tif val.Type() != lua.LTNumber {\n\t\tpanic(\"invalid value for "
+				.. name .. ": must be a number\")\n\t}\n"
+				.. "\t*ptr = " .. type .. "(val.(lua.LNumber))\n"
+		end
+
+		fun = fun .. "}\n\n"
+
+		readers[fnname] = fun
+	end
+
+	return fnname, type
+end
+
+for _, use in ipairs(static_uses) do
+	generate(use)
+end
+
+local function signature(name, prefix, type)
+	local camel = camel_case(name)
+	return "func read" .. camel .. "(l *lua.LState, val lua.LValue, ptr *" .. prefix .. camel  .. ") {\n"
+end
+
+for name, fields in spairs(parse_spec("server/enum")) do
+	local camel = camel_case(name)
+	local fun = signature(name, "mt.")
+
+	local impl = ""
+	for _, var in ipairs(fields) do
+		local equals = "*ptr = mt." .. apply_prefix(fields, var) .. "\n"
+
+		if var == "no" then
+			fun = fun .. "\tif val.Type() == lua.LTNil {\n\t\t" .. equals .. "\t\treturn\n\t}\n"
+		else
+			impl = impl .. "\tcase \"" .. var .. "\":\n\t\t" .. equals
+		end
+	end
+
+	fun = fun
+		.. "\tif val.Type() != lua.LTString {\n\t\tpanic(\"invalid value for "
+		.. camel .. ": must be a string\")\n\t}\n"
+		.. "\tstr := string(val.(lua.LString))\n"
+		.. "\tswitch str {\n" .. impl
+		.. "\tdefault:\n\t\tpanic(\"invalid value for " .. name .. ": \" + str)\n\t}\n}\n\n"
+
+	readers[camel] = fun
+end
+
+for name, fields in spairs(parse_spec("server/flag")) do
+	local camel = camel_case(name)
+	local fun = signature(name, "mt.")
+		.. "\tif val.Type() != lua.LTTable {\n\t\tpanic(\"invalid value for "
+		.. camel .. ": must be a table\")\n\t}\n"
+
+	for _, var in ipairs(fields) do
+		fun = fun .. "\tif l.GetField(val, \"" .. var .. "\") == lua.LTrue {\n"
+			.. "\t\t*ptr = *ptr | mt." .. apply_prefix(fields, var) .. "\n\t}\n"
+	end
+
+	fun = fun .. "}\n\n"
+	readers[camel] = fun
+end
+
+local function fields_fromlua(fields, indent)
+	local impl = ""
+
+	for name, type in spairs(fields) do
+		impl = impl .. indent .. "read" .. generate(type) .. "(l, l.GetField(val, \"" .. name .. "\"), &ptr."
+			.. camel_case(name) .. ")\n"
+	end
+
+	return impl
+end
+
+for name, fields in spairs(parse_spec("server/struct", true)) do
+	local camel = camel_case(name)
+	readers[camel] = signature(name, "mt.")
+		.. "\tif val.Type() != lua.LTTable {\n"
+		.. "\t\tpanic(\"invalid value for " .. camel .. ": must be a table\")\n\t}\n"
+		.. fields_fromlua(fields, "\t")
+		.. "}\n\n"
+end
+
+local pkt_impl = ""
+
+for name, fields in spairs(parse_spec("server/pkt", true)) do
+	pkt_impl = pkt_impl
+		.. "\tcase \"" .. name .. "\"" .. "" .. ":\n"
+	 	.. "\t\tptr := &mt.ToSrv" .. camel_case(name) .. "{}\n"
+
+	if next(fields) then
+		pkt_impl = pkt_impl
+			.. "\t\tval := l.CheckTable(3)\n"
+			.. fields_fromlua(fields, "\t\t")
+	end
+
+	pkt_impl = pkt_impl
+		.. "\t\treturn ptr\n"
+end
+
+local funcs = ""
+for _, fn in spairs(readers) do
+	if type(fn) == "string" then
+		funcs = funcs .. fn
+	end
+end
+
+local f = io.open("generated.go", "w")
+f:write([[
+// generated by generate.lua, DO NOT EDIT
+package fromlua
+
+import (
+	"github.com/anon55555/mt"
+	"github.com/yuin/gopher-lua"
+)
+
+]] .. funcs .. [[
+func Cmd(l *lua.LState) mt.Cmd {
+	str := l.CheckString(2)
+	switch str {
+]] .. pkt_impl .. [[
+	}
+
+	panic("invalid packet type: " + str)
+}
+]])
+f:close()
diff --git a/fromlua/generated.go b/fromlua/generated.go
new file mode 100644
index 0000000..c93c229
--- /dev/null
+++ b/fromlua/generated.go
@@ -0,0 +1,320 @@
+// generated by generate.lua, DO NOT EDIT
+package fromlua
+
+import (
+	"github.com/anon55555/mt"
+	"github.com/yuin/gopher-lua"
+)
+
+func readAOID(l *lua.LState, val lua.LValue, ptr *mt.AOID) {
+	if val.Type() != lua.LTNumber {
+		panic("invalid value for AOID: must be a number")
+	}
+	*ptr = mt.AOID(val.(lua.LNumber))
+}
+
+func readCompressionModes(l *lua.LState, val lua.LValue, ptr *mt.CompressionModes) {
+	if val.Type() != lua.LTNumber {
+		panic("invalid value for CompressionModes: must be a number")
+	}
+	*ptr = mt.CompressionModes(val.(lua.LNumber))
+}
+
+func readInt16(l *lua.LState, val lua.LValue, ptr *int16) {
+	if val.Type() != lua.LTNumber {
+		panic("invalid value for int16: must be a number")
+	}
+	*ptr = int16(val.(lua.LNumber))
+}
+
+func readInt32(l *lua.LState, val lua.LValue, ptr *int32) {
+	if val.Type() != lua.LTNumber {
+		panic("invalid value for int32: must be a number")
+	}
+	*ptr = int32(val.(lua.LNumber))
+}
+
+func readInteraction(l *lua.LState, val lua.LValue, ptr *mt.Interaction) {
+	if val.Type() != lua.LTString {
+		panic("invalid value for Interaction: must be a string")
+	}
+	str := string(val.(lua.LString))
+	switch str {
+	case "dig":
+		*ptr = mt.Dig
+	case "stop_digging":
+		*ptr = mt.StopDigging
+	case "dug":
+		*ptr = mt.Dug
+	case "place":
+		*ptr = mt.Place
+	case "use":
+		*ptr = mt.Use
+	case "activate":
+		*ptr = mt.Activate
+	default:
+		panic("invalid value for interaction: " + str)
+	}
+}
+
+func readKeys(l *lua.LState, val lua.LValue, ptr *mt.Keys) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for Keys: must be a table")
+	}
+	if l.GetField(val, "forward") == lua.LTrue {
+		*ptr = *ptr | mt.ForwardKey
+	}
+	if l.GetField(val, "backward") == lua.LTrue {
+		*ptr = *ptr | mt.BackwardKey
+	}
+	if l.GetField(val, "left") == lua.LTrue {
+		*ptr = *ptr | mt.LeftKey
+	}
+	if l.GetField(val, "right") == lua.LTrue {
+		*ptr = *ptr | mt.RightKey
+	}
+	if l.GetField(val, "jump") == lua.LTrue {
+		*ptr = *ptr | mt.JumpKey
+	}
+	if l.GetField(val, "special") == lua.LTrue {
+		*ptr = *ptr | mt.SpecialKey
+	}
+	if l.GetField(val, "sneak") == lua.LTrue {
+		*ptr = *ptr | mt.SneakKey
+	}
+	if l.GetField(val, "dig") == lua.LTrue {
+		*ptr = *ptr | mt.DigKey
+	}
+	if l.GetField(val, "place") == lua.LTrue {
+		*ptr = *ptr | mt.PlaceKey
+	}
+	if l.GetField(val, "zoom") == lua.LTrue {
+		*ptr = *ptr | mt.ZoomKey
+	}
+}
+
+func readPlayerPos(l *lua.LState, val lua.LValue, ptr *mt.PlayerPos) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for PlayerPos: must be a table")
+	}
+	readUint8(l, l.GetField(val, "fov80"), &ptr.FOV80)
+	readKeys(l, l.GetField(val, "keys"), &ptr.Keys)
+	readInt32(l, l.GetField(val, "pitch100"), &ptr.Pitch100)
+	readVec3Int32(l, l.GetField(val, "pos100"), &ptr.Pos100)
+	readVec3Int32(l, l.GetField(val, "vel100"), &ptr.Vel100)
+	readUint8(l, l.GetField(val, "wanted_range"), &ptr.WantedRange)
+	readInt32(l, l.GetField(val, "yaw100"), &ptr.Yaw100)
+}
+
+func readSliceSoundID(l *lua.LState, val lua.LValue, ptr *[]mt.SoundID) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for []SoundID: must be a table")
+	}
+	tbl := val.(*lua.LTable)
+	n := tbl.MaxN()
+	*ptr = make([]mt.SoundID, n)
+	for i := range *ptr {
+		readSoundID(l, l.RawGetInt(tbl, i+1), &(*ptr)[i])
+	}
+}
+
+func readSliceString(l *lua.LState, val lua.LValue, ptr *[]string) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for []string: must be a table")
+	}
+	tbl := val.(*lua.LTable)
+	n := tbl.MaxN()
+	*ptr = make([]string, n)
+	for i := range *ptr {
+		readString(l, l.RawGetInt(tbl, i+1), &(*ptr)[i])
+	}
+}
+
+func readSliceVec3Int16(l *lua.LState, val lua.LValue, ptr *[][3]int16) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for [][3]int16: must be a table")
+	}
+	tbl := val.(*lua.LTable)
+	n := tbl.MaxN()
+	*ptr = make([][3]int16, n)
+	for i := range *ptr {
+		readVec3Int16(l, l.RawGetInt(tbl, i+1), &(*ptr)[i])
+	}
+}
+
+func readSoundID(l *lua.LState, val lua.LValue, ptr *mt.SoundID) {
+	if val.Type() != lua.LTNumber {
+		panic("invalid value for SoundID: must be a number")
+	}
+	*ptr = mt.SoundID(val.(lua.LNumber))
+}
+
+func readUint16(l *lua.LState, val lua.LValue, ptr *uint16) {
+	if val.Type() != lua.LTNumber {
+		panic("invalid value for uint16: must be a number")
+	}
+	*ptr = uint16(val.(lua.LNumber))
+}
+
+func readUint8(l *lua.LState, val lua.LValue, ptr *uint8) {
+	if val.Type() != lua.LTNumber {
+		panic("invalid value for uint8: must be a number")
+	}
+	*ptr = uint8(val.(lua.LNumber))
+}
+
+func readVec3Int16(l *lua.LState, val lua.LValue, ptr *[3]int16) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for [3]int16: must be a table")
+	}
+	readInt16(l, l.GetField(val, "x"), &(*ptr)[0])
+	readInt16(l, l.GetField(val, "y"), &(*ptr)[1])
+	readInt16(l, l.GetField(val, "z"), &(*ptr)[2])
+}
+
+func readVec3Int32(l *lua.LState, val lua.LValue, ptr *[3]int32) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for [3]int32: must be a table")
+	}
+	readInt32(l, l.GetField(val, "x"), &(*ptr)[0])
+	readInt32(l, l.GetField(val, "y"), &(*ptr)[1])
+	readInt32(l, l.GetField(val, "z"), &(*ptr)[2])
+}
+
+func Cmd(l *lua.LState) mt.Cmd {
+	str := l.CheckString(2)
+	switch str {
+	case "chat_msg":
+		ptr := &mt.ToSrvChatMsg{}
+		val := l.CheckTable(3)
+		readString(l, l.GetField(val, "msg"), &ptr.Msg)
+		return ptr
+	case "clt_ready":
+		ptr := &mt.ToSrvCltReady{}
+		val := l.CheckTable(3)
+		readUint16(l, l.GetField(val, "formspec"), &ptr.Formspec)
+		readUint8(l, l.GetField(val, "major"), &ptr.Major)
+		readUint8(l, l.GetField(val, "minor"), &ptr.Minor)
+		readUint8(l, l.GetField(val, "patch"), &ptr.Patch)
+		readString(l, l.GetField(val, "version"), &ptr.Version)
+		return ptr
+	case "deleted_blks":
+		ptr := &mt.ToSrvDeletedBlks{}
+		val := l.CheckTable(3)
+		readSliceVec3Int16(l, l.GetField(val, "blks"), &ptr.Blks)
+		return ptr
+	case "fall_dmg":
+		ptr := &mt.ToSrvFallDmg{}
+		val := l.CheckTable(3)
+		readUint16(l, l.GetField(val, "amount"), &ptr.Amount)
+		return ptr
+	case "first_srp":
+		ptr := &mt.ToSrvFirstSRP{}
+		val := l.CheckTable(3)
+		readBool(l, l.GetField(val, "empty_passwd"), &ptr.EmptyPasswd)
+		readSliceByte(l, l.GetField(val, "salt"), &ptr.Salt)
+		readSliceByte(l, l.GetField(val, "verifier"), &ptr.Verifier)
+		return ptr
+	case "got_blks":
+		ptr := &mt.ToSrvGotBlks{}
+		val := l.CheckTable(3)
+		readSliceVec3Int16(l, l.GetField(val, "blks"), &ptr.Blks)
+		return ptr
+	case "init":
+		ptr := &mt.ToSrvInit{}
+		val := l.CheckTable(3)
+		readUint16(l, l.GetField(val, "max_proto_ver"), &ptr.MaxProtoVer)
+		readUint16(l, l.GetField(val, "min_proto_ver"), &ptr.MinProtoVer)
+		readString(l, l.GetField(val, "player_name"), &ptr.PlayerName)
+		readBool(l, l.GetField(val, "send_full_item_meta"), &ptr.SendFullItemMeta)
+		readUint8(l, l.GetField(val, "serialize_ver"), &ptr.SerializeVer)
+		readCompressionModes(l, l.GetField(val, "supported_compression"), &ptr.SupportedCompression)
+		return ptr
+	case "init2":
+		ptr := &mt.ToSrvInit2{}
+		val := l.CheckTable(3)
+		readString(l, l.GetField(val, "lang"), &ptr.Lang)
+		return ptr
+	case "interact":
+		ptr := &mt.ToSrvInteract{}
+		val := l.CheckTable(3)
+		readInteraction(l, l.GetField(val, "action"), &ptr.Action)
+		readUint16(l, l.GetField(val, "item_slot"), &ptr.ItemSlot)
+		readPointedThing(l, l.GetField(val, "pointed"), &ptr.Pointed)
+		readPlayerPos(l, l.GetField(val, "pos"), &ptr.Pos)
+		return ptr
+	case "inv_action":
+		ptr := &mt.ToSrvInvAction{}
+		val := l.CheckTable(3)
+		readString(l, l.GetField(val, "action"), &ptr.Action)
+		return ptr
+	case "inv_fields":
+		ptr := &mt.ToSrvInvFields{}
+		val := l.CheckTable(3)
+		readSliceField(l, l.GetField(val, "fields"), &ptr.Fields)
+		readString(l, l.GetField(val, "formname"), &ptr.Formname)
+		return ptr
+	case "join_mod_chan":
+		ptr := &mt.ToSrvJoinModChan{}
+		val := l.CheckTable(3)
+		readString(l, l.GetField(val, "channel"), &ptr.Channel)
+		return ptr
+	case "leave_mod_chan":
+		ptr := &mt.ToSrvLeaveModChan{}
+		val := l.CheckTable(3)
+		readString(l, l.GetField(val, "channel"), &ptr.Channel)
+		return ptr
+	case "msg_mod_chan":
+		ptr := &mt.ToSrvMsgModChan{}
+		val := l.CheckTable(3)
+		readString(l, l.GetField(val, "channel"), &ptr.Channel)
+		readString(l, l.GetField(val, "msg"), &ptr.Msg)
+		return ptr
+	case "nil":
+		ptr := &mt.ToSrvNil{}
+		return ptr
+	case "node_meta_fields":
+		ptr := &mt.ToSrvNodeMetaFields{}
+		val := l.CheckTable(3)
+		readSliceField(l, l.GetField(val, "fields"), &ptr.Fields)
+		readString(l, l.GetField(val, "formname"), &ptr.Formname)
+		readVec3Int16(l, l.GetField(val, "pos"), &ptr.Pos)
+		return ptr
+	case "player_pos":
+		ptr := &mt.ToSrvPlayerPos{}
+		val := l.CheckTable(3)
+		readPlayerPos(l, l.GetField(val, "pos"), &ptr.Pos)
+		return ptr
+	case "removed_sounds":
+		ptr := &mt.ToSrvRemovedSounds{}
+		val := l.CheckTable(3)
+		readSliceSoundID(l, l.GetField(val, "ids"), &ptr.IDs)
+		return ptr
+	case "req_media":
+		ptr := &mt.ToSrvReqMedia{}
+		val := l.CheckTable(3)
+		readSliceString(l, l.GetField(val, "filenames"), &ptr.Filenames)
+		return ptr
+	case "respawn":
+		ptr := &mt.ToSrvRespawn{}
+		return ptr
+	case "select_item":
+		ptr := &mt.ToSrvSelectItem{}
+		val := l.CheckTable(3)
+		readUint16(l, l.GetField(val, "slot"), &ptr.Slot)
+		return ptr
+	case "srp_bytes_a":
+		ptr := &mt.ToSrvSRPBytesA{}
+		val := l.CheckTable(3)
+		readSliceByte(l, l.GetField(val, "a"), &ptr.A)
+		readBool(l, l.GetField(val, "no_sha1"), &ptr.NoSHA1)
+		return ptr
+	case "srp_bytes_m":
+		ptr := &mt.ToSrvSRPBytesM{}
+		val := l.CheckTable(3)
+		readSliceByte(l, l.GetField(val, "m"), &ptr.M)
+		return ptr
+	}
+
+	panic("invalid packet type: " + str)
+}
diff --git a/fromlua/static.go b/fromlua/static.go
new file mode 100644
index 0000000..b989db8
--- /dev/null
+++ b/fromlua/static.go
@@ -0,0 +1,59 @@
+package fromlua
+
+import (
+	"github.com/anon55555/mt"
+	"github.com/yuin/gopher-lua"
+)
+
+//go:generate ./generate.lua
+
+func readBool(l *lua.LState, val lua.LValue, ptr *bool) {
+	if val.Type() != lua.LTBool {
+		panic("invalid value for bool: must be a boolean")
+	}
+	*ptr = bool(val.(lua.LBool))
+}
+
+func readString(l *lua.LState, val lua.LValue, ptr *string) {
+	if val.Type() != lua.LTString {
+		panic("invalid value for string: must be a string")
+	}
+	*ptr = string(val.(lua.LString))
+}
+
+func readSliceByte(l *lua.LState, val lua.LValue, ptr *[]byte) {
+	if val.Type() != lua.LTString {
+		panic("invalid value for []byte: must be a string")
+	}
+	*ptr = []byte(val.(lua.LString))
+}
+
+func readSliceField(l *lua.LState, val lua.LValue, ptr *[]mt.Field) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for []Field: must be a table")
+	}
+	val.(*lua.LTable).ForEach(func(k, v lua.LValue) {
+		if k.Type() != lua.LTString || v.Type() != lua.LTString {
+			panic("invalid value for Field: key and value must be strings")
+		}
+		*ptr = append(*ptr, mt.Field{Name: string(k.(lua.LString)), Value: string(v.(lua.LString))})
+	})
+}
+
+func readPointedThing(l *lua.LState, val lua.LValue, ptr *mt.PointedThing) {
+	if val.Type() != lua.LTTable {
+		panic("invalid value for PointedThing: must be a table")
+	}
+	id := l.GetField(val, "id")
+
+	if id == lua.LNil {
+		pt := &mt.PointedAO{}
+		readAOID(l, id, &(*pt).ID)
+		*ptr = pt
+	} else {
+		pt := &mt.PointedNode{}
+		readVec3Int16(l, l.GetField(val, "under"), &(*pt).Under)
+		readVec3Int16(l, l.GetField(val, "above"), &(*pt).Above)
+		*ptr = pt
+	}
+}