Add reserved words (#3201)

Author: Denneisk

lua/entities/gmod_wire_expression2/base/tokenizer.lua

@@ -15,6 +15,7 @@
 AddCSLuaFile()
 
 local Trace, Warning, Error = E2Lib.Debug.Trace, E2Lib.Debug.Warning, E2Lib.Debug.Error
+local ReservedWord = E2Lib.ReservedWord
 
 local tonumber = tonumber
 local string_find, string_gsub, string_sub = string.find, string.gsub, string.sub
@@ -269,6 +270,7 @@ function Tokenizer:Next()
 		elseif match == "false" then
 			return Token.new(TokenVariant.Boolean, false)
 		elseif string_sub(match, 1, 1) ~= "#" then
+			if ReservedWord[match] then self:Warning("'".. match .. "' is a reserved identifier and may break your code in the future") end
 			return Token.new(TokenVariant.LowerIdent, match)
 		end
 	end

lua/entities/gmod_wire_expression2/core/e2lib.lua

@@ -653,6 +653,59 @@ local Keyword = {
 
 E2Lib.Keyword = Keyword
 
+--- A list of every word that we might use in the future
+E2Lib.ReservedWord = {
+	abstract = true,
+	as = true,
+	await = true,
+	async = true,
+	class = true,
+	constructor = true,
+	debugger = true,
+	declare = true,
+	default = true,
+	delete = true,
+	enum = true,
+	export = true,
+	extends = true,
+	["false"] = true,
+	finally = true,
+	from = true,
+	implements = true,
+	import = true,
+	["in"] = true,
+	instanceof = true,
+	interface = true,
+	match = true,
+	macro = true,
+	mod = true,
+	module = true,
+	mut = true,
+	namespace = true,
+	new = true,
+	null = true,
+	of = true,
+	package = true,
+	private = true,
+	protected =true,
+	public = true,
+	require = true,
+	static = true,
+	struct = true,
+	super = true,
+	this = true,
+	throw = true,
+	throws = true,
+	["true"] = true,
+	type = true,
+	typeof = true,
+	undefined = true,
+	union = true,
+	use = true,
+	yield = true,
+	var = true,
+}
+
 ---@type table<string, Keyword>
 E2Lib.KeywordLookup = {}