add gs

RCCService2020/ExtraContent/LuaPackages/SymbolImpl/Symbol.lua

@@ -0,0 +1,43 @@
+--[[
+	A 'Symbol' is an opaque marker type that can be used to signify unique
+	statuses. Symbols have the type 'userdata', but when printed to the console,
+	the name of the symbol is shown.
+]]
+
+local Symbol = {}
+
+--[[
+	Creates a Symbol with the given name.
+
+	When printed or coerced to a string, the symbol will turn into the string
+	given as its name.
+]]
+function Symbol.named(name)
+	assert(type(name) == "string", "Symbols must be created using a string name!")
+
+	local self = newproxy(true)
+
+	local wrappedName = ("Symbol(%s)"):format(name)
+
+	getmetatable(self).__tostring = function()
+		return wrappedName
+	end
+
+	return self
+end
+
+--[[
+	Create an unnamed Symbol. Usually, you should create a named Symbol using
+	Symbol.named(name)
+]]
+function Symbol.unnamed()
+	local self = newproxy(true)
+
+	getmetatable(self).__tostring = function()
+		return "Unnamed Symbol"
+	end
+
+	return self
+end
+
+return Symbol