Update rbx_dom_lua, using subfolder now

plugin/rbx_dom_lua/PropertyDescriptor.lua

@@ -0,0 +1,80 @@
+local Error = require(script.Parent.Error)
+local customProperties = require(script.Parent.customProperties)
+
+-- A wrapper around a property descriptor from the reflection database with some
+-- extra convenience methods.
+--
+-- The aim of this API is to facilitate looking up a property once, then reading
+-- from it or writing to it multiple times. It's also useful when a consumer
+-- wants to check additional constraints on the property before trying to use
+-- it, like scriptability.
+local PropertyDescriptor = {}
+PropertyDescriptor.__index = PropertyDescriptor
+
+local function get(container, key)
+	return container[key]
+end
+
+local function set(container, key, value)
+	container[key] = value
+end
+
+function PropertyDescriptor.fromRaw(data, className, propertyName)
+	return setmetatable({
+		scriptability = data.Scriptability,
+		className = className,
+		name = propertyName,
+	}, PropertyDescriptor)
+end
+
+function PropertyDescriptor:read(instance)
+	if self.scriptability == "ReadWrite" or self.scriptability == "Read" then
+		local success, value = xpcall(get, debug.traceback, instance, self.name)
+
+		if success then
+			return success, value
+		else
+			return false, Error.new(Error.Kind.Roblox, value)
+		end
+	end
+
+	if self.scriptability == "Custom" then
+		local interface = customProperties[self.className][self.name]
+
+		return interface.read(instance, self.name)
+	end
+
+	if self.scriptability == "None" or self.scriptability == "Write" then
+		local fullName = ("%s.%s"):format(instance.className, self.name)
+
+		return false, Error.new(Error.Kind.PropertyNotReadable, fullName)
+	end
+
+	error(("Internal error: unexpected value of 'scriptability': %s"):format(tostring(self.scriptability)), 2)
+end
+
+function PropertyDescriptor:write(instance, value)
+	if self.scriptability == "ReadWrite" or self.scriptability == "Write" then
+		local success, err = xpcall(set, debug.traceback, instance, self.name, value)
+
+		if success then
+			return success
+		else
+			return false, Error.new(Error.Kind.Roblox, err)
+		end
+	end
+
+	if self.scriptability == "Custom" then
+		local interface = customProperties[self.className][self.name]
+
+		return interface.write(instance, self.name, value)
+	end
+
+	if self.scriptability == "None" or self.scriptability == "Read" then
+		local fullName = ("%s.%s"):format(instance.className, self.name)
+
+		return false, Error.new(Error.Kind.PropertyNotWritable, fullName)
+	end
+end
+
+return PropertyDescriptor