add gs

RCCService2018/content/Rhodium/Modules/Test4R/createModdableFunction.lua

@@ -0,0 +1,39 @@
+--[[createModdableFunction can be used to build a Moddable function in a chain style
+	for example:
+		validModifiers = {
+			protected = Enums.Modifier.Protect,
+			skipped = Enums.Modifier.Skip,
+		}
+		describe = createModdableFunction(validModifiers, callback)
+		describe.protected.skipped("description", function() end)
+		step.skipped("description", function() end)
+]]
+
+local function createModdableFunction(validModifiers, method, appliedModifiers)
+	if appliedModifiers == nil then
+		appliedModifiers = {}
+	end
+
+	return setmetatable({}, {
+		__call = function(_, ...)
+			return method(appliedModifiers, ...)
+		end,
+		__index = function(_, key)
+			if not validModifiers[key] then
+				error(("%q is not a valid modifier"):format(tostring(key)), 2)
+			end
+
+			local newAppliedModifiers = {}
+
+			for key, value in pairs(appliedModifiers) do
+				newAppliedModifiers[key] = value
+			end
+
+			newAppliedModifiers[validModifiers[key]] = true
+
+			return createModdableFunction(validModifiers, method, newAppliedModifiers)
+		end,
+	})
+end
+
+return createModdableFunction