rename folder src to concord

concord/component.lua

@@ -0,0 +1,55 @@
+--- Component
+-- A Component is a pure data container.
+-- A Component is contained by a single entity.
+
+local Component = {}
+Component.__mt = {
+   __index = Component,
+}
+
+--- Creates a new ComponentClass.
+-- @param populate Function that populates a Component with values
+-- @return A new ComponentClass
+function Component.new(populate)
+   if (type(populate) ~= "function" and type(populate) ~= "nil") then
+      error("bad argument #1 to 'Component.new' (function/nil expected, got "..type(populate)..")", 2)
+   end
+
+   local componentClass = setmetatable({
+      __populate = populate,
+
+      __isComponentClass = true,
+   }, Component.__mt)
+
+   componentClass.__mt = {
+      __index = componentClass
+   }
+
+   return componentClass
+end
+
+--- Internal: Populates a Component with values
+function Component:__populate() -- luacheck: ignore
+end
+
+--- Internal: Creates and populates a new Component.
+-- @param ... Varargs passed to the populate function
+-- @return A new populated Component
+function Component:__initialize(...)
+   local component = setmetatable({
+      __componentClass = self,
+
+      __isComponent     = true,
+      __isComponentClass = false,
+   }, self)
+
+   self.__populate(component, ...)
+
+   return component
+end
+
+return setmetatable(Component, {
+   __call = function(_, ...)
+      return Component.new(...)
+   end,
+})