Serializable component

You can remove the component to tell Concord an Entity shouldn't be serialized.

It's given automatically on Entity creation, but this can be disabled by changing Entity.SERIALIZE_BY_DEFAULT to false.

concord/builtins/init.lua

@@ -0,0 +1,5 @@
+local PATH = (...):gsub("(%.init)$", "")
+
+return {
+  serializable = require(PATH..".serializable"),
+}

concord/builtins/serializable.lua

@@ -0,0 +1,12 @@
+local PATH = (...):gsub('%.builtins%.[^%.]+$', '')
+
+local Component = require(PATH..".component")
+
+local Serializable = Component("serializable")
+
+function Serializable:serialize ()
+  -- Don't serialize this Component
+  return nil
+end
+
+return Serializable

concord/entity.lua

@@ -8,7 +8,13 @@ local Components = require(PATH..".components")
 local Type       = require(PATH..".type")
 local Utils      = require(PATH..".utils")
 
-local Entity = {}
+-- Initialize built-in Components (as soon as possible)
+local Builtins   = require(PATH..".builtins")
+
+local Entity = {
+   SERIALIZE_BY_DEFAULT = true,
+}
+
 Entity.__mt = {
    __index = Entity,
 }
@@ -31,6 +37,10 @@ function Entity.new(world)
       world:addEntity(e)
    end
 
+   if Entity.SERIALIZE_BY_DEFAULT then
+      e:give("serializable")
+   end
+
    return e
 end
 

concord/world.lua

@@ -323,9 +323,10 @@ function World:serialize()
    for i = 1, self.__entities.size do
       local entity = self.__entities[i]
 
+      if entity.serializable then
          local entityData = entity:serialize()
-
-      data[i] = entityData
+         table.insert(data, entityData)
+      end
    end
 
    return data