Initial commit

fluid/entity.lua

@@ -0,0 +1,75 @@
+local Entity = {
+   entities = {},
+}
+Entity.__index = Entity
+
+--- Creates and initializes a new Entity.
+-- @return A new Entity
+function Entity.new()
+   local e = setmetatable({
+      id         = #Entity.entities + 1,
+      components = {},
+      systems    = {},
+      keys       = {},
+
+      instance = nil,
+   }, Entity)
+
+   Entity.entities[e.id] = e
+
+   return e
+end
+
+--- Gives an Entity a component with values.
+-- @param component The Component to add
+-- @param ... The values passed to the Component
+-- @return self
+function Entity:give(component, ...)
+   self.components[component] = component:initialize(...)
+
+   return self
+end
+
+--- Removes a component from an Entity.
+-- @param component The Component to remove
+-- @return self
+function Entity:remove(component)
+   self.components[component] = nil
+
+   return self
+end
+
+--- Checks the Entity against the pools again.
+-- @return self
+function Entity:check()
+   self.instance:checkEntity(self)
+
+   return self
+end
+
+--- Removed an Entity from the instance.
+-- @return self
+function Entity:destroy()
+   Entity.entities[self.id] = nil
+   self.instance:destroyEntity(self)
+
+   return self
+end
+
+--- Gets a Component from the Entity
+-- @param component The Component to get
+-- @return The Bag from the Component
+function Entity:get(component)
+   return self.components[component]
+end
+
+--- Returns true if the Entity has the Component
+-- @params component The Component to check against
+-- @return True if the entity has the Bag. False otherwise
+function Entity:has(component)
+   return self.components[component] and true
+end
+
+return setmetatable(Entity, {
+   __call = function(_, ...) return Entity.new(...) end,
+})