Rename 'lib' directory to 'src'

src/pool.lua

@@ -0,0 +1,52 @@
+--- Pool
+
+local PATH = (...):gsub('%.[^%.]+$', '')
+
+local List = require(PATH..".list")
+
+local Pool = {}
+Pool.__index = Pool
+
+--- Creates a new Pool
+-- @param name Identifier for the Pool.
+-- @param filter Table containing the required Components
+-- @return The new Pool
+function Pool.new(name, filter)
+   local pool = setmetatable(List(), Pool)
+
+   pool.added   = {}
+   pool.removed = {}
+
+   pool.name   = name
+   pool.filter = filter
+
+   pool.__isPool = true
+
+   return pool
+end
+
+function Pool:flush()
+   for i = 1, math.max(#self.added, #self.removed) do
+      self.added[i], self.removed[i] = nil, nil
+   end
+end
+
+--- Checks if an Entity is eligible for the Pool.
+-- @param e The Entity to check
+-- @return True if the entity is eligible, false otherwise
+function Pool:eligible(e)
+   for _, component in ipairs(self.filter) do
+      if not e[component] or e.removed[component] then
+         return false
+      end
+   end
+
+   return true
+end
+
+return setmetatable(Pool, {
+   __index = List,
+   __call  = function(_, ...)
+      return Pool.new(...)
+   end,
+})