diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index d907c43..0000000
--- a/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-*.lua
diff --git a/behave.lua b/behave.lua
new file mode 100644
index 0000000..e931b44
--- /dev/null
+++ b/behave.lua
@@ -0,0 +1,698 @@
+local success = setmetatable({ }, {
+  __tostring = function()
+    return "success"
+  end
+})
+local running = setmetatable({ }, {
+  __tostring = function()
+    return "running"
+  end
+})
+local fail = setmetatable({ }, {
+  __tostring = function()
+    return "fail"
+  end
+})
+local Node
+do
+  local _class_0
+  local _base_0 = {
+    run = function(self)
+      return success
+    end,
+    update = function(self, ...)
+      local result = success
+      if not self.started and self.start then
+        result = self:start(...)
+        self.started = true
+      end
+      if result == success then
+        result = self:run(...)
+      end
+      if result == success then
+        if self.finish then
+          result = self:finish(...)
+        end
+        self.started = false
+      end
+      return result
+    end
+  }
+  _base_0.__index = _base_0
+  _class_0 = setmetatable({
+    __init = function(self, fns)
+      if fns == nil then
+        fns = { }
+      end
+      for key, value in pairs(fns) do
+        self[key] = value
+      end
+      self.success = success
+      self.running = running
+      self.fail = fail
+      self.started = false
+    end,
+    __base = _base_0,
+    __name = "Node"
+  }, {
+    __index = _base_0,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  Node = _class_0
+end
+local Sequence
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      local result = success
+      if self._running then
+        result = self._running:update(...)
+        if not (result == running) then
+          self._running = false
+        end
+      end
+      while result == success and self.index < #self.nodes do
+        self.index = self.index + 1
+        result = self.nodes[self.index]:update(...)
+      end
+      if result == running then
+        self._running = self.nodes[self.index]
+      else
+        self.index = 0
+      end
+      return result
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, nodes)
+      if nodes == nil then
+        nodes = { }
+      end
+      self.nodes = nodes
+      _class_0.__parent.__init(self)
+      self.index = 0
+      self._running = false
+    end,
+    __base = _base_0,
+    __name = "Sequence",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  Sequence = _class_0
+end
+local Selector
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      local result = fail
+      if self._running then
+        result = self._running:update(...)
+        if not (result == running) then
+          self._running = false
+        end
+      end
+      while result == fail and self.index < #self.nodes do
+        self.index = self.index + 1
+        result = self.nodes[self.index]:update(...)
+      end
+      if result == running then
+        self._running = self.nodes[self.index]
+      else
+        self.index = 0
+      end
+      return result
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, nodes)
+      if nodes == nil then
+        nodes = { }
+      end
+      self.nodes = nodes
+      _class_0.__parent.__init(self)
+      self.index = 0
+      self._running = false
+    end,
+    __base = _base_0,
+    __name = "Selector",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  Selector = _class_0
+end
+local Random
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      local index = math.floor(math.random() * #self.nodes + 1)
+      return self.nodes[index]:update(...)
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, nodes)
+      if nodes == nil then
+        nodes = { }
+      end
+      self.nodes = nodes
+      return _class_0.__parent.__init(self)
+    end,
+    __base = _base_0,
+    __name = "Random",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  Random = _class_0
+end
+local RandomSequence
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    shuffle = function(self)
+      self._shuffled = { }
+      for i = 1, #self.nodes do
+        local r = math.random(i)
+        if not (r == i) then
+          self._shuffled[i] = self._shuffled[r]
+        end
+        self._shuffled[r] = self.nodes[i]
+      end
+    end,
+    update = function(self, ...)
+      local result = success
+      if self._running then
+        result = self._running:update(...)
+        if not (result == running) then
+          self._running = false
+        end
+      end
+      local tmp
+      while result == success and #self._shuffled > 0 do
+        result = self._shuffled[1]:update(...)
+        tmp = table.remove(self._shuffled, 1)
+      end
+      if result == running then
+        self._running = tmp
+      else
+        self:shuffle()
+      end
+      return result
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, nodes)
+      if nodes == nil then
+        nodes = { }
+      end
+      self.nodes = nodes
+      _class_0.__parent.__init(self)
+      self._running = false
+      return self:shuffle()
+    end,
+    __base = _base_0,
+    __name = "RandomSequence",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  RandomSequence = _class_0
+end
+local RandomSelector
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    shuffle = function(self)
+      self._shuffled = { }
+      for i = 1, #self.nodes do
+        local r = math.random(i)
+        if not (r == i) then
+          self._shuffled[i] = self._shuffled[r]
+        end
+        self._shuffled[r] = self.nodes[i]
+      end
+    end,
+    update = function(self, ...)
+      local result = fail
+      if self._running then
+        result = self._running:update(...)
+        if not (result == running) then
+          self._running = false
+        end
+      end
+      local tmp
+      while result == fail and #self._shuffled > 0 do
+        result = self._shuffled[1]:update(...)
+        tmp = table.remove(self._shuffled, 1)
+      end
+      if result == running then
+        self._running = tmp
+      else
+        self:shuffle()
+      end
+      return result
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, nodes)
+      if nodes == nil then
+        nodes = { }
+      end
+      self.nodes = nodes
+      _class_0.__parent.__init(self)
+      self._running = false
+      return self:shuffle()
+    end,
+    __base = _base_0,
+    __name = "RandomSelector",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  RandomSelector = _class_0
+end
+local Repeat
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      local result = success
+      if self._running then
+        result = self.node:update(...)
+        if not (result == running) then
+          self._running = false
+        end
+      end
+      while result == success and self.counter < self.cycles do
+        self.counter = self.counter + 1
+        result = self.node:update(...)
+      end
+      if result == running then
+        self._running = true
+      else
+        self.counter = 1
+      end
+      return result
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, cycles, node)
+      if cycles == nil then
+        cycles = 2
+      end
+      if node == nil then
+        node = Node()
+      end
+      self.cycles, self.node = cycles, node
+      _class_0.__parent.__init(self)
+      self.counter = 1
+      self._running = false
+    end,
+    __base = _base_0,
+    __name = "Repeat",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  Repeat = _class_0
+end
+local Succeed
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      if running == self.node:update(...) then
+        return running
+      else
+        return success
+      end
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, node)
+      if node == nil then
+        node = Node()
+      end
+      self.node = node
+      return _class_0.__parent.__init(self)
+    end,
+    __base = _base_0,
+    __name = "Succeed",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  Succeed = _class_0
+end
+local Fail
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      if running == self.node:update(...) then
+        return running
+      else
+        return fail
+      end
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, node)
+      if node == nil then
+        node = Node()
+      end
+      self.node = node
+      return _class_0.__parent.__init(self)
+    end,
+    __base = _base_0,
+    __name = "Fail",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  Fail = _class_0
+end
+local Invert
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      local result = self.node:update(...)
+      if result == running then
+        return running
+      elseif result == success then
+        return fail
+      else
+        return success
+      end
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, node)
+      if node == nil then
+        node = Node()
+      end
+      self.node = node
+      return _class_0.__parent.__init(self)
+    end,
+    __base = _base_0,
+    __name = "Invert",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  Invert = _class_0
+end
+local RunOnce
+do
+  local _class_0
+  local _parent_0 = Node
+  local _base_0 = {
+    update = function(self, ...)
+      if not (self.ran) then
+        local result = self.node:update(...)
+        if not (result == running) then
+          self.run = true
+        end
+        return result
+      else
+        return fail
+      end
+    end
+  }
+  _base_0.__index = _base_0
+  setmetatable(_base_0, _parent_0.__base)
+  _class_0 = setmetatable({
+    __init = function(self, node)
+      if node == nil then
+        node = Node()
+      end
+      self.node = node
+      _class_0.__parent.__init(self)
+      self.ran = false
+    end,
+    __base = _base_0,
+    __name = "RunOnce",
+    __parent = _parent_0
+  }, {
+    __index = function(cls, name)
+      local val = rawget(_base_0, name)
+      if val == nil then
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
+      else
+        return val
+      end
+    end,
+    __call = function(cls, ...)
+      local _self_0 = setmetatable({}, _base_0)
+      cls.__init(_self_0, ...)
+      return _self_0
+    end
+  })
+  _base_0.__class = _class_0
+  if _parent_0.__inherited then
+    _parent_0.__inherited(_parent_0, _class_0)
+  end
+  RunOnce = _class_0
+end
+local behave = {
+  Node = Node,
+  Sequence = Sequence,
+  Selector = Selector,
+  Random = Random,
+  RandomSequence = RandomSequence,
+  RandomSelector = RandomSelector,
+  Repeat = Repeat,
+  Succeed = Succeed,
+  Fail = Fail,
+  Invert = Invert,
+  RunOnce = RunOnce,
+  success = success,
+  running = running,
+  fail = fail
+}
+behave.clone = function(object)
+  local cls = getmetatable(object).__class.__name
+  local new = behave[cls](object)
+  if object.nodes then
+    local nodes = { }
+    for k, v in pairs(object.nodes) do
+      nodes[k] = behave.clone(v)
+    end
+    new.nodes = nodes
+  elseif object.node then
+    new.node = behave.clone(object.node)
+  end
+  return new
+end
+return behave