Xlua的状态机

一、基础

1、Unity的C#脚本含有一个可以调用Update的函数

2、Lua中“面向对象”的基础类

二、状态机代码

FSM

Object:subClass("FSMBase")

function FSMBase:CreateFSM(className)
    FSMBase:subClass(className)
    _G[className].defaultFSMStateID = nil
    _G[className].fsmStates         = {}
    _G[className].currentFSMState   = nil
    _G[className].defaultFSMState   = nil
end

-- 初始化状态机
function FSMBase:InitFSM()
    self.currentFSM = self
    self:InitComponent()
    self:InitDefaultState()
    mono:AddUpdateEventListener(function()
        self:Update()
    end)
end

-- 初始化组件 //TODO需要子类处理
function FSMBase:InitComponent()

end

--初始化状态机的默认状态 //TODO需要子类处理
function FSMBase:InitDefaultState()
    self.defaultFSMState = self.fsmStates[self.defaultFSMStateID]
    if self.defaultFSMState == nil then
        error("默认状态不存在" .. self.defaultFSMStateID)
    end
    self.currentFSMState = self.defaultFSMState
    self.currentFSMState:StateEnter(self)
end

--需要依赖MONO工具
function FSMBase:Update()
    if self.currentFSMState ~= nil then
        self.currentFSMState:Reason(self.currentFSM)
        self.currentFSMState:StateStay(self.currentFSM)
    end
end

--更改当前状态
function FSMBase:ChanegActiveState(stateID)
    if self.currentFSMState ~= nil then
        self.currentFSMState:StateExit(self.currentFSM)
    end
    self.currentFSMState = self.fsmStates[stateID]
    print(self.currentFSMState.stateID .. "State ID")
    self.currentFSMState:StateEnter();
    if self.currentFSMState == nil then
        error("默认状态不存在" .. stateID)
        self.currentFSMState:StateStay(self.currentFSM)
    end
end

FSMSate

Object:subClass("FSMStateBase")

function FSMStateBase:CreateFSMState(className)
    FSMStateBase:subClass(className)
    _G[className].stateID = nil;
    _G[className].conditionAndStateMap = {}
    _G[className].fsmConditions = {}
end

function FSMStateBase:AddConditioAndState(conditionID, stateID)
    if not self.conditionAndStateMap[conditionID] == nil then
        error("条件已经存在" .. conditionID)
        return
    end
    self.conditionAndStateMap[conditionID] = stateID
    table.insert(self.fsmConditions, _G[conditionID]:new())
end

function FSMStateBase:Reason(fsm)
    for index, value in ipairs(self.fsmConditions) do
        if value:CheckCondition(fsm) then
            stateID = self.conditionAndStateMap[value.conditionID]
            fsm:ChanegActiveState(stateID)
        end
    end
end

function FSMStateBase:StateEnter(fsm)

end

function FSMStateBase:StateStay(fsm)

end

function FSMStateBase:StateExit(fsm)

end

FSMCondition

Object:subClass("FSMConditionBase")

function FSMConditionBase:CreateFSMCondition(className)
    FSMConditionBase:subClass(className)
    self.conditionID = nil
end

function FSMConditionBase:CheckCondition(fsm)

end

三、使用

1、定义状态机

FSMBase:CreateFSM("TestFSM")

function TestFSM:InitComponent()
    --初始化状态条件列表
    local state1 = TestState1:new()
    local state2 = TestState2:new()
    self.fsmStates[state1.stateID] = state1
    self.fsmStates[state2.stateID] = state2
    state1:AddConditioAndState("TestCondition1", "TestState2")
    state2:AddConditioAndState("TestCondition2", "TestState1")
    --设置默认状态
    self.defaultFSMStateID = "TestState1"
end

2、定义状态

FSMStateBase:CreateFSMState("TestState1")
TestState1.stateID = "TestState1"
function TestState1:StateEnter(fsm)
    print("TestState1 In")
end

function TestState1:StateStay()
    print("TestState1 Stay")
end

function TestState1:StateExit()
    print("TestState1 Out")
end

3、定义条件

FSMConditionBase:CreateFSMCondition("TestCondition1")
TestCondition1.conditionID = "TestCondition1"
function TestCondition1:CheckCondition(fsm)
    return true
end

4、使用状态机