实用指南：toLua[六] Examples 05_LuaCoroutine分析
一.运行工程
本例展示Lua模拟Unity的Coroutine携程
二.C#代码分析
using UnityEngine;
using System;
using System.Collections;
using LuaInterface;
//例子5和6展示的两套协同系统勿交叉使用，此为推荐方案
public class TestCoroutine : MonoBehaviour
{
public TextAsset luaFile = null;
private LuaState lua = null;
private LuaLooper looper = null;
void Awake ()
{
#if UNITY_5 || UNITY_2017 || UNITY_2018
Application.logMessageReceived += ShowTips;
#else
Application.RegisterLogCallback(ShowTips);
#endif
new LuaResLoader();
lua = new LuaState();
lua.Start();
LuaBinder.Bind(lua);
DelegateFactory.Init();
looper = gameObject.AddComponent();
looper.luaState = lua;
lua.DoString(luaFile.text, "TestLuaCoroutine.lua");
LuaFunction f = lua.GetFunction("TestCortinue");
f.Call();
f.Dispose();
f = null;
}
void OnApplicationQuit()
{
looper.Destroy();
lua.Dispose();
lua = null;
#if UNITY_5 || UNITY_2017 || UNITY_2018
Application.logMessageReceived -= ShowTips;
#else
Application.RegisterLogCallback(null);
#endif
}
string tips = null;
void ShowTips(string msg, string stackTrace, LogType type)
{
tips += msg;
tips += "\r\n";
}
void OnGUI()
{
GUI.Label(new Rect(Screen.width / 2 - 300, Screen.height / 2 - 200, 600, 400), tips);
if (GUI.Button(new Rect(50, 50, 120, 45), "Start Counter"))
{
tips = null;
LuaFunction func = lua.GetFunction("StartDelay");
func.Call();
func.Dispose();
}
else if (GUI.Button(new Rect(50, 150, 120, 45), "Stop Counter"))
{
LuaFunction func = lua.GetFunction("StopDelay");
func.Call();
func.Dispose();
}
else if (GUI.Button(new Rect(50, 250, 120, 45), "GC"))
{
lua.DoString("collectgarbage('collect')", "TestCoroutine.cs");
Resources.UnloadUnusedAssets();
}
}
} 2.1 DoString执行文件的方式
首先来看第九行：
public TextAsset luaFile = null;TextAsset类可以获取文件的文本内容；用TextAsset.text可以访问文件的文本
因此第28行可以用DoString来执行TestLuaCoroutine.lua文件
lua.DoString(luaFile.text, "TestLuaCoroutine.lua");故本例演示了除LuaState：DoFile(string fileName)和LuaState：Require(string fileName)之外执行Lua文件的第三种方式
Unity手册的解释：
文本资源的一个特性就在于它可用于存储二进制数据。通过为文件提供扩展名 .bytes，即可将其作为文本资源加载，并可通过 bytes 属性来访问数据。
这解释了TestLuaCoroutine文件为什么以.bytes为后缀名
参考：
2.2 LuaLooper类
第25行给对象加了脚本组件LuaLooper
looper = gameObject.AddComponent(); /*
Copyright (c) 2015-2017 topameng(topameng@qq.com)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
using System;
using UnityEngine;
using LuaInterface;
public class LuaLooper : MonoBehaviour
{
public LuaBeatEvent UpdateEvent
{
get;
private set;
}
public LuaBeatEvent LateUpdateEvent
{
get;
private set;
}
public LuaBeatEvent FixedUpdateEvent
{
get;
private set;
}
public LuaState luaState = null;
void Start()
{
try
{
UpdateEvent = GetEvent("UpdateBeat");
LateUpdateEvent = GetEvent("LateUpdateBeat");
FixedUpdateEvent = GetEvent("FixedUpdateBeat");
}
catch (Exception e)
{
Destroy(this);
throw e;
}
}
LuaBeatEvent GetEvent(string name)
{
LuaTable table = luaState.GetTable(name);
if (table == null)
{
throw new LuaException(string.Format("Lua table {0} not exists", name));
}
LuaBeatEvent e = new LuaBeatEvent(table);
table.Dispose();
table = null;
return e;
}
void ThrowException()
{
string error = luaState.LuaToString(-1);
luaState.LuaPop(2);
throw new LuaException(error, LuaException.GetLastError());
}
void Update()
{
#if UNITY_EDITOR
if (luaState == null)
{
return;
}
#endif
if (luaState.LuaUpdate(Time.deltaTime, Time.unscaledDeltaTime) != 0)
{
ThrowException();
}
luaState.LuaPop(1);
luaState.Collect();
#if UNITY_EDITOR
luaState.CheckTop();
#endif
}
void LateUpdate()
{
#if UNITY_EDITOR
if (luaState == null)
{
return;
}
#endif
if (luaState.LuaLateUpdate() != 0)
{
ThrowException();
}
luaState.LuaPop(1);
}
void FixedUpdate()
{
#if UNITY_EDITOR
if (luaState == null)
{
return;
}
#endif
if (luaState.LuaFixedUpdate(Time.fixedDeltaTime) != 0)
{
ThrowException();
}
luaState.LuaPop(1);
}
public void Destroy()
{
if (luaState != null)
{
if (UpdateEvent != null)
{
UpdateEvent.Dispose();
UpdateEvent = null;
}
if (LateUpdateEvent != null)
{
LateUpdateEvent.Dispose();
LateUpdateEvent = null;
}
if (FixedUpdateEvent != null)
{
FixedUpdateEvent.Dispose();
FixedUpdateEvent = null;
}
luaState = null;
}
}
void OnDestroy()
{
if (luaState != null)
{
Destroy();
}
}
}LuaLooper的作用是驱动协程的运行，这里暂不作展开
三.Lua代码分析
3.1 TestLuaCoroutine.lua.bytes
function fib(n)
local a, b = 0, 1
while n > 0 do
a, b = b, a + b
n = n - 1
end
return a
end
function CoFunc()
print('Coroutine started')
for i = 0, 10, 1 do
print(fib(i))
coroutine.wait(0.1)
end
print("current frameCount: "..Time.frameCount)
coroutine.step()
print("yield frameCount: "..Time.frameCount)
local www = UnityEngine.WWW("http://www.baidu.com")
coroutine.www(www)
local s = tolua.tolstring(www.bytes)
print(s:sub(1, 128))
print('Coroutine ended')
end
function TestCortinue()
coroutine.start(CoFunc)
end
local coDelay = nil
function Delay()
local c = 1
while true do
coroutine.wait(1)
print("Count: "..c)
c = c + 1
end
end
function StartDelay()
coDelay = coroutine.start(Delay)
end
function StopDelay()
coroutine.stop(coDelay)
end* fib函数负责计算一个斐那波契n <br>
* coroutine.start 启动一个lua协同 <br>
* coroutine.wait 协同中等待一段时间，单位:秒 <br>
* coroutine.step 协同中等待一帧. <br>
* coroutine.www 等待一个WWW完成. <br>
* tolua.tolstring 转换byte数组为lua字符串缓冲 <br>
* coroutine.stop 停止一个正在lua将要执行的协同 <br>
TestLuaCoroutine中全部围绕者全局模块coroutine中函数的使用，接下来看coroutine模块
3.2 coroutine.lua
local create = coroutine.create
local running = coroutine.running
local resume = coroutine.resume
local yield = coroutine.yield
local error = error
local unpack = unpack
local debug = debug
local FrameTimer = FrameTimer
local CoTimer = CoTimer
local comap = {}
local pool = {}
setmetatable(comap, {__mode = "kv"})
function coroutine.start(f, ...)
local co = create(f)
if running() == nil then
local flag, msg = resume(co, ...)
if not flag then
error(debug.traceback(co, msg))
end
else
local args = {...}
local timer = nil
local action = function()
comap[co] = nil
timer.func = nil
local flag, msg = resume(co, unpack(args))
table.insert(pool, timer)
if not flag then
timer:Stop()
error(debug.traceback(co, msg))
end
end
if #pool > 0 then
timer = table.remove(pool)
timer:Reset(action, 0, 1)
else
timer = FrameTimer.New(action, 0, 1)
end
comap[co] = timer
timer:Start()
end
return co
end
function coroutine.wait(t, co, ...)
local args = {...}
co = co or running()
local timer = nil
local action = function()
comap[co] = nil
timer.func = nil
local flag, msg = resume(co, unpack(args))
if not flag then
timer:Stop()
error(debug.traceback(co, msg))
return
end
end
timer = CoTimer.New(action, t, 1)
comap[co] = timer
timer:Start()
return yield()
end
function coroutine.step(t, co, ...)
local args = {...}
co = co or running()
local timer = nil
local action = function()
comap[co] = nil
timer.func = nil
local flag, msg = resume(co, unpack(args))
table.insert(pool, timer)
if not flag then
timer:Stop()
error(debug.traceback(co, msg))
return
end
end
if #pool > 0 then
timer = table.remove(pool)
timer:Reset(action, t or 1, 1)
else
timer = FrameTimer.New(action, t or 1, 1)
end
comap[co] = timer
timer:Start()
return yield()
end
function coroutine.www(www, co)
co = co or running()
local timer = nil
local action = function()
if not www.isDone then
return
end
comap[co] = nil
timer:Stop()
timer.func = nil
local flag, msg = resume(co)
table.insert(pool, timer)
if not flag then
error(debug.traceback(co, msg))
return
end
end
if #pool > 0 then
timer = table.remove(pool)
timer:Reset(action, 1, -1)
else
timer = FrameTimer.New(action, 1, -1)
end
comap[co] = timer
timer:Start()
return yield()
end
function coroutine.stop(co)
local timer = comap[co]
if timer ~= nil then
comap[co] = nil
timer:Stop()
end
end哪里导入了coroutine模块呢，全局搜索coroutine"可以看到是tolua.lua的require
3.3 tolua.lua
if jit then
if jit.opt then
jit.opt.start(3)
end
print("ver"..jit.version_num.." jit: ", jit.status())
print(string.format("os: %s, arch: %s", jit.os, jit.arch))
end
if DebugServerIp then
require("mobdebug").start(DebugServerIp)
end
require "misc.functions"
Mathf = require "UnityEngine.Mathf"
Vector3 = require "UnityEngine.Vector3"
Quaternion = require "UnityEngine.Quaternion"
Vector2 = require "UnityEngine.Vector2"
Vector4 = require "UnityEngine.Vector4"
Color = require "UnityEngine.Color"
Ray = require "UnityEngine.Ray"
Bounds = require "UnityEngine.Bounds"
RaycastHit = require "UnityEngine.RaycastHit"
Touch = require "UnityEngine.Touch"
LayerMask = require "UnityEngine.LayerMask"
Plane = require "UnityEngine.Plane"
Time = reimport "UnityEngine.Time"
list = require "list"
utf8 = require "misc.utf8"
require "event"
require "typeof"
require "slot"
require "System.Timer"
require "System.coroutine"
require "System.ValueType"
require "System.Reflection.BindingFlags"可以看到tolua.lua对同级目录包括子目录(LuaFramework\ToLua\Lua)下多个lua文件进行require
3.4 tolua库的导入
通过搜索tolua.lua可以看到其执行来自在LuaState
Tip:lua文件的执行如果搜索名称没搜到需要加.lua后缀名一起搜索
LuaState.cs：
void OpenBaseLuaLibs()
{
DoFile("tolua.lua"); //tolua table名字已经存在了,不能用require
LuaUnityLibs.OpenLuaLibs(L);
}四.小结
至此，该携程example所涉及代码及其先后执行逻辑有了整体的把握和理解，具体coroutine的实现先没有深究的必要，等用到时再回来看即可
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