From 9f5317a30c197eb0f0707b80dab6264083b758c5 Mon Sep 17 00:00:00 2001
From: Tiny <Xiaof_Zheng@163.com>
Date: Fri, 13 Aug 2021 13:40:45 +0800
Subject: [PATCH] =?UTF-8?q?lua=E6=A1=86=E6=9E=B6=E5=BA=95=E5=B1=82?=
 =?UTF-8?q?=E6=8F=90=E4=BA=A4?=
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---
 Assets/Script/Xlua/LuaScript/LuaClass.lua | 80 ++++++++++++++++++++++-
 1 file changed, 78 insertions(+), 2 deletions(-)

diff --git a/Assets/Script/Xlua/LuaScript/LuaClass.lua b/Assets/Script/Xlua/LuaScript/LuaClass.lua
index 3b95e8d..ce2e8ae 100644
--- a/Assets/Script/Xlua/LuaScript/LuaClass.lua
+++ b/Assets/Script/Xlua/LuaScript/LuaClass.lua
@@ -26,8 +26,84 @@ local _mtBaseClass =
     __tostring = _Tostring
 }
 
+--实例化
 local function _Instantiate(self, ...)
+    assert(_IsA(self,"class"),"Class must be called from a class")
+    assert(not _registry.class[self].__abstract,"Can not Instantiate from an abstract class")
+    local instance = _DeepCopy[self]
+    _registry.object[instance] =
+    {
+        __type = "object",
+        __superClass = self,
+        __addr = tostring(instance)
+    }
+    setmetatable(instance, { __index = self,
+        -- 提供gc时的析构调用，由于gc时机不定，所以不要依赖此方法做资源释放
+                             __gc = function(obj)
+                                 if _IsA(obj, "object") and obj.__dtor then
+                                     obj:__dtor()
+                                 end
+                             end,
+                             __tostring = self.__tostring,
+        --__newindex = function(t, k, v) logerror(string.format("'%s' is not exist in %s", k, t)) end
+    })
+    -- 构造调用
+    if self.__ctor then
+        self.__ctor(instance, ...)
+    end
     
+    return instance
+end
+
+--用于判断一个数据的类型，一般用于判断一个table是否是class还是object
+local function _IsA(thing,kind)
+    if kind then
+        assert(kind == "object" or kind == "class","when given,string 'kind' must be a class or an 'object'")
+    end
+    if thing then
+        if _registry.class[thing] then
+            if kind then
+                return _registry.class[thing].__type == kind
+            else
+                return _registry.class[thing].__type
+            end
+        elseif _registry.object[thing] then
+            return _registery.object[thing].__type == kind
+        else
+            return _registery.object[thing].__type
+        end
+        
+    end
+    return false
+end
+
+--深拷贝，针对于luaTable,一般也即为类
+local function  _DeepCopy(t)
+    local r = {}
+    for k, v in pairs(t) do
+        local vtype  = type(v)
+        if vtype == "table" then
+            if _registry.class[v] or _registry.object[v] then
+                r[k] = v
+            else
+                _DeepCopy(v)
+            end
+        elseif(vtype ~= "function") then
+            r[k] = v
+        end
+    end
+end
+
+--普通继承
+local function _Extends(self,name ,flags)
+    assert(_IsA(self,"class"),"Inheritance must be called from a class")
+    assert(not _registry.class[self].__final,"Can not derive from a final class")
+    local class = _CreateClass(name,flags)
+    class.__index = class
+    class.__tostring = _ToString
+    _registry.class[class].__superClass = self
+    _registry.class[self].__subClass = class
+    return setmetatable(class,self)
 end
 
 function _CreateClass(name,flags)
@@ -40,8 +116,8 @@ function _CreateClass(name,flags)
         __name = name,
         __abstract = flags and flags.abstract or false,
         __final = flags and flags.final or false,
-        __superClass = false,
-        __subClass = setmetatable({},{__mode = "k"}),
+        __superClass = false,  --父类
+        __subClass = setmetatable({},{__mode = "k"}), --子类
         __addr = tostring(newClass)
     }
     
-- 
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