362 lines
11 KiB
C++
362 lines
11 KiB
C++
#ifndef LUNE_H
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#define LUNE_H
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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#include "luaxx.hpp"
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#include <string>
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namespace lua
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{
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class object
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{
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state &myst;
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int myref;
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public:
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object(state &myst):myst(myst)
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{
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myref=luaL_ref(myst,LUA_REGISTRYINDEX);
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}
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~object()
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{
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luaL_unref(myst,LUA_REGISTRYINDEX,myref);
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}
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void Get()
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{
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lua_rawgeti(myst,LUA_REGISTRYINDEX,myref);
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}
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state &GetState(){return myst;};
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};
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class local_object
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{
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state myst;
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int myref;
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static object *mytbl;
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public:
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local_object(lua_State *L)
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{
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myst=state(L);
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//LOG<<"Creating local object...\n";
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//StackDump(L);
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if(!mytbl)
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{
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//LOG<<" Metable...\n";
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myst.newtable(); //2
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if(myst.newmetatable("WEAKTABLE"))//3
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{
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//StackDump(L);
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myst.push("kv"); //4
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myst.setfield("__mode");//3
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//LOG<<" Setting Metable...\n";
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//StackDump(L);
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}
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//LOG<<" Attaching to holder...\n";
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//myst.setfield("__metatable");//2
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lua_setmetatable(myst,-1);
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mytbl=new object(myst);
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//StackDump(L);
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//LOG<<" Done Metatable...\n";
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}
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//StackDump(L);
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mytbl->Get();
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//LOG<<" Got my table...\n";
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//StackDump(L);
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myst.insert(-2);
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myref=luaL_ref(myst,-2);
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//LOG<<"Before pop:";
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//StackDump(L);
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myst.pop(1);
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GetTable();
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//LOG<<"========Done...\n"<<"Ref="<<myref<<"\n";
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//mytbl->Get();
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//StackDump(L);
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//LOG<<"===========================\n";
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}
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~local_object()
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{
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//LOG<<"Deleting local object...\n";
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ReleaseTable();
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}
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void ReleaseTable()
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{
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mytbl->Get();
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int pos=myst.gettop();
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luaL_unref(myst,pos,myref);
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myst.remove(pos);
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}
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state GetState(){return myst;}
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void GetTable()
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{
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//LOG<<"Getting ref="<<myref<<"\n";
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//StackDump(myst);
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//LOG<<"Tbl preget\n";
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mytbl->Get();
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int pos=myst.gettop();
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//StackDump(myst);
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//LOG<<"Tbl get\n";
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//int pos=myst.gettop();
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lua_rawgeti(myst,pos,myref);
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//StackDump(myst);
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//LOG<<"Done\n";
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myst.remove(pos);
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}
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protected:
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};
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};
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template <typename T,bool GC=true>
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class Lune
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{
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public:
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typedef struct
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{
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T *pT;
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int tableref;
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} userdataType;
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typedef int (T::*mfp)(lua_State *L);
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typedef struct
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{
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const char *name;
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mfp mfunc;
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} RegType;
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static void Register(lua_State *L)
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{
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lua_newtable(L);
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int methods = lua_gettop(L);
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luaL_newmetatable(L, T::className);
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int metatable = lua_gettop(L);
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// store method table in globals so that
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// scripts can add functions written in Lua.
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lua_pushstring(L, T::className);
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lua_pushvalue(L, methods);
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lua_settable(L, LUA_GLOBALSINDEX);
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lua_pushliteral(L, "__metatable");
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lua_pushvalue(L, methods);
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lua_settable(L, metatable); // hide metatable from Lua getmetatable()
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lua_pushliteral(L, "__index");
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lua_pushcfunction(L, index_T);
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lua_settable(L, metatable);
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//lua_pushliteral(L, "__name");
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//lua_pushstring(L, T::className);
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//lua_settable(L, metatable);
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lua_pushliteral(L, "__newindex");
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lua_pushcfunction(L, newindex_T);
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lua_settable(L, metatable);
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lua_pushliteral(L, "__instances");
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lua_newtable(L);
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lua_settable(L, metatable);
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if(GC)
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{
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lua_pushliteral(L, "__gc");
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lua_pushcfunction(L, gc_T);
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lua_settable(L, metatable);
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}
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lua_newtable(L); // metatable for method table
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int mt = lua_gettop(L);
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lua_pushliteral(L, "__call");
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lua_pushcfunction(L, new_T);
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lua_pushliteral(L, "new");
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lua_pushvalue(L, -2); // dup new_T function
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lua_settable(L, methods); // add new_T to method table
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lua_settable(L, mt); // mt.__call = new_T
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lua_setmetatable(L, methods);
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//LOG<<"lune: registered class \""<<T::className<<"\"\n";
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// fill method table with methods from class T
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for (RegType *l = T::methods; l->name; l++)
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{
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/* edited by Snaily: shouldn't it be const RegType *l ... ? */
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lua_pushstring(L, l->name);
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lua_pushlightuserdata(L, (void*)l);
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lua_pushcclosure(L, thunk, 1);
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lua_settable(L, methods);
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//LOG<<"lune: method \""<<l->name<<"\"\n";
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}
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lua_pop(L, 2); // drop metatable and method table
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};
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static void GetTable(lua_State *L,T *p)
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{
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GetTableEx(L,p->GetTableId());
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}
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static void GetTableEx(lua_State *L,int id)
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{
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lua::state s(L);
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s.getmetatable(T::className);
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s.getfield("__instances");
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int ins=s.gettop();
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lua_rawgeti(L, ins, id);
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s.insert(-3);
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s.pop(2);
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}
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static T *check(lua_State *L, int narg)
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{
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userdataType *ud =
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static_cast<userdataType*>(luaL_checkudata(L, narg, T::className)); //TODO FIX THIs..
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//(lua_touserdata(L, narg));//
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if(!ud) luaL_typerror(L, narg, T::className);
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return ud->pT; // pointer to T object
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}
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protected:
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private:
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static int RegTable(lua_State *L)
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{
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// LOG<<"Regging....\n";
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//lua::StackDump(L);
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lua::state s(L);
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int ssize=s.gettop();
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//s.getglobal(T::className);
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s.getmetatable(T::className);
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s.getfield("__instances");
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int ins=s.gettop();
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s.newtable();
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int id=luaL_ref(L,ins);
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//LOG<<"After reg:\n";
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//lua::StackDump(L);
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s.settop(ssize);
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return id;
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}
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static void UnregTable(lua_State *L,int id)
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{
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lua::state s(L);
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s.getmetatable(T::className);
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s.getfield("__instances");
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int ins=s.gettop();
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//LOG<<"Unreg table id:"<<id<<"stack dump:\n";
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//lua::StackDump(L);
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luaL_unref(L,ins,id);
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}
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static int index_T(lua_State *L) // calls with (table, key), return value
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{
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lua::state st(L);
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std::string key=st.as<std::string>(-1);
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T *p=check(L,1);
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GetTable(L,p);
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st.insert(-2);
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//LOG<<"Index:\n";
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//lua::StackDump(L);
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lua_rawget(L,-2); //try getting from normal table
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if(st.is<lua::nil>()) //failed
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{
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st.pop(2);
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st.getglobal(T::className); //try class tables then
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st.push(key);
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st.gettable();
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}
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return 1;
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}
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static int newindex_T(lua_State *L)
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{
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//LOG<<"New index....\n";
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//lua::StackDump(L);
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lua::state st(L);
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T *p=check(L,1);
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GetTable(L,p);
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//st.insert(-3);
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//LOG<<"Before set:\n";
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st.insert(-3);
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//lua::StackDump(L);
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lua_rawset(L,-3);
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return 0;
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}
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static int thunk(lua_State *L)
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{
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//LOG<<"Size of stack:"<<lua_gettop(L)<<"\n";
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//lua::StackDump(L);
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if(lua_gettop(L)<1)
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luaL_error(L,"Member function called without 'self'");
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//LOG<<"Size of stack after:"<<lua_gettop(L)<<"\n";
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// stack has userdata, followed by method args
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T *obj = check(L, 1); // get 'self', or if you prefer, 'this'
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//T *obj=static_cast<userdataType*>(lua_touserdata(L,1))->pT;
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lua_remove(L, 1); // remove self so member function args start at index 1
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// get member function from upvalue
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RegType *l = static_cast<RegType*>(lua_touserdata(L, lua_upvalueindex(1)));
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return (obj->*(l->mfunc))(L); // call member function
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}
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static int gc_T(lua_State *L)
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{
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//lua_getfield(L,,"__ud");
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//LOG<<"Garbage collecting.\n";
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//lua::StackDump(L);
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userdataType *ud = static_cast<userdataType*>(lua_touserdata(L, 1));
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T *obj = ud->pT;
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delete obj; // call destructor for T objects
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UnregTable(L,ud->tableref);
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return 0;
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}
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static int new_T(lua_State *L)
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{
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//LOG<<"Pre build:"<<lua_gettop(L)<<"\n";
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//lua::StackDump(L);
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lua_remove(L, 1); // use classname:new(), instead of classname.new()
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//lua_newtable(L);
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int id=RegTable(L);
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//LOG<<"Registred as:"<<id<<"\n";
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//int ssize=lua_gettop(L);
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T *obj = new T(L,id); // call constructor for T objects
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lua_settop(L,0); //no need for parameters later.
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//LOG<<"Post build:"<<lua_gettop(L)<<"\t";
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//lua::StackDump(L);
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//LOG<<"TSOP\n";
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userdataType *ud =
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static_cast<userdataType*>(lua_newuserdata(L, sizeof(userdataType)));
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//lua::StackDump(L);
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luaL_getmetatable(L, T::className); // lookup metatable in Lua registry
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lua_setmetatable(L,-2);
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//LOG<<"metatable set\n";
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//lua::StackDump(L);
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GetTable(L,obj);
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lua_pushliteral(L,"__obj");
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lua_pushvalue(L,-3);
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lua_settable(L,-3);
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lua_pop(L,1);
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//LOG<<"Object referenced\n";
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//lua::StackDump(L);
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//T *p = new(ud) T(L); // call constructor for T objects
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//lua::StackDump(L);
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ud->pT = obj; // store pointer to object in userdata
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ud->tableref=id;
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//luaL_getmetatable(L, T::className); // lookup metatable in Lua registry
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//lua_setmetatable(L, tableindex);
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//lua::StackDump(L);
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//LOG<<"Push done\n";
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return 1; // userdata containing pointer to T object
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}
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Lune() {}; //non constructable...
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};
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#define method(class, name) {#name, &class::name}
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#define DEF_LUNE(class) static const char className[];\
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static Lune<class>::RegType methods[];
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#define DEF_LUNE_NOGC(class) static const char className[];\
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static Lune<class,false>::RegType methods[];
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#define IMP_LUNE(class,lua_name) const char class::className[]=#lua_name;
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#define LUNE_METHODS_START(class) Lune<class>::RegType class::methods[] = {
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#define LUNE_METHODS_START_NOGC(class) Lune<class,false>::RegType class::methods[] = {
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#define LUNE_METHODS_END() {0,0}}
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#endif // LUNE_H
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