dfhack/plugins/Dfusion/include/lune.h

362 lines
11 KiB
C++

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