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#include "libjin/jin.h"
#include "je_lua.h"
#include "l_object.h"
using namespace std;
using namespace JinEngine::Math;
namespace JinEngine
{
namespace Lua
{
static const char* Jin_Lua_Objects_Table = "Jin_Objects_Table";
static const char* Jin_Lua_Reference_Table = "Jin_Reference_Table";
static const char* Jin_Lua_Modules_Table = "Jin_Modules_Table";
using DepsMap = LuaObject::DepsMap;
LuaObject* luax_newinstance(lua_State* L, const char* type, Shared* shared)
{
LuaObject* obj = static_cast<LuaObject*>(luax_newinstance(L, type, sizeof(LuaObject)));
obj->state = L;
obj->type = type;
obj->bind(shared);
// Add to objects_table, objects_table[shared] = luaObj
luax_getobjectstable(L);
luax_pushlightuserdata(L, shared);
luax_pushvalue(L, -3);
luax_settable(L, -3);
luax_pop(L, 1); // Pop objects table.
return obj;
}
LuaObject* luax_checkobject(lua_State* L, int idx, const char* type)
{
return (LuaObject*)luax_checktype(L, idx, type);
}
LuaObject* luax_copyinstance(lua_State* to, LuaObject* src)
{
if (to == src->state)
return nullptr;
// Copy dependencies.
DepsMap& srcDeps = *src->dependencies;
for (DepsMap::iterator it = srcDeps.begin(); it != srcDeps.end(); ++it)
{
LuaObject* obj = it->second;
Shared* shr = obj->shared;
// Try get lua object.
luax_getobject(src->state, obj);
LuaObject* luaObj = (LuaObject*)luax_checktype(src->state, -1, obj->getObjectType());
luax_pop(src->state, 1); // Pop lua object.
luax_copyinstance(to, luaObj);
luax_pop(to, 1); // Pop reference object.
}
Shared* shr = src->getShared();
LuaObject* obj = luax_newinstance(to, src->getObjectType(), shr);
(*obj->dependencies) = (*src->dependencies);
// Add to objects_table.
luax_getobjectstable(to);
luax_pushlightuserdata(to, shr);
luax_pushvalue(to, -3);
luax_settable(to, -3);
luax_pop(to, 1); // Pop objects table.
// Set dependencies.
DepsMap& deps = *obj->dependencies;
DepsMap::iterator it = deps.begin();
for (; it != deps.end(); ++it)
{
LuaObject* dep = it->second;
luax_addreference(to, src, dep);
}
return obj;
}
int luax_getobject(lua_State* L, LuaObject* obj)
{
luax_getobjectstable(L);
luax_pushlightuserdata(L, obj->shared);
luax_gettable(L, -2);
luax_remove(L, -2); // Remove objects table on stack.
return 1;
}
void luax_removeobject(lua_State* L, LuaObject* obj)
{
luax_getobjectstable(L);
luax_pushlightuserdata(L, obj->shared);
luax_pushnil(L);
luax_settable(L, -3);
luax_pop(L, 1);
}
int luax_getobjectstable(lua_State* L)
{
luax_getfield(L, LUA_REGISTRYINDEX, Jin_Lua_Objects_Table);
// If no such table, add one.
if (luax_isnil(L, -1) || !luax_istable(L, -1))
{
luax_pop(L, 1);
luax_newtable(L);
// metatable
luax_newtable(L);
// weak table
luax_pushliteral(L, "v");
luax_setfield(L, -2, "__mode");
// setmetatable(newtable, metatable)
luax_setmetatable(L, -2);
luax_pushvalue(L, -1);
luax_setfield(L, LUA_REGISTRYINDEX, Jin_Lua_Objects_Table);
}
return 1;
}
int luax_getmodulestable(lua_State* L)
{
luax_getfield(L, LUA_REGISTRYINDEX, Jin_Lua_Modules_Table);
// If no such table, add one.
if (luax_isnil(L, -1) || !luax_istable(L, -1))
{
luax_pop(L, 1);
luax_newtable(L);
// metatable
luax_newtable(L);
// weak table
luax_pushliteral(L, "v");
luax_setfield(L, -2, "__mode");
// setmetatable(newtable, metatable)
luax_setmetatable(L, -2);
luax_pushvalue(L, -1);
luax_setfield(L, LUA_REGISTRYINDEX, Jin_Lua_Modules_Table);
}
return 1;
}
int luax_getreferencestable(lua_State* L)
{
luax_getfield(L, LUA_REGISTRYINDEX, Jin_Lua_Reference_Table);
// If no such table, add one.
if (luax_isnil(L, -1) || !luax_istable(L, -1))
{
luax_pop(L, 1);
luax_newtable(L);
luax_pushvalue(L, -1);
luax_setfield(L, LUA_REGISTRYINDEX, Jin_Lua_Reference_Table);
}
return 1;
}
void luax_getreference(lua_State* L, LuaObject* obj)
{
luax_getreferencestable(L);
luax_pushlightuserdata(L, obj->shared);
luax_gettable(L, -2);
luax_remove(L, -2);
}
bool luax_addreference(lua_State* L, LuaObject* obj, LuaObject* dep)
{
luax_getreference(L, obj);
// If no dependencies table, add one.
if (luax_isnil(L, -1))
{
luax_pop(L, 1);
luax_getreferencestable(L);
luax_newtable(L);
luax_pushlightuserdata(L, obj->shared);
luax_pushvalue(L, -2);
luax_settable(L, -4);
luax_remove(L, -2); // Remove references table.
}
luax_pushlightuserdata(L, dep->shared);
luax_getobject(L, dep);
if (luax_isnil(L, -1))
{
luax_pop(L, 3); // Pop nil, dep, reftbl.
return false;
}
luax_settable(L, -3);
luax_pop(L, 1);
return true;
}
void luax_removereference(lua_State* L, LuaObject* obj)
{
luax_getreferencestable(L);
luax_pushlightuserdata(L, obj->shared);
luax_pushnil(L);
luax_settable(L, -3);
luax_pop(L, 1);
}
void luax_removereference(lua_State* L, LuaObject* obj, LuaObject* dep)
{
luax_getreference(L, obj);
if (luax_isnil(L, -1))
{
luax_pop(L, 1);
return;
}
luax_pushlightuserdata(L, dep->shared);
luax_pushnil(L);
luax_settable(L, -3);
luax_pop(L, 1);
}
}
}
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