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#include "libjin/jin.h"
#include "je_lua.h"
using namespace JinEngine::Math;
namespace JinEngine
{
namespace Lua
{
///
/// Lua objects table. Map object to proxy, like objects_table[object] = proxy.
///
static const char* Jin_Lua_Objects_Table = "Jin_Objects_Table";
///
/// Lua modules table. Map object to proxy, like modules_table[object] = module.
///
static const char* Jin_Lua_Modules_Table = "Jin_Modules_Table";
///
/// Lua references table. Map object to proxy, like references[object] = ref.
///
static const char* Jin_Lua_Reference_Table = "Jin_Reference_Table";
Proxy* luax_newinstance(lua_State* L, const char* type, SharedBase* shared)
{
Proxy* proxy = static_cast<Proxy*>(luax_newinstance(L, type, sizeof(Proxy)));
if (shared) proxy->bind(shared);
luax_getobjectstable(L);
// Add to objects_table, like objects_table[shared] = proxy
luax_pushlightuserdata(L, shared);
luax_pushvalue(L, -3);
luax_settable(L, -3);
luax_pop(L, 1); // Pop objects table.
return proxy;
}
int luax_getobject(lua_State* L, SharedBase* shared)
{
luax_getobjectstable(L);
luax_pushlightuserdata(L, shared);
luax_gettable(L, -2);
luax_remove(L, -2); // Remove objects table on stack.
return 1;
}
void luax_removeobject(lua_State* L, SharedBase* shared)
{
luax_getobjectstable(L);
luax_pushlightuserdata(L, 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, SharedBase* shared)
{
luax_getreferencestable(L);
luax_pushlightuserdata(L, shared);
luax_gettable(L, -2);
luax_remove(L, -2);
}
bool luax_addreference(lua_State* L, SharedBase* shared, SharedBase* dep)
{
luax_getreference(L, shared);
// If no dependencies table, add one.
if (luax_isnil(L, -1))
{
luax_pop(L, 1);
luax_getreferencestable(L);
luax_newtable(L);
luax_pushlightuserdata(L, shared);
luax_pushvalue(L, -2);
luax_settable(L, -4);
luax_remove(L, -2); // Remove references table.
}
luax_pushlightuserdata(L, dep);
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, SharedBase* shared)
{
luax_getreferencestable(L);
luax_pushlightuserdata(L, shared);
luax_pushnil(L);
luax_settable(L, -3);
luax_pop(L, 1);
}
void luax_removereference(lua_State* L, SharedBase* shared, SharedBase* dep)
{
luax_getreference(L, shared);
if (luax_isnil(L, -1))
{
luax_pop(L, 1);
return;
}
luax_pushlightuserdata(L, dep);
luax_pushnil(L);
luax_settable(L, -3);
luax_pop(L, 1);
}
}
}
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