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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "LuaSyncedTable.h"
#include "LuaInclude.h"
#include "LuaHandleSynced.h"
#include "LuaHashString.h"
#include "LuaUtils.h"
static int SyncTableIndex(lua_State* L);
static int SyncTableNewIndex(lua_State* L);
static int SyncTableMetatable(lua_State* L);
/******************************************************************************/
/******************************************************************************/
static bool PushSyncedTable(lua_State* L)
{
HSTR_PUSH(L, "SYNCED");
lua_newtable(L); { // the proxy table
lua_newtable(L); { // the metatable
LuaPushNamedCFunc(L, "__index", SyncTableIndex);
LuaPushNamedCFunc(L, "__newindex", SyncTableNewIndex);
LuaPushNamedCFunc(L, "__metatable", SyncTableMetatable);
}
lua_setmetatable(L, -2);
}
lua_rawset(L, -3);
return true;
}
/******************************************************************************/
static int SyncTableIndex(lua_State* dstL)
{
if (lua_isnoneornil(dstL, -1))
return 0;
auto slh = CLuaHandleSynced::GetSyncedHandle(dstL);
if (!slh->IsValid())
return 0;
auto srcL = slh->GetLuaState();
const int srcTop = lua_gettop(srcL);
const int dstTop = lua_gettop(dstL);
// copy the index & get value
lua_pushvalue(srcL, LUA_GLOBALSINDEX);
const int keyCopied = LuaUtils::CopyData(srcL, dstL, 1);
assert(keyCopied > 0);
lua_rawget(srcL, -2);
// copy to destination
const int valueCopied = LuaUtils::CopyData(dstL, srcL, 1);
if (lua_istable(dstL, -1)) {
// disallow writing in SYNCED[...]
lua_newtable(dstL); { // the metatable
LuaPushNamedCFunc(dstL, "__newindex", SyncTableNewIndex);
LuaPushNamedCFunc(dstL, "__metatable", SyncTableMetatable);
}
lua_setmetatable(dstL, -2);
}
assert(valueCopied == 1);
assert(dstTop + 1 == lua_gettop(dstL));
lua_settop(srcL, srcTop);
return valueCopied;
}
static int SyncTableNewIndex(lua_State* L)
{
luaL_error(L, "Attempt to write to SYNCED table");
return 0;
}
static int SyncTableMetatable(lua_State* L)
{
luaL_error(L, "Attempt to access SYNCED metatable");
return 0;
}
/******************************************************************************/
/******************************************************************************/
bool LuaSyncedTable::PushEntries(lua_State* L)
{
PushSyncedTable(L);
// backward compability
lua_pushliteral(L, "snext");
lua_getglobal(L, "next");
lua_rawset(L, -3);
lua_pushliteral(L, "spairs");
lua_getglobal(L, "pairs");
lua_rawset(L, -3);
lua_pushliteral(L, "sipairs");
lua_getglobal(L, "ipairs");
lua_rawset(L, -3);
return true;
}
/******************************************************************************/
/******************************************************************************/
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