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/*
Minetest
Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <cassert>
#include <log.h>
#include "lua_api/l_modchannels.h"
#include "l_internal.h"
#include "modchannels.h"
int ModApiChannels::l_mod_channel_join(lua_State *L)
{
if (!lua_isstring(L, 1))
return 0;
std::string channel = luaL_checkstring(L, 1);
if (channel.empty())
return 0;
getGameDef(L)->joinModChannel(channel);
ModChannel *channelObj = getGameDef(L)->getModChannel(channel);
assert(channelObj);
ModChannelRef::create(L, channelObj);
int object = lua_gettop(L);
lua_pushvalue(L, object);
return 1;
}
void ModApiChannels::Initialize(lua_State *L, int top)
{
API_FCT(mod_channel_join);
}
/*
* ModChannelRef
*/
ModChannelRef::ModChannelRef(ModChannel *modchannel) : m_modchannel(modchannel)
{
}
int ModChannelRef::l_leave(lua_State *L)
{
ModChannelRef *ref = checkobject(L, 1);
ModChannel *channel = getobject(ref);
if (!channel)
return 0;
getGameDef(L)->leaveModChannel(channel->getName());
// Channel left, invalidate the channel object ptr
// This permits to invalidate every object action from Lua because core removed
// channel consuming link
ref->m_modchannel = nullptr;
return 0;
}
int ModChannelRef::l_send_all(lua_State *L)
{
ModChannelRef *ref = checkobject(L, 1);
ModChannel *channel = getobject(ref);
if (!channel || !channel->canWrite())
return 0;
// @TODO serialize message
std::string message = luaL_checkstring(L, 2);
getGameDef(L)->sendModChannelMessage(channel->getName(), message);
return 0;
}
int ModChannelRef::l_is_writeable(lua_State *L)
{
ModChannelRef *ref = checkobject(L, 1);
ModChannel *channel = getobject(ref);
if (!channel)
return 0;
lua_pushboolean(L, channel->canWrite());
return 1;
}
void ModChannelRef::Register(lua_State *L)
{
lua_newtable(L);
int methodtable = lua_gettop(L);
luaL_newmetatable(L, className);
int metatable = lua_gettop(L);
lua_pushliteral(L, "__metatable");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable); // hide metatable from lua getmetatable()
lua_pushliteral(L, "__index");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable);
lua_pushliteral(L, "__gc");
lua_pushcfunction(L, gc_object);
lua_settable(L, metatable);
lua_pop(L, 1); // Drop metatable
luaL_openlib(L, 0, methods, 0); // fill methodtable
lua_pop(L, 1); // Drop methodtable
}
void ModChannelRef::create(lua_State *L, ModChannel *channel)
{
ModChannelRef *o = new ModChannelRef(channel);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
}
int ModChannelRef::gc_object(lua_State *L)
{
ModChannelRef *o = *(ModChannelRef **)(lua_touserdata(L, 1));
delete o;
return 0;
}
ModChannelRef *ModChannelRef::checkobject(lua_State *L, int narg)
{
luaL_checktype(L, narg, LUA_TUSERDATA);
void *ud = luaL_checkudata(L, narg, className);
if (!ud)
luaL_typerror(L, narg, className);
return *(ModChannelRef **)ud; // unbox pointer
}
ModChannel *ModChannelRef::getobject(ModChannelRef *ref)
{
return ref->m_modchannel;
}
// clang-format off
const char ModChannelRef::className[] = "ModChannelRef";
const luaL_Reg ModChannelRef::methods[] = {
luamethod(ModChannelRef, leave),
luamethod(ModChannelRef, is_writeable),
luamethod(ModChannelRef, send_all),
{0, 0},
};
// clang-format on
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