src/script/lua_api/l_env.cpp


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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

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 "lua_api/l_env.h"
#include "lua_api/l_internal.h"
#include "lua_api/l_nodemeta.h"
#include "lua_api/l_nodetimer.h"
#include "lua_api/l_noise.h"
#include "lua_api/l_vmanip.h"
#include "common/c_converter.h"
#include "common/c_content.h"
#include <algorithm>
#include "scripting_server.h"
#include "environment.h"
#include "mapblock.h"
#include "server.h"
#include "nodedef.h"
#include "daynightratio.h"
#include "util/pointedthing.h"
#include "content_sao.h"
#include "mapgen/treegen.h"
#include "emerge.h"
#include "pathfinder.h"
#include "face_position_cache.h"
#include "remoteplayer.h"
#ifndef SERVER
#include "client/client.h"
#endif

struct EnumString ModApiEnvMod::es_ClearObjectsMode[] =
{
	{CLEAR_OBJECTS_MODE_FULL,  "full"},
	{CLEAR_OBJECTS_MODE_QUICK, "quick"},
	{0, NULL},
};

///////////////////////////////////////////////////////////////////////////////


void LuaABM::trigger(ServerEnvironment *env, v3s16 p, MapNode n,
		u32 active_object_count, u32 active_object_count_wider)
{
	ServerScripting *scriptIface = env->getScriptIface();
	scriptIface->realityCheck();

	lua_State *L = scriptIface->getStack();
	sanity_check(lua_checkstack(L, 20));
	StackUnroller stack_unroller(L);

	int error_handler = PUSH_ERROR_HANDLER(L);

	// Get registered_abms
	lua_getglobal(L, "core");
	lua_getfield(L, -1, "registered_abms");
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_remove(L, -2); // Remove core

	// Get registered_abms[m_id]
	lua_pushnumber(L, m_id);
	lua_gettable(L, -2);
	if(lua_isnil(L, -1))
		FATAL_ERROR("");
	lua_remove(L, -2); // Remove registered_abms

	scriptIface->setOriginFromTable(-1);

	// Call action
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_getfield(L, -1, "action");
	luaL_checktype(L, -1, LUA_TFUNCTION);
	lua_remove(L, -2); // Remove registered_abms[m_id]
	push_v3s16(L, p);
	pushnode(L, n, env->getGameDef()->ndef());
	lua_pushnumber(L, active_object_count);
	lua_pushnumber(L, active_object_count_wider);

	int result = lua_pcall(L, 4, 0, error_handler);
	if (result)
		scriptIface->scriptError(result, "LuaABM::trigger");

	lua_pop(L, 1); // Pop error handler
}

void LuaLBM::trigger(ServerEnvironment *env, v3s16 p, MapNode n)
{
	ServerScripting *scriptIface = env->getScriptIface();
	scriptIface->realityCheck();

	lua_State *L = scriptIface->getStack();
	sanity_check(lua_checkstack(L, 20));
	StackUnroller stack_unroller(L);

	int error_handler = PUSH_ERROR_HANDLER(L);

	// Get registered_lbms
	lua_getglobal(L, "core");
	lua_getfield(L, -1, "registered_lbms");
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_remove(L, -2); // Remove core

	// Get registered_lbms[m_id]
	lua_pushnumber(L, m_id);
	lua_gettable(L, -2);
	FATAL_ERROR_IF(lua_isnil(L, -1), "Entry with given id not found in registered_lbms table");
	lua_remove(L, -2); // Remove registered_lbms

	scriptIface->setOriginFromTable(-1);

	// Call action
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_getfield(L, -1, "action");
	luaL_checktype(L, -1, LUA_TFUNCTION);
	lua_remove(L, -2); // Remove registered_lbms[m_id]
	push_v3s16(L, p);
	pushnode(L, n, env->getGameDef()->ndef());

	int result = lua_pcall(L, 2, 0, error_handler);
	if (result)
		scriptIface->scriptError(result, "LuaLBM::trigger");

	lua_pop(L, 1); // Pop error handler
}

int LuaRaycast::l_next(lua_State *L)
{
	MAP_LOCK_REQUIRED;

	ScriptApiItem *script = getScriptApi<ScriptApiItem>(L);
	GET_ENV_PTR;

	LuaRaycast *o = checkobject(L, 1);
	PointedThing pointed;
	env->continueRaycast(&o->state, &pointed);
	if (pointed.type == POINTEDTHING_NOTHING)
		lua_pushnil(L);
	else
		script->pushPointedThing(pointed, true);

	return 1;
}

int LuaRaycast::create_object(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;

	bool objects = true;
	bool liquids = false;

	v3f pos1 = checkFloatPos(L, 1);
	v3f pos2 = checkFloatPos(L, 2);
	if (lua_isboolean(L, 3)) {
		objects = readParam<bool>(L, 3);
	}
	if (lua_isboolean(L, 4)) {
		liquids = readParam<bool>(L, 4);
	}

	LuaRaycast *o = new LuaRaycast(core::line3d<f32>(pos1, pos2),
		objects, liquids);

	*(void **) (lua_newuserdata(L, sizeof(void *))) = o;
	luaL_getmetatable(L, className);
	lua_setmetatable(L, -2);
	return 1;
}

LuaRaycast *LuaRaycast::checkobject(lua_State *L, int narg)
{
	NO_MAP_LOCK_REQUIRED;

	luaL_checktype(L, narg, LUA_TUSERDATA);
	void *ud = luaL_checkudata(L, narg, className);
	if (!ud)
		luaL_typerror(L, narg, className);
	return *(LuaRaycast **) ud;
}

int LuaRaycast::gc_object(lua_State *L)
{
	LuaRaycast *o = *(LuaRaycast **) (lua_touserdata(L, 1));
	delete o;
	return 0;
}

void LuaRaycast::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);

	lua_pushliteral(L, "__index");
	lua_pushvalue(L, methodtable);
	lua_settable(L, metatable);