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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 "cpp_api/s_item.h"
#include "common/c_converter.h"
#include "common/c_content.h"
#include "lua_api/l_item.h"
#include "server.h"
bool ScriptApiItem::item_OnDrop(ItemStack &item,
ServerActiveObject *dropper, v3f pos)
{
SCRIPTAPI_PRECHECKHEADER
// Push callback function on stack
if(!getItemCallback(item.name.c_str(), "on_drop"))
return false;
// Call function
LuaItemStack::create(L, item);
objectrefGetOrCreate(dropper);
pushFloatPos(L, pos);
if(lua_pcall(L, 3, 1, 0))
scriptError("error: %s", lua_tostring(L, -1));
if(!lua_isnil(L, -1))
item = read_item(L,-1, getServer());
return true;
}
bool ScriptApiItem::item_OnPlace(ItemStack &item,
ServerActiveObject *placer, const PointedThing &pointed)
{
SCRIPTAPI_PRECHECKHEADER
// Push callback function on stack
if(!getItemCallback(item.name.c_str(), "on_place"))
return false;
// Call function
LuaItemStack::create(L, item);
objectrefGetOrCreate(placer);
pushPointedThing(pointed);
if(lua_pcall(L, 3, 1, 0))
scriptError("error: %s", lua_tostring(L, -1));
if(!lua_isnil(L, -1))
item = read_item(L,-1, getServer());
return true;
}
bool ScriptApiItem::item_OnUse(ItemStack &item,
ServerActiveObject *user, const PointedThing &pointed)
{
SCRIPTAPI_PRECHECKHEADER
// Push callback function on stack
if(!getItemCallback(item.name.c_str(), "on_use"))
return false;
// Call function
LuaItemStack::create(L, item);
objectrefGetOrCreate(user);
pushPointedThing(pointed);
if(lua_pcall(L, 3, 1, 0))
scriptError("error: %s", lua_tostring(L, -1));
if(!lua_isnil(L, -1))
item = read_item(L,-1, getServer());
return true;
}
// Retrieves minetest.registered_items[name][callbackname]
// If that is nil or on error, return false and stack is unchanged
// If that is a function, returns true and pushes the
// function onto the stack
// If minetest.registered_items[name] doesn't exist, minetest.nodedef_default
// is tried instead so unknown items can still be manipulated to some degree
bool ScriptApiItem::getItemCallback(const char *name, const char *callbackname)
{
lua_State* L = getStack();
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "registered_items");
lua_remove(L, -2);
luaL_checktype(L, -1, LUA_TTABLE);
lua_getfield(L, -1, name);
lua_remove(L, -2);
// Should be a table
if(lua_type(L, -1) != LUA_TTABLE)
{
// Report error and clean up
errorstream<<"Item \""<<name<<"\" not defined"<<std::endl;
lua_pop(L, 1);
// Try minetest.nodedef_default instead
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "nodedef_default");
lua_remove(L, -2);
luaL_checktype(L, -1, LUA_TTABLE);
}
lua_getfield(L, -1, callbackname);
lua_remove(L, -2);
// Should be a function or nil
if(lua_type(L, -1) == LUA_TFUNCTION)
{
return true;
}
else if(lua_isnil(L, -1))
{
lua_pop(L, 1);
return false;
}
else
{
errorstream<<"Item \""<<name<<"\" callback \""
<<callbackname<<" is not a function"<<std::endl;
lua_pop(L, 1);
return false;
}
}
void ScriptApiItem::pushPointedThing(const PointedThing& pointed)
{
lua_State* L = getStack();
lua_newtable(L);
if(pointed.type == POINTEDTHING_NODE)
{
lua_pushstring(L, "node");
lua_setfield(L, -2, "type");
push_v3s16(L, pointed.node_undersurface);
lua_setfield(L, -2, "under");
push_v3s16(L, pointed.node_abovesurface);
lua_setfield(L, -2, "above");
}
else if(pointed.type == POINTEDTHING_OBJECT)
{
lua_pushstring(L, "object");
lua_setfield(L, -2, "type");
objectrefGet(pointed.object_id);
lua_setfield(L, -2, "ref");
}
else
{
lua_pushstring(L, "nothing");
lua_setfield(L, -2, "type");
}
}
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