minetest/src/script/lua_api/l_nodemeta.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_nodemeta.h"
#include "lua_api/l_internal.h"
#include "lua_api/l_inventory.h"
#include "common/c_content.h"
#include "serverenvironment.h"
#include "map.h"
#include "server.h"
/*
NodeMetaRef
*/
NodeMetaRef* NodeMetaRef::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 *(NodeMetaRef**)ud; // unbox pointer
}
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Metadata* NodeMetaRef::getmeta(bool auto_create)
{
if (m_is_local)
return m_meta;
NodeMetadata *meta = m_env->getMap().getNodeMetadata(m_p);
if (meta == NULL && auto_create) {
meta = new NodeMetadata(m_env->getGameDef()->idef());
if (!m_env->getMap().setNodeMetadata(m_p, meta)) {
delete meta;
return NULL;
}
}
return meta;
}
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void NodeMetaRef::clearMeta()
{
m_env->getMap().removeNodeMetadata(m_p);
}
void NodeMetaRef::reportMetadataChange()
{
// NOTE: This same code is in rollback_interface.cpp
// Inform other things that the metadata has changed
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v3s16 blockpos = getNodeBlockPos(m_p);
MapEditEvent event;
event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
event.p = blockpos;
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m_env->getMap().dispatchEvent(&event);
// Set the block to be saved
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MapBlock *block = m_env->getMap().getBlockNoCreateNoEx(blockpos);
if (block) {
block->raiseModified(MOD_STATE_WRITE_NEEDED,
MOD_REASON_REPORT_META_CHANGE);
}
}
// Exported functions
// garbage collector
int NodeMetaRef::gc_object(lua_State *L) {
NodeMetaRef *o = *(NodeMetaRef **)(lua_touserdata(L, 1));
delete o;
return 0;
}
// get_inventory(self)
int NodeMetaRef::l_get_inventory(lua_State *L)
{
MAP_LOCK_REQUIRED;
NodeMetaRef *ref = checkobject(L, 1);
ref->getmeta(true); // try to ensure the metadata exists
InvRef::createNodeMeta(L, ref->m_p);
return 1;
}
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void NodeMetaRef::handleToTable(lua_State *L, Metadata *_meta)
{
// fields
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MetaDataRef::handleToTable(L, _meta);
NodeMetadata *meta = (NodeMetadata*) _meta;
// inventory
lua_newtable(L);
Inventory *inv = meta->getInventory();
if (inv) {
std::vector<const InventoryList *> lists = inv->getLists();
for(std::vector<const InventoryList *>::const_iterator
i = lists.begin(); i != lists.end(); i++) {
push_inventory_list(L, inv, (*i)->getName().c_str());
lua_setfield(L, -2, (*i)->getName().c_str());
}
}
lua_setfield(L, -2, "inventory");
}
// from_table(self, table)
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bool NodeMetaRef::handleFromTable(lua_State *L, int table, Metadata *_meta)
{
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// fields
if (!MetaDataRef::handleFromTable(L, table, _meta))
return false;
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NodeMetadata *meta = (NodeMetadata*) _meta;
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// inventory
Inventory *inv = meta->getInventory();
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lua_getfield(L, table, "inventory");
if (lua_istable(L, -1)) {
int inventorytable = lua_gettop(L);
lua_pushnil(L);
while (lua_next(L, inventorytable) != 0) {
// key at index -2 and value at index -1
std::string name = lua_tostring(L, -2);
read_inventory_list(L, -1, inv, name.c_str(), getServer(L));
lua_pop(L, 1); // Remove value, keep key for next iteration
}
lua_pop(L, 1);
}
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return true;
}
NodeMetaRef::NodeMetaRef(v3s16 p, ServerEnvironment *env):
m_p(p),
m_env(env),
m_is_local(false)
{
}
NodeMetaRef::NodeMetaRef(Metadata *meta):
m_meta(meta),
m_is_local(true)
{
}
NodeMetaRef::~NodeMetaRef()
{
}
// Creates an NodeMetaRef and leaves it on top of stack
// Not callable from Lua; all references are created on the C side.
void NodeMetaRef::create(lua_State *L, v3s16 p, ServerEnvironment *env)
{
NodeMetaRef *o = new NodeMetaRef(p, env);
//infostream<<"NodeMetaRef::create: o="<<o<<std::endl;
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
}
// Client-sided version of the above
void NodeMetaRef::createClient(lua_State *L, Metadata *meta)
{
NodeMetaRef *o = new NodeMetaRef(meta);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
}
const char NodeMetaRef::className[] = "NodeMetaRef";
void NodeMetaRef::RegisterCommon(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()
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lua_pushliteral(L, "metadata_class");
lua_pushlstring(L, className, strlen(className));
lua_settable(L, metatable);
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_pushliteral(L, "__eq");
lua_pushcfunction(L, l_equals);
lua_settable(L, metatable);
lua_pop(L, 1); // drop metatable
}
void NodeMetaRef::Register(lua_State *L)
{
RegisterCommon(L);
luaL_openlib(L, 0, methodsServer, 0); // fill methodtable
lua_pop(L, 1); // drop methodtable
}
const luaL_Reg NodeMetaRef::methodsServer[] = {
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luamethod(MetaDataRef, get_string),
luamethod(MetaDataRef, set_string),
luamethod(MetaDataRef, get_int),
luamethod(MetaDataRef, set_int),
luamethod(MetaDataRef, get_float),
luamethod(MetaDataRef, set_float),
luamethod(MetaDataRef, to_table),
luamethod(MetaDataRef, from_table),
luamethod(NodeMetaRef, get_inventory),
luamethod(MetaDataRef, equals),
{0,0}
};
void NodeMetaRef::RegisterClient(lua_State *L)
{
RegisterCommon(L);
luaL_openlib(L, 0, methodsClient, 0); // fill methodtable
lua_pop(L, 1); // drop methodtable
}
const luaL_Reg NodeMetaRef::methodsClient[] = {
luamethod(MetaDataRef, get_string),
luamethod(MetaDataRef, get_int),
luamethod(MetaDataRef, get_float),
luamethod(MetaDataRef, to_table),
{0,0}
};