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_converter.h"
#include "common/c_content.h"
#include "environment.h"
#include "map.h"
#include "nodemetadata.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
}
NodeMetadata* NodeMetaRef::getmeta(NodeMetaRef *ref, bool auto_create)
{
NodeMetadata *meta = ref->m_env->getMap().getNodeMetadata(ref->m_p);
if(meta == NULL && auto_create) {
meta = new NodeMetadata(ref->m_env->getGameDef());
if(!ref->m_env->getMap().setNodeMetadata(ref->m_p, meta)) {
delete meta;
return NULL;
}
}
return meta;
}
void NodeMetaRef::reportMetadataChange(NodeMetaRef *ref)
{
// NOTE: This same code is in rollback_interface.cpp
// Inform other things that the metadata has changed
v3s16 blockpos = getNodeBlockPos(ref->m_p);
MapEditEvent event;
event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
event.p = blockpos;
ref->m_env->getMap().dispatchEvent(&event);
// Set the block to be saved
MapBlock *block = ref->m_env->getMap().getBlockNoCreateNoEx(blockpos);
if(block)
block->raiseModified(MOD_STATE_WRITE_NEEDED,
"NodeMetaRef::reportMetadataChange");
}
// Exported functions
// garbage collector
int NodeMetaRef::gc_object(lua_State *L) {
NodeMetaRef *o = *(NodeMetaRef **)(lua_touserdata(L, 1));
delete o;
return 0;
}
// get_string(self, name)
int NodeMetaRef::l_get_string(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
NodeMetadata *meta = getmeta(ref, false);
if(meta == NULL){
lua_pushlstring(L, "", 0);
return 1;
}
std::string str = meta->getString(name);
lua_pushlstring(L, str.c_str(), str.size());
return 1;
}
// set_string(self, name, var)
int NodeMetaRef::l_set_string(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
size_t len = 0;
const char *s = lua_tolstring(L, 3, &len);
std::string str(s, len);
NodeMetadata *meta = getmeta(ref, !str.empty());
if(meta == NULL || str == meta->getString(name))
return 0;
meta->setString(name, str);
reportMetadataChange(ref);
return 0;
}
// get_int(self, name)
int NodeMetaRef::l_get_int(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
std::string name = lua_tostring(L, 2);
NodeMetadata *meta = getmeta(ref, false);
if(meta == NULL){
lua_pushnumber(L, 0);
return 1;
}
std::string str = meta->getString(name);
lua_pushnumber(L, stoi(str));
return 1;
}
// set_int(self, name, var)
int NodeMetaRef::l_set_int(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
std::string name = lua_tostring(L, 2);
int a = lua_tointeger(L, 3);
std::string str = itos(a);
NodeMetadata *meta = getmeta(ref, true);
if(meta == NULL || str == meta->getString(name))
return 0;
meta->setString(name, str);
reportMetadataChange(ref);
return 0;
}
// get_float(self, name)
int NodeMetaRef::l_get_float(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
std::string name = lua_tostring(L, 2);
NodeMetadata *meta = getmeta(ref, false);
if(meta == NULL){
lua_pushnumber(L, 0);
return 1;
}
std::string str = meta->getString(name);
lua_pushnumber(L, stof(str));
return 1;
}
// set_float(self, name, var)
int NodeMetaRef::l_set_float(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
std::string name = lua_tostring(L, 2);
float a = lua_tonumber(L, 3);
std::string str = ftos(a);
NodeMetadata *meta = getmeta(ref, true);
if(meta == NULL || str == meta->getString(name))
return 0;
meta->setString(name, str);
reportMetadataChange(ref);
return 0;
}
// get_inventory(self)
int NodeMetaRef::l_get_inventory(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
getmeta(ref, true); // try to ensure the metadata exists
InvRef::createNodeMeta(L, ref->m_p);
return 1;
}
// to_table(self)
int NodeMetaRef::l_to_table(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
NodeMetadata *meta = getmeta(ref, true);
if(meta == NULL){
lua_pushnil(L);
return 1;
}
lua_newtable(L);
// fields
lua_newtable(L);
{
std::map<std::string, std::string> fields = meta->getStrings();
for(std::map<std::string, std::string>::const_iterator
i = fields.begin(); i != fields.end(); i++){
const std::string &name = i->first;
const std::string &value = i->second;
lua_pushlstring(L, name.c_str(), name.size());
lua_pushlstring(L, value.c_str(), value.size());
lua_settable(L, -3);
}
}
lua_setfield(L, -2, "fields");
// 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");
return 1;
}
// from_table(self, table)
int NodeMetaRef::l_from_table(lua_State *L)
{
NodeMetaRef *ref = checkobject(L, 1);
int base = 2;
// clear old metadata first
ref->m_env->getMap().removeNodeMetadata(ref->m_p);
if(lua_isnil(L, base)){
// No metadata
lua_pushboolean(L, true);
return 1;
}
// Create new metadata
NodeMetadata *meta = getmeta(ref, true);
if(meta == NULL){
lua_pushboolean(L, false);
return 1;
}
// Set fields
lua_getfield(L, base, "fields");
int fieldstable = lua_gettop(L);
lua_pushnil(L);
while(lua_next(L, fieldstable) != 0){
// key at index -2 and value at index -1
std::string name = lua_tostring(L, -2);
size_t cl;
const char *cs = lua_tolstring(L, -1, &cl);
std::string value(cs, cl);
meta->setString(name, value);
lua_pop(L, 1); // removes value, keeps key for next iteration
}
// Set inventory
Inventory *inv = meta->getInventory();
lua_getfield(L, base, "inventory");
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); // removes value, keeps key for next iteration
}
reportMetadataChange(ref);
lua_pushboolean(L, true);
return 1;
}
NodeMetaRef::NodeMetaRef(v3s16 p, ServerEnvironment *env):
m_p(p),
m_env(env)
{
}
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);
}
void NodeMetaRef::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
// Cannot be created from Lua
//lua_register(L, className, create_object);
}
const char NodeMetaRef::className[] = "NodeMetaRef";
const luaL_reg NodeMetaRef::methods[] = {
luamethod(NodeMetaRef, get_string),
luamethod(NodeMetaRef, set_string),
luamethod(NodeMetaRef, get_int),
luamethod(NodeMetaRef, set_int),
luamethod(NodeMetaRef, get_float),
luamethod(NodeMetaRef, set_float),
luamethod(NodeMetaRef, get_inventory),
luamethod(NodeMetaRef, to_table),
luamethod(NodeMetaRef, from_table),
{0,0}
};