minetest/src/script/lua_api/l_item.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_item.h"
#include "lua_api/l_internal.h"
#include "common/c_converter.h"
#include "common/c_content.h"
#include "itemdef.h"
#include "nodedef.h"
#include "server.h"
#include "content_sao.h"
#include "inventory.h"
#include "log.h"
// garbage collector
int LuaItemStack::gc_object(lua_State *L)
{
LuaItemStack *o = *(LuaItemStack **)(lua_touserdata(L, 1));
delete o;
return 0;
}
// is_empty(self) -> true/false
int LuaItemStack::l_is_empty(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
lua_pushboolean(L, item.empty());
return 1;
}
// get_name(self) -> string
int LuaItemStack::l_get_name(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
lua_pushstring(L, item.name.c_str());
return 1;
}
// set_name(self, name)
int LuaItemStack::l_set_name(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
bool status = true;
item.name = luaL_checkstring(L, 2);
if (item.name == "" || item.empty()) {
item.clear();
status = false;
}
lua_pushboolean(L, status);
return 1;
}
// get_count(self) -> number
int LuaItemStack::l_get_count(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
lua_pushinteger(L, item.count);
return 1;
}
// set_count(self, number)
int LuaItemStack::l_set_count(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
bool status;
lua_Integer count = luaL_checkinteger(L, 2);
if (count > 0 && count <= 65535) {
item.count = count;
status = true;
} else {
item.clear();
status = false;
}
lua_pushboolean(L, status);
return 1;
}
// get_wear(self) -> number
int LuaItemStack::l_get_wear(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
lua_pushinteger(L, item.wear);
return 1;
}
// set_wear(self, number)
int LuaItemStack::l_set_wear(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
bool status;
lua_Integer wear = luaL_checkinteger(L, 2);
if (wear <= 65535) {
item.wear = wear;
status = true;
} else {
item.clear();
status = false;
}
lua_pushboolean(L, status);
return 1;
}
// get_metadata(self) -> string
int LuaItemStack::l_get_metadata(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
return 1;
}
// set_metadata(self, string)
int LuaItemStack::l_set_metadata(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
size_t len = 0;
const char *ptr = luaL_checklstring(L, 2, &len);
item.metadata.assign(ptr, len);
lua_pushboolean(L, true);
return 1;
}
// clear(self) -> true
int LuaItemStack::l_clear(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
o->m_stack.clear();
lua_pushboolean(L, true);
return 1;
}
// replace(self, itemstack or itemstring or table or nil) -> true
int LuaItemStack::l_replace(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
o->m_stack = read_item(L,2,getServer(L));
lua_pushboolean(L, true);
return 1;
}
// to_string(self) -> string
int LuaItemStack::l_to_string(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
std::string itemstring = o->m_stack.getItemString();
lua_pushstring(L, itemstring.c_str());
return 1;
}
// to_table(self) -> table or nil
int LuaItemStack::l_to_table(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
const ItemStack &item = o->m_stack;
if(item.empty())
{
lua_pushnil(L);
}
else
{
lua_newtable(L);
lua_pushstring(L, item.name.c_str());
lua_setfield(L, -2, "name");
lua_pushinteger(L, item.count);
lua_setfield(L, -2, "count");
lua_pushinteger(L, item.wear);
lua_setfield(L, -2, "wear");
lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
lua_setfield(L, -2, "metadata");
}
return 1;
}
// get_stack_max(self) -> number
int LuaItemStack::l_get_stack_max(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
lua_pushinteger(L, item.getStackMax(getServer(L)->idef()));
return 1;
}
// get_free_space(self) -> number
int LuaItemStack::l_get_free_space(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
lua_pushinteger(L, item.freeSpace(getServer(L)->idef()));
return 1;
}
// is_known(self) -> true/false
// Checks if the item is defined.
int LuaItemStack::l_is_known(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
bool is_known = item.isKnown(getServer(L)->idef());
lua_pushboolean(L, is_known);
return 1;
}
// get_definition(self) -> table
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// Returns the item definition table from registered_items,
// or a fallback one (name="unknown")
int LuaItemStack::l_get_definition(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
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// Get registered_items[name]
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_items");
luaL_checktype(L, -1, LUA_TTABLE);
lua_getfield(L, -1, item.name.c_str());
if(lua_isnil(L, -1))
{
lua_pop(L, 1);
lua_getfield(L, -1, "unknown");
}
return 1;
}
// get_tool_capabilities(self) -> table
// Returns the effective tool digging properties.
// Returns those of the hand ("") if this item has none associated.
int LuaItemStack::l_get_tool_capabilities(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
const ToolCapabilities &prop =
item.getToolCapabilities(getServer(L)->idef());
push_tool_capabilities(L, prop);
return 1;
}
// add_wear(self, amount) -> true/false
// The range for "amount" is [0,65535]. Wear is only added if the item
// is a tool. Adding wear might destroy the item.
// Returns true if the item is (or was) a tool.
int LuaItemStack::l_add_wear(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
int amount = lua_tointeger(L, 2);
bool result = item.addWear(amount, getServer(L)->idef());
lua_pushboolean(L, result);
return 1;
}
// add_item(self, itemstack or itemstring or table or nil) -> itemstack
// Returns leftover item stack
int LuaItemStack::l_add_item(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
ItemStack newitem = read_item(L,-1, getServer(L));
ItemStack leftover = item.addItem(newitem, getServer(L)->idef());
create(L, leftover);
return 1;
}
// item_fits(self, itemstack or itemstring or table or nil) -> true/false, itemstack
// First return value is true iff the new item fits fully into the stack
// Second return value is the would-be-left-over item stack
int LuaItemStack::l_item_fits(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
ItemStack newitem = read_item(L, 2, getServer(L));
ItemStack restitem;
bool fits = item.itemFits(newitem, &restitem, getServer(L)->idef());
lua_pushboolean(L, fits); // first return value
create(L, restitem); // second return value
return 2;
}
// take_item(self, takecount=1) -> itemstack
int LuaItemStack::l_take_item(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
u32 takecount = 1;
if(!lua_isnone(L, 2))
takecount = luaL_checkinteger(L, 2);
ItemStack taken = item.takeItem(takecount);
create(L, taken);
return 1;
}
// peek_item(self, peekcount=1) -> itemstack
int LuaItemStack::l_peek_item(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = checkobject(L, 1);
ItemStack &item = o->m_stack;
u32 peekcount = 1;
if(!lua_isnone(L, 2))
peekcount = lua_tointeger(L, 2);
ItemStack peekaboo = item.peekItem(peekcount);
create(L, peekaboo);
return 1;
}
LuaItemStack::LuaItemStack(const ItemStack &item):
m_stack(item)
{
}
LuaItemStack::~LuaItemStack()
{
}
const ItemStack& LuaItemStack::getItem() const
{
return m_stack;
}
ItemStack& LuaItemStack::getItem()
{
return m_stack;
}
// LuaItemStack(itemstack or itemstring or table or nil)
// Creates an LuaItemStack and leaves it on top of stack
int LuaItemStack::create_object(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
ItemStack item = read_item(L, 1, getServer(L));
LuaItemStack *o = new LuaItemStack(item);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
return 1;
}
// Not callable from Lua
int LuaItemStack::create(lua_State *L, const ItemStack &item)
{
NO_MAP_LOCK_REQUIRED;
LuaItemStack *o = new LuaItemStack(item);
*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
luaL_getmetatable(L, className);
lua_setmetatable(L, -2);
return 1;
}
LuaItemStack* LuaItemStack::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 *(LuaItemStack**)ud; // unbox pointer
}
void LuaItemStack::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
// Can be created from Lua (LuaItemStack(itemstack or itemstring or table or nil))
lua_register(L, className, create_object);
}
const char LuaItemStack::className[] = "ItemStack";
const luaL_reg LuaItemStack::methods[] = {
luamethod(LuaItemStack, is_empty),
luamethod(LuaItemStack, get_name),
luamethod(LuaItemStack, set_name),
luamethod(LuaItemStack, get_count),
luamethod(LuaItemStack, set_count),
luamethod(LuaItemStack, get_wear),
luamethod(LuaItemStack, set_wear),
luamethod(LuaItemStack, get_metadata),
luamethod(LuaItemStack, set_metadata),
luamethod(LuaItemStack, clear),
luamethod(LuaItemStack, replace),
luamethod(LuaItemStack, to_string),
luamethod(LuaItemStack, to_table),
luamethod(LuaItemStack, get_stack_max),
luamethod(LuaItemStack, get_free_space),
luamethod(LuaItemStack, is_known),
luamethod(LuaItemStack, get_definition),
luamethod(LuaItemStack, get_tool_capabilities),
luamethod(LuaItemStack, add_wear),
luamethod(LuaItemStack, add_item),
luamethod(LuaItemStack, item_fits),
luamethod(LuaItemStack, take_item),
luamethod(LuaItemStack, peek_item),
{0,0}
};
/*
ItemDefinition
*/
// register_item_raw({lots of stuff})
int ModApiItemMod::l_register_item_raw(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
luaL_checktype(L, 1, LUA_TTABLE);
int table = 1;
// Get the writable item and node definition managers from the server
IWritableItemDefManager *idef =
getServer(L)->getWritableItemDefManager();
IWritableNodeDefManager *ndef =
getServer(L)->getWritableNodeDefManager();
// Check if name is defined
std::string name;
lua_getfield(L, table, "name");
if(lua_isstring(L, -1)){
name = lua_tostring(L, -1);
verbosestream<<"register_item_raw: "<<name<<std::endl;
} else {
throw LuaError("register_item_raw: name is not defined or not a string");
}
// Check if on_use is defined
ItemDefinition def;
// Set a distinctive default value to check if this is set
def.node_placement_prediction = "__default";
// Read the item definition
def = read_item_definition(L, table, def);
// Default to having client-side placement prediction for nodes
// ("" in item definition sets it off)
if(def.node_placement_prediction == "__default"){
if(def.type == ITEM_NODE)
def.node_placement_prediction = name;
else
def.node_placement_prediction = "";
}
// Register item definition
idef->registerItem(def);
// Read the node definition (content features) and register it
if(def.type == ITEM_NODE){
ContentFeatures f = read_content_features(L, table);
content_t id = ndef->set(f.name, f);
if(id > MAX_REGISTERED_CONTENT){
throw LuaError("Number of registerable nodes ("
+ itos(MAX_REGISTERED_CONTENT+1)
+ ") exceeded (" + name + ")");
}
}
return 0; /* number of results */
}
// register_alias_raw(name, convert_to_name)
int ModApiItemMod::l_register_alias_raw(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
std::string name = luaL_checkstring(L, 1);
std::string convert_to = luaL_checkstring(L, 2);
// Get the writable item definition manager from the server
IWritableItemDefManager *idef =
getServer(L)->getWritableItemDefManager();
idef->registerAlias(name, convert_to);
return 0; /* number of results */
}
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// get_content_id(name)
int ModApiItemMod::l_get_content_id(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
std::string name = luaL_checkstring(L, 1);
INodeDefManager *ndef = getServer(L)->getNodeDefManager();
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content_t c = ndef->getId(name);
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lua_pushinteger(L, c);
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return 1; /* number of results */
}
// get_name_from_content_id(name)
int ModApiItemMod::l_get_name_from_content_id(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
content_t c = luaL_checkint(L, 1);
INodeDefManager *ndef = getServer(L)->getNodeDefManager();
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const char *name = ndef->get(c).name.c_str();
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lua_pushstring(L, name);
return 1; /* number of results */
}
void ModApiItemMod::Initialize(lua_State *L, int top)
{
API_FCT(register_item_raw);
API_FCT(register_alias_raw);
API_FCT(get_content_id);
API_FCT(get_name_from_content_id);
}