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Diffstat (limited to 'src/script/cpp_api/s_item.cpp')
| -rw-r--r-- | src/script/cpp_api/s_item.cpp | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/script/cpp_api/s_item.cpp b/src/script/cpp_api/s_item.cpp new file mode 100644 index 000000000..6937ebbeb --- /dev/null +++ b/src/script/cpp_api/s_item.cpp @@ -0,0 +1,164 @@ +/* +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"); + } +} + + |