src/scriptapi.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "scriptapi.h"
  21
  22 #include <iostream>
  23 #include <list>
  24 extern "C" {
  25 #include <lua.h>
  26 #include <lualib.h>
  27 #include <lauxlib.h>
  28 }
  29
  30 #include "log.h"
  31 #include "server.h"
  32 #include "porting.h"
  33 #include "filesys.h"
  34 #include "serverobject.h"
  35 #include "script.h"
  36 //#include "luna.h"
  37 #include "luaentity_common.h"
  38 #include "content_sao.h" // For LuaEntitySAO
  39 #include "itemdef.h"
  40 #include "nodedef.h"
  41 #include "craftdef.h"
  42 #include "main.h" // For g_settings
  43 #include "settings.h" // For accessing g_settings
  44 #include "nodemetadata.h"
  45 #include "mapblock.h" // For getNodeBlockPos
  46 #include "content_nodemeta.h"
  47 #include "utility.h"
  48
  49 static void stackDump(lua_State *L, std::ostream &o)
  50 {
  51   int i;
  52   int top = lua_gettop(L);
  53   for (i = 1; i <= top; i++) {  /* repeat for each level */
  54         int t = lua_type(L, i);
  55         switch (t) {
  56
  57           case LUA_TSTRING:  /* strings */
  58                 o<<"\""<<lua_tostring(L, i)<<"\"";
  59                 break;
  60
  61           case LUA_TBOOLEAN:  /* booleans */
  62                 o<<(lua_toboolean(L, i) ? "true" : "false");
  63                 break;
  64
  65           case LUA_TNUMBER:  /* numbers */ {
  66                 char buf[10];
  67                 snprintf(buf, 10, "%g", lua_tonumber(L, i));
  68                 o<<buf;
  69                 break; }
  70
  71           default:  /* other values */
  72                 o<<lua_typename(L, t);
  73                 break;
  74
  75         }
  76         o<<" ";
  77   }
  78   o<<std::endl;
  79 }
  80
  81 static void realitycheck(lua_State *L)
  82 {
  83         int top = lua_gettop(L);
  84         if(top >= 30){
  85                 dstream<<"Stack is over 30:"<<std::endl;
  86                 stackDump(L, dstream);
  87                 script_error(L, "Stack is over 30 (reality check)");
  88         }
  89 }
  90
  91 class StackUnroller
  92 {
  93 private:
  94         lua_State *m_lua;
  95         int m_original_top;
  96 public:
  97         StackUnroller(lua_State *L):
  98                 m_lua(L),
  99                 m_original_top(-1)
 100         {
 101                 m_original_top = lua_gettop(m_lua); // store stack height
 102         }
 103         ~StackUnroller()
 104         {
 105                 lua_settop(m_lua, m_original_top); // restore stack height
 106         }
 107 };
 108
 109 class ModNameStorer
 110 {
 111 private:
 112         lua_State *L;
 113 public:
 114         ModNameStorer(lua_State *L_, const std::string modname):
 115                 L(L_)
 116         {
 117                 // Store current modname in registry
 118                 lua_pushstring(L, modname.c_str());
 119                 lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
 120         }
 121         ~ModNameStorer()
 122         {
 123                 // Clear current modname in registry
 124                 lua_pushnil(L);
 125                 lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
 126         }
 127 };
 128
 129 /*
 130         Getters for stuff in main tables
 131 */
 132
 133 static Server* get_server(lua_State *L)
 134 {
 135         // Get server from registry
 136         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_server");
 137         Server *server = (Server*)lua_touserdata(L, -1);
 138         lua_pop(L, 1);
 139         return server;
 140 }
 141
 142 static ServerEnvironment* get_env(lua_State *L)
 143 {
 144         // Get environment from registry
 145         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_env");
 146         ServerEnvironment *env = (ServerEnvironment*)lua_touserdata(L, -1);
 147         lua_pop(L, 1);
 148         return env;
 149 }
 150
 151 static void objectref_get(lua_State *L, u16 id)
 152 {
 153         // Get minetest.object_refs[i]
 154         lua_getglobal(L, "minetest");
 155         lua_getfield(L, -1, "object_refs");
 156         luaL_checktype(L, -1, LUA_TTABLE);
 157         lua_pushnumber(L, id);
 158         lua_gettable(L, -2);
 159         lua_remove(L, -2); // object_refs
 160         lua_remove(L, -2); // minetest
 161 }
 162
 163 static void luaentity_get(lua_State *L, u16 id)
 164 {
 165         // Get minetest.luaentities[i]
 166         lua_getglobal(L, "minetest");
 167         lua_getfield(L, -1, "luaentities");
 168         luaL_checktype(L, -1, LUA_TTABLE);
 169         lua_pushnumber(L, id);
 170         lua_gettable(L, -2);
 171         lua_remove(L, -2); // luaentities
 172         lua_remove(L, -2); // minetest
 173 }
 174
 175 /*
 176         Table field getters
 177 */
 178
 179 static bool getstringfield(lua_State *L, int table,
 180                 const char *fieldname, std::string &result)
 181 {
 182         lua_getfield(L, table, fieldname);
 183         bool got = false;
 184         if(lua_isstring(L, -1)){
 185                 size_t len = 0;
 186                 const char *ptr = lua_tolstring(L, -1, &len);
 187                 result.assign(ptr, len);
 188                 got = true;
 189         }
 190         lua_pop(L, 1);
 191         return got;
 192 }
 193
 194 static bool getintfield(lua_State *L, int table,
 195                 const char *fieldname, int &result)
 196 {
 197         lua_getfield(L, table, fieldname);
 198         bool got = false;
 199         if(lua_isnumber(L, -1)){
 200                 result = lua_tonumber(L, -1);
 201                 got = true;
 202         }
 203         lua_pop(L, 1);
 204         return got;
 205 }
 206
 207 static bool getfloatfield(lua_State *L, int table,
 208                 const char *fieldname, float &result)
 209 {
 210         lua_getfield(L, table, fieldname);
 211         bool got = false;
 212         if(lua_isnumber(L, -1)){
 213                 result = lua_tonumber(L, -1);
 214                 got = true;
 215         }
 216         lua_pop(L, 1);
 217         return got;
 218 }
 219
 220 static bool getboolfield(lua_State *L, int table,
 221                 const char *fieldname, bool &result)
 222 {
 223         lua_getfield(L, table, fieldname);
 224         bool got = false;
 225         if(lua_isboolean(L, -1)){
 226                 result = lua_toboolean(L, -1);
 227                 got = true;
 228         }
 229         lua_pop(L, 1);
 230         return got;
 231 }
 232
 233 static std::string checkstringfield(lua_State *L, int table,
 234                 const char *fieldname)
 235 {
 236         lua_getfield(L, table, fieldname);
 237         std::string s = luaL_checkstring(L, -1);
 238         lua_pop(L, 1);
 239         return s;
 240 }
 241
 242 static std::string getstringfield_default(lua_State *L, int table,
 243                 const char *fieldname, const std::string &default_)
 244 {
 245         std::string result = default_;
 246         getstringfield(L, table, fieldname, result);
 247         return result;
 248 }
 249
 250 static int getintfield_default(lua_State *L, int table,
 251                 const char *fieldname, int default_)
 252 {
 253         int result = default_;
 254         getintfield(L, table, fieldname, result);
 255         return result;
 256 }
 257
 258 static float getfloatfield_default(lua_State *L, int table,
 259                 const char *fieldname, float default_)
 260 {
 261         float result = default_;
 262         getfloatfield(L, table, fieldname, result);
 263         return result;
 264 }
 265
 266 static bool getboolfield_default(lua_State *L, int table,
 267                 const char *fieldname, bool default_)
 268 {
 269         bool result = default_;
 270         getboolfield(L, table, fieldname, result);
 271         return result;
 272 }
 273
 274 struct EnumString
 275 {
 276         int num;
 277         const char *str;
 278 };
 279
 280 static bool string_to_enum(const EnumString *spec, int &result,
 281                 const std::string &str)
 282 {
 283         const EnumString *esp = spec;
 284         while(esp->str){
 285                 if(str == std::string(esp->str)){
 286                         result = esp->num;
 287                         return true;
 288                 }
 289                 esp++;
 290         }
 291         return false;
 292 }
 293
 294 /*static bool enum_to_string(const EnumString *spec, std::string &result,
 295                 int num)
 296 {
 297         const EnumString *esp = spec;
 298         while(esp){
 299                 if(num == esp->num){
 300                         result = esp->str;
 301                         return true;
 302                 }
 303                 esp++;
 304         }
 305         return false;
 306 }*/
 307
 308 static int getenumfield(lua_State *L, int table,
 309                 const char *fieldname, const EnumString *spec, int default_)
 310 {
 311         int result = default_;
 312         string_to_enum(spec, result,
 313                         getstringfield_default(L, table, fieldname, ""));
 314         return result;
 315 }
 316
 317 static void setintfield(lua_State *L, int table,
 318                 const char *fieldname, int value)
 319 {
 320         lua_pushinteger(L, value);
 321         if(table < 0)
 322                 table -= 1;
 323         lua_setfield(L, table, fieldname);
 324 }
 325
 326 static void setfloatfield(lua_State *L, int table,
 327                 const char *fieldname, float value)
 328 {
 329         lua_pushnumber(L, value);
 330         if(table < 0)
 331                 table -= 1;
 332         lua_setfield(L, table, fieldname);
 333 }
 334
 335 static void setboolfield(lua_State *L, int table,
 336                 const char *fieldname, bool value)
 337 {
 338         lua_pushboolean(L, value);
 339         if(table < 0)
 340                 table -= 1;
 341         lua_setfield(L, table, fieldname);
 342 }
 343
 344 static void warn_if_field_exists(lua_State *L, int table,
 345                 const char *fieldname, const std::string &message)
 346 {
 347         lua_getfield(L, table, fieldname);
 348         if(!lua_isnil(L, -1)){
 349                 infostream<<script_get_backtrace(L)<<std::endl;
 350                 infostream<<"WARNING: field \""<<fieldname<<"\": "
 351                                 <<message<<std::endl;
 352         }
 353         lua_pop(L, 1);
 354 }
 355
 356 /*
 357         EnumString definitions
 358 */
 359
 360 struct EnumString es_ItemType[] =
 361 {
 362         {ITEM_NONE, "none"},
 363         {ITEM_NODE, "node"},
 364         {ITEM_CRAFT, "craft"},
 365         {ITEM_TOOL, "tool"},
 366         {0, NULL},
 367 };
 368
 369 struct EnumString es_DrawType[] =
 370 {
 371         {NDT_NORMAL, "normal"},
 372         {NDT_AIRLIKE, "airlike"},
 373         {NDT_LIQUID, "liquid"},
 374         {NDT_FLOWINGLIQUID, "flowingliquid"},
 375         {NDT_GLASSLIKE, "glasslike"},
 376         {NDT_ALLFACES, "allfaces"},
 377         {NDT_ALLFACES_OPTIONAL, "allfaces_optional"},
 378         {NDT_TORCHLIKE, "torchlike"},
 379         {NDT_SIGNLIKE, "signlike"},
 380         {NDT_PLANTLIKE, "plantlike"},
 381         {NDT_FENCELIKE, "fencelike"},
 382         {NDT_RAILLIKE, "raillike"},
 383         {0, NULL},
 384 };
 385
 386 struct EnumString es_ContentParamType[] =
 387 {
 388         {CPT_NONE, "none"},
 389         {CPT_LIGHT, "light"},
 390         {0, NULL},
 391 };
 392
 393 struct EnumString es_ContentParamType2[] =
 394 {
 395         {CPT2_NONE, "none"},
 396         {CPT2_FULL, "full"},
 397         {CPT2_FLOWINGLIQUID, "flowingliquid"},
 398         {CPT2_FACEDIR, "facedir"},
 399         {CPT2_WALLMOUNTED, "wallmounted"},
 400         {0, NULL},
 401 };
 402
 403 struct EnumString es_LiquidType[] =
 404 {
 405         {LIQUID_NONE, "none"},
 406         {LIQUID_FLOWING, "flowing"},
 407         {LIQUID_SOURCE, "source"},
 408         {0, NULL},
 409 };
 410
 411 struct EnumString es_NodeBoxType[] =
 412 {
 413         {NODEBOX_REGULAR, "regular"},
 414         {NODEBOX_FIXED, "fixed"},
 415         {NODEBOX_WALLMOUNTED, "wallmounted"},
 416         {0, NULL},
 417 };
 418
 419 struct EnumString es_Diggability[] =
 420 {
 421         {DIGGABLE_NOT, "not"},
 422         {DIGGABLE_NORMAL, "normal"},
 423         {DIGGABLE_CONSTANT, "constant"},
 424         {0, NULL},
 425 };
 426
 427 /*
 428         C struct <-> Lua table converter functions
 429 */
 430
 431 static void push_v3f(lua_State *L, v3f p)
 432 {
 433         lua_newtable(L);
 434         lua_pushnumber(L, p.X);
 435         lua_setfield(L, -2, "x");
 436         lua_pushnumber(L, p.Y);
 437         lua_setfield(L, -2, "y");
 438         lua_pushnumber(L, p.Z);
 439         lua_setfield(L, -2, "z");
 440 }
 441
 442 static v2s16 read_v2s16(lua_State *L, int index)
 443 {
 444         v2s16 p;
 445         luaL_checktype(L, index, LUA_TTABLE);
 446         lua_getfield(L, index, "x");
 447         p.X = lua_tonumber(L, -1);
 448         lua_pop(L, 1);
 449         lua_getfield(L, index, "y");
 450         p.Y = lua_tonumber(L, -1);
 451         lua_pop(L, 1);
 452         return p;
 453 }
 454
 455 static v2f read_v2f(lua_State *L, int index)
 456 {
 457         v2f p;
 458         luaL_checktype(L, index, LUA_TTABLE);
 459         lua_getfield(L, index, "x");
 460         p.X = lua_tonumber(L, -1);
 461         lua_pop(L, 1);
 462         lua_getfield(L, index, "y");
 463         p.Y = lua_tonumber(L, -1);
 464         lua_pop(L, 1);
 465         return p;
 466 }
 467
 468 static v3f read_v3f(lua_State *L, int index)
 469 {
 470         v3f pos;
 471         luaL_checktype(L, index, LUA_TTABLE);
 472         lua_getfield(L, index, "x");
 473         pos.X = lua_tonumber(L, -1);
 474         lua_pop(L, 1);
 475         lua_getfield(L, index, "y");
 476         pos.Y = lua_tonumber(L, -1);
 477         lua_pop(L, 1);
 478         lua_getfield(L, index, "z");
 479         pos.Z = lua_tonumber(L, -1);
 480         lua_pop(L, 1);
 481         return pos;
 482 }
 483
 484 static v3f check_v3f(lua_State *L, int index)
 485 {
 486         v3f pos;
 487         luaL_checktype(L, index, LUA_TTABLE);
 488         lua_getfield(L, index, "x");
 489         pos.X = luaL_checknumber(L, -1);
 490         lua_pop(L, 1);
 491         lua_getfield(L, index, "y");
 492         pos.Y = luaL_checknumber(L, -1);
 493         lua_pop(L, 1);
 494         lua_getfield(L, index, "z");
 495         pos.Z = luaL_checknumber(L, -1);
 496         lua_pop(L, 1);
 497         return pos;
 498 }
 499
 500 static void pushFloatPos(lua_State *L, v3f p)
 501 {
 502         p /= BS;
 503         push_v3f(L, p);
 504 }
 505
 506 static v3f checkFloatPos(lua_State *L, int index)
 507 {
 508         return check_v3f(L, index) * BS;
 509 }
 510
 511 static void push_v3s16(lua_State *L, v3s16 p)
 512 {
 513         lua_newtable(L);
 514         lua_pushnumber(L, p.X);
 515         lua_setfield(L, -2, "x");
 516         lua_pushnumber(L, p.Y);
 517         lua_setfield(L, -2, "y");
 518         lua_pushnumber(L, p.Z);
 519         lua_setfield(L, -2, "z");
 520 }
 521
 522 static v3s16 read_v3s16(lua_State *L, int index)
 523 {
 524         // Correct rounding at <0
 525         v3f pf = read_v3f(L, index);
 526         return floatToInt(pf, 1.0);
 527 }
 528
 529 static v3s16 check_v3s16(lua_State *L, int index)
 530 {
 531         // Correct rounding at <0
 532         v3f pf = check_v3f(L, index);
 533         return floatToInt(pf, 1.0);
 534 }
 535
 536 static void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
 537 {
 538         lua_newtable(L);
 539         lua_pushstring(L, ndef->get(n).name.c_str());
 540         lua_setfield(L, -2, "name");
 541         lua_pushnumber(L, n.getParam1());
 542         lua_setfield(L, -2, "param1");
 543         lua_pushnumber(L, n.getParam2());
 544         lua_setfield(L, -2, "param2");
 545 }
 546
 547 static MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
 548 {
 549         lua_getfield(L, index, "name");
 550         const char *name = luaL_checkstring(L, -1);
 551         lua_pop(L, 1);
 552         u8 param1;
 553         lua_getfield(L, index, "param1");
 554         if(lua_isnil(L, -1))
 555                 param1 = 0;
 556         else
 557                 param1 = lua_tonumber(L, -1);
 558         lua_pop(L, 1);
 559         u8 param2;
 560         lua_getfield(L, index, "param2");
 561         if(lua_isnil(L, -1))
 562                 param2 = 0;
 563         else
 564                 param2 = lua_tonumber(L, -1);
 565         lua_pop(L, 1);
 566         return MapNode(ndef, name, param1, param2);
 567 }
 568
 569 static video::SColor readARGB8(lua_State *L, int index)
 570 {
 571         video::SColor color;
 572         luaL_checktype(L, index, LUA_TTABLE);
 573         lua_getfield(L, index, "a");
 574         if(lua_isnumber(L, -1))
 575                 color.setAlpha(lua_tonumber(L, -1));
 576         lua_pop(L, 1);
 577         lua_getfield(L, index, "r");
 578         color.setRed(lua_tonumber(L, -1));
 579         lua_pop(L, 1);
 580         lua_getfield(L, index, "g");
 581         color.setGreen(lua_tonumber(L, -1));
 582         lua_pop(L, 1);
 583         lua_getfield(L, index, "b");
 584         color.setBlue(lua_tonumber(L, -1));
 585         lua_pop(L, 1);
 586         return color;
 587 }
 588
 589 static core::aabbox3d<f32> read_aabbox3df32(lua_State *L, int index, f32 scale)
 590 {
 591         core::aabbox3d<f32> box;
 592         if(lua_istable(L, -1)){
 593                 lua_rawgeti(L, -1, 1);
 594                 box.MinEdge.X = lua_tonumber(L, -1) * scale;
 595                 lua_pop(L, 1);
 596                 lua_rawgeti(L, -1, 2);
 597                 box.MinEdge.Y = lua_tonumber(L, -1) * scale;
 598                 lua_pop(L, 1);
 599                 lua_rawgeti(L, -1, 3);
 600                 box.MinEdge.Z = lua_tonumber(L, -1) * scale;
 601                 lua_pop(L, 1);
 602                 lua_rawgeti(L, -1, 4);
 603                 box.MaxEdge.X = lua_tonumber(L, -1) * scale;
 604                 lua_pop(L, 1);
 605                 lua_rawgeti(L, -1, 5);
 606                 box.MaxEdge.Y = lua_tonumber(L, -1) * scale;
 607                 lua_pop(L, 1);
 608                 lua_rawgeti(L, -1, 6);
 609                 box.MaxEdge.Z = lua_tonumber(L, -1) * scale;
 610                 lua_pop(L, 1);
 611         }
 612         return box;
 613 }
 614
 615 /*
 616         MaterialProperties
 617 */
 618
 619 static MaterialProperties read_material_properties(
 620                 lua_State *L, int table)
 621 {
 622         MaterialProperties prop;
 623         prop.diggability = (Diggability)getenumfield(L, -1, "diggability",
 624                         es_Diggability, DIGGABLE_NORMAL);
 625         getfloatfield(L, -1, "constant_time", prop.constant_time);
 626         getfloatfield(L, -1, "weight", prop.weight);
 627         getfloatfield(L, -1, "crackiness", prop.crackiness);
 628         getfloatfield(L, -1, "crumbliness", prop.crumbliness);
 629         getfloatfield(L, -1, "cuttability", prop.cuttability);
 630         getfloatfield(L, -1, "flammability", prop.flammability);
 631         return prop;
 632 }
 633
 634 /*
 635         ToolDiggingProperties
 636 */
 637
 638 static ToolDiggingProperties read_tool_digging_properties(
 639                 lua_State *L, int table)
 640 {
 641         ToolDiggingProperties prop;
 642         getfloatfield(L, table, "full_punch_interval", prop.full_punch_interval);
 643         getfloatfield(L, table, "basetime", prop.basetime);
 644         getfloatfield(L, table, "dt_weight", prop.dt_weight);
 645         getfloatfield(L, table, "dt_crackiness", prop.dt_crackiness);
 646         getfloatfield(L, table, "dt_crumbliness", prop.dt_crumbliness);
 647         getfloatfield(L, table, "dt_cuttability", prop.dt_cuttability);
 648         getfloatfield(L, table, "basedurability", prop.basedurability);
 649         getfloatfield(L, table, "dd_weight", prop.dd_weight);
 650         getfloatfield(L, table, "dd_crackiness", prop.dd_crackiness);
 651         getfloatfield(L, table, "dd_crumbliness", prop.dd_crumbliness);
 652         getfloatfield(L, table, "dd_cuttability", prop.dd_cuttability);
 653         return prop;
 654 }
 655
 656 static void set_tool_digging_properties(lua_State *L, int table,
 657                 const ToolDiggingProperties &prop)
 658 {
 659         setfloatfield(L, table, "full_punch_interval", prop.full_punch_interval);
 660         setfloatfield(L, table, "basetime", prop.basetime);
 661         setfloatfield(L, table, "dt_weight", prop.dt_weight);
 662         setfloatfield(L, table, "dt_crackiness", prop.dt_crackiness);
 663         setfloatfield(L, table, "dt_crumbliness", prop.dt_crumbliness);
 664         setfloatfield(L, table, "dt_cuttability", prop.dt_cuttability);
 665         setfloatfield(L, table, "basedurability", prop.basedurability);
 666         setfloatfield(L, table, "dd_weight", prop.dd_weight);
 667         setfloatfield(L, table, "dd_crackiness", prop.dd_crackiness);
 668         setfloatfield(L, table, "dd_crumbliness", prop.dd_crumbliness);
 669         setfloatfield(L, table, "dd_cuttability", prop.dd_cuttability);
 670 }
 671
 672 static void push_tool_digging_properties(lua_State *L,
 673                 const ToolDiggingProperties &prop)
 674 {
 675         lua_newtable(L);
 676         set_tool_digging_properties(L, -1, prop);
 677 }
 678
 679 /*
 680         DiggingProperties
 681 */
 682
 683 static void set_digging_properties(lua_State *L, int table,
 684                 const DiggingProperties &prop)
 685 {
 686         setboolfield(L, table, "diggable", prop.diggable);
 687         setfloatfield(L, table, "time", prop.time);
 688         setintfield(L, table, "wear", prop.wear);
 689 }
 690
 691 static void push_digging_properties(lua_State *L,
 692                 const DiggingProperties &prop)
 693 {
 694         lua_newtable(L);
 695         set_digging_properties(L, -1, prop);
 696 }
 697
 698 /*
 699         HittingProperties
 700 */
 701
 702 static void set_hitting_properties(lua_State *L, int table,
 703                 const HittingProperties &prop)
 704 {
 705         setintfield(L, table, "hp", prop.hp);
 706         setintfield(L, table, "wear", prop.wear);
 707 }
 708
 709 static void push_hitting_properties(lua_State *L,
 710                 const HittingProperties &prop)
 711 {
 712         lua_newtable(L);
 713         set_hitting_properties(L, -1, prop);
 714 }
 715
 716 /*
 717         PointedThing
 718 */
 719
 720 static void push_pointed_thing(lua_State *L, const PointedThing& pointed)
 721 {
 722         lua_newtable(L);
 723         if(pointed.type == POINTEDTHING_NODE)
 724         {
 725                 lua_pushstring(L, "node");
 726                 lua_setfield(L, -2, "type");
 727                 push_v3s16(L, pointed.node_undersurface);
 728                 lua_setfield(L, -2, "under");
 729                 push_v3s16(L, pointed.node_abovesurface);
 730                 lua_setfield(L, -2, "above");
 731         }
 732         else if(pointed.type == POINTEDTHING_OBJECT)
 733         {
 734                 lua_pushstring(L, "object");
 735                 lua_setfield(L, -2, "type");
 736                 objectref_get(L, pointed.object_id);
 737                 lua_setfield(L, -2, "ref");
 738         }
 739         else
 740         {
 741                 lua_pushstring(L, "nothing");
 742                 lua_setfield(L, -2, "type");
 743         }
 744 }
 745
 746 /*
 747         ItemDefinition
 748 */
 749
 750 static ItemDefinition read_item_definition(lua_State *L, int index)
 751 {
 752         if(index < 0)
 753                 index = lua_gettop(L) + 1 + index;
 754
 755         // Read the item definition
 756         ItemDefinition def;
 757
 758         def.type = (ItemType)getenumfield(L, index, "type",
 759                         es_ItemType, ITEM_NONE);
 760         getstringfield(L, index, "name", def.name);
 761         getstringfield(L, index, "description", def.description);
 762         getstringfield(L, index, "inventory_image", def.inventory_image);
 763         getstringfield(L, index, "wield_image", def.wield_image);
 764
 765         lua_getfield(L, index, "wield_scale");
 766         if(lua_istable(L, -1)){
 767                 def.wield_scale = check_v3f(L, -1);
 768         }
 769         lua_pop(L, 1);
 770
 771         def.stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
 772         if(def.stack_max == 0)
 773                 def.stack_max = 1;
 774
 775         lua_getfield(L, index, "on_use");
 776         def.usable = lua_isfunction(L, -1);
 777         lua_pop(L, 1);
 778
 779         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
 780
 781         lua_getfield(L, index, "tool_digging_properties");
 782         if(lua_istable(L, -1)){
 783                 def.tool_digging_properties = new ToolDiggingProperties(
 784                                 read_tool_digging_properties(L, -1));
 785         }
 786         lua_pop(L, 1);
 787
 788         // If name is "" (hand), ensure there are ToolDiggingProperties
 789         // because it will be looked up there whenever any other item has
 790         // no ToolDiggingProperties
 791         if(def.name == "" && def.tool_digging_properties == NULL){
 792                 def.tool_digging_properties = new ToolDiggingProperties();
 793         }
 794
 795         return def;
 796 }
 797
 798 /*
 799         ContentFeatures
 800 */
 801
 802 static ContentFeatures read_content_features(lua_State *L, int index)
 803 {
 804         if(index < 0)
 805                 index = lua_gettop(L) + 1 + index;
 806
 807         ContentFeatures f;
 808         getstringfield(L, index, "name", f.name);
 809
 810         /* Visual definition */
 811
 812         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype", es_DrawType,
 813                         NDT_NORMAL);
 814         getfloatfield(L, index, "visual_scale", f.visual_scale);
 815
 816         lua_getfield(L, index, "tile_images");
 817         if(lua_istable(L, -1)){
 818                 int table = lua_gettop(L);
 819                 lua_pushnil(L);
 820                 int i = 0;
 821                 while(lua_next(L, table) != 0){
 822                         // key at index -2 and value at index -1
 823                         if(lua_isstring(L, -1))
 824                                 f.tname_tiles[i] = lua_tostring(L, -1);
 825                         else
 826                                 f.tname_tiles[i] = "";
 827                         // removes value, keeps key for next iteration
 828                         lua_pop(L, 1);
 829                         i++;
 830                         if(i==6){
 831                                 lua_pop(L, 1);
 832                                 break;
 833                         }
 834                 }
 835                 // Copy last value to all remaining textures
 836                 if(i >= 1){
 837                         std::string lastname = f.tname_tiles[i-1];
 838                         while(i < 6){
 839                                 f.tname_tiles[i] = lastname;
 840                                 i++;
 841                         }
 842                 }
 843         }
 844         lua_pop(L, 1);
 845
 846         lua_getfield(L, index, "special_materials");
 847         if(lua_istable(L, -1)){
 848                 int table = lua_gettop(L);
 849                 lua_pushnil(L);
 850                 int i = 0;
 851                 while(lua_next(L, table) != 0){
 852                         // key at index -2 and value at index -1
 853                         int smtable = lua_gettop(L);
 854                         std::string tname = getstringfield_default(
 855                                         L, smtable, "image", "");
 856                         bool backface_culling = getboolfield_default(
 857                                         L, smtable, "backface_culling", true);
 858                         MaterialSpec mspec(tname, backface_culling);
 859                         f.mspec_special[i] = mspec;
 860                         // removes value, keeps key for next iteration
 861                         lua_pop(L, 1);
 862                         i++;
 863                         if(i==6){
 864                                 lua_pop(L, 1);
 865                                 break;
 866                         }
 867                 }
 868         }
 869         lua_pop(L, 1);
 870
 871         f.alpha = getintfield_default(L, index, "alpha", 255);
 872
 873         /* Other stuff */
 874
 875         lua_getfield(L, index, "post_effect_color");
 876         if(!lua_isnil(L, -1))
 877                 f.post_effect_color = readARGB8(L, -1);
 878         lua_pop(L, 1);
 879
 880         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
 881                         es_ContentParamType, CPT_NONE);
 882         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
 883                         es_ContentParamType2, CPT2_NONE);
 884
 885         // Warn about some deprecated fields
 886         warn_if_field_exists(L, index, "wall_mounted",
 887                         "deprecated: use paramtype2 = 'wallmounted'");
 888         warn_if_field_exists(L, index, "light_propagates",
 889                         "deprecated: determined from paramtype");
 890         warn_if_field_exists(L, index, "dug_item",
 891                         "deprecated: use 'drop' field");
 892         warn_if_field_exists(L, index, "extra_dug_item",
 893                         "deprecated: use 'drop' field");
 894         warn_if_field_exists(L, index, "extra_dug_item_rarity",
 895                         "deprecated: use 'drop' field");
 896
 897         // True for all ground-like things like stone and mud, false for eg. trees
 898         getboolfield(L, index, "is_ground_content", f.is_ground_content);
 899         f.light_propagates = (f.param_type == CPT_LIGHT);
 900         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
 901         // This is used for collision detection.
 902         // Also for general solidness queries.
 903         getboolfield(L, index, "walkable", f.walkable);
 904         // Player can point to these
 905         getboolfield(L, index, "pointable", f.pointable);
 906         // Player can dig these
 907         getboolfield(L, index, "diggable", f.diggable);
 908         // Player can climb these
 909         getboolfield(L, index, "climbable", f.climbable);
 910         // Player can build on these
 911         getboolfield(L, index, "buildable_to", f.buildable_to);
 912         // Metadata name of node (eg. "furnace")
 913         getstringfield(L, index, "metadata_name", f.metadata_name);
 914         // Whether the node is non-liquid, source liquid or flowing liquid
 915         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
 916                         es_LiquidType, LIQUID_NONE);
 917         // If the content is liquid, this is the flowing version of the liquid.
 918         getstringfield(L, index, "liquid_alternative_flowing",
 919                         f.liquid_alternative_flowing);
 920         // If the content is liquid, this is the source version of the liquid.
 921         getstringfield(L, index, "liquid_alternative_source",
 922                         f.liquid_alternative_source);
 923         // Viscosity for fluid flow, ranging from 1 to 7, with
 924         // 1 giving almost instantaneous propagation and 7 being
 925         // the slowest possible
 926         f.liquid_viscosity = getintfield_default(L, index,
 927                         "liquid_viscosity", f.liquid_viscosity);
 928         // Amount of light the node emits
 929         f.light_source = getintfield_default(L, index,
 930                         "light_source", f.light_source);
 931         f.damage_per_second = getintfield_default(L, index,
 932                         "damage_per_second", f.damage_per_second);
 933
 934         lua_getfield(L, index, "selection_box");
 935         if(lua_istable(L, -1)){
 936                 f.selection_box.type = (NodeBoxType)getenumfield(L, -1, "type",
 937                                 es_NodeBoxType, NODEBOX_REGULAR);
 938
 939                 lua_getfield(L, -1, "fixed");
 940                 if(lua_istable(L, -1))
 941                         f.selection_box.fixed = read_aabbox3df32(L, -1, BS);
 942                 lua_pop(L, 1);
 943
 944                 lua_getfield(L, -1, "wall_top");
 945                 if(lua_istable(L, -1))
 946                         f.selection_box.wall_top = read_aabbox3df32(L, -1, BS);
 947                 lua_pop(L, 1);
 948
 949                 lua_getfield(L, -1, "wall_bottom");
 950                 if(lua_istable(L, -1))
 951                         f.selection_box.wall_bottom = read_aabbox3df32(L, -1, BS);
 952                 lua_pop(L, 1);
 953
 954                 lua_getfield(L, -1, "wall_side");
 955                 if(lua_istable(L, -1))
 956                         f.selection_box.wall_side = read_aabbox3df32(L, -1, BS);
 957                 lua_pop(L, 1);
 958         }
 959         lua_pop(L, 1);
 960
 961         lua_getfield(L, index, "material");
 962         if(lua_istable(L, -1)){
 963                 f.material = read_material_properties(L, -1);
 964         }
 965         lua_pop(L, 1);
 966
 967         // Set to true if paramtype used to be 'facedir_simple'
 968         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
 969         // Set to true if wall_mounted used to be set to true
 970         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
 971
 972         return f;
 973 }
 974
 975 /*
 976         Inventory stuff
 977 */
 978
 979 static ItemStack read_item(lua_State *L, int index);
 980
 981 static void inventory_set_list_from_lua(Inventory *inv, const char *name,
 982                 lua_State *L, int tableindex, int forcesize=-1)
 983 {
 984         dstream<<"inventory_set_list_from_lua\n";
 985         if(tableindex < 0)
 986                 tableindex = lua_gettop(L) + 1 + tableindex;
 987         // If nil, delete list
 988         if(lua_isnil(L, tableindex)){
 989                 inv->deleteList(name);
 990                 return;
 991         }
 992         // Otherwise set list
 993         std::vector<ItemStack> items;
 994         luaL_checktype(L, tableindex, LUA_TTABLE);
 995         lua_pushnil(L);
 996         while(lua_next(L, tableindex) != 0){
 997                 // key at index -2 and value at index -1
 998                 items.push_back(read_item(L, -1));
 999                 // removes value, keeps key for next iteration
1000                 lua_pop(L, 1);
1001         }
1002         int listsize = (forcesize != -1) ? forcesize : items.size();
1003         InventoryList *invlist = inv->addList(name, listsize);
1004         int index = 0;
1005         for(std::vector<ItemStack>::const_iterator
1006                         i = items.begin(); i != items.end(); i++){
1007                 if(forcesize != -1 && index == forcesize)
1008                         break;
1009                 invlist->changeItem(index, *i);
1010                 index++;
1011         }
1012         while(forcesize != -1 && index < forcesize){
1013                 invlist->deleteItem(index);
1014                 index++;
1015         }
1016         dstream<<"inventory_set_list_from_lua done\n";
1017 }
1018
1019 static void inventory_get_list_to_lua(Inventory *inv, const char *name,
1020                 lua_State *L)
1021 {
1022         InventoryList *invlist = inv->getList(name);
1023         if(invlist == NULL){
1024                 lua_pushnil(L);
1025                 return;
1026         }
1027         // Get the table insert function
1028         lua_getglobal(L, "table");
1029         lua_getfield(L, -1, "insert");
1030         int table_insert = lua_gettop(L);
1031         // Create and fill table
1032         lua_newtable(L);
1033         int table = lua_gettop(L);
1034         for(u32 i=0; i<invlist->getSize(); i++){
1035                 ItemStack item = invlist->getItem(i);
1036                 lua_pushvalue(L, table_insert);
1037                 lua_pushvalue(L, table);
1038                 lua_pushstring(L, item.getItemString().c_str());
1039                 if(lua_pcall(L, 2, 0, 0))
1040                         script_error(L, "error: %s", lua_tostring(L, -1));
1041         }
1042 }
1043
1044 /*
1045         Helpful macros for userdata classes
1046 */
1047
1048 #define method(class, name) {#name, class::l_##name}
1049
1050 /*
1051         LuaItemStack
1052 */
1053
1054 class LuaItemStack
1055 {
1056 private:
1057         ItemStack m_stack;
1058
1059         static const char className[];
1060         static const luaL_reg methods[];
1061
1062         // Exported functions
1063
1064         // garbage collector
1065         static int gc_object(lua_State *L)
1066         {
1067                 LuaItemStack *o = *(LuaItemStack **)(lua_touserdata(L, 1));
1068                 delete o;
1069                 return 0;
1070         }
1071
1072         // is_empty(self) -> true/false
1073         static int l_is_empty(lua_State *L)
1074         {
1075                 LuaItemStack *o = checkobject(L, 1);
1076                 ItemStack &item = o->m_stack;
1077                 lua_pushboolean(L, item.empty());
1078                 return 1;
1079         }
1080
1081         // get_name(self) -> string
1082         static int l_get_name(lua_State *L)
1083         {
1084                 LuaItemStack *o = checkobject(L, 1);
1085                 ItemStack &item = o->m_stack;
1086                 lua_pushstring(L, item.name.c_str());
1087                 return 1;
1088         }
1089
1090         // get_count(self) -> number
1091         static int l_get_count(lua_State *L)
1092         {
1093                 LuaItemStack *o = checkobject(L, 1);
1094                 ItemStack &item = o->m_stack;
1095                 lua_pushinteger(L, item.count);
1096                 return 1;
1097         }
1098
1099         // get_wear(self) -> number
1100         static int l_get_wear(lua_State *L)
1101         {
1102                 LuaItemStack *o = checkobject(L, 1);
1103                 ItemStack &item = o->m_stack;
1104                 lua_pushinteger(L, item.wear);
1105                 return 1;
1106         }
1107
1108         // get_metadata(self) -> string
1109         static int l_get_metadata(lua_State *L)
1110         {
1111                 LuaItemStack *o = checkobject(L, 1);
1112                 ItemStack &item = o->m_stack;
1113                 lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
1114                 return 1;
1115         }
1116
1117         // clear(self) -> true
1118         static int l_clear(lua_State *L)
1119         {
1120                 LuaItemStack *o = checkobject(L, 1);
1121                 o->m_stack.clear();
1122                 lua_pushboolean(L, true);
1123                 return 1;
1124         }
1125
1126         // replace(self, itemstack or itemstring or table or nil) -> true
1127         static int l_replace(lua_State *L)
1128         {
1129                 LuaItemStack *o = checkobject(L, 1);
1130                 o->m_stack = read_item(L, 2);
1131                 lua_pushboolean(L, true);
1132                 return 1;
1133         }
1134
1135         // to_string(self) -> string
1136         static int l_to_string(lua_State *L)
1137         {
1138                 LuaItemStack *o = checkobject(L, 1);
1139                 std::string itemstring = o->m_stack.getItemString();
1140                 lua_pushstring(L, itemstring.c_str());
1141                 return 1;
1142         }
1143
1144         // to_table(self) -> table or nil
1145         static int l_to_table(lua_State *L)
1146         {
1147                 LuaItemStack *o = checkobject(L, 1);
1148                 const ItemStack &item = o->m_stack;
1149                 if(item.empty())
1150                 {
1151                         lua_pushnil(L);
1152                 }
1153                 else
1154                 {
1155                         lua_newtable(L);
1156                         lua_pushstring(L, item.name.c_str());
1157                         lua_setfield(L, -2, "name");
1158                         lua_pushinteger(L, item.count);
1159                         lua_setfield(L, -2, "count");
1160                         lua_pushinteger(L, item.wear);
1161                         lua_setfield(L, -2, "wear");
1162                         lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
1163                         lua_setfield(L, -2, "metadata");
1164                 }
1165                 return 1;
1166         }
1167
1168         // get_stack_max(self) -> number
1169         static int l_get_stack_max(lua_State *L)
1170         {
1171                 LuaItemStack *o = checkobject(L, 1);
1172                 ItemStack &item = o->m_stack;
1173                 lua_pushinteger(L, item.getStackMax(get_server(L)->idef()));
1174                 return 1;
1175         }
1176
1177         // get_free_space(self) -> number
1178         static int l_get_free_space(lua_State *L)
1179         {
1180                 LuaItemStack *o = checkobject(L, 1);
1181                 ItemStack &item = o->m_stack;
1182                 lua_pushinteger(L, item.freeSpace(get_server(L)->idef()));
1183                 return 1;
1184         }
1185
1186         // is_known(self) -> true/false
1187         // Checks if the item is defined.
1188         static int l_is_known(lua_State *L)
1189         {
1190                 LuaItemStack *o = checkobject(L, 1);
1191                 ItemStack &item = o->m_stack;
1192                 bool is_known = item.isKnown(get_server(L)->idef());
1193                 lua_pushboolean(L, is_known);
1194                 return 1;
1195         }
1196
1197         // get_definition(self) -> table
1198         // Returns the item definition table from minetest.registered_items,
1199         // or a fallback one (name="unknown")
1200         static int l_get_definition(lua_State *L)
1201         {
1202                 LuaItemStack *o = checkobject(L, 1);
1203                 ItemStack &item = o->m_stack;
1204
1205                 // Get minetest.registered_items[name]
1206                 lua_getglobal(L, "minetest");
1207                 lua_getfield(L, -1, "registered_items");
1208                 luaL_checktype(L, -1, LUA_TTABLE);
1209                 lua_getfield(L, -1, item.name.c_str());
1210                 if(lua_isnil(L, -1))
1211                 {
1212                         lua_pop(L, 1);
1213                         lua_getfield(L, -1, "unknown");
1214                 }
1215                 return 1;
1216         }
1217
1218         // get_tool_digging_properties(self) -> table
1219         // Returns the effective tool digging properties.
1220         // Returns those of the hand ("") if this item has none associated.
1221         static int l_get_tool_digging_properties(lua_State *L)
1222         {
1223                 LuaItemStack *o = checkobject(L, 1);
1224                 ItemStack &item = o->m_stack;
1225                 const ToolDiggingProperties &prop =
1226                         item.getToolDiggingProperties(get_server(L)->idef());
1227                 push_tool_digging_properties(L, prop);
1228                 return 1;
1229         }
1230
1231         // add_wear(self, amount) -> true/false
1232         // The range for "amount" is [0,65535]. Wear is only added if the item
1233         // is a tool. Adding wear might destroy the item.
1234         // Returns true if the item is (or was) a tool.
1235         static int l_add_wear(lua_State *L)
1236         {
1237                 LuaItemStack *o = checkobject(L, 1);
1238                 ItemStack &item = o->m_stack;
1239                 int amount = lua_tointeger(L, 2);
1240                 bool result = item.addWear(amount, get_server(L)->idef());
1241                 lua_pushboolean(L, result);
1242                 return 1;
1243         }
1244
1245         // add_item(self, itemstack or itemstring or table or nil) -> itemstack
1246         // Returns leftover item stack
1247         static int l_add_item(lua_State *L)
1248         {
1249                 LuaItemStack *o = checkobject(L, 1);
1250                 ItemStack &item = o->m_stack;
1251                 ItemStack newitem = read_item(L, 2);
1252                 ItemStack leftover = item.addItem(newitem, get_server(L)->idef());
1253                 create(L, leftover);
1254                 return 1;
1255         }
1256
1257         // item_fits(self, itemstack or itemstring or table or nil) -> true/false, itemstack
1258         // First return value is true iff the new item fits fully into the stack
1259         // Second return value is the would-be-left-over item stack
1260         static int l_item_fits(lua_State *L)
1261         {
1262                 LuaItemStack *o = checkobject(L, 1);
1263                 ItemStack &item = o->m_stack;
1264                 ItemStack newitem = read_item(L, 2);
1265                 ItemStack restitem;
1266                 bool fits = item.itemFits(newitem, &restitem, get_server(L)->idef());
1267                 lua_pushboolean(L, fits);  // first return value
1268                 create(L, restitem);       // second return value
1269                 return 2;
1270         }
1271
1272         // take_item(self, takecount=1) -> itemstack
1273         static int l_take_item(lua_State *L)
1274         {
1275                 LuaItemStack *o = checkobject(L, 1);
1276                 ItemStack &item = o->m_stack;
1277                 u32 takecount = 1;
1278                 if(!lua_isnone(L, 2))
1279                         takecount = lua_tointeger(L, 2);
1280                 ItemStack taken = item.takeItem(takecount);
1281                 create(L, taken);
1282                 return 1;
1283         }
1284
1285         // peek_item(self, peekcount=1) -> itemstack
1286         static int l_peek_item(lua_State *L)
1287         {
1288                 LuaItemStack *o = checkobject(L, 1);
1289                 ItemStack &item = o->m_stack;
1290                 u32 peekcount = 1;
1291                 if(!lua_isnone(L, 2))
1292                         peekcount = lua_tointeger(L, 2);
1293                 ItemStack peekaboo = item.peekItem(peekcount);
1294                 create(L, peekaboo);
1295                 return 1;
1296         }
1297
1298 public:
1299         LuaItemStack(const ItemStack &item):
1300                 m_stack(item)
1301         {
1302         }
1303
1304         ~LuaItemStack()
1305         {
1306         }
1307
1308         const ItemStack& getItem() const
1309         {
1310                 return m_stack;
1311         }
1312         ItemStack& getItem()
1313         {
1314                 return m_stack;
1315         }
1316
1317         // LuaItemStack(itemstack or itemstring or table or nil)
1318         // Creates an LuaItemStack and leaves it on top of stack
1319         static int create_object(lua_State *L)
1320         {
1321                 ItemStack item = read_item(L, 1);
1322                 LuaItemStack *o = new LuaItemStack(item);
1323                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1324                 luaL_getmetatable(L, className);
1325                 lua_setmetatable(L, -2);
1326                 return 1;
1327         }
1328         // Not callable from Lua
1329         static int create(lua_State *L, const ItemStack &item)
1330         {
1331                 LuaItemStack *o = new LuaItemStack(item);
1332                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1333                 luaL_getmetatable(L, className);
1334                 lua_setmetatable(L, -2);
1335                 return 1;
1336         }
1337
1338         static LuaItemStack* checkobject(lua_State *L, int narg)
1339         {
1340                 luaL_checktype(L, narg, LUA_TUSERDATA);
1341                 void *ud = luaL_checkudata(L, narg, className);
1342                 if(!ud) luaL_typerror(L, narg, className);
1343                 return *(LuaItemStack**)ud;  // unbox pointer
1344         }
1345
1346         static void Register(lua_State *L)
1347         {
1348                 lua_newtable(L);
1349                 int methodtable = lua_gettop(L);
1350                 luaL_newmetatable(L, className);
1351                 int metatable = lua_gettop(L);
1352
1353                 lua_pushliteral(L, "__metatable");
1354                 lua_pushvalue(L, methodtable);
1355                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
1356
1357                 lua_pushliteral(L, "__index");
1358                 lua_pushvalue(L, methodtable);
1359                 lua_settable(L, metatable);
1360
1361                 lua_pushliteral(L, "__gc");
1362                 lua_pushcfunction(L, gc_object);
1363                 lua_settable(L, metatable);
1364
1365                 lua_pop(L, 1);  // drop metatable
1366
1367                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
1368                 lua_pop(L, 1);  // drop methodtable
1369
1370                 // Can be created from Lua (LuaItemStack(itemstack or itemstring or table or nil))
1371                 lua_register(L, className, create_object);
1372         }
1373 };
1374 const char LuaItemStack::className[] = "ItemStack";
1375 const luaL_reg LuaItemStack::methods[] = {
1376         method(LuaItemStack, is_empty),
1377         method(LuaItemStack, get_name),
1378         method(LuaItemStack, get_count),
1379         method(LuaItemStack, get_wear),
1380         method(LuaItemStack, get_metadata),
1381         method(LuaItemStack, clear),
1382         method(LuaItemStack, replace),
1383         method(LuaItemStack, to_string),
1384         method(LuaItemStack, to_table),
1385         method(LuaItemStack, get_stack_max),
1386         method(LuaItemStack, get_free_space),
1387         method(LuaItemStack, is_known),
1388         method(LuaItemStack, get_definition),
1389         method(LuaItemStack, get_tool_digging_properties),
1390         method(LuaItemStack, add_wear),
1391         method(LuaItemStack, add_item),
1392         method(LuaItemStack, item_fits),
1393         method(LuaItemStack, take_item),
1394         method(LuaItemStack, peek_item),
1395         {0,0}
1396 };
1397
1398 static ItemStack read_item(lua_State *L, int index)
1399 {
1400         if(index < 0)
1401                 index = lua_gettop(L) + 1 + index;
1402
1403         if(lua_isnil(L, index))
1404         {
1405                 return ItemStack();
1406         }
1407         else if(lua_isuserdata(L, index))
1408         {
1409                 // Convert from LuaItemStack
1410                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
1411                 return o->getItem();
1412         }
1413         else if(lua_isstring(L, index))
1414         {
1415                 // Convert from itemstring
1416                 std::string itemstring = lua_tostring(L, index);
1417                 IItemDefManager *idef = get_server(L)->idef();
1418                 try
1419                 {
1420                         ItemStack item;
1421                         item.deSerialize(itemstring, idef);
1422                         return item;
1423                 }
1424                 catch(SerializationError &e)
1425                 {
1426                         infostream<<"WARNING: unable to create item from itemstring"
1427                                         <<": "<<itemstring<<std::endl;
1428                         return ItemStack();
1429                 }
1430         }
1431         else if(lua_istable(L, index))
1432         {
1433                 // Convert from table
1434                 IItemDefManager *idef = get_server(L)->idef();
1435                 std::string name = getstringfield_default(L, index, "name", "");
1436                 int count = getintfield_default(L, index, "count", 1);
1437                 int wear = getintfield_default(L, index, "wear", 0);
1438                 std::string metadata = getstringfield_default(L, index, "metadata", "");
1439                 return ItemStack(name, count, wear, metadata, idef);
1440         }
1441         else
1442         {
1443                 throw LuaError(L, "Expecting itemstack, itemstring, table or nil");
1444         }
1445 }
1446
1447 /*
1448         InvRef
1449 */
1450
1451 class InvRef
1452 {
1453 private:
1454         InventoryLocation m_loc;
1455
1456         static const char className[];
1457         static const luaL_reg methods[];
1458
1459         static InvRef *checkobject(lua_State *L, int narg)
1460         {
1461                 luaL_checktype(L, narg, LUA_TUSERDATA);
1462                 void *ud = luaL_checkudata(L, narg, className);
1463                 if(!ud) luaL_typerror(L, narg, className);
1464                 return *(InvRef**)ud;  // unbox pointer
1465         }
1466
1467         static Inventory* getinv(lua_State *L, InvRef *ref)
1468         {
1469                 return get_server(L)->getInventory(ref->m_loc);
1470         }
1471
1472         static InventoryList* getlist(lua_State *L, InvRef *ref,
1473                         const char *listname)
1474         {
1475                 Inventory *inv = getinv(L, ref);
1476                 if(!inv)
1477                         return NULL;
1478                 return inv->getList(listname);
1479         }
1480
1481         static void reportInventoryChange(lua_State *L, InvRef *ref)
1482         {
1483                 // Inform other things that the inventory has changed
1484                 get_server(L)->setInventoryModified(ref->m_loc);
1485         }
1486
1487         // Exported functions
1488
1489         // garbage collector
1490         static int gc_object(lua_State *L) {
1491                 InvRef *o = *(InvRef **)(lua_touserdata(L, 1));
1492                 delete o;
1493                 return 0;
1494         }
1495
1496         // get_size(self, listname)
1497         static int l_get_size(lua_State *L)
1498         {
1499                 InvRef *ref = checkobject(L, 1);
1500                 const char *listname = luaL_checkstring(L, 2);
1501                 InventoryList *list = getlist(L, ref, listname);
1502                 if(list){
1503                         lua_pushinteger(L, list->getSize());
1504                 } else {
1505                         lua_pushinteger(L, 0);
1506                 }
1507                 return 1;
1508         }
1509
1510         // set_size(self, listname, size)
1511         static int l_set_size(lua_State *L)
1512         {
1513                 InvRef *ref = checkobject(L, 1);
1514                 const char *listname = luaL_checkstring(L, 2);
1515                 int newsize = luaL_checknumber(L, 3);
1516                 Inventory *inv = getinv(L, ref);
1517                 if(newsize == 0){
1518                         inv->deleteList(listname);
1519                         reportInventoryChange(L, ref);
1520                         return 0;
1521                 }
1522                 InventoryList *list = inv->getList(listname);
1523                 if(list){
1524                         list->setSize(newsize);
1525                 } else {
1526                         list = inv->addList(listname, newsize);
1527                 }
1528                 reportInventoryChange(L, ref);
1529                 return 0;
1530         }
1531
1532         // get_stack(self, listname, i) -> itemstack
1533         static int l_get_stack(lua_State *L)
1534         {
1535                 InvRef *ref = checkobject(L, 1);
1536                 const char *listname = luaL_checkstring(L, 2);
1537                 int i = luaL_checknumber(L, 3) - 1;
1538                 InventoryList *list = getlist(L, ref, listname);
1539                 ItemStack item;
1540                 if(list != NULL && i >= 0 && i < (int) list->getSize())
1541                         item = list->getItem(i);
1542                 LuaItemStack::create(L, item);
1543                 return 1;
1544         }
1545
1546         // set_stack(self, listname, i, stack) -> true/false
1547         static int l_set_stack(lua_State *L)
1548         {
1549                 InvRef *ref = checkobject(L, 1);
1550                 const char *listname = luaL_checkstring(L, 2);
1551                 int i = luaL_checknumber(L, 3) - 1;
1552                 ItemStack newitem = read_item(L, 4);
1553                 InventoryList *list = getlist(L, ref, listname);
1554                 if(list != NULL && i >= 0 && i < (int) list->getSize()){
1555                         list->changeItem(i, newitem);
1556                         reportInventoryChange(L, ref);
1557                         lua_pushboolean(L, true);
1558                 } else {
1559                         lua_pushboolean(L, false);
1560                 }
1561                 return 1;
1562         }
1563
1564         // get_list(self, listname) -> list or nil
1565         static int l_get_list(lua_State *L)
1566         {
1567                 InvRef *ref = checkobject(L, 1);
1568                 const char *listname = luaL_checkstring(L, 2);
1569                 Inventory *inv = getinv(L, ref);
1570                 inventory_get_list_to_lua(inv, listname, L);
1571                 return 1;
1572         }
1573
1574         // set_list(self, listname, list)
1575         static int l_set_list(lua_State *L)
1576         {
1577                 InvRef *ref = checkobject(L, 1);
1578                 const char *listname = luaL_checkstring(L, 2);
1579                 Inventory *inv = getinv(L, ref);
1580                 InventoryList *list = inv->getList(listname);
1581                 if(list)
1582                         inventory_set_list_from_lua(inv, listname, L, 3,
1583                                         list->getSize());
1584                 else
1585                         inventory_set_list_from_lua(inv, listname, L, 3);
1586                 reportInventoryChange(L, ref);
1587                 return 0;
1588         }
1589
1590         // add_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
1591         // Returns the leftover stack
1592         static int l_add_item(lua_State *L)
1593         {
1594                 InvRef *ref = checkobject(L, 1);
1595                 const char *listname = luaL_checkstring(L, 2);
1596                 ItemStack item = read_item(L, 3);
1597                 InventoryList *list = getlist(L, ref, listname);
1598                 if(list){
1599                         ItemStack leftover = list->addItem(item);
1600                         if(leftover.count != item.count)
1601                                 reportInventoryChange(L, ref);
1602                         LuaItemStack::create(L, leftover);
1603                 } else {
1604                         LuaItemStack::create(L, item);
1605                 }
1606                 return 1;
1607         }
1608
1609         // room_for_item(self, listname, itemstack or itemstring or table or nil) -> true/false
1610         // Returns true if the item completely fits into the list
1611         static int l_room_for_item(lua_State *L)
1612         {
1613                 InvRef *ref = checkobject(L, 1);
1614                 const char *listname = luaL_checkstring(L, 2);
1615                 ItemStack item = read_item(L, 3);
1616                 InventoryList *list = getlist(L, ref, listname);
1617                 if(list){
1618                         lua_pushboolean(L, list->roomForItem(item));
1619                 } else {
1620                         lua_pushboolean(L, false);
1621                 }
1622                 return 1;
1623         }
1624
1625         // contains_item(self, listname, itemstack or itemstring or table or nil) -> true/false
1626         // Returns true if the list contains the given count of the given item name
1627         static int l_contains_item(lua_State *L)
1628         {
1629                 InvRef *ref = checkobject(L, 1);
1630                 const char *listname = luaL_checkstring(L, 2);
1631                 ItemStack item = read_item(L, 3);
1632                 InventoryList *list = getlist(L, ref, listname);
1633                 if(list){
1634                         lua_pushboolean(L, list->containsItem(item));
1635                 } else {
1636                         lua_pushboolean(L, false);
1637                 }
1638                 return 1;
1639         }
1640
1641         // remove_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
1642         // Returns the items that were actually removed
1643         static int l_remove_item(lua_State *L)
1644         {
1645                 InvRef *ref = checkobject(L, 1);
1646                 const char *listname = luaL_checkstring(L, 2);
1647                 ItemStack item = read_item(L, 3);
1648                 InventoryList *list = getlist(L, ref, listname);
1649                 if(list){
1650                         ItemStack removed = list->removeItem(item);
1651                         if(!removed.empty())
1652                                 reportInventoryChange(L, ref);
1653                         LuaItemStack::create(L, removed);
1654                 } else {
1655                         LuaItemStack::create(L, ItemStack());
1656                 }
1657                 return 1;
1658         }
1659
1660 public:
1661         InvRef(const InventoryLocation &loc):
1662                 m_loc(loc)
1663         {
1664         }
1665
1666         ~InvRef()
1667         {
1668         }
1669
1670         // Creates an InvRef and leaves it on top of stack
1671         // Not callable from Lua; all references are created on the C side.
1672         static void create(lua_State *L, const InventoryLocation &loc)
1673         {
1674                 InvRef *o = new InvRef(loc);
1675                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1676                 luaL_getmetatable(L, className);
1677                 lua_setmetatable(L, -2);
1678         }
1679         static void createPlayer(lua_State *L, Player *player)
1680         {
1681                 InventoryLocation loc;
1682                 loc.setPlayer(player->getName());
1683                 create(L, loc);
1684         }
1685         static void createNodeMeta(lua_State *L, v3s16 p)
1686         {
1687                 InventoryLocation loc;
1688                 loc.setNodeMeta(p);
1689                 create(L, loc);
1690         }
1691
1692         static void Register(lua_State *L)
1693         {
1694                 lua_newtable(L);
1695                 int methodtable = lua_gettop(L);
1696                 luaL_newmetatable(L, className);
1697                 int metatable = lua_gettop(L);
1698
1699                 lua_pushliteral(L, "__metatable");
1700                 lua_pushvalue(L, methodtable);
1701                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
1702
1703                 lua_pushliteral(L, "__index");
1704                 lua_pushvalue(L, methodtable);
1705                 lua_settable(L, metatable);
1706
1707                 lua_pushliteral(L, "__gc");
1708                 lua_pushcfunction(L, gc_object);
1709                 lua_settable(L, metatable);
1710
1711                 lua_pop(L, 1);  // drop metatable
1712
1713                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
1714                 lua_pop(L, 1);  // drop methodtable
1715
1716                 // Cannot be created from Lua
1717                 //lua_register(L, className, create_object);
1718         }
1719 };
1720 const char InvRef::className[] = "InvRef";
1721 const luaL_reg InvRef::methods[] = {
1722         method(InvRef, get_size),
1723         method(InvRef, set_size),
1724         method(InvRef, get_stack),
1725         method(InvRef, set_stack),
1726         method(InvRef, get_list),
1727         method(InvRef, set_list),
1728         method(InvRef, add_item),
1729         method(InvRef, room_for_item),
1730         method(InvRef, contains_item),
1731         method(InvRef, remove_item),
1732         {0,0}
1733 };
1734
1735 /*
1736         NodeMetaRef
1737 */
1738
1739 class NodeMetaRef
1740 {
1741 private:
1742         v3s16 m_p;
1743         ServerEnvironment *m_env;
1744
1745         static const char className[];
1746         static const luaL_reg methods[];
1747
1748         static NodeMetaRef *checkobject(lua_State *L, int narg)
1749         {
1750                 luaL_checktype(L, narg, LUA_TUSERDATA);
1751                 void *ud = luaL_checkudata(L, narg, className);
1752                 if(!ud) luaL_typerror(L, narg, className);
1753                 return *(NodeMetaRef**)ud;  // unbox pointer
1754         }
1755
1756         static NodeMetadata* getmeta(NodeMetaRef *ref)
1757         {
1758                 NodeMetadata *meta = ref->m_env->getMap().getNodeMetadata(ref->m_p);
1759                 return meta;
1760         }
1761
1762         /*static IGenericNodeMetadata* getgenericmeta(NodeMetaRef *ref)
1763         {
1764                 NodeMetadata *meta = getmeta(ref);
1765                 if(meta == NULL)
1766                         return NULL;
1767                 if(meta->typeId() != NODEMETA_GENERIC)
1768                         return NULL;
1769                 return (IGenericNodeMetadata*)meta;
1770         }*/
1771
1772         static void reportMetadataChange(NodeMetaRef *ref)
1773         {
1774                 // Inform other things that the metadata has changed
1775                 v3s16 blockpos = getNodeBlockPos(ref->m_p);
1776                 MapEditEvent event;
1777                 event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
1778                 event.p = blockpos;
1779                 ref->m_env->getMap().dispatchEvent(&event);
1780                 // Set the block to be saved
1781                 MapBlock *block = ref->m_env->getMap().getBlockNoCreateNoEx(blockpos);
1782                 if(block)
1783                         block->raiseModified(MOD_STATE_WRITE_NEEDED,
1784                                         "NodeMetaRef::reportMetadataChange");
1785         }
1786
1787         // Exported functions
1788
1789         // garbage collector
1790         static int gc_object(lua_State *L) {
1791                 NodeMetaRef *o = *(NodeMetaRef **)(lua_touserdata(L, 1));
1792                 delete o;
1793                 return 0;
1794         }
1795
1796         // get_type(self)
1797         static int l_get_type(lua_State *L)
1798         {
1799                 NodeMetaRef *ref = checkobject(L, 1);
1800                 NodeMetadata *meta = getmeta(ref);
1801                 if(meta == NULL){
1802                         lua_pushnil(L);
1803                         return 1;
1804                 }
1805                 // Do it
1806                 lua_pushstring(L, meta->typeName());
1807                 return 1;
1808         }
1809
1810         // allows_text_input(self)
1811         static int l_allows_text_input(lua_State *L)
1812         {
1813                 NodeMetaRef *ref = checkobject(L, 1);
1814                 NodeMetadata *meta = getmeta(ref);
1815                 if(meta == NULL) return 0;
1816                 // Do it
1817                 lua_pushboolean(L, meta->allowsTextInput());
1818                 return 1;
1819         }
1820
1821         // set_text(self, text)
1822         static int l_set_text(lua_State *L)
1823         {
1824                 NodeMetaRef *ref = checkobject(L, 1);
1825                 NodeMetadata *meta = getmeta(ref);
1826                 if(meta == NULL) return 0;
1827                 // Do it
1828                 std::string text = luaL_checkstring(L, 2);
1829                 meta->setText(text);
1830                 reportMetadataChange(ref);
1831                 return 0;
1832         }
1833
1834         // get_text(self)
1835         static int l_get_text(lua_State *L)
1836         {
1837                 NodeMetaRef *ref = checkobject(L, 1);
1838                 NodeMetadata *meta = getmeta(ref);
1839                 if(meta == NULL) return 0;
1840                 // Do it
1841                 std::string text = meta->getText();
1842                 lua_pushstring(L, text.c_str());
1843                 return 1;
1844         }
1845
1846         // get_owner(self)
1847         static int l_get_owner(lua_State *L)
1848         {
1849                 NodeMetaRef *ref = checkobject(L, 1);
1850                 NodeMetadata *meta = getmeta(ref);
1851                 if(meta == NULL) return 0;
1852                 // Do it
1853                 std::string owner = meta->getOwner();
1854                 lua_pushstring(L, owner.c_str());
1855                 return 1;
1856         }
1857
1858         // set_owner(self, string)
1859         static int l_set_owner(lua_State *L)
1860         {
1861                 NodeMetaRef *ref = checkobject(L, 1);
1862                 NodeMetadata *meta = getmeta(ref);
1863                 if(meta == NULL) return 0;
1864                 // Do it
1865                 std::string owner = luaL_checkstring(L, 2);
1866                 meta->setOwner(owner);
1867                 reportMetadataChange(ref);
1868                 return 1;
1869         }
1870
1871         // get_allow_removal(self)
1872         static int l_get_allow_removal(lua_State *L)
1873         {
1874                 NodeMetaRef *ref = checkobject(L, 1);
1875                 NodeMetadata *meta = getmeta(ref);
1876                 if(meta == NULL){
1877                         lua_pushboolean(L, true);
1878                         return 1;
1879                 }
1880                 // Do it
1881                 lua_pushboolean(L, !meta->nodeRemovalDisabled());
1882                 return 1;
1883         }
1884
1885         /* IGenericNodeMetadata interface */
1886
1887         // set_infotext(self, text)
1888         static int l_set_infotext(lua_State *L)
1889         {
1890                 NodeMetaRef *ref = checkobject(L, 1);
1891                 NodeMetadata *meta = getmeta(ref);
1892                 if(meta == NULL) return 0;
1893                 // Do it
1894                 std::string text = luaL_checkstring(L, 2);
1895                 meta->setInfoText(text);
1896                 reportMetadataChange(ref);
1897                 return 0;
1898         }
1899
1900         // get_inventory(self)
1901         static int l_get_inventory(lua_State *L)
1902         {
1903                 NodeMetaRef *ref = checkobject(L, 1);
1904                 NodeMetadata *meta = getmeta(ref);
1905                 if(meta == NULL) return 0;
1906                 // Do it
1907                 InvRef::createNodeMeta(L, ref->m_p);
1908                 return 1;
1909         }
1910
1911         // set_inventory_draw_spec(self, text)
1912         static int l_set_inventory_draw_spec(lua_State *L)
1913         {
1914                 NodeMetaRef *ref = checkobject(L, 1);
1915                 NodeMetadata *meta = getmeta(ref);
1916                 if(meta == NULL) return 0;
1917                 // Do it
1918                 std::string text = luaL_checkstring(L, 2);
1919                 meta->setInventoryDrawSpec(text);
1920                 reportMetadataChange(ref);
1921                 return 0;
1922         }
1923
1924         // set_allow_text_input(self, text)
1925         static int l_set_allow_text_input(lua_State *L)
1926         {
1927                 NodeMetaRef *ref = checkobject(L, 1);
1928                 NodeMetadata *meta = getmeta(ref);
1929                 if(meta == NULL) return 0;
1930                 // Do it
1931                 bool b = lua_toboolean(L, 2);
1932                 meta->setAllowTextInput(b);
1933                 reportMetadataChange(ref);
1934                 return 0;
1935         }
1936
1937         // set_allow_removal(self, text)
1938         static int l_set_allow_removal(lua_State *L)
1939         {
1940                 NodeMetaRef *ref = checkobject(L, 1);
1941                 NodeMetadata *meta = getmeta(ref);
1942                 if(meta == NULL) return 0;
1943                 // Do it
1944                 bool b = lua_toboolean(L, 2);
1945                 meta->setRemovalDisabled(!b);
1946                 reportMetadataChange(ref);
1947                 return 0;
1948         }
1949
1950         // set_enforce_owner(self, text)
1951         static int l_set_enforce_owner(lua_State *L)
1952         {
1953                 NodeMetaRef *ref = checkobject(L, 1);
1954                 NodeMetadata *meta = getmeta(ref);
1955                 if(meta == NULL) return 0;
1956                 // Do it
1957                 bool b = lua_toboolean(L, 2);
1958                 meta->setEnforceOwner(b);
1959                 reportMetadataChange(ref);
1960                 return 0;
1961         }
1962
1963         // is_inventory_modified(self)
1964         static int l_is_inventory_modified(lua_State *L)
1965         {
1966                 NodeMetaRef *ref = checkobject(L, 1);
1967                 NodeMetadata *meta = getmeta(ref);
1968                 if(meta == NULL) return 0;
1969                 // Do it
1970                 lua_pushboolean(L, meta->isInventoryModified());
1971                 return 1;
1972         }
1973
1974         // reset_inventory_modified(self)
1975         static int l_reset_inventory_modified(lua_State *L)
1976         {
1977                 NodeMetaRef *ref = checkobject(L, 1);
1978                 NodeMetadata *meta = getmeta(ref);
1979                 if(meta == NULL) return 0;
1980                 // Do it
1981                 meta->resetInventoryModified();
1982                 reportMetadataChange(ref);
1983                 return 0;
1984         }
1985
1986         // is_text_modified(self)
1987         static int l_is_text_modified(lua_State *L)
1988         {
1989                 NodeMetaRef *ref = checkobject(L, 1);
1990                 NodeMetadata *meta = getmeta(ref);
1991                 if(meta == NULL) return 0;
1992                 // Do it
1993                 lua_pushboolean(L, meta->isTextModified());
1994                 return 1;
1995         }
1996
1997         // reset_text_modified(self)
1998         static int l_reset_text_modified(lua_State *L)
1999         {
2000                 NodeMetaRef *ref = checkobject(L, 1);
2001                 NodeMetadata *meta = getmeta(ref);
2002                 if(meta == NULL) return 0;
2003                 // Do it
2004                 meta->resetTextModified();
2005                 reportMetadataChange(ref);
2006                 return 0;
2007         }
2008
2009         // set_string(self, name, var)
2010         static int l_set_string(lua_State *L)
2011         {
2012                 NodeMetaRef *ref = checkobject(L, 1);
2013                 NodeMetadata *meta = getmeta(ref);
2014                 if(meta == NULL) return 0;
2015                 // Do it
2016                 std::string name = luaL_checkstring(L, 2);
2017                 size_t len = 0;
2018                 const char *s = lua_tolstring(L, 3, &len);
2019                 std::string str(s, len);
2020                 meta->setString(name, str);
2021                 reportMetadataChange(ref);
2022                 return 0;
2023         }
2024
2025         // get_string(self, name)
2026         static int l_get_string(lua_State *L)
2027         {
2028                 NodeMetaRef *ref = checkobject(L, 1);
2029                 NodeMetadata *meta = getmeta(ref);
2030                 if(meta == NULL) return 0;
2031                 // Do it
2032                 std::string name = luaL_checkstring(L, 2);
2033                 std::string str = meta->getString(name);
2034                 lua_pushlstring(L, str.c_str(), str.size());
2035                 return 1;
2036         }
2037
2038 public:
2039         NodeMetaRef(v3s16 p, ServerEnvironment *env):
2040                 m_p(p),
2041                 m_env(env)
2042         {
2043         }
2044
2045         ~NodeMetaRef()
2046         {
2047         }
2048
2049         // Creates an NodeMetaRef and leaves it on top of stack
2050         // Not callable from Lua; all references are created on the C side.
2051         static void create(lua_State *L, v3s16 p, ServerEnvironment *env)
2052         {
2053                 NodeMetaRef *o = new NodeMetaRef(p, env);
2054                 //infostream<<"NodeMetaRef::create: o="<<o<<std::endl;
2055                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2056                 luaL_getmetatable(L, className);
2057                 lua_setmetatable(L, -2);
2058         }
2059
2060         static void Register(lua_State *L)
2061         {
2062                 lua_newtable(L);
2063                 int methodtable = lua_gettop(L);
2064                 luaL_newmetatable(L, className);
2065                 int metatable = lua_gettop(L);
2066
2067                 lua_pushliteral(L, "__metatable");
2068                 lua_pushvalue(L, methodtable);
2069                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2070
2071                 lua_pushliteral(L, "__index");
2072                 lua_pushvalue(L, methodtable);
2073                 lua_settable(L, metatable);
2074
2075                 lua_pushliteral(L, "__gc");
2076                 lua_pushcfunction(L, gc_object);
2077                 lua_settable(L, metatable);
2078
2079                 lua_pop(L, 1);  // drop metatable
2080
2081                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2082                 lua_pop(L, 1);  // drop methodtable
2083
2084                 // Cannot be created from Lua
2085                 //lua_register(L, className, create_object);
2086         }
2087 };
2088 const char NodeMetaRef::className[] = "NodeMetaRef";
2089 const luaL_reg NodeMetaRef::methods[] = {
2090         method(NodeMetaRef, get_type),
2091         method(NodeMetaRef, allows_text_input),
2092         method(NodeMetaRef, set_text),
2093         method(NodeMetaRef, get_text),
2094         method(NodeMetaRef, get_owner),
2095         method(NodeMetaRef, set_owner),
2096         method(NodeMetaRef, get_allow_removal),
2097         method(NodeMetaRef, set_infotext),
2098         method(NodeMetaRef, get_inventory),
2099         method(NodeMetaRef, set_inventory_draw_spec),
2100         method(NodeMetaRef, set_allow_text_input),
2101         method(NodeMetaRef, set_allow_removal),
2102         method(NodeMetaRef, set_enforce_owner),
2103         method(NodeMetaRef, is_inventory_modified),
2104         method(NodeMetaRef, reset_inventory_modified),
2105         method(NodeMetaRef, is_text_modified),
2106         method(NodeMetaRef, reset_text_modified),
2107         method(NodeMetaRef, set_string),
2108         method(NodeMetaRef, get_string),
2109         {0,0}
2110 };
2111
2112 /*
2113         ObjectRef
2114 */
2115
2116 class ObjectRef
2117 {
2118 private:
2119         ServerActiveObject *m_object;
2120
2121         static const char className[];
2122         static const luaL_reg methods[];
2123
2124         static ObjectRef *checkobject(lua_State *L, int narg)
2125         {
2126                 luaL_checktype(L, narg, LUA_TUSERDATA);
2127                 void *ud = luaL_checkudata(L, narg, className);
2128                 if(!ud) luaL_typerror(L, narg, className);
2129                 return *(ObjectRef**)ud;  // unbox pointer
2130         }
2131
2132         static ServerActiveObject* getobject(ObjectRef *ref)
2133         {
2134                 ServerActiveObject *co = ref->m_object;
2135                 return co;
2136         }
2137
2138         static LuaEntitySAO* getluaobject(ObjectRef *ref)
2139         {
2140                 ServerActiveObject *obj = getobject(ref);
2141                 if(obj == NULL)
2142                         return NULL;
2143                 if(obj->getType() != ACTIVEOBJECT_TYPE_LUAENTITY)
2144                         return NULL;
2145                 return (LuaEntitySAO*)obj;
2146         }
2147
2148         static ServerRemotePlayer* getplayer(ObjectRef *ref)
2149         {
2150                 ServerActiveObject *obj = getobject(ref);
2151                 if(obj == NULL)
2152                         return NULL;
2153                 if(obj->getType() != ACTIVEOBJECT_TYPE_PLAYER)
2154                         return NULL;
2155                 return static_cast<ServerRemotePlayer*>(obj);
2156         }
2157
2158         // Exported functions
2159
2160         // garbage collector
2161         static int gc_object(lua_State *L) {
2162                 ObjectRef *o = *(ObjectRef **)(lua_touserdata(L, 1));
2163                 //infostream<<"ObjectRef::gc_object: o="<<o<<std::endl;
2164                 delete o;
2165                 return 0;
2166         }
2167
2168         // remove(self)
2169         static int l_remove(lua_State *L)
2170         {
2171                 ObjectRef *ref = checkobject(L, 1);
2172                 ServerActiveObject *co = getobject(ref);
2173                 if(co == NULL) return 0;
2174                 infostream<<"ObjectRef::l_remove(): id="<<co->getId()<<std::endl;
2175                 co->m_removed = true;
2176                 return 0;
2177         }
2178
2179         // getpos(self)
2180         // returns: {x=num, y=num, z=num}
2181         static int l_getpos(lua_State *L)
2182         {
2183                 ObjectRef *ref = checkobject(L, 1);
2184                 ServerActiveObject *co = getobject(ref);
2185                 if(co == NULL) return 0;
2186                 v3f pos = co->getBasePosition() / BS;
2187                 lua_newtable(L);
2188                 lua_pushnumber(L, pos.X);
2189                 lua_setfield(L, -2, "x");
2190                 lua_pushnumber(L, pos.Y);
2191                 lua_setfield(L, -2, "y");
2192                 lua_pushnumber(L, pos.Z);
2193                 lua_setfield(L, -2, "z");
2194                 return 1;
2195         }
2196
2197         // setpos(self, pos)
2198         static int l_setpos(lua_State *L)
2199         {
2200                 ObjectRef *ref = checkobject(L, 1);
2201                 //LuaEntitySAO *co = getluaobject(ref);
2202                 ServerActiveObject *co = getobject(ref);
2203                 if(co == NULL) return 0;
2204                 // pos
2205                 v3f pos = checkFloatPos(L, 2);
2206                 // Do it
2207                 co->setPos(pos);
2208                 // Move player if applicable
2209                 ServerRemotePlayer *player = getplayer(ref);
2210                 if(player != NULL)
2211                         get_server(L)->SendMovePlayer(player);
2212                 return 0;
2213         }
2214
2215         // moveto(self, pos, continuous=false)
2216         static int l_moveto(lua_State *L)
2217         {
2218                 ObjectRef *ref = checkobject(L, 1);
2219                 //LuaEntitySAO *co = getluaobject(ref);
2220                 ServerActiveObject *co = getobject(ref);
2221                 if(co == NULL) return 0;
2222                 // pos
2223                 v3f pos = checkFloatPos(L, 2);
2224                 // continuous
2225                 bool continuous = lua_toboolean(L, 3);
2226                 // Do it
2227                 co->moveTo(pos, continuous);
2228                 return 0;
2229         }
2230
2231         // punch(self, puncher); puncher = an another ObjectRef
2232         static int l_punch(lua_State *L)
2233         {
2234                 ObjectRef *ref = checkobject(L, 1);
2235                 ObjectRef *ref2 = checkobject(L, 2);
2236                 ServerActiveObject *co = getobject(ref);
2237                 ServerActiveObject *co2 = getobject(ref2);
2238                 if(co == NULL) return 0;
2239                 if(co2 == NULL) return 0;
2240                 // Do it
2241                 co->punch(co2);
2242                 return 0;
2243         }
2244
2245         // right_click(self, clicker); clicker = an another ObjectRef
2246         static int l_right_click(lua_State *L)
2247         {
2248                 ObjectRef *ref = checkobject(L, 1);
2249                 ObjectRef *ref2 = checkobject(L, 2);
2250                 ServerActiveObject *co = getobject(ref);
2251                 ServerActiveObject *co2 = getobject(ref2);
2252                 if(co == NULL) return 0;
2253                 if(co2 == NULL) return 0;
2254                 // Do it
2255                 co->rightClick(co2);
2256                 return 0;
2257         }
2258
2259         // set_hp(self, hp)
2260         // hp = number of hitpoints (2 * number of hearts)
2261         // returns: nil
2262         static int l_set_hp(lua_State *L)
2263         {
2264                 ObjectRef *ref = checkobject(L, 1);
2265                 luaL_checknumber(L, 2);
2266                 ServerActiveObject *co = getobject(ref);
2267                 if(co == NULL) return 0;
2268                 int hp = lua_tonumber(L, 2);
2269                 infostream<<"ObjectRef::l_set_hp(): id="<<co->getId()
2270                                 <<" hp="<<hp<<std::endl;
2271                 // Do it
2272                 co->setHP(hp);
2273                 // Return
2274                 return 0;
2275         }
2276
2277         // get_hp(self)
2278         // returns: number of hitpoints (2 * number of hearts)
2279         // 0 if not applicable to this type of object
2280         static int l_get_hp(lua_State *L)
2281         {
2282                 ObjectRef *ref = checkobject(L, 1);
2283                 ServerActiveObject *co = getobject(ref);
2284                 if(co == NULL) return 0;
2285                 int hp = co->getHP();
2286                 infostream<<"ObjectRef::l_get_hp(): id="<<co->getId()
2287                                 <<" hp="<<hp<<std::endl;
2288                 // Return
2289                 lua_pushnumber(L, hp);
2290                 return 1;
2291         }
2292
2293         // get_inventory(self)
2294         static int l_get_inventory(lua_State *L)
2295         {
2296                 ObjectRef *ref = checkobject(L, 1);
2297                 ServerActiveObject *co = getobject(ref);
2298                 if(co == NULL) return 0;
2299                 // Do it
2300                 InventoryLocation loc = co->getInventoryLocation();
2301                 if(get_server(L)->getInventory(loc) != NULL)
2302                         InvRef::create(L, loc);
2303                 else
2304                         lua_pushnil(L);
2305                 return 1;
2306         }
2307
2308         // get_wield_list(self)
2309         static int l_get_wield_list(lua_State *L)
2310         {
2311                 ObjectRef *ref = checkobject(L, 1);
2312                 ServerActiveObject *co = getobject(ref);
2313                 if(co == NULL) return 0;
2314                 // Do it
2315                 lua_pushstring(L, co->getWieldList().c_str());
2316                 return 1;
2317         }
2318
2319         // get_wield_index(self)
2320         static int l_get_wield_index(lua_State *L)
2321         {
2322                 ObjectRef *ref = checkobject(L, 1);
2323                 ServerActiveObject *co = getobject(ref);
2324                 if(co == NULL) return 0;
2325                 // Do it
2326                 lua_pushinteger(L, co->getWieldIndex() + 1);
2327                 return 1;
2328         }
2329
2330         // get_wielded_item(self)
2331         static int l_get_wielded_item(lua_State *L)
2332         {
2333                 ObjectRef *ref = checkobject(L, 1);
2334                 ServerActiveObject *co = getobject(ref);
2335                 if(co == NULL) return 0;
2336                 // Do it
2337                 LuaItemStack::create(L, co->getWieldedItem());
2338                 return 1;
2339         }
2340
2341         // set_wielded_item(self, itemstack or itemstring or table or nil)
2342         static int l_set_wielded_item(lua_State *L)
2343         {
2344                 ObjectRef *ref = checkobject(L, 1);
2345                 ServerActiveObject *co = getobject(ref);
2346                 if(co == NULL) return 0;
2347                 // Do it
2348                 ItemStack item = read_item(L, 2);
2349                 bool success = co->setWieldedItem(item);
2350                 lua_pushboolean(L, success);
2351                 return 1;
2352         }
2353
2354         /* LuaEntitySAO-only */
2355
2356         // setvelocity(self, {x=num, y=num, z=num})
2357         static int l_setvelocity(lua_State *L)
2358         {
2359                 ObjectRef *ref = checkobject(L, 1);
2360                 LuaEntitySAO *co = getluaobject(ref);
2361                 if(co == NULL) return 0;
2362                 // pos
2363                 v3f pos = checkFloatPos(L, 2);
2364                 // Do it
2365                 co->setVelocity(pos);
2366                 return 0;
2367         }
2368
2369         // getvelocity(self)
2370         static int l_getvelocity(lua_State *L)
2371         {
2372                 ObjectRef *ref = checkobject(L, 1);
2373                 LuaEntitySAO *co = getluaobject(ref);
2374                 if(co == NULL) return 0;
2375                 // Do it
2376                 v3f v = co->getVelocity();
2377                 pushFloatPos(L, v);
2378                 return 1;
2379         }
2380
2381         // setacceleration(self, {x=num, y=num, z=num})
2382         static int l_setacceleration(lua_State *L)
2383         {
2384                 ObjectRef *ref = checkobject(L, 1);
2385                 LuaEntitySAO *co = getluaobject(ref);
2386                 if(co == NULL) return 0;
2387                 // pos
2388                 v3f pos = checkFloatPos(L, 2);
2389                 // Do it
2390                 co->setAcceleration(pos);
2391                 return 0;
2392         }
2393
2394         // getacceleration(self)
2395         static int l_getacceleration(lua_State *L)
2396         {
2397                 ObjectRef *ref = checkobject(L, 1);
2398                 LuaEntitySAO *co = getluaobject(ref);
2399                 if(co == NULL) return 0;
2400                 // Do it
2401                 v3f v = co->getAcceleration();
2402                 pushFloatPos(L, v);
2403                 return 1;
2404         }
2405
2406         // setyaw(self, radians)
2407         static int l_setyaw(lua_State *L)
2408         {
2409                 ObjectRef *ref = checkobject(L, 1);
2410                 LuaEntitySAO *co = getluaobject(ref);
2411                 if(co == NULL) return 0;
2412                 // pos
2413                 float yaw = luaL_checknumber(L, 2) * core::RADTODEG;
2414                 // Do it
2415                 co->setYaw(yaw);
2416                 return 0;
2417         }
2418
2419         // getyaw(self)
2420         static int l_getyaw(lua_State *L)
2421         {
2422                 ObjectRef *ref = checkobject(L, 1);
2423                 LuaEntitySAO *co = getluaobject(ref);
2424                 if(co == NULL) return 0;
2425                 // Do it
2426                 float yaw = co->getYaw() * core::DEGTORAD;
2427                 lua_pushnumber(L, yaw);
2428                 return 1;
2429         }
2430
2431         // settexturemod(self, mod)
2432         static int l_settexturemod(lua_State *L)
2433         {
2434                 ObjectRef *ref = checkobject(L, 1);
2435                 LuaEntitySAO *co = getluaobject(ref);
2436                 if(co == NULL) return 0;
2437                 // Do it
2438                 std::string mod = luaL_checkstring(L, 2);
2439                 co->setTextureMod(mod);
2440                 return 0;
2441         }
2442
2443         // setsprite(self, p={x=0,y=0}, num_frames=1, framelength=0.2,
2444         //           select_horiz_by_yawpitch=false)
2445         static int l_setsprite(lua_State *L)
2446         {
2447                 ObjectRef *ref = checkobject(L, 1);
2448                 LuaEntitySAO *co = getluaobject(ref);
2449                 if(co == NULL) return 0;
2450                 // Do it
2451                 v2s16 p(0,0);
2452                 if(!lua_isnil(L, 2))
2453                         p = read_v2s16(L, 2);
2454                 int num_frames = 1;
2455                 if(!lua_isnil(L, 3))
2456                         num_frames = lua_tonumber(L, 3);
2457                 float framelength = 0.2;
2458                 if(!lua_isnil(L, 4))
2459                         framelength = lua_tonumber(L, 4);
2460                 bool select_horiz_by_yawpitch = false;
2461                 if(!lua_isnil(L, 5))
2462                         select_horiz_by_yawpitch = lua_toboolean(L, 5);
2463                 co->setSprite(p, num_frames, framelength, select_horiz_by_yawpitch);
2464                 return 0;
2465         }
2466
2467         // DEPRECATED
2468         // get_entity_name(self)
2469         static int l_get_entity_name(lua_State *L)
2470         {
2471                 ObjectRef *ref = checkobject(L, 1);
2472                 LuaEntitySAO *co = getluaobject(ref);
2473                 if(co == NULL) return 0;
2474                 // Do it
2475                 std::string name = co->getName();
2476                 lua_pushstring(L, name.c_str());
2477                 return 1;
2478         }
2479
2480         // get_luaentity(self)
2481         static int l_get_luaentity(lua_State *L)
2482         {
2483                 ObjectRef *ref = checkobject(L, 1);
2484                 LuaEntitySAO *co = getluaobject(ref);
2485                 if(co == NULL) return 0;
2486                 // Do it
2487                 luaentity_get(L, co->getId());
2488                 return 1;
2489         }
2490
2491         /* Player-only */
2492
2493         // get_player_name(self)
2494         static int l_get_player_name(lua_State *L)
2495         {
2496                 ObjectRef *ref = checkobject(L, 1);
2497                 ServerRemotePlayer *player = getplayer(ref);
2498                 if(player == NULL){
2499                         lua_pushnil(L);
2500                         return 1;
2501                 }
2502                 // Do it
2503                 lua_pushstring(L, player->getName());
2504                 return 1;
2505         }
2506
2507         // get_look_dir(self)
2508         static int l_get_look_dir(lua_State *L)
2509         {
2510                 ObjectRef *ref = checkobject(L, 1);
2511                 ServerRemotePlayer *player = getplayer(ref);
2512                 if(player == NULL) return 0;
2513                 // Do it
2514                 float pitch = player->getRadPitch();
2515                 float yaw = player->getRadYaw();
2516                 v3f v(cos(pitch)*cos(yaw), sin(pitch), cos(pitch)*sin(yaw));
2517                 push_v3f(L, v);
2518                 return 1;
2519         }
2520
2521         // get_look_pitch(self)
2522         static int l_get_look_pitch(lua_State *L)
2523         {
2524                 ObjectRef *ref = checkobject(L, 1);
2525                 ServerRemotePlayer *player = getplayer(ref);
2526                 if(player == NULL) return 0;
2527                 // Do it
2528                 lua_pushnumber(L, player->getRadPitch());
2529                 return 1;
2530         }
2531
2532         // get_look_yaw(self)
2533         static int l_get_look_yaw(lua_State *L)
2534         {
2535                 ObjectRef *ref = checkobject(L, 1);
2536                 ServerRemotePlayer *player = getplayer(ref);
2537                 if(player == NULL) return 0;
2538                 // Do it
2539                 lua_pushnumber(L, player->getRadYaw());
2540                 return 1;
2541         }
2542
2543 public:
2544         ObjectRef(ServerActiveObject *object):
2545                 m_object(object)
2546         {
2547                 //infostream<<"ObjectRef created for id="<<m_object->getId()<<std::endl;
2548         }
2549
2550         ~ObjectRef()
2551         {
2552                 /*if(m_object)
2553                         infostream<<"ObjectRef destructing for id="
2554                                         <<m_object->getId()<<std::endl;
2555                 else
2556                         infostream<<"ObjectRef destructing for id=unknown"<<std::endl;*/
2557         }
2558
2559         // Creates an ObjectRef and leaves it on top of stack
2560         // Not callable from Lua; all references are created on the C side.
2561         static void create(lua_State *L, ServerActiveObject *object)
2562         {
2563                 ObjectRef *o = new ObjectRef(object);
2564                 //infostream<<"ObjectRef::create: o="<<o<<std::endl;
2565                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2566                 luaL_getmetatable(L, className);
2567                 lua_setmetatable(L, -2);
2568         }
2569
2570         static void set_null(lua_State *L)
2571         {
2572                 ObjectRef *o = checkobject(L, -1);
2573                 o->m_object = NULL;
2574         }
2575
2576         static void Register(lua_State *L)
2577         {
2578                 lua_newtable(L);
2579                 int methodtable = lua_gettop(L);
2580                 luaL_newmetatable(L, className);
2581                 int metatable = lua_gettop(L);
2582
2583                 lua_pushliteral(L, "__metatable");
2584                 lua_pushvalue(L, methodtable);
2585                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2586
2587                 lua_pushliteral(L, "__index");
2588                 lua_pushvalue(L, methodtable);
2589                 lua_settable(L, metatable);
2590
2591                 lua_pushliteral(L, "__gc");
2592                 lua_pushcfunction(L, gc_object);
2593                 lua_settable(L, metatable);
2594
2595                 lua_pop(L, 1);  // drop metatable
2596
2597                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2598                 lua_pop(L, 1);  // drop methodtable
2599
2600                 // Cannot be created from Lua
2601                 //lua_register(L, className, create_object);
2602         }
2603 };
2604 const char ObjectRef::className[] = "ObjectRef";
2605 const luaL_reg ObjectRef::methods[] = {
2606         // ServerActiveObject
2607         method(ObjectRef, remove),
2608         method(ObjectRef, getpos),
2609         method(ObjectRef, setpos),
2610         method(ObjectRef, moveto),
2611         method(ObjectRef, punch),
2612         method(ObjectRef, right_click),
2613         method(ObjectRef, set_hp),
2614         method(ObjectRef, get_hp),
2615         method(ObjectRef, get_inventory),
2616         method(ObjectRef, get_wield_list),
2617         method(ObjectRef, get_wield_index),
2618         method(ObjectRef, get_wielded_item),
2619         method(ObjectRef, set_wielded_item),
2620         // LuaEntitySAO-only
2621         method(ObjectRef, setvelocity),
2622         method(ObjectRef, getvelocity),
2623         method(ObjectRef, setacceleration),
2624         method(ObjectRef, getacceleration),
2625         method(ObjectRef, setyaw),
2626         method(ObjectRef, getyaw),
2627         method(ObjectRef, settexturemod),
2628         method(ObjectRef, setsprite),
2629         method(ObjectRef, get_entity_name),
2630         method(ObjectRef, get_luaentity),
2631         // Player-only
2632         method(ObjectRef, get_player_name),
2633         method(ObjectRef, get_look_dir),
2634         method(ObjectRef, get_look_pitch),
2635         method(ObjectRef, get_look_yaw),
2636         {0,0}
2637 };
2638
2639 // Creates a new anonymous reference if id=0
2640 static void objectref_get_or_create(lua_State *L,
2641                 ServerActiveObject *cobj)
2642 {
2643         if(cobj->getId() == 0){
2644                 ObjectRef::create(L, cobj);
2645         } else {
2646                 objectref_get(L, cobj->getId());
2647         }
2648 }
2649
2650 /*
2651         EnvRef
2652 */
2653
2654 class EnvRef
2655 {
2656 private:
2657         ServerEnvironment *m_env;
2658
2659         static const char className[];
2660         static const luaL_reg methods[];
2661
2662         static EnvRef *checkobject(lua_State *L, int narg)
2663         {
2664                 luaL_checktype(L, narg, LUA_TUSERDATA);
2665                 void *ud = luaL_checkudata(L, narg, className);
2666                 if(!ud) luaL_typerror(L, narg, className);
2667                 return *(EnvRef**)ud;  // unbox pointer
2668         }
2669
2670         // Exported functions
2671
2672         // EnvRef:add_node(pos, node)
2673         // pos = {x=num, y=num, z=num}
2674         static int l_add_node(lua_State *L)
2675         {
2676                 //infostream<<"EnvRef::l_add_node()"<<std::endl;
2677                 EnvRef *o = checkobject(L, 1);
2678                 ServerEnvironment *env = o->m_env;
2679                 if(env == NULL) return 0;
2680                 // pos
2681                 v3s16 pos = read_v3s16(L, 2);
2682                 // content
2683                 MapNode n = readnode(L, 3, env->getGameDef()->ndef());
2684                 // Do it
2685                 bool succeeded = env->getMap().addNodeWithEvent(pos, n);
2686                 lua_pushboolean(L, succeeded);
2687                 return 1;
2688         }
2689
2690         // EnvRef:remove_node(pos)
2691         // pos = {x=num, y=num, z=num}
2692         static int l_remove_node(lua_State *L)
2693         {
2694                 //infostream<<"EnvRef::l_remove_node()"<<std::endl;
2695                 EnvRef *o = checkobject(L, 1);
2696                 ServerEnvironment *env = o->m_env;
2697                 if(env == NULL) return 0;
2698                 // pos
2699                 v3s16 pos = read_v3s16(L, 2);
2700                 // Do it
2701                 bool succeeded = env->getMap().removeNodeWithEvent(pos);
2702                 lua_pushboolean(L, succeeded);
2703                 return 1;
2704         }
2705
2706         // EnvRef:get_node(pos)
2707         // pos = {x=num, y=num, z=num}
2708         static int l_get_node(lua_State *L)
2709         {
2710                 //infostream<<"EnvRef::l_get_node()"<<std::endl;
2711                 EnvRef *o = checkobject(L, 1);
2712                 ServerEnvironment *env = o->m_env;
2713                 if(env == NULL) return 0;
2714                 // pos
2715                 v3s16 pos = read_v3s16(L, 2);
2716                 // Do it
2717                 MapNode n = env->getMap().getNodeNoEx(pos);
2718                 // Return node
2719                 pushnode(L, n, env->getGameDef()->ndef());
2720                 return 1;
2721         }
2722
2723         // EnvRef:get_node_or_nil(pos)
2724         // pos = {x=num, y=num, z=num}
2725         static int l_get_node_or_nil(lua_State *L)
2726         {
2727                 //infostream<<"EnvRef::l_get_node()"<<std::endl;
2728                 EnvRef *o = checkobject(L, 1);
2729                 ServerEnvironment *env = o->m_env;
2730                 if(env == NULL) return 0;
2731                 // pos
2732                 v3s16 pos = read_v3s16(L, 2);
2733                 // Do it
2734                 try{
2735                         MapNode n = env->getMap().getNode(pos);
2736                         // Return node
2737                         pushnode(L, n, env->getGameDef()->ndef());
2738                         return 1;
2739                 } catch(InvalidPositionException &e)
2740                 {
2741                         lua_pushnil(L);
2742                         return 1;
2743                 }
2744         }
2745
2746         // EnvRef:get_node_light(pos, timeofday)
2747         // pos = {x=num, y=num, z=num}
2748         // timeofday: nil = current time, 0 = night, 0.5 = day
2749         static int l_get_node_light(lua_State *L)
2750         {
2751                 EnvRef *o = checkobject(L, 1);
2752                 ServerEnvironment *env = o->m_env;
2753                 if(env == NULL) return 0;
2754                 // Do it
2755                 v3s16 pos = read_v3s16(L, 2);
2756                 u32 time_of_day = env->getTimeOfDay();
2757                 if(lua_isnumber(L, 3))
2758                         time_of_day = 24000.0 * lua_tonumber(L, 3);
2759                 time_of_day %= 24000;
2760                 u32 dnr = time_to_daynight_ratio(time_of_day);
2761                 MapNode n = env->getMap().getNodeNoEx(pos);
2762                 try{
2763                         MapNode n = env->getMap().getNode(pos);
2764                         INodeDefManager *ndef = env->getGameDef()->ndef();
2765                         lua_pushinteger(L, n.getLightBlend(dnr, ndef));
2766                         return 1;
2767                 } catch(InvalidPositionException &e)
2768                 {
2769                         lua_pushnil(L);
2770                         return 1;
2771                 }
2772         }
2773
2774         // EnvRef:add_entity(pos, entityname) -> ObjectRef or nil
2775         // pos = {x=num, y=num, z=num}
2776         static int l_add_entity(lua_State *L)
2777         {
2778                 //infostream<<"EnvRef::l_add_entity()"<<std::endl;
2779                 EnvRef *o = checkobject(L, 1);
2780                 ServerEnvironment *env = o->m_env;
2781                 if(env == NULL) return 0;
2782                 // pos
2783                 v3f pos = checkFloatPos(L, 2);
2784                 // content
2785                 const char *name = luaL_checkstring(L, 3);
2786                 // Do it
2787                 ServerActiveObject *obj = new LuaEntitySAO(env, pos, name, "");
2788                 int objectid = env->addActiveObject(obj);
2789                 // If failed to add, return nothing (reads as nil)
2790                 if(objectid == 0)
2791                         return 0;
2792                 // Return ObjectRef
2793                 objectref_get_or_create(L, obj);
2794                 return 1;
2795         }
2796
2797         // EnvRef:add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
2798         // pos = {x=num, y=num, z=num}
2799         static int l_add_item(lua_State *L)
2800         {
2801                 //infostream<<"EnvRef::l_add_item()"<<std::endl;
2802                 EnvRef *o = checkobject(L, 1);
2803                 ServerEnvironment *env = o->m_env;
2804                 if(env == NULL) return 0;
2805                 // pos
2806                 v3f pos = checkFloatPos(L, 2);
2807                 // item
2808                 ItemStack item = read_item(L, 3);
2809                 if(item.empty() || !item.isKnown(get_server(L)->idef()))
2810                         return 0;
2811                 // Do it
2812                 ServerActiveObject *obj = new ItemSAO(env, pos, item.getItemString());
2813                 int objectid = env->addActiveObject(obj);
2814                 // If failed to add, return nothing (reads as nil)
2815                 if(objectid == 0)
2816                         return 0;
2817                 // Return ObjectRef
2818                 objectref_get_or_create(L, obj);
2819                 return 1;
2820         }
2821
2822         // EnvRef:add_rat(pos)
2823         // pos = {x=num, y=num, z=num}
2824         static int l_add_rat(lua_State *L)
2825         {
2826                 infostream<<"EnvRef::l_add_rat()"<<std::endl;
2827                 EnvRef *o = checkobject(L, 1);
2828                 ServerEnvironment *env = o->m_env;
2829                 if(env == NULL) return 0;
2830                 // pos
2831                 v3f pos = checkFloatPos(L, 2);
2832                 // Do it
2833                 ServerActiveObject *obj = new RatSAO(env, pos);
2834                 env->addActiveObject(obj);
2835                 return 0;
2836         }
2837
2838         // EnvRef:add_firefly(pos)
2839         // pos = {x=num, y=num, z=num}
2840         static int l_add_firefly(lua_State *L)
2841         {
2842                 infostream<<"EnvRef::l_add_firefly()"<<std::endl;
2843                 EnvRef *o = checkobject(L, 1);
2844                 ServerEnvironment *env = o->m_env;
2845                 if(env == NULL) return 0;
2846                 // pos
2847                 v3f pos = checkFloatPos(L, 2);
2848                 // Do it
2849                 ServerActiveObject *obj = new FireflySAO(env, pos);
2850                 env->addActiveObject(obj);
2851                 return 0;
2852         }
2853
2854         // EnvRef:get_meta(pos)
2855         static int l_get_meta(lua_State *L)
2856         {
2857                 //infostream<<"EnvRef::l_get_meta()"<<std::endl;
2858                 EnvRef *o = checkobject(L, 1);
2859                 ServerEnvironment *env = o->m_env;
2860                 if(env == NULL) return 0;
2861                 // Do it
2862                 v3s16 p = read_v3s16(L, 2);
2863                 NodeMetaRef::create(L, p, env);
2864                 return 1;
2865         }
2866
2867         // EnvRef:get_player_by_name(name)
2868         static int l_get_player_by_name(lua_State *L)
2869         {
2870                 EnvRef *o = checkobject(L, 1);
2871                 ServerEnvironment *env = o->m_env;
2872                 if(env == NULL) return 0;
2873                 // Do it
2874                 const char *name = luaL_checkstring(L, 2);
2875                 ServerRemotePlayer *player =
2876                                 static_cast<ServerRemotePlayer*>(env->getPlayer(name));
2877                 if(player == NULL){
2878                         lua_pushnil(L);
2879                         return 1;
2880                 }
2881                 // Put player on stack
2882                 objectref_get_or_create(L, player);
2883                 return 1;
2884         }
2885
2886         // EnvRef:get_objects_inside_radius(pos, radius)
2887         static int l_get_objects_inside_radius(lua_State *L)
2888         {
2889                 // Get the table insert function
2890                 lua_getglobal(L, "table");
2891                 lua_getfield(L, -1, "insert");
2892                 int table_insert = lua_gettop(L);
2893                 // Get environemnt
2894                 EnvRef *o = checkobject(L, 1);
2895                 ServerEnvironment *env = o->m_env;
2896                 if(env == NULL) return 0;
2897                 // Do it
2898                 v3f pos = checkFloatPos(L, 2);
2899                 float radius = luaL_checknumber(L, 3) * BS;
2900                 std::set<u16> ids = env->getObjectsInsideRadius(pos, radius);
2901                 lua_newtable(L);
2902                 int table = lua_gettop(L);
2903                 for(std::set<u16>::const_iterator
2904                                 i = ids.begin(); i != ids.end(); i++){
2905                         ServerActiveObject *obj = env->getActiveObject(*i);
2906                         // Insert object reference into table
2907                         lua_pushvalue(L, table_insert);
2908                         lua_pushvalue(L, table);
2909                         objectref_get_or_create(L, obj);
2910                         if(lua_pcall(L, 2, 0, 0))
2911                                 script_error(L, "error: %s", lua_tostring(L, -1));
2912                 }
2913                 return 1;
2914         }
2915
2916         // EnvRef:set_timeofday(val)
2917         // val = 0...1
2918         static int l_set_timeofday(lua_State *L)
2919         {
2920                 EnvRef *o = checkobject(L, 1);
2921                 ServerEnvironment *env = o->m_env;
2922                 if(env == NULL) return 0;
2923                 // Do it
2924                 float timeofday_f = luaL_checknumber(L, 2);
2925                 assert(timeofday_f >= 0.0 && timeofday_f <= 1.0);
2926                 int timeofday_mh = (int)(timeofday_f * 24000.0);
2927                 // This should be set directly in the environment but currently
2928                 // such changes aren't immediately sent to the clients, so call
2929                 // the server instead.
2930                 //env->setTimeOfDay(timeofday_mh);
2931                 get_server(L)->setTimeOfDay(timeofday_mh);
2932                 return 0;
2933         }
2934
2935         // EnvRef:get_timeofday() -> 0...1
2936         static int l_get_timeofday(lua_State *L)
2937         {
2938                 EnvRef *o = checkobject(L, 1);
2939                 ServerEnvironment *env = o->m_env;
2940                 if(env == NULL) return 0;
2941                 // Do it
2942                 int timeofday_mh = env->getTimeOfDay();
2943                 float timeofday_f = (float)timeofday_mh / 24000.0;
2944                 lua_pushnumber(L, timeofday_f);
2945                 return 1;
2946         }
2947
2948         static int gc_object(lua_State *L) {
2949                 EnvRef *o = *(EnvRef **)(lua_touserdata(L, 1));
2950                 delete o;
2951                 return 0;
2952         }
2953
2954 public:
2955         EnvRef(ServerEnvironment *env):
2956                 m_env(env)
2957         {
2958                 infostream<<"EnvRef created"<<std::endl;
2959         }
2960
2961         ~EnvRef()
2962         {
2963                 infostream<<"EnvRef destructing"<<std::endl;
2964         }
2965
2966         // Creates an EnvRef and leaves it on top of stack
2967         // Not callable from Lua; all references are created on the C side.
2968         static void create(lua_State *L, ServerEnvironment *env)
2969         {
2970                 EnvRef *o = new EnvRef(env);
2971                 //infostream<<"EnvRef::create: o="<<o<<std::endl;
2972                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2973                 luaL_getmetatable(L, className);
2974                 lua_setmetatable(L, -2);
2975         }
2976
2977         static void set_null(lua_State *L)
2978         {
2979                 EnvRef *o = checkobject(L, -1);
2980                 o->m_env = NULL;
2981         }
2982
2983         static void Register(lua_State *L)
2984         {
2985                 lua_newtable(L);
2986                 int methodtable = lua_gettop(L);
2987                 luaL_newmetatable(L, className);
2988                 int metatable = lua_gettop(L);
2989
2990                 lua_pushliteral(L, "__metatable");
2991                 lua_pushvalue(L, methodtable);
2992                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2993
2994                 lua_pushliteral(L, "__index");
2995                 lua_pushvalue(L, methodtable);
2996                 lua_settable(L, metatable);
2997
2998                 lua_pushliteral(L, "__gc");
2999                 lua_pushcfunction(L, gc_object);
3000                 lua_settable(L, metatable);
3001
3002                 lua_pop(L, 1);  // drop metatable
3003
3004                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3005                 lua_pop(L, 1);  // drop methodtable
3006
3007                 // Cannot be created from Lua
3008                 //lua_register(L, className, create_object);
3009         }
3010 };
3011 const char EnvRef::className[] = "EnvRef";
3012 const luaL_reg EnvRef::methods[] = {
3013         method(EnvRef, add_node),
3014         method(EnvRef, remove_node),
3015         method(EnvRef, get_node),
3016         method(EnvRef, get_node_or_nil),
3017         method(EnvRef, get_node_light),
3018         method(EnvRef, add_entity),
3019         method(EnvRef, add_item),
3020         method(EnvRef, add_rat),
3021         method(EnvRef, add_firefly),
3022         method(EnvRef, get_meta),
3023         method(EnvRef, get_player_by_name),
3024         method(EnvRef, get_objects_inside_radius),
3025         method(EnvRef, set_timeofday),
3026         method(EnvRef, get_timeofday),
3027         {0,0}
3028 };
3029
3030 /*
3031         Global functions
3032 */
3033
3034 class LuaABM : public ActiveBlockModifier
3035 {
3036 private:
3037         lua_State *m_lua;
3038         int m_id;
3039
3040         std::set<std::string> m_trigger_contents;
3041         std::set<std::string> m_required_neighbors;
3042         float m_trigger_interval;
3043         u32 m_trigger_chance;
3044 public:
3045         LuaABM(lua_State *L, int id,
3046                         const std::set<std::string> &trigger_contents,
3047                         const std::set<std::string> &required_neighbors,
3048                         float trigger_interval, u32 trigger_chance):
3049                 m_lua(L),
3050                 m_id(id),
3051                 m_trigger_contents(trigger_contents),
3052                 m_required_neighbors(required_neighbors),
3053                 m_trigger_interval(trigger_interval),
3054                 m_trigger_chance(trigger_chance)
3055         {
3056         }
3057         virtual std::set<std::string> getTriggerContents()
3058         {
3059                 return m_trigger_contents;
3060         }
3061         virtual std::set<std::string> getRequiredNeighbors()
3062         {
3063                 return m_required_neighbors;
3064         }
3065         virtual float getTriggerInterval()
3066         {
3067                 return m_trigger_interval;
3068         }
3069         virtual u32 getTriggerChance()
3070         {
3071                 return m_trigger_chance;
3072         }
3073         virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n,
3074                         u32 active_object_count, u32 active_object_count_wider)
3075         {
3076                 lua_State *L = m_lua;
3077
3078                 realitycheck(L);
3079                 assert(lua_checkstack(L, 20));
3080                 StackUnroller stack_unroller(L);
3081
3082                 // Get minetest.registered_abms
3083                 lua_getglobal(L, "minetest");
3084                 lua_getfield(L, -1, "registered_abms");
3085                 luaL_checktype(L, -1, LUA_TTABLE);
3086                 int registered_abms = lua_gettop(L);
3087
3088                 // Get minetest.registered_abms[m_id]
3089                 lua_pushnumber(L, m_id);
3090                 lua_gettable(L, registered_abms);
3091                 if(lua_isnil(L, -1))
3092                         assert(0);
3093
3094                 // Call action
3095                 luaL_checktype(L, -1, LUA_TTABLE);
3096                 lua_getfield(L, -1, "action");
3097                 luaL_checktype(L, -1, LUA_TFUNCTION);
3098                 push_v3s16(L, p);
3099                 pushnode(L, n, env->getGameDef()->ndef());
3100                 lua_pushnumber(L, active_object_count);
3101                 lua_pushnumber(L, active_object_count_wider);
3102                 if(lua_pcall(L, 4, 0, 0))
3103                         script_error(L, "error: %s", lua_tostring(L, -1));
3104         }
3105 };
3106
3107 // debug(text)
3108 // Writes a line to dstream
3109 static int l_debug(lua_State *L)
3110 {
3111         std::string text = lua_tostring(L, 1);
3112         dstream << text << std::endl;
3113         return 0;
3114 }
3115
3116 // log([level,] text)
3117 // Writes a line to the logger.
3118 // The one-argument version logs to infostream.
3119 // The two-argument version accept a log level: error, action, info, or verbose.
3120 static int l_log(lua_State *L)
3121 {
3122         std::string text;
3123         LogMessageLevel level = LMT_INFO;
3124         if(lua_isnone(L, 2))
3125         {
3126                 text = lua_tostring(L, 1);
3127         }
3128         else
3129         {
3130                 std::string levelname = lua_tostring(L, 1);
3131                 text = lua_tostring(L, 2);
3132                 if(levelname == "error")
3133                         level = LMT_ERROR;
3134                 else if(levelname == "action")
3135                         level = LMT_ACTION;
3136                 else if(levelname == "verbose")
3137                         level = LMT_VERBOSE;
3138         }
3139         log_printline(level, text);
3140         return 0;
3141 }
3142
3143 // register_item_raw({lots of stuff})
3144 static int l_register_item_raw(lua_State *L)
3145 {
3146         luaL_checktype(L, 1, LUA_TTABLE);
3147         int table = 1;
3148
3149         // Get the writable item and node definition managers from the server
3150         IWritableItemDefManager *idef =
3151                         get_server(L)->getWritableItemDefManager();
3152         IWritableNodeDefManager *ndef =
3153                         get_server(L)->getWritableNodeDefManager();
3154
3155         // Check if name is defined
3156         lua_getfield(L, table, "name");
3157         if(lua_isstring(L, -1)){
3158                 std::string name = lua_tostring(L, -1);
3159                 infostream<<"register_item_raw: "<<name<<std::endl;
3160         } else {
3161                 throw LuaError(L, "register_item_raw: name is not defined or not a string");
3162         }
3163
3164         // Check if on_use is defined
3165
3166         // Read the item definition and register it
3167         ItemDefinition def = read_item_definition(L, table);
3168         idef->registerItem(def);
3169
3170         // Read the node definition (content features) and register it
3171         if(def.type == ITEM_NODE)
3172         {
3173                 ContentFeatures f = read_content_features(L, table);
3174                 ndef->set(f.name, f);
3175         }
3176
3177         return 0; /* number of results */
3178 }
3179
3180 // register_alias_raw(name, convert_to_name)
3181 static int l_register_alias_raw(lua_State *L)
3182 {
3183         std::string name = luaL_checkstring(L, 1);
3184         std::string convert_to = luaL_checkstring(L, 2);
3185
3186         // Get the writable item definition manager from the server
3187         IWritableItemDefManager *idef =
3188                         get_server(L)->getWritableItemDefManager();
3189
3190         idef->registerAlias(name, convert_to);
3191
3192         return 0; /* number of results */
3193 }
3194
3195 // helper for register_craft
3196 static bool read_craft_recipe_shaped(lua_State *L, int index,
3197                 int &width, std::vector<std::string> &recipe)
3198 {
3199         if(index < 0)
3200                 index = lua_gettop(L) + 1 + index;
3201
3202         if(!lua_istable(L, index))
3203                 return false;
3204
3205         lua_pushnil(L);
3206         int rowcount = 0;
3207         while(lua_next(L, index) != 0){
3208                 int colcount = 0;
3209                 // key at index -2 and value at index -1
3210                 if(!lua_istable(L, -1))
3211                         return false;
3212                 int table2 = lua_gettop(L);
3213                 lua_pushnil(L);
3214                 while(lua_next(L, table2) != 0){
3215                         // key at index -2 and value at index -1
3216                         if(!lua_isstring(L, -1))
3217                                 return false;
3218                         recipe.push_back(lua_tostring(L, -1));
3219                         // removes value, keeps key for next iteration
3220                         lua_pop(L, 1);
3221                         colcount++;
3222                 }
3223                 if(rowcount == 0){
3224                         width = colcount;
3225                 } else {
3226                         if(colcount != width)
3227                                 return false;
3228                 }
3229                 // removes value, keeps key for next iteration
3230                 lua_pop(L, 1);
3231                 rowcount++;
3232         }
3233         return width != 0;
3234 }
3235
3236 // helper for register_craft
3237 static bool read_craft_recipe_shapeless(lua_State *L, int index,
3238                 std::vector<std::string> &recipe)
3239 {
3240         if(index < 0)
3241                 index = lua_gettop(L) + 1 + index;
3242
3243         if(!lua_istable(L, index))
3244                 return false;
3245
3246         lua_pushnil(L);
3247         while(lua_next(L, index) != 0){
3248                 // key at index -2 and value at index -1
3249                 if(!lua_isstring(L, -1))
3250                         return false;
3251                 recipe.push_back(lua_tostring(L, -1));
3252                 // removes value, keeps key for next iteration
3253                 lua_pop(L, 1);
3254         }
3255         return true;
3256 }
3257
3258 // helper for register_craft
3259 static bool read_craft_replacements(lua_State *L, int index,
3260                 CraftReplacements &replacements)
3261 {
3262         if(index < 0)
3263                 index = lua_gettop(L) + 1 + index;
3264
3265         if(!lua_istable(L, index))
3266                 return false;
3267
3268         lua_pushnil(L);
3269         while(lua_next(L, index) != 0){
3270                 // key at index -2 and value at index -1
3271                 if(!lua_istable(L, -1))
3272                         return false;
3273                 lua_rawgeti(L, -1, 1);
3274                 if(!lua_isstring(L, -1))
3275                         return false;
3276                 std::string replace_from = lua_tostring(L, -1);
3277                 lua_pop(L, 1);
3278                 lua_rawgeti(L, -1, 2);
3279                 if(!lua_isstring(L, -1))
3280                         return false;
3281                 std::string replace_to = lua_tostring(L, -1);
3282                 lua_pop(L, 1);
3283                 replacements.pairs.push_back(
3284                                 std::make_pair(replace_from, replace_to));
3285                 // removes value, keeps key for next iteration
3286                 lua_pop(L, 1);
3287         }
3288         return true;
3289 }
3290 // register_craft({output=item, recipe={{item00,item10},{item01,item11}})
3291 static int l_register_craft(lua_State *L)
3292 {
3293         //infostream<<"register_craft"<<std::endl;
3294         luaL_checktype(L, 1, LUA_TTABLE);
3295         int table = 1;
3296
3297         // Get the writable craft definition manager from the server
3298         IWritableCraftDefManager *craftdef =
3299                         get_server(L)->getWritableCraftDefManager();
3300
3301         std::string type = getstringfield_default(L, table, "type", "shaped");
3302
3303         /*
3304                 CraftDefinitionShaped
3305         */
3306         if(type == "shaped"){
3307                 std::string output = getstringfield_default(L, table, "output", "");
3308                 if(output == "")
3309                         throw LuaError(L, "Crafting definition is missing an output");
3310
3311                 int width = 0;
3312                 std::vector<std::string> recipe;
3313                 lua_getfield(L, table, "recipe");
3314                 if(lua_isnil(L, -1))
3315                         throw LuaError(L, "Crafting definition is missing a recipe"
3316                                         " (output=\"" + output + "\")");
3317                 if(!read_craft_recipe_shaped(L, -1, width, recipe))
3318                         throw LuaError(L, "Invalid crafting recipe"
3319                                         " (output=\"" + output + "\")");
3320
3321                 CraftReplacements replacements;
3322                 lua_getfield(L, table, "replacements");
3323                 if(!lua_isnil(L, -1))
3324                 {
3325                         if(!read_craft_replacements(L, -1, replacements))
3326                                 throw LuaError(L, "Invalid replacements"
3327                                                 " (output=\"" + output + "\")");
3328                 }
3329
3330                 CraftDefinition *def = new CraftDefinitionShaped(
3331                                 output, width, recipe, replacements);
3332                 craftdef->registerCraft(def);
3333         }
3334         /*
3335                 CraftDefinitionShapeless
3336         */
3337         else if(type == "shapeless"){
3338                 std::string output = getstringfield_default(L, table, "output", "");
3339                 if(output == "")
3340                         throw LuaError(L, "Crafting definition (shapeless)"
3341                                         " is missing an output");
3342
3343                 std::vector<std::string> recipe;
3344                 lua_getfield(L, table, "recipe");
3345                 if(lua_isnil(L, -1))
3346                         throw LuaError(L, "Crafting definition (shapeless)"
3347                                         " is missing a recipe"
3348                                         " (output=\"" + output + "\")");
3349                 if(!read_craft_recipe_shapeless(L, -1, recipe))
3350                         throw LuaError(L, "Invalid crafting recipe"
3351                                         " (output=\"" + output + "\")");
3352
3353                 CraftReplacements replacements;
3354                 lua_getfield(L, table, "replacements");
3355                 if(!lua_isnil(L, -1))
3356                 {
3357                         if(!read_craft_replacements(L, -1, replacements))
3358                                 throw LuaError(L, "Invalid replacements"
3359                                                 " (output=\"" + output + "\")");
3360                 }
3361
3362                 CraftDefinition *def = new CraftDefinitionShapeless(
3363                                 output, recipe, replacements);
3364                 craftdef->registerCraft(def);
3365         }
3366         /*
3367                 CraftDefinitionToolRepair
3368         */
3369         else if(type == "toolrepair"){
3370                 float additional_wear = getfloatfield_default(L, table,
3371                                 "additional_wear", 0.0);
3372
3373                 CraftDefinition *def = new CraftDefinitionToolRepair(
3374                                 additional_wear);
3375                 craftdef->registerCraft(def);
3376         }
3377         /*
3378                 CraftDefinitionCooking
3379         */
3380         else if(type == "cooking"){
3381                 std::string output = getstringfield_default(L, table, "output", "");
3382                 if(output == "")
3383                         throw LuaError(L, "Crafting definition (cooking)"
3384                                         " is missing an output");
3385
3386                 std::string recipe = getstringfield_default(L, table, "recipe", "");
3387                 if(recipe == "")
3388                         throw LuaError(L, "Crafting definition (cooking)"
3389                                         " is missing a recipe"
3390                                         " (output=\"" + output + "\")");
3391
3392                 float cooktime = getfloatfield_default(L, table, "cooktime", 3.0);
3393
3394                 CraftDefinition *def = new CraftDefinitionCooking(
3395                                 output, recipe, cooktime);
3396                 craftdef->registerCraft(def);
3397         }
3398         /*
3399                 CraftDefinitionFuel
3400         */
3401         else if(type == "fuel"){
3402                 std::string recipe = getstringfield_default(L, table, "recipe", "");
3403                 if(recipe == "")
3404                         throw LuaError(L, "Crafting definition (fuel)"
3405                                         " is missing a recipe");
3406
3407                 float burntime = getfloatfield_default(L, table, "burntime", 1.0);
3408
3409                 CraftDefinition *def = new CraftDefinitionFuel(
3410                                 recipe, burntime);
3411                 craftdef->registerCraft(def);
3412         }
3413         else
3414         {
3415                 throw LuaError(L, "Unknown crafting definition type: \"" + type + "\"");
3416         }
3417
3418         lua_pop(L, 1);
3419         return 0; /* number of results */
3420 }
3421
3422 // setting_get(name)
3423 static int l_setting_get(lua_State *L)
3424 {
3425         const char *name = luaL_checkstring(L, 1);
3426         try{
3427                 std::string value = g_settings->get(name);
3428                 lua_pushstring(L, value.c_str());
3429         } catch(SettingNotFoundException &e){
3430                 lua_pushnil(L);
3431         }
3432         return 1;
3433 }
3434
3435 // setting_getbool(name)
3436 static int l_setting_getbool(lua_State *L)
3437 {
3438         const char *name = luaL_checkstring(L, 1);
3439         try{
3440                 bool value = g_settings->getBool(name);
3441                 lua_pushboolean(L, value);
3442         } catch(SettingNotFoundException &e){
3443                 lua_pushnil(L);
3444         }
3445         return 1;
3446 }
3447
3448 // chat_send_all(text)
3449 static int l_chat_send_all(lua_State *L)
3450 {
3451         const char *text = luaL_checkstring(L, 1);
3452         // Get server from registry
3453         Server *server = get_server(L);
3454         // Send
3455         server->notifyPlayers(narrow_to_wide(text));
3456         return 0;
3457 }
3458
3459 // chat_send_player(name, text)
3460 static int l_chat_send_player(lua_State *L)
3461 {
3462         const char *name = luaL_checkstring(L, 1);
3463         const char *text = luaL_checkstring(L, 2);
3464         // Get server from registry
3465         Server *server = get_server(L);
3466         // Send
3467         server->notifyPlayer(name, narrow_to_wide(text));
3468         return 0;
3469 }
3470
3471 // get_player_privs(name, text)
3472 static int l_get_player_privs(lua_State *L)
3473 {
3474         const char *name = luaL_checkstring(L, 1);
3475         // Get server from registry
3476         Server *server = get_server(L);
3477         // Do it
3478         lua_newtable(L);
3479         int table = lua_gettop(L);
3480         u64 privs_i = server->getPlayerAuthPrivs(name);
3481         // Special case for the "name" setting (local player / server owner)
3482         if(name == g_settings->get("name"))
3483                 privs_i = PRIV_ALL;
3484         std::set<std::string> privs_s = privsToSet(privs_i);
3485         for(std::set<std::string>::const_iterator
3486                         i = privs_s.begin(); i != privs_s.end(); i++){
3487                 lua_pushboolean(L, true);
3488                 lua_setfield(L, table, i->c_str());
3489         }
3490         lua_pushvalue(L, table);
3491         return 1;
3492 }
3493
3494 // get_inventory(location)
3495 static int l_get_inventory(lua_State *L)
3496 {
3497         InventoryLocation loc;
3498
3499         std::string type = checkstringfield(L, 1, "type");
3500         if(type == "player"){
3501                 std::string name = checkstringfield(L, 1, "name");
3502                 loc.setPlayer(name);
3503         } else if(type == "node"){
3504                 lua_getfield(L, 1, "pos");
3505                 v3s16 pos = check_v3s16(L, -1);
3506                 loc.setNodeMeta(pos);
3507         }
3508
3509         if(get_server(L)->getInventory(loc) != NULL)
3510                 InvRef::create(L, loc);
3511         else
3512                 lua_pushnil(L);
3513         return 1;
3514 }
3515
3516 // get_digging_properties(material_properties, tool_digging_properties[, time_from_last_punch])
3517 static int l_get_digging_properties(lua_State *L)
3518 {
3519         MaterialProperties mp = read_material_properties(L, 1);
3520         ToolDiggingProperties tp = read_tool_digging_properties(L, 2);
3521         if(lua_isnoneornil(L, 3))
3522                 push_digging_properties(L, getDiggingProperties(&mp, &tp));
3523         else
3524                 push_digging_properties(L, getDiggingProperties(&mp, &tp,
3525                                         luaL_checknumber(L, 3)));
3526         return 1;
3527 }
3528
3529 // get_hitting_properties(material_properties, tool_digging_properties[, time_from_last_punch])
3530 static int l_get_hitting_properties(lua_State *L)
3531 {
3532         MaterialProperties mp = read_material_properties(L, 1);
3533         ToolDiggingProperties tp = read_tool_digging_properties(L, 2);
3534         if(lua_isnoneornil(L, 3))
3535                 push_hitting_properties(L, getHittingProperties(&mp, &tp));
3536         else
3537                 push_hitting_properties(L, getHittingProperties(&mp, &tp,
3538                                         luaL_checknumber(L, 3)));
3539         return 1;
3540 }
3541
3542 // get_current_modname()
3543 static int l_get_current_modname(lua_State *L)
3544 {
3545         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
3546         return 1;
3547 }
3548
3549 // get_modpath(modname)
3550 static int l_get_modpath(lua_State *L)
3551 {
3552         const char *modname = luaL_checkstring(L, 1);
3553         // Do it
3554         const ModSpec *mod = get_server(L)->getModSpec(modname);
3555         if(!mod){
3556                 lua_pushnil(L);
3557                 return 1;
3558         }
3559         lua_pushstring(L, mod->path.c_str());
3560         return 1;
3561 }
3562
3563 // get_worldpath()
3564 static int l_get_worldpath(lua_State *L)
3565 {
3566         std::string worldpath = get_server(L)->getWorldPath();
3567         lua_pushstring(L, worldpath.c_str());
3568         return 1;
3569 }
3570
3571 static const struct luaL_Reg minetest_f [] = {
3572         {"debug", l_debug},
3573         {"log", l_log},
3574         {"register_item_raw", l_register_item_raw},
3575         {"register_alias_raw", l_register_alias_raw},
3576         {"register_craft", l_register_craft},
3577         {"setting_get", l_setting_get},
3578         {"setting_getbool", l_setting_getbool},
3579         {"chat_send_all", l_chat_send_all},
3580         {"chat_send_player", l_chat_send_player},
3581         {"get_player_privs", l_get_player_privs},
3582         {"get_inventory", l_get_inventory},
3583         {"get_digging_properties", l_get_digging_properties},
3584         {"get_hitting_properties", l_get_hitting_properties},
3585         {"get_current_modname", l_get_current_modname},
3586         {"get_modpath", l_get_modpath},
3587         {"get_worldpath", l_get_worldpath},
3588         {NULL, NULL}
3589 };
3590
3591 /*
3592         Main export function
3593 */
3594
3595 void scriptapi_export(lua_State *L, Server *server)
3596 {
3597         realitycheck(L);
3598         assert(lua_checkstack(L, 20));
3599         infostream<<"scriptapi_export"<<std::endl;
3600         StackUnroller stack_unroller(L);
3601
3602         // Store server as light userdata in registry
3603         lua_pushlightuserdata(L, server);
3604         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_server");
3605
3606         // Register global functions in table minetest
3607         lua_newtable(L);
3608         luaL_register(L, NULL, minetest_f);
3609         lua_setglobal(L, "minetest");
3610
3611         // Get the main minetest table
3612         lua_getglobal(L, "minetest");
3613
3614         // Add tables to minetest
3615
3616         lua_newtable(L);
3617         lua_setfield(L, -2, "object_refs");
3618         lua_newtable(L);
3619         lua_setfield(L, -2, "luaentities");
3620
3621         // Register wrappers
3622         LuaItemStack::Register(L);
3623         InvRef::Register(L);
3624         NodeMetaRef::Register(L);
3625         ObjectRef::Register(L);
3626         EnvRef::Register(L);
3627 }
3628
3629 bool scriptapi_loadmod(lua_State *L, const std::string &scriptpath,
3630                 const std::string &modname)
3631 {
3632         ModNameStorer modnamestorer(L, modname);
3633
3634         if(!string_allowed(modname, "abcdefghijklmnopqrstuvwxyz"
3635                         "0123456789_")){
3636                 errorstream<<"Error loading mod \""<<modname
3637                                 <<"\": modname does not follow naming conventions: "
3638                                 <<"Only chararacters [a-z0-9_] are allowed."<<std::endl;
3639                 return false;
3640         }
3641
3642         bool success = false;
3643
3644         try{
3645                 success = script_load(L, scriptpath.c_str());
3646         }
3647         catch(LuaError &e){
3648                 errorstream<<"Error loading mod \""<<modname
3649                                 <<"\": "<<e.what()<<std::endl;
3650         }
3651
3652         return success;
3653 }
3654
3655 void scriptapi_add_environment(lua_State *L, ServerEnvironment *env)
3656 {
3657         realitycheck(L);
3658         assert(lua_checkstack(L, 20));
3659         infostream<<"scriptapi_add_environment"<<std::endl;
3660         StackUnroller stack_unroller(L);
3661
3662         // Create EnvRef on stack
3663         EnvRef::create(L, env);
3664         int envref = lua_gettop(L);
3665
3666         // minetest.env = envref
3667         lua_getglobal(L, "minetest");
3668         luaL_checktype(L, -1, LUA_TTABLE);
3669         lua_pushvalue(L, envref);
3670         lua_setfield(L, -2, "env");
3671
3672         // Store environment as light userdata in registry
3673         lua_pushlightuserdata(L, env);
3674         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_env");
3675
3676         /*
3677                 Add ActiveBlockModifiers to environment
3678         */
3679
3680         // Get minetest.registered_abms
3681         lua_getglobal(L, "minetest");
3682         lua_getfield(L, -1, "registered_abms");
3683         luaL_checktype(L, -1, LUA_TTABLE);
3684         int registered_abms = lua_gettop(L);
3685
3686         if(lua_istable(L, registered_abms)){
3687                 int table = lua_gettop(L);
3688                 lua_pushnil(L);
3689                 while(lua_next(L, table) != 0){
3690                         // key at index -2 and value at index -1
3691                         int id = lua_tonumber(L, -2);
3692                         int current_abm = lua_gettop(L);
3693
3694                         std::set<std::string> trigger_contents;
3695                         lua_getfield(L, current_abm, "nodenames");
3696                         if(lua_istable(L, -1)){
3697                                 int table = lua_gettop(L);
3698                                 lua_pushnil(L);
3699                                 while(lua_next(L, table) != 0){
3700                                         // key at index -2 and value at index -1
3701                                         luaL_checktype(L, -1, LUA_TSTRING);
3702                                         trigger_contents.insert(lua_tostring(L, -1));
3703                                         // removes value, keeps key for next iteration
3704                                         lua_pop(L, 1);
3705                                 }
3706                         } else if(lua_isstring(L, -1)){
3707                                 trigger_contents.insert(lua_tostring(L, -1));
3708                         }
3709                         lua_pop(L, 1);
3710
3711                         std::set<std::string> required_neighbors;
3712                         lua_getfield(L, current_abm, "neighbors");
3713                         if(lua_istable(L, -1)){
3714                                 int table = lua_gettop(L);
3715                                 lua_pushnil(L);
3716                                 while(lua_next(L, table) != 0){
3717                                         // key at index -2 and value at index -1
3718                                         luaL_checktype(L, -1, LUA_TSTRING);
3719                                         required_neighbors.insert(lua_tostring(L, -1));
3720                                         // removes value, keeps key for next iteration
3721                                         lua_pop(L, 1);
3722                                 }
3723                         } else if(lua_isstring(L, -1)){
3724                                 required_neighbors.insert(lua_tostring(L, -1));
3725                         }
3726                         lua_pop(L, 1);
3727
3728                         float trigger_interval = 10.0;
3729                         getfloatfield(L, current_abm, "interval", trigger_interval);
3730
3731                         int trigger_chance = 50;
3732                         getintfield(L, current_abm, "chance", trigger_chance);
3733
3734                         LuaABM *abm = new LuaABM(L, id, trigger_contents,
3735                                         required_neighbors, trigger_interval, trigger_chance);
3736
3737                         env->addActiveBlockModifier(abm);
3738
3739                         // removes value, keeps key for next iteration
3740                         lua_pop(L, 1);
3741                 }
3742         }
3743         lua_pop(L, 1);
3744 }
3745
3746 #if 0
3747 // Dump stack top with the dump2 function
3748 static void dump2(lua_State *L, const char *name)
3749 {
3750         // Dump object (debug)
3751         lua_getglobal(L, "dump2");
3752         luaL_checktype(L, -1, LUA_TFUNCTION);
3753         lua_pushvalue(L, -2); // Get previous stack top as first parameter
3754         lua_pushstring(L, name);
3755         if(lua_pcall(L, 2, 0, 0))
3756                 script_error(L, "error: %s", lua_tostring(L, -1));
3757 }
3758 #endif
3759
3760 /*
3761         object_reference
3762 */
3763
3764 void scriptapi_add_object_reference(lua_State *L, ServerActiveObject *cobj)
3765 {
3766         realitycheck(L);
3767         assert(lua_checkstack(L, 20));
3768         //infostream<<"scriptapi_add_object_reference: id="<<cobj->getId()<<std::endl;
3769         StackUnroller stack_unroller(L);
3770
3771         // Create object on stack
3772         ObjectRef::create(L, cobj); // Puts ObjectRef (as userdata) on stack
3773         int object = lua_gettop(L);
3774
3775         // Get minetest.object_refs table
3776         lua_getglobal(L, "minetest");
3777         lua_getfield(L, -1, "object_refs");
3778         luaL_checktype(L, -1, LUA_TTABLE);
3779         int objectstable = lua_gettop(L);
3780
3781         // object_refs[id] = object
3782         lua_pushnumber(L, cobj->getId()); // Push id
3783         lua_pushvalue(L, object); // Copy object to top of stack
3784         lua_settable(L, objectstable);
3785 }
3786
3787 void scriptapi_rm_object_reference(lua_State *L, ServerActiveObject *cobj)
3788 {
3789         realitycheck(L);
3790         assert(lua_checkstack(L, 20));
3791         //infostream<<"scriptapi_rm_object_reference: id="<<cobj->getId()<<std::endl;
3792         StackUnroller stack_unroller(L);
3793
3794         // Get minetest.object_refs table
3795         lua_getglobal(L, "minetest");
3796         lua_getfield(L, -1, "object_refs");
3797         luaL_checktype(L, -1, LUA_TTABLE);
3798         int objectstable = lua_gettop(L);
3799
3800         // Get object_refs[id]
3801         lua_pushnumber(L, cobj->getId()); // Push id
3802         lua_gettable(L, objectstable);
3803         // Set object reference to NULL
3804         ObjectRef::set_null(L);
3805         lua_pop(L, 1); // pop object
3806
3807         // Set object_refs[id] = nil
3808         lua_pushnumber(L, cobj->getId()); // Push id
3809         lua_pushnil(L);
3810         lua_settable(L, objectstable);
3811 }
3812
3813 bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
3814                 const std::string &message)
3815 {
3816         realitycheck(L);
3817         assert(lua_checkstack(L, 20));
3818         StackUnroller stack_unroller(L);
3819
3820         // Get minetest.registered_on_chat_messages
3821         lua_getglobal(L, "minetest");
3822         lua_getfield(L, -1, "registered_on_chat_messages");
3823         luaL_checktype(L, -1, LUA_TTABLE);
3824         int table = lua_gettop(L);
3825         // Foreach
3826         lua_pushnil(L);
3827         while(lua_next(L, table) != 0){
3828                 // key at index -2 and value at index -1
3829                 luaL_checktype(L, -1, LUA_TFUNCTION);
3830                 // Call function
3831                 lua_pushstring(L, name.c_str());
3832                 lua_pushstring(L, message.c_str());
3833                 if(lua_pcall(L, 2, 1, 0))
3834                         script_error(L, "error: %s", lua_tostring(L, -1));
3835                 bool ate = lua_toboolean(L, -1);
3836                 lua_pop(L, 1);
3837                 if(ate)
3838                         return true;
3839                 // value removed, keep key for next iteration
3840         }
3841         return false;
3842 }
3843
3844 /*
3845         misc
3846 */
3847
3848 void scriptapi_on_newplayer(lua_State *L, ServerActiveObject *player)
3849 {
3850         realitycheck(L);
3851         assert(lua_checkstack(L, 20));
3852         StackUnroller stack_unroller(L);
3853
3854         // Get minetest.registered_on_newplayers
3855         lua_getglobal(L, "minetest");
3856         lua_getfield(L, -1, "registered_on_newplayers");
3857         luaL_checktype(L, -1, LUA_TTABLE);
3858         int table = lua_gettop(L);
3859         // Foreach
3860         lua_pushnil(L);
3861         while(lua_next(L, table) != 0){
3862                 // key at index -2 and value at index -1
3863                 luaL_checktype(L, -1, LUA_TFUNCTION);
3864                 // Call function
3865                 objectref_get_or_create(L, player);
3866                 if(lua_pcall(L, 1, 0, 0))
3867                         script_error(L, "error: %s", lua_tostring(L, -1));
3868                 // value removed, keep key for next iteration
3869         }
3870 }
3871
3872 void scriptapi_on_dieplayer(lua_State *L, ServerActiveObject *player)
3873 {
3874     realitycheck(L);
3875     assert(lua_checkstack(L, 20));
3876     StackUnroller stack_unroller(L);
3877
3878     // Get minetest.registered_on_dieplayers
3879     lua_getglobal(L, "minetest");
3880     lua_getfield(L, -1, "registered_on_dieplayers");
3881     luaL_checktype(L, -1, LUA_TTABLE);
3882     int table = lua_gettop(L);
3883     // Foreach
3884     lua_pushnil(L);
3885     while(lua_next(L, table) != 0){
3886         // key at index -2 and value at index -1
3887        luaL_checktype(L, -1, LUA_TFUNCTION);
3888         // Call function
3889        objectref_get_or_create(L, player);
3890         if(lua_pcall(L, 1, 0, 0))
3891             script_error(L, "error: %s", lua_tostring(L, -1));
3892         // value removed, keep key for next iteration
3893     }
3894 }
3895
3896
3897 bool scriptapi_on_respawnplayer(lua_State *L, ServerActiveObject *player)
3898 {
3899         realitycheck(L);
3900         assert(lua_checkstack(L, 20));
3901         StackUnroller stack_unroller(L);
3902
3903         dstream<<"player: "<<player<<"   id: "<<player->getId()<<std::endl;
3904
3905         bool positioning_handled_by_some = false;
3906
3907         // Get minetest.registered_on_respawnplayers
3908         lua_getglobal(L, "minetest");
3909         lua_getfield(L, -1, "registered_on_respawnplayers");
3910         luaL_checktype(L, -1, LUA_TTABLE);
3911         int table = lua_gettop(L);
3912         // Foreach
3913         lua_pushnil(L);
3914         while(lua_next(L, table) != 0){
3915                 // key at index -2 and value at index -1
3916                 luaL_checktype(L, -1, LUA_TFUNCTION);
3917                 // Call function
3918                 objectref_get_or_create(L, player);
3919                 if(lua_pcall(L, 1, 1, 0))
3920                         script_error(L, "error: %s", lua_tostring(L, -1));
3921                 bool positioning_handled = lua_toboolean(L, -1);
3922                 lua_pop(L, 1);
3923                 if(positioning_handled)
3924                         positioning_handled_by_some = true;
3925                 // value removed, keep key for next iteration
3926         }
3927         return positioning_handled_by_some;
3928 }
3929
3930 void scriptapi_get_creative_inventory(lua_State *L, ServerRemotePlayer *player)
3931 {
3932         lua_getglobal(L, "minetest");
3933         lua_getfield(L, -1, "creative_inventory");
3934         luaL_checktype(L, -1, LUA_TTABLE);
3935         inventory_set_list_from_lua(&player->inventory, "main", L, -1,
3936                         PLAYER_INVENTORY_SIZE);
3937 }
3938
3939 /*
3940         item callbacks and node callbacks
3941 */
3942
3943 // Retrieves minetest.registered_items[name][callbackname]
3944 // If that is nil or on error, return false and stack is unchanged
3945 // If that is a function, returns true and pushes the
3946 // function onto the stack
3947 static bool get_item_callback(lua_State *L,
3948                 const char *name, const char *callbackname)
3949 {
3950         lua_getglobal(L, "minetest");
3951         lua_getfield(L, -1, "registered_items");
3952         lua_remove(L, -2);
3953         luaL_checktype(L, -1, LUA_TTABLE);
3954         lua_getfield(L, -1, name);
3955         lua_remove(L, -2);
3956         // Should be a table
3957         if(lua_type(L, -1) != LUA_TTABLE)
3958         {
3959                 errorstream<<"Item \""<<name<<"\" not defined"<<std::endl;
3960                 lua_pop(L, 1);
3961                 return false;
3962         }
3963         lua_getfield(L, -1, callbackname);
3964         lua_remove(L, -2);
3965         // Should be a function or nil
3966         if(lua_type(L, -1) == LUA_TFUNCTION)
3967         {
3968                 return true;
3969         }
3970         else if(lua_isnil(L, -1))
3971         {
3972                 lua_pop(L, 1);
3973                 return false;
3974         }
3975         else
3976         {
3977                 errorstream<<"Item \""<<name<<"\" callback \""
3978                         <<callbackname<<" is not a function"<<std::endl;
3979                 lua_pop(L, 1);
3980                 return false;
3981         }
3982 }
3983
3984 bool scriptapi_item_on_drop(lua_State *L, ItemStack &item,
3985                 ServerActiveObject *dropper, v3f pos)
3986 {
3987         realitycheck(L);
3988         assert(lua_checkstack(L, 20));
3989         StackUnroller stack_unroller(L);
3990
3991         // Push callback function on stack
3992         if(!get_item_callback(L, item.name.c_str(), "on_drop"))
3993                 return false;
3994
3995         // Call function
3996         LuaItemStack::create(L, item);
3997         objectref_get_or_create(L, dropper);
3998         pushFloatPos(L, pos);
3999         if(lua_pcall(L, 3, 1, 0))
4000                 script_error(L, "error: %s", lua_tostring(L, -1));
4001         if(!lua_isnil(L, -1))
4002                 item = read_item(L, -1);
4003         return true;
4004 }
4005
4006 bool scriptapi_item_on_place(lua_State *L, ItemStack &item,
4007                 ServerActiveObject *placer, const PointedThing &pointed)
4008 {
4009         realitycheck(L);
4010         assert(lua_checkstack(L, 20));
4011         StackUnroller stack_unroller(L);
4012
4013         // Push callback function on stack
4014         if(!get_item_callback(L, item.name.c_str(), "on_place"))
4015                 return false;
4016
4017         // Call function
4018         LuaItemStack::create(L, item);
4019         objectref_get_or_create(L, placer);
4020         push_pointed_thing(L, pointed);
4021         if(lua_pcall(L, 3, 1, 0))
4022                 script_error(L, "error: %s", lua_tostring(L, -1));
4023         if(!lua_isnil(L, -1))
4024                 item = read_item(L, -1);
4025         return true;
4026 }
4027
4028 bool scriptapi_item_on_use(lua_State *L, ItemStack &item,
4029                 ServerActiveObject *user, const PointedThing &pointed)
4030 {
4031         realitycheck(L);
4032         assert(lua_checkstack(L, 20));
4033         StackUnroller stack_unroller(L);
4034
4035         // Push callback function on stack
4036         if(!get_item_callback(L, item.name.c_str(), "on_use"))
4037                 return false;
4038
4039         // Call function
4040         LuaItemStack::create(L, item);
4041         objectref_get_or_create(L, user);
4042         push_pointed_thing(L, pointed);
4043         if(lua_pcall(L, 3, 1, 0))
4044                 script_error(L, "error: %s", lua_tostring(L, -1));
4045         if(!lua_isnil(L, -1))
4046                 item = read_item(L, -1);
4047         return true;
4048 }
4049
4050 bool scriptapi_node_on_punch(lua_State *L, v3s16 pos, MapNode node,
4051                 ServerActiveObject *puncher)
4052 {
4053         realitycheck(L);
4054         assert(lua_checkstack(L, 20));
4055         StackUnroller stack_unroller(L);
4056
4057         INodeDefManager *ndef = get_server(L)->ndef();
4058
4059         // Push callback function on stack
4060         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_punch"))
4061                 return false;
4062
4063         // Call function
4064         push_v3s16(L, pos);
4065         pushnode(L, node, ndef);
4066         objectref_get_or_create(L, puncher);
4067         if(lua_pcall(L, 3, 0, 0))
4068                 script_error(L, "error: %s", lua_tostring(L, -1));
4069         return true;
4070 }
4071
4072 bool scriptapi_node_on_dig(lua_State *L, v3s16 pos, MapNode node,
4073                 ServerActiveObject *digger)
4074 {
4075         realitycheck(L);
4076         assert(lua_checkstack(L, 20));
4077         StackUnroller stack_unroller(L);
4078
4079         INodeDefManager *ndef = get_server(L)->ndef();
4080
4081         // Push callback function on stack
4082         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_dig"))
4083                 return false;
4084
4085         // Call function
4086         push_v3s16(L, pos);
4087         pushnode(L, node, ndef);
4088         objectref_get_or_create(L, digger);
4089         if(lua_pcall(L, 3, 0, 0))
4090                 script_error(L, "error: %s", lua_tostring(L, -1));
4091         return true;
4092 }
4093
4094 /*
4095         environment
4096 */
4097
4098 void scriptapi_environment_step(lua_State *L, float dtime)
4099 {
4100         realitycheck(L);
4101         assert(lua_checkstack(L, 20));
4102         //infostream<<"scriptapi_environment_step"<<std::endl;
4103         StackUnroller stack_unroller(L);
4104
4105         // Get minetest.registered_globalsteps
4106         lua_getglobal(L, "minetest");
4107         lua_getfield(L, -1, "registered_globalsteps");
4108         luaL_checktype(L, -1, LUA_TTABLE);
4109         int table = lua_gettop(L);
4110         // Foreach
4111         lua_pushnil(L);
4112         while(lua_next(L, table) != 0){
4113                 // key at index -2 and value at index -1
4114                 luaL_checktype(L, -1, LUA_TFUNCTION);
4115                 // Call function
4116                 lua_pushnumber(L, dtime);
4117                 if(lua_pcall(L, 1, 0, 0))
4118                         script_error(L, "error: %s", lua_tostring(L, -1));
4119                 // value removed, keep key for next iteration
4120         }
4121 }
4122
4123 void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp)
4124 {
4125         realitycheck(L);
4126         assert(lua_checkstack(L, 20));
4127         //infostream<<"scriptapi_environment_on_generated"<<std::endl;
4128         StackUnroller stack_unroller(L);
4129
4130         // Get minetest.registered_on_generateds
4131         lua_getglobal(L, "minetest");
4132         lua_getfield(L, -1, "registered_on_generateds");
4133         luaL_checktype(L, -1, LUA_TTABLE);
4134         int table = lua_gettop(L);
4135         // Foreach
4136         lua_pushnil(L);
4137         while(lua_next(L, table) != 0){
4138                 // key at index -2 and value at index -1
4139                 luaL_checktype(L, -1, LUA_TFUNCTION);
4140                 // Call function
4141                 push_v3s16(L, minp);
4142                 push_v3s16(L, maxp);
4143                 if(lua_pcall(L, 2, 0, 0))
4144                         script_error(L, "error: %s", lua_tostring(L, -1));
4145                 // value removed, keep key for next iteration
4146         }
4147 }
4148
4149 /*
4150         luaentity
4151 */
4152
4153 bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name,
4154                 const std::string &staticdata)
4155 {
4156         realitycheck(L);
4157         assert(lua_checkstack(L, 20));
4158         infostream<<"scriptapi_luaentity_add: id="<<id<<" name=\""
4159                         <<name<<"\""<<std::endl;
4160         StackUnroller stack_unroller(L);
4161
4162         // Get minetest.registered_entities[name]
4163         lua_getglobal(L, "minetest");
4164         lua_getfield(L, -1, "registered_entities");
4165         luaL_checktype(L, -1, LUA_TTABLE);
4166         lua_pushstring(L, name);
4167         lua_gettable(L, -2);
4168         // Should be a table, which we will use as a prototype
4169         //luaL_checktype(L, -1, LUA_TTABLE);
4170         if(lua_type(L, -1) != LUA_TTABLE){
4171                 errorstream<<"LuaEntity name \""<<name<<"\" not defined"<<std::endl;
4172                 return false;
4173         }
4174         int prototype_table = lua_gettop(L);
4175         //dump2(L, "prototype_table");
4176
4177         // Create entity object
4178         lua_newtable(L);
4179         int object = lua_gettop(L);
4180
4181         // Set object metatable
4182         lua_pushvalue(L, prototype_table);
4183         lua_setmetatable(L, -2);
4184
4185         // Add object reference
4186         // This should be userdata with metatable ObjectRef
4187         objectref_get(L, id);
4188         luaL_checktype(L, -1, LUA_TUSERDATA);
4189         if(!luaL_checkudata(L, -1, "ObjectRef"))
4190                 luaL_typerror(L, -1, "ObjectRef");
4191         lua_setfield(L, -2, "object");
4192
4193         // minetest.luaentities[id] = object
4194         lua_getglobal(L, "minetest");
4195         lua_getfield(L, -1, "luaentities");
4196         luaL_checktype(L, -1, LUA_TTABLE);
4197         lua_pushnumber(L, id); // Push id
4198         lua_pushvalue(L, object); // Copy object to top of stack
4199         lua_settable(L, -3);
4200
4201         // Get on_activate function
4202         lua_pushvalue(L, object);
4203         lua_getfield(L, -1, "on_activate");
4204         if(!lua_isnil(L, -1)){
4205                 luaL_checktype(L, -1, LUA_TFUNCTION);
4206                 lua_pushvalue(L, object); // self
4207                 lua_pushlstring(L, staticdata.c_str(), staticdata.size());
4208                 // Call with 2 arguments, 0 results
4209                 if(lua_pcall(L, 2, 0, 0))
4210                         script_error(L, "error running function %s:on_activate: %s\n",
4211                                         name, lua_tostring(L, -1));
4212         }
4213
4214         return true;
4215 }
4216
4217 void scriptapi_luaentity_rm(lua_State *L, u16 id)
4218 {
4219         realitycheck(L);
4220         assert(lua_checkstack(L, 20));
4221         infostream<<"scriptapi_luaentity_rm: id="<<id<<std::endl;
4222
4223         // Get minetest.luaentities table
4224         lua_getglobal(L, "minetest");
4225         lua_getfield(L, -1, "luaentities");
4226         luaL_checktype(L, -1, LUA_TTABLE);
4227         int objectstable = lua_gettop(L);
4228
4229         // Set luaentities[id] = nil
4230         lua_pushnumber(L, id); // Push id
4231         lua_pushnil(L);
4232         lua_settable(L, objectstable);
4233
4234         lua_pop(L, 2); // pop luaentities, minetest
4235 }
4236
4237 std::string scriptapi_luaentity_get_staticdata(lua_State *L, u16 id)
4238 {
4239         realitycheck(L);
4240         assert(lua_checkstack(L, 20));
4241         infostream<<"scriptapi_luaentity_get_staticdata: id="<<id<<std::endl;
4242         StackUnroller stack_unroller(L);
4243
4244         // Get minetest.luaentities[id]
4245         luaentity_get(L, id);
4246         int object = lua_gettop(L);
4247
4248         // Get get_staticdata function
4249         lua_pushvalue(L, object);
4250         lua_getfield(L, -1, "get_staticdata");
4251         if(lua_isnil(L, -1))
4252                 return "";
4253
4254         luaL_checktype(L, -1, LUA_TFUNCTION);
4255         lua_pushvalue(L, object); // self
4256         // Call with 1 arguments, 1 results
4257         if(lua_pcall(L, 1, 1, 0))
4258                 script_error(L, "error running function get_staticdata: %s\n",
4259                                 lua_tostring(L, -1));
4260
4261         size_t len=0;
4262         const char *s = lua_tolstring(L, -1, &len);
4263         return std::string(s, len);
4264 }
4265
4266 void scriptapi_luaentity_get_properties(lua_State *L, u16 id,
4267                 LuaEntityProperties *prop)
4268 {
4269         realitycheck(L);
4270         assert(lua_checkstack(L, 20));
4271         infostream<<"scriptapi_luaentity_get_properties: id="<<id<<std::endl;
4272         StackUnroller stack_unroller(L);
4273
4274         // Get minetest.luaentities[id]
4275         luaentity_get(L, id);
4276         //int object = lua_gettop(L);
4277
4278         /* Read stuff */
4279
4280         getboolfield(L, -1, "physical", prop->physical);
4281
4282         getfloatfield(L, -1, "weight", prop->weight);
4283
4284         lua_getfield(L, -1, "collisionbox");
4285         if(lua_istable(L, -1))
4286                 prop->collisionbox = read_aabbox3df32(L, -1, 1.0);
4287         lua_pop(L, 1);
4288
4289         getstringfield(L, -1, "visual", prop->visual);
4290
4291         lua_getfield(L, -1, "visual_size");
4292         if(lua_istable(L, -1))
4293                 prop->visual_size = read_v2f(L, -1);
4294         lua_pop(L, 1);
4295
4296         lua_getfield(L, -1, "textures");
4297         if(lua_istable(L, -1)){
4298                 prop->textures.clear();
4299                 int table = lua_gettop(L);
4300                 lua_pushnil(L);
4301                 while(lua_next(L, table) != 0){
4302                         // key at index -2 and value at index -1
4303                         if(lua_isstring(L, -1))
4304                                 prop->textures.push_back(lua_tostring(L, -1));
4305                         else
4306                                 prop->textures.push_back("");
4307                         // removes value, keeps key for next iteration
4308                         lua_pop(L, 1);
4309                 }
4310         }
4311         lua_pop(L, 1);
4312
4313         lua_getfield(L, -1, "spritediv");
4314         if(lua_istable(L, -1))
4315                 prop->spritediv = read_v2s16(L, -1);
4316         lua_pop(L, 1);
4317
4318         lua_getfield(L, -1, "initial_sprite_basepos");
4319         if(lua_istable(L, -1))
4320                 prop->initial_sprite_basepos = read_v2s16(L, -1);
4321         lua_pop(L, 1);
4322 }
4323
4324 void scriptapi_luaentity_step(lua_State *L, u16 id, float dtime)
4325 {
4326         realitycheck(L);
4327         assert(lua_checkstack(L, 20));
4328         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
4329         StackUnroller stack_unroller(L);
4330
4331         // Get minetest.luaentities[id]
4332         luaentity_get(L, id);
4333         int object = lua_gettop(L);
4334         // State: object is at top of stack
4335         // Get step function
4336         lua_getfield(L, -1, "on_step");
4337         if(lua_isnil(L, -1))
4338                 return;
4339         luaL_checktype(L, -1, LUA_TFUNCTION);
4340         lua_pushvalue(L, object); // self
4341         lua_pushnumber(L, dtime); // dtime
4342         // Call with 2 arguments, 0 results
4343         if(lua_pcall(L, 2, 0, 0))
4344                 script_error(L, "error running function 'on_step': %s\n", lua_tostring(L, -1));
4345 }
4346
4347 // Calls entity:on_punch(ObjectRef puncher, time_from_last_punch)
4348 void scriptapi_luaentity_punch(lua_State *L, u16 id,
4349                 ServerActiveObject *puncher, float time_from_last_punch)
4350 {
4351         realitycheck(L);
4352         assert(lua_checkstack(L, 20));
4353         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
4354         StackUnroller stack_unroller(L);
4355
4356         // Get minetest.luaentities[id]
4357         luaentity_get(L, id);
4358         int object = lua_gettop(L);
4359         // State: object is at top of stack
4360         // Get function
4361         lua_getfield(L, -1, "on_punch");
4362         if(lua_isnil(L, -1))
4363                 return;
4364         luaL_checktype(L, -1, LUA_TFUNCTION);
4365         lua_pushvalue(L, object); // self
4366         objectref_get_or_create(L, puncher); // Clicker reference
4367         lua_pushnumber(L, time_from_last_punch);
4368         // Call with 2 arguments, 0 results
4369         if(lua_pcall(L, 3, 0, 0))
4370                 script_error(L, "error running function 'on_punch': %s\n", lua_tostring(L, -1));
4371 }
4372
4373 // Calls entity:on_rightclick(ObjectRef clicker)
4374 void scriptapi_luaentity_rightclick(lua_State *L, u16 id,
4375                 ServerActiveObject *clicker)
4376 {
4377         realitycheck(L);
4378         assert(lua_checkstack(L, 20));
4379         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
4380         StackUnroller stack_unroller(L);
4381
4382         // Get minetest.luaentities[id]
4383         luaentity_get(L, id);
4384         int object = lua_gettop(L);
4385         // State: object is at top of stack
4386         // Get function
4387         lua_getfield(L, -1, "on_rightclick");
4388         if(lua_isnil(L, -1))
4389                 return;
4390         luaL_checktype(L, -1, LUA_TFUNCTION);
4391         lua_pushvalue(L, object); // self
4392         objectref_get_or_create(L, clicker); // Clicker reference
4393         // Call with 2 arguments, 0 results
4394         if(lua_pcall(L, 2, 0, 0))
4395                 script_error(L, "error running function 'on_rightclick': %s\n", lua_tostring(L, -1));
4396 }
4397