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 Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser 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 "object_properties.h"
  37 #include "content_sao.h" // For LuaEntitySAO and PlayerSAO
  38 #include "itemdef.h"
  39 #include "nodedef.h"
  40 #include "craftdef.h"
  41 #include "main.h" // For g_settings
  42 #include "settings.h" // For accessing g_settings
  43 #include "nodemetadata.h"
  44 #include "mapblock.h" // For getNodeBlockPos
  45 #include "content_nodemeta.h"
  46 #include "tool.h"
  47 #include "daynightratio.h"
  48 #include "noise.h" // PseudoRandom for LuaPseudoRandom
  49 #include "util/pointedthing.h"
  50
  51 static void stackDump(lua_State *L, std::ostream &o)
  52 {
  53   int i;
  54   int top = lua_gettop(L);
  55   for (i = 1; i <= top; i++) {  /* repeat for each level */
  56         int t = lua_type(L, i);
  57         switch (t) {
  58
  59           case LUA_TSTRING:  /* strings */
  60                 o<<"\""<<lua_tostring(L, i)<<"\"";
  61                 break;
  62
  63           case LUA_TBOOLEAN:  /* booleans */
  64                 o<<(lua_toboolean(L, i) ? "true" : "false");
  65                 break;
  66
  67           case LUA_TNUMBER:  /* numbers */ {
  68                 char buf[10];
  69                 snprintf(buf, 10, "%g", lua_tonumber(L, i));
  70                 o<<buf;
  71                 break; }
  72
  73           default:  /* other values */
  74                 o<<lua_typename(L, t);
  75                 break;
  76
  77         }
  78         o<<" ";
  79   }
  80   o<<std::endl;
  81 }
  82
  83 static void realitycheck(lua_State *L)
  84 {
  85         int top = lua_gettop(L);
  86         if(top >= 30){
  87                 dstream<<"Stack is over 30:"<<std::endl;
  88                 stackDump(L, dstream);
  89                 script_error(L, "Stack is over 30 (reality check)");
  90         }
  91 }
  92
  93 class StackUnroller
  94 {
  95 private:
  96         lua_State *m_lua;
  97         int m_original_top;
  98 public:
  99         StackUnroller(lua_State *L):
 100                 m_lua(L),
 101                 m_original_top(-1)
 102         {
 103                 m_original_top = lua_gettop(m_lua); // store stack height
 104         }
 105         ~StackUnroller()
 106         {
 107                 lua_settop(m_lua, m_original_top); // restore stack height
 108         }
 109 };
 110
 111 class ModNameStorer
 112 {
 113 private:
 114         lua_State *L;
 115 public:
 116         ModNameStorer(lua_State *L_, const std::string modname):
 117                 L(L_)
 118         {
 119                 // Store current modname in registry
 120                 lua_pushstring(L, modname.c_str());
 121                 lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
 122         }
 123         ~ModNameStorer()
 124         {
 125                 // Clear current modname in registry
 126                 lua_pushnil(L);
 127                 lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
 128         }
 129 };
 130
 131 /*
 132         Getters for stuff in main tables
 133 */
 134
 135 static Server* get_server(lua_State *L)
 136 {
 137         // Get server from registry
 138         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_server");
 139         Server *server = (Server*)lua_touserdata(L, -1);
 140         lua_pop(L, 1);
 141         return server;
 142 }
 143
 144 static ServerEnvironment* get_env(lua_State *L)
 145 {
 146         // Get environment from registry
 147         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_env");
 148         ServerEnvironment *env = (ServerEnvironment*)lua_touserdata(L, -1);
 149         lua_pop(L, 1);
 150         return env;
 151 }
 152
 153 static void objectref_get(lua_State *L, u16 id)
 154 {
 155         // Get minetest.object_refs[i]
 156         lua_getglobal(L, "minetest");
 157         lua_getfield(L, -1, "object_refs");
 158         luaL_checktype(L, -1, LUA_TTABLE);
 159         lua_pushnumber(L, id);
 160         lua_gettable(L, -2);
 161         lua_remove(L, -2); // object_refs
 162         lua_remove(L, -2); // minetest
 163 }
 164
 165 static void luaentity_get(lua_State *L, u16 id)
 166 {
 167         // Get minetest.luaentities[i]
 168         lua_getglobal(L, "minetest");
 169         lua_getfield(L, -1, "luaentities");
 170         luaL_checktype(L, -1, LUA_TTABLE);
 171         lua_pushnumber(L, id);
 172         lua_gettable(L, -2);
 173         lua_remove(L, -2); // luaentities
 174         lua_remove(L, -2); // minetest
 175 }
 176
 177 /*
 178         Table field getters
 179 */
 180
 181 static bool getstringfield(lua_State *L, int table,
 182                 const char *fieldname, std::string &result)
 183 {
 184         lua_getfield(L, table, fieldname);
 185         bool got = false;
 186         if(lua_isstring(L, -1)){
 187                 size_t len = 0;
 188                 const char *ptr = lua_tolstring(L, -1, &len);
 189                 result.assign(ptr, len);
 190                 got = true;
 191         }
 192         lua_pop(L, 1);
 193         return got;
 194 }
 195
 196 static bool getintfield(lua_State *L, int table,
 197                 const char *fieldname, int &result)
 198 {
 199         lua_getfield(L, table, fieldname);
 200         bool got = false;
 201         if(lua_isnumber(L, -1)){
 202                 result = lua_tonumber(L, -1);
 203                 got = true;
 204         }
 205         lua_pop(L, 1);
 206         return got;
 207 }
 208
 209 static bool getfloatfield(lua_State *L, int table,
 210                 const char *fieldname, float &result)
 211 {
 212         lua_getfield(L, table, fieldname);
 213         bool got = false;
 214         if(lua_isnumber(L, -1)){
 215                 result = lua_tonumber(L, -1);
 216                 got = true;
 217         }
 218         lua_pop(L, 1);
 219         return got;
 220 }
 221
 222 static bool getboolfield(lua_State *L, int table,
 223                 const char *fieldname, bool &result)
 224 {
 225         lua_getfield(L, table, fieldname);
 226         bool got = false;
 227         if(lua_isboolean(L, -1)){
 228                 result = lua_toboolean(L, -1);
 229                 got = true;
 230         }
 231         lua_pop(L, 1);
 232         return got;
 233 }
 234
 235 static std::string checkstringfield(lua_State *L, int table,
 236                 const char *fieldname)
 237 {
 238         lua_getfield(L, table, fieldname);
 239         std::string s = luaL_checkstring(L, -1);
 240         lua_pop(L, 1);
 241         return s;
 242 }
 243
 244 static std::string getstringfield_default(lua_State *L, int table,
 245                 const char *fieldname, const std::string &default_)
 246 {
 247         std::string result = default_;
 248         getstringfield(L, table, fieldname, result);
 249         return result;
 250 }
 251
 252 static int getintfield_default(lua_State *L, int table,
 253                 const char *fieldname, int default_)
 254 {
 255         int result = default_;
 256         getintfield(L, table, fieldname, result);
 257         return result;
 258 }
 259
 260 static float getfloatfield_default(lua_State *L, int table,
 261                 const char *fieldname, float default_)
 262 {
 263         float result = default_;
 264         getfloatfield(L, table, fieldname, result);
 265         return result;
 266 }
 267
 268 static bool getboolfield_default(lua_State *L, int table,
 269                 const char *fieldname, bool default_)
 270 {
 271         bool result = default_;
 272         getboolfield(L, table, fieldname, result);
 273         return result;
 274 }
 275
 276 struct EnumString
 277 {
 278         int num;
 279         const char *str;
 280 };
 281
 282 static bool string_to_enum(const EnumString *spec, int &result,
 283                 const std::string &str)
 284 {
 285         const EnumString *esp = spec;
 286         while(esp->str){
 287                 if(str == std::string(esp->str)){
 288                         result = esp->num;
 289                         return true;
 290                 }
 291                 esp++;
 292         }
 293         return false;
 294 }
 295
 296 /*static bool enum_to_string(const EnumString *spec, std::string &result,
 297                 int num)
 298 {
 299         const EnumString *esp = spec;
 300         while(esp){
 301                 if(num == esp->num){
 302                         result = esp->str;
 303                         return true;
 304                 }
 305                 esp++;
 306         }
 307         return false;
 308 }*/
 309
 310 static int getenumfield(lua_State *L, int table,
 311                 const char *fieldname, const EnumString *spec, int default_)
 312 {
 313         int result = default_;
 314         string_to_enum(spec, result,
 315                         getstringfield_default(L, table, fieldname, ""));
 316         return result;
 317 }
 318
 319 static void setintfield(lua_State *L, int table,
 320                 const char *fieldname, int value)
 321 {
 322         lua_pushinteger(L, value);
 323         if(table < 0)
 324                 table -= 1;
 325         lua_setfield(L, table, fieldname);
 326 }
 327
 328 static void setfloatfield(lua_State *L, int table,
 329                 const char *fieldname, float value)
 330 {
 331         lua_pushnumber(L, value);
 332         if(table < 0)
 333                 table -= 1;
 334         lua_setfield(L, table, fieldname);
 335 }
 336
 337 static void setboolfield(lua_State *L, int table,
 338                 const char *fieldname, bool value)
 339 {
 340         lua_pushboolean(L, value);
 341         if(table < 0)
 342                 table -= 1;
 343         lua_setfield(L, table, fieldname);
 344 }
 345
 346 static void warn_if_field_exists(lua_State *L, int table,
 347                 const char *fieldname, const std::string &message)
 348 {
 349         lua_getfield(L, table, fieldname);
 350         if(!lua_isnil(L, -1)){
 351                 infostream<<script_get_backtrace(L)<<std::endl;
 352                 infostream<<"WARNING: field \""<<fieldname<<"\": "
 353                                 <<message<<std::endl;
 354         }
 355         lua_pop(L, 1);
 356 }
 357
 358 /*
 359         EnumString definitions
 360 */
 361
 362 struct EnumString es_ItemType[] =
 363 {
 364         {ITEM_NONE, "none"},
 365         {ITEM_NODE, "node"},
 366         {ITEM_CRAFT, "craft"},
 367         {ITEM_TOOL, "tool"},
 368         {0, NULL},
 369 };
 370
 371 struct EnumString es_DrawType[] =
 372 {
 373         {NDT_NORMAL, "normal"},
 374         {NDT_AIRLIKE, "airlike"},
 375         {NDT_LIQUID, "liquid"},
 376         {NDT_FLOWINGLIQUID, "flowingliquid"},
 377         {NDT_GLASSLIKE, "glasslike"},
 378         {NDT_ALLFACES, "allfaces"},
 379         {NDT_ALLFACES_OPTIONAL, "allfaces_optional"},
 380         {NDT_TORCHLIKE, "torchlike"},
 381         {NDT_SIGNLIKE, "signlike"},
 382         {NDT_PLANTLIKE, "plantlike"},
 383         {NDT_FENCELIKE, "fencelike"},
 384         {NDT_RAILLIKE, "raillike"},
 385         {NDT_NODEBOX, "nodebox"},
 386         {0, NULL},
 387 };
 388
 389 struct EnumString es_ContentParamType[] =
 390 {
 391         {CPT_NONE, "none"},
 392         {CPT_LIGHT, "light"},
 393         {0, NULL},
 394 };
 395
 396 struct EnumString es_ContentParamType2[] =
 397 {
 398         {CPT2_NONE, "none"},
 399         {CPT2_FULL, "full"},
 400         {CPT2_FLOWINGLIQUID, "flowingliquid"},
 401         {CPT2_FACEDIR, "facedir"},
 402         {CPT2_WALLMOUNTED, "wallmounted"},
 403         {0, NULL},
 404 };
 405
 406 struct EnumString es_LiquidType[] =
 407 {
 408         {LIQUID_NONE, "none"},
 409         {LIQUID_FLOWING, "flowing"},
 410         {LIQUID_SOURCE, "source"},
 411         {0, NULL},
 412 };
 413
 414 struct EnumString es_NodeBoxType[] =
 415 {
 416         {NODEBOX_REGULAR, "regular"},
 417         {NODEBOX_FIXED, "fixed"},
 418         {NODEBOX_WALLMOUNTED, "wallmounted"},
 419         {0, NULL},
 420 };
 421
 422 struct EnumString es_CraftMethod[] =
 423 {
 424         {CRAFT_METHOD_NORMAL, "normal"},
 425         {CRAFT_METHOD_COOKING, "cooking"},
 426         {CRAFT_METHOD_FUEL, "fuel"},
 427         {0, NULL},
 428 };
 429
 430 struct EnumString es_TileAnimationType[] =
 431 {
 432         {TAT_NONE, "none"},
 433         {TAT_VERTICAL_FRAMES, "vertical_frames"},
 434         {0, NULL},
 435 };
 436
 437 /*
 438         C struct <-> Lua table converter functions
 439 */
 440
 441 static void push_v3f(lua_State *L, v3f p)
 442 {
 443         lua_newtable(L);
 444         lua_pushnumber(L, p.X);
 445         lua_setfield(L, -2, "x");
 446         lua_pushnumber(L, p.Y);
 447         lua_setfield(L, -2, "y");
 448         lua_pushnumber(L, p.Z);
 449         lua_setfield(L, -2, "z");
 450 }
 451
 452 static v2s16 read_v2s16(lua_State *L, int index)
 453 {
 454         v2s16 p;
 455         luaL_checktype(L, index, LUA_TTABLE);
 456         lua_getfield(L, index, "x");
 457         p.X = lua_tonumber(L, -1);
 458         lua_pop(L, 1);
 459         lua_getfield(L, index, "y");
 460         p.Y = lua_tonumber(L, -1);
 461         lua_pop(L, 1);
 462         return p;
 463 }
 464
 465 static v2f read_v2f(lua_State *L, int index)
 466 {
 467         v2f p;
 468         luaL_checktype(L, index, LUA_TTABLE);
 469         lua_getfield(L, index, "x");
 470         p.X = lua_tonumber(L, -1);
 471         lua_pop(L, 1);
 472         lua_getfield(L, index, "y");
 473         p.Y = lua_tonumber(L, -1);
 474         lua_pop(L, 1);
 475         return p;
 476 }
 477
 478 static v3f read_v3f(lua_State *L, int index)
 479 {
 480         v3f pos;
 481         luaL_checktype(L, index, LUA_TTABLE);
 482         lua_getfield(L, index, "x");
 483         pos.X = lua_tonumber(L, -1);
 484         lua_pop(L, 1);
 485         lua_getfield(L, index, "y");
 486         pos.Y = lua_tonumber(L, -1);
 487         lua_pop(L, 1);
 488         lua_getfield(L, index, "z");
 489         pos.Z = lua_tonumber(L, -1);
 490         lua_pop(L, 1);
 491         return pos;
 492 }
 493
 494 static v3f check_v3f(lua_State *L, int index)
 495 {
 496         v3f pos;
 497         luaL_checktype(L, index, LUA_TTABLE);
 498         lua_getfield(L, index, "x");
 499         pos.X = luaL_checknumber(L, -1);
 500         lua_pop(L, 1);
 501         lua_getfield(L, index, "y");
 502         pos.Y = luaL_checknumber(L, -1);
 503         lua_pop(L, 1);
 504         lua_getfield(L, index, "z");
 505         pos.Z = luaL_checknumber(L, -1);
 506         lua_pop(L, 1);
 507         return pos;
 508 }
 509
 510 static void pushFloatPos(lua_State *L, v3f p)
 511 {
 512         p /= BS;
 513         push_v3f(L, p);
 514 }
 515
 516 static v3f checkFloatPos(lua_State *L, int index)
 517 {
 518         return check_v3f(L, index) * BS;
 519 }
 520
 521 static void push_v3s16(lua_State *L, v3s16 p)
 522 {
 523         lua_newtable(L);
 524         lua_pushnumber(L, p.X);
 525         lua_setfield(L, -2, "x");
 526         lua_pushnumber(L, p.Y);
 527         lua_setfield(L, -2, "y");
 528         lua_pushnumber(L, p.Z);
 529         lua_setfield(L, -2, "z");
 530 }
 531
 532 static v3s16 read_v3s16(lua_State *L, int index)
 533 {
 534         // Correct rounding at <0
 535         v3f pf = read_v3f(L, index);
 536         return floatToInt(pf, 1.0);
 537 }
 538
 539 static v3s16 check_v3s16(lua_State *L, int index)
 540 {
 541         // Correct rounding at <0
 542         v3f pf = check_v3f(L, index);
 543         return floatToInt(pf, 1.0);
 544 }
 545
 546 static void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
 547 {
 548         lua_newtable(L);
 549         lua_pushstring(L, ndef->get(n).name.c_str());
 550         lua_setfield(L, -2, "name");
 551         lua_pushnumber(L, n.getParam1());
 552         lua_setfield(L, -2, "param1");
 553         lua_pushnumber(L, n.getParam2());
 554         lua_setfield(L, -2, "param2");
 555 }
 556
 557 static MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
 558 {
 559         lua_getfield(L, index, "name");
 560         const char *name = luaL_checkstring(L, -1);
 561         lua_pop(L, 1);
 562         u8 param1;
 563         lua_getfield(L, index, "param1");
 564         if(lua_isnil(L, -1))
 565                 param1 = 0;
 566         else
 567                 param1 = lua_tonumber(L, -1);
 568         lua_pop(L, 1);
 569         u8 param2;
 570         lua_getfield(L, index, "param2");
 571         if(lua_isnil(L, -1))
 572                 param2 = 0;
 573         else
 574                 param2 = lua_tonumber(L, -1);
 575         lua_pop(L, 1);
 576         return MapNode(ndef, name, param1, param2);
 577 }
 578
 579 static video::SColor readARGB8(lua_State *L, int index)
 580 {
 581         video::SColor color;
 582         luaL_checktype(L, index, LUA_TTABLE);
 583         lua_getfield(L, index, "a");
 584         if(lua_isnumber(L, -1))
 585                 color.setAlpha(lua_tonumber(L, -1));
 586         lua_pop(L, 1);
 587         lua_getfield(L, index, "r");
 588         color.setRed(lua_tonumber(L, -1));
 589         lua_pop(L, 1);
 590         lua_getfield(L, index, "g");
 591         color.setGreen(lua_tonumber(L, -1));
 592         lua_pop(L, 1);
 593         lua_getfield(L, index, "b");
 594         color.setBlue(lua_tonumber(L, -1));
 595         lua_pop(L, 1);
 596         return color;
 597 }
 598
 599 static aabb3f read_aabb3f(lua_State *L, int index, f32 scale)
 600 {
 601         aabb3f box;
 602         if(lua_istable(L, index)){
 603                 lua_rawgeti(L, index, 1);
 604                 box.MinEdge.X = lua_tonumber(L, -1) * scale;
 605                 lua_pop(L, 1);
 606                 lua_rawgeti(L, index, 2);
 607                 box.MinEdge.Y = lua_tonumber(L, -1) * scale;
 608                 lua_pop(L, 1);
 609                 lua_rawgeti(L, index, 3);
 610                 box.MinEdge.Z = lua_tonumber(L, -1) * scale;
 611                 lua_pop(L, 1);
 612                 lua_rawgeti(L, index, 4);
 613                 box.MaxEdge.X = lua_tonumber(L, -1) * scale;
 614                 lua_pop(L, 1);
 615                 lua_rawgeti(L, index, 5);
 616                 box.MaxEdge.Y = lua_tonumber(L, -1) * scale;
 617                 lua_pop(L, 1);
 618                 lua_rawgeti(L, index, 6);
 619                 box.MaxEdge.Z = lua_tonumber(L, -1) * scale;
 620                 lua_pop(L, 1);
 621         }
 622         return box;
 623 }
 624
 625 static std::vector<aabb3f> read_aabb3f_vector(lua_State *L, int index, f32 scale)
 626 {
 627         std::vector<aabb3f> boxes;
 628         if(lua_istable(L, index)){
 629                 int n = lua_objlen(L, index);
 630                 // Check if it's a single box or a list of boxes
 631                 bool possibly_single_box = (n == 6);
 632                 for(int i = 1; i <= n && possibly_single_box; i++){
 633                         lua_rawgeti(L, index, i);
 634                         if(!lua_isnumber(L, -1))
 635                                 possibly_single_box = false;
 636                         lua_pop(L, 1);
 637                 }
 638                 if(possibly_single_box){
 639                         // Read a single box
 640                         boxes.push_back(read_aabb3f(L, index, scale));
 641                 } else {
 642                         // Read a list of boxes
 643                         for(int i = 1; i <= n; i++){
 644                                 lua_rawgeti(L, index, i);
 645                                 boxes.push_back(read_aabb3f(L, -1, scale));
 646                                 lua_pop(L, 1);
 647                         }
 648                 }
 649         }
 650         return boxes;
 651 }
 652
 653 static NodeBox read_nodebox(lua_State *L, int index)
 654 {
 655         NodeBox nodebox;
 656         if(lua_istable(L, -1)){
 657                 nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
 658                                 es_NodeBoxType, NODEBOX_REGULAR);
 659
 660                 lua_getfield(L, index, "fixed");
 661                 if(lua_istable(L, -1))
 662                         nodebox.fixed = read_aabb3f_vector(L, -1, BS);
 663                 lua_pop(L, 1);
 664
 665                 lua_getfield(L, index, "wall_top");
 666                 if(lua_istable(L, -1))
 667                         nodebox.wall_top = read_aabb3f(L, -1, BS);
 668                 lua_pop(L, 1);
 669
 670                 lua_getfield(L, index, "wall_bottom");
 671                 if(lua_istable(L, -1))
 672                         nodebox.wall_bottom = read_aabb3f(L, -1, BS);
 673                 lua_pop(L, 1);
 674
 675                 lua_getfield(L, index, "wall_side");
 676                 if(lua_istable(L, -1))
 677                         nodebox.wall_side = read_aabb3f(L, -1, BS);
 678                 lua_pop(L, 1);
 679         }
 680         return nodebox;
 681 }
 682
 683 /*
 684         Groups
 685 */
 686 static void read_groups(lua_State *L, int index,
 687                 std::map<std::string, int> &result)
 688 {
 689         if (!lua_istable(L,index))
 690                 return;
 691         result.clear();
 692         lua_pushnil(L);
 693         if(index < 0)
 694                 index -= 1;
 695         while(lua_next(L, index) != 0){
 696                 // key at index -2 and value at index -1
 697                 std::string name = luaL_checkstring(L, -2);
 698                 int rating = luaL_checkinteger(L, -1);
 699                 result[name] = rating;
 700                 // removes value, keeps key for next iteration
 701                 lua_pop(L, 1);
 702         }
 703 }
 704
 705 /*
 706         Privileges
 707 */
 708 static void read_privileges(lua_State *L, int index,
 709                 std::set<std::string> &result)
 710 {
 711         result.clear();
 712         lua_pushnil(L);
 713         if(index < 0)
 714                 index -= 1;
 715         while(lua_next(L, index) != 0){
 716                 // key at index -2 and value at index -1
 717                 std::string key = luaL_checkstring(L, -2);
 718                 bool value = lua_toboolean(L, -1);
 719                 if(value)
 720                         result.insert(key);
 721                 // removes value, keeps key for next iteration
 722                 lua_pop(L, 1);
 723         }
 724 }
 725
 726 /*
 727         ToolCapabilities
 728 */
 729
 730 static ToolCapabilities read_tool_capabilities(
 731                 lua_State *L, int table)
 732 {
 733         ToolCapabilities toolcap;
 734         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
 735         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
 736         lua_getfield(L, table, "groupcaps");
 737         if(lua_istable(L, -1)){
 738                 int table_groupcaps = lua_gettop(L);
 739                 lua_pushnil(L);
 740                 while(lua_next(L, table_groupcaps) != 0){
 741                         // key at index -2 and value at index -1
 742                         std::string groupname = luaL_checkstring(L, -2);
 743                         if(lua_istable(L, -1)){
 744                                 int table_groupcap = lua_gettop(L);
 745                                 // This will be created
 746                                 ToolGroupCap groupcap;
 747                                 // Read simple parameters
 748                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
 749                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
 750                                 // DEPRECATED: maxwear
 751                                 float maxwear = 0;
 752                                 if(getfloatfield(L, table_groupcap, "maxwear", maxwear)){
 753                                         if(maxwear != 0)
 754                                                 groupcap.uses = 1.0/maxwear;
 755                                         else
 756                                                 groupcap.uses = 0;
 757                                         infostream<<script_get_backtrace(L)<<std::endl;
 758                                         infostream<<"WARNING: field \"maxwear\" is deprecated; "
 759                                                         <<"should replace with uses=1/maxwear"<<std::endl;
 760                                 }
 761                                 // Read "times" table
 762                                 lua_getfield(L, table_groupcap, "times");
 763                                 if(lua_istable(L, -1)){
 764                                         int table_times = lua_gettop(L);
 765                                         lua_pushnil(L);
 766                                         while(lua_next(L, table_times) != 0){
 767                                                 // key at index -2 and value at index -1
 768                                                 int rating = luaL_checkinteger(L, -2);
 769                                                 float time = luaL_checknumber(L, -1);
 770                                                 groupcap.times[rating] = time;
 771                                                 // removes value, keeps key for next iteration
 772                                                 lua_pop(L, 1);
 773                                         }
 774                                 }
 775                                 lua_pop(L, 1);
 776                                 // Insert groupcap into toolcap
 777                                 toolcap.groupcaps[groupname] = groupcap;
 778                         }
 779                         // removes value, keeps key for next iteration
 780                         lua_pop(L, 1);
 781                 }
 782         }
 783         lua_pop(L, 1);
 784         return toolcap;
 785 }
 786
 787 static void set_tool_capabilities(lua_State *L, int table,
 788                 const ToolCapabilities &toolcap)
 789 {
 790         setfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
 791         setintfield(L, table, "max_drop_level", toolcap.max_drop_level);
 792         // Create groupcaps table
 793         lua_newtable(L);
 794         // For each groupcap
 795         for(std::map<std::string, ToolGroupCap>::const_iterator
 796                         i = toolcap.groupcaps.begin(); i != toolcap.groupcaps.end(); i++){
 797                 // Create groupcap table
 798                 lua_newtable(L);
 799                 const std::string &name = i->first;
 800                 const ToolGroupCap &groupcap = i->second;
 801                 // Create subtable "times"
 802                 lua_newtable(L);
 803                 for(std::map<int, float>::const_iterator
 804                                 i = groupcap.times.begin(); i != groupcap.times.end(); i++){
 805                         int rating = i->first;
 806                         float time = i->second;
 807                         lua_pushinteger(L, rating);
 808                         lua_pushnumber(L, time);
 809                         lua_settable(L, -3);
 810                 }
 811                 // Set subtable "times"
 812                 lua_setfield(L, -2, "times");
 813                 // Set simple parameters
 814                 setintfield(L, -1, "maxlevel", groupcap.maxlevel);
 815                 setintfield(L, -1, "uses", groupcap.uses);
 816                 // Insert groupcap table into groupcaps table
 817                 lua_setfield(L, -2, name.c_str());
 818         }
 819         // Set groupcaps table
 820         lua_setfield(L, -2, "groupcaps");
 821 }
 822
 823 static void push_tool_capabilities(lua_State *L,
 824                 const ToolCapabilities &prop)
 825 {
 826         lua_newtable(L);
 827         set_tool_capabilities(L, -1, prop);
 828 }
 829
 830 /*
 831         DigParams
 832 */
 833
 834 static void set_dig_params(lua_State *L, int table,
 835                 const DigParams &params)
 836 {
 837         setboolfield(L, table, "diggable", params.diggable);
 838         setfloatfield(L, table, "time", params.time);
 839         setintfield(L, table, "wear", params.wear);
 840 }
 841
 842 static void push_dig_params(lua_State *L,
 843                 const DigParams &params)
 844 {
 845         lua_newtable(L);
 846         set_dig_params(L, -1, params);
 847 }
 848
 849 /*
 850         HitParams
 851 */
 852
 853 static void set_hit_params(lua_State *L, int table,
 854                 const HitParams &params)
 855 {
 856         setintfield(L, table, "hp", params.hp);
 857         setintfield(L, table, "wear", params.wear);
 858 }
 859
 860 static void push_hit_params(lua_State *L,
 861                 const HitParams &params)
 862 {
 863         lua_newtable(L);
 864         set_hit_params(L, -1, params);
 865 }
 866
 867 /*
 868         PointedThing
 869 */
 870
 871 static void push_pointed_thing(lua_State *L, const PointedThing& pointed)
 872 {
 873         lua_newtable(L);
 874         if(pointed.type == POINTEDTHING_NODE)
 875         {
 876                 lua_pushstring(L, "node");
 877                 lua_setfield(L, -2, "type");
 878                 push_v3s16(L, pointed.node_undersurface);
 879                 lua_setfield(L, -2, "under");
 880                 push_v3s16(L, pointed.node_abovesurface);
 881                 lua_setfield(L, -2, "above");
 882         }
 883         else if(pointed.type == POINTEDTHING_OBJECT)
 884         {
 885                 lua_pushstring(L, "object");
 886                 lua_setfield(L, -2, "type");
 887                 objectref_get(L, pointed.object_id);
 888                 lua_setfield(L, -2, "ref");
 889         }
 890         else
 891         {
 892                 lua_pushstring(L, "nothing");
 893                 lua_setfield(L, -2, "type");
 894         }
 895 }
 896
 897 /*
 898         SimpleSoundSpec
 899 */
 900
 901 static void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
 902 {
 903         if(index < 0)
 904                 index = lua_gettop(L) + 1 + index;
 905         if(lua_isnil(L, index)){
 906         } else if(lua_istable(L, index)){
 907                 getstringfield(L, index, "name", spec.name);
 908                 getfloatfield(L, index, "gain", spec.gain);
 909         } else if(lua_isstring(L, index)){
 910                 spec.name = lua_tostring(L, index);
 911         }
 912 }
 913
 914 /*
 915         ObjectProperties
 916 */
 917
 918 static void read_object_properties(lua_State *L, int index,
 919                 ObjectProperties *prop)
 920 {
 921         if(index < 0)
 922                 index = lua_gettop(L) + 1 + index;
 923         if(!lua_istable(L, index))
 924                 return;
 925
 926         prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
 927
 928         getboolfield(L, -1, "physical", prop->physical);
 929
 930         getfloatfield(L, -1, "weight", prop->weight);
 931
 932         lua_getfield(L, -1, "collisionbox");
 933         if(lua_istable(L, -1))
 934                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
 935         lua_pop(L, 1);
 936
 937         getstringfield(L, -1, "visual", prop->visual);
 938
 939         lua_getfield(L, -1, "visual_size");
 940         if(lua_istable(L, -1))
 941                 prop->visual_size = read_v2f(L, -1);
 942         lua_pop(L, 1);
 943
 944         lua_getfield(L, -1, "textures");
 945         if(lua_istable(L, -1)){
 946                 prop->textures.clear();
 947                 int table = lua_gettop(L);
 948                 lua_pushnil(L);
 949                 while(lua_next(L, table) != 0){
 950                         // key at index -2 and value at index -1
 951                         if(lua_isstring(L, -1))
 952                                 prop->textures.push_back(lua_tostring(L, -1));
 953                         else
 954                                 prop->textures.push_back("");
 955                         // removes value, keeps key for next iteration
 956                         lua_pop(L, 1);
 957                 }
 958         }
 959         lua_pop(L, 1);
 960
 961         lua_getfield(L, -1, "spritediv");
 962         if(lua_istable(L, -1))
 963                 prop->spritediv = read_v2s16(L, -1);
 964         lua_pop(L, 1);
 965
 966         lua_getfield(L, -1, "initial_sprite_basepos");
 967         if(lua_istable(L, -1))
 968                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 969         lua_pop(L, 1);
 970
 971         getboolfield(L, -1, "is_visible", prop->is_visible);
 972         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 973         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 974 }
 975
 976 /*
 977         ItemDefinition
 978 */
 979
 980 static ItemDefinition read_item_definition(lua_State *L, int index,
 981                 ItemDefinition default_def = ItemDefinition())
 982 {
 983         if(index < 0)
 984                 index = lua_gettop(L) + 1 + index;
 985
 986         // Read the item definition
 987         ItemDefinition def = default_def;
 988
 989         def.type = (ItemType)getenumfield(L, index, "type",
 990                         es_ItemType, ITEM_NONE);
 991         getstringfield(L, index, "name", def.name);
 992         getstringfield(L, index, "description", def.description);
 993         getstringfield(L, index, "inventory_image", def.inventory_image);
 994         getstringfield(L, index, "wield_image", def.wield_image);
 995
 996         lua_getfield(L, index, "wield_scale");
 997         if(lua_istable(L, -1)){
 998                 def.wield_scale = check_v3f(L, -1);
 999         }
1000         lua_pop(L, 1);
1001
1002         def.stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
1003         if(def.stack_max == 0)
1004                 def.stack_max = 1;
1005
1006         lua_getfield(L, index, "on_use");
1007         def.usable = lua_isfunction(L, -1);
1008         lua_pop(L, 1);
1009
1010         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
1011
1012         warn_if_field_exists(L, index, "tool_digging_properties",
1013                         "deprecated: use tool_capabilities");
1014
1015         lua_getfield(L, index, "tool_capabilities");
1016         if(lua_istable(L, -1)){
1017                 def.tool_capabilities = new ToolCapabilities(
1018                                 read_tool_capabilities(L, -1));
1019         }
1020
1021         // If name is "" (hand), ensure there are ToolCapabilities
1022         // because it will be looked up there whenever any other item has
1023         // no ToolCapabilities
1024         if(def.name == "" && def.tool_capabilities == NULL){
1025                 def.tool_capabilities = new ToolCapabilities();
1026         }
1027
1028         lua_getfield(L, index, "groups");
1029         read_groups(L, -1, def.groups);
1030         lua_pop(L, 1);
1031
1032         // Client shall immediately place this node when player places the item.
1033         // Server will update the precise end result a moment later.
1034         // "" = no prediction
1035         getstringfield(L, index, "node_placement_prediction",
1036                         def.node_placement_prediction);
1037
1038         return def;
1039 }
1040
1041 /*
1042         TileDef
1043 */
1044
1045 static TileDef read_tiledef(lua_State *L, int index)
1046 {
1047         if(index < 0)
1048                 index = lua_gettop(L) + 1 + index;
1049
1050         TileDef tiledef;
1051
1052         // key at index -2 and value at index
1053         if(lua_isstring(L, index)){
1054                 // "default_lava.png"
1055                 tiledef.name = lua_tostring(L, index);
1056         }
1057         else if(lua_istable(L, index))
1058         {
1059                 // {name="default_lava.png", animation={}}
1060                 tiledef.name = "";
1061                 getstringfield(L, index, "name", tiledef.name);
1062                 getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
1063                 tiledef.backface_culling = getboolfield_default(
1064                                         L, index, "backface_culling", true);
1065                 // animation = {}
1066                 lua_getfield(L, index, "animation");
1067                 if(lua_istable(L, -1)){
1068                         // {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
1069                         tiledef.animation.type = (TileAnimationType)
1070                                         getenumfield(L, -1, "type", es_TileAnimationType,
1071                                         TAT_NONE);
1072                         tiledef.animation.aspect_w =
1073                                         getintfield_default(L, -1, "aspect_w", 16);
1074                         tiledef.animation.aspect_h =
1075                                         getintfield_default(L, -1, "aspect_h", 16);
1076                         tiledef.animation.length =
1077                                         getfloatfield_default(L, -1, "length", 1.0);
1078                 }
1079                 lua_pop(L, 1);
1080         }
1081
1082         return tiledef;
1083 }
1084
1085 /*
1086         ContentFeatures
1087 */
1088
1089 static ContentFeatures read_content_features(lua_State *L, int index)
1090 {
1091         if(index < 0)
1092                 index = lua_gettop(L) + 1 + index;
1093
1094         ContentFeatures f;
1095
1096         /* Cache existence of some callbacks */
1097         lua_getfield(L, index, "on_construct");
1098         if(!lua_isnil(L, -1)) f.has_on_construct = true;
1099         lua_pop(L, 1);
1100         lua_getfield(L, index, "on_destruct");
1101         if(!lua_isnil(L, -1)) f.has_on_destruct = true;
1102         lua_pop(L, 1);
1103         lua_getfield(L, index, "after_destruct");
1104         if(!lua_isnil(L, -1)) f.has_after_destruct = true;
1105         lua_pop(L, 1);
1106
1107         /* Name */
1108         getstringfield(L, index, "name", f.name);
1109
1110         /* Groups */
1111         lua_getfield(L, index, "groups");
1112         read_groups(L, -1, f.groups);
1113         lua_pop(L, 1);
1114
1115         /* Visual definition */
1116
1117         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype", es_DrawType,
1118                         NDT_NORMAL);
1119         getfloatfield(L, index, "visual_scale", f.visual_scale);
1120
1121         // tiles = {}
1122         lua_getfield(L, index, "tiles");
1123         // If nil, try the deprecated name "tile_images" instead
1124         if(lua_isnil(L, -1)){
1125                 lua_pop(L, 1);
1126                 warn_if_field_exists(L, index, "tile_images",
1127                                 "Deprecated; new name is \"tiles\".");
1128                 lua_getfield(L, index, "tile_images");
1129         }
1130         if(lua_istable(L, -1)){
1131                 int table = lua_gettop(L);
1132                 lua_pushnil(L);
1133                 int i = 0;
1134                 while(lua_next(L, table) != 0){
1135                         // Read tiledef from value
1136                         f.tiledef[i] = read_tiledef(L, -1);
1137                         // removes value, keeps key for next iteration
1138                         lua_pop(L, 1);
1139                         i++;
1140                         if(i==6){
1141                                 lua_pop(L, 1);
1142                                 break;
1143                         }
1144                 }
1145                 // Copy last value to all remaining textures
1146                 if(i >= 1){
1147                         TileDef lasttile = f.tiledef[i-1];
1148                         while(i < 6){
1149                                 f.tiledef[i] = lasttile;
1150                                 i++;
1151                         }
1152                 }
1153         }
1154         lua_pop(L, 1);
1155
1156         // special_tiles = {}
1157         lua_getfield(L, index, "special_tiles");
1158         // If nil, try the deprecated name "special_materials" instead
1159         if(lua_isnil(L, -1)){
1160                 lua_pop(L, 1);
1161                 warn_if_field_exists(L, index, "special_materials",
1162                                 "Deprecated; new name is \"special_tiles\".");
1163                 lua_getfield(L, index, "special_materials");
1164         }
1165         if(lua_istable(L, -1)){
1166                 int table = lua_gettop(L);
1167                 lua_pushnil(L);
1168                 int i = 0;
1169                 while(lua_next(L, table) != 0){
1170                         // Read tiledef from value
1171                         f.tiledef_special[i] = read_tiledef(L, -1);
1172                         // removes value, keeps key for next iteration
1173                         lua_pop(L, 1);
1174                         i++;
1175                         if(i==6){
1176                                 lua_pop(L, 1);
1177                                 break;
1178                         }
1179                 }
1180         }
1181         lua_pop(L, 1);
1182
1183         f.alpha = getintfield_default(L, index, "alpha", 255);
1184
1185         /* Other stuff */
1186
1187         lua_getfield(L, index, "post_effect_color");
1188         if(!lua_isnil(L, -1))
1189                 f.post_effect_color = readARGB8(L, -1);
1190         lua_pop(L, 1);
1191
1192         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
1193                         es_ContentParamType, CPT_NONE);
1194         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
1195                         es_ContentParamType2, CPT2_NONE);
1196
1197         // Warn about some deprecated fields
1198         warn_if_field_exists(L, index, "wall_mounted",
1199                         "deprecated: use paramtype2 = 'wallmounted'");
1200         warn_if_field_exists(L, index, "light_propagates",
1201                         "deprecated: determined from paramtype");
1202         warn_if_field_exists(L, index, "dug_item",
1203                         "deprecated: use 'drop' field");
1204         warn_if_field_exists(L, index, "extra_dug_item",
1205                         "deprecated: use 'drop' field");
1206         warn_if_field_exists(L, index, "extra_dug_item_rarity",
1207                         "deprecated: use 'drop' field");
1208         warn_if_field_exists(L, index, "metadata_name",
1209                         "deprecated: use on_add and metadata callbacks");
1210
1211         // True for all ground-like things like stone and mud, false for eg. trees
1212         getboolfield(L, index, "is_ground_content", f.is_ground_content);
1213         f.light_propagates = (f.param_type == CPT_LIGHT);
1214         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
1215         // This is used for collision detection.
1216         // Also for general solidness queries.
1217         getboolfield(L, index, "walkable", f.walkable);
1218         // Player can point to these
1219         getboolfield(L, index, "pointable", f.pointable);
1220         // Player can dig these
1221         getboolfield(L, index, "diggable", f.diggable);
1222         // Player can climb these
1223         getboolfield(L, index, "climbable", f.climbable);
1224         // Player can build on these
1225         getboolfield(L, index, "buildable_to", f.buildable_to);
1226         // Whether the node is non-liquid, source liquid or flowing liquid
1227         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
1228                         es_LiquidType, LIQUID_NONE);
1229         // If the content is liquid, this is the flowing version of the liquid.
1230         getstringfield(L, index, "liquid_alternative_flowing",
1231                         f.liquid_alternative_flowing);
1232         // If the content is liquid, this is the source version of the liquid.
1233         getstringfield(L, index, "liquid_alternative_source",
1234                         f.liquid_alternative_source);
1235         // Viscosity for fluid flow, ranging from 1 to 7, with
1236         // 1 giving almost instantaneous propagation and 7 being
1237         // the slowest possible
1238         f.liquid_viscosity = getintfield_default(L, index,
1239                         "liquid_viscosity", f.liquid_viscosity);
1240         // Amount of light the node emits
1241         f.light_source = getintfield_default(L, index,
1242                         "light_source", f.light_source);
1243         f.damage_per_second = getintfield_default(L, index,
1244                         "damage_per_second", f.damage_per_second);
1245
1246         lua_getfield(L, index, "node_box");
1247         if(lua_istable(L, -1))
1248                 f.node_box = read_nodebox(L, -1);
1249         lua_pop(L, 1);
1250
1251         lua_getfield(L, index, "selection_box");
1252         if(lua_istable(L, -1))
1253                 f.selection_box = read_nodebox(L, -1);
1254         lua_pop(L, 1);
1255
1256         // Set to true if paramtype used to be 'facedir_simple'
1257         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
1258         // Set to true if wall_mounted used to be set to true
1259         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
1260
1261         // Sound table
1262         lua_getfield(L, index, "sounds");
1263         if(lua_istable(L, -1)){
1264                 lua_getfield(L, -1, "footstep");
1265                 read_soundspec(L, -1, f.sound_footstep);
1266                 lua_pop(L, 1);
1267                 lua_getfield(L, -1, "dig");
1268                 read_soundspec(L, -1, f.sound_dig);
1269                 lua_pop(L, 1);
1270                 lua_getfield(L, -1, "dug");
1271                 read_soundspec(L, -1, f.sound_dug);
1272                 lua_pop(L, 1);
1273         }
1274         lua_pop(L, 1);
1275
1276         return f;
1277 }
1278
1279 /*
1280         Inventory stuff
1281 */
1282
1283 static ItemStack read_item(lua_State *L, int index);
1284 static std::vector<ItemStack> read_items(lua_State *L, int index);
1285 // creates a table of ItemStacks
1286 static void push_items(lua_State *L, const std::vector<ItemStack> &items);
1287
1288 static void inventory_set_list_from_lua(Inventory *inv, const char *name,
1289                 lua_State *L, int tableindex, int forcesize=-1)
1290 {
1291         if(tableindex < 0)
1292                 tableindex = lua_gettop(L) + 1 + tableindex;
1293         // If nil, delete list
1294         if(lua_isnil(L, tableindex)){
1295                 inv->deleteList(name);
1296                 return;
1297         }
1298         // Otherwise set list
1299         std::vector<ItemStack> items = read_items(L, tableindex);
1300         int listsize = (forcesize != -1) ? forcesize : items.size();
1301         InventoryList *invlist = inv->addList(name, listsize);
1302         int index = 0;
1303         for(std::vector<ItemStack>::const_iterator
1304                         i = items.begin(); i != items.end(); i++){
1305                 if(forcesize != -1 && index == forcesize)
1306                         break;
1307                 invlist->changeItem(index, *i);
1308                 index++;
1309         }
1310         while(forcesize != -1 && index < forcesize){
1311                 invlist->deleteItem(index);
1312                 index++;
1313         }
1314 }
1315
1316 static void inventory_get_list_to_lua(Inventory *inv, const char *name,
1317                 lua_State *L)
1318 {
1319         InventoryList *invlist = inv->getList(name);
1320         if(invlist == NULL){
1321                 lua_pushnil(L);
1322                 return;
1323         }
1324         std::vector<ItemStack> items;
1325         for(u32 i=0; i<invlist->getSize(); i++)
1326                 items.push_back(invlist->getItem(i));
1327         push_items(L, items);
1328 }
1329
1330 /*
1331         Helpful macros for userdata classes
1332 */
1333
1334 #define method(class, name) {#name, class::l_##name}
1335
1336 /*
1337         LuaItemStack
1338 */
1339
1340 class LuaItemStack
1341 {
1342 private:
1343         ItemStack m_stack;
1344
1345         static const char className[];
1346         static const luaL_reg methods[];
1347
1348         // Exported functions
1349
1350         // garbage collector
1351         static int gc_object(lua_State *L)
1352         {
1353                 LuaItemStack *o = *(LuaItemStack **)(lua_touserdata(L, 1));
1354                 delete o;
1355                 return 0;
1356         }
1357
1358         // is_empty(self) -> true/false
1359         static int l_is_empty(lua_State *L)
1360         {
1361                 LuaItemStack *o = checkobject(L, 1);
1362                 ItemStack &item = o->m_stack;
1363                 lua_pushboolean(L, item.empty());
1364                 return 1;
1365         }
1366
1367         // get_name(self) -> string
1368         static int l_get_name(lua_State *L)
1369         {
1370                 LuaItemStack *o = checkobject(L, 1);
1371                 ItemStack &item = o->m_stack;
1372                 lua_pushstring(L, item.name.c_str());
1373                 return 1;
1374         }
1375
1376         // get_count(self) -> number
1377         static int l_get_count(lua_State *L)
1378         {
1379                 LuaItemStack *o = checkobject(L, 1);
1380                 ItemStack &item = o->m_stack;
1381                 lua_pushinteger(L, item.count);
1382                 return 1;
1383         }
1384
1385         // get_wear(self) -> number
1386         static int l_get_wear(lua_State *L)
1387         {
1388                 LuaItemStack *o = checkobject(L, 1);
1389                 ItemStack &item = o->m_stack;
1390                 lua_pushinteger(L, item.wear);
1391                 return 1;
1392         }
1393
1394         // get_metadata(self) -> string
1395         static int l_get_metadata(lua_State *L)
1396         {
1397                 LuaItemStack *o = checkobject(L, 1);
1398                 ItemStack &item = o->m_stack;
1399                 lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
1400                 return 1;
1401         }
1402
1403         // clear(self) -> true
1404         static int l_clear(lua_State *L)
1405         {
1406                 LuaItemStack *o = checkobject(L, 1);
1407                 o->m_stack.clear();
1408                 lua_pushboolean(L, true);
1409                 return 1;
1410         }
1411
1412         // replace(self, itemstack or itemstring or table or nil) -> true
1413         static int l_replace(lua_State *L)
1414         {
1415                 LuaItemStack *o = checkobject(L, 1);
1416                 o->m_stack = read_item(L, 2);
1417                 lua_pushboolean(L, true);
1418                 return 1;
1419         }
1420
1421         // to_string(self) -> string
1422         static int l_to_string(lua_State *L)
1423         {
1424                 LuaItemStack *o = checkobject(L, 1);
1425                 std::string itemstring = o->m_stack.getItemString();
1426                 lua_pushstring(L, itemstring.c_str());
1427                 return 1;
1428         }
1429
1430         // to_table(self) -> table or nil
1431         static int l_to_table(lua_State *L)
1432         {
1433                 LuaItemStack *o = checkobject(L, 1);
1434                 const ItemStack &item = o->m_stack;
1435                 if(item.empty())
1436                 {
1437                         lua_pushnil(L);
1438                 }
1439                 else
1440                 {
1441                         lua_newtable(L);
1442                         lua_pushstring(L, item.name.c_str());
1443                         lua_setfield(L, -2, "name");
1444                         lua_pushinteger(L, item.count);
1445                         lua_setfield(L, -2, "count");
1446                         lua_pushinteger(L, item.wear);
1447                         lua_setfield(L, -2, "wear");
1448                         lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
1449                         lua_setfield(L, -2, "metadata");
1450                 }
1451                 return 1;
1452         }
1453
1454         // get_stack_max(self) -> number
1455         static int l_get_stack_max(lua_State *L)
1456         {
1457                 LuaItemStack *o = checkobject(L, 1);
1458                 ItemStack &item = o->m_stack;
1459                 lua_pushinteger(L, item.getStackMax(get_server(L)->idef()));
1460                 return 1;
1461         }
1462
1463         // get_free_space(self) -> number
1464         static int l_get_free_space(lua_State *L)
1465         {
1466                 LuaItemStack *o = checkobject(L, 1);
1467                 ItemStack &item = o->m_stack;
1468                 lua_pushinteger(L, item.freeSpace(get_server(L)->idef()));
1469                 return 1;
1470         }
1471
1472         // is_known(self) -> true/false
1473         // Checks if the item is defined.
1474         static int l_is_known(lua_State *L)
1475         {
1476                 LuaItemStack *o = checkobject(L, 1);
1477                 ItemStack &item = o->m_stack;
1478                 bool is_known = item.isKnown(get_server(L)->idef());
1479                 lua_pushboolean(L, is_known);
1480                 return 1;
1481         }
1482
1483         // get_definition(self) -> table
1484         // Returns the item definition table from minetest.registered_items,
1485         // or a fallback one (name="unknown")
1486         static int l_get_definition(lua_State *L)
1487         {
1488                 LuaItemStack *o = checkobject(L, 1);
1489                 ItemStack &item = o->m_stack;
1490
1491                 // Get minetest.registered_items[name]
1492                 lua_getglobal(L, "minetest");
1493                 lua_getfield(L, -1, "registered_items");
1494                 luaL_checktype(L, -1, LUA_TTABLE);
1495                 lua_getfield(L, -1, item.name.c_str());
1496                 if(lua_isnil(L, -1))
1497                 {
1498                         lua_pop(L, 1);
1499                         lua_getfield(L, -1, "unknown");
1500                 }
1501                 return 1;
1502         }
1503
1504         // get_tool_capabilities(self) -> table
1505         // Returns the effective tool digging properties.
1506         // Returns those of the hand ("") if this item has none associated.
1507         static int l_get_tool_capabilities(lua_State *L)
1508         {
1509                 LuaItemStack *o = checkobject(L, 1);
1510                 ItemStack &item = o->m_stack;
1511                 const ToolCapabilities &prop =
1512                         item.getToolCapabilities(get_server(L)->idef());
1513                 push_tool_capabilities(L, prop);
1514                 return 1;
1515         }
1516
1517         // add_wear(self, amount) -> true/false
1518         // The range for "amount" is [0,65535]. Wear is only added if the item
1519         // is a tool. Adding wear might destroy the item.
1520         // Returns true if the item is (or was) a tool.
1521         static int l_add_wear(lua_State *L)
1522         {
1523                 LuaItemStack *o = checkobject(L, 1);
1524                 ItemStack &item = o->m_stack;
1525                 int amount = lua_tointeger(L, 2);
1526                 bool result = item.addWear(amount, get_server(L)->idef());
1527                 lua_pushboolean(L, result);
1528                 return 1;
1529         }
1530
1531         // add_item(self, itemstack or itemstring or table or nil) -> itemstack
1532         // Returns leftover item stack
1533         static int l_add_item(lua_State *L)
1534         {
1535                 LuaItemStack *o = checkobject(L, 1);
1536                 ItemStack &item = o->m_stack;
1537                 ItemStack newitem = read_item(L, 2);
1538                 ItemStack leftover = item.addItem(newitem, get_server(L)->idef());
1539                 create(L, leftover);
1540                 return 1;
1541         }
1542
1543         // item_fits(self, itemstack or itemstring or table or nil) -> true/false, itemstack
1544         // First return value is true iff the new item fits fully into the stack
1545         // Second return value is the would-be-left-over item stack
1546         static int l_item_fits(lua_State *L)
1547         {
1548                 LuaItemStack *o = checkobject(L, 1);
1549                 ItemStack &item = o->m_stack;
1550                 ItemStack newitem = read_item(L, 2);
1551                 ItemStack restitem;
1552                 bool fits = item.itemFits(newitem, &restitem, get_server(L)->idef());
1553                 lua_pushboolean(L, fits);  // first return value
1554                 create(L, restitem);       // second return value
1555                 return 2;
1556         }
1557
1558         // take_item(self, takecount=1) -> itemstack
1559         static int l_take_item(lua_State *L)
1560         {
1561                 LuaItemStack *o = checkobject(L, 1);
1562                 ItemStack &item = o->m_stack;
1563                 u32 takecount = 1;
1564                 if(!lua_isnone(L, 2))
1565                         takecount = luaL_checkinteger(L, 2);
1566                 ItemStack taken = item.takeItem(takecount);
1567                 create(L, taken);
1568                 return 1;
1569         }
1570
1571         // peek_item(self, peekcount=1) -> itemstack
1572         static int l_peek_item(lua_State *L)
1573         {
1574                 LuaItemStack *o = checkobject(L, 1);
1575                 ItemStack &item = o->m_stack;
1576                 u32 peekcount = 1;
1577                 if(!lua_isnone(L, 2))
1578                         peekcount = lua_tointeger(L, 2);
1579                 ItemStack peekaboo = item.peekItem(peekcount);
1580                 create(L, peekaboo);
1581                 return 1;
1582         }
1583
1584 public:
1585         LuaItemStack(const ItemStack &item):
1586                 m_stack(item)
1587         {
1588         }
1589
1590         ~LuaItemStack()
1591         {
1592         }
1593
1594         const ItemStack& getItem() const
1595         {
1596                 return m_stack;
1597         }
1598         ItemStack& getItem()
1599         {
1600                 return m_stack;
1601         }
1602
1603         // LuaItemStack(itemstack or itemstring or table or nil)
1604         // Creates an LuaItemStack and leaves it on top of stack
1605         static int create_object(lua_State *L)
1606         {
1607                 ItemStack item = read_item(L, 1);
1608                 LuaItemStack *o = new LuaItemStack(item);
1609                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1610                 luaL_getmetatable(L, className);
1611                 lua_setmetatable(L, -2);
1612                 return 1;
1613         }
1614         // Not callable from Lua
1615         static int create(lua_State *L, const ItemStack &item)
1616         {
1617                 LuaItemStack *o = new LuaItemStack(item);
1618                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1619                 luaL_getmetatable(L, className);
1620                 lua_setmetatable(L, -2);
1621                 return 1;
1622         }
1623
1624         static LuaItemStack* checkobject(lua_State *L, int narg)
1625         {
1626                 luaL_checktype(L, narg, LUA_TUSERDATA);
1627                 void *ud = luaL_checkudata(L, narg, className);
1628                 if(!ud) luaL_typerror(L, narg, className);
1629                 return *(LuaItemStack**)ud;  // unbox pointer
1630         }
1631
1632         static void Register(lua_State *L)
1633         {
1634                 lua_newtable(L);
1635                 int methodtable = lua_gettop(L);
1636                 luaL_newmetatable(L, className);
1637                 int metatable = lua_gettop(L);
1638
1639                 lua_pushliteral(L, "__metatable");
1640                 lua_pushvalue(L, methodtable);
1641                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
1642
1643                 lua_pushliteral(L, "__index");
1644                 lua_pushvalue(L, methodtable);
1645                 lua_settable(L, metatable);
1646
1647                 lua_pushliteral(L, "__gc");
1648                 lua_pushcfunction(L, gc_object);
1649                 lua_settable(L, metatable);
1650
1651                 lua_pop(L, 1);  // drop metatable
1652
1653                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
1654                 lua_pop(L, 1);  // drop methodtable
1655
1656                 // Can be created from Lua (LuaItemStack(itemstack or itemstring or table or nil))
1657                 lua_register(L, className, create_object);
1658         }
1659 };
1660 const char LuaItemStack::className[] = "ItemStack";
1661 const luaL_reg LuaItemStack::methods[] = {
1662         method(LuaItemStack, is_empty),
1663         method(LuaItemStack, get_name),
1664         method(LuaItemStack, get_count),
1665         method(LuaItemStack, get_wear),
1666         method(LuaItemStack, get_metadata),
1667         method(LuaItemStack, clear),
1668         method(LuaItemStack, replace),
1669         method(LuaItemStack, to_string),
1670         method(LuaItemStack, to_table),
1671         method(LuaItemStack, get_stack_max),
1672         method(LuaItemStack, get_free_space),
1673         method(LuaItemStack, is_known),
1674         method(LuaItemStack, get_definition),
1675         method(LuaItemStack, get_tool_capabilities),
1676         method(LuaItemStack, add_wear),
1677         method(LuaItemStack, add_item),
1678         method(LuaItemStack, item_fits),
1679         method(LuaItemStack, take_item),
1680         method(LuaItemStack, peek_item),
1681         {0,0}
1682 };
1683
1684 static ItemStack read_item(lua_State *L, int index)
1685 {
1686         if(index < 0)
1687                 index = lua_gettop(L) + 1 + index;
1688
1689         if(lua_isnil(L, index))
1690         {
1691                 return ItemStack();
1692         }
1693         else if(lua_isuserdata(L, index))
1694         {
1695                 // Convert from LuaItemStack
1696                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
1697                 return o->getItem();
1698         }
1699         else if(lua_isstring(L, index))
1700         {
1701                 // Convert from itemstring
1702                 std::string itemstring = lua_tostring(L, index);
1703                 IItemDefManager *idef = get_server(L)->idef();
1704                 try
1705                 {
1706                         ItemStack item;
1707                         item.deSerialize(itemstring, idef);
1708                         return item;
1709                 }
1710                 catch(SerializationError &e)
1711                 {
1712                         infostream<<"WARNING: unable to create item from itemstring"
1713                                         <<": "<<itemstring<<std::endl;
1714                         return ItemStack();
1715                 }
1716         }
1717         else if(lua_istable(L, index))
1718         {
1719                 // Convert from table
1720                 IItemDefManager *idef = get_server(L)->idef();
1721                 std::string name = getstringfield_default(L, index, "name", "");
1722                 int count = getintfield_default(L, index, "count", 1);
1723                 int wear = getintfield_default(L, index, "wear", 0);
1724                 std::string metadata = getstringfield_default(L, index, "metadata", "");
1725                 return ItemStack(name, count, wear, metadata, idef);
1726         }
1727         else
1728         {
1729                 throw LuaError(L, "Expecting itemstack, itemstring, table or nil");
1730         }
1731 }
1732
1733 static std::vector<ItemStack> read_items(lua_State *L, int index)
1734 {
1735         if(index < 0)
1736                 index = lua_gettop(L) + 1 + index;
1737
1738         std::vector<ItemStack> items;
1739         luaL_checktype(L, index, LUA_TTABLE);
1740         lua_pushnil(L);
1741         while(lua_next(L, index) != 0){
1742                 // key at index -2 and value at index -1
1743                 items.push_back(read_item(L, -1));
1744                 // removes value, keeps key for next iteration
1745                 lua_pop(L, 1);
1746         }
1747         return items;
1748 }
1749
1750 // creates a table of ItemStacks
1751 static void push_items(lua_State *L, const std::vector<ItemStack> &items)
1752 {
1753         // Get the table insert function
1754         lua_getglobal(L, "table");
1755         lua_getfield(L, -1, "insert");
1756         int table_insert = lua_gettop(L);
1757         // Create and fill table
1758         lua_newtable(L);
1759         int table = lua_gettop(L);
1760         for(u32 i=0; i<items.size(); i++){
1761                 ItemStack item = items[i];
1762                 lua_pushvalue(L, table_insert);
1763                 lua_pushvalue(L, table);
1764                 LuaItemStack::create(L, item);
1765                 if(lua_pcall(L, 2, 0, 0))
1766                         script_error(L, "error: %s", lua_tostring(L, -1));
1767         }
1768         lua_remove(L, -2); // Remove table
1769         lua_remove(L, -2); // Remove insert
1770 }
1771
1772 /*
1773         InvRef
1774 */
1775
1776 class InvRef
1777 {
1778 private:
1779         InventoryLocation m_loc;
1780
1781         static const char className[];
1782         static const luaL_reg methods[];
1783
1784         static InvRef *checkobject(lua_State *L, int narg)
1785         {
1786                 luaL_checktype(L, narg, LUA_TUSERDATA);
1787                 void *ud = luaL_checkudata(L, narg, className);
1788                 if(!ud) luaL_typerror(L, narg, className);
1789                 return *(InvRef**)ud;  // unbox pointer
1790         }
1791
1792         static Inventory* getinv(lua_State *L, InvRef *ref)
1793         {
1794                 return get_server(L)->getInventory(ref->m_loc);
1795         }
1796
1797         static InventoryList* getlist(lua_State *L, InvRef *ref,
1798                         const char *listname)
1799         {
1800                 Inventory *inv = getinv(L, ref);
1801                 if(!inv)
1802                         return NULL;
1803                 return inv->getList(listname);
1804         }
1805
1806         static void reportInventoryChange(lua_State *L, InvRef *ref)
1807         {
1808                 // Inform other things that the inventory has changed
1809                 get_server(L)->setInventoryModified(ref->m_loc);
1810         }
1811
1812         // Exported functions
1813
1814         // garbage collector
1815         static int gc_object(lua_State *L) {
1816                 InvRef *o = *(InvRef **)(lua_touserdata(L, 1));
1817                 delete o;
1818                 return 0;
1819         }
1820
1821         // is_empty(self, listname) -> true/false
1822         static int l_is_empty(lua_State *L)
1823         {
1824                 InvRef *ref = checkobject(L, 1);
1825                 const char *listname = luaL_checkstring(L, 2);
1826                 InventoryList *list = getlist(L, ref, listname);
1827                 if(list && list->getUsedSlots() > 0){
1828                         lua_pushboolean(L, false);
1829                 } else {
1830                         lua_pushboolean(L, true);
1831                 }
1832                 return 1;
1833         }
1834
1835         // get_size(self, listname)
1836         static int l_get_size(lua_State *L)
1837         {
1838                 InvRef *ref = checkobject(L, 1);
1839                 const char *listname = luaL_checkstring(L, 2);
1840                 InventoryList *list = getlist(L, ref, listname);
1841                 if(list){
1842                         lua_pushinteger(L, list->getSize());
1843                 } else {
1844                         lua_pushinteger(L, 0);
1845                 }
1846                 return 1;
1847         }
1848
1849         // set_size(self, listname, size)
1850         static int l_set_size(lua_State *L)
1851         {
1852                 InvRef *ref = checkobject(L, 1);
1853                 const char *listname = luaL_checkstring(L, 2);
1854                 int newsize = luaL_checknumber(L, 3);
1855                 Inventory *inv = getinv(L, ref);
1856                 if(newsize == 0){
1857                         inv->deleteList(listname);
1858                         reportInventoryChange(L, ref);
1859                         return 0;
1860                 }
1861                 InventoryList *list = inv->getList(listname);
1862                 if(list){
1863                         list->setSize(newsize);
1864                 } else {
1865                         list = inv->addList(listname, newsize);
1866                 }
1867                 reportInventoryChange(L, ref);
1868                 return 0;
1869         }
1870
1871         // get_stack(self, listname, i) -> itemstack
1872         static int l_get_stack(lua_State *L)
1873         {
1874                 InvRef *ref = checkobject(L, 1);
1875                 const char *listname = luaL_checkstring(L, 2);
1876                 int i = luaL_checknumber(L, 3) - 1;
1877                 InventoryList *list = getlist(L, ref, listname);
1878                 ItemStack item;
1879                 if(list != NULL && i >= 0 && i < (int) list->getSize())
1880                         item = list->getItem(i);
1881                 LuaItemStack::create(L, item);
1882                 return 1;
1883         }
1884
1885         // set_stack(self, listname, i, stack) -> true/false
1886         static int l_set_stack(lua_State *L)
1887         {
1888                 InvRef *ref = checkobject(L, 1);
1889                 const char *listname = luaL_checkstring(L, 2);
1890                 int i = luaL_checknumber(L, 3) - 1;
1891                 ItemStack newitem = read_item(L, 4);
1892                 InventoryList *list = getlist(L, ref, listname);
1893                 if(list != NULL && i >= 0 && i < (int) list->getSize()){
1894                         list->changeItem(i, newitem);
1895                         reportInventoryChange(L, ref);
1896                         lua_pushboolean(L, true);
1897                 } else {
1898                         lua_pushboolean(L, false);
1899                 }
1900                 return 1;
1901         }
1902
1903         // get_list(self, listname) -> list or nil
1904         static int l_get_list(lua_State *L)
1905         {
1906                 InvRef *ref = checkobject(L, 1);
1907                 const char *listname = luaL_checkstring(L, 2);
1908                 Inventory *inv = getinv(L, ref);
1909                 inventory_get_list_to_lua(inv, listname, L);
1910                 return 1;
1911         }
1912
1913         // set_list(self, listname, list)
1914         static int l_set_list(lua_State *L)
1915         {
1916                 InvRef *ref = checkobject(L, 1);
1917                 const char *listname = luaL_checkstring(L, 2);
1918                 Inventory *inv = getinv(L, ref);
1919                 InventoryList *list = inv->getList(listname);
1920                 if(list)
1921                         inventory_set_list_from_lua(inv, listname, L, 3,
1922                                         list->getSize());
1923                 else
1924                         inventory_set_list_from_lua(inv, listname, L, 3);
1925                 reportInventoryChange(L, ref);
1926                 return 0;
1927         }
1928
1929         // add_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
1930         // Returns the leftover stack
1931         static int l_add_item(lua_State *L)
1932         {
1933                 InvRef *ref = checkobject(L, 1);
1934                 const char *listname = luaL_checkstring(L, 2);
1935                 ItemStack item = read_item(L, 3);
1936                 InventoryList *list = getlist(L, ref, listname);
1937                 if(list){
1938                         ItemStack leftover = list->addItem(item);
1939                         if(leftover.count != item.count)
1940                                 reportInventoryChange(L, ref);
1941                         LuaItemStack::create(L, leftover);
1942                 } else {
1943                         LuaItemStack::create(L, item);
1944                 }
1945                 return 1;
1946         }
1947
1948         // room_for_item(self, listname, itemstack or itemstring or table or nil) -> true/false
1949         // Returns true if the item completely fits into the list
1950         static int l_room_for_item(lua_State *L)
1951         {
1952                 InvRef *ref = checkobject(L, 1);
1953                 const char *listname = luaL_checkstring(L, 2);
1954                 ItemStack item = read_item(L, 3);
1955                 InventoryList *list = getlist(L, ref, listname);
1956                 if(list){
1957                         lua_pushboolean(L, list->roomForItem(item));
1958                 } else {
1959                         lua_pushboolean(L, false);
1960                 }
1961                 return 1;
1962         }
1963
1964         // contains_item(self, listname, itemstack or itemstring or table or nil) -> true/false
1965         // Returns true if the list contains the given count of the given item name
1966         static int l_contains_item(lua_State *L)
1967         {
1968                 InvRef *ref = checkobject(L, 1);
1969                 const char *listname = luaL_checkstring(L, 2);
1970                 ItemStack item = read_item(L, 3);
1971                 InventoryList *list = getlist(L, ref, listname);
1972                 if(list){
1973                         lua_pushboolean(L, list->containsItem(item));
1974                 } else {
1975                         lua_pushboolean(L, false);
1976                 }
1977                 return 1;
1978         }
1979
1980         // remove_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
1981         // Returns the items that were actually removed
1982         static int l_remove_item(lua_State *L)
1983         {
1984                 InvRef *ref = checkobject(L, 1);
1985                 const char *listname = luaL_checkstring(L, 2);
1986                 ItemStack item = read_item(L, 3);
1987                 InventoryList *list = getlist(L, ref, listname);
1988                 if(list){
1989                         ItemStack removed = list->removeItem(item);
1990                         if(!removed.empty())
1991                                 reportInventoryChange(L, ref);
1992                         LuaItemStack::create(L, removed);
1993                 } else {
1994                         LuaItemStack::create(L, ItemStack());
1995                 }
1996                 return 1;
1997         }
1998
1999 public:
2000         InvRef(const InventoryLocation &loc):
2001                 m_loc(loc)
2002         {
2003         }
2004
2005         ~InvRef()
2006         {
2007         }
2008
2009         // Creates an InvRef and leaves it on top of stack
2010         // Not callable from Lua; all references are created on the C side.
2011         static void create(lua_State *L, const InventoryLocation &loc)
2012         {
2013                 InvRef *o = new InvRef(loc);
2014                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2015                 luaL_getmetatable(L, className);
2016                 lua_setmetatable(L, -2);
2017         }
2018         static void createPlayer(lua_State *L, Player *player)
2019         {
2020                 InventoryLocation loc;
2021                 loc.setPlayer(player->getName());
2022                 create(L, loc);
2023         }
2024         static void createNodeMeta(lua_State *L, v3s16 p)
2025         {
2026                 InventoryLocation loc;
2027                 loc.setNodeMeta(p);
2028                 create(L, loc);
2029         }
2030
2031         static void Register(lua_State *L)
2032         {
2033                 lua_newtable(L);
2034                 int methodtable = lua_gettop(L);
2035                 luaL_newmetatable(L, className);
2036                 int metatable = lua_gettop(L);
2037
2038                 lua_pushliteral(L, "__metatable");
2039                 lua_pushvalue(L, methodtable);
2040                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2041
2042                 lua_pushliteral(L, "__index");
2043                 lua_pushvalue(L, methodtable);
2044                 lua_settable(L, metatable);
2045
2046                 lua_pushliteral(L, "__gc");
2047                 lua_pushcfunction(L, gc_object);
2048                 lua_settable(L, metatable);
2049
2050                 lua_pop(L, 1);  // drop metatable
2051
2052                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2053                 lua_pop(L, 1);  // drop methodtable
2054
2055                 // Cannot be created from Lua
2056                 //lua_register(L, className, create_object);
2057         }
2058 };
2059 const char InvRef::className[] = "InvRef";
2060 const luaL_reg InvRef::methods[] = {
2061         method(InvRef, is_empty),
2062         method(InvRef, get_size),
2063         method(InvRef, set_size),
2064         method(InvRef, get_stack),
2065         method(InvRef, set_stack),
2066         method(InvRef, get_list),
2067         method(InvRef, set_list),
2068         method(InvRef, add_item),
2069         method(InvRef, room_for_item),
2070         method(InvRef, contains_item),
2071         method(InvRef, remove_item),
2072         {0,0}
2073 };
2074
2075 /*
2076         NodeMetaRef
2077 */
2078
2079 class NodeMetaRef
2080 {
2081 private:
2082         v3s16 m_p;
2083         ServerEnvironment *m_env;
2084
2085         static const char className[];
2086         static const luaL_reg methods[];
2087
2088         static NodeMetaRef *checkobject(lua_State *L, int narg)
2089         {
2090                 luaL_checktype(L, narg, LUA_TUSERDATA);
2091                 void *ud = luaL_checkudata(L, narg, className);
2092                 if(!ud) luaL_typerror(L, narg, className);
2093                 return *(NodeMetaRef**)ud;  // unbox pointer
2094         }
2095
2096         static NodeMetadata* getmeta(NodeMetaRef *ref, bool auto_create)
2097         {
2098                 NodeMetadata *meta = ref->m_env->getMap().getNodeMetadata(ref->m_p);
2099                 if(meta == NULL && auto_create)
2100                 {
2101                         meta = new NodeMetadata(ref->m_env->getGameDef());
2102                         ref->m_env->getMap().setNodeMetadata(ref->m_p, meta);
2103                 }
2104                 return meta;
2105         }
2106
2107         static void reportMetadataChange(NodeMetaRef *ref)
2108         {
2109                 // Inform other things that the metadata has changed
2110                 v3s16 blockpos = getNodeBlockPos(ref->m_p);
2111                 MapEditEvent event;
2112                 event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
2113                 event.p = blockpos;
2114                 ref->m_env->getMap().dispatchEvent(&event);
2115                 // Set the block to be saved
2116                 MapBlock *block = ref->m_env->getMap().getBlockNoCreateNoEx(blockpos);
2117                 if(block)
2118                         block->raiseModified(MOD_STATE_WRITE_NEEDED,
2119                                         "NodeMetaRef::reportMetadataChange");
2120         }
2121
2122         // Exported functions
2123
2124         // garbage collector
2125         static int gc_object(lua_State *L) {
2126                 NodeMetaRef *o = *(NodeMetaRef **)(lua_touserdata(L, 1));
2127                 delete o;
2128                 return 0;
2129         }
2130
2131         // get_string(self, name)
2132         static int l_get_string(lua_State *L)
2133         {
2134                 NodeMetaRef *ref = checkobject(L, 1);
2135                 std::string name = luaL_checkstring(L, 2);
2136
2137                 NodeMetadata *meta = getmeta(ref, false);
2138                 if(meta == NULL){
2139                         lua_pushlstring(L, "", 0);
2140                         return 1;
2141                 }
2142                 std::string str = meta->getString(name);
2143                 lua_pushlstring(L, str.c_str(), str.size());
2144                 return 1;
2145         }
2146
2147         // set_string(self, name, var)
2148         static int l_set_string(lua_State *L)
2149         {
2150                 NodeMetaRef *ref = checkobject(L, 1);
2151                 std::string name = luaL_checkstring(L, 2);
2152                 size_t len = 0;
2153                 const char *s = lua_tolstring(L, 3, &len);
2154                 std::string str(s, len);
2155
2156                 NodeMetadata *meta = getmeta(ref, !str.empty());
2157                 if(meta == NULL || str == meta->getString(name))
2158                         return 0;
2159                 meta->setString(name, str);
2160                 reportMetadataChange(ref);
2161                 return 0;
2162         }
2163
2164         // get_int(self, name)
2165         static int l_get_int(lua_State *L)
2166         {
2167                 NodeMetaRef *ref = checkobject(L, 1);
2168                 std::string name = lua_tostring(L, 2);
2169
2170                 NodeMetadata *meta = getmeta(ref, false);
2171                 if(meta == NULL){
2172                         lua_pushnumber(L, 0);
2173                         return 1;
2174                 }
2175                 std::string str = meta->getString(name);
2176                 lua_pushnumber(L, stoi(str));
2177                 return 1;
2178         }
2179
2180         // set_int(self, name, var)
2181         static int l_set_int(lua_State *L)
2182         {
2183                 NodeMetaRef *ref = checkobject(L, 1);
2184                 std::string name = lua_tostring(L, 2);
2185                 int a = lua_tointeger(L, 3);
2186                 std::string str = itos(a);
2187
2188                 NodeMetadata *meta = getmeta(ref, true);
2189                 if(meta == NULL || str == meta->getString(name))
2190                         return 0;
2191                 meta->setString(name, str);
2192                 reportMetadataChange(ref);
2193                 return 0;
2194         }
2195
2196         // get_float(self, name)
2197         static int l_get_float(lua_State *L)
2198         {
2199                 NodeMetaRef *ref = checkobject(L, 1);
2200                 std::string name = lua_tostring(L, 2);
2201
2202                 NodeMetadata *meta = getmeta(ref, false);
2203                 if(meta == NULL){
2204                         lua_pushnumber(L, 0);
2205                         return 1;
2206                 }
2207                 std::string str = meta->getString(name);
2208                 lua_pushnumber(L, stof(str));
2209                 return 1;
2210         }
2211
2212         // set_float(self, name, var)
2213         static int l_set_float(lua_State *L)
2214         {
2215                 NodeMetaRef *ref = checkobject(L, 1);
2216                 std::string name = lua_tostring(L, 2);
2217                 float a = lua_tonumber(L, 3);
2218                 std::string str = ftos(a);
2219
2220                 NodeMetadata *meta = getmeta(ref, true);
2221                 if(meta == NULL || str == meta->getString(name))
2222                         return 0;
2223                 meta->setString(name, str);
2224                 reportMetadataChange(ref);
2225                 return 0;
2226         }
2227
2228         // get_inventory(self)
2229         static int l_get_inventory(lua_State *L)
2230         {
2231                 NodeMetaRef *ref = checkobject(L, 1);
2232                 getmeta(ref, true);  // try to ensure the metadata exists
2233                 InvRef::createNodeMeta(L, ref->m_p);
2234                 return 1;
2235         }
2236
2237         // to_table(self)
2238         static int l_to_table(lua_State *L)
2239         {
2240                 NodeMetaRef *ref = checkobject(L, 1);
2241
2242                 NodeMetadata *meta = getmeta(ref, true);
2243                 if(meta == NULL){
2244                         lua_pushnil(L);
2245                         return 1;
2246                 }
2247                 lua_newtable(L);
2248                 // fields
2249                 lua_newtable(L);
2250                 {
2251                         std::map<std::string, std::string> fields = meta->getStrings();
2252                         for(std::map<std::string, std::string>::const_iterator
2253                                         i = fields.begin(); i != fields.end(); i++){
2254                                 const std::string &name = i->first;
2255                                 const std::string &value = i->second;
2256                                 lua_pushlstring(L, name.c_str(), name.size());
2257                                 lua_pushlstring(L, value.c_str(), value.size());
2258                                 lua_settable(L, -3);
2259                         }
2260                 }
2261                 lua_setfield(L, -2, "fields");
2262                 // inventory
2263                 lua_newtable(L);
2264                 Inventory *inv = meta->getInventory();
2265                 if(inv){
2266                         std::vector<const InventoryList*> lists = inv->getLists();
2267                         for(std::vector<const InventoryList*>::const_iterator
2268                                         i = lists.begin(); i != lists.end(); i++){
2269                                 inventory_get_list_to_lua(inv, (*i)->getName().c_str(), L);
2270                                 lua_setfield(L, -2, (*i)->getName().c_str());
2271                         }
2272                 }
2273                 lua_setfield(L, -2, "inventory");
2274                 return 1;
2275         }
2276
2277         // from_table(self, table)
2278         static int l_from_table(lua_State *L)
2279         {
2280                 NodeMetaRef *ref = checkobject(L, 1);
2281                 int base = 2;
2282
2283                 if(lua_isnil(L, base)){
2284                         // No metadata
2285                         ref->m_env->getMap().removeNodeMetadata(ref->m_p);
2286                         lua_pushboolean(L, true);
2287                         return 1;
2288                 }
2289
2290                 // Has metadata; clear old one first
2291                 ref->m_env->getMap().removeNodeMetadata(ref->m_p);
2292                 // Create new metadata
2293                 NodeMetadata *meta = getmeta(ref, true);
2294                 // Set fields
2295                 lua_getfield(L, base, "fields");
2296                 int fieldstable = lua_gettop(L);
2297                 lua_pushnil(L);
2298                 while(lua_next(L, fieldstable) != 0){
2299                         // key at index -2 and value at index -1
2300                         std::string name = lua_tostring(L, -2);
2301                         size_t cl;
2302                         const char *cs = lua_tolstring(L, -1, &cl);
2303                         std::string value(cs, cl);
2304                         meta->setString(name, value);
2305                         lua_pop(L, 1); // removes value, keeps key for next iteration
2306                 }
2307                 // Set inventory
2308                 Inventory *inv = meta->getInventory();
2309                 lua_getfield(L, base, "inventory");
2310                 int inventorytable = lua_gettop(L);
2311                 lua_pushnil(L);
2312                 while(lua_next(L, inventorytable) != 0){
2313                         // key at index -2 and value at index -1
2314                         std::string name = lua_tostring(L, -2);
2315                         inventory_set_list_from_lua(inv, name.c_str(), L, -1);
2316                         lua_pop(L, 1); // removes value, keeps key for next iteration
2317                 }
2318                 reportMetadataChange(ref);
2319                 lua_pushboolean(L, true);
2320                 return 1;
2321         }
2322
2323 public:
2324         NodeMetaRef(v3s16 p, ServerEnvironment *env):
2325                 m_p(p),
2326                 m_env(env)
2327         {
2328         }
2329
2330         ~NodeMetaRef()
2331         {
2332         }
2333
2334         // Creates an NodeMetaRef and leaves it on top of stack
2335         // Not callable from Lua; all references are created on the C side.
2336         static void create(lua_State *L, v3s16 p, ServerEnvironment *env)
2337         {
2338                 NodeMetaRef *o = new NodeMetaRef(p, env);
2339                 //infostream<<"NodeMetaRef::create: o="<<o<<std::endl;
2340                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2341                 luaL_getmetatable(L, className);
2342                 lua_setmetatable(L, -2);
2343         }
2344
2345         static void Register(lua_State *L)
2346         {
2347                 lua_newtable(L);
2348                 int methodtable = lua_gettop(L);
2349                 luaL_newmetatable(L, className);
2350                 int metatable = lua_gettop(L);
2351
2352                 lua_pushliteral(L, "__metatable");
2353                 lua_pushvalue(L, methodtable);
2354                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2355
2356                 lua_pushliteral(L, "__index");
2357                 lua_pushvalue(L, methodtable);
2358                 lua_settable(L, metatable);
2359
2360                 lua_pushliteral(L, "__gc");
2361                 lua_pushcfunction(L, gc_object);
2362                 lua_settable(L, metatable);
2363
2364                 lua_pop(L, 1);  // drop metatable
2365
2366                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2367                 lua_pop(L, 1);  // drop methodtable
2368
2369                 // Cannot be created from Lua
2370                 //lua_register(L, className, create_object);
2371         }
2372 };
2373 const char NodeMetaRef::className[] = "NodeMetaRef";
2374 const luaL_reg NodeMetaRef::methods[] = {
2375         method(NodeMetaRef, get_string),
2376         method(NodeMetaRef, set_string),
2377         method(NodeMetaRef, get_int),
2378         method(NodeMetaRef, set_int),
2379         method(NodeMetaRef, get_float),
2380         method(NodeMetaRef, set_float),
2381         method(NodeMetaRef, get_inventory),
2382         method(NodeMetaRef, to_table),
2383         method(NodeMetaRef, from_table),
2384         {0,0}
2385 };
2386
2387 /*
2388         ObjectRef
2389 */
2390
2391 class ObjectRef
2392 {
2393 private:
2394         ServerActiveObject *m_object;
2395
2396         static const char className[];
2397         static const luaL_reg methods[];
2398 public:
2399         static ObjectRef *checkobject(lua_State *L, int narg)
2400         {
2401                 luaL_checktype(L, narg, LUA_TUSERDATA);
2402                 void *ud = luaL_checkudata(L, narg, className);
2403                 if(!ud) luaL_typerror(L, narg, className);
2404                 return *(ObjectRef**)ud;  // unbox pointer
2405         }
2406
2407         static ServerActiveObject* getobject(ObjectRef *ref)
2408         {
2409                 ServerActiveObject *co = ref->m_object;
2410                 return co;
2411         }
2412 private:
2413         static LuaEntitySAO* getluaobject(ObjectRef *ref)
2414         {
2415                 ServerActiveObject *obj = getobject(ref);
2416                 if(obj == NULL)
2417                         return NULL;
2418                 if(obj->getType() != ACTIVEOBJECT_TYPE_LUAENTITY)
2419                         return NULL;
2420                 return (LuaEntitySAO*)obj;
2421         }
2422
2423         static PlayerSAO* getplayersao(ObjectRef *ref)
2424         {
2425                 ServerActiveObject *obj = getobject(ref);
2426                 if(obj == NULL)
2427                         return NULL;
2428                 if(obj->getType() != ACTIVEOBJECT_TYPE_PLAYER)
2429                         return NULL;
2430                 return (PlayerSAO*)obj;
2431         }
2432
2433         static Player* getplayer(ObjectRef *ref)
2434         {
2435                 PlayerSAO *playersao = getplayersao(ref);
2436                 if(playersao == NULL)
2437                         return NULL;
2438                 return playersao->getPlayer();
2439         }
2440
2441         // Exported functions
2442
2443         // garbage collector
2444         static int gc_object(lua_State *L) {
2445                 ObjectRef *o = *(ObjectRef **)(lua_touserdata(L, 1));
2446                 //infostream<<"ObjectRef::gc_object: o="<<o<<std::endl;
2447                 delete o;
2448                 return 0;
2449         }
2450
2451         // remove(self)
2452         static int l_remove(lua_State *L)
2453         {
2454                 ObjectRef *ref = checkobject(L, 1);
2455                 ServerActiveObject *co = getobject(ref);
2456                 if(co == NULL) return 0;
2457                 verbosestream<<"ObjectRef::l_remove(): id="<<co->getId()<<std::endl;
2458                 co->m_removed = true;
2459                 return 0;
2460         }
2461
2462         // getpos(self)
2463         // returns: {x=num, y=num, z=num}
2464         static int l_getpos(lua_State *L)
2465         {
2466                 ObjectRef *ref = checkobject(L, 1);
2467                 ServerActiveObject *co = getobject(ref);
2468                 if(co == NULL) return 0;
2469                 v3f pos = co->getBasePosition() / BS;
2470                 lua_newtable(L);
2471                 lua_pushnumber(L, pos.X);
2472                 lua_setfield(L, -2, "x");
2473                 lua_pushnumber(L, pos.Y);
2474                 lua_setfield(L, -2, "y");
2475                 lua_pushnumber(L, pos.Z);
2476                 lua_setfield(L, -2, "z");
2477                 return 1;
2478         }
2479
2480         // setpos(self, pos)
2481         static int l_setpos(lua_State *L)
2482         {
2483                 ObjectRef *ref = checkobject(L, 1);
2484                 //LuaEntitySAO *co = getluaobject(ref);
2485                 ServerActiveObject *co = getobject(ref);
2486                 if(co == NULL) return 0;
2487                 // pos
2488                 v3f pos = checkFloatPos(L, 2);
2489                 // Do it
2490                 co->setPos(pos);
2491                 return 0;
2492         }
2493
2494         // moveto(self, pos, continuous=false)
2495         static int l_moveto(lua_State *L)
2496         {
2497                 ObjectRef *ref = checkobject(L, 1);
2498                 //LuaEntitySAO *co = getluaobject(ref);
2499                 ServerActiveObject *co = getobject(ref);
2500                 if(co == NULL) return 0;
2501                 // pos
2502                 v3f pos = checkFloatPos(L, 2);
2503                 // continuous
2504                 bool continuous = lua_toboolean(L, 3);
2505                 // Do it
2506                 co->moveTo(pos, continuous);
2507                 return 0;
2508         }
2509
2510         // punch(self, puncher, tool_capabilities, direction, time_from_last_punch)
2511         static int l_punch(lua_State *L)
2512         {
2513                 ObjectRef *ref = checkobject(L, 1);
2514                 ObjectRef *puncher_ref = checkobject(L, 2);
2515                 ServerActiveObject *co = getobject(ref);
2516                 ServerActiveObject *puncher = getobject(puncher_ref);
2517                 if(co == NULL) return 0;
2518                 if(puncher == NULL) return 0;
2519                 ToolCapabilities toolcap = read_tool_capabilities(L, 3);
2520                 v3f dir = read_v3f(L, 4);
2521                 float time_from_last_punch = 1000000;
2522                 if(lua_isnumber(L, 5))
2523                         time_from_last_punch = lua_tonumber(L, 5);
2524                 // Do it
2525                 puncher->punch(dir, &toolcap, puncher, time_from_last_punch);
2526                 return 0;
2527         }
2528
2529         // right_click(self, clicker); clicker = an another ObjectRef
2530         static int l_right_click(lua_State *L)
2531         {
2532                 ObjectRef *ref = checkobject(L, 1);
2533                 ObjectRef *ref2 = checkobject(L, 2);
2534                 ServerActiveObject *co = getobject(ref);
2535                 ServerActiveObject *co2 = getobject(ref2);
2536                 if(co == NULL) return 0;
2537                 if(co2 == NULL) return 0;
2538                 // Do it
2539                 co->rightClick(co2);
2540                 return 0;
2541         }
2542
2543         // set_hp(self, hp)
2544         // hp = number of hitpoints (2 * number of hearts)
2545         // returns: nil
2546         static int l_set_hp(lua_State *L)
2547         {
2548                 ObjectRef *ref = checkobject(L, 1);
2549                 luaL_checknumber(L, 2);
2550                 ServerActiveObject *co = getobject(ref);
2551                 if(co == NULL) return 0;
2552                 int hp = lua_tonumber(L, 2);
2553                 /*infostream<<"ObjectRef::l_set_hp(): id="<<co->getId()
2554                                 <<" hp="<<hp<<std::endl;*/
2555                 // Do it
2556                 co->setHP(hp);
2557                 // Return
2558                 return 0;
2559         }
2560
2561         // get_hp(self)
2562         // returns: number of hitpoints (2 * number of hearts)
2563         // 0 if not applicable to this type of object
2564         static int l_get_hp(lua_State *L)
2565         {
2566                 ObjectRef *ref = checkobject(L, 1);
2567                 ServerActiveObject *co = getobject(ref);
2568                 if(co == NULL){
2569                         // Default hp is 1
2570                         lua_pushnumber(L, 1);
2571                         return 1;
2572                 }
2573                 int hp = co->getHP();
2574                 /*infostream<<"ObjectRef::l_get_hp(): id="<<co->getId()
2575                                 <<" hp="<<hp<<std::endl;*/
2576                 // Return
2577                 lua_pushnumber(L, hp);
2578                 return 1;
2579         }
2580
2581         // get_inventory(self)
2582         static int l_get_inventory(lua_State *L)
2583         {
2584                 ObjectRef *ref = checkobject(L, 1);
2585                 ServerActiveObject *co = getobject(ref);
2586                 if(co == NULL) return 0;
2587                 // Do it
2588                 InventoryLocation loc = co->getInventoryLocation();
2589                 if(get_server(L)->getInventory(loc) != NULL)
2590                         InvRef::create(L, loc);
2591                 else
2592                         lua_pushnil(L); // An object may have no inventory (nil)
2593                 return 1;
2594         }
2595
2596         // get_wield_list(self)
2597         static int l_get_wield_list(lua_State *L)
2598         {
2599                 ObjectRef *ref = checkobject(L, 1);
2600                 ServerActiveObject *co = getobject(ref);
2601                 if(co == NULL) return 0;
2602                 // Do it
2603                 lua_pushstring(L, co->getWieldList().c_str());
2604                 return 1;
2605         }
2606
2607         // get_wield_index(self)
2608         static int l_get_wield_index(lua_State *L)
2609         {
2610                 ObjectRef *ref = checkobject(L, 1);
2611                 ServerActiveObject *co = getobject(ref);
2612                 if(co == NULL) return 0;
2613                 // Do it
2614                 lua_pushinteger(L, co->getWieldIndex() + 1);
2615                 return 1;
2616         }
2617
2618         // get_wielded_item(self)
2619         static int l_get_wielded_item(lua_State *L)
2620         {
2621                 ObjectRef *ref = checkobject(L, 1);
2622                 ServerActiveObject *co = getobject(ref);
2623                 if(co == NULL){
2624                         // Empty ItemStack
2625                         LuaItemStack::create(L, ItemStack());
2626                         return 1;
2627                 }
2628                 // Do it
2629                 LuaItemStack::create(L, co->getWieldedItem());
2630                 return 1;
2631         }
2632
2633         // set_wielded_item(self, itemstack or itemstring or table or nil)
2634         static int l_set_wielded_item(lua_State *L)
2635         {
2636                 ObjectRef *ref = checkobject(L, 1);
2637                 ServerActiveObject *co = getobject(ref);
2638                 if(co == NULL) return 0;
2639                 // Do it
2640                 ItemStack item = read_item(L, 2);
2641                 bool success = co->setWieldedItem(item);
2642                 lua_pushboolean(L, success);
2643                 return 1;
2644         }
2645
2646         // set_armor_groups(self, groups)
2647         static int l_set_armor_groups(lua_State *L)
2648         {
2649                 ObjectRef *ref = checkobject(L, 1);
2650                 ServerActiveObject *co = getobject(ref);
2651                 if(co == NULL) return 0;
2652                 // Do it
2653                 ItemGroupList groups;
2654                 read_groups(L, 2, groups);
2655                 co->setArmorGroups(groups);
2656                 return 0;
2657         }
2658
2659         // set_properties(self, properties)
2660         static int l_set_properties(lua_State *L)
2661         {
2662                 ObjectRef *ref = checkobject(L, 1);
2663                 ServerActiveObject *co = getobject(ref);
2664                 if(co == NULL) return 0;
2665                 ObjectProperties *prop = co->accessObjectProperties();
2666                 if(!prop)
2667                         return 0;
2668                 read_object_properties(L, 2, prop);
2669                 co->notifyObjectPropertiesModified();
2670                 return 0;
2671         }
2672
2673         /* LuaEntitySAO-only */
2674
2675         // setvelocity(self, {x=num, y=num, z=num})
2676         static int l_setvelocity(lua_State *L)
2677         {
2678                 ObjectRef *ref = checkobject(L, 1);
2679                 LuaEntitySAO *co = getluaobject(ref);
2680                 if(co == NULL) return 0;
2681                 v3f pos = checkFloatPos(L, 2);
2682                 // Do it
2683                 co->setVelocity(pos);
2684                 return 0;
2685         }
2686
2687         // getvelocity(self)
2688         static int l_getvelocity(lua_State *L)
2689         {
2690                 ObjectRef *ref = checkobject(L, 1);
2691                 LuaEntitySAO *co = getluaobject(ref);
2692                 if(co == NULL) return 0;
2693                 // Do it
2694                 v3f v = co->getVelocity();
2695                 pushFloatPos(L, v);
2696                 return 1;
2697         }
2698
2699         // setacceleration(self, {x=num, y=num, z=num})
2700         static int l_setacceleration(lua_State *L)
2701         {
2702                 ObjectRef *ref = checkobject(L, 1);
2703                 LuaEntitySAO *co = getluaobject(ref);
2704                 if(co == NULL) return 0;
2705                 // pos
2706                 v3f pos = checkFloatPos(L, 2);
2707                 // Do it
2708                 co->setAcceleration(pos);
2709                 return 0;
2710         }
2711
2712         // getacceleration(self)
2713         static int l_getacceleration(lua_State *L)
2714         {
2715                 ObjectRef *ref = checkobject(L, 1);
2716                 LuaEntitySAO *co = getluaobject(ref);
2717                 if(co == NULL) return 0;
2718                 // Do it
2719                 v3f v = co->getAcceleration();
2720                 pushFloatPos(L, v);
2721                 return 1;
2722         }
2723
2724         // setyaw(self, radians)
2725         static int l_setyaw(lua_State *L)
2726         {
2727                 ObjectRef *ref = checkobject(L, 1);
2728                 LuaEntitySAO *co = getluaobject(ref);
2729                 if(co == NULL) return 0;
2730                 float yaw = luaL_checknumber(L, 2) * core::RADTODEG;
2731                 // Do it
2732                 co->setYaw(yaw);
2733                 return 0;
2734         }
2735
2736         // getyaw(self)
2737         static int l_getyaw(lua_State *L)
2738         {
2739                 ObjectRef *ref = checkobject(L, 1);
2740                 LuaEntitySAO *co = getluaobject(ref);
2741                 if(co == NULL) return 0;
2742                 // Do it
2743                 float yaw = co->getYaw() * core::DEGTORAD;
2744                 lua_pushnumber(L, yaw);
2745                 return 1;
2746         }
2747
2748         // settexturemod(self, mod)
2749         static int l_settexturemod(lua_State *L)
2750         {
2751                 ObjectRef *ref = checkobject(L, 1);
2752                 LuaEntitySAO *co = getluaobject(ref);
2753                 if(co == NULL) return 0;
2754                 // Do it
2755                 std::string mod = luaL_checkstring(L, 2);
2756                 co->setTextureMod(mod);
2757                 return 0;
2758         }
2759
2760         // setsprite(self, p={x=0,y=0}, num_frames=1, framelength=0.2,
2761         //           select_horiz_by_yawpitch=false)
2762         static int l_setsprite(lua_State *L)
2763         {
2764                 ObjectRef *ref = checkobject(L, 1);
2765                 LuaEntitySAO *co = getluaobject(ref);
2766                 if(co == NULL) return 0;
2767                 // Do it
2768                 v2s16 p(0,0);
2769                 if(!lua_isnil(L, 2))
2770                         p = read_v2s16(L, 2);
2771                 int num_frames = 1;
2772                 if(!lua_isnil(L, 3))
2773                         num_frames = lua_tonumber(L, 3);
2774                 float framelength = 0.2;
2775                 if(!lua_isnil(L, 4))
2776                         framelength = lua_tonumber(L, 4);
2777                 bool select_horiz_by_yawpitch = false;
2778                 if(!lua_isnil(L, 5))
2779                         select_horiz_by_yawpitch = lua_toboolean(L, 5);
2780                 co->setSprite(p, num_frames, framelength, select_horiz_by_yawpitch);
2781                 return 0;
2782         }
2783
2784         // DEPRECATED
2785         // get_entity_name(self)
2786         static int l_get_entity_name(lua_State *L)
2787         {
2788                 ObjectRef *ref = checkobject(L, 1);
2789                 LuaEntitySAO *co = getluaobject(ref);
2790                 if(co == NULL) return 0;
2791                 // Do it
2792                 std::string name = co->getName();
2793                 lua_pushstring(L, name.c_str());
2794                 return 1;
2795         }
2796
2797         // get_luaentity(self)
2798         static int l_get_luaentity(lua_State *L)
2799         {
2800                 ObjectRef *ref = checkobject(L, 1);
2801                 LuaEntitySAO *co = getluaobject(ref);
2802                 if(co == NULL) return 0;
2803                 // Do it
2804                 luaentity_get(L, co->getId());
2805                 return 1;
2806         }
2807
2808         /* Player-only */
2809
2810         // is_player(self)
2811         static int l_is_player(lua_State *L)
2812         {
2813                 ObjectRef *ref = checkobject(L, 1);
2814                 Player *player = getplayer(ref);
2815                 lua_pushboolean(L, (player != NULL));
2816                 return 1;
2817         }
2818
2819         // get_player_name(self)
2820         static int l_get_player_name(lua_State *L)
2821         {
2822                 ObjectRef *ref = checkobject(L, 1);
2823                 Player *player = getplayer(ref);
2824                 if(player == NULL){
2825                         lua_pushlstring(L, "", 0);
2826                         return 1;
2827                 }
2828                 // Do it
2829                 lua_pushstring(L, player->getName());
2830                 return 1;
2831         }
2832
2833         // get_look_dir(self)
2834         static int l_get_look_dir(lua_State *L)
2835         {
2836                 ObjectRef *ref = checkobject(L, 1);
2837                 Player *player = getplayer(ref);
2838                 if(player == NULL) return 0;
2839                 // Do it
2840                 float pitch = player->getRadPitch();
2841                 float yaw = player->getRadYaw();
2842                 v3f v(cos(pitch)*cos(yaw), sin(pitch), cos(pitch)*sin(yaw));
2843                 push_v3f(L, v);
2844                 return 1;
2845         }
2846
2847         // get_look_pitch(self)
2848         static int l_get_look_pitch(lua_State *L)
2849         {
2850                 ObjectRef *ref = checkobject(L, 1);
2851                 Player *player = getplayer(ref);
2852                 if(player == NULL) return 0;
2853                 // Do it
2854                 lua_pushnumber(L, player->getRadPitch());
2855                 return 1;
2856         }
2857
2858         // get_look_yaw(self)
2859         static int l_get_look_yaw(lua_State *L)
2860         {
2861                 ObjectRef *ref = checkobject(L, 1);
2862                 Player *player = getplayer(ref);
2863                 if(player == NULL) return 0;
2864                 // Do it
2865                 lua_pushnumber(L, player->getRadYaw());
2866                 return 1;
2867         }
2868
2869         // set_inventory_formspec(self, formspec)
2870         static int l_set_inventory_formspec(lua_State *L)
2871         {
2872                 ObjectRef *ref = checkobject(L, 1);
2873                 Player *player = getplayer(ref);
2874                 if(player == NULL) return 0;
2875                 std::string formspec = luaL_checkstring(L, 2);
2876
2877                 player->inventory_formspec = formspec;
2878                 get_server(L)->reportInventoryFormspecModified(player->getName());
2879                 lua_pushboolean(L, true);
2880                 return 1;
2881         }
2882
2883         // get_inventory_formspec(self) -> formspec
2884         static int l_get_inventory_formspec(lua_State *L)
2885         {
2886                 ObjectRef *ref = checkobject(L, 1);
2887                 Player *player = getplayer(ref);
2888                 if(player == NULL) return 0;
2889
2890                 std::string formspec = player->inventory_formspec;
2891                 lua_pushlstring(L, formspec.c_str(), formspec.size());
2892                 return 1;
2893         }
2894
2895 public:
2896         ObjectRef(ServerActiveObject *object):
2897                 m_object(object)
2898         {
2899                 //infostream<<"ObjectRef created for id="<<m_object->getId()<<std::endl;
2900         }
2901
2902         ~ObjectRef()
2903         {
2904                 /*if(m_object)
2905                         infostream<<"ObjectRef destructing for id="
2906                                         <<m_object->getId()<<std::endl;
2907                 else
2908                         infostream<<"ObjectRef destructing for id=unknown"<<std::endl;*/
2909         }
2910
2911         // Creates an ObjectRef and leaves it on top of stack
2912         // Not callable from Lua; all references are created on the C side.
2913         static void create(lua_State *L, ServerActiveObject *object)
2914         {
2915                 ObjectRef *o = new ObjectRef(object);
2916                 //infostream<<"ObjectRef::create: o="<<o<<std::endl;
2917                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2918                 luaL_getmetatable(L, className);
2919                 lua_setmetatable(L, -2);
2920         }
2921
2922         static void set_null(lua_State *L)
2923         {
2924                 ObjectRef *o = checkobject(L, -1);
2925                 o->m_object = NULL;
2926         }
2927
2928         static void Register(lua_State *L)
2929         {
2930                 lua_newtable(L);
2931                 int methodtable = lua_gettop(L);
2932                 luaL_newmetatable(L, className);
2933                 int metatable = lua_gettop(L);
2934
2935                 lua_pushliteral(L, "__metatable");
2936                 lua_pushvalue(L, methodtable);
2937                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2938
2939                 lua_pushliteral(L, "__index");
2940                 lua_pushvalue(L, methodtable);
2941                 lua_settable(L, metatable);
2942
2943                 lua_pushliteral(L, "__gc");
2944                 lua_pushcfunction(L, gc_object);
2945                 lua_settable(L, metatable);
2946
2947                 lua_pop(L, 1);  // drop metatable
2948
2949                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2950                 lua_pop(L, 1);  // drop methodtable
2951
2952                 // Cannot be created from Lua
2953                 //lua_register(L, className, create_object);
2954         }
2955 };
2956 const char ObjectRef::className[] = "ObjectRef";
2957 const luaL_reg ObjectRef::methods[] = {
2958         // ServerActiveObject
2959         method(ObjectRef, remove),
2960         method(ObjectRef, getpos),
2961         method(ObjectRef, setpos),
2962         method(ObjectRef, moveto),
2963         method(ObjectRef, punch),
2964         method(ObjectRef, right_click),
2965         method(ObjectRef, set_hp),
2966         method(ObjectRef, get_hp),
2967         method(ObjectRef, get_inventory),
2968         method(ObjectRef, get_wield_list),
2969         method(ObjectRef, get_wield_index),
2970         method(ObjectRef, get_wielded_item),
2971         method(ObjectRef, set_wielded_item),
2972         method(ObjectRef, set_armor_groups),
2973         method(ObjectRef, set_properties),
2974         // LuaEntitySAO-only
2975         method(ObjectRef, setvelocity),
2976         method(ObjectRef, getvelocity),
2977         method(ObjectRef, setacceleration),
2978         method(ObjectRef, getacceleration),
2979         method(ObjectRef, setyaw),
2980         method(ObjectRef, getyaw),
2981         method(ObjectRef, settexturemod),
2982         method(ObjectRef, setsprite),
2983         method(ObjectRef, get_entity_name),
2984         method(ObjectRef, get_luaentity),
2985         // Player-only
2986         method(ObjectRef, is_player),
2987         method(ObjectRef, get_player_name),
2988         method(ObjectRef, get_look_dir),
2989         method(ObjectRef, get_look_pitch),
2990         method(ObjectRef, get_look_yaw),
2991         method(ObjectRef, set_inventory_formspec),
2992         method(ObjectRef, get_inventory_formspec),
2993         {0,0}
2994 };
2995
2996 // Creates a new anonymous reference if cobj=NULL or id=0
2997 static void objectref_get_or_create(lua_State *L,
2998                 ServerActiveObject *cobj)
2999 {
3000         if(cobj == NULL || cobj->getId() == 0){
3001                 ObjectRef::create(L, cobj);
3002         } else {
3003                 objectref_get(L, cobj->getId());
3004         }
3005 }
3006
3007
3008 /*
3009   PerlinNoise
3010  */
3011
3012 class LuaPerlinNoise
3013 {
3014 private:
3015         int seed;
3016         int octaves;
3017         double persistence;
3018         double scale;
3019         static const char className[];
3020         static const luaL_reg methods[];
3021
3022         // Exported functions
3023
3024         // garbage collector
3025         static int gc_object(lua_State *L)
3026         {
3027                 LuaPerlinNoise *o = *(LuaPerlinNoise **)(lua_touserdata(L, 1));
3028                 delete o;
3029                 return 0;
3030         }
3031
3032         static int l_get2d(lua_State *L)
3033         {
3034                 LuaPerlinNoise *o = checkobject(L, 1);
3035                 v2f pos2d = read_v2f(L,2);
3036                 lua_Number val = noise2d_perlin(pos2d.X/o->scale, pos2d.Y/o->scale, o->seed, o->octaves, o->persistence);
3037                 lua_pushnumber(L, val);
3038                 return 1;
3039         }
3040         static int l_get3d(lua_State *L)
3041         {
3042                 LuaPerlinNoise *o = checkobject(L, 1);
3043                 v3f pos3d = read_v3f(L,2);
3044                 lua_Number val = noise3d_perlin(pos3d.X/o->scale, pos3d.Y/o->scale, pos3d.Z/o->scale, o->seed, o->octaves, o->persistence);
3045                 lua_pushnumber(L, val);
3046                 return 1;
3047         }
3048
3049 public:
3050         LuaPerlinNoise(int a_seed, int a_octaves, double a_persistence,
3051                         double a_scale):
3052                 seed(a_seed),
3053                 octaves(a_octaves),
3054                 persistence(a_persistence),
3055                 scale(a_scale)
3056         {
3057         }
3058
3059         ~LuaPerlinNoise()
3060         {
3061         }
3062
3063         // LuaPerlinNoise(seed, octaves, persistence, scale)
3064         // Creates an LuaPerlinNoise and leaves it on top of stack
3065         static int create_object(lua_State *L)
3066         {
3067                 int seed = luaL_checkint(L, 1);
3068                 int octaves = luaL_checkint(L, 2);
3069                 double persistence = luaL_checknumber(L, 3);
3070                 double scale = luaL_checknumber(L, 4);
3071                 LuaPerlinNoise *o = new LuaPerlinNoise(seed, octaves, persistence, scale);
3072                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
3073                 luaL_getmetatable(L, className);
3074                 lua_setmetatable(L, -2);
3075                 return 1;
3076         }
3077
3078         static LuaPerlinNoise* checkobject(lua_State *L, int narg)
3079         {
3080                 luaL_checktype(L, narg, LUA_TUSERDATA);
3081                 void *ud = luaL_checkudata(L, narg, className);
3082                 if(!ud) luaL_typerror(L, narg, className);
3083                 return *(LuaPerlinNoise**)ud;  // unbox pointer
3084         }
3085
3086         static void Register(lua_State *L)
3087         {
3088                 lua_newtable(L);
3089                 int methodtable = lua_gettop(L);
3090                 luaL_newmetatable(L, className);
3091                 int metatable = lua_gettop(L);
3092
3093                 lua_pushliteral(L, "__metatable");
3094                 lua_pushvalue(L, methodtable);
3095                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
3096
3097                 lua_pushliteral(L, "__index");
3098                 lua_pushvalue(L, methodtable);
3099                 lua_settable(L, metatable);
3100
3101                 lua_pushliteral(L, "__gc");
3102                 lua_pushcfunction(L, gc_object);
3103                 lua_settable(L, metatable);
3104
3105                 lua_pop(L, 1);  // drop metatable
3106
3107                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3108                 lua_pop(L, 1);  // drop methodtable
3109
3110                 // Can be created from Lua (PerlinNoise(seed, octaves, persistence)
3111                 lua_register(L, className, create_object);
3112         }
3113 };
3114 const char LuaPerlinNoise::className[] = "PerlinNoise";
3115 const luaL_reg LuaPerlinNoise::methods[] = {
3116         method(LuaPerlinNoise, get2d),
3117         method(LuaPerlinNoise, get3d),
3118         {0,0}
3119 };
3120
3121 /*
3122         EnvRef
3123 */
3124
3125 class EnvRef
3126 {
3127 private:
3128         ServerEnvironment *m_env;
3129
3130         static const char className[];
3131         static const luaL_reg methods[];
3132
3133         static int gc_object(lua_State *L) {
3134                 EnvRef *o = *(EnvRef **)(lua_touserdata(L, 1));
3135                 delete o;
3136                 return 0;
3137         }
3138
3139         static EnvRef *checkobject(lua_State *L, int narg)
3140         {
3141                 luaL_checktype(L, narg, LUA_TUSERDATA);
3142                 void *ud = luaL_checkudata(L, narg, className);
3143                 if(!ud) luaL_typerror(L, narg, className);
3144                 return *(EnvRef**)ud;  // unbox pointer
3145         }
3146
3147         // Exported functions
3148
3149         // EnvRef:set_node(pos, node)
3150         // pos = {x=num, y=num, z=num}
3151         static int l_set_node(lua_State *L)
3152         {
3153                 EnvRef *o = checkobject(L, 1);
3154                 ServerEnvironment *env = o->m_env;
3155                 if(env == NULL) return 0;
3156                 INodeDefManager *ndef = env->getGameDef()->ndef();
3157                 // parameters
3158                 v3s16 pos = read_v3s16(L, 2);
3159                 MapNode n = readnode(L, 3, ndef);
3160                 // Do it
3161                 MapNode n_old = env->getMap().getNodeNoEx(pos);
3162                 // Call destructor
3163                 if(ndef->get(n_old).has_on_destruct)
3164                         scriptapi_node_on_destruct(L, pos, n_old);
3165                 // Replace node
3166                 bool succeeded = env->getMap().addNodeWithEvent(pos, n);
3167                 if(succeeded){
3168                         // Call post-destructor
3169                         if(ndef->get(n_old).has_after_destruct)
3170                                 scriptapi_node_after_destruct(L, pos, n_old);
3171                         // Call constructor
3172                         if(ndef->get(n).has_on_construct)
3173                                 scriptapi_node_on_construct(L, pos, n);
3174                 }
3175                 lua_pushboolean(L, succeeded);
3176                 return 1;
3177         }
3178
3179         static int l_add_node(lua_State *L)
3180         {
3181                 return l_set_node(L);
3182         }
3183
3184         // EnvRef:remove_node(pos)
3185         // pos = {x=num, y=num, z=num}
3186         static int l_remove_node(lua_State *L)
3187         {
3188                 EnvRef *o = checkobject(L, 1);
3189                 ServerEnvironment *env = o->m_env;
3190                 if(env == NULL) return 0;
3191                 INodeDefManager *ndef = env->getGameDef()->ndef();
3192                 // parameters
3193                 v3s16 pos = read_v3s16(L, 2);
3194                 // Do it
3195                 MapNode n_old = env->getMap().getNodeNoEx(pos);
3196                 // Call destructor
3197                 if(ndef->get(n_old).has_on_destruct)
3198                         scriptapi_node_on_destruct(L, pos, n_old);
3199                 // Replace with air
3200                 // This is slightly optimized compared to addNodeWithEvent(air)
3201                 bool succeeded = env->getMap().removeNodeWithEvent(pos);
3202                 if(succeeded){
3203                         // Call post-destructor
3204                         if(ndef->get(n_old).has_after_destruct)
3205                                 scriptapi_node_after_destruct(L, pos, n_old);
3206                 }
3207                 lua_pushboolean(L, succeeded);
3208                 // Air doesn't require constructor
3209                 return 1;
3210         }
3211
3212         // EnvRef:get_node(pos)
3213         // pos = {x=num, y=num, z=num}
3214         static int l_get_node(lua_State *L)
3215         {
3216                 EnvRef *o = checkobject(L, 1);
3217                 ServerEnvironment *env = o->m_env;
3218                 if(env == NULL) return 0;
3219                 // pos
3220                 v3s16 pos = read_v3s16(L, 2);
3221                 // Do it
3222                 MapNode n = env->getMap().getNodeNoEx(pos);
3223                 // Return node
3224                 pushnode(L, n, env->getGameDef()->ndef());
3225                 return 1;
3226         }
3227
3228         // EnvRef:get_node_or_nil(pos)
3229         // pos = {x=num, y=num, z=num}
3230         static int l_get_node_or_nil(lua_State *L)
3231         {
3232                 EnvRef *o = checkobject(L, 1);
3233                 ServerEnvironment *env = o->m_env;
3234                 if(env == NULL) return 0;
3235                 // pos
3236                 v3s16 pos = read_v3s16(L, 2);
3237                 // Do it
3238                 try{
3239                         MapNode n = env->getMap().getNode(pos);
3240                         // Return node
3241                         pushnode(L, n, env->getGameDef()->ndef());
3242                         return 1;
3243                 } catch(InvalidPositionException &e)
3244                 {
3245                         lua_pushnil(L);
3246                         return 1;
3247                 }
3248         }
3249
3250         // EnvRef:get_node_light(pos, timeofday)
3251         // pos = {x=num, y=num, z=num}
3252         // timeofday: nil = current time, 0 = night, 0.5 = day
3253         static int l_get_node_light(lua_State *L)
3254         {
3255                 EnvRef *o = checkobject(L, 1);
3256                 ServerEnvironment *env = o->m_env;
3257                 if(env == NULL) return 0;
3258                 // Do it
3259                 v3s16 pos = read_v3s16(L, 2);
3260                 u32 time_of_day = env->getTimeOfDay();
3261                 if(lua_isnumber(L, 3))
3262                         time_of_day = 24000.0 * lua_tonumber(L, 3);
3263                 time_of_day %= 24000;
3264                 u32 dnr = time_to_daynight_ratio(time_of_day);
3265                 MapNode n = env->getMap().getNodeNoEx(pos);
3266                 try{
3267                         MapNode n = env->getMap().getNode(pos);
3268                         INodeDefManager *ndef = env->getGameDef()->ndef();
3269                         lua_pushinteger(L, n.getLightBlend(dnr, ndef));
3270                         return 1;
3271                 } catch(InvalidPositionException &e)
3272                 {
3273                         lua_pushnil(L);
3274                         return 1;
3275                 }
3276         }
3277
3278         // EnvRef:place_node(pos, node)
3279         // pos = {x=num, y=num, z=num}
3280         static int l_place_node(lua_State *L)
3281         {
3282                 EnvRef *o = checkobject(L, 1);
3283                 ServerEnvironment *env = o->m_env;
3284                 if(env == NULL) return 0;
3285                 v3s16 pos = read_v3s16(L, 2);
3286                 MapNode n = readnode(L, 3, env->getGameDef()->ndef());
3287
3288                 // Don't attempt to load non-loaded area as of now
3289                 MapNode n_old = env->getMap().getNodeNoEx(pos);
3290                 if(n_old.getContent() == CONTENT_IGNORE){
3291                         lua_pushboolean(L, false);
3292                         return 1;
3293                 }
3294                 // Create item to place
3295                 INodeDefManager *ndef = get_server(L)->ndef();
3296                 IItemDefManager *idef = get_server(L)->idef();
3297                 ItemStack item(ndef->get(n).name, 1, 0, "", idef);
3298                 // Make pointed position
3299                 PointedThing pointed;
3300                 pointed.type = POINTEDTHING_NODE;
3301                 pointed.node_abovesurface = pos;
3302                 pointed.node_undersurface = pos + v3s16(0,-1,0);
3303                 // Place it with a NULL placer (appears in Lua as a non-functional
3304                 // ObjectRef)
3305                 bool success = scriptapi_item_on_place(L, item, NULL, pointed);
3306                 lua_pushboolean(L, success);
3307                 return 1;
3308         }
3309
3310         // EnvRef:dig_node(pos)
3311         // pos = {x=num, y=num, z=num}
3312         static int l_dig_node(lua_State *L)
3313         {
3314                 EnvRef *o = checkobject(L, 1);
3315                 ServerEnvironment *env = o->m_env;
3316                 if(env == NULL) return 0;
3317                 v3s16 pos = read_v3s16(L, 2);
3318
3319                 // Don't attempt to load non-loaded area as of now
3320                 MapNode n = env->getMap().getNodeNoEx(pos);
3321                 if(n.getContent() == CONTENT_IGNORE){
3322                         lua_pushboolean(L, false);
3323                         return 1;
3324                 }
3325                 // Dig it out with a NULL digger (appears in Lua as a
3326                 // non-functional ObjectRef)
3327                 bool success = scriptapi_node_on_dig(L, pos, n, NULL);
3328                 lua_pushboolean(L, success);
3329                 return 1;
3330         }
3331
3332         // EnvRef:punch_node(pos)
3333         // pos = {x=num, y=num, z=num}
3334         static int l_punch_node(lua_State *L)
3335         {
3336                 EnvRef *o = checkobject(L, 1);
3337                 ServerEnvironment *env = o->m_env;
3338                 if(env == NULL) return 0;
3339                 v3s16 pos = read_v3s16(L, 2);
3340
3341                 // Don't attempt to load non-loaded area as of now
3342                 MapNode n = env->getMap().getNodeNoEx(pos);
3343                 if(n.getContent() == CONTENT_IGNORE){
3344                         lua_pushboolean(L, false);
3345                         return 1;
3346                 }
3347                 // Punch it with a NULL puncher (appears in Lua as a non-functional
3348                 // ObjectRef)
3349                 bool success = scriptapi_node_on_punch(L, pos, n, NULL);
3350                 lua_pushboolean(L, success);
3351                 return 1;
3352         }
3353
3354         // EnvRef:add_entity(pos, entityname) -> ObjectRef or nil
3355         // pos = {x=num, y=num, z=num}
3356         static int l_add_entity(lua_State *L)
3357         {
3358                 //infostream<<"EnvRef::l_add_entity()"<<std::endl;
3359                 EnvRef *o = checkobject(L, 1);
3360                 ServerEnvironment *env = o->m_env;
3361                 if(env == NULL) return 0;
3362                 // pos
3363                 v3f pos = checkFloatPos(L, 2);
3364                 // content
3365                 const char *name = luaL_checkstring(L, 3);
3366                 // Do it
3367                 ServerActiveObject *obj = new LuaEntitySAO(env, pos, name, "");
3368                 int objectid = env->addActiveObject(obj);
3369                 // If failed to add, return nothing (reads as nil)
3370                 if(objectid == 0)
3371                         return 0;
3372                 // Return ObjectRef
3373                 objectref_get_or_create(L, obj);
3374                 return 1;
3375         }
3376
3377         // EnvRef:add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
3378         // pos = {x=num, y=num, z=num}
3379         static int l_add_item(lua_State *L)
3380         {
3381                 //infostream<<"EnvRef::l_add_item()"<<std::endl;
3382                 EnvRef *o = checkobject(L, 1);
3383                 ServerEnvironment *env = o->m_env;
3384                 if(env == NULL) return 0;
3385                 // pos
3386                 v3f pos = checkFloatPos(L, 2);
3387                 // item
3388                 ItemStack item = read_item(L, 3);
3389                 if(item.empty() || !item.isKnown(get_server(L)->idef()))
3390                         return 0;
3391                 // Use minetest.spawn_item to spawn a __builtin:item
3392                 lua_getglobal(L, "minetest");
3393                 lua_getfield(L, -1, "spawn_item");
3394                 if(lua_isnil(L, -1))
3395                         return 0;
3396                 lua_pushvalue(L, 2);
3397                 lua_pushstring(L, item.getItemString().c_str());
3398                 if(lua_pcall(L, 2, 1, 0))
3399                         script_error(L, "error: %s", lua_tostring(L, -1));
3400                 return 1;
3401                 /*lua_pushvalue(L, 1);
3402                 lua_pushstring(L, "__builtin:item");
3403                 lua_pushstring(L, item.getItemString().c_str());
3404                 return l_add_entity(L);*/
3405                 /*// Do it
3406                 ServerActiveObject *obj = createItemSAO(env, pos, item.getItemString());
3407                 int objectid = env->addActiveObject(obj);
3408                 // If failed to add, return nothing (reads as nil)
3409                 if(objectid == 0)
3410                         return 0;
3411                 // Return ObjectRef
3412                 objectref_get_or_create(L, obj);
3413                 return 1;*/
3414         }
3415
3416         // EnvRef:add_rat(pos)
3417         // pos = {x=num, y=num, z=num}
3418         static int l_add_rat(lua_State *L)
3419         {
3420                 infostream<<"EnvRef::l_add_rat(): C++ mobs have been removed."
3421                                 <<" Doing nothing."<<std::endl;
3422                 return 0;
3423         }
3424
3425         // EnvRef:add_firefly(pos)
3426         // pos = {x=num, y=num, z=num}
3427         static int l_add_firefly(lua_State *L)
3428         {
3429                 infostream<<"EnvRef::l_add_firefly(): C++ mobs have been removed."
3430                                 <<" Doing nothing."<<std::endl;
3431                 return 0;
3432         }
3433
3434         // EnvRef:get_meta(pos)
3435         static int l_get_meta(lua_State *L)
3436         {
3437                 //infostream<<"EnvRef::l_get_meta()"<<std::endl;
3438                 EnvRef *o = checkobject(L, 1);
3439                 ServerEnvironment *env = o->m_env;
3440                 if(env == NULL) return 0;
3441                 // Do it
3442                 v3s16 p = read_v3s16(L, 2);
3443                 NodeMetaRef::create(L, p, env);
3444                 return 1;
3445         }
3446
3447         // EnvRef:get_player_by_name(name)
3448         static int l_get_player_by_name(lua_State *L)
3449         {
3450                 EnvRef *o = checkobject(L, 1);
3451                 ServerEnvironment *env = o->m_env;
3452                 if(env == NULL) return 0;
3453                 // Do it
3454                 const char *name = luaL_checkstring(L, 2);
3455                 Player *player = env->getPlayer(name);
3456                 if(player == NULL){
3457                         lua_pushnil(L);
3458                         return 1;
3459                 }
3460                 PlayerSAO *sao = player->getPlayerSAO();
3461                 if(sao == NULL){
3462                         lua_pushnil(L);
3463                         return 1;
3464                 }
3465                 // Put player on stack
3466                 objectref_get_or_create(L, sao);
3467                 return 1;
3468         }
3469
3470         // EnvRef:get_objects_inside_radius(pos, radius)
3471         static int l_get_objects_inside_radius(lua_State *L)
3472         {
3473                 // Get the table insert function
3474                 lua_getglobal(L, "table");
3475                 lua_getfield(L, -1, "insert");
3476                 int table_insert = lua_gettop(L);
3477                 // Get environemnt
3478                 EnvRef *o = checkobject(L, 1);
3479                 ServerEnvironment *env = o->m_env;
3480                 if(env == NULL) return 0;
3481                 // Do it
3482                 v3f pos = checkFloatPos(L, 2);
3483                 float radius = luaL_checknumber(L, 3) * BS;
3484                 std::set<u16> ids = env->getObjectsInsideRadius(pos, radius);
3485                 lua_newtable(L);
3486                 int table = lua_gettop(L);
3487                 for(std::set<u16>::const_iterator
3488                                 i = ids.begin(); i != ids.end(); i++){
3489                         ServerActiveObject *obj = env->getActiveObject(*i);
3490                         // Insert object reference into table
3491                         lua_pushvalue(L, table_insert);
3492                         lua_pushvalue(L, table);
3493                         objectref_get_or_create(L, obj);
3494                         if(lua_pcall(L, 2, 0, 0))
3495                                 script_error(L, "error: %s", lua_tostring(L, -1));
3496                 }
3497                 return 1;
3498         }
3499
3500         // EnvRef:set_timeofday(val)
3501         // val = 0...1
3502         static int l_set_timeofday(lua_State *L)
3503         {
3504                 EnvRef *o = checkobject(L, 1);
3505                 ServerEnvironment *env = o->m_env;
3506                 if(env == NULL) return 0;
3507                 // Do it
3508                 float timeofday_f = luaL_checknumber(L, 2);
3509                 assert(timeofday_f >= 0.0 && timeofday_f <= 1.0);
3510                 int timeofday_mh = (int)(timeofday_f * 24000.0);
3511                 // This should be set directly in the environment but currently
3512                 // such changes aren't immediately sent to the clients, so call
3513                 // the server instead.
3514                 //env->setTimeOfDay(timeofday_mh);
3515                 get_server(L)->setTimeOfDay(timeofday_mh);
3516                 return 0;
3517         }
3518
3519         // EnvRef:get_timeofday() -> 0...1
3520         static int l_get_timeofday(lua_State *L)
3521         {
3522                 EnvRef *o = checkobject(L, 1);
3523                 ServerEnvironment *env = o->m_env;
3524                 if(env == NULL) return 0;
3525                 // Do it
3526                 int timeofday_mh = env->getTimeOfDay();
3527                 float timeofday_f = (float)timeofday_mh / 24000.0;
3528                 lua_pushnumber(L, timeofday_f);
3529                 return 1;
3530         }
3531
3532
3533         // EnvRef:find_node_near(pos, radius, nodenames) -> pos or nil
3534         // nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
3535         static int l_find_node_near(lua_State *L)
3536         {
3537                 EnvRef *o = checkobject(L, 1);
3538                 ServerEnvironment *env = o->m_env;
3539                 if(env == NULL) return 0;
3540                 INodeDefManager *ndef = get_server(L)->ndef();
3541                 v3s16 pos = read_v3s16(L, 2);
3542                 int radius = luaL_checkinteger(L, 3);
3543                 std::set<content_t> filter;
3544                 if(lua_istable(L, 4)){
3545                         int table = 4;
3546                         lua_pushnil(L);
3547                         while(lua_next(L, table) != 0){
3548                                 // key at index -2 and value at index -1
3549                                 luaL_checktype(L, -1, LUA_TSTRING);
3550                                 ndef->getIds(lua_tostring(L, -1), filter);
3551                                 // removes value, keeps key for next iteration
3552                                 lua_pop(L, 1);
3553                         }
3554                 } else if(lua_isstring(L, 4)){
3555                         ndef->getIds(lua_tostring(L, 4), filter);
3556                 }
3557
3558                 for(int d=1; d<=radius; d++){
3559                         core::list<v3s16> list;
3560                         getFacePositions(list, d);
3561                         for(core::list<v3s16>::Iterator i = list.begin();
3562                                         i != list.end(); i++){
3563                                 v3s16 p = pos + (*i);
3564                                 content_t c = env->getMap().getNodeNoEx(p).getContent();
3565                                 if(filter.count(c) != 0){
3566                                         push_v3s16(L, p);
3567                                         return 1;
3568                                 }
3569                         }
3570                 }
3571                 return 0;
3572         }
3573
3574         // EnvRef:find_nodes_in_area(minp, maxp, nodenames) -> list of positions
3575         // nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
3576         static int l_find_nodes_in_area(lua_State *L)
3577         {
3578                 EnvRef *o = checkobject(L, 1);
3579                 ServerEnvironment *env = o->m_env;
3580                 if(env == NULL) return 0;
3581                 INodeDefManager *ndef = get_server(L)->ndef();
3582                 v3s16 minp = read_v3s16(L, 2);
3583                 v3s16 maxp = read_v3s16(L, 3);
3584                 std::set<content_t> filter;
3585                 if(lua_istable(L, 4)){
3586                         int table = 4;
3587                         lua_pushnil(L);
3588                         while(lua_next(L, table) != 0){
3589                                 // key at index -2 and value at index -1
3590                                 luaL_checktype(L, -1, LUA_TSTRING);
3591                                 ndef->getIds(lua_tostring(L, -1), filter);
3592                                 // removes value, keeps key for next iteration
3593                                 lua_pop(L, 1);
3594                         }
3595                 } else if(lua_isstring(L, 4)){
3596                         ndef->getIds(lua_tostring(L, 4), filter);
3597                 }
3598
3599                 // Get the table insert function
3600                 lua_getglobal(L, "table");
3601                 lua_getfield(L, -1, "insert");
3602                 int table_insert = lua_gettop(L);
3603
3604                 lua_newtable(L);
3605                 int table = lua_gettop(L);
3606                 for(s16 x=minp.X; x<=maxp.X; x++)
3607                 for(s16 y=minp.Y; y<=maxp.Y; y++)
3608                 for(s16 z=minp.Z; z<=maxp.Z; z++)
3609                 {
3610                         v3s16 p(x,y,z);
3611                         content_t c = env->getMap().getNodeNoEx(p).getContent();
3612                         if(filter.count(c) != 0){
3613                                 lua_pushvalue(L, table_insert);
3614                                 lua_pushvalue(L, table);
3615                                 push_v3s16(L, p);
3616                                 if(lua_pcall(L, 2, 0, 0))
3617                                         script_error(L, "error: %s", lua_tostring(L, -1));
3618                         }
3619                 }
3620                 return 1;
3621         }
3622
3623         //      EnvRef:get_perlin(seeddiff, octaves, persistence, scale)
3624         //  returns world-specific PerlinNoise
3625         static int l_get_perlin(lua_State *L)
3626         {
3627                 EnvRef *o = checkobject(L, 1);
3628                 ServerEnvironment *env = o->m_env;
3629                 if(env == NULL) return 0;
3630
3631                 int seeddiff = luaL_checkint(L, 2);
3632                 int octaves = luaL_checkint(L, 3);
3633                 double persistence = luaL_checknumber(L, 4);
3634                 double scale = luaL_checknumber(L, 5);
3635
3636                 LuaPerlinNoise *n = new LuaPerlinNoise(seeddiff + int(env->getServerMap().getSeed()), octaves, persistence, scale);
3637                 *(void **)(lua_newuserdata(L, sizeof(void *))) = n;
3638                 luaL_getmetatable(L, "PerlinNoise");
3639                 lua_setmetatable(L, -2);
3640                 return 1;
3641         }
3642
3643 public:
3644         EnvRef(ServerEnvironment *env):
3645                 m_env(env)
3646         {
3647                 //infostream<<"EnvRef created"<<std::endl;
3648         }
3649
3650         ~EnvRef()
3651         {
3652                 //infostream<<"EnvRef destructing"<<std::endl;
3653         }
3654
3655         // Creates an EnvRef and leaves it on top of stack
3656         // Not callable from Lua; all references are created on the C side.
3657         static void create(lua_State *L, ServerEnvironment *env)
3658         {
3659                 EnvRef *o = new EnvRef(env);
3660                 //infostream<<"EnvRef::create: o="<<o<<std::endl;
3661                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
3662                 luaL_getmetatable(L, className);
3663                 lua_setmetatable(L, -2);
3664         }
3665
3666         static void set_null(lua_State *L)
3667         {
3668                 EnvRef *o = checkobject(L, -1);
3669                 o->m_env = NULL;
3670         }
3671
3672         static void Register(lua_State *L)
3673         {
3674                 lua_newtable(L);
3675                 int methodtable = lua_gettop(L);
3676                 luaL_newmetatable(L, className);
3677                 int metatable = lua_gettop(L);
3678
3679                 lua_pushliteral(L, "__metatable");
3680                 lua_pushvalue(L, methodtable);
3681                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
3682
3683                 lua_pushliteral(L, "__index");
3684                 lua_pushvalue(L, methodtable);
3685                 lua_settable(L, metatable);
3686
3687                 lua_pushliteral(L, "__gc");
3688                 lua_pushcfunction(L, gc_object);
3689                 lua_settable(L, metatable);
3690
3691                 lua_pop(L, 1);  // drop metatable
3692
3693                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3694                 lua_pop(L, 1);  // drop methodtable
3695
3696                 // Cannot be created from Lua
3697                 //lua_register(L, className, create_object);
3698         }
3699 };
3700 const char EnvRef::className[] = "EnvRef";
3701 const luaL_reg EnvRef::methods[] = {
3702         method(EnvRef, set_node),
3703         method(EnvRef, add_node),
3704         method(EnvRef, remove_node),
3705         method(EnvRef, get_node),
3706         method(EnvRef, get_node_or_nil),
3707         method(EnvRef, get_node_light),
3708         method(EnvRef, place_node),
3709         method(EnvRef, dig_node),
3710         method(EnvRef, punch_node),
3711         method(EnvRef, add_entity),
3712         method(EnvRef, add_item),
3713         method(EnvRef, add_rat),
3714         method(EnvRef, add_firefly),
3715         method(EnvRef, get_meta),
3716         method(EnvRef, get_player_by_name),
3717         method(EnvRef, get_objects_inside_radius),
3718         method(EnvRef, set_timeofday),
3719         method(EnvRef, get_timeofday),
3720         method(EnvRef, find_node_near),
3721         method(EnvRef, find_nodes_in_area),
3722         method(EnvRef, get_perlin),
3723         {0,0}
3724 };
3725
3726 /*
3727         LuaPseudoRandom
3728 */
3729
3730
3731 class LuaPseudoRandom
3732 {
3733 private:
3734         PseudoRandom m_pseudo;
3735
3736         static const char className[];
3737         static const luaL_reg methods[];
3738
3739         // Exported functions
3740
3741         // garbage collector
3742         static int gc_object(lua_State *L)
3743         {
3744                 LuaPseudoRandom *o = *(LuaPseudoRandom **)(lua_touserdata(L, 1));
3745                 delete o;
3746                 return 0;
3747         }
3748
3749         // next(self, min=0, max=32767) -> get next value
3750         static int l_next(lua_State *L)
3751         {
3752                 LuaPseudoRandom *o = checkobject(L, 1);
3753                 int min = 0;
3754                 int max = 32767;
3755                 lua_settop(L, 3); // Fill 2 and 3 with nil if they don't exist
3756                 if(!lua_isnil(L, 2))
3757                         min = luaL_checkinteger(L, 2);
3758                 if(!lua_isnil(L, 3))
3759                         max = luaL_checkinteger(L, 3);
3760                 if(max - min != 32767 && max - min > 32767/5)
3761                         throw LuaError(L, "PseudoRandom.next() max-min is not 32767 and is > 32768/5. This is disallowed due to the bad random distribution the implementation would otherwise make.");
3762                 PseudoRandom &pseudo = o->m_pseudo;
3763                 int val = pseudo.next();
3764                 val = (val % (max-min+1)) + min;
3765                 lua_pushinteger(L, val);
3766                 return 1;
3767         }
3768
3769 public:
3770         LuaPseudoRandom(int seed):
3771                 m_pseudo(seed)
3772         {
3773         }
3774
3775         ~LuaPseudoRandom()
3776         {
3777         }
3778
3779         const PseudoRandom& getItem() const
3780         {
3781                 return m_pseudo;
3782         }
3783         PseudoRandom& getItem()
3784         {
3785                 return m_pseudo;
3786         }
3787
3788         // LuaPseudoRandom(seed)
3789         // Creates an LuaPseudoRandom and leaves it on top of stack
3790         static int create_object(lua_State *L)
3791         {
3792                 int seed = luaL_checknumber(L, 1);
3793                 LuaPseudoRandom *o = new LuaPseudoRandom(seed);
3794                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
3795                 luaL_getmetatable(L, className);
3796                 lua_setmetatable(L, -2);
3797                 return 1;
3798         }
3799
3800         static LuaPseudoRandom* checkobject(lua_State *L, int narg)
3801         {
3802                 luaL_checktype(L, narg, LUA_TUSERDATA);
3803                 void *ud = luaL_checkudata(L, narg, className);
3804                 if(!ud) luaL_typerror(L, narg, className);
3805                 return *(LuaPseudoRandom**)ud;  // unbox pointer
3806         }
3807
3808         static void Register(lua_State *L)
3809         {
3810                 lua_newtable(L);
3811                 int methodtable = lua_gettop(L);
3812                 luaL_newmetatable(L, className);
3813                 int metatable = lua_gettop(L);
3814
3815                 lua_pushliteral(L, "__metatable");
3816                 lua_pushvalue(L, methodtable);
3817                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
3818
3819                 lua_pushliteral(L, "__index");
3820                 lua_pushvalue(L, methodtable);
3821                 lua_settable(L, metatable);
3822
3823                 lua_pushliteral(L, "__gc");
3824                 lua_pushcfunction(L, gc_object);
3825                 lua_settable(L, metatable);
3826
3827                 lua_pop(L, 1);  // drop metatable
3828
3829                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3830                 lua_pop(L, 1);  // drop methodtable
3831
3832                 // Can be created from Lua (LuaPseudoRandom(seed))
3833                 lua_register(L, className, create_object);
3834         }
3835 };
3836 const char LuaPseudoRandom::className[] = "PseudoRandom";
3837 const luaL_reg LuaPseudoRandom::methods[] = {
3838         method(LuaPseudoRandom, next),
3839         {0,0}
3840 };
3841
3842
3843
3844 /*
3845         LuaABM
3846 */
3847
3848 class LuaABM : public ActiveBlockModifier
3849 {
3850 private:
3851         lua_State *m_lua;
3852         int m_id;
3853
3854         std::set<std::string> m_trigger_contents;
3855         std::set<std::string> m_required_neighbors;
3856         float m_trigger_interval;
3857         u32 m_trigger_chance;
3858 public:
3859         LuaABM(lua_State *L, int id,
3860                         const std::set<std::string> &trigger_contents,
3861                         const std::set<std::string> &required_neighbors,
3862                         float trigger_interval, u32 trigger_chance):
3863                 m_lua(L),
3864                 m_id(id),
3865                 m_trigger_contents(trigger_contents),
3866                 m_required_neighbors(required_neighbors),
3867                 m_trigger_interval(trigger_interval),
3868                 m_trigger_chance(trigger_chance)
3869         {
3870         }
3871         virtual std::set<std::string> getTriggerContents()
3872         {
3873                 return m_trigger_contents;
3874         }
3875         virtual std::set<std::string> getRequiredNeighbors()
3876         {
3877                 return m_required_neighbors;
3878         }
3879         virtual float getTriggerInterval()
3880         {
3881                 return m_trigger_interval;
3882         }
3883         virtual u32 getTriggerChance()
3884         {
3885                 return m_trigger_chance;
3886         }
3887         virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n,
3888                         u32 active_object_count, u32 active_object_count_wider)
3889         {
3890                 lua_State *L = m_lua;
3891
3892                 realitycheck(L);
3893                 assert(lua_checkstack(L, 20));
3894                 StackUnroller stack_unroller(L);
3895
3896                 // Get minetest.registered_abms
3897                 lua_getglobal(L, "minetest");
3898                 lua_getfield(L, -1, "registered_abms");
3899                 luaL_checktype(L, -1, LUA_TTABLE);
3900                 int registered_abms = lua_gettop(L);
3901
3902                 // Get minetest.registered_abms[m_id]
3903                 lua_pushnumber(L, m_id);
3904                 lua_gettable(L, registered_abms);
3905                 if(lua_isnil(L, -1))
3906                         assert(0);
3907
3908                 // Call action
3909                 luaL_checktype(L, -1, LUA_TTABLE);
3910                 lua_getfield(L, -1, "action");
3911                 luaL_checktype(L, -1, LUA_TFUNCTION);
3912                 push_v3s16(L, p);
3913                 pushnode(L, n, env->getGameDef()->ndef());
3914                 lua_pushnumber(L, active_object_count);
3915                 lua_pushnumber(L, active_object_count_wider);
3916                 if(lua_pcall(L, 4, 0, 0))
3917                         script_error(L, "error: %s", lua_tostring(L, -1));
3918         }
3919 };
3920
3921 /*
3922         ServerSoundParams
3923 */
3924
3925 static void read_server_sound_params(lua_State *L, int index,
3926                 ServerSoundParams &params)
3927 {
3928         if(index < 0)
3929                 index = lua_gettop(L) + 1 + index;
3930         // Clear
3931         params = ServerSoundParams();
3932         if(lua_istable(L, index)){
3933                 getfloatfield(L, index, "gain", params.gain);
3934                 getstringfield(L, index, "to_player", params.to_player);
3935                 lua_getfield(L, index, "pos");
3936                 if(!lua_isnil(L, -1)){
3937                         v3f p = read_v3f(L, -1)*BS;
3938                         params.pos = p;
3939                         params.type = ServerSoundParams::SSP_POSITIONAL;
3940                 }
3941                 lua_pop(L, 1);
3942                 lua_getfield(L, index, "object");
3943                 if(!lua_isnil(L, -1)){
3944                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
3945                         ServerActiveObject *sao = ObjectRef::getobject(ref);
3946                         if(sao){
3947                                 params.object = sao->getId();
3948                                 params.type = ServerSoundParams::SSP_OBJECT;
3949                         }
3950                 }
3951                 lua_pop(L, 1);
3952                 params.max_hear_distance = BS*getfloatfield_default(L, index,
3953                                 "max_hear_distance", params.max_hear_distance/BS);
3954                 getboolfield(L, index, "loop", params.loop);
3955         }
3956 }
3957
3958 /*
3959         Global functions
3960 */
3961
3962 // debug(text)
3963 // Writes a line to dstream
3964 static int l_debug(lua_State *L)
3965 {
3966         std::string text = lua_tostring(L, 1);
3967         dstream << text << std::endl;
3968         return 0;
3969 }
3970
3971 // log([level,] text)
3972 // Writes a line to the logger.
3973 // The one-argument version logs to infostream.
3974 // The two-argument version accept a log level: error, action, info, or verbose.
3975 static int l_log(lua_State *L)
3976 {
3977         std::string text;
3978         LogMessageLevel level = LMT_INFO;
3979         if(lua_isnone(L, 2))
3980         {
3981                 text = lua_tostring(L, 1);
3982         }
3983         else
3984         {
3985                 std::string levelname = lua_tostring(L, 1);
3986                 text = lua_tostring(L, 2);
3987                 if(levelname == "error")
3988                         level = LMT_ERROR;
3989                 else if(levelname == "action")
3990                         level = LMT_ACTION;
3991                 else if(levelname == "verbose")
3992                         level = LMT_VERBOSE;
3993         }
3994         log_printline(level, text);
3995         return 0;
3996 }
3997
3998 // register_item_raw({lots of stuff})
3999 static int l_register_item_raw(lua_State *L)
4000 {
4001         luaL_checktype(L, 1, LUA_TTABLE);
4002         int table = 1;
4003
4004         // Get the writable item and node definition managers from the server
4005         IWritableItemDefManager *idef =
4006                         get_server(L)->getWritableItemDefManager();
4007         IWritableNodeDefManager *ndef =
4008                         get_server(L)->getWritableNodeDefManager();
4009
4010         // Check if name is defined
4011         std::string name;
4012         lua_getfield(L, table, "name");
4013         if(lua_isstring(L, -1)){
4014                 name = lua_tostring(L, -1);
4015                 verbosestream<<"register_item_raw: "<<name<<std::endl;
4016         } else {
4017                 throw LuaError(L, "register_item_raw: name is not defined or not a string");
4018         }
4019
4020         // Check if on_use is defined
4021
4022         ItemDefinition def;
4023         // Set a distinctive default value to check if this is set
4024         def.node_placement_prediction = "__default";
4025
4026         // Read the item definition
4027         def = read_item_definition(L, table, def);
4028
4029         // Default to having client-side placement prediction for nodes
4030         // ("" in item definition sets it off)
4031         if(def.node_placement_prediction == "__default"){
4032                 if(def.type == ITEM_NODE)
4033                         def.node_placement_prediction = name;
4034                 else
4035                         def.node_placement_prediction = "";
4036         }
4037
4038         // Register item definition
4039         idef->registerItem(def);
4040
4041         // Read the node definition (content features) and register it
4042         if(def.type == ITEM_NODE)
4043         {
4044                 ContentFeatures f = read_content_features(L, table);
4045                 ndef->set(f.name, f);
4046         }
4047
4048         return 0; /* number of results */
4049 }
4050
4051 // register_alias_raw(name, convert_to_name)
4052 static int l_register_alias_raw(lua_State *L)
4053 {
4054         std::string name = luaL_checkstring(L, 1);
4055         std::string convert_to = luaL_checkstring(L, 2);
4056
4057         // Get the writable item definition manager from the server
4058         IWritableItemDefManager *idef =
4059                         get_server(L)->getWritableItemDefManager();
4060
4061         idef->registerAlias(name, convert_to);
4062
4063         return 0; /* number of results */
4064 }
4065
4066 // helper for register_craft
4067 static bool read_craft_recipe_shaped(lua_State *L, int index,
4068                 int &width, std::vector<std::string> &recipe)
4069 {
4070         if(index < 0)
4071                 index = lua_gettop(L) + 1 + index;
4072
4073         if(!lua_istable(L, index))
4074                 return false;
4075
4076         lua_pushnil(L);
4077         int rowcount = 0;
4078         while(lua_next(L, index) != 0){
4079                 int colcount = 0;
4080                 // key at index -2 and value at index -1
4081                 if(!lua_istable(L, -1))
4082                         return false;
4083                 int table2 = lua_gettop(L);
4084                 lua_pushnil(L);
4085                 while(lua_next(L, table2) != 0){
4086                         // key at index -2 and value at index -1
4087                         if(!lua_isstring(L, -1))
4088                                 return false;
4089                         recipe.push_back(lua_tostring(L, -1));
4090                         // removes value, keeps key for next iteration
4091                         lua_pop(L, 1);
4092                         colcount++;
4093                 }
4094                 if(rowcount == 0){
4095                         width = colcount;
4096                 } else {
4097                         if(colcount != width)
4098                                 return false;
4099                 }
4100                 // removes value, keeps key for next iteration
4101                 lua_pop(L, 1);
4102                 rowcount++;
4103         }
4104         return width != 0;
4105 }
4106
4107 // helper for register_craft
4108 static bool read_craft_recipe_shapeless(lua_State *L, int index,
4109                 std::vector<std::string> &recipe)
4110 {
4111         if(index < 0)
4112                 index = lua_gettop(L) + 1 + index;
4113
4114         if(!lua_istable(L, index))
4115                 return false;
4116
4117         lua_pushnil(L);
4118         while(lua_next(L, index) != 0){
4119                 // key at index -2 and value at index -1
4120                 if(!lua_isstring(L, -1))
4121                         return false;
4122                 recipe.push_back(lua_tostring(L, -1));
4123                 // removes value, keeps key for next iteration
4124                 lua_pop(L, 1);
4125         }
4126         return true;
4127 }
4128
4129 // helper for register_craft
4130 static bool read_craft_replacements(lua_State *L, int index,
4131                 CraftReplacements &replacements)
4132 {
4133         if(index < 0)
4134                 index = lua_gettop(L) + 1 + index;
4135
4136         if(!lua_istable(L, index))
4137                 return false;
4138
4139         lua_pushnil(L);
4140         while(lua_next(L, index) != 0){
4141                 // key at index -2 and value at index -1
4142                 if(!lua_istable(L, -1))
4143                         return false;
4144                 lua_rawgeti(L, -1, 1);
4145                 if(!lua_isstring(L, -1))
4146                         return false;
4147                 std::string replace_from = lua_tostring(L, -1);
4148                 lua_pop(L, 1);
4149                 lua_rawgeti(L, -1, 2);
4150                 if(!lua_isstring(L, -1))
4151                         return false;
4152                 std::string replace_to = lua_tostring(L, -1);
4153                 lua_pop(L, 1);
4154                 replacements.pairs.push_back(
4155                                 std::make_pair(replace_from, replace_to));
4156                 // removes value, keeps key for next iteration
4157                 lua_pop(L, 1);
4158         }
4159         return true;
4160 }
4161 // register_craft({output=item, recipe={{item00,item10},{item01,item11}})
4162 static int l_register_craft(lua_State *L)
4163 {
4164         //infostream<<"register_craft"<<std::endl;
4165         luaL_checktype(L, 1, LUA_TTABLE);
4166         int table = 1;
4167
4168         // Get the writable craft definition manager from the server
4169         IWritableCraftDefManager *craftdef =
4170                         get_server(L)->getWritableCraftDefManager();
4171
4172         std::string type = getstringfield_default(L, table, "type", "shaped");
4173
4174         /*
4175                 CraftDefinitionShaped
4176         */
4177         if(type == "shaped"){
4178                 std::string output = getstringfield_default(L, table, "output", "");
4179                 if(output == "")
4180                         throw LuaError(L, "Crafting definition is missing an output");
4181
4182                 int width = 0;
4183                 std::vector<std::string> recipe;
4184                 lua_getfield(L, table, "recipe");
4185                 if(lua_isnil(L, -1))
4186                         throw LuaError(L, "Crafting definition is missing a recipe"
4187                                         " (output=\"" + output + "\")");
4188                 if(!read_craft_recipe_shaped(L, -1, width, recipe))
4189                         throw LuaError(L, "Invalid crafting recipe"
4190                                         " (output=\"" + output + "\")");
4191
4192                 CraftReplacements replacements;
4193                 lua_getfield(L, table, "replacements");
4194                 if(!lua_isnil(L, -1))
4195                 {
4196                         if(!read_craft_replacements(L, -1, replacements))
4197                                 throw LuaError(L, "Invalid replacements"
4198                                                 " (output=\"" + output + "\")");
4199                 }
4200
4201                 CraftDefinition *def = new CraftDefinitionShaped(
4202                                 output, width, recipe, replacements);
4203                 craftdef->registerCraft(def);
4204         }
4205         /*
4206                 CraftDefinitionShapeless
4207         */
4208         else if(type == "shapeless"){
4209                 std::string output = getstringfield_default(L, table, "output", "");
4210                 if(output == "")
4211                         throw LuaError(L, "Crafting definition (shapeless)"
4212                                         " is missing an output");
4213
4214                 std::vector<std::string> recipe;
4215                 lua_getfield(L, table, "recipe");
4216                 if(lua_isnil(L, -1))
4217                         throw LuaError(L, "Crafting definition (shapeless)"
4218                                         " is missing a recipe"
4219                                         " (output=\"" + output + "\")");
4220                 if(!read_craft_recipe_shapeless(L, -1, recipe))
4221                         throw LuaError(L, "Invalid crafting recipe"
4222                                         " (output=\"" + output + "\")");
4223
4224                 CraftReplacements replacements;
4225                 lua_getfield(L, table, "replacements");
4226                 if(!lua_isnil(L, -1))
4227                 {
4228                         if(!read_craft_replacements(L, -1, replacements))
4229                                 throw LuaError(L, "Invalid replacements"
4230                                                 " (output=\"" + output + "\")");
4231                 }
4232
4233                 CraftDefinition *def = new CraftDefinitionShapeless(
4234                                 output, recipe, replacements);
4235                 craftdef->registerCraft(def);
4236         }
4237         /*
4238                 CraftDefinitionToolRepair
4239         */
4240         else if(type == "toolrepair"){
4241                 float additional_wear = getfloatfield_default(L, table,
4242                                 "additional_wear", 0.0);
4243
4244                 CraftDefinition *def = new CraftDefinitionToolRepair(
4245                                 additional_wear);
4246                 craftdef->registerCraft(def);
4247         }
4248         /*
4249                 CraftDefinitionCooking
4250         */
4251         else if(type == "cooking"){
4252                 std::string output = getstringfield_default(L, table, "output", "");
4253                 if(output == "")
4254                         throw LuaError(L, "Crafting definition (cooking)"
4255                                         " is missing an output");
4256
4257                 std::string recipe = getstringfield_default(L, table, "recipe", "");
4258                 if(recipe == "")
4259                         throw LuaError(L, "Crafting definition (cooking)"
4260                                         " is missing a recipe"
4261                                         " (output=\"" + output + "\")");
4262
4263                 float cooktime = getfloatfield_default(L, table, "cooktime", 3.0);
4264
4265                 CraftReplacements replacements;
4266                 lua_getfield(L, table, "replacements");
4267                 if(!lua_isnil(L, -1))
4268                 {
4269                         if(!read_craft_replacements(L, -1, replacements))
4270                                 throw LuaError(L, "Invalid replacements"
4271                                                 " (cooking output=\"" + output + "\")");
4272                 }
4273
4274                 CraftDefinition *def = new CraftDefinitionCooking(
4275                                 output, recipe, cooktime, replacements);
4276                 craftdef->registerCraft(def);
4277         }
4278         /*
4279                 CraftDefinitionFuel
4280         */
4281         else if(type == "fuel"){
4282                 std::string recipe = getstringfield_default(L, table, "recipe", "");
4283                 if(recipe == "")
4284                         throw LuaError(L, "Crafting definition (fuel)"
4285                                         " is missing a recipe");
4286
4287                 float burntime = getfloatfield_default(L, table, "burntime", 1.0);
4288
4289                 CraftReplacements replacements;
4290                 lua_getfield(L, table, "replacements");
4291                 if(!lua_isnil(L, -1))
4292                 {
4293                         if(!read_craft_replacements(L, -1, replacements))
4294                                 throw LuaError(L, "Invalid replacements"
4295                                                 " (fuel recipe=\"" + recipe + "\")");
4296                 }
4297
4298                 CraftDefinition *def = new CraftDefinitionFuel(
4299                                 recipe, burntime, replacements);
4300                 craftdef->registerCraft(def);
4301         }
4302         else
4303         {
4304                 throw LuaError(L, "Unknown crafting definition type: \"" + type + "\"");
4305         }
4306
4307         lua_pop(L, 1);
4308         return 0; /* number of results */
4309 }
4310
4311 // setting_set(name, value)
4312 static int l_setting_set(lua_State *L)
4313 {
4314         const char *name = luaL_checkstring(L, 1);
4315         const char *value = luaL_checkstring(L, 2);
4316         g_settings->set(name, value);
4317         return 0;
4318 }
4319
4320 // setting_get(name)
4321 static int l_setting_get(lua_State *L)
4322 {
4323         const char *name = luaL_checkstring(L, 1);
4324         try{
4325                 std::string value = g_settings->get(name);
4326                 lua_pushstring(L, value.c_str());
4327         } catch(SettingNotFoundException &e){
4328                 lua_pushnil(L);
4329         }
4330         return 1;
4331 }
4332
4333 // setting_getbool(name)
4334 static int l_setting_getbool(lua_State *L)
4335 {
4336         const char *name = luaL_checkstring(L, 1);
4337         try{
4338                 bool value = g_settings->getBool(name);
4339                 lua_pushboolean(L, value);
4340         } catch(SettingNotFoundException &e){
4341                 lua_pushnil(L);
4342         }
4343         return 1;
4344 }
4345
4346 // chat_send_all(text)
4347 static int l_chat_send_all(lua_State *L)
4348 {
4349         const char *text = luaL_checkstring(L, 1);
4350         // Get server from registry
4351         Server *server = get_server(L);
4352         // Send
4353         server->notifyPlayers(narrow_to_wide(text));
4354         return 0;
4355 }
4356
4357 // chat_send_player(name, text)
4358 static int l_chat_send_player(lua_State *L)
4359 {
4360         const char *name = luaL_checkstring(L, 1);
4361         const char *text = luaL_checkstring(L, 2);
4362         // Get server from registry
4363         Server *server = get_server(L);
4364         // Send
4365         server->notifyPlayer(name, narrow_to_wide(text));
4366         return 0;
4367 }
4368
4369 // get_player_privs(name, text)
4370 static int l_get_player_privs(lua_State *L)
4371 {
4372         const char *name = luaL_checkstring(L, 1);
4373         // Get server from registry
4374         Server *server = get_server(L);
4375         // Do it
4376         lua_newtable(L);
4377         int table = lua_gettop(L);
4378         std::set<std::string> privs_s = server->getPlayerEffectivePrivs(name);
4379         for(std::set<std::string>::const_iterator
4380                         i = privs_s.begin(); i != privs_s.end(); i++){
4381                 lua_pushboolean(L, true);
4382                 lua_setfield(L, table, i->c_str());
4383         }
4384         lua_pushvalue(L, table);
4385         return 1;
4386 }
4387
4388 // get_inventory(location)
4389 static int l_get_inventory(lua_State *L)
4390 {
4391         InventoryLocation loc;
4392
4393         std::string type = checkstringfield(L, 1, "type");
4394         if(type == "player"){
4395                 std::string name = checkstringfield(L, 1, "name");
4396                 loc.setPlayer(name);
4397         } else if(type == "node"){
4398                 lua_getfield(L, 1, "pos");
4399                 v3s16 pos = check_v3s16(L, -1);
4400                 loc.setNodeMeta(pos);
4401         }
4402
4403         if(get_server(L)->getInventory(loc) != NULL)
4404                 InvRef::create(L, loc);
4405         else
4406                 lua_pushnil(L);
4407         return 1;
4408 }
4409
4410 // get_dig_params(groups, tool_capabilities[, time_from_last_punch])
4411 static int l_get_dig_params(lua_State *L)
4412 {
4413         std::map<std::string, int> groups;
4414         read_groups(L, 1, groups);
4415         ToolCapabilities tp = read_tool_capabilities(L, 2);
4416         if(lua_isnoneornil(L, 3))
4417                 push_dig_params(L, getDigParams(groups, &tp));
4418         else
4419                 push_dig_params(L, getDigParams(groups, &tp,
4420                                         luaL_checknumber(L, 3)));
4421         return 1;
4422 }
4423
4424 // get_hit_params(groups, tool_capabilities[, time_from_last_punch])
4425 static int l_get_hit_params(lua_State *L)
4426 {
4427         std::map<std::string, int> groups;
4428         read_groups(L, 1, groups);
4429         ToolCapabilities tp = read_tool_capabilities(L, 2);
4430         if(lua_isnoneornil(L, 3))
4431                 push_hit_params(L, getHitParams(groups, &tp));
4432         else
4433                 push_hit_params(L, getHitParams(groups, &tp,
4434                                         luaL_checknumber(L, 3)));
4435         return 1;
4436 }
4437
4438 // get_current_modname()
4439 static int l_get_current_modname(lua_State *L)
4440 {
4441         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
4442         return 1;
4443 }
4444
4445 // get_modpath(modname)
4446 static int l_get_modpath(lua_State *L)
4447 {
4448         std::string modname = luaL_checkstring(L, 1);
4449         // Do it
4450         if(modname == "__builtin"){
4451                 std::string path = get_server(L)->getBuiltinLuaPath();
4452                 lua_pushstring(L, path.c_str());
4453                 return 1;
4454         }
4455         const ModSpec *mod = get_server(L)->getModSpec(modname);
4456         if(!mod){
4457                 lua_pushnil(L);
4458                 return 1;
4459         }
4460         lua_pushstring(L, mod->path.c_str());
4461         return 1;
4462 }
4463
4464 // get_modnames()
4465 // the returned list is sorted alphabetically for you
4466 static int l_get_modnames(lua_State *L)
4467 {
4468         // Get a list of mods
4469         core::list<std::string> mods_unsorted, mods_sorted;
4470         get_server(L)->getModNames(mods_unsorted);
4471
4472         // Take unsorted items from mods_unsorted and sort them into
4473         // mods_sorted; not great performance but the number of mods on a
4474         // server will likely be small.
4475         for(core::list<std::string>::Iterator i = mods_unsorted.begin();
4476             i != mods_unsorted.end(); i++)
4477         {
4478                 bool added = false;
4479                 for(core::list<std::string>::Iterator x = mods_sorted.begin();
4480                     x != mods_unsorted.end(); x++)
4481                 {
4482                         // I doubt anybody using Minetest will be using
4483                         // anything not ASCII based :)
4484                         if((*i).compare(*x) <= 0)
4485                         {
4486                                 mods_sorted.insert_before(x, *i);
4487                                 added = true;
4488                                 break;
4489                         }
4490                 }
4491                 if(!added)
4492                         mods_sorted.push_back(*i);
4493         }
4494
4495         // Get the table insertion function from Lua.
4496         lua_getglobal(L, "table");
4497         lua_getfield(L, -1, "insert");
4498         int insertion_func = lua_gettop(L);
4499
4500         // Package them up for Lua
4501         lua_newtable(L);
4502         int new_table = lua_gettop(L);
4503         core::list<std::string>::Iterator i = mods_sorted.begin();
4504         while(i != mods_sorted.end())
4505         {
4506                 lua_pushvalue(L, insertion_func);
4507                 lua_pushvalue(L, new_table);
4508                 lua_pushstring(L, (*i).c_str());
4509                 if(lua_pcall(L, 2, 0, 0) != 0)
4510                 {
4511                         script_error(L, "error: %s", lua_tostring(L, -1));
4512                 }
4513                 i++;
4514         }
4515         return 1;
4516 }
4517
4518 // get_worldpath()
4519 static int l_get_worldpath(lua_State *L)
4520 {
4521         std::string worldpath = get_server(L)->getWorldPath();
4522         lua_pushstring(L, worldpath.c_str());
4523         return 1;
4524 }
4525
4526 // sound_play(spec, parameters)
4527 static int l_sound_play(lua_State *L)
4528 {
4529         SimpleSoundSpec spec;
4530         read_soundspec(L, 1, spec);
4531         ServerSoundParams params;
4532         read_server_sound_params(L, 2, params);
4533         s32 handle = get_server(L)->playSound(spec, params);
4534         lua_pushinteger(L, handle);
4535         return 1;
4536 }
4537
4538 // sound_stop(handle)
4539 static int l_sound_stop(lua_State *L)
4540 {
4541         int handle = luaL_checkinteger(L, 1);
4542         get_server(L)->stopSound(handle);
4543         return 0;
4544 }
4545
4546 // is_singleplayer()
4547 static int l_is_singleplayer(lua_State *L)
4548 {
4549         lua_pushboolean(L, get_server(L)->isSingleplayer());
4550         return 1;
4551 }
4552
4553 // get_password_hash(name, raw_password)
4554 static int l_get_password_hash(lua_State *L)
4555 {
4556         std::string name = luaL_checkstring(L, 1);
4557         std::string raw_password = luaL_checkstring(L, 2);
4558         std::string hash = translatePassword(name,
4559                         narrow_to_wide(raw_password));
4560         lua_pushstring(L, hash.c_str());
4561         return 1;
4562 }
4563
4564 // notify_authentication_modified(name)
4565 static int l_notify_authentication_modified(lua_State *L)
4566 {
4567         std::string name = "";
4568         if(lua_isstring(L, 1))
4569                 name = lua_tostring(L, 1);
4570         get_server(L)->reportPrivsModified(name);
4571         return 0;
4572 }
4573
4574 // get_craft_result(input)
4575 static int l_get_craft_result(lua_State *L)
4576 {
4577         int input_i = 1;
4578         std::string method_s = getstringfield_default(L, input_i, "method", "normal");
4579         enum CraftMethod method = (CraftMethod)getenumfield(L, input_i, "method",
4580                                 es_CraftMethod, CRAFT_METHOD_NORMAL);
4581         int width = 1;
4582         lua_getfield(L, input_i, "width");
4583         if(lua_isnumber(L, -1))
4584                 width = luaL_checkinteger(L, -1);
4585         lua_pop(L, 1);
4586         lua_getfield(L, input_i, "items");
4587         std::vector<ItemStack> items = read_items(L, -1);
4588         lua_pop(L, 1); // items
4589
4590         IGameDef *gdef = get_server(L);
4591         ICraftDefManager *cdef = gdef->cdef();
4592         CraftInput input(method, width, items);
4593         CraftOutput output;
4594         bool got = cdef->getCraftResult(input, output, true, gdef);
4595         lua_newtable(L); // output table
4596         if(got){
4597                 ItemStack item;
4598                 item.deSerialize(output.item, gdef->idef());
4599                 LuaItemStack::create(L, item);
4600                 lua_setfield(L, -2, "item");
4601                 setintfield(L, -1, "time", output.time);
4602         } else {
4603                 LuaItemStack::create(L, ItemStack());
4604                 lua_setfield(L, -2, "item");
4605                 setintfield(L, -1, "time", 0);
4606         }
4607         lua_newtable(L); // decremented input table
4608         lua_pushstring(L, method_s.c_str());
4609         lua_setfield(L, -2, "method");
4610         lua_pushinteger(L, width);
4611         lua_setfield(L, -2, "width");
4612         push_items(L, input.items);
4613         lua_setfield(L, -2, "items");
4614         return 2;
4615 }
4616
4617 // get_craft_recipe(result item)
4618 static int l_get_craft_recipe(lua_State *L)
4619 {
4620         int k = 0;
4621         char tmp[20];
4622         int input_i = 1;
4623         std::string o_item = luaL_checkstring(L,input_i);
4624
4625         IGameDef *gdef = get_server(L);
4626         ICraftDefManager *cdef = gdef->cdef();
4627         CraftInput input;
4628         CraftOutput output(o_item,0);
4629         bool got = cdef->getCraftRecipe(input, output, gdef);
4630         lua_newtable(L); // output table
4631         if(got){
4632                 lua_newtable(L);
4633                 for(std::vector<ItemStack>::const_iterator
4634                         i = input.items.begin();
4635                         i != input.items.end(); i++, k++)
4636                 {
4637                         if (i->empty())
4638                         {
4639                                 continue;
4640                         }
4641                         sprintf(tmp,"%d",k);
4642                         lua_pushstring(L,tmp);
4643                         lua_pushstring(L,i->name.c_str());
4644                         lua_settable(L, -3);
4645                 }
4646                 lua_setfield(L, -2, "items");
4647                 setintfield(L, -1, "width", input.width);
4648                 switch (input.method) {
4649                 case CRAFT_METHOD_NORMAL:
4650                         lua_pushstring(L,"normal");
4651                         break;
4652                 case CRAFT_METHOD_COOKING:
4653                         lua_pushstring(L,"cooking");
4654                         break;
4655                 case CRAFT_METHOD_FUEL:
4656                         lua_pushstring(L,"fuel");
4657                         break;
4658                 default:
4659                         lua_pushstring(L,"unknown");
4660                 }
4661                 lua_setfield(L, -2, "type");
4662         } else {
4663                 lua_pushnil(L);
4664                 lua_setfield(L, -2, "items");
4665                 setintfield(L, -1, "width", 0);
4666         }
4667         return 1;
4668 }
4669
4670 static const struct luaL_Reg minetest_f [] = {
4671         {"debug", l_debug},
4672         {"log", l_log},
4673         {"register_item_raw", l_register_item_raw},
4674         {"register_alias_raw", l_register_alias_raw},
4675         {"register_craft", l_register_craft},
4676         {"setting_set", l_setting_set},
4677         {"setting_get", l_setting_get},
4678         {"setting_getbool", l_setting_getbool},
4679         {"chat_send_all", l_chat_send_all},
4680         {"chat_send_player", l_chat_send_player},
4681         {"get_player_privs", l_get_player_privs},
4682         {"get_inventory", l_get_inventory},
4683         {"get_dig_params", l_get_dig_params},
4684         {"get_hit_params", l_get_hit_params},
4685         {"get_current_modname", l_get_current_modname},
4686         {"get_modpath", l_get_modpath},
4687         {"get_modnames", l_get_modnames},
4688         {"get_worldpath", l_get_worldpath},
4689         {"sound_play", l_sound_play},
4690         {"sound_stop", l_sound_stop},
4691         {"is_singleplayer", l_is_singleplayer},
4692         {"get_password_hash", l_get_password_hash},
4693         {"notify_authentication_modified", l_notify_authentication_modified},
4694         {"get_craft_result", l_get_craft_result},
4695         {"get_craft_recipe", l_get_craft_recipe},
4696         {NULL, NULL}
4697 };
4698
4699 /*
4700         Main export function
4701 */
4702
4703 void scriptapi_export(lua_State *L, Server *server)
4704 {
4705         realitycheck(L);
4706         assert(lua_checkstack(L, 20));
4707         verbosestream<<"scriptapi_export()"<<std::endl;
4708         StackUnroller stack_unroller(L);
4709
4710         // Store server as light userdata in registry
4711         lua_pushlightuserdata(L, server);
4712         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_server");
4713
4714         // Register global functions in table minetest
4715         lua_newtable(L);
4716         luaL_register(L, NULL, minetest_f);
4717         lua_setglobal(L, "minetest");
4718
4719         // Get the main minetest table
4720         lua_getglobal(L, "minetest");
4721
4722         // Add tables to minetest
4723         lua_newtable(L);
4724         lua_setfield(L, -2, "object_refs");
4725         lua_newtable(L);
4726         lua_setfield(L, -2, "luaentities");
4727
4728         // Register wrappers
4729         LuaItemStack::Register(L);
4730         InvRef::Register(L);
4731         NodeMetaRef::Register(L);
4732         ObjectRef::Register(L);
4733         EnvRef::Register(L);
4734         LuaPseudoRandom::Register(L);
4735         LuaPerlinNoise::Register(L);
4736 }
4737
4738 bool scriptapi_loadmod(lua_State *L, const std::string &scriptpath,
4739                 const std::string &modname)
4740 {
4741         ModNameStorer modnamestorer(L, modname);
4742
4743         if(!string_allowed(modname, "abcdefghijklmnopqrstuvwxyz"
4744                         "0123456789_")){
4745                 errorstream<<"Error loading mod \""<<modname
4746                                 <<"\": modname does not follow naming conventions: "
4747                                 <<"Only chararacters [a-z0-9_] are allowed."<<std::endl;
4748                 return false;
4749         }
4750
4751         bool success = false;
4752
4753         try{
4754                 success = script_load(L, scriptpath.c_str());
4755         }
4756         catch(LuaError &e){
4757                 errorstream<<"Error loading mod \""<<modname
4758                                 <<"\": "<<e.what()<<std::endl;
4759         }
4760
4761         return success;
4762 }
4763
4764 void scriptapi_add_environment(lua_State *L, ServerEnvironment *env)
4765 {
4766         realitycheck(L);
4767         assert(lua_checkstack(L, 20));
4768         verbosestream<<"scriptapi_add_environment"<<std::endl;
4769         StackUnroller stack_unroller(L);
4770
4771         // Create EnvRef on stack
4772         EnvRef::create(L, env);
4773         int envref = lua_gettop(L);
4774
4775         // minetest.env = envref
4776         lua_getglobal(L, "minetest");
4777         luaL_checktype(L, -1, LUA_TTABLE);
4778         lua_pushvalue(L, envref);
4779         lua_setfield(L, -2, "env");
4780
4781         // Store environment as light userdata in registry
4782         lua_pushlightuserdata(L, env);
4783         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_env");
4784
4785         /*
4786                 Add ActiveBlockModifiers to environment
4787         */
4788
4789         // Get minetest.registered_abms
4790         lua_getglobal(L, "minetest");
4791         lua_getfield(L, -1, "registered_abms");
4792         luaL_checktype(L, -1, LUA_TTABLE);
4793         int registered_abms = lua_gettop(L);
4794
4795         if(lua_istable(L, registered_abms)){
4796                 int table = lua_gettop(L);
4797                 lua_pushnil(L);
4798                 while(lua_next(L, table) != 0){
4799                         // key at index -2 and value at index -1
4800                         int id = lua_tonumber(L, -2);
4801                         int current_abm = lua_gettop(L);
4802
4803                         std::set<std::string> trigger_contents;
4804                         lua_getfield(L, current_abm, "nodenames");
4805                         if(lua_istable(L, -1)){
4806                                 int table = lua_gettop(L);
4807                                 lua_pushnil(L);
4808                                 while(lua_next(L, table) != 0){
4809                                         // key at index -2 and value at index -1
4810                                         luaL_checktype(L, -1, LUA_TSTRING);
4811                                         trigger_contents.insert(lua_tostring(L, -1));
4812                                         // removes value, keeps key for next iteration
4813                                         lua_pop(L, 1);
4814                                 }
4815                         } else if(lua_isstring(L, -1)){
4816                                 trigger_contents.insert(lua_tostring(L, -1));
4817                         }
4818                         lua_pop(L, 1);
4819
4820                         std::set<std::string> required_neighbors;
4821                         lua_getfield(L, current_abm, "neighbors");
4822                         if(lua_istable(L, -1)){
4823                                 int table = lua_gettop(L);
4824                                 lua_pushnil(L);
4825                                 while(lua_next(L, table) != 0){
4826                                         // key at index -2 and value at index -1
4827                                         luaL_checktype(L, -1, LUA_TSTRING);
4828                                         required_neighbors.insert(lua_tostring(L, -1));
4829                                         // removes value, keeps key for next iteration
4830                                         lua_pop(L, 1);
4831                                 }
4832                         } else if(lua_isstring(L, -1)){
4833                                 required_neighbors.insert(lua_tostring(L, -1));
4834                         }
4835                         lua_pop(L, 1);
4836
4837                         float trigger_interval = 10.0;
4838                         getfloatfield(L, current_abm, "interval", trigger_interval);
4839
4840                         int trigger_chance = 50;
4841                         getintfield(L, current_abm, "chance", trigger_chance);
4842
4843                         LuaABM *abm = new LuaABM(L, id, trigger_contents,
4844                                         required_neighbors, trigger_interval, trigger_chance);
4845
4846                         env->addActiveBlockModifier(abm);
4847
4848                         // removes value, keeps key for next iteration
4849                         lua_pop(L, 1);
4850                 }
4851         }
4852         lua_pop(L, 1);
4853 }
4854
4855 #if 0
4856 // Dump stack top with the dump2 function
4857 static void dump2(lua_State *L, const char *name)
4858 {
4859         // Dump object (debug)
4860         lua_getglobal(L, "dump2");
4861         luaL_checktype(L, -1, LUA_TFUNCTION);
4862         lua_pushvalue(L, -2); // Get previous stack top as first parameter
4863         lua_pushstring(L, name);
4864         if(lua_pcall(L, 2, 0, 0))
4865                 script_error(L, "error: %s", lua_tostring(L, -1));
4866 }
4867 #endif
4868
4869 /*
4870         object_reference
4871 */
4872
4873 void scriptapi_add_object_reference(lua_State *L, ServerActiveObject *cobj)
4874 {
4875         realitycheck(L);
4876         assert(lua_checkstack(L, 20));
4877         //infostream<<"scriptapi_add_object_reference: id="<<cobj->getId()<<std::endl;
4878         StackUnroller stack_unroller(L);
4879
4880         // Create object on stack
4881         ObjectRef::create(L, cobj); // Puts ObjectRef (as userdata) on stack
4882         int object = lua_gettop(L);
4883
4884         // Get minetest.object_refs table
4885         lua_getglobal(L, "minetest");
4886         lua_getfield(L, -1, "object_refs");
4887         luaL_checktype(L, -1, LUA_TTABLE);
4888         int objectstable = lua_gettop(L);
4889
4890         // object_refs[id] = object
4891         lua_pushnumber(L, cobj->getId()); // Push id
4892         lua_pushvalue(L, object); // Copy object to top of stack
4893         lua_settable(L, objectstable);
4894 }
4895
4896 void scriptapi_rm_object_reference(lua_State *L, ServerActiveObject *cobj)
4897 {
4898         realitycheck(L);
4899         assert(lua_checkstack(L, 20));
4900         //infostream<<"scriptapi_rm_object_reference: id="<<cobj->getId()<<std::endl;
4901         StackUnroller stack_unroller(L);
4902
4903         // Get minetest.object_refs table
4904         lua_getglobal(L, "minetest");
4905         lua_getfield(L, -1, "object_refs");
4906         luaL_checktype(L, -1, LUA_TTABLE);
4907         int objectstable = lua_gettop(L);
4908
4909         // Get object_refs[id]
4910         lua_pushnumber(L, cobj->getId()); // Push id
4911         lua_gettable(L, objectstable);
4912         // Set object reference to NULL
4913         ObjectRef::set_null(L);
4914         lua_pop(L, 1); // pop object
4915
4916         // Set object_refs[id] = nil
4917         lua_pushnumber(L, cobj->getId()); // Push id
4918         lua_pushnil(L);
4919         lua_settable(L, objectstable);
4920 }
4921
4922 /*
4923         misc
4924 */
4925
4926 // What scriptapi_run_callbacks does with the return values of callbacks.
4927 // Regardless of the mode, if only one callback is defined,
4928 // its return value is the total return value.
4929 // Modes only affect the case where 0 or >= 2 callbacks are defined.
4930 enum RunCallbacksMode
4931 {
4932         // Returns the return value of the first callback
4933         // Returns nil if list of callbacks is empty
4934         RUN_CALLBACKS_MODE_FIRST,
4935         // Returns the return value of the last callback
4936         // Returns nil if list of callbacks is empty
4937         RUN_CALLBACKS_MODE_LAST,
4938         // If any callback returns a false value, the first such is returned
4939         // Otherwise, the first callback's return value (trueish) is returned
4940         // Returns true if list of callbacks is empty
4941         RUN_CALLBACKS_MODE_AND,
4942         // Like above, but stops calling callbacks (short circuit)
4943         // after seeing the first false value
4944         RUN_CALLBACKS_MODE_AND_SC,
4945         // If any callback returns a true value, the first such is returned
4946         // Otherwise, the first callback's return value (falseish) is returned
4947         // Returns false if list of callbacks is empty
4948         RUN_CALLBACKS_MODE_OR,
4949         // Like above, but stops calling callbacks (short circuit)
4950         // after seeing the first true value
4951         RUN_CALLBACKS_MODE_OR_SC,
4952         // Note: "a true value" and "a false value" refer to values that
4953         // are converted by lua_toboolean to true or false, respectively.
4954 };
4955
4956 // Push the list of callbacks (a lua table).
4957 // Then push nargs arguments.
4958 // Then call this function, which
4959 // - runs the callbacks
4960 // - removes the table and arguments from the lua stack
4961 // - pushes the return value, computed depending on mode
4962 static void scriptapi_run_callbacks(lua_State *L, int nargs,
4963                 RunCallbacksMode mode)
4964 {
4965         // Insert the return value into the lua stack, below the table
4966         assert(lua_gettop(L) >= nargs + 1);
4967         lua_pushnil(L);
4968         lua_insert(L, -(nargs + 1) - 1);
4969         // Stack now looks like this:
4970         // ... <return value = nil> <table> <arg#1> <arg#2> ... <arg#n>
4971
4972         int rv = lua_gettop(L) - nargs - 1;
4973         int table = rv + 1;
4974         int arg = table + 1;
4975
4976         luaL_checktype(L, table, LUA_TTABLE);
4977
4978         // Foreach
4979         lua_pushnil(L);
4980         bool first_loop = true;
4981         while(lua_next(L, table) != 0){
4982                 // key at index -2 and value at index -1
4983                 luaL_checktype(L, -1, LUA_TFUNCTION);
4984                 // Call function
4985                 for(int i = 0; i < nargs; i++)
4986                         lua_pushvalue(L, arg+i);
4987                 if(lua_pcall(L, nargs, 1, 0))
4988                         script_error(L, "error: %s", lua_tostring(L, -1));
4989
4990                 // Move return value to designated space in stack
4991                 // Or pop it
4992                 if(first_loop){
4993                         // Result of first callback is always moved
4994                         lua_replace(L, rv);
4995                         first_loop = false;
4996                 } else {
4997                         // Otherwise, what happens depends on the mode
4998                         if(mode == RUN_CALLBACKS_MODE_FIRST)
4999                                 lua_pop(L, 1);
5000                         else if(mode == RUN_CALLBACKS_MODE_LAST)
5001                                 lua_replace(L, rv);
5002                         else if(mode == RUN_CALLBACKS_MODE_AND ||
5003                                         mode == RUN_CALLBACKS_MODE_AND_SC){
5004                                 if(lua_toboolean(L, rv) == true &&
5005                                                 lua_toboolean(L, -1) == false)
5006                                         lua_replace(L, rv);
5007                                 else
5008                                         lua_pop(L, 1);
5009                         }
5010                         else if(mode == RUN_CALLBACKS_MODE_OR ||
5011                                         mode == RUN_CALLBACKS_MODE_OR_SC){
5012                                 if(lua_toboolean(L, rv) == false &&
5013                                                 lua_toboolean(L, -1) == true)
5014                                         lua_replace(L, rv);
5015                                 else
5016                                         lua_pop(L, 1);
5017                         }
5018                         else
5019                                 assert(0);
5020                 }
5021
5022                 // Handle short circuit modes
5023                 if(mode == RUN_CALLBACKS_MODE_AND_SC &&
5024                                 lua_toboolean(L, rv) == false)
5025                         break;
5026                 else if(mode == RUN_CALLBACKS_MODE_OR_SC &&
5027                                 lua_toboolean(L, rv) == true)
5028                         break;
5029
5030                 // value removed, keep key for next iteration
5031         }
5032
5033         // Remove stuff from stack, leaving only the return value
5034         lua_settop(L, rv);
5035
5036         // Fix return value in case no callbacks were called
5037         if(first_loop){
5038                 if(mode == RUN_CALLBACKS_MODE_AND ||
5039                                 mode == RUN_CALLBACKS_MODE_AND_SC){
5040                         lua_pop(L, 1);
5041                         lua_pushboolean(L, true);
5042                 }
5043                 else if(mode == RUN_CALLBACKS_MODE_OR ||
5044                                 mode == RUN_CALLBACKS_MODE_OR_SC){
5045                         lua_pop(L, 1);
5046                         lua_pushboolean(L, false);
5047                 }
5048         }
5049 }
5050
5051 bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
5052                 const std::string &message)
5053 {
5054         realitycheck(L);
5055         assert(lua_checkstack(L, 20));
5056         StackUnroller stack_unroller(L);
5057
5058         // Get minetest.registered_on_chat_messages
5059         lua_getglobal(L, "minetest");
5060         lua_getfield(L, -1, "registered_on_chat_messages");
5061         // Call callbacks
5062         lua_pushstring(L, name.c_str());
5063         lua_pushstring(L, message.c_str());
5064         scriptapi_run_callbacks(L, 2, RUN_CALLBACKS_MODE_OR_SC);
5065         bool ate = lua_toboolean(L, -1);
5066         return ate;
5067 }
5068
5069 void scriptapi_on_newplayer(lua_State *L, ServerActiveObject *player)
5070 {
5071         realitycheck(L);
5072         assert(lua_checkstack(L, 20));
5073         StackUnroller stack_unroller(L);
5074
5075         // Get minetest.registered_on_newplayers
5076         lua_getglobal(L, "minetest");
5077         lua_getfield(L, -1, "registered_on_newplayers");
5078         // Call callbacks
5079         objectref_get_or_create(L, player);
5080         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
5081 }
5082
5083 void scriptapi_on_dieplayer(lua_State *L, ServerActiveObject *player)
5084 {
5085         realitycheck(L);
5086         assert(lua_checkstack(L, 20));
5087         StackUnroller stack_unroller(L);
5088
5089         // Get minetest.registered_on_dieplayers
5090         lua_getglobal(L, "minetest");
5091         lua_getfield(L, -1, "registered_on_dieplayers");
5092         // Call callbacks
5093         objectref_get_or_create(L, player);
5094         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
5095 }
5096
5097 bool scriptapi_on_respawnplayer(lua_State *L, ServerActiveObject *player)
5098 {
5099         realitycheck(L);
5100         assert(lua_checkstack(L, 20));
5101         StackUnroller stack_unroller(L);
5102
5103         // Get minetest.registered_on_respawnplayers
5104         lua_getglobal(L, "minetest");
5105         lua_getfield(L, -1, "registered_on_respawnplayers");
5106         // Call callbacks
5107         objectref_get_or_create(L, player);
5108         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_OR);
5109         bool positioning_handled_by_some = lua_toboolean(L, -1);
5110         return positioning_handled_by_some;
5111 }
5112
5113 void scriptapi_on_joinplayer(lua_State *L, ServerActiveObject *player)
5114 {
5115         realitycheck(L);
5116         assert(lua_checkstack(L, 20));
5117         StackUnroller stack_unroller(L);
5118
5119         // Get minetest.registered_on_joinplayers
5120         lua_getglobal(L, "minetest");
5121         lua_getfield(L, -1, "registered_on_joinplayers");
5122         // Call callbacks
5123         objectref_get_or_create(L, player);
5124         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
5125 }
5126
5127 void scriptapi_on_leaveplayer(lua_State *L, ServerActiveObject *player)
5128 {
5129         realitycheck(L);
5130         assert(lua_checkstack(L, 20));
5131         StackUnroller stack_unroller(L);
5132
5133         // Get minetest.registered_on_leaveplayers
5134         lua_getglobal(L, "minetest");
5135         lua_getfield(L, -1, "registered_on_leaveplayers");
5136         // Call callbacks
5137         objectref_get_or_create(L, player);
5138         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
5139 }
5140
5141 void scriptapi_get_creative_inventory(lua_State *L, ServerActiveObject *player)
5142 {
5143         realitycheck(L);
5144         assert(lua_checkstack(L, 20));
5145         StackUnroller stack_unroller(L);
5146
5147         Inventory *inv = player->getInventory();
5148         assert(inv);
5149
5150         lua_getglobal(L, "minetest");
5151         lua_getfield(L, -1, "creative_inventory");
5152         luaL_checktype(L, -1, LUA_TTABLE);
5153         inventory_set_list_from_lua(inv, "main", L, -1, PLAYER_INVENTORY_SIZE);
5154 }
5155
5156 static void get_auth_handler(lua_State *L)
5157 {
5158         lua_getglobal(L, "minetest");
5159         lua_getfield(L, -1, "registered_auth_handler");
5160         if(lua_isnil(L, -1)){
5161                 lua_pop(L, 1);
5162                 lua_getfield(L, -1, "builtin_auth_handler");
5163         }
5164         if(lua_type(L, -1) != LUA_TTABLE)
5165                 throw LuaError(L, "Authentication handler table not valid");
5166 }
5167
5168 bool scriptapi_get_auth(lua_State *L, const std::string &playername,
5169                 std::string *dst_password, std::set<std::string> *dst_privs)
5170 {
5171         realitycheck(L);
5172         assert(lua_checkstack(L, 20));
5173         StackUnroller stack_unroller(L);
5174
5175         get_auth_handler(L);
5176         lua_getfield(L, -1, "get_auth");
5177         if(lua_type(L, -1) != LUA_TFUNCTION)
5178                 throw LuaError(L, "Authentication handler missing get_auth");
5179         lua_pushstring(L, playername.c_str());
5180         if(lua_pcall(L, 1, 1, 0))
5181                 script_error(L, "error: %s", lua_tostring(L, -1));
5182
5183         // nil = login not allowed
5184         if(lua_isnil(L, -1))
5185                 return false;
5186         luaL_checktype(L, -1, LUA_TTABLE);
5187
5188         std::string password;
5189         bool found = getstringfield(L, -1, "password", password);
5190         if(!found)
5191                 throw LuaError(L, "Authentication handler didn't return password");
5192         if(dst_password)
5193                 *dst_password = password;
5194
5195         lua_getfield(L, -1, "privileges");
5196         if(!lua_istable(L, -1))
5197                 throw LuaError(L,
5198                                 "Authentication handler didn't return privilege table");
5199         if(dst_privs)
5200                 read_privileges(L, -1, *dst_privs);
5201         lua_pop(L, 1);
5202
5203         return true;
5204 }
5205
5206 void scriptapi_create_auth(lua_State *L, const std::string &playername,
5207                 const std::string &password)
5208 {
5209         realitycheck(L);
5210         assert(lua_checkstack(L, 20));
5211         StackUnroller stack_unroller(L);
5212
5213         get_auth_handler(L);
5214         lua_getfield(L, -1, "create_auth");
5215         if(lua_type(L, -1) != LUA_TFUNCTION)
5216                 throw LuaError(L, "Authentication handler missing create_auth");
5217         lua_pushstring(L, playername.c_str());
5218         lua_pushstring(L, password.c_str());
5219         if(lua_pcall(L, 2, 0, 0))
5220                 script_error(L, "error: %s", lua_tostring(L, -1));
5221 }
5222
5223 bool scriptapi_set_password(lua_State *L, const std::string &playername,
5224                 const std::string &password)
5225 {
5226         realitycheck(L);
5227         assert(lua_checkstack(L, 20));
5228         StackUnroller stack_unroller(L);
5229
5230         get_auth_handler(L);
5231         lua_getfield(L, -1, "set_password");
5232         if(lua_type(L, -1) != LUA_TFUNCTION)
5233                 throw LuaError(L, "Authentication handler missing set_password");
5234         lua_pushstring(L, playername.c_str());
5235         lua_pushstring(L, password.c_str());
5236         if(lua_pcall(L, 2, 1, 0))
5237                 script_error(L, "error: %s", lua_tostring(L, -1));
5238         return lua_toboolean(L, -1);
5239 }
5240
5241 /*
5242         item callbacks and node callbacks
5243 */
5244
5245 // Retrieves minetest.registered_items[name][callbackname]
5246 // If that is nil or on error, return false and stack is unchanged
5247 // If that is a function, returns true and pushes the
5248 // function onto the stack
5249 static bool get_item_callback(lua_State *L,
5250                 const char *name, const char *callbackname)
5251 {
5252         lua_getglobal(L, "minetest");
5253         lua_getfield(L, -1, "registered_items");
5254         lua_remove(L, -2);
5255         luaL_checktype(L, -1, LUA_TTABLE);
5256         lua_getfield(L, -1, name);
5257         lua_remove(L, -2);
5258         // Should be a table
5259         if(lua_type(L, -1) != LUA_TTABLE)
5260         {
5261                 errorstream<<"Item \""<<name<<"\" not defined"<<std::endl;
5262                 lua_pop(L, 1);
5263                 return false;
5264         }
5265         lua_getfield(L, -1, callbackname);
5266         lua_remove(L, -2);
5267         // Should be a function or nil
5268         if(lua_type(L, -1) == LUA_TFUNCTION)
5269         {
5270                 return true;
5271         }
5272         else if(lua_isnil(L, -1))
5273         {
5274                 lua_pop(L, 1);
5275                 return false;
5276         }
5277         else
5278         {
5279                 errorstream<<"Item \""<<name<<"\" callback \""
5280                         <<callbackname<<" is not a function"<<std::endl;
5281                 lua_pop(L, 1);
5282                 return false;
5283         }
5284 }
5285
5286 bool scriptapi_item_on_drop(lua_State *L, ItemStack &item,
5287                 ServerActiveObject *dropper, v3f pos)
5288 {
5289         realitycheck(L);
5290         assert(lua_checkstack(L, 20));
5291         StackUnroller stack_unroller(L);
5292
5293         // Push callback function on stack
5294         if(!get_item_callback(L, item.name.c_str(), "on_drop"))
5295                 return false;
5296
5297         // Call function
5298         LuaItemStack::create(L, item);
5299         objectref_get_or_create(L, dropper);
5300         pushFloatPos(L, pos);
5301         if(lua_pcall(L, 3, 1, 0))
5302                 script_error(L, "error: %s", lua_tostring(L, -1));
5303         if(!lua_isnil(L, -1))
5304                 item = read_item(L, -1);
5305         return true;
5306 }
5307
5308 bool scriptapi_item_on_place(lua_State *L, ItemStack &item,
5309                 ServerActiveObject *placer, const PointedThing &pointed)
5310 {
5311         realitycheck(L);
5312         assert(lua_checkstack(L, 20));
5313         StackUnroller stack_unroller(L);
5314
5315         // Push callback function on stack
5316         if(!get_item_callback(L, item.name.c_str(), "on_place"))
5317                 return false;
5318
5319         // Call function
5320         LuaItemStack::create(L, item);
5321         objectref_get_or_create(L, placer);
5322         push_pointed_thing(L, pointed);
5323         if(lua_pcall(L, 3, 1, 0))
5324                 script_error(L, "error: %s", lua_tostring(L, -1));
5325         if(!lua_isnil(L, -1))
5326                 item = read_item(L, -1);
5327         return true;
5328 }
5329
5330 bool scriptapi_item_on_use(lua_State *L, ItemStack &item,
5331                 ServerActiveObject *user, const PointedThing &pointed)
5332 {
5333         realitycheck(L);
5334         assert(lua_checkstack(L, 20));
5335         StackUnroller stack_unroller(L);
5336
5337         // Push callback function on stack
5338         if(!get_item_callback(L, item.name.c_str(), "on_use"))
5339                 return false;
5340
5341         // Call function
5342         LuaItemStack::create(L, item);
5343         objectref_get_or_create(L, user);
5344         push_pointed_thing(L, pointed);
5345         if(lua_pcall(L, 3, 1, 0))
5346                 script_error(L, "error: %s", lua_tostring(L, -1));
5347         if(!lua_isnil(L, -1))
5348                 item = read_item(L, -1);
5349         return true;
5350 }
5351
5352 bool scriptapi_node_on_punch(lua_State *L, v3s16 p, MapNode node,
5353                 ServerActiveObject *puncher)
5354 {
5355         realitycheck(L);
5356         assert(lua_checkstack(L, 20));
5357         StackUnroller stack_unroller(L);
5358
5359         INodeDefManager *ndef = get_server(L)->ndef();
5360
5361         // Push callback function on stack
5362         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_punch"))
5363                 return false;
5364
5365         // Call function
5366         push_v3s16(L, p);
5367         pushnode(L, node, ndef);
5368         objectref_get_or_create(L, puncher);
5369         if(lua_pcall(L, 3, 0, 0))
5370                 script_error(L, "error: %s", lua_tostring(L, -1));
5371         return true;
5372 }
5373
5374 bool scriptapi_node_on_dig(lua_State *L, v3s16 p, MapNode node,
5375                 ServerActiveObject *digger)
5376 {
5377         realitycheck(L);
5378         assert(lua_checkstack(L, 20));
5379         StackUnroller stack_unroller(L);
5380
5381         INodeDefManager *ndef = get_server(L)->ndef();
5382
5383         // Push callback function on stack
5384         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_dig"))
5385                 return false;
5386
5387         // Call function
5388         push_v3s16(L, p);
5389         pushnode(L, node, ndef);
5390         objectref_get_or_create(L, digger);
5391         if(lua_pcall(L, 3, 0, 0))
5392                 script_error(L, "error: %s", lua_tostring(L, -1));
5393         return true;
5394 }
5395
5396 void scriptapi_node_on_construct(lua_State *L, v3s16 p, MapNode node)
5397 {
5398         realitycheck(L);
5399         assert(lua_checkstack(L, 20));
5400         StackUnroller stack_unroller(L);
5401
5402         INodeDefManager *ndef = get_server(L)->ndef();
5403
5404         // Push callback function on stack
5405         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_construct"))
5406                 return;
5407
5408         // Call function
5409         push_v3s16(L, p);
5410         if(lua_pcall(L, 1, 0, 0))
5411                 script_error(L, "error: %s", lua_tostring(L, -1));
5412 }
5413
5414 void scriptapi_node_on_destruct(lua_State *L, v3s16 p, MapNode node)
5415 {
5416         realitycheck(L);
5417         assert(lua_checkstack(L, 20));
5418         StackUnroller stack_unroller(L);
5419
5420         INodeDefManager *ndef = get_server(L)->ndef();
5421
5422         // Push callback function on stack
5423         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_destruct"))
5424                 return;
5425
5426         // Call function
5427         push_v3s16(L, p);
5428         if(lua_pcall(L, 1, 0, 0))
5429                 script_error(L, "error: %s", lua_tostring(L, -1));
5430 }
5431
5432 void scriptapi_node_after_destruct(lua_State *L, v3s16 p, MapNode node)
5433 {
5434         realitycheck(L);
5435         assert(lua_checkstack(L, 20));
5436         StackUnroller stack_unroller(L);
5437
5438         INodeDefManager *ndef = get_server(L)->ndef();
5439
5440         // Push callback function on stack
5441         if(!get_item_callback(L, ndef->get(node).name.c_str(), "after_destruct"))
5442                 return;
5443
5444         // Call function
5445         push_v3s16(L, p);
5446         pushnode(L, node, ndef);
5447         if(lua_pcall(L, 2, 0, 0))
5448                 script_error(L, "error: %s", lua_tostring(L, -1));
5449 }
5450
5451 void scriptapi_node_on_receive_fields(lua_State *L, v3s16 p,
5452                 const std::string &formname,
5453                 const std::map<std::string, std::string> &fields,
5454                 ServerActiveObject *sender)
5455 {
5456         realitycheck(L);
5457         assert(lua_checkstack(L, 20));
5458         StackUnroller stack_unroller(L);
5459
5460         INodeDefManager *ndef = get_server(L)->ndef();
5461
5462         // If node doesn't exist, we don't know what callback to call
5463         MapNode node = get_env(L)->getMap().getNodeNoEx(p);
5464         if(node.getContent() == CONTENT_IGNORE)
5465                 return;
5466
5467         // Push callback function on stack
5468         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_receive_fields"))
5469                 return;
5470
5471         // Call function
5472         // param 1
5473         push_v3s16(L, p);
5474         // param 2
5475         lua_pushstring(L, formname.c_str());
5476         // param 3
5477         lua_newtable(L);
5478         for(std::map<std::string, std::string>::const_iterator
5479                         i = fields.begin(); i != fields.end(); i++){
5480                 const std::string &name = i->first;
5481                 const std::string &value = i->second;
5482                 lua_pushstring(L, name.c_str());
5483                 lua_pushlstring(L, value.c_str(), value.size());
5484                 lua_settable(L, -3);
5485         }
5486         // param 4
5487         objectref_get_or_create(L, sender);
5488         if(lua_pcall(L, 4, 0, 0))
5489                 script_error(L, "error: %s", lua_tostring(L, -1));
5490 }
5491
5492 void scriptapi_node_on_metadata_inventory_move(lua_State *L, v3s16 p,
5493                 const std::string &from_list, int from_index,
5494                 const std::string &to_list, int to_index,
5495                 int count, ServerActiveObject *player)
5496 {
5497         realitycheck(L);
5498         assert(lua_checkstack(L, 20));
5499         StackUnroller stack_unroller(L);
5500
5501         INodeDefManager *ndef = get_server(L)->ndef();
5502
5503         // If node doesn't exist, we don't know what callback to call
5504         MapNode node = get_env(L)->getMap().getNodeNoEx(p);
5505         if(node.getContent() == CONTENT_IGNORE)
5506                 return;
5507
5508         // Push callback function on stack
5509         if(!get_item_callback(L, ndef->get(node).name.c_str(),
5510                         "on_metadata_inventory_move"))
5511                 return;
5512
5513         // function(pos, from_list, from_index, to_list, to_index, count, player)
5514         push_v3s16(L, p);
5515         lua_pushstring(L, from_list.c_str());
5516         lua_pushinteger(L, from_index + 1);
5517         lua_pushstring(L, to_list.c_str());
5518         lua_pushinteger(L, to_index + 1);
5519         lua_pushinteger(L, count);
5520         objectref_get_or_create(L, player);
5521         if(lua_pcall(L, 7, 0, 0))
5522                 script_error(L, "error: %s", lua_tostring(L, -1));
5523 }
5524
5525 ItemStack scriptapi_node_on_metadata_inventory_offer(lua_State *L, v3s16 p,
5526                 const std::string &listname, int index, ItemStack &stack,
5527                 ServerActiveObject *player)
5528 {
5529         realitycheck(L);
5530         assert(lua_checkstack(L, 20));
5531         StackUnroller stack_unroller(L);
5532
5533         INodeDefManager *ndef = get_server(L)->ndef();
5534
5535         // If node doesn't exist, we don't know what callback to call
5536         MapNode node = get_env(L)->getMap().getNodeNoEx(p);
5537         if(node.getContent() == CONTENT_IGNORE)
5538                 return stack;
5539
5540         // Push callback function on stack
5541         if(!get_item_callback(L, ndef->get(node).name.c_str(),
5542                         "on_metadata_inventory_offer"))
5543                 return stack;
5544
5545         // Call function(pos, listname, index, stack, player)
5546         push_v3s16(L, p);
5547         lua_pushstring(L, listname.c_str());
5548         lua_pushinteger(L, index + 1);
5549         LuaItemStack::create(L, stack);
5550         objectref_get_or_create(L, player);
5551         if(lua_pcall(L, 5, 1, 0))
5552                 script_error(L, "error: %s", lua_tostring(L, -1));
5553         return read_item(L, -1);
5554 }
5555
5556 ItemStack scriptapi_node_on_metadata_inventory_take(lua_State *L, v3s16 p,
5557                 const std::string &listname, int index, int count,
5558                 ServerActiveObject *player)
5559 {
5560         realitycheck(L);
5561         assert(lua_checkstack(L, 20));
5562         StackUnroller stack_unroller(L);
5563
5564         INodeDefManager *ndef = get_server(L)->ndef();
5565
5566         // If node doesn't exist, we don't know what callback to call
5567         MapNode node = get_env(L)->getMap().getNodeNoEx(p);
5568         if(node.getContent() == CONTENT_IGNORE)
5569                 return ItemStack();
5570
5571         // Push callback function on stack
5572         if(!get_item_callback(L, ndef->get(node).name.c_str(),
5573                         "on_metadata_inventory_take"))
5574                 return ItemStack();
5575
5576         // Call function(pos, listname, index, count, player)
5577         push_v3s16(L, p);
5578         lua_pushstring(L, listname.c_str());
5579         lua_pushinteger(L, index + 1);
5580         lua_pushinteger(L, count);
5581         objectref_get_or_create(L, player);
5582         if(lua_pcall(L, 5, 1, 0))
5583                 script_error(L, "error: %s", lua_tostring(L, -1));
5584         return read_item(L, -1);
5585 }
5586
5587 /*
5588         environment
5589 */
5590
5591 void scriptapi_environment_step(lua_State *L, float dtime)
5592 {
5593         realitycheck(L);
5594         assert(lua_checkstack(L, 20));
5595         //infostream<<"scriptapi_environment_step"<<std::endl;
5596         StackUnroller stack_unroller(L);
5597
5598         // Get minetest.registered_globalsteps
5599         lua_getglobal(L, "minetest");
5600         lua_getfield(L, -1, "registered_globalsteps");
5601         // Call callbacks
5602         lua_pushnumber(L, dtime);
5603         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
5604 }
5605
5606 void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp,
5607                 u32 blockseed)
5608 {
5609         realitycheck(L);
5610         assert(lua_checkstack(L, 20));
5611         //infostream<<"scriptapi_environment_on_generated"<<std::endl;
5612         StackUnroller stack_unroller(L);
5613
5614         // Get minetest.registered_on_generateds
5615         lua_getglobal(L, "minetest");
5616         lua_getfield(L, -1, "registered_on_generateds");
5617         // Call callbacks
5618         push_v3s16(L, minp);
5619         push_v3s16(L, maxp);
5620         lua_pushnumber(L, blockseed);
5621         scriptapi_run_callbacks(L, 3, RUN_CALLBACKS_MODE_FIRST);
5622 }
5623
5624 /*
5625         luaentity
5626 */
5627
5628 bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name)
5629 {
5630         realitycheck(L);
5631         assert(lua_checkstack(L, 20));
5632         verbosestream<<"scriptapi_luaentity_add: id="<<id<<" name=\""
5633                         <<name<<"\""<<std::endl;
5634         StackUnroller stack_unroller(L);
5635
5636         // Get minetest.registered_entities[name]
5637         lua_getglobal(L, "minetest");
5638         lua_getfield(L, -1, "registered_entities");
5639         luaL_checktype(L, -1, LUA_TTABLE);
5640         lua_pushstring(L, name);
5641         lua_gettable(L, -2);
5642         // Should be a table, which we will use as a prototype
5643         //luaL_checktype(L, -1, LUA_TTABLE);
5644         if(lua_type(L, -1) != LUA_TTABLE){
5645                 errorstream<<"LuaEntity name \""<<name<<"\" not defined"<<std::endl;
5646                 return false;
5647         }
5648         int prototype_table = lua_gettop(L);
5649         //dump2(L, "prototype_table");
5650
5651         // Create entity object
5652         lua_newtable(L);
5653         int object = lua_gettop(L);
5654
5655         // Set object metatable
5656         lua_pushvalue(L, prototype_table);
5657         lua_setmetatable(L, -2);
5658
5659         // Add object reference
5660         // This should be userdata with metatable ObjectRef
5661         objectref_get(L, id);
5662         luaL_checktype(L, -1, LUA_TUSERDATA);
5663         if(!luaL_checkudata(L, -1, "ObjectRef"))
5664                 luaL_typerror(L, -1, "ObjectRef");
5665         lua_setfield(L, -2, "object");
5666
5667         // minetest.luaentities[id] = object
5668         lua_getglobal(L, "minetest");
5669         lua_getfield(L, -1, "luaentities");
5670         luaL_checktype(L, -1, LUA_TTABLE);
5671         lua_pushnumber(L, id); // Push id
5672         lua_pushvalue(L, object); // Copy object to top of stack
5673         lua_settable(L, -3);
5674
5675         return true;
5676 }
5677
5678 void scriptapi_luaentity_activate(lua_State *L, u16 id,
5679                 const std::string &staticdata)
5680 {
5681         realitycheck(L);
5682         assert(lua_checkstack(L, 20));
5683         verbosestream<<"scriptapi_luaentity_activate: id="<<id<<std::endl;
5684         StackUnroller stack_unroller(L);
5685
5686         // Get minetest.luaentities[id]
5687         luaentity_get(L, id);
5688         int object = lua_gettop(L);
5689
5690         // Get on_activate function
5691         lua_pushvalue(L, object);
5692         lua_getfield(L, -1, "on_activate");
5693         if(!lua_isnil(L, -1)){
5694                 luaL_checktype(L, -1, LUA_TFUNCTION);
5695                 lua_pushvalue(L, object); // self
5696                 lua_pushlstring(L, staticdata.c_str(), staticdata.size());
5697                 // Call with 2 arguments, 0 results
5698                 if(lua_pcall(L, 2, 0, 0))
5699                         script_error(L, "error running function on_activate: %s\n",
5700                                         lua_tostring(L, -1));
5701         }
5702 }
5703
5704 void scriptapi_luaentity_rm(lua_State *L, u16 id)
5705 {
5706         realitycheck(L);
5707         assert(lua_checkstack(L, 20));
5708         verbosestream<<"scriptapi_luaentity_rm: id="<<id<<std::endl;
5709
5710         // Get minetest.luaentities table
5711         lua_getglobal(L, "minetest");
5712         lua_getfield(L, -1, "luaentities");
5713         luaL_checktype(L, -1, LUA_TTABLE);
5714         int objectstable = lua_gettop(L);
5715
5716         // Set luaentities[id] = nil
5717         lua_pushnumber(L, id); // Push id
5718         lua_pushnil(L);
5719         lua_settable(L, objectstable);
5720
5721         lua_pop(L, 2); // pop luaentities, minetest
5722 }
5723
5724 std::string scriptapi_luaentity_get_staticdata(lua_State *L, u16 id)
5725 {
5726         realitycheck(L);
5727         assert(lua_checkstack(L, 20));
5728         //infostream<<"scriptapi_luaentity_get_staticdata: id="<<id<<std::endl;
5729         StackUnroller stack_unroller(L);
5730
5731         // Get minetest.luaentities[id]
5732         luaentity_get(L, id);
5733         int object = lua_gettop(L);
5734
5735         // Get get_staticdata function
5736         lua_pushvalue(L, object);
5737         lua_getfield(L, -1, "get_staticdata");
5738         if(lua_isnil(L, -1))
5739                 return "";
5740
5741         luaL_checktype(L, -1, LUA_TFUNCTION);
5742         lua_pushvalue(L, object); // self
5743         // Call with 1 arguments, 1 results
5744         if(lua_pcall(L, 1, 1, 0))
5745                 script_error(L, "error running function get_staticdata: %s\n",
5746                                 lua_tostring(L, -1));
5747
5748         size_t len=0;
5749         const char *s = lua_tolstring(L, -1, &len);
5750         return std::string(s, len);
5751 }
5752
5753 void scriptapi_luaentity_get_properties(lua_State *L, u16 id,
5754                 ObjectProperties *prop)
5755 {
5756         realitycheck(L);
5757         assert(lua_checkstack(L, 20));
5758         //infostream<<"scriptapi_luaentity_get_properties: id="<<id<<std::endl;
5759         StackUnroller stack_unroller(L);
5760
5761         // Get minetest.luaentities[id]
5762         luaentity_get(L, id);
5763         //int object = lua_gettop(L);
5764
5765         // Set default values that differ from ObjectProperties defaults
5766         prop->hp_max = 10;
5767
5768         /* Read stuff */
5769
5770         prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
5771
5772         getboolfield(L, -1, "physical", prop->physical);
5773
5774         getfloatfield(L, -1, "weight", prop->weight);
5775
5776         lua_getfield(L, -1, "collisionbox");
5777         if(lua_istable(L, -1))
5778                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
5779         lua_pop(L, 1);
5780
5781         getstringfield(L, -1, "visual", prop->visual);
5782
5783         // Deprecated: read object properties directly
5784         read_object_properties(L, -1, prop);
5785
5786         // Read initial_properties
5787         lua_getfield(L, -1, "initial_properties");
5788         read_object_properties(L, -1, prop);
5789         lua_pop(L, 1);
5790 }
5791
5792 void scriptapi_luaentity_step(lua_State *L, u16 id, float dtime)
5793 {
5794         realitycheck(L);
5795         assert(lua_checkstack(L, 20));
5796         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5797         StackUnroller stack_unroller(L);
5798
5799         // Get minetest.luaentities[id]
5800         luaentity_get(L, id);
5801         int object = lua_gettop(L);
5802         // State: object is at top of stack
5803         // Get step function
5804         lua_getfield(L, -1, "on_step");
5805         if(lua_isnil(L, -1))
5806                 return;
5807         luaL_checktype(L, -1, LUA_TFUNCTION);
5808         lua_pushvalue(L, object); // self
5809         lua_pushnumber(L, dtime); // dtime
5810         // Call with 2 arguments, 0 results
5811         if(lua_pcall(L, 2, 0, 0))
5812                 script_error(L, "error running function 'on_step': %s\n", lua_tostring(L, -1));
5813 }
5814
5815 // Calls entity:on_punch(ObjectRef puncher, time_from_last_punch,
5816 //                       tool_capabilities, direction)
5817 void scriptapi_luaentity_punch(lua_State *L, u16 id,
5818                 ServerActiveObject *puncher, float time_from_last_punch,
5819                 const ToolCapabilities *toolcap, v3f dir)
5820 {
5821         realitycheck(L);
5822         assert(lua_checkstack(L, 20));
5823         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5824         StackUnroller stack_unroller(L);
5825
5826         // Get minetest.luaentities[id]
5827         luaentity_get(L, id);
5828         int object = lua_gettop(L);
5829         // State: object is at top of stack
5830         // Get function
5831         lua_getfield(L, -1, "on_punch");
5832         if(lua_isnil(L, -1))
5833                 return;
5834         luaL_checktype(L, -1, LUA_TFUNCTION);
5835         lua_pushvalue(L, object); // self
5836         objectref_get_or_create(L, puncher); // Clicker reference
5837         lua_pushnumber(L, time_from_last_punch);
5838         push_tool_capabilities(L, *toolcap);
5839         push_v3f(L, dir);
5840         // Call with 5 arguments, 0 results
5841         if(lua_pcall(L, 5, 0, 0))
5842                 script_error(L, "error running function 'on_punch': %s\n", lua_tostring(L, -1));
5843 }
5844
5845 // Calls entity:on_rightclick(ObjectRef clicker)
5846 void scriptapi_luaentity_rightclick(lua_State *L, u16 id,
5847                 ServerActiveObject *clicker)
5848 {
5849         realitycheck(L);
5850         assert(lua_checkstack(L, 20));
5851         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5852         StackUnroller stack_unroller(L);
5853
5854         // Get minetest.luaentities[id]
5855         luaentity_get(L, id);
5856         int object = lua_gettop(L);
5857         // State: object is at top of stack
5858         // Get function
5859         lua_getfield(L, -1, "on_rightclick");
5860         if(lua_isnil(L, -1))
5861                 return;
5862         luaL_checktype(L, -1, LUA_TFUNCTION);
5863         lua_pushvalue(L, object); // self
5864         objectref_get_or_create(L, clicker); // Clicker reference
5865         // Call with 2 arguments, 0 results
5866         if(lua_pcall(L, 2, 0, 0))
5867                 script_error(L, "error running function 'on_rightclick': %s\n", lua_tostring(L, -1));
5868 }
5869