src/scriptapi.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "scriptapi.h"
  21
  22 #include <iostream>
  23 #include <list>
  24 extern "C" {
  25 #include <lua.h>
  26 #include <lualib.h>
  27 #include <lauxlib.h>
  28 }
  29
  30 #include "log.h"
  31 #include "server.h"
  32 #include "porting.h"
  33 #include "filesys.h"
  34 #include "serverobject.h"
  35 #include "script.h"
  36 #include "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 "utility.h"
  47 #include "tool.h"
  48 #include "daynightratio.h"
  49 #include "noise.h" // PseudoRandom for LuaPseudoRandom
  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         {0, NULL},
 386 };
 387
 388 struct EnumString es_ContentParamType[] =
 389 {
 390         {CPT_NONE, "none"},
 391         {CPT_LIGHT, "light"},
 392         {0, NULL},
 393 };
 394
 395 struct EnumString es_ContentParamType2[] =
 396 {
 397         {CPT2_NONE, "none"},
 398         {CPT2_FULL, "full"},
 399         {CPT2_FLOWINGLIQUID, "flowingliquid"},
 400         {CPT2_FACEDIR, "facedir"},
 401         {CPT2_WALLMOUNTED, "wallmounted"},
 402         {0, NULL},
 403 };
 404
 405 struct EnumString es_LiquidType[] =
 406 {
 407         {LIQUID_NONE, "none"},
 408         {LIQUID_FLOWING, "flowing"},
 409         {LIQUID_SOURCE, "source"},
 410         {0, NULL},
 411 };
 412
 413 struct EnumString es_NodeBoxType[] =
 414 {
 415         {NODEBOX_REGULAR, "regular"},
 416         {NODEBOX_FIXED, "fixed"},
 417         {NODEBOX_WALLMOUNTED, "wallmounted"},
 418         {0, NULL},
 419 };
 420
 421 /*
 422         C struct <-> Lua table converter functions
 423 */
 424
 425 static void push_v3f(lua_State *L, v3f p)
 426 {
 427         lua_newtable(L);
 428         lua_pushnumber(L, p.X);
 429         lua_setfield(L, -2, "x");
 430         lua_pushnumber(L, p.Y);
 431         lua_setfield(L, -2, "y");
 432         lua_pushnumber(L, p.Z);
 433         lua_setfield(L, -2, "z");
 434 }
 435
 436 static v2s16 read_v2s16(lua_State *L, int index)
 437 {
 438         v2s16 p;
 439         luaL_checktype(L, index, LUA_TTABLE);
 440         lua_getfield(L, index, "x");
 441         p.X = lua_tonumber(L, -1);
 442         lua_pop(L, 1);
 443         lua_getfield(L, index, "y");
 444         p.Y = lua_tonumber(L, -1);
 445         lua_pop(L, 1);
 446         return p;
 447 }
 448
 449 static v2f read_v2f(lua_State *L, int index)
 450 {
 451         v2f p;
 452         luaL_checktype(L, index, LUA_TTABLE);
 453         lua_getfield(L, index, "x");
 454         p.X = lua_tonumber(L, -1);
 455         lua_pop(L, 1);
 456         lua_getfield(L, index, "y");
 457         p.Y = lua_tonumber(L, -1);
 458         lua_pop(L, 1);
 459         return p;
 460 }
 461
 462 static v3f read_v3f(lua_State *L, int index)
 463 {
 464         v3f pos;
 465         luaL_checktype(L, index, LUA_TTABLE);
 466         lua_getfield(L, index, "x");
 467         pos.X = lua_tonumber(L, -1);
 468         lua_pop(L, 1);
 469         lua_getfield(L, index, "y");
 470         pos.Y = lua_tonumber(L, -1);
 471         lua_pop(L, 1);
 472         lua_getfield(L, index, "z");
 473         pos.Z = lua_tonumber(L, -1);
 474         lua_pop(L, 1);
 475         return pos;
 476 }
 477
 478 static v3f check_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 = luaL_checknumber(L, -1);
 484         lua_pop(L, 1);
 485         lua_getfield(L, index, "y");
 486         pos.Y = luaL_checknumber(L, -1);
 487         lua_pop(L, 1);
 488         lua_getfield(L, index, "z");
 489         pos.Z = luaL_checknumber(L, -1);
 490         lua_pop(L, 1);
 491         return pos;
 492 }
 493
 494 static void pushFloatPos(lua_State *L, v3f p)
 495 {
 496         p /= BS;
 497         push_v3f(L, p);
 498 }
 499
 500 static v3f checkFloatPos(lua_State *L, int index)
 501 {
 502         return check_v3f(L, index) * BS;
 503 }
 504
 505 static void push_v3s16(lua_State *L, v3s16 p)
 506 {
 507         lua_newtable(L);
 508         lua_pushnumber(L, p.X);
 509         lua_setfield(L, -2, "x");
 510         lua_pushnumber(L, p.Y);
 511         lua_setfield(L, -2, "y");
 512         lua_pushnumber(L, p.Z);
 513         lua_setfield(L, -2, "z");
 514 }
 515
 516 static v3s16 read_v3s16(lua_State *L, int index)
 517 {
 518         // Correct rounding at <0
 519         v3f pf = read_v3f(L, index);
 520         return floatToInt(pf, 1.0);
 521 }
 522
 523 static v3s16 check_v3s16(lua_State *L, int index)
 524 {
 525         // Correct rounding at <0
 526         v3f pf = check_v3f(L, index);
 527         return floatToInt(pf, 1.0);
 528 }
 529
 530 static void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
 531 {
 532         lua_newtable(L);
 533         lua_pushstring(L, ndef->get(n).name.c_str());
 534         lua_setfield(L, -2, "name");
 535         lua_pushnumber(L, n.getParam1());
 536         lua_setfield(L, -2, "param1");
 537         lua_pushnumber(L, n.getParam2());
 538         lua_setfield(L, -2, "param2");
 539 }
 540
 541 static MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
 542 {
 543         lua_getfield(L, index, "name");
 544         const char *name = luaL_checkstring(L, -1);
 545         lua_pop(L, 1);
 546         u8 param1;
 547         lua_getfield(L, index, "param1");
 548         if(lua_isnil(L, -1))
 549                 param1 = 0;
 550         else
 551                 param1 = lua_tonumber(L, -1);
 552         lua_pop(L, 1);
 553         u8 param2;
 554         lua_getfield(L, index, "param2");
 555         if(lua_isnil(L, -1))
 556                 param2 = 0;
 557         else
 558                 param2 = lua_tonumber(L, -1);
 559         lua_pop(L, 1);
 560         return MapNode(ndef, name, param1, param2);
 561 }
 562
 563 static video::SColor readARGB8(lua_State *L, int index)
 564 {
 565         video::SColor color;
 566         luaL_checktype(L, index, LUA_TTABLE);
 567         lua_getfield(L, index, "a");
 568         if(lua_isnumber(L, -1))
 569                 color.setAlpha(lua_tonumber(L, -1));
 570         lua_pop(L, 1);
 571         lua_getfield(L, index, "r");
 572         color.setRed(lua_tonumber(L, -1));
 573         lua_pop(L, 1);
 574         lua_getfield(L, index, "g");
 575         color.setGreen(lua_tonumber(L, -1));
 576         lua_pop(L, 1);
 577         lua_getfield(L, index, "b");
 578         color.setBlue(lua_tonumber(L, -1));
 579         lua_pop(L, 1);
 580         return color;
 581 }
 582
 583 static core::aabbox3d<f32> read_aabbox3df32(lua_State *L, int index, f32 scale)
 584 {
 585         core::aabbox3d<f32> box;
 586         if(lua_istable(L, -1)){
 587                 lua_rawgeti(L, -1, 1);
 588                 box.MinEdge.X = lua_tonumber(L, -1) * scale;
 589                 lua_pop(L, 1);
 590                 lua_rawgeti(L, -1, 2);
 591                 box.MinEdge.Y = lua_tonumber(L, -1) * scale;
 592                 lua_pop(L, 1);
 593                 lua_rawgeti(L, -1, 3);
 594                 box.MinEdge.Z = lua_tonumber(L, -1) * scale;
 595                 lua_pop(L, 1);
 596                 lua_rawgeti(L, -1, 4);
 597                 box.MaxEdge.X = lua_tonumber(L, -1) * scale;
 598                 lua_pop(L, 1);
 599                 lua_rawgeti(L, -1, 5);
 600                 box.MaxEdge.Y = lua_tonumber(L, -1) * scale;
 601                 lua_pop(L, 1);
 602                 lua_rawgeti(L, -1, 6);
 603                 box.MaxEdge.Z = lua_tonumber(L, -1) * scale;
 604                 lua_pop(L, 1);
 605         }
 606         return box;
 607 }
 608
 609 #if 0
 610 /*
 611         MaterialProperties
 612 */
 613
 614 static MaterialProperties read_material_properties(
 615                 lua_State *L, int table)
 616 {
 617         MaterialProperties prop;
 618         prop.diggability = (Diggability)getenumfield(L, -1, "diggability",
 619                         es_Diggability, DIGGABLE_NORMAL);
 620         getfloatfield(L, -1, "constant_time", prop.constant_time);
 621         getfloatfield(L, -1, "weight", prop.weight);
 622         getfloatfield(L, -1, "crackiness", prop.crackiness);
 623         getfloatfield(L, -1, "crumbliness", prop.crumbliness);
 624         getfloatfield(L, -1, "cuttability", prop.cuttability);
 625         getfloatfield(L, -1, "flammability", prop.flammability);
 626         return prop;
 627 }
 628 #endif
 629
 630 /*
 631         Groups
 632 */
 633 static void read_groups(lua_State *L, int index,
 634                 std::map<std::string, int> &result)
 635 {
 636         result.clear();
 637         lua_pushnil(L);
 638         if(index < 0)
 639                 index -= 1;
 640         while(lua_next(L, index) != 0){
 641                 // key at index -2 and value at index -1
 642                 std::string name = luaL_checkstring(L, -2);
 643                 int rating = luaL_checkinteger(L, -1);
 644                 result[name] = rating;
 645                 // removes value, keeps key for next iteration
 646                 lua_pop(L, 1);
 647         }
 648 }
 649
 650 /*
 651         Privileges
 652 */
 653 static void read_privileges(lua_State *L, int index,
 654                 std::set<std::string> &result)
 655 {
 656         result.clear();
 657         lua_pushnil(L);
 658         if(index < 0)
 659                 index -= 1;
 660         while(lua_next(L, index) != 0){
 661                 // key at index -2 and value at index -1
 662                 std::string key = luaL_checkstring(L, -2);
 663                 bool value = lua_toboolean(L, -1);
 664                 if(value)
 665                         result.insert(key);
 666                 // removes value, keeps key for next iteration
 667                 lua_pop(L, 1);
 668         }
 669 }
 670
 671 /*
 672         ToolCapabilities
 673 */
 674
 675 static ToolCapabilities read_tool_capabilities(
 676                 lua_State *L, int table)
 677 {
 678         ToolCapabilities toolcap;
 679         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
 680         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
 681         lua_getfield(L, table, "groupcaps");
 682         if(lua_istable(L, -1)){
 683                 int table_groupcaps = lua_gettop(L);
 684                 lua_pushnil(L);
 685                 while(lua_next(L, table_groupcaps) != 0){
 686                         // key at index -2 and value at index -1
 687                         std::string groupname = luaL_checkstring(L, -2);
 688                         if(lua_istable(L, -1)){
 689                                 int table_groupcap = lua_gettop(L);
 690                                 // This will be created
 691                                 ToolGroupCap groupcap;
 692                                 // Read simple parameters
 693                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
 694                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
 695                                 // DEPRECATED: maxwear
 696                                 float maxwear = 0;
 697                                 if(getfloatfield(L, table_groupcap, "maxwear", maxwear)){
 698                                         if(maxwear != 0)
 699                                                 groupcap.uses = 1.0/maxwear;
 700                                         else
 701                                                 groupcap.uses = 0;
 702                                         infostream<<script_get_backtrace(L)<<std::endl;
 703                                         infostream<<"WARNING: field \"maxwear\" is deprecated; "
 704                                                         <<"should replace with uses=1/maxwear"<<std::endl;
 705                                 }
 706                                 // Read "times" table
 707                                 lua_getfield(L, table_groupcap, "times");
 708                                 if(lua_istable(L, -1)){
 709                                         int table_times = lua_gettop(L);
 710                                         lua_pushnil(L);
 711                                         while(lua_next(L, table_times) != 0){
 712                                                 // key at index -2 and value at index -1
 713                                                 int rating = luaL_checkinteger(L, -2);
 714                                                 float time = luaL_checknumber(L, -1);
 715                                                 groupcap.times[rating] = time;
 716                                                 // removes value, keeps key for next iteration
 717                                                 lua_pop(L, 1);
 718                                         }
 719                                 }
 720                                 lua_pop(L, 1);
 721                                 // Insert groupcap into toolcap
 722                                 toolcap.groupcaps[groupname] = groupcap;
 723                         }
 724                         // removes value, keeps key for next iteration
 725                         lua_pop(L, 1);
 726                 }
 727         }
 728         lua_pop(L, 1);
 729         return toolcap;
 730 }
 731
 732 static void set_tool_capabilities(lua_State *L, int table,
 733                 const ToolCapabilities &toolcap)
 734 {
 735         setfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
 736         setintfield(L, table, "max_drop_level", toolcap.max_drop_level);
 737         // Create groupcaps table
 738         lua_newtable(L);
 739         // For each groupcap
 740         for(std::map<std::string, ToolGroupCap>::const_iterator
 741                         i = toolcap.groupcaps.begin(); i != toolcap.groupcaps.end(); i++){
 742                 // Create groupcap table
 743                 lua_newtable(L);
 744                 const std::string &name = i->first;
 745                 const ToolGroupCap &groupcap = i->second;
 746                 // Create subtable "times"
 747                 lua_newtable(L);
 748                 for(std::map<int, float>::const_iterator
 749                                 i = groupcap.times.begin(); i != groupcap.times.end(); i++){
 750                         int rating = i->first;
 751                         float time = i->second;
 752                         lua_pushinteger(L, rating);
 753                         lua_pushnumber(L, time);
 754                         lua_settable(L, -3);
 755                 }
 756                 // Set subtable "times"
 757                 lua_setfield(L, -2, "times");
 758                 // Set simple parameters
 759                 setintfield(L, -1, "maxlevel", groupcap.maxlevel);
 760                 setintfield(L, -1, "uses", groupcap.uses);
 761                 // Insert groupcap table into groupcaps table
 762                 lua_setfield(L, -2, name.c_str());
 763         }
 764         // Set groupcaps table
 765         lua_setfield(L, -2, "groupcaps");
 766 }
 767
 768 static void push_tool_capabilities(lua_State *L,
 769                 const ToolCapabilities &prop)
 770 {
 771         lua_newtable(L);
 772         set_tool_capabilities(L, -1, prop);
 773 }
 774
 775 /*
 776         DigParams
 777 */
 778
 779 static void set_dig_params(lua_State *L, int table,
 780                 const DigParams &params)
 781 {
 782         setboolfield(L, table, "diggable", params.diggable);
 783         setfloatfield(L, table, "time", params.time);
 784         setintfield(L, table, "wear", params.wear);
 785 }
 786
 787 static void push_dig_params(lua_State *L,
 788                 const DigParams &params)
 789 {
 790         lua_newtable(L);
 791         set_dig_params(L, -1, params);
 792 }
 793
 794 /*
 795         HitParams
 796 */
 797
 798 static void set_hit_params(lua_State *L, int table,
 799                 const HitParams &params)
 800 {
 801         setintfield(L, table, "hp", params.hp);
 802         setintfield(L, table, "wear", params.wear);
 803 }
 804
 805 static void push_hit_params(lua_State *L,
 806                 const HitParams &params)
 807 {
 808         lua_newtable(L);
 809         set_hit_params(L, -1, params);
 810 }
 811
 812 /*
 813         PointedThing
 814 */
 815
 816 static void push_pointed_thing(lua_State *L, const PointedThing& pointed)
 817 {
 818         lua_newtable(L);
 819         if(pointed.type == POINTEDTHING_NODE)
 820         {
 821                 lua_pushstring(L, "node");
 822                 lua_setfield(L, -2, "type");
 823                 push_v3s16(L, pointed.node_undersurface);
 824                 lua_setfield(L, -2, "under");
 825                 push_v3s16(L, pointed.node_abovesurface);
 826                 lua_setfield(L, -2, "above");
 827         }
 828         else if(pointed.type == POINTEDTHING_OBJECT)
 829         {
 830                 lua_pushstring(L, "object");
 831                 lua_setfield(L, -2, "type");
 832                 objectref_get(L, pointed.object_id);
 833                 lua_setfield(L, -2, "ref");
 834         }
 835         else
 836         {
 837                 lua_pushstring(L, "nothing");
 838                 lua_setfield(L, -2, "type");
 839         }
 840 }
 841
 842 /*
 843         SimpleSoundSpec
 844 */
 845
 846 static void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
 847 {
 848         if(index < 0)
 849                 index = lua_gettop(L) + 1 + index;
 850         if(lua_isnil(L, index)){
 851         } else if(lua_istable(L, index)){
 852                 getstringfield(L, index, "name", spec.name);
 853                 getfloatfield(L, index, "gain", spec.gain);
 854         } else if(lua_isstring(L, index)){
 855                 spec.name = lua_tostring(L, index);
 856         }
 857 }
 858
 859 /*
 860         ObjectProperties
 861 */
 862
 863 static void read_object_properties(lua_State *L, int index,
 864                 ObjectProperties *prop)
 865 {
 866         if(index < 0)
 867                 index = lua_gettop(L) + 1 + index;
 868         if(!lua_istable(L, index))
 869                 return;
 870
 871         prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
 872
 873         getboolfield(L, -1, "physical", prop->physical);
 874
 875         getfloatfield(L, -1, "weight", prop->weight);
 876
 877         lua_getfield(L, -1, "collisionbox");
 878         if(lua_istable(L, -1))
 879                 prop->collisionbox = read_aabbox3df32(L, -1, 1.0);
 880         lua_pop(L, 1);
 881
 882         getstringfield(L, -1, "visual", prop->visual);
 883
 884         lua_getfield(L, -1, "visual_size");
 885         if(lua_istable(L, -1))
 886                 prop->visual_size = read_v2f(L, -1);
 887         lua_pop(L, 1);
 888
 889         lua_getfield(L, -1, "textures");
 890         if(lua_istable(L, -1)){
 891                 prop->textures.clear();
 892                 int table = lua_gettop(L);
 893                 lua_pushnil(L);
 894                 while(lua_next(L, table) != 0){
 895                         // key at index -2 and value at index -1
 896                         if(lua_isstring(L, -1))
 897                                 prop->textures.push_back(lua_tostring(L, -1));
 898                         else
 899                                 prop->textures.push_back("");
 900                         // removes value, keeps key for next iteration
 901                         lua_pop(L, 1);
 902                 }
 903         }
 904         lua_pop(L, 1);
 905
 906         lua_getfield(L, -1, "spritediv");
 907         if(lua_istable(L, -1))
 908                 prop->spritediv = read_v2s16(L, -1);
 909         lua_pop(L, 1);
 910
 911         lua_getfield(L, -1, "initial_sprite_basepos");
 912         if(lua_istable(L, -1))
 913                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 914         lua_pop(L, 1);
 915
 916         getboolfield(L, -1, "is_visible", prop->is_visible);
 917         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 918         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 919 }
 920
 921 /*
 922         ItemDefinition
 923 */
 924
 925 static ItemDefinition read_item_definition(lua_State *L, int index)
 926 {
 927         if(index < 0)
 928                 index = lua_gettop(L) + 1 + index;
 929
 930         // Read the item definition
 931         ItemDefinition def;
 932
 933         def.type = (ItemType)getenumfield(L, index, "type",
 934                         es_ItemType, ITEM_NONE);
 935         getstringfield(L, index, "name", def.name);
 936         getstringfield(L, index, "description", def.description);
 937         getstringfield(L, index, "inventory_image", def.inventory_image);
 938         getstringfield(L, index, "wield_image", def.wield_image);
 939
 940         lua_getfield(L, index, "wield_scale");
 941         if(lua_istable(L, -1)){
 942                 def.wield_scale = check_v3f(L, -1);
 943         }
 944         lua_pop(L, 1);
 945
 946         def.stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
 947         if(def.stack_max == 0)
 948                 def.stack_max = 1;
 949
 950         lua_getfield(L, index, "on_use");
 951         def.usable = lua_isfunction(L, -1);
 952         lua_pop(L, 1);
 953
 954         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
 955
 956         warn_if_field_exists(L, index, "tool_digging_properties",
 957                         "deprecated: use tool_capabilities");
 958
 959         lua_getfield(L, index, "tool_capabilities");
 960         if(lua_istable(L, -1)){
 961                 def.tool_capabilities = new ToolCapabilities(
 962                                 read_tool_capabilities(L, -1));
 963         }
 964
 965         // If name is "" (hand), ensure there are ToolCapabilities
 966         // because it will be looked up there whenever any other item has
 967         // no ToolCapabilities
 968         if(def.name == "" && def.tool_capabilities == NULL){
 969                 def.tool_capabilities = new ToolCapabilities();
 970         }
 971
 972         lua_getfield(L, index, "groups");
 973         read_groups(L, -1, def.groups);
 974         lua_pop(L, 1);
 975
 976         return def;
 977 }
 978
 979 /*
 980         ContentFeatures
 981 */
 982
 983 static ContentFeatures read_content_features(lua_State *L, int index)
 984 {
 985         if(index < 0)
 986                 index = lua_gettop(L) + 1 + index;
 987
 988         ContentFeatures f;
 989         /* Name */
 990         getstringfield(L, index, "name", f.name);
 991
 992         /* Groups */
 993         lua_getfield(L, index, "groups");
 994         read_groups(L, -1, f.groups);
 995         lua_pop(L, 1);
 996
 997         /* Visual definition */
 998
 999         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype", es_DrawType,
1000                         NDT_NORMAL);
1001         getfloatfield(L, index, "visual_scale", f.visual_scale);
1002
1003         lua_getfield(L, index, "tile_images");
1004         if(lua_istable(L, -1)){
1005                 int table = lua_gettop(L);
1006                 lua_pushnil(L);
1007                 int i = 0;
1008                 while(lua_next(L, table) != 0){
1009                         // key at index -2 and value at index -1
1010                         if(lua_isstring(L, -1))
1011                                 f.tname_tiles[i] = lua_tostring(L, -1);
1012                         else
1013                                 f.tname_tiles[i] = "";
1014                         // removes value, keeps key for next iteration
1015                         lua_pop(L, 1);
1016                         i++;
1017                         if(i==6){
1018                                 lua_pop(L, 1);
1019                                 break;
1020                         }
1021                 }
1022                 // Copy last value to all remaining textures
1023                 if(i >= 1){
1024                         std::string lastname = f.tname_tiles[i-1];
1025                         while(i < 6){
1026                                 f.tname_tiles[i] = lastname;
1027                                 i++;
1028                         }
1029                 }
1030         }
1031         lua_pop(L, 1);
1032
1033         lua_getfield(L, index, "special_materials");
1034         if(lua_istable(L, -1)){
1035                 int table = lua_gettop(L);
1036                 lua_pushnil(L);
1037                 int i = 0;
1038                 while(lua_next(L, table) != 0){
1039                         // key at index -2 and value at index -1
1040                         int smtable = lua_gettop(L);
1041                         std::string tname = getstringfield_default(
1042                                         L, smtable, "image", "");
1043                         bool backface_culling = getboolfield_default(
1044                                         L, smtable, "backface_culling", true);
1045                         MaterialSpec mspec(tname, backface_culling);
1046                         f.mspec_special[i] = mspec;
1047                         // removes value, keeps key for next iteration
1048                         lua_pop(L, 1);
1049                         i++;
1050                         if(i==6){
1051                                 lua_pop(L, 1);
1052                                 break;
1053                         }
1054                 }
1055         }
1056         lua_pop(L, 1);
1057
1058         f.alpha = getintfield_default(L, index, "alpha", 255);
1059
1060         /* Other stuff */
1061
1062         lua_getfield(L, index, "post_effect_color");
1063         if(!lua_isnil(L, -1))
1064                 f.post_effect_color = readARGB8(L, -1);
1065         lua_pop(L, 1);
1066
1067         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
1068                         es_ContentParamType, CPT_NONE);
1069         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
1070                         es_ContentParamType2, CPT2_NONE);
1071
1072         // Warn about some deprecated fields
1073         warn_if_field_exists(L, index, "wall_mounted",
1074                         "deprecated: use paramtype2 = 'wallmounted'");
1075         warn_if_field_exists(L, index, "light_propagates",
1076                         "deprecated: determined from paramtype");
1077         warn_if_field_exists(L, index, "dug_item",
1078                         "deprecated: use 'drop' field");
1079         warn_if_field_exists(L, index, "extra_dug_item",
1080                         "deprecated: use 'drop' field");
1081         warn_if_field_exists(L, index, "extra_dug_item_rarity",
1082                         "deprecated: use 'drop' field");
1083         warn_if_field_exists(L, index, "metadata_name",
1084                         "deprecated: use on_add and metadata callbacks");
1085
1086         // True for all ground-like things like stone and mud, false for eg. trees
1087         getboolfield(L, index, "is_ground_content", f.is_ground_content);
1088         f.light_propagates = (f.param_type == CPT_LIGHT);
1089         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
1090         // This is used for collision detection.
1091         // Also for general solidness queries.
1092         getboolfield(L, index, "walkable", f.walkable);
1093         // Player can point to these
1094         getboolfield(L, index, "pointable", f.pointable);
1095         // Player can dig these
1096         getboolfield(L, index, "diggable", f.diggable);
1097         // Player can climb these
1098         getboolfield(L, index, "climbable", f.climbable);
1099         // Player can build on these
1100         getboolfield(L, index, "buildable_to", f.buildable_to);
1101         // Whether the node is non-liquid, source liquid or flowing liquid
1102         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
1103                         es_LiquidType, LIQUID_NONE);
1104         // If the content is liquid, this is the flowing version of the liquid.
1105         getstringfield(L, index, "liquid_alternative_flowing",
1106                         f.liquid_alternative_flowing);
1107         // If the content is liquid, this is the source version of the liquid.
1108         getstringfield(L, index, "liquid_alternative_source",
1109                         f.liquid_alternative_source);
1110         // Viscosity for fluid flow, ranging from 1 to 7, with
1111         // 1 giving almost instantaneous propagation and 7 being
1112         // the slowest possible
1113         f.liquid_viscosity = getintfield_default(L, index,
1114                         "liquid_viscosity", f.liquid_viscosity);
1115         // Amount of light the node emits
1116         f.light_source = getintfield_default(L, index,
1117                         "light_source", f.light_source);
1118         f.damage_per_second = getintfield_default(L, index,
1119                         "damage_per_second", f.damage_per_second);
1120
1121         lua_getfield(L, index, "selection_box");
1122         if(lua_istable(L, -1)){
1123                 f.selection_box.type = (NodeBoxType)getenumfield(L, -1, "type",
1124                                 es_NodeBoxType, NODEBOX_REGULAR);
1125
1126                 lua_getfield(L, -1, "fixed");
1127                 if(lua_istable(L, -1))
1128                         f.selection_box.fixed = read_aabbox3df32(L, -1, BS);
1129                 lua_pop(L, 1);
1130
1131                 lua_getfield(L, -1, "wall_top");
1132                 if(lua_istable(L, -1))
1133                         f.selection_box.wall_top = read_aabbox3df32(L, -1, BS);
1134                 lua_pop(L, 1);
1135
1136                 lua_getfield(L, -1, "wall_bottom");
1137                 if(lua_istable(L, -1))
1138                         f.selection_box.wall_bottom = read_aabbox3df32(L, -1, BS);
1139                 lua_pop(L, 1);
1140
1141                 lua_getfield(L, -1, "wall_side");
1142                 if(lua_istable(L, -1))
1143                         f.selection_box.wall_side = read_aabbox3df32(L, -1, BS);
1144                 lua_pop(L, 1);
1145         }
1146         lua_pop(L, 1);
1147
1148         // Set to true if paramtype used to be 'facedir_simple'
1149         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
1150         // Set to true if wall_mounted used to be set to true
1151         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
1152
1153         // Sound table
1154         lua_getfield(L, index, "sounds");
1155         if(lua_istable(L, -1)){
1156                 lua_getfield(L, -1, "footstep");
1157                 read_soundspec(L, -1, f.sound_footstep);
1158                 lua_pop(L, 1);
1159                 lua_getfield(L, -1, "dig");
1160                 read_soundspec(L, -1, f.sound_dig);
1161                 lua_pop(L, 1);
1162                 lua_getfield(L, -1, "dug");
1163                 read_soundspec(L, -1, f.sound_dug);
1164                 lua_pop(L, 1);
1165         }
1166         lua_pop(L, 1);
1167
1168         return f;
1169 }
1170
1171 /*
1172         Inventory stuff
1173 */
1174
1175 static ItemStack read_item(lua_State *L, int index);
1176
1177 static void inventory_set_list_from_lua(Inventory *inv, const char *name,
1178                 lua_State *L, int tableindex, int forcesize=-1)
1179 {
1180         if(tableindex < 0)
1181                 tableindex = lua_gettop(L) + 1 + tableindex;
1182         // If nil, delete list
1183         if(lua_isnil(L, tableindex)){
1184                 inv->deleteList(name);
1185                 return;
1186         }
1187         // Otherwise set list
1188         std::vector<ItemStack> items;
1189         luaL_checktype(L, tableindex, LUA_TTABLE);
1190         lua_pushnil(L);
1191         while(lua_next(L, tableindex) != 0){
1192                 // key at index -2 and value at index -1
1193                 items.push_back(read_item(L, -1));
1194                 // removes value, keeps key for next iteration
1195                 lua_pop(L, 1);
1196         }
1197         int listsize = (forcesize != -1) ? forcesize : items.size();
1198         InventoryList *invlist = inv->addList(name, listsize);
1199         int index = 0;
1200         for(std::vector<ItemStack>::const_iterator
1201                         i = items.begin(); i != items.end(); i++){
1202                 if(forcesize != -1 && index == forcesize)
1203                         break;
1204                 invlist->changeItem(index, *i);
1205                 index++;
1206         }
1207         while(forcesize != -1 && index < forcesize){
1208                 invlist->deleteItem(index);
1209                 index++;
1210         }
1211 }
1212
1213 static void inventory_get_list_to_lua(Inventory *inv, const char *name,
1214                 lua_State *L)
1215 {
1216         InventoryList *invlist = inv->getList(name);
1217         if(invlist == NULL){
1218                 lua_pushnil(L);
1219                 return;
1220         }
1221         // Get the table insert function
1222         lua_getglobal(L, "table");
1223         lua_getfield(L, -1, "insert");
1224         int table_insert = lua_gettop(L);
1225         // Create and fill table
1226         lua_newtable(L);
1227         int table = lua_gettop(L);
1228         for(u32 i=0; i<invlist->getSize(); i++){
1229                 ItemStack item = invlist->getItem(i);
1230                 lua_pushvalue(L, table_insert);
1231                 lua_pushvalue(L, table);
1232                 lua_pushstring(L, item.getItemString().c_str());
1233                 if(lua_pcall(L, 2, 0, 0))
1234                         script_error(L, "error: %s", lua_tostring(L, -1));
1235         }
1236 }
1237
1238 /*
1239         Helpful macros for userdata classes
1240 */
1241
1242 #define method(class, name) {#name, class::l_##name}
1243
1244 /*
1245         LuaItemStack
1246 */
1247
1248 class LuaItemStack
1249 {
1250 private:
1251         ItemStack m_stack;
1252
1253         static const char className[];
1254         static const luaL_reg methods[];
1255
1256         // Exported functions
1257
1258         // garbage collector
1259         static int gc_object(lua_State *L)
1260         {
1261                 LuaItemStack *o = *(LuaItemStack **)(lua_touserdata(L, 1));
1262                 delete o;
1263                 return 0;
1264         }
1265
1266         // is_empty(self) -> true/false
1267         static int l_is_empty(lua_State *L)
1268         {
1269                 LuaItemStack *o = checkobject(L, 1);
1270                 ItemStack &item = o->m_stack;
1271                 lua_pushboolean(L, item.empty());
1272                 return 1;
1273         }
1274
1275         // get_name(self) -> string
1276         static int l_get_name(lua_State *L)
1277         {
1278                 LuaItemStack *o = checkobject(L, 1);
1279                 ItemStack &item = o->m_stack;
1280                 lua_pushstring(L, item.name.c_str());
1281                 return 1;
1282         }
1283
1284         // get_count(self) -> number
1285         static int l_get_count(lua_State *L)
1286         {
1287                 LuaItemStack *o = checkobject(L, 1);
1288                 ItemStack &item = o->m_stack;
1289                 lua_pushinteger(L, item.count);
1290                 return 1;
1291         }
1292
1293         // get_wear(self) -> number
1294         static int l_get_wear(lua_State *L)
1295         {
1296                 LuaItemStack *o = checkobject(L, 1);
1297                 ItemStack &item = o->m_stack;
1298                 lua_pushinteger(L, item.wear);
1299                 return 1;
1300         }
1301
1302         // get_metadata(self) -> string
1303         static int l_get_metadata(lua_State *L)
1304         {
1305                 LuaItemStack *o = checkobject(L, 1);
1306                 ItemStack &item = o->m_stack;
1307                 lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
1308                 return 1;
1309         }
1310
1311         // clear(self) -> true
1312         static int l_clear(lua_State *L)
1313         {
1314                 LuaItemStack *o = checkobject(L, 1);
1315                 o->m_stack.clear();
1316                 lua_pushboolean(L, true);
1317                 return 1;
1318         }
1319
1320         // replace(self, itemstack or itemstring or table or nil) -> true
1321         static int l_replace(lua_State *L)
1322         {
1323                 LuaItemStack *o = checkobject(L, 1);
1324                 o->m_stack = read_item(L, 2);
1325                 lua_pushboolean(L, true);
1326                 return 1;
1327         }
1328
1329         // to_string(self) -> string
1330         static int l_to_string(lua_State *L)
1331         {
1332                 LuaItemStack *o = checkobject(L, 1);
1333                 std::string itemstring = o->m_stack.getItemString();
1334                 lua_pushstring(L, itemstring.c_str());
1335                 return 1;
1336         }
1337
1338         // to_table(self) -> table or nil
1339         static int l_to_table(lua_State *L)
1340         {
1341                 LuaItemStack *o = checkobject(L, 1);
1342                 const ItemStack &item = o->m_stack;
1343                 if(item.empty())
1344                 {
1345                         lua_pushnil(L);
1346                 }
1347                 else
1348                 {
1349                         lua_newtable(L);
1350                         lua_pushstring(L, item.name.c_str());
1351                         lua_setfield(L, -2, "name");
1352                         lua_pushinteger(L, item.count);
1353                         lua_setfield(L, -2, "count");
1354                         lua_pushinteger(L, item.wear);
1355                         lua_setfield(L, -2, "wear");
1356                         lua_pushlstring(L, item.metadata.c_str(), item.metadata.size());
1357                         lua_setfield(L, -2, "metadata");
1358                 }
1359                 return 1;
1360         }
1361
1362         // get_stack_max(self) -> number
1363         static int l_get_stack_max(lua_State *L)
1364         {
1365                 LuaItemStack *o = checkobject(L, 1);
1366                 ItemStack &item = o->m_stack;
1367                 lua_pushinteger(L, item.getStackMax(get_server(L)->idef()));
1368                 return 1;
1369         }
1370
1371         // get_free_space(self) -> number
1372         static int l_get_free_space(lua_State *L)
1373         {
1374                 LuaItemStack *o = checkobject(L, 1);
1375                 ItemStack &item = o->m_stack;
1376                 lua_pushinteger(L, item.freeSpace(get_server(L)->idef()));
1377                 return 1;
1378         }
1379
1380         // is_known(self) -> true/false
1381         // Checks if the item is defined.
1382         static int l_is_known(lua_State *L)
1383         {
1384                 LuaItemStack *o = checkobject(L, 1);
1385                 ItemStack &item = o->m_stack;
1386                 bool is_known = item.isKnown(get_server(L)->idef());
1387                 lua_pushboolean(L, is_known);
1388                 return 1;
1389         }
1390
1391         // get_definition(self) -> table
1392         // Returns the item definition table from minetest.registered_items,
1393         // or a fallback one (name="unknown")
1394         static int l_get_definition(lua_State *L)
1395         {
1396                 LuaItemStack *o = checkobject(L, 1);
1397                 ItemStack &item = o->m_stack;
1398
1399                 // Get minetest.registered_items[name]
1400                 lua_getglobal(L, "minetest");
1401                 lua_getfield(L, -1, "registered_items");
1402                 luaL_checktype(L, -1, LUA_TTABLE);
1403                 lua_getfield(L, -1, item.name.c_str());
1404                 if(lua_isnil(L, -1))
1405                 {
1406                         lua_pop(L, 1);
1407                         lua_getfield(L, -1, "unknown");
1408                 }
1409                 return 1;
1410         }
1411
1412         // get_tool_capabilities(self) -> table
1413         // Returns the effective tool digging properties.
1414         // Returns those of the hand ("") if this item has none associated.
1415         static int l_get_tool_capabilities(lua_State *L)
1416         {
1417                 LuaItemStack *o = checkobject(L, 1);
1418                 ItemStack &item = o->m_stack;
1419                 const ToolCapabilities &prop =
1420                         item.getToolCapabilities(get_server(L)->idef());
1421                 push_tool_capabilities(L, prop);
1422                 return 1;
1423         }
1424
1425         // add_wear(self, amount) -> true/false
1426         // The range for "amount" is [0,65535]. Wear is only added if the item
1427         // is a tool. Adding wear might destroy the item.
1428         // Returns true if the item is (or was) a tool.
1429         static int l_add_wear(lua_State *L)
1430         {
1431                 LuaItemStack *o = checkobject(L, 1);
1432                 ItemStack &item = o->m_stack;
1433                 int amount = lua_tointeger(L, 2);
1434                 bool result = item.addWear(amount, get_server(L)->idef());
1435                 lua_pushboolean(L, result);
1436                 return 1;
1437         }
1438
1439         // add_item(self, itemstack or itemstring or table or nil) -> itemstack
1440         // Returns leftover item stack
1441         static int l_add_item(lua_State *L)
1442         {
1443                 LuaItemStack *o = checkobject(L, 1);
1444                 ItemStack &item = o->m_stack;
1445                 ItemStack newitem = read_item(L, 2);
1446                 ItemStack leftover = item.addItem(newitem, get_server(L)->idef());
1447                 create(L, leftover);
1448                 return 1;
1449         }
1450
1451         // item_fits(self, itemstack or itemstring or table or nil) -> true/false, itemstack
1452         // First return value is true iff the new item fits fully into the stack
1453         // Second return value is the would-be-left-over item stack
1454         static int l_item_fits(lua_State *L)
1455         {
1456                 LuaItemStack *o = checkobject(L, 1);
1457                 ItemStack &item = o->m_stack;
1458                 ItemStack newitem = read_item(L, 2);
1459                 ItemStack restitem;
1460                 bool fits = item.itemFits(newitem, &restitem, get_server(L)->idef());
1461                 lua_pushboolean(L, fits);  // first return value
1462                 create(L, restitem);       // second return value
1463                 return 2;
1464         }
1465
1466         // take_item(self, takecount=1) -> itemstack
1467         static int l_take_item(lua_State *L)
1468         {
1469                 LuaItemStack *o = checkobject(L, 1);
1470                 ItemStack &item = o->m_stack;
1471                 u32 takecount = 1;
1472                 if(!lua_isnone(L, 2))
1473                         takecount = lua_tointeger(L, 2);
1474                 ItemStack taken = item.takeItem(takecount);
1475                 create(L, taken);
1476                 return 1;
1477         }
1478
1479         // peek_item(self, peekcount=1) -> itemstack
1480         static int l_peek_item(lua_State *L)
1481         {
1482                 LuaItemStack *o = checkobject(L, 1);
1483                 ItemStack &item = o->m_stack;
1484                 u32 peekcount = 1;
1485                 if(!lua_isnone(L, 2))
1486                         peekcount = lua_tointeger(L, 2);
1487                 ItemStack peekaboo = item.peekItem(peekcount);
1488                 create(L, peekaboo);
1489                 return 1;
1490         }
1491
1492 public:
1493         LuaItemStack(const ItemStack &item):
1494                 m_stack(item)
1495         {
1496         }
1497
1498         ~LuaItemStack()
1499         {
1500         }
1501
1502         const ItemStack& getItem() const
1503         {
1504                 return m_stack;
1505         }
1506         ItemStack& getItem()
1507         {
1508                 return m_stack;
1509         }
1510
1511         // LuaItemStack(itemstack or itemstring or table or nil)
1512         // Creates an LuaItemStack and leaves it on top of stack
1513         static int create_object(lua_State *L)
1514         {
1515                 ItemStack item = read_item(L, 1);
1516                 LuaItemStack *o = new LuaItemStack(item);
1517                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1518                 luaL_getmetatable(L, className);
1519                 lua_setmetatable(L, -2);
1520                 return 1;
1521         }
1522         // Not callable from Lua
1523         static int create(lua_State *L, const ItemStack &item)
1524         {
1525                 LuaItemStack *o = new LuaItemStack(item);
1526                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1527                 luaL_getmetatable(L, className);
1528                 lua_setmetatable(L, -2);
1529                 return 1;
1530         }
1531
1532         static LuaItemStack* checkobject(lua_State *L, int narg)
1533         {
1534                 luaL_checktype(L, narg, LUA_TUSERDATA);
1535                 void *ud = luaL_checkudata(L, narg, className);
1536                 if(!ud) luaL_typerror(L, narg, className);
1537                 return *(LuaItemStack**)ud;  // unbox pointer
1538         }
1539
1540         static void Register(lua_State *L)
1541         {
1542                 lua_newtable(L);
1543                 int methodtable = lua_gettop(L);
1544                 luaL_newmetatable(L, className);
1545                 int metatable = lua_gettop(L);
1546
1547                 lua_pushliteral(L, "__metatable");
1548                 lua_pushvalue(L, methodtable);
1549                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
1550
1551                 lua_pushliteral(L, "__index");
1552                 lua_pushvalue(L, methodtable);
1553                 lua_settable(L, metatable);
1554
1555                 lua_pushliteral(L, "__gc");
1556                 lua_pushcfunction(L, gc_object);
1557                 lua_settable(L, metatable);
1558
1559                 lua_pop(L, 1);  // drop metatable
1560
1561                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
1562                 lua_pop(L, 1);  // drop methodtable
1563
1564                 // Can be created from Lua (LuaItemStack(itemstack or itemstring or table or nil))
1565                 lua_register(L, className, create_object);
1566         }
1567 };
1568 const char LuaItemStack::className[] = "ItemStack";
1569 const luaL_reg LuaItemStack::methods[] = {
1570         method(LuaItemStack, is_empty),
1571         method(LuaItemStack, get_name),
1572         method(LuaItemStack, get_count),
1573         method(LuaItemStack, get_wear),
1574         method(LuaItemStack, get_metadata),
1575         method(LuaItemStack, clear),
1576         method(LuaItemStack, replace),
1577         method(LuaItemStack, to_string),
1578         method(LuaItemStack, to_table),
1579         method(LuaItemStack, get_stack_max),
1580         method(LuaItemStack, get_free_space),
1581         method(LuaItemStack, is_known),
1582         method(LuaItemStack, get_definition),
1583         method(LuaItemStack, get_tool_capabilities),
1584         method(LuaItemStack, add_wear),
1585         method(LuaItemStack, add_item),
1586         method(LuaItemStack, item_fits),
1587         method(LuaItemStack, take_item),
1588         method(LuaItemStack, peek_item),
1589         {0,0}
1590 };
1591
1592 static ItemStack read_item(lua_State *L, int index)
1593 {
1594         if(index < 0)
1595                 index = lua_gettop(L) + 1 + index;
1596
1597         if(lua_isnil(L, index))
1598         {
1599                 return ItemStack();
1600         }
1601         else if(lua_isuserdata(L, index))
1602         {
1603                 // Convert from LuaItemStack
1604                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
1605                 return o->getItem();
1606         }
1607         else if(lua_isstring(L, index))
1608         {
1609                 // Convert from itemstring
1610                 std::string itemstring = lua_tostring(L, index);
1611                 IItemDefManager *idef = get_server(L)->idef();
1612                 try
1613                 {
1614                         ItemStack item;
1615                         item.deSerialize(itemstring, idef);
1616                         return item;
1617                 }
1618                 catch(SerializationError &e)
1619                 {
1620                         infostream<<"WARNING: unable to create item from itemstring"
1621                                         <<": "<<itemstring<<std::endl;
1622                         return ItemStack();
1623                 }
1624         }
1625         else if(lua_istable(L, index))
1626         {
1627                 // Convert from table
1628                 IItemDefManager *idef = get_server(L)->idef();
1629                 std::string name = getstringfield_default(L, index, "name", "");
1630                 int count = getintfield_default(L, index, "count", 1);
1631                 int wear = getintfield_default(L, index, "wear", 0);
1632                 std::string metadata = getstringfield_default(L, index, "metadata", "");
1633                 return ItemStack(name, count, wear, metadata, idef);
1634         }
1635         else
1636         {
1637                 throw LuaError(L, "Expecting itemstack, itemstring, table or nil");
1638         }
1639 }
1640
1641 /*
1642         InvRef
1643 */
1644
1645 class InvRef
1646 {
1647 private:
1648         InventoryLocation m_loc;
1649
1650         static const char className[];
1651         static const luaL_reg methods[];
1652
1653         static InvRef *checkobject(lua_State *L, int narg)
1654         {
1655                 luaL_checktype(L, narg, LUA_TUSERDATA);
1656                 void *ud = luaL_checkudata(L, narg, className);
1657                 if(!ud) luaL_typerror(L, narg, className);
1658                 return *(InvRef**)ud;  // unbox pointer
1659         }
1660
1661         static Inventory* getinv(lua_State *L, InvRef *ref)
1662         {
1663                 return get_server(L)->getInventory(ref->m_loc);
1664         }
1665
1666         static InventoryList* getlist(lua_State *L, InvRef *ref,
1667                         const char *listname)
1668         {
1669                 Inventory *inv = getinv(L, ref);
1670                 if(!inv)
1671                         return NULL;
1672                 return inv->getList(listname);
1673         }
1674
1675         static void reportInventoryChange(lua_State *L, InvRef *ref)
1676         {
1677                 // Inform other things that the inventory has changed
1678                 get_server(L)->setInventoryModified(ref->m_loc);
1679         }
1680
1681         // Exported functions
1682
1683         // garbage collector
1684         static int gc_object(lua_State *L) {
1685                 InvRef *o = *(InvRef **)(lua_touserdata(L, 1));
1686                 delete o;
1687                 return 0;
1688         }
1689
1690         // get_size(self, listname)
1691         static int l_get_size(lua_State *L)
1692         {
1693                 InvRef *ref = checkobject(L, 1);
1694                 const char *listname = luaL_checkstring(L, 2);
1695                 InventoryList *list = getlist(L, ref, listname);
1696                 if(list){
1697                         lua_pushinteger(L, list->getSize());
1698                 } else {
1699                         lua_pushinteger(L, 0);
1700                 }
1701                 return 1;
1702         }
1703
1704         // set_size(self, listname, size)
1705         static int l_set_size(lua_State *L)
1706         {
1707                 InvRef *ref = checkobject(L, 1);
1708                 const char *listname = luaL_checkstring(L, 2);
1709                 int newsize = luaL_checknumber(L, 3);
1710                 Inventory *inv = getinv(L, ref);
1711                 if(newsize == 0){
1712                         inv->deleteList(listname);
1713                         reportInventoryChange(L, ref);
1714                         return 0;
1715                 }
1716                 InventoryList *list = inv->getList(listname);
1717                 if(list){
1718                         list->setSize(newsize);
1719                 } else {
1720                         list = inv->addList(listname, newsize);
1721                 }
1722                 reportInventoryChange(L, ref);
1723                 return 0;
1724         }
1725
1726         // get_stack(self, listname, i) -> itemstack
1727         static int l_get_stack(lua_State *L)
1728         {
1729                 InvRef *ref = checkobject(L, 1);
1730                 const char *listname = luaL_checkstring(L, 2);
1731                 int i = luaL_checknumber(L, 3) - 1;
1732                 InventoryList *list = getlist(L, ref, listname);
1733                 ItemStack item;
1734                 if(list != NULL && i >= 0 && i < (int) list->getSize())
1735                         item = list->getItem(i);
1736                 LuaItemStack::create(L, item);
1737                 return 1;
1738         }
1739
1740         // set_stack(self, listname, i, stack) -> true/false
1741         static int l_set_stack(lua_State *L)
1742         {
1743                 InvRef *ref = checkobject(L, 1);
1744                 const char *listname = luaL_checkstring(L, 2);
1745                 int i = luaL_checknumber(L, 3) - 1;
1746                 ItemStack newitem = read_item(L, 4);
1747                 InventoryList *list = getlist(L, ref, listname);
1748                 if(list != NULL && i >= 0 && i < (int) list->getSize()){
1749                         list->changeItem(i, newitem);
1750                         reportInventoryChange(L, ref);
1751                         lua_pushboolean(L, true);
1752                 } else {
1753                         lua_pushboolean(L, false);
1754                 }
1755                 return 1;
1756         }
1757
1758         // get_list(self, listname) -> list or nil
1759         static int l_get_list(lua_State *L)
1760         {
1761                 InvRef *ref = checkobject(L, 1);
1762                 const char *listname = luaL_checkstring(L, 2);
1763                 Inventory *inv = getinv(L, ref);
1764                 inventory_get_list_to_lua(inv, listname, L);
1765                 return 1;
1766         }
1767
1768         // set_list(self, listname, list)
1769         static int l_set_list(lua_State *L)
1770         {
1771                 InvRef *ref = checkobject(L, 1);
1772                 const char *listname = luaL_checkstring(L, 2);
1773                 Inventory *inv = getinv(L, ref);
1774                 InventoryList *list = inv->getList(listname);
1775                 if(list)
1776                         inventory_set_list_from_lua(inv, listname, L, 3,
1777                                         list->getSize());
1778                 else
1779                         inventory_set_list_from_lua(inv, listname, L, 3);
1780                 reportInventoryChange(L, ref);
1781                 return 0;
1782         }
1783
1784         // add_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
1785         // Returns the leftover stack
1786         static int l_add_item(lua_State *L)
1787         {
1788                 InvRef *ref = checkobject(L, 1);
1789                 const char *listname = luaL_checkstring(L, 2);
1790                 ItemStack item = read_item(L, 3);
1791                 InventoryList *list = getlist(L, ref, listname);
1792                 if(list){
1793                         ItemStack leftover = list->addItem(item);
1794                         if(leftover.count != item.count)
1795                                 reportInventoryChange(L, ref);
1796                         LuaItemStack::create(L, leftover);
1797                 } else {
1798                         LuaItemStack::create(L, item);
1799                 }
1800                 return 1;
1801         }
1802
1803         // room_for_item(self, listname, itemstack or itemstring or table or nil) -> true/false
1804         // Returns true if the item completely fits into the list
1805         static int l_room_for_item(lua_State *L)
1806         {
1807                 InvRef *ref = checkobject(L, 1);
1808                 const char *listname = luaL_checkstring(L, 2);
1809                 ItemStack item = read_item(L, 3);
1810                 InventoryList *list = getlist(L, ref, listname);
1811                 if(list){
1812                         lua_pushboolean(L, list->roomForItem(item));
1813                 } else {
1814                         lua_pushboolean(L, false);
1815                 }
1816                 return 1;
1817         }
1818
1819         // contains_item(self, listname, itemstack or itemstring or table or nil) -> true/false
1820         // Returns true if the list contains the given count of the given item name
1821         static int l_contains_item(lua_State *L)
1822         {
1823                 InvRef *ref = checkobject(L, 1);
1824                 const char *listname = luaL_checkstring(L, 2);
1825                 ItemStack item = read_item(L, 3);
1826                 InventoryList *list = getlist(L, ref, listname);
1827                 if(list){
1828                         lua_pushboolean(L, list->containsItem(item));
1829                 } else {
1830                         lua_pushboolean(L, false);
1831                 }
1832                 return 1;
1833         }
1834
1835         // remove_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
1836         // Returns the items that were actually removed
1837         static int l_remove_item(lua_State *L)
1838         {
1839                 InvRef *ref = checkobject(L, 1);
1840                 const char *listname = luaL_checkstring(L, 2);
1841                 ItemStack item = read_item(L, 3);
1842                 InventoryList *list = getlist(L, ref, listname);
1843                 if(list){
1844                         ItemStack removed = list->removeItem(item);
1845                         if(!removed.empty())
1846                                 reportInventoryChange(L, ref);
1847                         LuaItemStack::create(L, removed);
1848                 } else {
1849                         LuaItemStack::create(L, ItemStack());
1850                 }
1851                 return 1;
1852         }
1853
1854 public:
1855         InvRef(const InventoryLocation &loc):
1856                 m_loc(loc)
1857         {
1858         }
1859
1860         ~InvRef()
1861         {
1862         }
1863
1864         // Creates an InvRef and leaves it on top of stack
1865         // Not callable from Lua; all references are created on the C side.
1866         static void create(lua_State *L, const InventoryLocation &loc)
1867         {
1868                 InvRef *o = new InvRef(loc);
1869                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
1870                 luaL_getmetatable(L, className);
1871                 lua_setmetatable(L, -2);
1872         }
1873         static void createPlayer(lua_State *L, Player *player)
1874         {
1875                 InventoryLocation loc;
1876                 loc.setPlayer(player->getName());
1877                 create(L, loc);
1878         }
1879         static void createNodeMeta(lua_State *L, v3s16 p)
1880         {
1881                 InventoryLocation loc;
1882                 loc.setNodeMeta(p);
1883                 create(L, loc);
1884         }
1885
1886         static void Register(lua_State *L)
1887         {
1888                 lua_newtable(L);
1889                 int methodtable = lua_gettop(L);
1890                 luaL_newmetatable(L, className);
1891                 int metatable = lua_gettop(L);
1892
1893                 lua_pushliteral(L, "__metatable");
1894                 lua_pushvalue(L, methodtable);
1895                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
1896
1897                 lua_pushliteral(L, "__index");
1898                 lua_pushvalue(L, methodtable);
1899                 lua_settable(L, metatable);
1900
1901                 lua_pushliteral(L, "__gc");
1902                 lua_pushcfunction(L, gc_object);
1903                 lua_settable(L, metatable);
1904
1905                 lua_pop(L, 1);  // drop metatable
1906
1907                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
1908                 lua_pop(L, 1);  // drop methodtable
1909
1910                 // Cannot be created from Lua
1911                 //lua_register(L, className, create_object);
1912         }
1913 };
1914 const char InvRef::className[] = "InvRef";
1915 const luaL_reg InvRef::methods[] = {
1916         method(InvRef, get_size),
1917         method(InvRef, set_size),
1918         method(InvRef, get_stack),
1919         method(InvRef, set_stack),
1920         method(InvRef, get_list),
1921         method(InvRef, set_list),
1922         method(InvRef, add_item),
1923         method(InvRef, room_for_item),
1924         method(InvRef, contains_item),
1925         method(InvRef, remove_item),
1926         {0,0}
1927 };
1928
1929 /*
1930         NodeMetaRef
1931 */
1932
1933 class NodeMetaRef
1934 {
1935 private:
1936         v3s16 m_p;
1937         ServerEnvironment *m_env;
1938
1939         static const char className[];
1940         static const luaL_reg methods[];
1941
1942         static NodeMetaRef *checkobject(lua_State *L, int narg)
1943         {
1944                 luaL_checktype(L, narg, LUA_TUSERDATA);
1945                 void *ud = luaL_checkudata(L, narg, className);
1946                 if(!ud) luaL_typerror(L, narg, className);
1947                 return *(NodeMetaRef**)ud;  // unbox pointer
1948         }
1949
1950         static NodeMetadata* getmeta(NodeMetaRef *ref, bool auto_create)
1951         {
1952                 NodeMetadata *meta = ref->m_env->getMap().getNodeMetadata(ref->m_p);
1953                 if(meta == NULL && auto_create)
1954                 {
1955                         meta = new NodeMetadata(ref->m_env->getGameDef());
1956                         ref->m_env->getMap().setNodeMetadata(ref->m_p, meta);
1957                 }
1958                 return meta;
1959         }
1960
1961         static void reportMetadataChange(NodeMetaRef *ref)
1962         {
1963                 // Inform other things that the metadata has changed
1964                 v3s16 blockpos = getNodeBlockPos(ref->m_p);
1965                 MapEditEvent event;
1966                 event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
1967                 event.p = blockpos;
1968                 ref->m_env->getMap().dispatchEvent(&event);
1969                 // Set the block to be saved
1970                 MapBlock *block = ref->m_env->getMap().getBlockNoCreateNoEx(blockpos);
1971                 if(block)
1972                         block->raiseModified(MOD_STATE_WRITE_NEEDED,
1973                                         "NodeMetaRef::reportMetadataChange");
1974         }
1975
1976         // Exported functions
1977
1978         // garbage collector
1979         static int gc_object(lua_State *L) {
1980                 NodeMetaRef *o = *(NodeMetaRef **)(lua_touserdata(L, 1));
1981                 delete o;
1982                 return 0;
1983         }
1984
1985         // get_string(self, name)
1986         static int l_get_string(lua_State *L)
1987         {
1988                 NodeMetaRef *ref = checkobject(L, 1);
1989                 std::string name = luaL_checkstring(L, 2);
1990
1991                 NodeMetadata *meta = getmeta(ref, false);
1992                 if(meta == NULL){
1993                         lua_pushlstring(L, "", 0);
1994                         return 1;
1995                 }
1996                 std::string str = meta->getString(name);
1997                 lua_pushlstring(L, str.c_str(), str.size());
1998                 return 1;
1999         }
2000
2001         // set_string(self, name, var)
2002         static int l_set_string(lua_State *L)
2003         {
2004                 NodeMetaRef *ref = checkobject(L, 1);
2005                 std::string name = luaL_checkstring(L, 2);
2006                 size_t len = 0;
2007                 const char *s = lua_tolstring(L, 3, &len);
2008                 std::string str(s, len);
2009
2010                 NodeMetadata *meta = getmeta(ref, !str.empty());
2011                 if(meta == NULL || str == meta->getString(name))
2012                         return 0;
2013                 meta->setString(name, str);
2014                 reportMetadataChange(ref);
2015                 return 0;
2016         }
2017
2018         // get_int(self, name)
2019         static int l_get_int(lua_State *L)
2020         {
2021                 NodeMetaRef *ref = checkobject(L, 1);
2022                 std::string name = lua_tostring(L, 2);
2023
2024                 NodeMetadata *meta = getmeta(ref, false);
2025                 if(meta == NULL){
2026                         lua_pushnumber(L, 0);
2027                         return 1;
2028                 }
2029                 std::string str = meta->getString(name);
2030                 lua_pushnumber(L, stoi(str));
2031                 return 1;
2032         }
2033
2034         // set_int(self, name, var)
2035         static int l_set_int(lua_State *L)
2036         {
2037                 NodeMetaRef *ref = checkobject(L, 1);
2038                 std::string name = lua_tostring(L, 2);
2039                 int a = lua_tointeger(L, 3);
2040                 std::string str = itos(a);
2041
2042                 NodeMetadata *meta = getmeta(ref, true);
2043                 if(meta == NULL || str == meta->getString(name))
2044                         return 0;
2045                 meta->setString(name, str);
2046                 reportMetadataChange(ref);
2047                 return 0;
2048         }
2049
2050         // get_float(self, name)
2051         static int l_get_float(lua_State *L)
2052         {
2053                 NodeMetaRef *ref = checkobject(L, 1);
2054                 std::string name = lua_tostring(L, 2);
2055
2056                 NodeMetadata *meta = getmeta(ref, false);
2057                 if(meta == NULL){
2058                         lua_pushnumber(L, 0);
2059                         return 1;
2060                 }
2061                 std::string str = meta->getString(name);
2062                 lua_pushnumber(L, stof(str));
2063                 return 1;
2064         }
2065
2066         // set_float(self, name, var)
2067         static int l_set_float(lua_State *L)
2068         {
2069                 NodeMetaRef *ref = checkobject(L, 1);
2070                 std::string name = lua_tostring(L, 2);
2071                 float a = lua_tonumber(L, 3);
2072                 std::string str = ftos(a);
2073
2074                 NodeMetadata *meta = getmeta(ref, true);
2075                 if(meta == NULL || str == meta->getString(name))
2076                         return 0;
2077                 meta->setString(name, str);
2078                 reportMetadataChange(ref);
2079                 return 0;
2080         }
2081
2082         // get_inventory(self)
2083         static int l_get_inventory(lua_State *L)
2084         {
2085                 NodeMetaRef *ref = checkobject(L, 1);
2086                 getmeta(ref, true);  // try to ensure the metadata exists
2087                 InvRef::createNodeMeta(L, ref->m_p);
2088                 return 1;
2089         }
2090
2091         // get_inventory_draw_spec(self)
2092         static int l_get_inventory_draw_spec(lua_State *L)
2093         {
2094                 NodeMetaRef *ref = checkobject(L, 1);
2095
2096                 NodeMetadata *meta = getmeta(ref, false);
2097                 if(meta == NULL){
2098                         lua_pushlstring(L, "", 0);
2099                         return 1;
2100                 }
2101                 std::string str = meta->getString("formspec");
2102                 lua_pushlstring(L, str.c_str(), str.size());
2103                 return 1;
2104         }
2105
2106         // set_inventory_draw_spec(self, text)
2107         static int l_set_inventory_draw_spec(lua_State *L)
2108         {
2109                 NodeMetaRef *ref = checkobject(L, 1);
2110                 size_t len = 0;
2111                 const char *s = lua_tolstring(L, 2, &len);
2112                 std::string str(s, len);
2113
2114                 NodeMetadata *meta = getmeta(ref, !str.empty());
2115                 if(meta == NULL || str == meta->getString("formspec"))
2116                         return 0;
2117                 meta->setString("formspec",str);
2118                 reportMetadataChange(ref);
2119                 return 0;
2120         }
2121
2122         // get_form_spec(self)
2123         static int l_get_form_spec(lua_State *L)
2124         {
2125                 NodeMetaRef *ref = checkobject(L, 1);
2126
2127                 NodeMetadata *meta = getmeta(ref, false);
2128                 if(meta == NULL){
2129                         lua_pushlstring(L, "", 0);
2130                         return 1;
2131                 }
2132                 std::string str = meta->getString("formspec");
2133                 lua_pushlstring(L, str.c_str(), str.size());
2134                 return 1;
2135         }
2136
2137         // set_form_spec(self, text)
2138         static int l_set_form_spec(lua_State *L)
2139         {
2140                 NodeMetaRef *ref = checkobject(L, 1);
2141                 size_t len = 0;
2142                 const char *s = lua_tolstring(L, 2, &len);
2143                 std::string str(s, len);
2144
2145                 NodeMetadata *meta = getmeta(ref, !str.empty());
2146                 if(meta == NULL || str == meta->getString("formspec"))
2147                         return 0;
2148                 meta->setString("formspec",str);
2149                 reportMetadataChange(ref);
2150                 return 0;
2151         }
2152
2153         // get_infotext(self)
2154         static int l_get_infotext(lua_State *L)
2155         {
2156                 NodeMetaRef *ref = checkobject(L, 1);
2157
2158                 NodeMetadata *meta = getmeta(ref, false);
2159                 if(meta == NULL){
2160                         lua_pushlstring(L, "", 0);
2161                         return 1;
2162                 }
2163                 std::string str = meta->getString("infotext");
2164                 lua_pushlstring(L, str.c_str(), str.size());
2165                 return 1;
2166         }
2167
2168         // set_infotext(self, text)
2169         static int l_set_infotext(lua_State *L)
2170         {
2171                 NodeMetaRef *ref = checkobject(L, 1);
2172                 size_t len = 0;
2173                 const char *s = lua_tolstring(L, 2, &len);
2174                 std::string str(s, len);
2175
2176                 NodeMetadata *meta = getmeta(ref, !str.empty());
2177                 if(meta == NULL || str == meta->getString("infotext"))
2178                         return 0;
2179                 meta->setString("infotext",str);
2180                 reportMetadataChange(ref);
2181                 return 0;
2182         }
2183
2184 public:
2185         NodeMetaRef(v3s16 p, ServerEnvironment *env):
2186                 m_p(p),
2187                 m_env(env)
2188         {
2189         }
2190
2191         ~NodeMetaRef()
2192         {
2193         }
2194
2195         // Creates an NodeMetaRef and leaves it on top of stack
2196         // Not callable from Lua; all references are created on the C side.
2197         static void create(lua_State *L, v3s16 p, ServerEnvironment *env)
2198         {
2199                 NodeMetaRef *o = new NodeMetaRef(p, env);
2200                 //infostream<<"NodeMetaRef::create: o="<<o<<std::endl;
2201                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2202                 luaL_getmetatable(L, className);
2203                 lua_setmetatable(L, -2);
2204         }
2205
2206         static void Register(lua_State *L)
2207         {
2208                 lua_newtable(L);
2209                 int methodtable = lua_gettop(L);
2210                 luaL_newmetatable(L, className);
2211                 int metatable = lua_gettop(L);
2212
2213                 lua_pushliteral(L, "__metatable");
2214                 lua_pushvalue(L, methodtable);
2215                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2216
2217                 lua_pushliteral(L, "__index");
2218                 lua_pushvalue(L, methodtable);
2219                 lua_settable(L, metatable);
2220
2221                 lua_pushliteral(L, "__gc");
2222                 lua_pushcfunction(L, gc_object);
2223                 lua_settable(L, metatable);
2224
2225                 lua_pop(L, 1);  // drop metatable
2226
2227                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2228                 lua_pop(L, 1);  // drop methodtable
2229
2230                 // Cannot be created from Lua
2231                 //lua_register(L, className, create_object);
2232         }
2233 };
2234 const char NodeMetaRef::className[] = "NodeMetaRef";
2235 const luaL_reg NodeMetaRef::methods[] = {
2236         method(NodeMetaRef, get_string),
2237         method(NodeMetaRef, set_string),
2238         method(NodeMetaRef, get_int),
2239         method(NodeMetaRef, set_int),
2240         method(NodeMetaRef, get_float),
2241         method(NodeMetaRef, set_float),
2242         method(NodeMetaRef, get_inventory),
2243         method(NodeMetaRef, get_inventory_draw_spec),
2244         method(NodeMetaRef, set_inventory_draw_spec),
2245         method(NodeMetaRef, get_form_spec),
2246         method(NodeMetaRef, set_form_spec),
2247         method(NodeMetaRef, get_infotext),
2248         method(NodeMetaRef, set_infotext),
2249         {0,0}
2250 };
2251
2252 /*
2253         ObjectRef
2254 */
2255
2256 class ObjectRef
2257 {
2258 private:
2259         ServerActiveObject *m_object;
2260
2261         static const char className[];
2262         static const luaL_reg methods[];
2263 public:
2264         static ObjectRef *checkobject(lua_State *L, int narg)
2265         {
2266                 luaL_checktype(L, narg, LUA_TUSERDATA);
2267                 void *ud = luaL_checkudata(L, narg, className);
2268                 if(!ud) luaL_typerror(L, narg, className);
2269                 return *(ObjectRef**)ud;  // unbox pointer
2270         }
2271
2272         static ServerActiveObject* getobject(ObjectRef *ref)
2273         {
2274                 ServerActiveObject *co = ref->m_object;
2275                 return co;
2276         }
2277 private:
2278         static LuaEntitySAO* getluaobject(ObjectRef *ref)
2279         {
2280                 ServerActiveObject *obj = getobject(ref);
2281                 if(obj == NULL)
2282                         return NULL;
2283                 if(obj->getType() != ACTIVEOBJECT_TYPE_LUAENTITY)
2284                         return NULL;
2285                 return (LuaEntitySAO*)obj;
2286         }
2287
2288         static PlayerSAO* getplayersao(ObjectRef *ref)
2289         {
2290                 ServerActiveObject *obj = getobject(ref);
2291                 if(obj == NULL)
2292                         return NULL;
2293                 if(obj->getType() != ACTIVEOBJECT_TYPE_PLAYER)
2294                         return NULL;
2295                 return (PlayerSAO*)obj;
2296         }
2297
2298         static Player* getplayer(ObjectRef *ref)
2299         {
2300                 PlayerSAO *playersao = getplayersao(ref);
2301                 if(playersao == NULL)
2302                         return NULL;
2303                 return playersao->getPlayer();
2304         }
2305
2306         // Exported functions
2307
2308         // garbage collector
2309         static int gc_object(lua_State *L) {
2310                 ObjectRef *o = *(ObjectRef **)(lua_touserdata(L, 1));
2311                 //infostream<<"ObjectRef::gc_object: o="<<o<<std::endl;
2312                 delete o;
2313                 return 0;
2314         }
2315
2316         // remove(self)
2317         static int l_remove(lua_State *L)
2318         {
2319                 ObjectRef *ref = checkobject(L, 1);
2320                 ServerActiveObject *co = getobject(ref);
2321                 if(co == NULL) return 0;
2322                 verbosestream<<"ObjectRef::l_remove(): id="<<co->getId()<<std::endl;
2323                 co->m_removed = true;
2324                 return 0;
2325         }
2326
2327         // getpos(self)
2328         // returns: {x=num, y=num, z=num}
2329         static int l_getpos(lua_State *L)
2330         {
2331                 ObjectRef *ref = checkobject(L, 1);
2332                 ServerActiveObject *co = getobject(ref);
2333                 if(co == NULL) return 0;
2334                 v3f pos = co->getBasePosition() / BS;
2335                 lua_newtable(L);
2336                 lua_pushnumber(L, pos.X);
2337                 lua_setfield(L, -2, "x");
2338                 lua_pushnumber(L, pos.Y);
2339                 lua_setfield(L, -2, "y");
2340                 lua_pushnumber(L, pos.Z);
2341                 lua_setfield(L, -2, "z");
2342                 return 1;
2343         }
2344
2345         // setpos(self, pos)
2346         static int l_setpos(lua_State *L)
2347         {
2348                 ObjectRef *ref = checkobject(L, 1);
2349                 //LuaEntitySAO *co = getluaobject(ref);
2350                 ServerActiveObject *co = getobject(ref);
2351                 if(co == NULL) return 0;
2352                 // pos
2353                 v3f pos = checkFloatPos(L, 2);
2354                 // Do it
2355                 co->setPos(pos);
2356                 return 0;
2357         }
2358
2359         // moveto(self, pos, continuous=false)
2360         static int l_moveto(lua_State *L)
2361         {
2362                 ObjectRef *ref = checkobject(L, 1);
2363                 //LuaEntitySAO *co = getluaobject(ref);
2364                 ServerActiveObject *co = getobject(ref);
2365                 if(co == NULL) return 0;
2366                 // pos
2367                 v3f pos = checkFloatPos(L, 2);
2368                 // continuous
2369                 bool continuous = lua_toboolean(L, 3);
2370                 // Do it
2371                 co->moveTo(pos, continuous);
2372                 return 0;
2373         }
2374
2375         // punch(self, puncher, tool_capabilities, direction, time_from_last_punch)
2376         static int l_punch(lua_State *L)
2377         {
2378                 ObjectRef *ref = checkobject(L, 1);
2379                 ObjectRef *puncher_ref = checkobject(L, 2);
2380                 ServerActiveObject *co = getobject(ref);
2381                 ServerActiveObject *puncher = getobject(puncher_ref);
2382                 if(co == NULL) return 0;
2383                 if(puncher == NULL) return 0;
2384                 ToolCapabilities toolcap = read_tool_capabilities(L, 3);
2385                 v3f dir = read_v3f(L, 4);
2386                 float time_from_last_punch = 1000000;
2387                 if(lua_isnumber(L, 5))
2388                         time_from_last_punch = lua_tonumber(L, 5);
2389                 // Do it
2390                 puncher->punch(dir, &toolcap, puncher, time_from_last_punch);
2391                 return 0;
2392         }
2393
2394         // right_click(self, clicker); clicker = an another ObjectRef
2395         static int l_right_click(lua_State *L)
2396         {
2397                 ObjectRef *ref = checkobject(L, 1);
2398                 ObjectRef *ref2 = checkobject(L, 2);
2399                 ServerActiveObject *co = getobject(ref);
2400                 ServerActiveObject *co2 = getobject(ref2);
2401                 if(co == NULL) return 0;
2402                 if(co2 == NULL) return 0;
2403                 // Do it
2404                 co->rightClick(co2);
2405                 return 0;
2406         }
2407
2408         // set_hp(self, hp)
2409         // hp = number of hitpoints (2 * number of hearts)
2410         // returns: nil
2411         static int l_set_hp(lua_State *L)
2412         {
2413                 ObjectRef *ref = checkobject(L, 1);
2414                 luaL_checknumber(L, 2);
2415                 ServerActiveObject *co = getobject(ref);
2416                 if(co == NULL) return 0;
2417                 int hp = lua_tonumber(L, 2);
2418                 /*infostream<<"ObjectRef::l_set_hp(): id="<<co->getId()
2419                                 <<" hp="<<hp<<std::endl;*/
2420                 // Do it
2421                 co->setHP(hp);
2422                 // Return
2423                 return 0;
2424         }
2425
2426         // get_hp(self)
2427         // returns: number of hitpoints (2 * number of hearts)
2428         // 0 if not applicable to this type of object
2429         static int l_get_hp(lua_State *L)
2430         {
2431                 ObjectRef *ref = checkobject(L, 1);
2432                 ServerActiveObject *co = getobject(ref);
2433                 if(co == NULL) return 0;
2434                 int hp = co->getHP();
2435                 /*infostream<<"ObjectRef::l_get_hp(): id="<<co->getId()
2436                                 <<" hp="<<hp<<std::endl;*/
2437                 // Return
2438                 lua_pushnumber(L, hp);
2439                 return 1;
2440         }
2441
2442         // get_inventory(self)
2443         static int l_get_inventory(lua_State *L)
2444         {
2445                 ObjectRef *ref = checkobject(L, 1);
2446                 ServerActiveObject *co = getobject(ref);
2447                 if(co == NULL) return 0;
2448                 // Do it
2449                 InventoryLocation loc = co->getInventoryLocation();
2450                 if(get_server(L)->getInventory(loc) != NULL)
2451                         InvRef::create(L, loc);
2452                 else
2453                         lua_pushnil(L);
2454                 return 1;
2455         }
2456
2457         // get_wield_list(self)
2458         static int l_get_wield_list(lua_State *L)
2459         {
2460                 ObjectRef *ref = checkobject(L, 1);
2461                 ServerActiveObject *co = getobject(ref);
2462                 if(co == NULL) return 0;
2463                 // Do it
2464                 lua_pushstring(L, co->getWieldList().c_str());
2465                 return 1;
2466         }
2467
2468         // get_wield_index(self)
2469         static int l_get_wield_index(lua_State *L)
2470         {
2471                 ObjectRef *ref = checkobject(L, 1);
2472                 ServerActiveObject *co = getobject(ref);
2473                 if(co == NULL) return 0;
2474                 // Do it
2475                 lua_pushinteger(L, co->getWieldIndex() + 1);
2476                 return 1;
2477         }
2478
2479         // get_wielded_item(self)
2480         static int l_get_wielded_item(lua_State *L)
2481         {
2482                 ObjectRef *ref = checkobject(L, 1);
2483                 ServerActiveObject *co = getobject(ref);
2484                 if(co == NULL) return 0;
2485                 // Do it
2486                 LuaItemStack::create(L, co->getWieldedItem());
2487                 return 1;
2488         }
2489
2490         // set_wielded_item(self, itemstack or itemstring or table or nil)
2491         static int l_set_wielded_item(lua_State *L)
2492         {
2493                 ObjectRef *ref = checkobject(L, 1);
2494                 ServerActiveObject *co = getobject(ref);
2495                 if(co == NULL) return 0;
2496                 // Do it
2497                 ItemStack item = read_item(L, 2);
2498                 bool success = co->setWieldedItem(item);
2499                 lua_pushboolean(L, success);
2500                 return 1;
2501         }
2502
2503         // set_armor_groups(self, groups)
2504         static int l_set_armor_groups(lua_State *L)
2505         {
2506                 ObjectRef *ref = checkobject(L, 1);
2507                 ServerActiveObject *co = getobject(ref);
2508                 if(co == NULL) return 0;
2509                 // Do it
2510                 ItemGroupList groups;
2511                 read_groups(L, 2, groups);
2512                 co->setArmorGroups(groups);
2513                 return 0;
2514         }
2515
2516         // set_properties(self, properties)
2517         static int l_set_properties(lua_State *L)
2518         {
2519                 ObjectRef *ref = checkobject(L, 1);
2520                 ServerActiveObject *co = getobject(ref);
2521                 if(co == NULL) return 0;
2522                 ObjectProperties *prop = co->accessObjectProperties();
2523                 if(!prop)
2524                         return 0;
2525                 read_object_properties(L, 2, prop);
2526                 co->notifyObjectPropertiesModified();
2527                 return 0;
2528         }
2529
2530         /* LuaEntitySAO-only */
2531
2532         // setvelocity(self, {x=num, y=num, z=num})
2533         static int l_setvelocity(lua_State *L)
2534         {
2535                 ObjectRef *ref = checkobject(L, 1);
2536                 LuaEntitySAO *co = getluaobject(ref);
2537                 if(co == NULL) return 0;
2538                 v3f pos = checkFloatPos(L, 2);
2539                 // Do it
2540                 co->setVelocity(pos);
2541                 return 0;
2542         }
2543
2544         // getvelocity(self)
2545         static int l_getvelocity(lua_State *L)
2546         {
2547                 ObjectRef *ref = checkobject(L, 1);
2548                 LuaEntitySAO *co = getluaobject(ref);
2549                 if(co == NULL) return 0;
2550                 // Do it
2551                 v3f v = co->getVelocity();
2552                 pushFloatPos(L, v);
2553                 return 1;
2554         }
2555
2556         // setacceleration(self, {x=num, y=num, z=num})
2557         static int l_setacceleration(lua_State *L)
2558         {
2559                 ObjectRef *ref = checkobject(L, 1);
2560                 LuaEntitySAO *co = getluaobject(ref);
2561                 if(co == NULL) return 0;
2562                 // pos
2563                 v3f pos = checkFloatPos(L, 2);
2564                 // Do it
2565                 co->setAcceleration(pos);
2566                 return 0;
2567         }
2568
2569         // getacceleration(self)
2570         static int l_getacceleration(lua_State *L)
2571         {
2572                 ObjectRef *ref = checkobject(L, 1);
2573                 LuaEntitySAO *co = getluaobject(ref);
2574                 if(co == NULL) return 0;
2575                 // Do it
2576                 v3f v = co->getAcceleration();
2577                 pushFloatPos(L, v);
2578                 return 1;
2579         }
2580
2581         // setyaw(self, radians)
2582         static int l_setyaw(lua_State *L)
2583         {
2584                 ObjectRef *ref = checkobject(L, 1);
2585                 LuaEntitySAO *co = getluaobject(ref);
2586                 if(co == NULL) return 0;
2587                 float yaw = luaL_checknumber(L, 2) * core::RADTODEG;
2588                 // Do it
2589                 co->setYaw(yaw);
2590                 return 0;
2591         }
2592
2593         // getyaw(self)
2594         static int l_getyaw(lua_State *L)
2595         {
2596                 ObjectRef *ref = checkobject(L, 1);
2597                 LuaEntitySAO *co = getluaobject(ref);
2598                 if(co == NULL) return 0;
2599                 // Do it
2600                 float yaw = co->getYaw() * core::DEGTORAD;
2601                 lua_pushnumber(L, yaw);
2602                 return 1;
2603         }
2604
2605         // settexturemod(self, mod)
2606         static int l_settexturemod(lua_State *L)
2607         {
2608                 ObjectRef *ref = checkobject(L, 1);
2609                 LuaEntitySAO *co = getluaobject(ref);
2610                 if(co == NULL) return 0;
2611                 // Do it
2612                 std::string mod = luaL_checkstring(L, 2);
2613                 co->setTextureMod(mod);
2614                 return 0;
2615         }
2616
2617         // setsprite(self, p={x=0,y=0}, num_frames=1, framelength=0.2,
2618         //           select_horiz_by_yawpitch=false)
2619         static int l_setsprite(lua_State *L)
2620         {
2621                 ObjectRef *ref = checkobject(L, 1);
2622                 LuaEntitySAO *co = getluaobject(ref);
2623                 if(co == NULL) return 0;
2624                 // Do it
2625                 v2s16 p(0,0);
2626                 if(!lua_isnil(L, 2))
2627                         p = read_v2s16(L, 2);
2628                 int num_frames = 1;
2629                 if(!lua_isnil(L, 3))
2630                         num_frames = lua_tonumber(L, 3);
2631                 float framelength = 0.2;
2632                 if(!lua_isnil(L, 4))
2633                         framelength = lua_tonumber(L, 4);
2634                 bool select_horiz_by_yawpitch = false;
2635                 if(!lua_isnil(L, 5))
2636                         select_horiz_by_yawpitch = lua_toboolean(L, 5);
2637                 co->setSprite(p, num_frames, framelength, select_horiz_by_yawpitch);
2638                 return 0;
2639         }
2640
2641         // DEPRECATED
2642         // get_entity_name(self)
2643         static int l_get_entity_name(lua_State *L)
2644         {
2645                 ObjectRef *ref = checkobject(L, 1);
2646                 LuaEntitySAO *co = getluaobject(ref);
2647                 if(co == NULL) return 0;
2648                 // Do it
2649                 std::string name = co->getName();
2650                 lua_pushstring(L, name.c_str());
2651                 return 1;
2652         }
2653
2654         // get_luaentity(self)
2655         static int l_get_luaentity(lua_State *L)
2656         {
2657                 ObjectRef *ref = checkobject(L, 1);
2658                 LuaEntitySAO *co = getluaobject(ref);
2659                 if(co == NULL) return 0;
2660                 // Do it
2661                 luaentity_get(L, co->getId());
2662                 return 1;
2663         }
2664
2665         /* Player-only */
2666
2667         // get_player_name(self)
2668         static int l_get_player_name(lua_State *L)
2669         {
2670                 ObjectRef *ref = checkobject(L, 1);
2671                 Player *player = getplayer(ref);
2672                 if(player == NULL){
2673                         lua_pushnil(L);
2674                         return 1;
2675                 }
2676                 // Do it
2677                 lua_pushstring(L, player->getName());
2678                 return 1;
2679         }
2680
2681         // get_look_dir(self)
2682         static int l_get_look_dir(lua_State *L)
2683         {
2684                 ObjectRef *ref = checkobject(L, 1);
2685                 Player *player = getplayer(ref);
2686                 if(player == NULL) return 0;
2687                 // Do it
2688                 float pitch = player->getRadPitch();
2689                 float yaw = player->getRadYaw();
2690                 v3f v(cos(pitch)*cos(yaw), sin(pitch), cos(pitch)*sin(yaw));
2691                 push_v3f(L, v);
2692                 return 1;
2693         }
2694
2695         // get_look_pitch(self)
2696         static int l_get_look_pitch(lua_State *L)
2697         {
2698                 ObjectRef *ref = checkobject(L, 1);
2699                 Player *player = getplayer(ref);
2700                 if(player == NULL) return 0;
2701                 // Do it
2702                 lua_pushnumber(L, player->getRadPitch());
2703                 return 1;
2704         }
2705
2706         // get_look_yaw(self)
2707         static int l_get_look_yaw(lua_State *L)
2708         {
2709                 ObjectRef *ref = checkobject(L, 1);
2710                 Player *player = getplayer(ref);
2711                 if(player == NULL) return 0;
2712                 // Do it
2713                 lua_pushnumber(L, player->getRadYaw());
2714                 return 1;
2715         }
2716
2717 public:
2718         ObjectRef(ServerActiveObject *object):
2719                 m_object(object)
2720         {
2721                 //infostream<<"ObjectRef created for id="<<m_object->getId()<<std::endl;
2722         }
2723
2724         ~ObjectRef()
2725         {
2726                 /*if(m_object)
2727                         infostream<<"ObjectRef destructing for id="
2728                                         <<m_object->getId()<<std::endl;
2729                 else
2730                         infostream<<"ObjectRef destructing for id=unknown"<<std::endl;*/
2731         }
2732
2733         // Creates an ObjectRef and leaves it on top of stack
2734         // Not callable from Lua; all references are created on the C side.
2735         static void create(lua_State *L, ServerActiveObject *object)
2736         {
2737                 ObjectRef *o = new ObjectRef(object);
2738                 //infostream<<"ObjectRef::create: o="<<o<<std::endl;
2739                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2740                 luaL_getmetatable(L, className);
2741                 lua_setmetatable(L, -2);
2742         }
2743
2744         static void set_null(lua_State *L)
2745         {
2746                 ObjectRef *o = checkobject(L, -1);
2747                 o->m_object = NULL;
2748         }
2749
2750         static void Register(lua_State *L)
2751         {
2752                 lua_newtable(L);
2753                 int methodtable = lua_gettop(L);
2754                 luaL_newmetatable(L, className);
2755                 int metatable = lua_gettop(L);
2756
2757                 lua_pushliteral(L, "__metatable");
2758                 lua_pushvalue(L, methodtable);
2759                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2760
2761                 lua_pushliteral(L, "__index");
2762                 lua_pushvalue(L, methodtable);
2763                 lua_settable(L, metatable);
2764
2765                 lua_pushliteral(L, "__gc");
2766                 lua_pushcfunction(L, gc_object);
2767                 lua_settable(L, metatable);
2768
2769                 lua_pop(L, 1);  // drop metatable
2770
2771                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2772                 lua_pop(L, 1);  // drop methodtable
2773
2774                 // Cannot be created from Lua
2775                 //lua_register(L, className, create_object);
2776         }
2777 };
2778 const char ObjectRef::className[] = "ObjectRef";
2779 const luaL_reg ObjectRef::methods[] = {
2780         // ServerActiveObject
2781         method(ObjectRef, remove),
2782         method(ObjectRef, getpos),
2783         method(ObjectRef, setpos),
2784         method(ObjectRef, moveto),
2785         method(ObjectRef, punch),
2786         method(ObjectRef, right_click),
2787         method(ObjectRef, set_hp),
2788         method(ObjectRef, get_hp),
2789         method(ObjectRef, get_inventory),
2790         method(ObjectRef, get_wield_list),
2791         method(ObjectRef, get_wield_index),
2792         method(ObjectRef, get_wielded_item),
2793         method(ObjectRef, set_wielded_item),
2794         method(ObjectRef, set_armor_groups),
2795         method(ObjectRef, set_properties),
2796         // LuaEntitySAO-only
2797         method(ObjectRef, setvelocity),
2798         method(ObjectRef, getvelocity),
2799         method(ObjectRef, setacceleration),
2800         method(ObjectRef, getacceleration),
2801         method(ObjectRef, setyaw),
2802         method(ObjectRef, getyaw),
2803         method(ObjectRef, settexturemod),
2804         method(ObjectRef, setsprite),
2805         method(ObjectRef, get_entity_name),
2806         method(ObjectRef, get_luaentity),
2807         // Player-only
2808         method(ObjectRef, get_player_name),
2809         method(ObjectRef, get_look_dir),
2810         method(ObjectRef, get_look_pitch),
2811         method(ObjectRef, get_look_yaw),
2812         {0,0}
2813 };
2814
2815 // Creates a new anonymous reference if id=0
2816 static void objectref_get_or_create(lua_State *L,
2817                 ServerActiveObject *cobj)
2818 {
2819         if(cobj->getId() == 0){
2820                 ObjectRef::create(L, cobj);
2821         } else {
2822                 objectref_get(L, cobj->getId());
2823         }
2824 }
2825
2826
2827 /*
2828   PerlinNoise
2829  */
2830
2831 class LuaPerlinNoise
2832 {
2833 private:
2834         int seed;
2835         int octaves;
2836         double persistence;
2837         double scale;
2838         static const char className[];
2839         static const luaL_reg methods[];
2840
2841         // Exported functions
2842
2843         // garbage collector
2844         static int gc_object(lua_State *L)
2845         {
2846                 LuaPerlinNoise *o = *(LuaPerlinNoise **)(lua_touserdata(L, 1));
2847                 delete o;
2848                 return 0;
2849         }
2850
2851         static int l_get2d(lua_State *L)
2852         {
2853                 LuaPerlinNoise *o = checkobject(L, 1);
2854                 v2f pos2d = read_v2f(L,2);
2855                 lua_Number val = noise2d_perlin(pos2d.X/o->scale, pos2d.Y/o->scale, o->seed, o->octaves, o->persistence);
2856                 lua_pushnumber(L, val);
2857                 return 1;
2858         }
2859         static int l_get3d(lua_State *L)
2860         {
2861                 LuaPerlinNoise *o = checkobject(L, 1);
2862                 v3f pos3d = read_v3f(L,2);
2863                 lua_Number val = noise3d_perlin(pos3d.X/o->scale, pos3d.Y/o->scale, pos3d.Z/o->scale, o->seed, o->octaves, o->persistence);
2864                 lua_pushnumber(L, val);
2865                 return 1;
2866         }
2867
2868 public:
2869         LuaPerlinNoise(int a_seed, int a_octaves, double a_persistence,
2870                         double a_scale):
2871                 seed(a_seed),
2872                 octaves(a_octaves),
2873                 persistence(a_persistence),
2874                 scale(a_scale)
2875         {
2876         }
2877
2878         ~LuaPerlinNoise()
2879         {
2880         }
2881
2882         // LuaPerlinNoise(seed, octaves, persistence, scale)
2883         // Creates an LuaPerlinNoise and leaves it on top of stack
2884         static int create_object(lua_State *L)
2885         {
2886                 int seed = luaL_checkint(L, 1);
2887                 int octaves = luaL_checkint(L, 2);
2888                 double persistence = luaL_checknumber(L, 3);
2889                 double scale = luaL_checknumber(L, 4);
2890                 LuaPerlinNoise *o = new LuaPerlinNoise(seed, octaves, persistence, scale);
2891                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2892                 luaL_getmetatable(L, className);
2893                 lua_setmetatable(L, -2);
2894                 return 1;
2895         }
2896
2897         static LuaPerlinNoise* checkobject(lua_State *L, int narg)
2898         {
2899                 luaL_checktype(L, narg, LUA_TUSERDATA);
2900                 void *ud = luaL_checkudata(L, narg, className);
2901                 if(!ud) luaL_typerror(L, narg, className);
2902                 return *(LuaPerlinNoise**)ud;  // unbox pointer
2903         }
2904
2905         static void Register(lua_State *L)
2906         {
2907                 lua_newtable(L);
2908                 int methodtable = lua_gettop(L);
2909                 luaL_newmetatable(L, className);
2910                 int metatable = lua_gettop(L);
2911
2912                 lua_pushliteral(L, "__metatable");
2913                 lua_pushvalue(L, methodtable);
2914                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2915
2916                 lua_pushliteral(L, "__index");
2917                 lua_pushvalue(L, methodtable);
2918                 lua_settable(L, metatable);
2919
2920                 lua_pushliteral(L, "__gc");
2921                 lua_pushcfunction(L, gc_object);
2922                 lua_settable(L, metatable);
2923
2924                 lua_pop(L, 1);  // drop metatable
2925
2926                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2927                 lua_pop(L, 1);  // drop methodtable
2928
2929                 // Can be created from Lua (PerlinNoise(seed, octaves, persistence)
2930                 lua_register(L, className, create_object);
2931         }
2932 };
2933 const char LuaPerlinNoise::className[] = "PerlinNoise";
2934 const luaL_reg LuaPerlinNoise::methods[] = {
2935         method(LuaPerlinNoise, get2d),
2936         method(LuaPerlinNoise, get3d),
2937         {0,0}
2938 };
2939
2940 /*
2941         EnvRef
2942 */
2943
2944 class EnvRef
2945 {
2946 private:
2947         ServerEnvironment *m_env;
2948
2949         static const char className[];
2950         static const luaL_reg methods[];
2951
2952         static int gc_object(lua_State *L) {
2953                 EnvRef *o = *(EnvRef **)(lua_touserdata(L, 1));
2954                 delete o;
2955                 return 0;
2956         }
2957
2958         static EnvRef *checkobject(lua_State *L, int narg)
2959         {
2960                 luaL_checktype(L, narg, LUA_TUSERDATA);
2961                 void *ud = luaL_checkudata(L, narg, className);
2962                 if(!ud) luaL_typerror(L, narg, className);
2963                 return *(EnvRef**)ud;  // unbox pointer
2964         }
2965
2966         // Exported functions
2967
2968         // EnvRef:set_node(pos, node)
2969         // pos = {x=num, y=num, z=num}
2970         static int l_set_node(lua_State *L)
2971         {
2972                 //infostream<<"EnvRef::l_set_node()"<<std::endl;
2973                 EnvRef *o = checkobject(L, 1);
2974                 ServerEnvironment *env = o->m_env;
2975                 if(env == NULL) return 0;
2976                 // pos
2977                 v3s16 pos = read_v3s16(L, 2);
2978                 // content
2979                 MapNode n = readnode(L, 3, env->getGameDef()->ndef());
2980                 // Do it
2981                 bool succeeded = env->getMap().addNodeWithEvent(pos, n);
2982                 lua_pushboolean(L, succeeded);
2983                 return 1;
2984         }
2985
2986         static int l_add_node(lua_State *L)
2987         {
2988                 return l_set_node(L);
2989         }
2990
2991         // EnvRef:remove_node(pos)
2992         // pos = {x=num, y=num, z=num}
2993         static int l_remove_node(lua_State *L)
2994         {
2995                 //infostream<<"EnvRef::l_remove_node()"<<std::endl;
2996                 EnvRef *o = checkobject(L, 1);
2997                 ServerEnvironment *env = o->m_env;
2998                 if(env == NULL) return 0;
2999                 // pos
3000                 v3s16 pos = read_v3s16(L, 2);
3001                 // Do it
3002                 bool succeeded = env->getMap().removeNodeWithEvent(pos);
3003                 lua_pushboolean(L, succeeded);
3004                 return 1;
3005         }
3006
3007         // EnvRef:get_node(pos)
3008         // pos = {x=num, y=num, z=num}
3009         static int l_get_node(lua_State *L)
3010         {
3011                 //infostream<<"EnvRef::l_get_node()"<<std::endl;
3012                 EnvRef *o = checkobject(L, 1);
3013                 ServerEnvironment *env = o->m_env;
3014                 if(env == NULL) return 0;
3015                 // pos
3016                 v3s16 pos = read_v3s16(L, 2);
3017                 // Do it
3018                 MapNode n = env->getMap().getNodeNoEx(pos);
3019                 // Return node
3020                 pushnode(L, n, env->getGameDef()->ndef());
3021                 return 1;
3022         }
3023
3024         // EnvRef:get_node_or_nil(pos)
3025         // pos = {x=num, y=num, z=num}
3026         static int l_get_node_or_nil(lua_State *L)
3027         {
3028                 //infostream<<"EnvRef::l_get_node()"<<std::endl;
3029                 EnvRef *o = checkobject(L, 1);
3030                 ServerEnvironment *env = o->m_env;
3031                 if(env == NULL) return 0;
3032                 // pos
3033                 v3s16 pos = read_v3s16(L, 2);
3034                 // Do it
3035                 try{
3036                         MapNode n = env->getMap().getNode(pos);
3037                         // Return node
3038                         pushnode(L, n, env->getGameDef()->ndef());
3039                         return 1;
3040                 } catch(InvalidPositionException &e)
3041                 {
3042                         lua_pushnil(L);
3043                         return 1;
3044                 }
3045         }
3046
3047         // EnvRef:get_node_light(pos, timeofday)
3048         // pos = {x=num, y=num, z=num}
3049         // timeofday: nil = current time, 0 = night, 0.5 = day
3050         static int l_get_node_light(lua_State *L)
3051         {
3052                 EnvRef *o = checkobject(L, 1);
3053                 ServerEnvironment *env = o->m_env;
3054                 if(env == NULL) return 0;
3055                 // Do it
3056                 v3s16 pos = read_v3s16(L, 2);
3057                 u32 time_of_day = env->getTimeOfDay();
3058                 if(lua_isnumber(L, 3))
3059                         time_of_day = 24000.0 * lua_tonumber(L, 3);
3060                 time_of_day %= 24000;
3061                 u32 dnr = time_to_daynight_ratio(time_of_day);
3062                 MapNode n = env->getMap().getNodeNoEx(pos);
3063                 try{
3064                         MapNode n = env->getMap().getNode(pos);
3065                         INodeDefManager *ndef = env->getGameDef()->ndef();
3066                         lua_pushinteger(L, n.getLightBlend(dnr, ndef));
3067                         return 1;
3068                 } catch(InvalidPositionException &e)
3069                 {
3070                         lua_pushnil(L);
3071                         return 1;
3072                 }
3073         }
3074
3075         // EnvRef:add_entity(pos, entityname) -> ObjectRef or nil
3076         // pos = {x=num, y=num, z=num}
3077         static int l_add_entity(lua_State *L)
3078         {
3079                 //infostream<<"EnvRef::l_add_entity()"<<std::endl;
3080                 EnvRef *o = checkobject(L, 1);
3081                 ServerEnvironment *env = o->m_env;
3082                 if(env == NULL) return 0;
3083                 // pos
3084                 v3f pos = checkFloatPos(L, 2);
3085                 // content
3086                 const char *name = luaL_checkstring(L, 3);
3087                 // Do it
3088                 ServerActiveObject *obj = new LuaEntitySAO(env, pos, name, "");
3089                 int objectid = env->addActiveObject(obj);
3090                 // If failed to add, return nothing (reads as nil)
3091                 if(objectid == 0)
3092                         return 0;
3093                 // Return ObjectRef
3094                 objectref_get_or_create(L, obj);
3095                 return 1;
3096         }
3097
3098         // EnvRef:add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
3099         // pos = {x=num, y=num, z=num}
3100         static int l_add_item(lua_State *L)
3101         {
3102                 //infostream<<"EnvRef::l_add_item()"<<std::endl;
3103                 EnvRef *o = checkobject(L, 1);
3104                 ServerEnvironment *env = o->m_env;
3105                 if(env == NULL) return 0;
3106                 // pos
3107                 v3f pos = checkFloatPos(L, 2);
3108                 // item
3109                 ItemStack item = read_item(L, 3);
3110                 if(item.empty() || !item.isKnown(get_server(L)->idef()))
3111                         return 0;
3112                 // Use minetest.spawn_item to spawn a __builtin:item
3113                 lua_getglobal(L, "minetest");
3114                 lua_getfield(L, -1, "spawn_item");
3115                 if(lua_isnil(L, -1))
3116                         return 0;
3117                 lua_pushvalue(L, 2);
3118                 lua_pushstring(L, item.getItemString().c_str());
3119                 if(lua_pcall(L, 2, 1, 0))
3120                         script_error(L, "error: %s", lua_tostring(L, -1));
3121                 return 1;
3122                 /*lua_pushvalue(L, 1);
3123                 lua_pushstring(L, "__builtin:item");
3124                 lua_pushstring(L, item.getItemString().c_str());
3125                 return l_add_entity(L);*/
3126                 /*// Do it
3127                 ServerActiveObject *obj = createItemSAO(env, pos, item.getItemString());
3128                 int objectid = env->addActiveObject(obj);
3129                 // If failed to add, return nothing (reads as nil)
3130                 if(objectid == 0)
3131                         return 0;
3132                 // Return ObjectRef
3133                 objectref_get_or_create(L, obj);
3134                 return 1;*/
3135         }
3136
3137         // EnvRef:add_rat(pos)
3138         // pos = {x=num, y=num, z=num}
3139         static int l_add_rat(lua_State *L)
3140         {
3141                 infostream<<"EnvRef::l_add_rat(): C++ mobs have been removed."
3142                                 <<" Doing nothing."<<std::endl;
3143                 return 0;
3144         }
3145
3146         // EnvRef:add_firefly(pos)
3147         // pos = {x=num, y=num, z=num}
3148         static int l_add_firefly(lua_State *L)
3149         {
3150                 infostream<<"EnvRef::l_add_firefly(): C++ mobs have been removed."
3151                                 <<" Doing nothing."<<std::endl;
3152                 return 0;
3153         }
3154
3155         // EnvRef:get_meta(pos)
3156         static int l_get_meta(lua_State *L)
3157         {
3158                 //infostream<<"EnvRef::l_get_meta()"<<std::endl;
3159                 EnvRef *o = checkobject(L, 1);
3160                 ServerEnvironment *env = o->m_env;
3161                 if(env == NULL) return 0;
3162                 // Do it
3163                 v3s16 p = read_v3s16(L, 2);
3164                 NodeMetaRef::create(L, p, env);
3165                 return 1;
3166         }
3167
3168         // EnvRef:get_player_by_name(name)
3169         static int l_get_player_by_name(lua_State *L)
3170         {
3171                 EnvRef *o = checkobject(L, 1);
3172                 ServerEnvironment *env = o->m_env;
3173                 if(env == NULL) return 0;
3174                 // Do it
3175                 const char *name = luaL_checkstring(L, 2);
3176                 Player *player = env->getPlayer(name);
3177                 if(player == NULL){
3178                         lua_pushnil(L);
3179                         return 1;
3180                 }
3181                 PlayerSAO *sao = player->getPlayerSAO();
3182                 if(sao == NULL){
3183                         lua_pushnil(L);
3184                         return 1;
3185                 }
3186                 // Put player on stack
3187                 objectref_get_or_create(L, sao);
3188                 return 1;
3189         }
3190
3191         // EnvRef:get_objects_inside_radius(pos, radius)
3192         static int l_get_objects_inside_radius(lua_State *L)
3193         {
3194                 // Get the table insert function
3195                 lua_getglobal(L, "table");
3196                 lua_getfield(L, -1, "insert");
3197                 int table_insert = lua_gettop(L);
3198                 // Get environemnt
3199                 EnvRef *o = checkobject(L, 1);
3200                 ServerEnvironment *env = o->m_env;
3201                 if(env == NULL) return 0;
3202                 // Do it
3203                 v3f pos = checkFloatPos(L, 2);
3204                 float radius = luaL_checknumber(L, 3) * BS;
3205                 std::set<u16> ids = env->getObjectsInsideRadius(pos, radius);
3206                 lua_newtable(L);
3207                 int table = lua_gettop(L);
3208                 for(std::set<u16>::const_iterator
3209                                 i = ids.begin(); i != ids.end(); i++){
3210                         ServerActiveObject *obj = env->getActiveObject(*i);
3211                         // Insert object reference into table
3212                         lua_pushvalue(L, table_insert);
3213                         lua_pushvalue(L, table);
3214                         objectref_get_or_create(L, obj);
3215                         if(lua_pcall(L, 2, 0, 0))
3216                                 script_error(L, "error: %s", lua_tostring(L, -1));
3217                 }
3218                 return 1;
3219         }
3220
3221         // EnvRef:set_timeofday(val)
3222         // val = 0...1
3223         static int l_set_timeofday(lua_State *L)
3224         {
3225                 EnvRef *o = checkobject(L, 1);
3226                 ServerEnvironment *env = o->m_env;
3227                 if(env == NULL) return 0;
3228                 // Do it
3229                 float timeofday_f = luaL_checknumber(L, 2);
3230                 assert(timeofday_f >= 0.0 && timeofday_f <= 1.0);
3231                 int timeofday_mh = (int)(timeofday_f * 24000.0);
3232                 // This should be set directly in the environment but currently
3233                 // such changes aren't immediately sent to the clients, so call
3234                 // the server instead.
3235                 //env->setTimeOfDay(timeofday_mh);
3236                 get_server(L)->setTimeOfDay(timeofday_mh);
3237                 return 0;
3238         }
3239
3240         // EnvRef:get_timeofday() -> 0...1
3241         static int l_get_timeofday(lua_State *L)
3242         {
3243                 EnvRef *o = checkobject(L, 1);
3244                 ServerEnvironment *env = o->m_env;
3245                 if(env == NULL) return 0;
3246                 // Do it
3247                 int timeofday_mh = env->getTimeOfDay();
3248                 float timeofday_f = (float)timeofday_mh / 24000.0;
3249                 lua_pushnumber(L, timeofday_f);
3250                 return 1;
3251         }
3252
3253
3254         // EnvRef:find_node_near(pos, radius, nodenames) -> pos or nil
3255         // nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
3256         static int l_find_node_near(lua_State *L)
3257         {
3258                 EnvRef *o = checkobject(L, 1);
3259                 ServerEnvironment *env = o->m_env;
3260                 if(env == NULL) return 0;
3261                 INodeDefManager *ndef = get_server(L)->ndef();
3262                 v3s16 pos = read_v3s16(L, 2);
3263                 int radius = luaL_checkinteger(L, 3);
3264                 std::set<content_t> filter;
3265                 if(lua_istable(L, 4)){
3266                         int table = 4;
3267                         lua_pushnil(L);
3268                         while(lua_next(L, table) != 0){
3269                                 // key at index -2 and value at index -1
3270                                 luaL_checktype(L, -1, LUA_TSTRING);
3271                                 ndef->getIds(lua_tostring(L, -1), filter);
3272                                 // removes value, keeps key for next iteration
3273                                 lua_pop(L, 1);
3274                         }
3275                 } else if(lua_isstring(L, 4)){
3276                         ndef->getIds(lua_tostring(L, 4), filter);
3277                 }
3278
3279                 for(int d=1; d<=radius; d++){
3280                         core::list<v3s16> list;
3281                         getFacePositions(list, d);
3282                         for(core::list<v3s16>::Iterator i = list.begin();
3283                                         i != list.end(); i++){
3284                                 v3s16 p = pos + (*i);
3285                                 content_t c = env->getMap().getNodeNoEx(p).getContent();
3286                                 if(filter.count(c) != 0){
3287                                         push_v3s16(L, p);
3288                                         return 1;
3289                                 }
3290                         }
3291                 }
3292                 return 0;
3293         }
3294
3295         // EnvRef:find_nodes_in_area(minp, maxp, nodenames) -> list of positions
3296         // nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
3297         static int l_find_nodes_in_area(lua_State *L)
3298         {
3299                 EnvRef *o = checkobject(L, 1);
3300                 ServerEnvironment *env = o->m_env;
3301                 if(env == NULL) return 0;
3302                 INodeDefManager *ndef = get_server(L)->ndef();
3303                 v3s16 minp = read_v3s16(L, 2);
3304                 v3s16 maxp = read_v3s16(L, 3);
3305                 std::set<content_t> filter;
3306                 if(lua_istable(L, 4)){
3307                         int table = 4;
3308                         lua_pushnil(L);
3309                         while(lua_next(L, table) != 0){
3310                                 // key at index -2 and value at index -1
3311                                 luaL_checktype(L, -1, LUA_TSTRING);
3312                                 ndef->getIds(lua_tostring(L, -1), filter);
3313                                 // removes value, keeps key for next iteration
3314                                 lua_pop(L, 1);
3315                         }
3316                 } else if(lua_isstring(L, 4)){
3317                         ndef->getIds(lua_tostring(L, 4), filter);
3318                 }
3319
3320                 // Get the table insert function
3321                 lua_getglobal(L, "table");
3322                 lua_getfield(L, -1, "insert");
3323                 int table_insert = lua_gettop(L);
3324
3325                 lua_newtable(L);
3326                 int table = lua_gettop(L);
3327                 for(s16 x=minp.X; x<=maxp.X; x++)
3328                 for(s16 y=minp.Y; y<=maxp.Y; y++)
3329                 for(s16 z=minp.Z; z<=maxp.Z; z++)
3330                 {
3331                         v3s16 p(x,y,z);
3332                         content_t c = env->getMap().getNodeNoEx(p).getContent();
3333                         if(filter.count(c) != 0){
3334                                 lua_pushvalue(L, table_insert);
3335                                 lua_pushvalue(L, table);
3336                                 push_v3s16(L, p);
3337                                 if(lua_pcall(L, 2, 0, 0))
3338                                         script_error(L, "error: %s", lua_tostring(L, -1));
3339                         }
3340                 }
3341                 return 1;
3342         }
3343
3344         //      EnvRef:get_perlin(seeddiff, octaves, persistence, scale)
3345         //  returns world-specific PerlinNoise
3346         static int l_get_perlin(lua_State *L)
3347         {
3348                 EnvRef *o = checkobject(L, 1);
3349                 ServerEnvironment *env = o->m_env;
3350                 if(env == NULL) return 0;
3351
3352                 int seeddiff = luaL_checkint(L, 2);
3353                 int octaves = luaL_checkint(L, 3);
3354                 double persistence = luaL_checknumber(L, 4);
3355                 double scale = luaL_checknumber(L, 5);
3356
3357                 LuaPerlinNoise *n = new LuaPerlinNoise(seeddiff + int(env->getServerMap().getSeed()), octaves, persistence, scale);
3358                 *(void **)(lua_newuserdata(L, sizeof(void *))) = n;
3359                 luaL_getmetatable(L, "PerlinNoise");
3360                 lua_setmetatable(L, -2);
3361                 return 1;
3362         }
3363
3364 public:
3365         EnvRef(ServerEnvironment *env):
3366                 m_env(env)
3367         {
3368                 //infostream<<"EnvRef created"<<std::endl;
3369         }
3370
3371         ~EnvRef()
3372         {
3373                 //infostream<<"EnvRef destructing"<<std::endl;
3374         }
3375
3376         // Creates an EnvRef and leaves it on top of stack
3377         // Not callable from Lua; all references are created on the C side.
3378         static void create(lua_State *L, ServerEnvironment *env)
3379         {
3380                 EnvRef *o = new EnvRef(env);
3381                 //infostream<<"EnvRef::create: o="<<o<<std::endl;
3382                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
3383                 luaL_getmetatable(L, className);
3384                 lua_setmetatable(L, -2);
3385         }
3386
3387         static void set_null(lua_State *L)
3388         {
3389                 EnvRef *o = checkobject(L, -1);
3390                 o->m_env = NULL;
3391         }
3392
3393         static void Register(lua_State *L)
3394         {
3395                 lua_newtable(L);
3396                 int methodtable = lua_gettop(L);
3397                 luaL_newmetatable(L, className);
3398                 int metatable = lua_gettop(L);
3399
3400                 lua_pushliteral(L, "__metatable");
3401                 lua_pushvalue(L, methodtable);
3402                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
3403
3404                 lua_pushliteral(L, "__index");
3405                 lua_pushvalue(L, methodtable);
3406                 lua_settable(L, metatable);
3407
3408                 lua_pushliteral(L, "__gc");
3409                 lua_pushcfunction(L, gc_object);
3410                 lua_settable(L, metatable);
3411
3412                 lua_pop(L, 1);  // drop metatable
3413
3414                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3415                 lua_pop(L, 1);  // drop methodtable
3416
3417                 // Cannot be created from Lua
3418                 //lua_register(L, className, create_object);
3419         }
3420 };
3421 const char EnvRef::className[] = "EnvRef";
3422 const luaL_reg EnvRef::methods[] = {
3423         method(EnvRef, set_node),
3424         method(EnvRef, add_node),
3425         method(EnvRef, remove_node),
3426         method(EnvRef, get_node),
3427         method(EnvRef, get_node_or_nil),
3428         method(EnvRef, get_node_light),
3429         method(EnvRef, add_entity),
3430         method(EnvRef, add_item),
3431         method(EnvRef, add_rat),
3432         method(EnvRef, add_firefly),
3433         method(EnvRef, get_meta),
3434         method(EnvRef, get_player_by_name),
3435         method(EnvRef, get_objects_inside_radius),
3436         method(EnvRef, set_timeofday),
3437         method(EnvRef, get_timeofday),
3438         method(EnvRef, find_node_near),
3439         method(EnvRef, find_nodes_in_area),
3440         method(EnvRef, get_perlin),
3441         {0,0}
3442 };
3443
3444 /*
3445         LuaPseudoRandom
3446 */
3447
3448
3449 class LuaPseudoRandom
3450 {
3451 private:
3452         PseudoRandom m_pseudo;
3453
3454         static const char className[];
3455         static const luaL_reg methods[];
3456
3457         // Exported functions
3458
3459         // garbage collector
3460         static int gc_object(lua_State *L)
3461         {
3462                 LuaPseudoRandom *o = *(LuaPseudoRandom **)(lua_touserdata(L, 1));
3463                 delete o;
3464                 return 0;
3465         }
3466
3467         // next(self, min=0, max=32767) -> get next value
3468         static int l_next(lua_State *L)
3469         {
3470                 LuaPseudoRandom *o = checkobject(L, 1);
3471                 int min = 0;
3472                 int max = 32767;
3473                 lua_settop(L, 3); // Fill 2 and 3 with nil if they don't exist
3474                 if(!lua_isnil(L, 2))
3475                         min = luaL_checkinteger(L, 2);
3476                 if(!lua_isnil(L, 3))
3477                         max = luaL_checkinteger(L, 3);
3478                 if(max - min != 32767 && max - min > 32767/5)
3479                         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.");
3480                 PseudoRandom &pseudo = o->m_pseudo;
3481                 int val = pseudo.next();
3482                 val = (val % (max-min+1)) + min;
3483                 lua_pushinteger(L, val);
3484                 return 1;
3485         }
3486
3487 public:
3488         LuaPseudoRandom(int seed):
3489                 m_pseudo(seed)
3490         {
3491         }
3492
3493         ~LuaPseudoRandom()
3494         {
3495         }
3496
3497         const PseudoRandom& getItem() const
3498         {
3499                 return m_pseudo;
3500         }
3501         PseudoRandom& getItem()
3502         {
3503                 return m_pseudo;
3504         }
3505
3506         // LuaPseudoRandom(seed)
3507         // Creates an LuaPseudoRandom and leaves it on top of stack
3508         static int create_object(lua_State *L)
3509         {
3510                 int seed = luaL_checknumber(L, 1);
3511                 LuaPseudoRandom *o = new LuaPseudoRandom(seed);
3512                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
3513                 luaL_getmetatable(L, className);
3514                 lua_setmetatable(L, -2);
3515                 return 1;
3516         }
3517
3518         static LuaPseudoRandom* checkobject(lua_State *L, int narg)
3519         {
3520                 luaL_checktype(L, narg, LUA_TUSERDATA);
3521                 void *ud = luaL_checkudata(L, narg, className);
3522                 if(!ud) luaL_typerror(L, narg, className);
3523                 return *(LuaPseudoRandom**)ud;  // unbox pointer
3524         }
3525
3526         static void Register(lua_State *L)
3527         {
3528                 lua_newtable(L);
3529                 int methodtable = lua_gettop(L);
3530                 luaL_newmetatable(L, className);
3531                 int metatable = lua_gettop(L);
3532
3533                 lua_pushliteral(L, "__metatable");
3534                 lua_pushvalue(L, methodtable);
3535                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
3536
3537                 lua_pushliteral(L, "__index");
3538                 lua_pushvalue(L, methodtable);
3539                 lua_settable(L, metatable);
3540
3541                 lua_pushliteral(L, "__gc");
3542                 lua_pushcfunction(L, gc_object);
3543                 lua_settable(L, metatable);
3544
3545                 lua_pop(L, 1);  // drop metatable
3546
3547                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3548                 lua_pop(L, 1);  // drop methodtable
3549
3550                 // Can be created from Lua (LuaPseudoRandom(seed))
3551                 lua_register(L, className, create_object);
3552         }
3553 };
3554 const char LuaPseudoRandom::className[] = "PseudoRandom";
3555 const luaL_reg LuaPseudoRandom::methods[] = {
3556         method(LuaPseudoRandom, next),
3557         {0,0}
3558 };
3559
3560
3561
3562 /*
3563         LuaABM
3564 */
3565
3566 class LuaABM : public ActiveBlockModifier
3567 {
3568 private:
3569         lua_State *m_lua;
3570         int m_id;
3571
3572         std::set<std::string> m_trigger_contents;
3573         std::set<std::string> m_required_neighbors;
3574         float m_trigger_interval;
3575         u32 m_trigger_chance;
3576 public:
3577         LuaABM(lua_State *L, int id,
3578                         const std::set<std::string> &trigger_contents,
3579                         const std::set<std::string> &required_neighbors,
3580                         float trigger_interval, u32 trigger_chance):
3581                 m_lua(L),
3582                 m_id(id),
3583                 m_trigger_contents(trigger_contents),
3584                 m_required_neighbors(required_neighbors),
3585                 m_trigger_interval(trigger_interval),
3586                 m_trigger_chance(trigger_chance)
3587         {
3588         }
3589         virtual std::set<std::string> getTriggerContents()
3590         {
3591                 return m_trigger_contents;
3592         }
3593         virtual std::set<std::string> getRequiredNeighbors()
3594         {
3595                 return m_required_neighbors;
3596         }
3597         virtual float getTriggerInterval()
3598         {
3599                 return m_trigger_interval;
3600         }
3601         virtual u32 getTriggerChance()
3602         {
3603                 return m_trigger_chance;
3604         }
3605         virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n,
3606                         u32 active_object_count, u32 active_object_count_wider)
3607         {
3608                 lua_State *L = m_lua;
3609
3610                 realitycheck(L);
3611                 assert(lua_checkstack(L, 20));
3612                 StackUnroller stack_unroller(L);
3613
3614                 // Get minetest.registered_abms
3615                 lua_getglobal(L, "minetest");
3616                 lua_getfield(L, -1, "registered_abms");
3617                 luaL_checktype(L, -1, LUA_TTABLE);
3618                 int registered_abms = lua_gettop(L);
3619
3620                 // Get minetest.registered_abms[m_id]
3621                 lua_pushnumber(L, m_id);
3622                 lua_gettable(L, registered_abms);
3623                 if(lua_isnil(L, -1))
3624                         assert(0);
3625
3626                 // Call action
3627                 luaL_checktype(L, -1, LUA_TTABLE);
3628                 lua_getfield(L, -1, "action");
3629                 luaL_checktype(L, -1, LUA_TFUNCTION);
3630                 push_v3s16(L, p);
3631                 pushnode(L, n, env->getGameDef()->ndef());
3632                 lua_pushnumber(L, active_object_count);
3633                 lua_pushnumber(L, active_object_count_wider);
3634                 if(lua_pcall(L, 4, 0, 0))
3635                         script_error(L, "error: %s", lua_tostring(L, -1));
3636         }
3637 };
3638
3639 /*
3640         ServerSoundParams
3641 */
3642
3643 static void read_server_sound_params(lua_State *L, int index,
3644                 ServerSoundParams &params)
3645 {
3646         if(index < 0)
3647                 index = lua_gettop(L) + 1 + index;
3648         // Clear
3649         params = ServerSoundParams();
3650         if(lua_istable(L, index)){
3651                 getfloatfield(L, index, "gain", params.gain);
3652                 getstringfield(L, index, "to_player", params.to_player);
3653                 lua_getfield(L, index, "pos");
3654                 if(!lua_isnil(L, -1)){
3655                         v3f p = read_v3f(L, -1)*BS;
3656                         params.pos = p;
3657                         params.type = ServerSoundParams::SSP_POSITIONAL;
3658                 }
3659                 lua_pop(L, 1);
3660                 lua_getfield(L, index, "object");
3661                 if(!lua_isnil(L, -1)){
3662                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
3663                         ServerActiveObject *sao = ObjectRef::getobject(ref);
3664                         if(sao){
3665                                 params.object = sao->getId();
3666                                 params.type = ServerSoundParams::SSP_OBJECT;
3667                         }
3668                 }
3669                 lua_pop(L, 1);
3670                 params.max_hear_distance = BS*getfloatfield_default(L, index,
3671                                 "max_hear_distance", params.max_hear_distance/BS);
3672                 getboolfield(L, index, "loop", params.loop);
3673         }
3674 }
3675
3676 /*
3677         Global functions
3678 */
3679
3680 // debug(text)
3681 // Writes a line to dstream
3682 static int l_debug(lua_State *L)
3683 {
3684         std::string text = lua_tostring(L, 1);
3685         dstream << text << std::endl;
3686         return 0;
3687 }
3688
3689 // log([level,] text)
3690 // Writes a line to the logger.
3691 // The one-argument version logs to infostream.
3692 // The two-argument version accept a log level: error, action, info, or verbose.
3693 static int l_log(lua_State *L)
3694 {
3695         std::string text;
3696         LogMessageLevel level = LMT_INFO;
3697         if(lua_isnone(L, 2))
3698         {
3699                 text = lua_tostring(L, 1);
3700         }
3701         else
3702         {
3703                 std::string levelname = lua_tostring(L, 1);
3704                 text = lua_tostring(L, 2);
3705                 if(levelname == "error")
3706                         level = LMT_ERROR;
3707                 else if(levelname == "action")
3708                         level = LMT_ACTION;
3709                 else if(levelname == "verbose")
3710                         level = LMT_VERBOSE;
3711         }
3712         log_printline(level, text);
3713         return 0;
3714 }
3715
3716 // register_item_raw({lots of stuff})
3717 static int l_register_item_raw(lua_State *L)
3718 {
3719         luaL_checktype(L, 1, LUA_TTABLE);
3720         int table = 1;
3721
3722         // Get the writable item and node definition managers from the server
3723         IWritableItemDefManager *idef =
3724                         get_server(L)->getWritableItemDefManager();
3725         IWritableNodeDefManager *ndef =
3726                         get_server(L)->getWritableNodeDefManager();
3727
3728         // Check if name is defined
3729         lua_getfield(L, table, "name");
3730         if(lua_isstring(L, -1)){
3731                 std::string name = lua_tostring(L, -1);
3732                 verbosestream<<"register_item_raw: "<<name<<std::endl;
3733         } else {
3734                 throw LuaError(L, "register_item_raw: name is not defined or not a string");
3735         }
3736
3737         // Check if on_use is defined
3738
3739         // Read the item definition and register it
3740         ItemDefinition def = read_item_definition(L, table);
3741         idef->registerItem(def);
3742
3743         // Read the node definition (content features) and register it
3744         if(def.type == ITEM_NODE)
3745         {
3746                 ContentFeatures f = read_content_features(L, table);
3747                 ndef->set(f.name, f);
3748         }
3749
3750         return 0; /* number of results */
3751 }
3752
3753 // register_alias_raw(name, convert_to_name)
3754 static int l_register_alias_raw(lua_State *L)
3755 {
3756         std::string name = luaL_checkstring(L, 1);
3757         std::string convert_to = luaL_checkstring(L, 2);
3758
3759         // Get the writable item definition manager from the server
3760         IWritableItemDefManager *idef =
3761                         get_server(L)->getWritableItemDefManager();
3762
3763         idef->registerAlias(name, convert_to);
3764
3765         return 0; /* number of results */
3766 }
3767
3768 // helper for register_craft
3769 static bool read_craft_recipe_shaped(lua_State *L, int index,
3770                 int &width, std::vector<std::string> &recipe)
3771 {
3772         if(index < 0)
3773                 index = lua_gettop(L) + 1 + index;
3774
3775         if(!lua_istable(L, index))
3776                 return false;
3777
3778         lua_pushnil(L);
3779         int rowcount = 0;
3780         while(lua_next(L, index) != 0){
3781                 int colcount = 0;
3782                 // key at index -2 and value at index -1
3783                 if(!lua_istable(L, -1))
3784                         return false;
3785                 int table2 = lua_gettop(L);
3786                 lua_pushnil(L);
3787                 while(lua_next(L, table2) != 0){
3788                         // key at index -2 and value at index -1
3789                         if(!lua_isstring(L, -1))
3790                                 return false;
3791                         recipe.push_back(lua_tostring(L, -1));
3792                         // removes value, keeps key for next iteration
3793                         lua_pop(L, 1);
3794                         colcount++;
3795                 }
3796                 if(rowcount == 0){
3797                         width = colcount;
3798                 } else {
3799                         if(colcount != width)
3800                                 return false;
3801                 }
3802                 // removes value, keeps key for next iteration
3803                 lua_pop(L, 1);
3804                 rowcount++;
3805         }
3806         return width != 0;
3807 }
3808
3809 // helper for register_craft
3810 static bool read_craft_recipe_shapeless(lua_State *L, int index,
3811                 std::vector<std::string> &recipe)
3812 {
3813         if(index < 0)
3814                 index = lua_gettop(L) + 1 + index;
3815
3816         if(!lua_istable(L, index))
3817                 return false;
3818
3819         lua_pushnil(L);
3820         while(lua_next(L, index) != 0){
3821                 // key at index -2 and value at index -1
3822                 if(!lua_isstring(L, -1))
3823                         return false;
3824                 recipe.push_back(lua_tostring(L, -1));
3825                 // removes value, keeps key for next iteration
3826                 lua_pop(L, 1);
3827         }
3828         return true;
3829 }
3830
3831 // helper for register_craft
3832 static bool read_craft_replacements(lua_State *L, int index,
3833                 CraftReplacements &replacements)
3834 {
3835         if(index < 0)
3836                 index = lua_gettop(L) + 1 + index;
3837
3838         if(!lua_istable(L, index))
3839                 return false;
3840
3841         lua_pushnil(L);
3842         while(lua_next(L, index) != 0){
3843                 // key at index -2 and value at index -1
3844                 if(!lua_istable(L, -1))
3845                         return false;
3846                 lua_rawgeti(L, -1, 1);
3847                 if(!lua_isstring(L, -1))
3848                         return false;
3849                 std::string replace_from = lua_tostring(L, -1);
3850                 lua_pop(L, 1);
3851                 lua_rawgeti(L, -1, 2);
3852                 if(!lua_isstring(L, -1))
3853                         return false;
3854                 std::string replace_to = lua_tostring(L, -1);
3855                 lua_pop(L, 1);
3856                 replacements.pairs.push_back(
3857                                 std::make_pair(replace_from, replace_to));
3858                 // removes value, keeps key for next iteration
3859                 lua_pop(L, 1);
3860         }
3861         return true;
3862 }
3863 // register_craft({output=item, recipe={{item00,item10},{item01,item11}})
3864 static int l_register_craft(lua_State *L)
3865 {
3866         //infostream<<"register_craft"<<std::endl;
3867         luaL_checktype(L, 1, LUA_TTABLE);
3868         int table = 1;
3869
3870         // Get the writable craft definition manager from the server
3871         IWritableCraftDefManager *craftdef =
3872                         get_server(L)->getWritableCraftDefManager();
3873
3874         std::string type = getstringfield_default(L, table, "type", "shaped");
3875
3876         /*
3877                 CraftDefinitionShaped
3878         */
3879         if(type == "shaped"){
3880                 std::string output = getstringfield_default(L, table, "output", "");
3881                 if(output == "")
3882                         throw LuaError(L, "Crafting definition is missing an output");
3883
3884                 int width = 0;
3885                 std::vector<std::string> recipe;
3886                 lua_getfield(L, table, "recipe");
3887                 if(lua_isnil(L, -1))
3888                         throw LuaError(L, "Crafting definition is missing a recipe"
3889                                         " (output=\"" + output + "\")");
3890                 if(!read_craft_recipe_shaped(L, -1, width, recipe))
3891                         throw LuaError(L, "Invalid crafting recipe"
3892                                         " (output=\"" + output + "\")");
3893
3894                 CraftReplacements replacements;
3895                 lua_getfield(L, table, "replacements");
3896                 if(!lua_isnil(L, -1))
3897                 {
3898                         if(!read_craft_replacements(L, -1, replacements))
3899                                 throw LuaError(L, "Invalid replacements"
3900                                                 " (output=\"" + output + "\")");
3901                 }
3902
3903                 CraftDefinition *def = new CraftDefinitionShaped(
3904                                 output, width, recipe, replacements);
3905                 craftdef->registerCraft(def);
3906         }
3907         /*
3908                 CraftDefinitionShapeless
3909         */
3910         else if(type == "shapeless"){
3911                 std::string output = getstringfield_default(L, table, "output", "");
3912                 if(output == "")
3913                         throw LuaError(L, "Crafting definition (shapeless)"
3914                                         " is missing an output");
3915
3916                 std::vector<std::string> recipe;
3917                 lua_getfield(L, table, "recipe");
3918                 if(lua_isnil(L, -1))
3919                         throw LuaError(L, "Crafting definition (shapeless)"
3920                                         " is missing a recipe"
3921                                         " (output=\"" + output + "\")");
3922                 if(!read_craft_recipe_shapeless(L, -1, recipe))
3923                         throw LuaError(L, "Invalid crafting recipe"
3924                                         " (output=\"" + output + "\")");
3925
3926                 CraftReplacements replacements;
3927                 lua_getfield(L, table, "replacements");
3928                 if(!lua_isnil(L, -1))
3929                 {
3930                         if(!read_craft_replacements(L, -1, replacements))
3931                                 throw LuaError(L, "Invalid replacements"
3932                                                 " (output=\"" + output + "\")");
3933                 }
3934
3935                 CraftDefinition *def = new CraftDefinitionShapeless(
3936                                 output, recipe, replacements);
3937                 craftdef->registerCraft(def);
3938         }
3939         /*
3940                 CraftDefinitionToolRepair
3941         */
3942         else if(type == "toolrepair"){
3943                 float additional_wear = getfloatfield_default(L, table,
3944                                 "additional_wear", 0.0);
3945
3946                 CraftDefinition *def = new CraftDefinitionToolRepair(
3947                                 additional_wear);
3948                 craftdef->registerCraft(def);
3949         }
3950         /*
3951                 CraftDefinitionCooking
3952         */
3953         else if(type == "cooking"){
3954                 std::string output = getstringfield_default(L, table, "output", "");
3955                 if(output == "")
3956                         throw LuaError(L, "Crafting definition (cooking)"
3957                                         " is missing an output");
3958
3959                 std::string recipe = getstringfield_default(L, table, "recipe", "");
3960                 if(recipe == "")
3961                         throw LuaError(L, "Crafting definition (cooking)"
3962                                         " is missing a recipe"
3963                                         " (output=\"" + output + "\")");
3964
3965                 float cooktime = getfloatfield_default(L, table, "cooktime", 3.0);
3966
3967                 CraftDefinition *def = new CraftDefinitionCooking(
3968                                 output, recipe, cooktime);
3969                 craftdef->registerCraft(def);
3970         }
3971         /*
3972                 CraftDefinitionFuel
3973         */
3974         else if(type == "fuel"){
3975                 std::string recipe = getstringfield_default(L, table, "recipe", "");
3976                 if(recipe == "")
3977                         throw LuaError(L, "Crafting definition (fuel)"
3978                                         " is missing a recipe");
3979
3980                 float burntime = getfloatfield_default(L, table, "burntime", 1.0);
3981
3982                 CraftDefinition *def = new CraftDefinitionFuel(
3983                                 recipe, burntime);
3984                 craftdef->registerCraft(def);
3985         }
3986         else
3987         {
3988                 throw LuaError(L, "Unknown crafting definition type: \"" + type + "\"");
3989         }
3990
3991         lua_pop(L, 1);
3992         return 0; /* number of results */
3993 }
3994
3995 // setting_set(name, value)
3996 static int l_setting_set(lua_State *L)
3997 {
3998         const char *name = luaL_checkstring(L, 1);
3999         const char *value = luaL_checkstring(L, 2);
4000         g_settings->set(name, value);
4001         return 0;
4002 }
4003
4004 // setting_get(name)
4005 static int l_setting_get(lua_State *L)
4006 {
4007         const char *name = luaL_checkstring(L, 1);
4008         try{
4009                 std::string value = g_settings->get(name);
4010                 lua_pushstring(L, value.c_str());
4011         } catch(SettingNotFoundException &e){
4012                 lua_pushnil(L);
4013         }
4014         return 1;
4015 }
4016
4017 // setting_getbool(name)
4018 static int l_setting_getbool(lua_State *L)
4019 {
4020         const char *name = luaL_checkstring(L, 1);
4021         try{
4022                 bool value = g_settings->getBool(name);
4023                 lua_pushboolean(L, value);
4024         } catch(SettingNotFoundException &e){
4025                 lua_pushnil(L);
4026         }
4027         return 1;
4028 }
4029
4030 // chat_send_all(text)
4031 static int l_chat_send_all(lua_State *L)
4032 {
4033         const char *text = luaL_checkstring(L, 1);
4034         // Get server from registry
4035         Server *server = get_server(L);
4036         // Send
4037         server->notifyPlayers(narrow_to_wide(text));
4038         return 0;
4039 }
4040
4041 // chat_send_player(name, text)
4042 static int l_chat_send_player(lua_State *L)
4043 {
4044         const char *name = luaL_checkstring(L, 1);
4045         const char *text = luaL_checkstring(L, 2);
4046         // Get server from registry
4047         Server *server = get_server(L);
4048         // Send
4049         server->notifyPlayer(name, narrow_to_wide(text));
4050         return 0;
4051 }
4052
4053 // get_player_privs(name, text)
4054 static int l_get_player_privs(lua_State *L)
4055 {
4056         const char *name = luaL_checkstring(L, 1);
4057         // Get server from registry
4058         Server *server = get_server(L);
4059         // Do it
4060         lua_newtable(L);
4061         int table = lua_gettop(L);
4062         std::set<std::string> privs_s = server->getPlayerEffectivePrivs(name);
4063         for(std::set<std::string>::const_iterator
4064                         i = privs_s.begin(); i != privs_s.end(); i++){
4065                 lua_pushboolean(L, true);
4066                 lua_setfield(L, table, i->c_str());
4067         }
4068         lua_pushvalue(L, table);
4069         return 1;
4070 }
4071
4072 // get_inventory(location)
4073 static int l_get_inventory(lua_State *L)
4074 {
4075         InventoryLocation loc;
4076
4077         std::string type = checkstringfield(L, 1, "type");
4078         if(type == "player"){
4079                 std::string name = checkstringfield(L, 1, "name");
4080                 loc.setPlayer(name);
4081         } else if(type == "node"){
4082                 lua_getfield(L, 1, "pos");
4083                 v3s16 pos = check_v3s16(L, -1);
4084                 loc.setNodeMeta(pos);
4085         }
4086
4087         if(get_server(L)->getInventory(loc) != NULL)
4088                 InvRef::create(L, loc);
4089         else
4090                 lua_pushnil(L);
4091         return 1;
4092 }
4093
4094 // get_dig_params(groups, tool_capabilities[, time_from_last_punch])
4095 static int l_get_dig_params(lua_State *L)
4096 {
4097         std::map<std::string, int> groups;
4098         read_groups(L, 1, groups);
4099         ToolCapabilities tp = read_tool_capabilities(L, 2);
4100         if(lua_isnoneornil(L, 3))
4101                 push_dig_params(L, getDigParams(groups, &tp));
4102         else
4103                 push_dig_params(L, getDigParams(groups, &tp,
4104                                         luaL_checknumber(L, 3)));
4105         return 1;
4106 }
4107
4108 // get_hit_params(groups, tool_capabilities[, time_from_last_punch])
4109 static int l_get_hit_params(lua_State *L)
4110 {
4111         std::map<std::string, int> groups;
4112         read_groups(L, 1, groups);
4113         ToolCapabilities tp = read_tool_capabilities(L, 2);
4114         if(lua_isnoneornil(L, 3))
4115                 push_hit_params(L, getHitParams(groups, &tp));
4116         else
4117                 push_hit_params(L, getHitParams(groups, &tp,
4118                                         luaL_checknumber(L, 3)));
4119         return 1;
4120 }
4121
4122 // get_current_modname()
4123 static int l_get_current_modname(lua_State *L)
4124 {
4125         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
4126         return 1;
4127 }
4128
4129 // get_modpath(modname)
4130 static int l_get_modpath(lua_State *L)
4131 {
4132         std::string modname = luaL_checkstring(L, 1);
4133         // Do it
4134         if(modname == "__builtin"){
4135                 std::string path = get_server(L)->getBuiltinLuaPath();
4136                 lua_pushstring(L, path.c_str());
4137                 return 1;
4138         }
4139         const ModSpec *mod = get_server(L)->getModSpec(modname);
4140         if(!mod){
4141                 lua_pushnil(L);
4142                 return 1;
4143         }
4144         lua_pushstring(L, mod->path.c_str());
4145         return 1;
4146 }
4147
4148 // get_worldpath()
4149 static int l_get_worldpath(lua_State *L)
4150 {
4151         std::string worldpath = get_server(L)->getWorldPath();
4152         lua_pushstring(L, worldpath.c_str());
4153         return 1;
4154 }
4155
4156 // sound_play(spec, parameters)
4157 static int l_sound_play(lua_State *L)
4158 {
4159         SimpleSoundSpec spec;
4160         read_soundspec(L, 1, spec);
4161         ServerSoundParams params;
4162         read_server_sound_params(L, 2, params);
4163         s32 handle = get_server(L)->playSound(spec, params);
4164         lua_pushinteger(L, handle);
4165         return 1;
4166 }
4167
4168 // sound_stop(handle)
4169 static int l_sound_stop(lua_State *L)
4170 {
4171         int handle = luaL_checkinteger(L, 1);
4172         get_server(L)->stopSound(handle);
4173         return 0;
4174 }
4175
4176 // is_singleplayer()
4177 static int l_is_singleplayer(lua_State *L)
4178 {
4179         lua_pushboolean(L, get_server(L)->isSingleplayer());
4180         return 1;
4181 }
4182
4183 // get_password_hash(name, raw_password)
4184 static int l_get_password_hash(lua_State *L)
4185 {
4186         std::string name = luaL_checkstring(L, 1);
4187         std::string raw_password = luaL_checkstring(L, 2);
4188         std::string hash = translatePassword(name,
4189                         narrow_to_wide(raw_password));
4190         lua_pushstring(L, hash.c_str());
4191         return 1;
4192 }
4193
4194 // notify_authentication_modified(name)
4195 static int l_notify_authentication_modified(lua_State *L)
4196 {
4197         std::string name = "";
4198         if(lua_isstring(L, 1))
4199                 name = lua_tostring(L, 1);
4200         get_server(L)->reportPrivsModified(name);
4201         return 0;
4202 }
4203
4204 static const struct luaL_Reg minetest_f [] = {
4205         {"debug", l_debug},
4206         {"log", l_log},
4207         {"register_item_raw", l_register_item_raw},
4208         {"register_alias_raw", l_register_alias_raw},
4209         {"register_craft", l_register_craft},
4210         {"setting_set", l_setting_set},
4211         {"setting_get", l_setting_get},
4212         {"setting_getbool", l_setting_getbool},
4213         {"chat_send_all", l_chat_send_all},
4214         {"chat_send_player", l_chat_send_player},
4215         {"get_player_privs", l_get_player_privs},
4216         {"get_inventory", l_get_inventory},
4217         {"get_dig_params", l_get_dig_params},
4218         {"get_hit_params", l_get_hit_params},
4219         {"get_current_modname", l_get_current_modname},
4220         {"get_modpath", l_get_modpath},
4221         {"get_worldpath", l_get_worldpath},
4222         {"sound_play", l_sound_play},
4223         {"sound_stop", l_sound_stop},
4224         {"is_singleplayer", l_is_singleplayer},
4225         {"get_password_hash", l_get_password_hash},
4226         {"notify_authentication_modified", l_notify_authentication_modified},
4227         {NULL, NULL}
4228 };
4229
4230 /*
4231         Main export function
4232 */
4233
4234 void scriptapi_export(lua_State *L, Server *server)
4235 {
4236         realitycheck(L);
4237         assert(lua_checkstack(L, 20));
4238         verbosestream<<"scriptapi_export()"<<std::endl;
4239         StackUnroller stack_unroller(L);
4240
4241         // Store server as light userdata in registry
4242         lua_pushlightuserdata(L, server);
4243         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_server");
4244
4245         // Register global functions in table minetest
4246         lua_newtable(L);
4247         luaL_register(L, NULL, minetest_f);
4248         lua_setglobal(L, "minetest");
4249
4250         // Get the main minetest table
4251         lua_getglobal(L, "minetest");
4252
4253         // Add tables to minetest
4254
4255         lua_newtable(L);
4256         lua_setfield(L, -2, "object_refs");
4257         lua_newtable(L);
4258         lua_setfield(L, -2, "luaentities");
4259
4260         // Register wrappers
4261         LuaItemStack::Register(L);
4262         InvRef::Register(L);
4263         NodeMetaRef::Register(L);
4264         ObjectRef::Register(L);
4265         EnvRef::Register(L);
4266         LuaPseudoRandom::Register(L);
4267         LuaPerlinNoise::Register(L);
4268 }
4269
4270 bool scriptapi_loadmod(lua_State *L, const std::string &scriptpath,
4271                 const std::string &modname)
4272 {
4273         ModNameStorer modnamestorer(L, modname);
4274
4275         if(!string_allowed(modname, "abcdefghijklmnopqrstuvwxyz"
4276                         "0123456789_")){
4277                 errorstream<<"Error loading mod \""<<modname
4278                                 <<"\": modname does not follow naming conventions: "
4279                                 <<"Only chararacters [a-z0-9_] are allowed."<<std::endl;
4280                 return false;
4281         }
4282
4283         bool success = false;
4284
4285         try{
4286                 success = script_load(L, scriptpath.c_str());
4287         }
4288         catch(LuaError &e){
4289                 errorstream<<"Error loading mod \""<<modname
4290                                 <<"\": "<<e.what()<<std::endl;
4291         }
4292
4293         return success;
4294 }
4295
4296 void scriptapi_add_environment(lua_State *L, ServerEnvironment *env)
4297 {
4298         realitycheck(L);
4299         assert(lua_checkstack(L, 20));
4300         verbosestream<<"scriptapi_add_environment"<<std::endl;
4301         StackUnroller stack_unroller(L);
4302
4303         // Create EnvRef on stack
4304         EnvRef::create(L, env);
4305         int envref = lua_gettop(L);
4306
4307         // minetest.env = envref
4308         lua_getglobal(L, "minetest");
4309         luaL_checktype(L, -1, LUA_TTABLE);
4310         lua_pushvalue(L, envref);
4311         lua_setfield(L, -2, "env");
4312
4313         // Store environment as light userdata in registry
4314         lua_pushlightuserdata(L, env);
4315         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_env");
4316
4317         /*
4318                 Add ActiveBlockModifiers to environment
4319         */
4320
4321         // Get minetest.registered_abms
4322         lua_getglobal(L, "minetest");
4323         lua_getfield(L, -1, "registered_abms");
4324         luaL_checktype(L, -1, LUA_TTABLE);
4325         int registered_abms = lua_gettop(L);
4326
4327         if(lua_istable(L, registered_abms)){
4328                 int table = lua_gettop(L);
4329                 lua_pushnil(L);
4330                 while(lua_next(L, table) != 0){
4331                         // key at index -2 and value at index -1
4332                         int id = lua_tonumber(L, -2);
4333                         int current_abm = lua_gettop(L);
4334
4335                         std::set<std::string> trigger_contents;
4336                         lua_getfield(L, current_abm, "nodenames");
4337                         if(lua_istable(L, -1)){
4338                                 int table = lua_gettop(L);
4339                                 lua_pushnil(L);
4340                                 while(lua_next(L, table) != 0){
4341                                         // key at index -2 and value at index -1
4342                                         luaL_checktype(L, -1, LUA_TSTRING);
4343                                         trigger_contents.insert(lua_tostring(L, -1));
4344                                         // removes value, keeps key for next iteration
4345                                         lua_pop(L, 1);
4346                                 }
4347                         } else if(lua_isstring(L, -1)){
4348                                 trigger_contents.insert(lua_tostring(L, -1));
4349                         }
4350                         lua_pop(L, 1);
4351
4352                         std::set<std::string> required_neighbors;
4353                         lua_getfield(L, current_abm, "neighbors");
4354                         if(lua_istable(L, -1)){
4355                                 int table = lua_gettop(L);
4356                                 lua_pushnil(L);
4357                                 while(lua_next(L, table) != 0){
4358                                         // key at index -2 and value at index -1
4359                                         luaL_checktype(L, -1, LUA_TSTRING);
4360                                         required_neighbors.insert(lua_tostring(L, -1));
4361                                         // removes value, keeps key for next iteration
4362                                         lua_pop(L, 1);
4363                                 }
4364                         } else if(lua_isstring(L, -1)){
4365                                 required_neighbors.insert(lua_tostring(L, -1));
4366                         }
4367                         lua_pop(L, 1);
4368
4369                         float trigger_interval = 10.0;
4370                         getfloatfield(L, current_abm, "interval", trigger_interval);
4371
4372                         int trigger_chance = 50;
4373                         getintfield(L, current_abm, "chance", trigger_chance);
4374
4375                         LuaABM *abm = new LuaABM(L, id, trigger_contents,
4376                                         required_neighbors, trigger_interval, trigger_chance);
4377
4378                         env->addActiveBlockModifier(abm);
4379
4380                         // removes value, keeps key for next iteration
4381                         lua_pop(L, 1);
4382                 }
4383         }
4384         lua_pop(L, 1);
4385 }
4386
4387 #if 0
4388 // Dump stack top with the dump2 function
4389 static void dump2(lua_State *L, const char *name)
4390 {
4391         // Dump object (debug)
4392         lua_getglobal(L, "dump2");
4393         luaL_checktype(L, -1, LUA_TFUNCTION);
4394         lua_pushvalue(L, -2); // Get previous stack top as first parameter
4395         lua_pushstring(L, name);
4396         if(lua_pcall(L, 2, 0, 0))
4397                 script_error(L, "error: %s", lua_tostring(L, -1));
4398 }
4399 #endif
4400
4401 /*
4402         object_reference
4403 */
4404
4405 void scriptapi_add_object_reference(lua_State *L, ServerActiveObject *cobj)
4406 {
4407         realitycheck(L);
4408         assert(lua_checkstack(L, 20));
4409         //infostream<<"scriptapi_add_object_reference: id="<<cobj->getId()<<std::endl;
4410         StackUnroller stack_unroller(L);
4411
4412         // Create object on stack
4413         ObjectRef::create(L, cobj); // Puts ObjectRef (as userdata) on stack
4414         int object = lua_gettop(L);
4415
4416         // Get minetest.object_refs table
4417         lua_getglobal(L, "minetest");
4418         lua_getfield(L, -1, "object_refs");
4419         luaL_checktype(L, -1, LUA_TTABLE);
4420         int objectstable = lua_gettop(L);
4421
4422         // object_refs[id] = object
4423         lua_pushnumber(L, cobj->getId()); // Push id
4424         lua_pushvalue(L, object); // Copy object to top of stack
4425         lua_settable(L, objectstable);
4426 }
4427
4428 void scriptapi_rm_object_reference(lua_State *L, ServerActiveObject *cobj)
4429 {
4430         realitycheck(L);
4431         assert(lua_checkstack(L, 20));
4432         //infostream<<"scriptapi_rm_object_reference: id="<<cobj->getId()<<std::endl;
4433         StackUnroller stack_unroller(L);
4434
4435         // Get minetest.object_refs table
4436         lua_getglobal(L, "minetest");
4437         lua_getfield(L, -1, "object_refs");
4438         luaL_checktype(L, -1, LUA_TTABLE);
4439         int objectstable = lua_gettop(L);
4440
4441         // Get object_refs[id]
4442         lua_pushnumber(L, cobj->getId()); // Push id
4443         lua_gettable(L, objectstable);
4444         // Set object reference to NULL
4445         ObjectRef::set_null(L);
4446         lua_pop(L, 1); // pop object
4447
4448         // Set object_refs[id] = nil
4449         lua_pushnumber(L, cobj->getId()); // Push id
4450         lua_pushnil(L);
4451         lua_settable(L, objectstable);
4452 }
4453
4454 /*
4455         misc
4456 */
4457
4458 // What scriptapi_run_callbacks does with the return values of callbacks.
4459 // Regardless of the mode, if only one callback is defined,
4460 // its return value is the total return value.
4461 // Modes only affect the case where 0 or >= 2 callbacks are defined.
4462 enum RunCallbacksMode
4463 {
4464         // Returns the return value of the first callback
4465         // Returns nil if list of callbacks is empty
4466         RUN_CALLBACKS_MODE_FIRST,
4467         // Returns the return value of the last callback
4468         // Returns nil if list of callbacks is empty
4469         RUN_CALLBACKS_MODE_LAST,
4470         // If any callback returns a false value, the first such is returned
4471         // Otherwise, the first callback's return value (trueish) is returned
4472         // Returns true if list of callbacks is empty
4473         RUN_CALLBACKS_MODE_AND,
4474         // Like above, but stops calling callbacks (short circuit)
4475         // after seeing the first false value
4476         RUN_CALLBACKS_MODE_AND_SC,
4477         // If any callback returns a true value, the first such is returned
4478         // Otherwise, the first callback's return value (falseish) is returned
4479         // Returns false if list of callbacks is empty
4480         RUN_CALLBACKS_MODE_OR,
4481         // Like above, but stops calling callbacks (short circuit)
4482         // after seeing the first true value
4483         RUN_CALLBACKS_MODE_OR_SC,
4484         // Note: "a true value" and "a false value" refer to values that
4485         // are converted by lua_toboolean to true or false, respectively.
4486 };
4487
4488 // Push the list of callbacks (a lua table).
4489 // Then push nargs arguments.
4490 // Then call this function, which
4491 // - runs the callbacks
4492 // - removes the table and arguments from the lua stack
4493 // - pushes the return value, computed depending on mode
4494 static void scriptapi_run_callbacks(lua_State *L, int nargs,
4495                 RunCallbacksMode mode)
4496 {
4497         // Insert the return value into the lua stack, below the table
4498         assert(lua_gettop(L) >= nargs + 1);
4499         lua_pushnil(L);
4500         lua_insert(L, -(nargs + 1) - 1);
4501         // Stack now looks like this:
4502         // ... <return value = nil> <table> <arg#1> <arg#2> ... <arg#n>
4503
4504         int rv = lua_gettop(L) - nargs - 1;
4505         int table = rv + 1;
4506         int arg = table + 1;
4507
4508         luaL_checktype(L, table, LUA_TTABLE);
4509
4510         // Foreach
4511         lua_pushnil(L);
4512         bool first_loop = true;
4513         while(lua_next(L, table) != 0){
4514                 // key at index -2 and value at index -1
4515                 luaL_checktype(L, -1, LUA_TFUNCTION);
4516                 // Call function
4517                 for(int i = 0; i < nargs; i++)
4518                         lua_pushvalue(L, arg+i);
4519                 if(lua_pcall(L, nargs, 1, 0))
4520                         script_error(L, "error: %s", lua_tostring(L, -1));
4521
4522                 // Move return value to designated space in stack
4523                 // Or pop it
4524                 if(first_loop){
4525                         // Result of first callback is always moved
4526                         lua_replace(L, rv);
4527                         first_loop = false;
4528                 } else {
4529                         // Otherwise, what happens depends on the mode
4530                         if(mode == RUN_CALLBACKS_MODE_FIRST)
4531                                 lua_pop(L, 1);
4532                         else if(mode == RUN_CALLBACKS_MODE_LAST)
4533                                 lua_replace(L, rv);
4534                         else if(mode == RUN_CALLBACKS_MODE_AND ||
4535                                         mode == RUN_CALLBACKS_MODE_AND_SC){
4536                                 if(lua_toboolean(L, rv) == true &&
4537                                                 lua_toboolean(L, -1) == false)
4538                                         lua_replace(L, rv);
4539                                 else
4540                                         lua_pop(L, 1);
4541                         }
4542                         else if(mode == RUN_CALLBACKS_MODE_OR ||
4543                                         mode == RUN_CALLBACKS_MODE_OR_SC){
4544                                 if(lua_toboolean(L, rv) == false &&
4545                                                 lua_toboolean(L, -1) == true)
4546                                         lua_replace(L, rv);
4547                                 else
4548                                         lua_pop(L, 1);
4549                         }
4550                         else
4551                                 assert(0);
4552                 }
4553
4554                 // Handle short circuit modes
4555                 if(mode == RUN_CALLBACKS_MODE_AND_SC &&
4556                                 lua_toboolean(L, rv) == false)
4557                         break;
4558                 else if(mode == RUN_CALLBACKS_MODE_OR_SC &&
4559                                 lua_toboolean(L, rv) == true)
4560                         break;
4561
4562                 // value removed, keep key for next iteration
4563         }
4564
4565         // Remove stuff from stack, leaving only the return value
4566         lua_settop(L, rv);
4567
4568         // Fix return value in case no callbacks were called
4569         if(first_loop){
4570                 if(mode == RUN_CALLBACKS_MODE_AND ||
4571                                 mode == RUN_CALLBACKS_MODE_AND_SC){
4572                         lua_pop(L, 1);
4573                         lua_pushboolean(L, true);
4574                 }
4575                 else if(mode == RUN_CALLBACKS_MODE_OR ||
4576                                 mode == RUN_CALLBACKS_MODE_OR_SC){
4577                         lua_pop(L, 1);
4578                         lua_pushboolean(L, false);
4579                 }
4580         }
4581 }
4582
4583 bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
4584                 const std::string &message)
4585 {
4586         realitycheck(L);
4587         assert(lua_checkstack(L, 20));
4588         StackUnroller stack_unroller(L);
4589
4590         // Get minetest.registered_on_chat_messages
4591         lua_getglobal(L, "minetest");
4592         lua_getfield(L, -1, "registered_on_chat_messages");
4593         // Call callbacks
4594         lua_pushstring(L, name.c_str());
4595         lua_pushstring(L, message.c_str());
4596         scriptapi_run_callbacks(L, 2, RUN_CALLBACKS_MODE_OR_SC);
4597         bool ate = lua_toboolean(L, -1);
4598         return ate;
4599 }
4600
4601 void scriptapi_on_newplayer(lua_State *L, ServerActiveObject *player)
4602 {
4603         realitycheck(L);
4604         assert(lua_checkstack(L, 20));
4605         StackUnroller stack_unroller(L);
4606
4607         // Get minetest.registered_on_newplayers
4608         lua_getglobal(L, "minetest");
4609         lua_getfield(L, -1, "registered_on_newplayers");
4610         // Call callbacks
4611         objectref_get_or_create(L, player);
4612         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4613 }
4614
4615 void scriptapi_on_dieplayer(lua_State *L, ServerActiveObject *player)
4616 {
4617         realitycheck(L);
4618         assert(lua_checkstack(L, 20));
4619         StackUnroller stack_unroller(L);
4620
4621         // Get minetest.registered_on_dieplayers
4622         lua_getglobal(L, "minetest");
4623         lua_getfield(L, -1, "registered_on_dieplayers");
4624         // Call callbacks
4625         objectref_get_or_create(L, player);
4626         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4627 }
4628
4629 bool scriptapi_on_respawnplayer(lua_State *L, ServerActiveObject *player)
4630 {
4631         realitycheck(L);
4632         assert(lua_checkstack(L, 20));
4633         StackUnroller stack_unroller(L);
4634
4635         // Get minetest.registered_on_respawnplayers
4636         lua_getglobal(L, "minetest");
4637         lua_getfield(L, -1, "registered_on_respawnplayers");
4638         // Call callbacks
4639         objectref_get_or_create(L, player);
4640         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_OR);
4641         bool positioning_handled_by_some = lua_toboolean(L, -1);
4642         return positioning_handled_by_some;
4643 }
4644
4645 void scriptapi_on_joinplayer(lua_State *L, ServerActiveObject *player)
4646 {
4647         realitycheck(L);
4648         assert(lua_checkstack(L, 20));
4649         StackUnroller stack_unroller(L);
4650
4651         // Get minetest.registered_on_joinplayers
4652         lua_getglobal(L, "minetest");
4653         lua_getfield(L, -1, "registered_on_joinplayers");
4654         // Call callbacks
4655         objectref_get_or_create(L, player);
4656         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4657 }
4658
4659 void scriptapi_on_leaveplayer(lua_State *L, ServerActiveObject *player)
4660 {
4661         realitycheck(L);
4662         assert(lua_checkstack(L, 20));
4663         StackUnroller stack_unroller(L);
4664
4665         // Get minetest.registered_on_leaveplayers
4666         lua_getglobal(L, "minetest");
4667         lua_getfield(L, -1, "registered_on_leaveplayers");
4668         // Call callbacks
4669         objectref_get_or_create(L, player);
4670         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4671 }
4672
4673 void scriptapi_get_creative_inventory(lua_State *L, ServerActiveObject *player)
4674 {
4675         realitycheck(L);
4676         assert(lua_checkstack(L, 20));
4677         StackUnroller stack_unroller(L);
4678
4679         Inventory *inv = player->getInventory();
4680         assert(inv);
4681
4682         lua_getglobal(L, "minetest");
4683         lua_getfield(L, -1, "creative_inventory");
4684         luaL_checktype(L, -1, LUA_TTABLE);
4685         inventory_set_list_from_lua(inv, "main", L, -1, PLAYER_INVENTORY_SIZE);
4686 }
4687
4688 static void get_auth_handler(lua_State *L)
4689 {
4690         lua_getglobal(L, "minetest");
4691         lua_getfield(L, -1, "registered_auth_handler");
4692         if(lua_isnil(L, -1)){
4693                 lua_pop(L, 1);
4694                 lua_getfield(L, -1, "builtin_auth_handler");
4695         }
4696         if(lua_type(L, -1) != LUA_TTABLE)
4697                 throw LuaError(L, "Authentication handler table not valid");
4698 }
4699
4700 bool scriptapi_get_auth(lua_State *L, const std::string &playername,
4701                 std::string *dst_password, std::set<std::string> *dst_privs)
4702 {
4703         realitycheck(L);
4704         assert(lua_checkstack(L, 20));
4705         StackUnroller stack_unroller(L);
4706
4707         get_auth_handler(L);
4708         lua_getfield(L, -1, "get_auth");
4709         if(lua_type(L, -1) != LUA_TFUNCTION)
4710                 throw LuaError(L, "Authentication handler missing get_auth");
4711         lua_pushstring(L, playername.c_str());
4712         if(lua_pcall(L, 1, 1, 0))
4713                 script_error(L, "error: %s", lua_tostring(L, -1));
4714
4715         // nil = login not allowed
4716         if(lua_isnil(L, -1))
4717                 return false;
4718         luaL_checktype(L, -1, LUA_TTABLE);
4719
4720         std::string password;
4721         bool found = getstringfield(L, -1, "password", password);
4722         if(!found)
4723                 throw LuaError(L, "Authentication handler didn't return password");
4724         if(dst_password)
4725                 *dst_password = password;
4726
4727         lua_getfield(L, -1, "privileges");
4728         if(!lua_istable(L, -1))
4729                 throw LuaError(L,
4730                                 "Authentication handler didn't return privilege table");
4731         if(dst_privs)
4732                 read_privileges(L, -1, *dst_privs);
4733         lua_pop(L, 1);
4734
4735         return true;
4736 }
4737
4738 void scriptapi_create_auth(lua_State *L, const std::string &playername,
4739                 const std::string &password)
4740 {
4741         realitycheck(L);
4742         assert(lua_checkstack(L, 20));
4743         StackUnroller stack_unroller(L);
4744
4745         get_auth_handler(L);
4746         lua_getfield(L, -1, "create_auth");
4747         if(lua_type(L, -1) != LUA_TFUNCTION)
4748                 throw LuaError(L, "Authentication handler missing create_auth");
4749         lua_pushstring(L, playername.c_str());
4750         lua_pushstring(L, password.c_str());
4751         if(lua_pcall(L, 2, 0, 0))
4752                 script_error(L, "error: %s", lua_tostring(L, -1));
4753 }
4754
4755 bool scriptapi_set_password(lua_State *L, const std::string &playername,
4756                 const std::string &password)
4757 {
4758         realitycheck(L);
4759         assert(lua_checkstack(L, 20));
4760         StackUnroller stack_unroller(L);
4761
4762         get_auth_handler(L);
4763         lua_getfield(L, -1, "set_password");
4764         if(lua_type(L, -1) != LUA_TFUNCTION)
4765                 throw LuaError(L, "Authentication handler missing set_password");
4766         lua_pushstring(L, playername.c_str());
4767         lua_pushstring(L, password.c_str());
4768         if(lua_pcall(L, 2, 1, 0))
4769                 script_error(L, "error: %s", lua_tostring(L, -1));
4770         return lua_toboolean(L, -1);
4771 }
4772
4773 /*
4774         item callbacks and node callbacks
4775 */
4776
4777 // Retrieves minetest.registered_items[name][callbackname]
4778 // If that is nil or on error, return false and stack is unchanged
4779 // If that is a function, returns true and pushes the
4780 // function onto the stack
4781 static bool get_item_callback(lua_State *L,
4782                 const char *name, const char *callbackname)
4783 {
4784         lua_getglobal(L, "minetest");
4785         lua_getfield(L, -1, "registered_items");
4786         lua_remove(L, -2);
4787         luaL_checktype(L, -1, LUA_TTABLE);
4788         lua_getfield(L, -1, name);
4789         lua_remove(L, -2);
4790         // Should be a table
4791         if(lua_type(L, -1) != LUA_TTABLE)
4792         {
4793                 errorstream<<"Item \""<<name<<"\" not defined"<<std::endl;
4794                 lua_pop(L, 1);
4795                 return false;
4796         }
4797         lua_getfield(L, -1, callbackname);
4798         lua_remove(L, -2);
4799         // Should be a function or nil
4800         if(lua_type(L, -1) == LUA_TFUNCTION)
4801         {
4802                 return true;
4803         }
4804         else if(lua_isnil(L, -1))
4805         {
4806                 lua_pop(L, 1);
4807                 return false;
4808         }
4809         else
4810         {
4811                 errorstream<<"Item \""<<name<<"\" callback \""
4812                         <<callbackname<<" is not a function"<<std::endl;
4813                 lua_pop(L, 1);
4814                 return false;
4815         }
4816 }
4817
4818 bool scriptapi_item_on_drop(lua_State *L, ItemStack &item,
4819                 ServerActiveObject *dropper, v3f pos)
4820 {
4821         realitycheck(L);
4822         assert(lua_checkstack(L, 20));
4823         StackUnroller stack_unroller(L);
4824
4825         // Push callback function on stack
4826         if(!get_item_callback(L, item.name.c_str(), "on_drop"))
4827                 return false;
4828
4829         // Call function
4830         LuaItemStack::create(L, item);
4831         objectref_get_or_create(L, dropper);
4832         pushFloatPos(L, pos);
4833         if(lua_pcall(L, 3, 1, 0))
4834                 script_error(L, "error: %s", lua_tostring(L, -1));
4835         if(!lua_isnil(L, -1))
4836                 item = read_item(L, -1);
4837         return true;
4838 }
4839
4840 bool scriptapi_item_on_place(lua_State *L, ItemStack &item,
4841                 ServerActiveObject *placer, const PointedThing &pointed)
4842 {
4843         realitycheck(L);
4844         assert(lua_checkstack(L, 20));
4845         StackUnroller stack_unroller(L);
4846
4847         // Push callback function on stack
4848         if(!get_item_callback(L, item.name.c_str(), "on_place"))
4849                 return false;
4850
4851         // Call function
4852         LuaItemStack::create(L, item);
4853         objectref_get_or_create(L, placer);
4854         push_pointed_thing(L, pointed);
4855         if(lua_pcall(L, 3, 1, 0))
4856                 script_error(L, "error: %s", lua_tostring(L, -1));
4857         if(!lua_isnil(L, -1))
4858                 item = read_item(L, -1);
4859         return true;
4860 }
4861
4862 bool scriptapi_item_on_use(lua_State *L, ItemStack &item,
4863                 ServerActiveObject *user, const PointedThing &pointed)
4864 {
4865         realitycheck(L);
4866         assert(lua_checkstack(L, 20));
4867         StackUnroller stack_unroller(L);
4868
4869         // Push callback function on stack
4870         if(!get_item_callback(L, item.name.c_str(), "on_use"))
4871                 return false;
4872
4873         // Call function
4874         LuaItemStack::create(L, item);
4875         objectref_get_or_create(L, user);
4876         push_pointed_thing(L, pointed);
4877         if(lua_pcall(L, 3, 1, 0))
4878                 script_error(L, "error: %s", lua_tostring(L, -1));
4879         if(!lua_isnil(L, -1))
4880                 item = read_item(L, -1);
4881         return true;
4882 }
4883
4884 bool scriptapi_node_on_punch(lua_State *L, v3s16 pos, MapNode node,
4885                 ServerActiveObject *puncher)
4886 {
4887         realitycheck(L);
4888         assert(lua_checkstack(L, 20));
4889         StackUnroller stack_unroller(L);
4890
4891         INodeDefManager *ndef = get_server(L)->ndef();
4892
4893         // Push callback function on stack
4894         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_punch"))
4895                 return false;
4896
4897         // Call function
4898         push_v3s16(L, pos);
4899         pushnode(L, node, ndef);
4900         objectref_get_or_create(L, puncher);
4901         if(lua_pcall(L, 3, 0, 0))
4902                 script_error(L, "error: %s", lua_tostring(L, -1));
4903         return true;
4904 }
4905
4906 bool scriptapi_node_on_dig(lua_State *L, v3s16 pos, MapNode node,
4907                 ServerActiveObject *digger)
4908 {
4909         realitycheck(L);
4910         assert(lua_checkstack(L, 20));
4911         StackUnroller stack_unroller(L);
4912
4913         INodeDefManager *ndef = get_server(L)->ndef();
4914
4915         // Push callback function on stack
4916         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_dig"))
4917                 return false;
4918
4919         // Call function
4920         push_v3s16(L, pos);
4921         pushnode(L, node, ndef);
4922         objectref_get_or_create(L, digger);
4923         if(lua_pcall(L, 3, 0, 0))
4924                 script_error(L, "error: %s", lua_tostring(L, -1));
4925         return true;
4926 }
4927
4928 /*
4929         environment
4930 */
4931
4932 void scriptapi_environment_step(lua_State *L, float dtime)
4933 {
4934         realitycheck(L);
4935         assert(lua_checkstack(L, 20));
4936         //infostream<<"scriptapi_environment_step"<<std::endl;
4937         StackUnroller stack_unroller(L);
4938
4939         // Get minetest.registered_globalsteps
4940         lua_getglobal(L, "minetest");
4941         lua_getfield(L, -1, "registered_globalsteps");
4942         // Call callbacks
4943         lua_pushnumber(L, dtime);
4944         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4945 }
4946
4947 void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp,
4948                 u32 blockseed)
4949 {
4950         realitycheck(L);
4951         assert(lua_checkstack(L, 20));
4952         //infostream<<"scriptapi_environment_on_generated"<<std::endl;
4953         StackUnroller stack_unroller(L);
4954
4955         // Get minetest.registered_on_generateds
4956         lua_getglobal(L, "minetest");
4957         lua_getfield(L, -1, "registered_on_generateds");
4958         // Call callbacks
4959         push_v3s16(L, minp);
4960         push_v3s16(L, maxp);
4961         lua_pushnumber(L, blockseed);
4962         scriptapi_run_callbacks(L, 3, RUN_CALLBACKS_MODE_FIRST);
4963 }
4964
4965 /*
4966         luaentity
4967 */
4968
4969 bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name)
4970 {
4971         realitycheck(L);
4972         assert(lua_checkstack(L, 20));
4973         verbosestream<<"scriptapi_luaentity_add: id="<<id<<" name=\""
4974                         <<name<<"\""<<std::endl;
4975         StackUnroller stack_unroller(L);
4976
4977         // Get minetest.registered_entities[name]
4978         lua_getglobal(L, "minetest");
4979         lua_getfield(L, -1, "registered_entities");
4980         luaL_checktype(L, -1, LUA_TTABLE);
4981         lua_pushstring(L, name);
4982         lua_gettable(L, -2);
4983         // Should be a table, which we will use as a prototype
4984         //luaL_checktype(L, -1, LUA_TTABLE);
4985         if(lua_type(L, -1) != LUA_TTABLE){
4986                 errorstream<<"LuaEntity name \""<<name<<"\" not defined"<<std::endl;
4987                 return false;
4988         }
4989         int prototype_table = lua_gettop(L);
4990         //dump2(L, "prototype_table");
4991
4992         // Create entity object
4993         lua_newtable(L);
4994         int object = lua_gettop(L);
4995
4996         // Set object metatable
4997         lua_pushvalue(L, prototype_table);
4998         lua_setmetatable(L, -2);
4999
5000         // Add object reference
5001         // This should be userdata with metatable ObjectRef
5002         objectref_get(L, id);
5003         luaL_checktype(L, -1, LUA_TUSERDATA);
5004         if(!luaL_checkudata(L, -1, "ObjectRef"))
5005                 luaL_typerror(L, -1, "ObjectRef");
5006         lua_setfield(L, -2, "object");
5007
5008         // minetest.luaentities[id] = object
5009         lua_getglobal(L, "minetest");
5010         lua_getfield(L, -1, "luaentities");
5011         luaL_checktype(L, -1, LUA_TTABLE);
5012         lua_pushnumber(L, id); // Push id
5013         lua_pushvalue(L, object); // Copy object to top of stack
5014         lua_settable(L, -3);
5015
5016         return true;
5017 }
5018
5019 void scriptapi_luaentity_activate(lua_State *L, u16 id,
5020                 const std::string &staticdata)
5021 {
5022         realitycheck(L);
5023         assert(lua_checkstack(L, 20));
5024         verbosestream<<"scriptapi_luaentity_activate: id="<<id<<std::endl;
5025         StackUnroller stack_unroller(L);
5026
5027         // Get minetest.luaentities[id]
5028         luaentity_get(L, id);
5029         int object = lua_gettop(L);
5030
5031         // Get on_activate function
5032         lua_pushvalue(L, object);
5033         lua_getfield(L, -1, "on_activate");
5034         if(!lua_isnil(L, -1)){
5035                 luaL_checktype(L, -1, LUA_TFUNCTION);
5036                 lua_pushvalue(L, object); // self
5037                 lua_pushlstring(L, staticdata.c_str(), staticdata.size());
5038                 // Call with 2 arguments, 0 results
5039                 if(lua_pcall(L, 2, 0, 0))
5040                         script_error(L, "error running function on_activate: %s\n",
5041                                         lua_tostring(L, -1));
5042         }
5043 }
5044
5045 void scriptapi_luaentity_rm(lua_State *L, u16 id)
5046 {
5047         realitycheck(L);
5048         assert(lua_checkstack(L, 20));
5049         verbosestream<<"scriptapi_luaentity_rm: id="<<id<<std::endl;
5050
5051         // Get minetest.luaentities table
5052         lua_getglobal(L, "minetest");
5053         lua_getfield(L, -1, "luaentities");
5054         luaL_checktype(L, -1, LUA_TTABLE);
5055         int objectstable = lua_gettop(L);
5056
5057         // Set luaentities[id] = nil
5058         lua_pushnumber(L, id); // Push id
5059         lua_pushnil(L);
5060         lua_settable(L, objectstable);
5061
5062         lua_pop(L, 2); // pop luaentities, minetest
5063 }
5064
5065 std::string scriptapi_luaentity_get_staticdata(lua_State *L, u16 id)
5066 {
5067         realitycheck(L);
5068         assert(lua_checkstack(L, 20));
5069         //infostream<<"scriptapi_luaentity_get_staticdata: id="<<id<<std::endl;
5070         StackUnroller stack_unroller(L);
5071
5072         // Get minetest.luaentities[id]
5073         luaentity_get(L, id);
5074         int object = lua_gettop(L);
5075
5076         // Get get_staticdata function
5077         lua_pushvalue(L, object);
5078         lua_getfield(L, -1, "get_staticdata");
5079         if(lua_isnil(L, -1))
5080                 return "";
5081
5082         luaL_checktype(L, -1, LUA_TFUNCTION);
5083         lua_pushvalue(L, object); // self
5084         // Call with 1 arguments, 1 results
5085         if(lua_pcall(L, 1, 1, 0))
5086                 script_error(L, "error running function get_staticdata: %s\n",
5087                                 lua_tostring(L, -1));
5088
5089         size_t len=0;
5090         const char *s = lua_tolstring(L, -1, &len);
5091         return std::string(s, len);
5092 }
5093
5094 void scriptapi_luaentity_get_properties(lua_State *L, u16 id,
5095                 ObjectProperties *prop)
5096 {
5097         realitycheck(L);
5098         assert(lua_checkstack(L, 20));
5099         //infostream<<"scriptapi_luaentity_get_properties: id="<<id<<std::endl;
5100         StackUnroller stack_unroller(L);
5101
5102         // Get minetest.luaentities[id]
5103         luaentity_get(L, id);
5104         //int object = lua_gettop(L);
5105
5106         // Set default values that differ from ObjectProperties defaults
5107         prop->hp_max = 10;
5108
5109         // Deprecated: read object properties directly
5110         read_object_properties(L, -1, prop);
5111
5112         // Read initial_properties
5113         lua_getfield(L, -1, "initial_properties");
5114         read_object_properties(L, -1, prop);
5115         lua_pop(L, 1);
5116 }
5117
5118 void scriptapi_luaentity_step(lua_State *L, u16 id, float dtime)
5119 {
5120         realitycheck(L);
5121         assert(lua_checkstack(L, 20));
5122         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5123         StackUnroller stack_unroller(L);
5124
5125         // Get minetest.luaentities[id]
5126         luaentity_get(L, id);
5127         int object = lua_gettop(L);
5128         // State: object is at top of stack
5129         // Get step function
5130         lua_getfield(L, -1, "on_step");
5131         if(lua_isnil(L, -1))
5132                 return;
5133         luaL_checktype(L, -1, LUA_TFUNCTION);
5134         lua_pushvalue(L, object); // self
5135         lua_pushnumber(L, dtime); // dtime
5136         // Call with 2 arguments, 0 results
5137         if(lua_pcall(L, 2, 0, 0))
5138                 script_error(L, "error running function 'on_step': %s\n", lua_tostring(L, -1));
5139 }
5140
5141 // Calls entity:on_punch(ObjectRef puncher, time_from_last_punch,
5142 //                       tool_capabilities, direction)
5143 void scriptapi_luaentity_punch(lua_State *L, u16 id,
5144                 ServerActiveObject *puncher, float time_from_last_punch,
5145                 const ToolCapabilities *toolcap, v3f dir)
5146 {
5147         realitycheck(L);
5148         assert(lua_checkstack(L, 20));
5149         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5150         StackUnroller stack_unroller(L);
5151
5152         // Get minetest.luaentities[id]
5153         luaentity_get(L, id);
5154         int object = lua_gettop(L);
5155         // State: object is at top of stack
5156         // Get function
5157         lua_getfield(L, -1, "on_punch");
5158         if(lua_isnil(L, -1))
5159                 return;
5160         luaL_checktype(L, -1, LUA_TFUNCTION);
5161         lua_pushvalue(L, object); // self
5162         objectref_get_or_create(L, puncher); // Clicker reference
5163         lua_pushnumber(L, time_from_last_punch);
5164         push_tool_capabilities(L, *toolcap);
5165         push_v3f(L, dir);
5166         // Call with 5 arguments, 0 results
5167         if(lua_pcall(L, 5, 0, 0))
5168                 script_error(L, "error running function 'on_punch': %s\n", lua_tostring(L, -1));
5169 }
5170
5171 // Calls entity:on_rightclick(ObjectRef clicker)
5172 void scriptapi_luaentity_rightclick(lua_State *L, u16 id,
5173                 ServerActiveObject *clicker)
5174 {
5175         realitycheck(L);
5176         assert(lua_checkstack(L, 20));
5177         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5178         StackUnroller stack_unroller(L);
5179
5180         // Get minetest.luaentities[id]
5181         luaentity_get(L, id);
5182         int object = lua_gettop(L);
5183         // State: object is at top of stack
5184         // Get function
5185         lua_getfield(L, -1, "on_rightclick");
5186         if(lua_isnil(L, -1))
5187                 return;
5188         luaL_checktype(L, -1, LUA_TFUNCTION);
5189         lua_pushvalue(L, object); // self
5190         objectref_get_or_create(L, clicker); // Clicker reference
5191         // Call with 2 arguments, 0 results
5192         if(lua_pcall(L, 2, 0, 0))
5193                 script_error(L, "error running function 'on_rightclick': %s\n", lua_tostring(L, -1));
5194 }
5195