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->getInventoryDrawSpec();
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->getInventoryDrawSpec())
2116                         return 0;
2117                 meta->setInventoryDrawSpec(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->getFormSpec();
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->getFormSpec())
2147                         return 0;
2148                 meta->setFormSpec(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->getInfoText();
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->getInfoText())
2178                         return 0;
2179                 meta->setInfoText(str);
2180                 reportMetadataChange(ref);
2181                 return 0;
2182         }
2183
2184         // get_allow_removal(self)
2185         static int l_get_allow_removal(lua_State *L)
2186         {
2187                 NodeMetaRef *ref = checkobject(L, 1);
2188
2189                 NodeMetadata *meta = getmeta(ref, false);
2190                 if(meta == NULL){
2191                         lua_pushboolean(L, true);
2192                         return 1;
2193                 }
2194                 lua_pushboolean(L, meta->getAllowRemoval());
2195                 return 1;
2196         }
2197
2198         // set_allow_removal(self, flag)
2199         static int l_set_allow_removal(lua_State *L)
2200         {
2201                 NodeMetaRef *ref = checkobject(L, 1);
2202                 bool flag = lua_toboolean(L, 2);
2203
2204                 NodeMetadata *meta = getmeta(ref, flag != true);
2205                 if(meta == NULL || flag == meta->getAllowRemoval())
2206                         return 0;
2207                 meta->setAllowRemoval(flag);
2208                 reportMetadataChange(ref);
2209                 return 0;
2210         }
2211
2212 public:
2213         NodeMetaRef(v3s16 p, ServerEnvironment *env):
2214                 m_p(p),
2215                 m_env(env)
2216         {
2217         }
2218
2219         ~NodeMetaRef()
2220         {
2221         }
2222
2223         // Creates an NodeMetaRef and leaves it on top of stack
2224         // Not callable from Lua; all references are created on the C side.
2225         static void create(lua_State *L, v3s16 p, ServerEnvironment *env)
2226         {
2227                 NodeMetaRef *o = new NodeMetaRef(p, env);
2228                 //infostream<<"NodeMetaRef::create: o="<<o<<std::endl;
2229                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2230                 luaL_getmetatable(L, className);
2231                 lua_setmetatable(L, -2);
2232         }
2233
2234         static void Register(lua_State *L)
2235         {
2236                 lua_newtable(L);
2237                 int methodtable = lua_gettop(L);
2238                 luaL_newmetatable(L, className);
2239                 int metatable = lua_gettop(L);
2240
2241                 lua_pushliteral(L, "__metatable");
2242                 lua_pushvalue(L, methodtable);
2243                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2244
2245                 lua_pushliteral(L, "__index");
2246                 lua_pushvalue(L, methodtable);
2247                 lua_settable(L, metatable);
2248
2249                 lua_pushliteral(L, "__gc");
2250                 lua_pushcfunction(L, gc_object);
2251                 lua_settable(L, metatable);
2252
2253                 lua_pop(L, 1);  // drop metatable
2254
2255                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2256                 lua_pop(L, 1);  // drop methodtable
2257
2258                 // Cannot be created from Lua
2259                 //lua_register(L, className, create_object);
2260         }
2261 };
2262 const char NodeMetaRef::className[] = "NodeMetaRef";
2263 const luaL_reg NodeMetaRef::methods[] = {
2264         method(NodeMetaRef, get_string),
2265         method(NodeMetaRef, set_string),
2266         method(NodeMetaRef, get_int),
2267         method(NodeMetaRef, set_int),
2268         method(NodeMetaRef, get_float),
2269         method(NodeMetaRef, set_float),
2270         method(NodeMetaRef, get_inventory),
2271         method(NodeMetaRef, get_inventory_draw_spec),
2272         method(NodeMetaRef, set_inventory_draw_spec),
2273         method(NodeMetaRef, get_form_spec),
2274         method(NodeMetaRef, set_form_spec),
2275         method(NodeMetaRef, get_infotext),
2276         method(NodeMetaRef, set_infotext),
2277         method(NodeMetaRef, get_allow_removal),
2278         method(NodeMetaRef, set_allow_removal),
2279         {0,0}
2280 };
2281
2282 /*
2283         ObjectRef
2284 */
2285
2286 class ObjectRef
2287 {
2288 private:
2289         ServerActiveObject *m_object;
2290
2291         static const char className[];
2292         static const luaL_reg methods[];
2293 public:
2294         static ObjectRef *checkobject(lua_State *L, int narg)
2295         {
2296                 luaL_checktype(L, narg, LUA_TUSERDATA);
2297                 void *ud = luaL_checkudata(L, narg, className);
2298                 if(!ud) luaL_typerror(L, narg, className);
2299                 return *(ObjectRef**)ud;  // unbox pointer
2300         }
2301
2302         static ServerActiveObject* getobject(ObjectRef *ref)
2303         {
2304                 ServerActiveObject *co = ref->m_object;
2305                 return co;
2306         }
2307 private:
2308         static LuaEntitySAO* getluaobject(ObjectRef *ref)
2309         {
2310                 ServerActiveObject *obj = getobject(ref);
2311                 if(obj == NULL)
2312                         return NULL;
2313                 if(obj->getType() != ACTIVEOBJECT_TYPE_LUAENTITY)
2314                         return NULL;
2315                 return (LuaEntitySAO*)obj;
2316         }
2317
2318         static PlayerSAO* getplayersao(ObjectRef *ref)
2319         {
2320                 ServerActiveObject *obj = getobject(ref);
2321                 if(obj == NULL)
2322                         return NULL;
2323                 if(obj->getType() != ACTIVEOBJECT_TYPE_PLAYER)
2324                         return NULL;
2325                 return (PlayerSAO*)obj;
2326         }
2327
2328         static Player* getplayer(ObjectRef *ref)
2329         {
2330                 PlayerSAO *playersao = getplayersao(ref);
2331                 if(playersao == NULL)
2332                         return NULL;
2333                 return playersao->getPlayer();
2334         }
2335
2336         // Exported functions
2337
2338         // garbage collector
2339         static int gc_object(lua_State *L) {
2340                 ObjectRef *o = *(ObjectRef **)(lua_touserdata(L, 1));
2341                 //infostream<<"ObjectRef::gc_object: o="<<o<<std::endl;
2342                 delete o;
2343                 return 0;
2344         }
2345
2346         // remove(self)
2347         static int l_remove(lua_State *L)
2348         {
2349                 ObjectRef *ref = checkobject(L, 1);
2350                 ServerActiveObject *co = getobject(ref);
2351                 if(co == NULL) return 0;
2352                 verbosestream<<"ObjectRef::l_remove(): id="<<co->getId()<<std::endl;
2353                 co->m_removed = true;
2354                 return 0;
2355         }
2356
2357         // getpos(self)
2358         // returns: {x=num, y=num, z=num}
2359         static int l_getpos(lua_State *L)
2360         {
2361                 ObjectRef *ref = checkobject(L, 1);
2362                 ServerActiveObject *co = getobject(ref);
2363                 if(co == NULL) return 0;
2364                 v3f pos = co->getBasePosition() / BS;
2365                 lua_newtable(L);
2366                 lua_pushnumber(L, pos.X);
2367                 lua_setfield(L, -2, "x");
2368                 lua_pushnumber(L, pos.Y);
2369                 lua_setfield(L, -2, "y");
2370                 lua_pushnumber(L, pos.Z);
2371                 lua_setfield(L, -2, "z");
2372                 return 1;
2373         }
2374
2375         // setpos(self, pos)
2376         static int l_setpos(lua_State *L)
2377         {
2378                 ObjectRef *ref = checkobject(L, 1);
2379                 //LuaEntitySAO *co = getluaobject(ref);
2380                 ServerActiveObject *co = getobject(ref);
2381                 if(co == NULL) return 0;
2382                 // pos
2383                 v3f pos = checkFloatPos(L, 2);
2384                 // Do it
2385                 co->setPos(pos);
2386                 return 0;
2387         }
2388
2389         // moveto(self, pos, continuous=false)
2390         static int l_moveto(lua_State *L)
2391         {
2392                 ObjectRef *ref = checkobject(L, 1);
2393                 //LuaEntitySAO *co = getluaobject(ref);
2394                 ServerActiveObject *co = getobject(ref);
2395                 if(co == NULL) return 0;
2396                 // pos
2397                 v3f pos = checkFloatPos(L, 2);
2398                 // continuous
2399                 bool continuous = lua_toboolean(L, 3);
2400                 // Do it
2401                 co->moveTo(pos, continuous);
2402                 return 0;
2403         }
2404
2405         // punch(self, puncher, tool_capabilities, direction, time_from_last_punch)
2406         static int l_punch(lua_State *L)
2407         {
2408                 ObjectRef *ref = checkobject(L, 1);
2409                 ObjectRef *puncher_ref = checkobject(L, 2);
2410                 ServerActiveObject *co = getobject(ref);
2411                 ServerActiveObject *puncher = getobject(puncher_ref);
2412                 if(co == NULL) return 0;
2413                 if(puncher == NULL) return 0;
2414                 ToolCapabilities toolcap = read_tool_capabilities(L, 3);
2415                 v3f dir = read_v3f(L, 4);
2416                 float time_from_last_punch = 1000000;
2417                 if(lua_isnumber(L, 5))
2418                         time_from_last_punch = lua_tonumber(L, 5);
2419                 // Do it
2420                 puncher->punch(dir, &toolcap, puncher, time_from_last_punch);
2421                 return 0;
2422         }
2423
2424         // right_click(self, clicker); clicker = an another ObjectRef
2425         static int l_right_click(lua_State *L)
2426         {
2427                 ObjectRef *ref = checkobject(L, 1);
2428                 ObjectRef *ref2 = checkobject(L, 2);
2429                 ServerActiveObject *co = getobject(ref);
2430                 ServerActiveObject *co2 = getobject(ref2);
2431                 if(co == NULL) return 0;
2432                 if(co2 == NULL) return 0;
2433                 // Do it
2434                 co->rightClick(co2);
2435                 return 0;
2436         }
2437
2438         // set_hp(self, hp)
2439         // hp = number of hitpoints (2 * number of hearts)
2440         // returns: nil
2441         static int l_set_hp(lua_State *L)
2442         {
2443                 ObjectRef *ref = checkobject(L, 1);
2444                 luaL_checknumber(L, 2);
2445                 ServerActiveObject *co = getobject(ref);
2446                 if(co == NULL) return 0;
2447                 int hp = lua_tonumber(L, 2);
2448                 /*infostream<<"ObjectRef::l_set_hp(): id="<<co->getId()
2449                                 <<" hp="<<hp<<std::endl;*/
2450                 // Do it
2451                 co->setHP(hp);
2452                 // Return
2453                 return 0;
2454         }
2455
2456         // get_hp(self)
2457         // returns: number of hitpoints (2 * number of hearts)
2458         // 0 if not applicable to this type of object
2459         static int l_get_hp(lua_State *L)
2460         {
2461                 ObjectRef *ref = checkobject(L, 1);
2462                 ServerActiveObject *co = getobject(ref);
2463                 if(co == NULL) return 0;
2464                 int hp = co->getHP();
2465                 /*infostream<<"ObjectRef::l_get_hp(): id="<<co->getId()
2466                                 <<" hp="<<hp<<std::endl;*/
2467                 // Return
2468                 lua_pushnumber(L, hp);
2469                 return 1;
2470         }
2471
2472         // get_inventory(self)
2473         static int l_get_inventory(lua_State *L)
2474         {
2475                 ObjectRef *ref = checkobject(L, 1);
2476                 ServerActiveObject *co = getobject(ref);
2477                 if(co == NULL) return 0;
2478                 // Do it
2479                 InventoryLocation loc = co->getInventoryLocation();
2480                 if(get_server(L)->getInventory(loc) != NULL)
2481                         InvRef::create(L, loc);
2482                 else
2483                         lua_pushnil(L);
2484                 return 1;
2485         }
2486
2487         // get_wield_list(self)
2488         static int l_get_wield_list(lua_State *L)
2489         {
2490                 ObjectRef *ref = checkobject(L, 1);
2491                 ServerActiveObject *co = getobject(ref);
2492                 if(co == NULL) return 0;
2493                 // Do it
2494                 lua_pushstring(L, co->getWieldList().c_str());
2495                 return 1;
2496         }
2497
2498         // get_wield_index(self)
2499         static int l_get_wield_index(lua_State *L)
2500         {
2501                 ObjectRef *ref = checkobject(L, 1);
2502                 ServerActiveObject *co = getobject(ref);
2503                 if(co == NULL) return 0;
2504                 // Do it
2505                 lua_pushinteger(L, co->getWieldIndex() + 1);
2506                 return 1;
2507         }
2508
2509         // get_wielded_item(self)
2510         static int l_get_wielded_item(lua_State *L)
2511         {
2512                 ObjectRef *ref = checkobject(L, 1);
2513                 ServerActiveObject *co = getobject(ref);
2514                 if(co == NULL) return 0;
2515                 // Do it
2516                 LuaItemStack::create(L, co->getWieldedItem());
2517                 return 1;
2518         }
2519
2520         // set_wielded_item(self, itemstack or itemstring or table or nil)
2521         static int l_set_wielded_item(lua_State *L)
2522         {
2523                 ObjectRef *ref = checkobject(L, 1);
2524                 ServerActiveObject *co = getobject(ref);
2525                 if(co == NULL) return 0;
2526                 // Do it
2527                 ItemStack item = read_item(L, 2);
2528                 bool success = co->setWieldedItem(item);
2529                 lua_pushboolean(L, success);
2530                 return 1;
2531         }
2532
2533         // set_armor_groups(self, groups)
2534         static int l_set_armor_groups(lua_State *L)
2535         {
2536                 ObjectRef *ref = checkobject(L, 1);
2537                 ServerActiveObject *co = getobject(ref);
2538                 if(co == NULL) return 0;
2539                 // Do it
2540                 ItemGroupList groups;
2541                 read_groups(L, 2, groups);
2542                 co->setArmorGroups(groups);
2543                 return 0;
2544         }
2545
2546         // set_properties(self, properties)
2547         static int l_set_properties(lua_State *L)
2548         {
2549                 ObjectRef *ref = checkobject(L, 1);
2550                 ServerActiveObject *co = getobject(ref);
2551                 if(co == NULL) return 0;
2552                 ObjectProperties *prop = co->accessObjectProperties();
2553                 if(!prop)
2554                         return 0;
2555                 read_object_properties(L, 2, prop);
2556                 co->notifyObjectPropertiesModified();
2557                 return 0;
2558         }
2559
2560         /* LuaEntitySAO-only */
2561
2562         // setvelocity(self, {x=num, y=num, z=num})
2563         static int l_setvelocity(lua_State *L)
2564         {
2565                 ObjectRef *ref = checkobject(L, 1);
2566                 LuaEntitySAO *co = getluaobject(ref);
2567                 if(co == NULL) return 0;
2568                 v3f pos = checkFloatPos(L, 2);
2569                 // Do it
2570                 co->setVelocity(pos);
2571                 return 0;
2572         }
2573
2574         // getvelocity(self)
2575         static int l_getvelocity(lua_State *L)
2576         {
2577                 ObjectRef *ref = checkobject(L, 1);
2578                 LuaEntitySAO *co = getluaobject(ref);
2579                 if(co == NULL) return 0;
2580                 // Do it
2581                 v3f v = co->getVelocity();
2582                 pushFloatPos(L, v);
2583                 return 1;
2584         }
2585
2586         // setacceleration(self, {x=num, y=num, z=num})
2587         static int l_setacceleration(lua_State *L)
2588         {
2589                 ObjectRef *ref = checkobject(L, 1);
2590                 LuaEntitySAO *co = getluaobject(ref);
2591                 if(co == NULL) return 0;
2592                 // pos
2593                 v3f pos = checkFloatPos(L, 2);
2594                 // Do it
2595                 co->setAcceleration(pos);
2596                 return 0;
2597         }
2598
2599         // getacceleration(self)
2600         static int l_getacceleration(lua_State *L)
2601         {
2602                 ObjectRef *ref = checkobject(L, 1);
2603                 LuaEntitySAO *co = getluaobject(ref);
2604                 if(co == NULL) return 0;
2605                 // Do it
2606                 v3f v = co->getAcceleration();
2607                 pushFloatPos(L, v);
2608                 return 1;
2609         }
2610
2611         // setyaw(self, radians)
2612         static int l_setyaw(lua_State *L)
2613         {
2614                 ObjectRef *ref = checkobject(L, 1);
2615                 LuaEntitySAO *co = getluaobject(ref);
2616                 if(co == NULL) return 0;
2617                 float yaw = luaL_checknumber(L, 2) * core::RADTODEG;
2618                 // Do it
2619                 co->setYaw(yaw);
2620                 return 0;
2621         }
2622
2623         // getyaw(self)
2624         static int l_getyaw(lua_State *L)
2625         {
2626                 ObjectRef *ref = checkobject(L, 1);
2627                 LuaEntitySAO *co = getluaobject(ref);
2628                 if(co == NULL) return 0;
2629                 // Do it
2630                 float yaw = co->getYaw() * core::DEGTORAD;
2631                 lua_pushnumber(L, yaw);
2632                 return 1;
2633         }
2634
2635         // settexturemod(self, mod)
2636         static int l_settexturemod(lua_State *L)
2637         {
2638                 ObjectRef *ref = checkobject(L, 1);
2639                 LuaEntitySAO *co = getluaobject(ref);
2640                 if(co == NULL) return 0;
2641                 // Do it
2642                 std::string mod = luaL_checkstring(L, 2);
2643                 co->setTextureMod(mod);
2644                 return 0;
2645         }
2646
2647         // setsprite(self, p={x=0,y=0}, num_frames=1, framelength=0.2,
2648         //           select_horiz_by_yawpitch=false)
2649         static int l_setsprite(lua_State *L)
2650         {
2651                 ObjectRef *ref = checkobject(L, 1);
2652                 LuaEntitySAO *co = getluaobject(ref);
2653                 if(co == NULL) return 0;
2654                 // Do it
2655                 v2s16 p(0,0);
2656                 if(!lua_isnil(L, 2))
2657                         p = read_v2s16(L, 2);
2658                 int num_frames = 1;
2659                 if(!lua_isnil(L, 3))
2660                         num_frames = lua_tonumber(L, 3);
2661                 float framelength = 0.2;
2662                 if(!lua_isnil(L, 4))
2663                         framelength = lua_tonumber(L, 4);
2664                 bool select_horiz_by_yawpitch = false;
2665                 if(!lua_isnil(L, 5))
2666                         select_horiz_by_yawpitch = lua_toboolean(L, 5);
2667                 co->setSprite(p, num_frames, framelength, select_horiz_by_yawpitch);
2668                 return 0;
2669         }
2670
2671         // DEPRECATED
2672         // get_entity_name(self)
2673         static int l_get_entity_name(lua_State *L)
2674         {
2675                 ObjectRef *ref = checkobject(L, 1);
2676                 LuaEntitySAO *co = getluaobject(ref);
2677                 if(co == NULL) return 0;
2678                 // Do it
2679                 std::string name = co->getName();
2680                 lua_pushstring(L, name.c_str());
2681                 return 1;
2682         }
2683
2684         // get_luaentity(self)
2685         static int l_get_luaentity(lua_State *L)
2686         {
2687                 ObjectRef *ref = checkobject(L, 1);
2688                 LuaEntitySAO *co = getluaobject(ref);
2689                 if(co == NULL) return 0;
2690                 // Do it
2691                 luaentity_get(L, co->getId());
2692                 return 1;
2693         }
2694
2695         /* Player-only */
2696
2697         // get_player_name(self)
2698         static int l_get_player_name(lua_State *L)
2699         {
2700                 ObjectRef *ref = checkobject(L, 1);
2701                 Player *player = getplayer(ref);
2702                 if(player == NULL){
2703                         lua_pushnil(L);
2704                         return 1;
2705                 }
2706                 // Do it
2707                 lua_pushstring(L, player->getName());
2708                 return 1;
2709         }
2710
2711         // get_look_dir(self)
2712         static int l_get_look_dir(lua_State *L)
2713         {
2714                 ObjectRef *ref = checkobject(L, 1);
2715                 Player *player = getplayer(ref);
2716                 if(player == NULL) return 0;
2717                 // Do it
2718                 float pitch = player->getRadPitch();
2719                 float yaw = player->getRadYaw();
2720                 v3f v(cos(pitch)*cos(yaw), sin(pitch), cos(pitch)*sin(yaw));
2721                 push_v3f(L, v);
2722                 return 1;
2723         }
2724
2725         // get_look_pitch(self)
2726         static int l_get_look_pitch(lua_State *L)
2727         {
2728                 ObjectRef *ref = checkobject(L, 1);
2729                 Player *player = getplayer(ref);
2730                 if(player == NULL) return 0;
2731                 // Do it
2732                 lua_pushnumber(L, player->getRadPitch());
2733                 return 1;
2734         }
2735
2736         // get_look_yaw(self)
2737         static int l_get_look_yaw(lua_State *L)
2738         {
2739                 ObjectRef *ref = checkobject(L, 1);
2740                 Player *player = getplayer(ref);
2741                 if(player == NULL) return 0;
2742                 // Do it
2743                 lua_pushnumber(L, player->getRadYaw());
2744                 return 1;
2745         }
2746
2747 public:
2748         ObjectRef(ServerActiveObject *object):
2749                 m_object(object)
2750         {
2751                 //infostream<<"ObjectRef created for id="<<m_object->getId()<<std::endl;
2752         }
2753
2754         ~ObjectRef()
2755         {
2756                 /*if(m_object)
2757                         infostream<<"ObjectRef destructing for id="
2758                                         <<m_object->getId()<<std::endl;
2759                 else
2760                         infostream<<"ObjectRef destructing for id=unknown"<<std::endl;*/
2761         }
2762
2763         // Creates an ObjectRef and leaves it on top of stack
2764         // Not callable from Lua; all references are created on the C side.
2765         static void create(lua_State *L, ServerActiveObject *object)
2766         {
2767                 ObjectRef *o = new ObjectRef(object);
2768                 //infostream<<"ObjectRef::create: o="<<o<<std::endl;
2769                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2770                 luaL_getmetatable(L, className);
2771                 lua_setmetatable(L, -2);
2772         }
2773
2774         static void set_null(lua_State *L)
2775         {
2776                 ObjectRef *o = checkobject(L, -1);
2777                 o->m_object = NULL;
2778         }
2779
2780         static void Register(lua_State *L)
2781         {
2782                 lua_newtable(L);
2783                 int methodtable = lua_gettop(L);
2784                 luaL_newmetatable(L, className);
2785                 int metatable = lua_gettop(L);
2786
2787                 lua_pushliteral(L, "__metatable");
2788                 lua_pushvalue(L, methodtable);
2789                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2790
2791                 lua_pushliteral(L, "__index");
2792                 lua_pushvalue(L, methodtable);
2793                 lua_settable(L, metatable);
2794
2795                 lua_pushliteral(L, "__gc");
2796                 lua_pushcfunction(L, gc_object);
2797                 lua_settable(L, metatable);
2798
2799                 lua_pop(L, 1);  // drop metatable
2800
2801                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2802                 lua_pop(L, 1);  // drop methodtable
2803
2804                 // Cannot be created from Lua
2805                 //lua_register(L, className, create_object);
2806         }
2807 };
2808 const char ObjectRef::className[] = "ObjectRef";
2809 const luaL_reg ObjectRef::methods[] = {
2810         // ServerActiveObject
2811         method(ObjectRef, remove),
2812         method(ObjectRef, getpos),
2813         method(ObjectRef, setpos),
2814         method(ObjectRef, moveto),
2815         method(ObjectRef, punch),
2816         method(ObjectRef, right_click),
2817         method(ObjectRef, set_hp),
2818         method(ObjectRef, get_hp),
2819         method(ObjectRef, get_inventory),
2820         method(ObjectRef, get_wield_list),
2821         method(ObjectRef, get_wield_index),
2822         method(ObjectRef, get_wielded_item),
2823         method(ObjectRef, set_wielded_item),
2824         method(ObjectRef, set_armor_groups),
2825         method(ObjectRef, set_properties),
2826         // LuaEntitySAO-only
2827         method(ObjectRef, setvelocity),
2828         method(ObjectRef, getvelocity),
2829         method(ObjectRef, setacceleration),
2830         method(ObjectRef, getacceleration),
2831         method(ObjectRef, setyaw),
2832         method(ObjectRef, getyaw),
2833         method(ObjectRef, settexturemod),
2834         method(ObjectRef, setsprite),
2835         method(ObjectRef, get_entity_name),
2836         method(ObjectRef, get_luaentity),
2837         // Player-only
2838         method(ObjectRef, get_player_name),
2839         method(ObjectRef, get_look_dir),
2840         method(ObjectRef, get_look_pitch),
2841         method(ObjectRef, get_look_yaw),
2842         {0,0}
2843 };
2844
2845 // Creates a new anonymous reference if id=0
2846 static void objectref_get_or_create(lua_State *L,
2847                 ServerActiveObject *cobj)
2848 {
2849         if(cobj->getId() == 0){
2850                 ObjectRef::create(L, cobj);
2851         } else {
2852                 objectref_get(L, cobj->getId());
2853         }
2854 }
2855
2856
2857 /*
2858   PerlinNoise
2859  */
2860
2861 class LuaPerlinNoise
2862 {
2863 private:
2864         int seed;
2865         int octaves;
2866         double persistence;
2867         double scale;
2868         static const char className[];
2869         static const luaL_reg methods[];
2870
2871         // Exported functions
2872
2873         // garbage collector
2874         static int gc_object(lua_State *L)
2875         {
2876                 LuaPerlinNoise *o = *(LuaPerlinNoise **)(lua_touserdata(L, 1));
2877                 delete o;
2878                 return 0;
2879         }
2880
2881         static int l_get2d(lua_State *L)
2882         {
2883                 LuaPerlinNoise *o = checkobject(L, 1);
2884                 v2f pos2d = read_v2f(L,2);
2885                 lua_Number val = noise2d_perlin(pos2d.X/o->scale, pos2d.Y/o->scale, o->seed, o->octaves, o->persistence);
2886                 lua_pushnumber(L, val);
2887                 return 1;
2888         }
2889         static int l_get3d(lua_State *L)
2890         {
2891                 LuaPerlinNoise *o = checkobject(L, 1);
2892                 v3f pos3d = read_v3f(L,2);
2893                 lua_Number val = noise3d_perlin(pos3d.X/o->scale, pos3d.Y/o->scale, pos3d.Z/o->scale, o->seed, o->octaves, o->persistence);
2894                 lua_pushnumber(L, val);
2895                 return 1;
2896         }
2897
2898 public:
2899         LuaPerlinNoise(int a_seed, int a_octaves, double a_persistence,
2900                         double a_scale):
2901                 seed(a_seed),
2902                 octaves(a_octaves),
2903                 persistence(a_persistence),
2904                 scale(a_scale)
2905         {
2906         }
2907
2908         ~LuaPerlinNoise()
2909         {
2910         }
2911
2912         // LuaPerlinNoise(seed, octaves, persistence, scale)
2913         // Creates an LuaPerlinNoise and leaves it on top of stack
2914         static int create_object(lua_State *L)
2915         {
2916                 int seed = luaL_checkint(L, 1);
2917                 int octaves = luaL_checkint(L, 2);
2918                 double persistence = luaL_checknumber(L, 3);
2919                 double scale = luaL_checknumber(L, 4);
2920                 LuaPerlinNoise *o = new LuaPerlinNoise(seed, octaves, persistence, scale);
2921                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
2922                 luaL_getmetatable(L, className);
2923                 lua_setmetatable(L, -2);
2924                 return 1;
2925         }
2926
2927         static LuaPerlinNoise* checkobject(lua_State *L, int narg)
2928         {
2929                 luaL_checktype(L, narg, LUA_TUSERDATA);
2930                 void *ud = luaL_checkudata(L, narg, className);
2931                 if(!ud) luaL_typerror(L, narg, className);
2932                 return *(LuaPerlinNoise**)ud;  // unbox pointer
2933         }
2934
2935         static void Register(lua_State *L)
2936         {
2937                 lua_newtable(L);
2938                 int methodtable = lua_gettop(L);
2939                 luaL_newmetatable(L, className);
2940                 int metatable = lua_gettop(L);
2941
2942                 lua_pushliteral(L, "__metatable");
2943                 lua_pushvalue(L, methodtable);
2944                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
2945
2946                 lua_pushliteral(L, "__index");
2947                 lua_pushvalue(L, methodtable);
2948                 lua_settable(L, metatable);
2949
2950                 lua_pushliteral(L, "__gc");
2951                 lua_pushcfunction(L, gc_object);
2952                 lua_settable(L, metatable);
2953
2954                 lua_pop(L, 1);  // drop metatable
2955
2956                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
2957                 lua_pop(L, 1);  // drop methodtable
2958
2959                 // Can be created from Lua (PerlinNoise(seed, octaves, persistence)
2960                 lua_register(L, className, create_object);
2961         }
2962 };
2963 const char LuaPerlinNoise::className[] = "PerlinNoise";
2964 const luaL_reg LuaPerlinNoise::methods[] = {
2965         method(LuaPerlinNoise, get2d),
2966         method(LuaPerlinNoise, get3d),
2967         {0,0}
2968 };
2969
2970 /*
2971         EnvRef
2972 */
2973
2974 class EnvRef
2975 {
2976 private:
2977         ServerEnvironment *m_env;
2978
2979         static const char className[];
2980         static const luaL_reg methods[];
2981
2982         static int gc_object(lua_State *L) {
2983                 EnvRef *o = *(EnvRef **)(lua_touserdata(L, 1));
2984                 delete o;
2985                 return 0;
2986         }
2987
2988         static EnvRef *checkobject(lua_State *L, int narg)
2989         {
2990                 luaL_checktype(L, narg, LUA_TUSERDATA);
2991                 void *ud = luaL_checkudata(L, narg, className);
2992                 if(!ud) luaL_typerror(L, narg, className);
2993                 return *(EnvRef**)ud;  // unbox pointer
2994         }
2995
2996         // Exported functions
2997
2998         // EnvRef:set_node(pos, node)
2999         // pos = {x=num, y=num, z=num}
3000         static int l_set_node(lua_State *L)
3001         {
3002                 //infostream<<"EnvRef::l_set_node()"<<std::endl;
3003                 EnvRef *o = checkobject(L, 1);
3004                 ServerEnvironment *env = o->m_env;
3005                 if(env == NULL) return 0;
3006                 // pos
3007                 v3s16 pos = read_v3s16(L, 2);
3008                 // content
3009                 MapNode n = readnode(L, 3, env->getGameDef()->ndef());
3010                 // Do it
3011                 bool succeeded = env->getMap().addNodeWithEvent(pos, n);
3012                 lua_pushboolean(L, succeeded);
3013                 return 1;
3014         }
3015
3016         static int l_add_node(lua_State *L)
3017         {
3018                 return l_set_node(L);
3019         }
3020
3021         // EnvRef:remove_node(pos)
3022         // pos = {x=num, y=num, z=num}
3023         static int l_remove_node(lua_State *L)
3024         {
3025                 //infostream<<"EnvRef::l_remove_node()"<<std::endl;
3026                 EnvRef *o = checkobject(L, 1);
3027                 ServerEnvironment *env = o->m_env;
3028                 if(env == NULL) return 0;
3029                 // pos
3030                 v3s16 pos = read_v3s16(L, 2);
3031                 // Do it
3032                 bool succeeded = env->getMap().removeNodeWithEvent(pos);
3033                 lua_pushboolean(L, succeeded);
3034                 return 1;
3035         }
3036
3037         // EnvRef:get_node(pos)
3038         // pos = {x=num, y=num, z=num}
3039         static int l_get_node(lua_State *L)
3040         {
3041                 //infostream<<"EnvRef::l_get_node()"<<std::endl;
3042                 EnvRef *o = checkobject(L, 1);
3043                 ServerEnvironment *env = o->m_env;
3044                 if(env == NULL) return 0;
3045                 // pos
3046                 v3s16 pos = read_v3s16(L, 2);
3047                 // Do it
3048                 MapNode n = env->getMap().getNodeNoEx(pos);
3049                 // Return node
3050                 pushnode(L, n, env->getGameDef()->ndef());
3051                 return 1;
3052         }
3053
3054         // EnvRef:get_node_or_nil(pos)
3055         // pos = {x=num, y=num, z=num}
3056         static int l_get_node_or_nil(lua_State *L)
3057         {
3058                 //infostream<<"EnvRef::l_get_node()"<<std::endl;
3059                 EnvRef *o = checkobject(L, 1);
3060                 ServerEnvironment *env = o->m_env;
3061                 if(env == NULL) return 0;
3062                 // pos
3063                 v3s16 pos = read_v3s16(L, 2);
3064                 // Do it
3065                 try{
3066                         MapNode n = env->getMap().getNode(pos);
3067                         // Return node
3068                         pushnode(L, n, env->getGameDef()->ndef());
3069                         return 1;
3070                 } catch(InvalidPositionException &e)
3071                 {
3072                         lua_pushnil(L);
3073                         return 1;
3074                 }
3075         }
3076
3077         // EnvRef:get_node_light(pos, timeofday)
3078         // pos = {x=num, y=num, z=num}
3079         // timeofday: nil = current time, 0 = night, 0.5 = day
3080         static int l_get_node_light(lua_State *L)
3081         {
3082                 EnvRef *o = checkobject(L, 1);
3083                 ServerEnvironment *env = o->m_env;
3084                 if(env == NULL) return 0;
3085                 // Do it
3086                 v3s16 pos = read_v3s16(L, 2);
3087                 u32 time_of_day = env->getTimeOfDay();
3088                 if(lua_isnumber(L, 3))
3089                         time_of_day = 24000.0 * lua_tonumber(L, 3);
3090                 time_of_day %= 24000;
3091                 u32 dnr = time_to_daynight_ratio(time_of_day);
3092                 MapNode n = env->getMap().getNodeNoEx(pos);
3093                 try{
3094                         MapNode n = env->getMap().getNode(pos);
3095                         INodeDefManager *ndef = env->getGameDef()->ndef();
3096                         lua_pushinteger(L, n.getLightBlend(dnr, ndef));
3097                         return 1;
3098                 } catch(InvalidPositionException &e)
3099                 {
3100                         lua_pushnil(L);
3101                         return 1;
3102                 }
3103         }
3104
3105         // EnvRef:add_entity(pos, entityname) -> ObjectRef or nil
3106         // pos = {x=num, y=num, z=num}
3107         static int l_add_entity(lua_State *L)
3108         {
3109                 //infostream<<"EnvRef::l_add_entity()"<<std::endl;
3110                 EnvRef *o = checkobject(L, 1);
3111                 ServerEnvironment *env = o->m_env;
3112                 if(env == NULL) return 0;
3113                 // pos
3114                 v3f pos = checkFloatPos(L, 2);
3115                 // content
3116                 const char *name = luaL_checkstring(L, 3);
3117                 // Do it
3118                 ServerActiveObject *obj = new LuaEntitySAO(env, pos, name, "");
3119                 int objectid = env->addActiveObject(obj);
3120                 // If failed to add, return nothing (reads as nil)
3121                 if(objectid == 0)
3122                         return 0;
3123                 // Return ObjectRef
3124                 objectref_get_or_create(L, obj);
3125                 return 1;
3126         }
3127
3128         // EnvRef:add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
3129         // pos = {x=num, y=num, z=num}
3130         static int l_add_item(lua_State *L)
3131         {
3132                 //infostream<<"EnvRef::l_add_item()"<<std::endl;
3133                 EnvRef *o = checkobject(L, 1);
3134                 ServerEnvironment *env = o->m_env;
3135                 if(env == NULL) return 0;
3136                 // pos
3137                 v3f pos = checkFloatPos(L, 2);
3138                 // item
3139                 ItemStack item = read_item(L, 3);
3140                 if(item.empty() || !item.isKnown(get_server(L)->idef()))
3141                         return 0;
3142                 // Use minetest.spawn_item to spawn a __builtin:item
3143                 lua_getglobal(L, "minetest");
3144                 lua_getfield(L, -1, "spawn_item");
3145                 if(lua_isnil(L, -1))
3146                         return 0;
3147                 lua_pushvalue(L, 2);
3148                 lua_pushstring(L, item.getItemString().c_str());
3149                 if(lua_pcall(L, 2, 1, 0))
3150                         script_error(L, "error: %s", lua_tostring(L, -1));
3151                 return 1;
3152                 /*lua_pushvalue(L, 1);
3153                 lua_pushstring(L, "__builtin:item");
3154                 lua_pushstring(L, item.getItemString().c_str());
3155                 return l_add_entity(L);*/
3156                 /*// Do it
3157                 ServerActiveObject *obj = createItemSAO(env, pos, item.getItemString());
3158                 int objectid = env->addActiveObject(obj);
3159                 // If failed to add, return nothing (reads as nil)
3160                 if(objectid == 0)
3161                         return 0;
3162                 // Return ObjectRef
3163                 objectref_get_or_create(L, obj);
3164                 return 1;*/
3165         }
3166
3167         // EnvRef:add_rat(pos)
3168         // pos = {x=num, y=num, z=num}
3169         static int l_add_rat(lua_State *L)
3170         {
3171                 infostream<<"EnvRef::l_add_rat(): C++ mobs have been removed."
3172                                 <<" Doing nothing."<<std::endl;
3173                 return 0;
3174         }
3175
3176         // EnvRef:add_firefly(pos)
3177         // pos = {x=num, y=num, z=num}
3178         static int l_add_firefly(lua_State *L)
3179         {
3180                 infostream<<"EnvRef::l_add_firefly(): C++ mobs have been removed."
3181                                 <<" Doing nothing."<<std::endl;
3182                 return 0;
3183         }
3184
3185         // EnvRef:get_meta(pos)
3186         static int l_get_meta(lua_State *L)
3187         {
3188                 //infostream<<"EnvRef::l_get_meta()"<<std::endl;
3189                 EnvRef *o = checkobject(L, 1);
3190                 ServerEnvironment *env = o->m_env;
3191                 if(env == NULL) return 0;
3192                 // Do it
3193                 v3s16 p = read_v3s16(L, 2);
3194                 NodeMetaRef::create(L, p, env);
3195                 return 1;
3196         }
3197
3198         // EnvRef:get_player_by_name(name)
3199         static int l_get_player_by_name(lua_State *L)
3200         {
3201                 EnvRef *o = checkobject(L, 1);
3202                 ServerEnvironment *env = o->m_env;
3203                 if(env == NULL) return 0;
3204                 // Do it
3205                 const char *name = luaL_checkstring(L, 2);
3206                 Player *player = env->getPlayer(name);
3207                 if(player == NULL){
3208                         lua_pushnil(L);
3209                         return 1;
3210                 }
3211                 PlayerSAO *sao = player->getPlayerSAO();
3212                 if(sao == NULL){
3213                         lua_pushnil(L);
3214                         return 1;
3215                 }
3216                 // Put player on stack
3217                 objectref_get_or_create(L, sao);
3218                 return 1;
3219         }
3220
3221         // EnvRef:get_objects_inside_radius(pos, radius)
3222         static int l_get_objects_inside_radius(lua_State *L)
3223         {
3224                 // Get the table insert function
3225                 lua_getglobal(L, "table");
3226                 lua_getfield(L, -1, "insert");
3227                 int table_insert = lua_gettop(L);
3228                 // Get environemnt
3229                 EnvRef *o = checkobject(L, 1);
3230                 ServerEnvironment *env = o->m_env;
3231                 if(env == NULL) return 0;
3232                 // Do it
3233                 v3f pos = checkFloatPos(L, 2);
3234                 float radius = luaL_checknumber(L, 3) * BS;
3235                 std::set<u16> ids = env->getObjectsInsideRadius(pos, radius);
3236                 lua_newtable(L);
3237                 int table = lua_gettop(L);
3238                 for(std::set<u16>::const_iterator
3239                                 i = ids.begin(); i != ids.end(); i++){
3240                         ServerActiveObject *obj = env->getActiveObject(*i);
3241                         // Insert object reference into table
3242                         lua_pushvalue(L, table_insert);
3243                         lua_pushvalue(L, table);
3244                         objectref_get_or_create(L, obj);
3245                         if(lua_pcall(L, 2, 0, 0))
3246                                 script_error(L, "error: %s", lua_tostring(L, -1));
3247                 }
3248                 return 1;
3249         }
3250
3251         // EnvRef:set_timeofday(val)
3252         // val = 0...1
3253         static int l_set_timeofday(lua_State *L)
3254         {
3255                 EnvRef *o = checkobject(L, 1);
3256                 ServerEnvironment *env = o->m_env;
3257                 if(env == NULL) return 0;
3258                 // Do it
3259                 float timeofday_f = luaL_checknumber(L, 2);
3260                 assert(timeofday_f >= 0.0 && timeofday_f <= 1.0);
3261                 int timeofday_mh = (int)(timeofday_f * 24000.0);
3262                 // This should be set directly in the environment but currently
3263                 // such changes aren't immediately sent to the clients, so call
3264                 // the server instead.
3265                 //env->setTimeOfDay(timeofday_mh);
3266                 get_server(L)->setTimeOfDay(timeofday_mh);
3267                 return 0;
3268         }
3269
3270         // EnvRef:get_timeofday() -> 0...1
3271         static int l_get_timeofday(lua_State *L)
3272         {
3273                 EnvRef *o = checkobject(L, 1);
3274                 ServerEnvironment *env = o->m_env;
3275                 if(env == NULL) return 0;
3276                 // Do it
3277                 int timeofday_mh = env->getTimeOfDay();
3278                 float timeofday_f = (float)timeofday_mh / 24000.0;
3279                 lua_pushnumber(L, timeofday_f);
3280                 return 1;
3281         }
3282
3283
3284         // EnvRef:find_node_near(pos, radius, nodenames) -> pos or nil
3285         // nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
3286         static int l_find_node_near(lua_State *L)
3287         {
3288                 EnvRef *o = checkobject(L, 1);
3289                 ServerEnvironment *env = o->m_env;
3290                 if(env == NULL) return 0;
3291                 INodeDefManager *ndef = get_server(L)->ndef();
3292                 v3s16 pos = read_v3s16(L, 2);
3293                 int radius = luaL_checkinteger(L, 3);
3294                 std::set<content_t> filter;
3295                 if(lua_istable(L, 4)){
3296                         int table = 4;
3297                         lua_pushnil(L);
3298                         while(lua_next(L, table) != 0){
3299                                 // key at index -2 and value at index -1
3300                                 luaL_checktype(L, -1, LUA_TSTRING);
3301                                 ndef->getIds(lua_tostring(L, -1), filter);
3302                                 // removes value, keeps key for next iteration
3303                                 lua_pop(L, 1);
3304                         }
3305                 } else if(lua_isstring(L, 4)){
3306                         ndef->getIds(lua_tostring(L, 4), filter);
3307                 }
3308
3309                 for(int d=1; d<=radius; d++){
3310                         core::list<v3s16> list;
3311                         getFacePositions(list, d);
3312                         for(core::list<v3s16>::Iterator i = list.begin();
3313                                         i != list.end(); i++){
3314                                 v3s16 p = pos + (*i);
3315                                 content_t c = env->getMap().getNodeNoEx(p).getContent();
3316                                 if(filter.count(c) != 0){
3317                                         push_v3s16(L, p);
3318                                         return 1;
3319                                 }
3320                         }
3321                 }
3322                 return 0;
3323         }
3324
3325         // EnvRef:find_nodes_in_area(minp, maxp, nodenames) -> list of positions
3326         // nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
3327         static int l_find_nodes_in_area(lua_State *L)
3328         {
3329                 EnvRef *o = checkobject(L, 1);
3330                 ServerEnvironment *env = o->m_env;
3331                 if(env == NULL) return 0;
3332                 INodeDefManager *ndef = get_server(L)->ndef();
3333                 v3s16 minp = read_v3s16(L, 2);
3334                 v3s16 maxp = read_v3s16(L, 3);
3335                 std::set<content_t> filter;
3336                 if(lua_istable(L, 4)){
3337                         int table = 4;
3338                         lua_pushnil(L);
3339                         while(lua_next(L, table) != 0){
3340                                 // key at index -2 and value at index -1
3341                                 luaL_checktype(L, -1, LUA_TSTRING);
3342                                 ndef->getIds(lua_tostring(L, -1), filter);
3343                                 // removes value, keeps key for next iteration
3344                                 lua_pop(L, 1);
3345                         }
3346                 } else if(lua_isstring(L, 4)){
3347                         ndef->getIds(lua_tostring(L, 4), filter);
3348                 }
3349
3350                 // Get the table insert function
3351                 lua_getglobal(L, "table");
3352                 lua_getfield(L, -1, "insert");
3353                 int table_insert = lua_gettop(L);
3354
3355                 lua_newtable(L);
3356                 int table = lua_gettop(L);
3357                 for(s16 x=minp.X; x<=maxp.X; x++)
3358                 for(s16 y=minp.Y; y<=maxp.Y; y++)
3359                 for(s16 z=minp.Z; z<=maxp.Z; z++)
3360                 {
3361                         v3s16 p(x,y,z);
3362                         content_t c = env->getMap().getNodeNoEx(p).getContent();
3363                         if(filter.count(c) != 0){
3364                                 lua_pushvalue(L, table_insert);
3365                                 lua_pushvalue(L, table);
3366                                 push_v3s16(L, p);
3367                                 if(lua_pcall(L, 2, 0, 0))
3368                                         script_error(L, "error: %s", lua_tostring(L, -1));
3369                         }
3370                 }
3371                 return 1;
3372         }
3373
3374         //      EnvRef:get_perlin(seeddiff, octaves, persistence, scale)
3375         //  returns world-specific PerlinNoise
3376         static int l_get_perlin(lua_State *L)
3377         {
3378                 EnvRef *o = checkobject(L, 1);
3379                 ServerEnvironment *env = o->m_env;
3380                 if(env == NULL) return 0;
3381
3382                 int seeddiff = luaL_checkint(L, 2);
3383                 int octaves = luaL_checkint(L, 3);
3384                 double persistence = luaL_checknumber(L, 4);
3385                 double scale = luaL_checknumber(L, 5);
3386
3387                 LuaPerlinNoise *n = new LuaPerlinNoise(seeddiff + int(env->getServerMap().getSeed()), octaves, persistence, scale);
3388                 *(void **)(lua_newuserdata(L, sizeof(void *))) = n;
3389                 luaL_getmetatable(L, "PerlinNoise");
3390                 lua_setmetatable(L, -2);
3391                 return 1;
3392         }
3393
3394 public:
3395         EnvRef(ServerEnvironment *env):
3396                 m_env(env)
3397         {
3398                 //infostream<<"EnvRef created"<<std::endl;
3399         }
3400
3401         ~EnvRef()
3402         {
3403                 //infostream<<"EnvRef destructing"<<std::endl;
3404         }
3405
3406         // Creates an EnvRef and leaves it on top of stack
3407         // Not callable from Lua; all references are created on the C side.
3408         static void create(lua_State *L, ServerEnvironment *env)
3409         {
3410                 EnvRef *o = new EnvRef(env);
3411                 //infostream<<"EnvRef::create: o="<<o<<std::endl;
3412                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
3413                 luaL_getmetatable(L, className);
3414                 lua_setmetatable(L, -2);
3415         }
3416
3417         static void set_null(lua_State *L)
3418         {
3419                 EnvRef *o = checkobject(L, -1);
3420                 o->m_env = NULL;
3421         }
3422
3423         static void Register(lua_State *L)
3424         {
3425                 lua_newtable(L);
3426                 int methodtable = lua_gettop(L);
3427                 luaL_newmetatable(L, className);
3428                 int metatable = lua_gettop(L);
3429
3430                 lua_pushliteral(L, "__metatable");
3431                 lua_pushvalue(L, methodtable);
3432                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
3433
3434                 lua_pushliteral(L, "__index");
3435                 lua_pushvalue(L, methodtable);
3436                 lua_settable(L, metatable);
3437
3438                 lua_pushliteral(L, "__gc");
3439                 lua_pushcfunction(L, gc_object);
3440                 lua_settable(L, metatable);
3441
3442                 lua_pop(L, 1);  // drop metatable
3443
3444                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3445                 lua_pop(L, 1);  // drop methodtable
3446
3447                 // Cannot be created from Lua
3448                 //lua_register(L, className, create_object);
3449         }
3450 };
3451 const char EnvRef::className[] = "EnvRef";
3452 const luaL_reg EnvRef::methods[] = {
3453         method(EnvRef, set_node),
3454         method(EnvRef, add_node),
3455         method(EnvRef, remove_node),
3456         method(EnvRef, get_node),
3457         method(EnvRef, get_node_or_nil),
3458         method(EnvRef, get_node_light),
3459         method(EnvRef, add_entity),
3460         method(EnvRef, add_item),
3461         method(EnvRef, add_rat),
3462         method(EnvRef, add_firefly),
3463         method(EnvRef, get_meta),
3464         method(EnvRef, get_player_by_name),
3465         method(EnvRef, get_objects_inside_radius),
3466         method(EnvRef, set_timeofday),
3467         method(EnvRef, get_timeofday),
3468         method(EnvRef, find_node_near),
3469         method(EnvRef, find_nodes_in_area),
3470         method(EnvRef, get_perlin),
3471         {0,0}
3472 };
3473
3474 /*
3475         LuaPseudoRandom
3476 */
3477
3478
3479 class LuaPseudoRandom
3480 {
3481 private:
3482         PseudoRandom m_pseudo;
3483
3484         static const char className[];
3485         static const luaL_reg methods[];
3486
3487         // Exported functions
3488
3489         // garbage collector
3490         static int gc_object(lua_State *L)
3491         {
3492                 LuaPseudoRandom *o = *(LuaPseudoRandom **)(lua_touserdata(L, 1));
3493                 delete o;
3494                 return 0;
3495         }
3496
3497         // next(self, min=0, max=32767) -> get next value
3498         static int l_next(lua_State *L)
3499         {
3500                 LuaPseudoRandom *o = checkobject(L, 1);
3501                 int min = 0;
3502                 int max = 32767;
3503                 lua_settop(L, 3); // Fill 2 and 3 with nil if they don't exist
3504                 if(!lua_isnil(L, 2))
3505                         min = luaL_checkinteger(L, 2);
3506                 if(!lua_isnil(L, 3))
3507                         max = luaL_checkinteger(L, 3);
3508                 if(max - min != 32767 && max - min > 32767/5)
3509                         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.");
3510                 PseudoRandom &pseudo = o->m_pseudo;
3511                 int val = pseudo.next();
3512                 val = (val % (max-min+1)) + min;
3513                 lua_pushinteger(L, val);
3514                 return 1;
3515         }
3516
3517 public:
3518         LuaPseudoRandom(int seed):
3519                 m_pseudo(seed)
3520         {
3521         }
3522
3523         ~LuaPseudoRandom()
3524         {
3525         }
3526
3527         const PseudoRandom& getItem() const
3528         {
3529                 return m_pseudo;
3530         }
3531         PseudoRandom& getItem()
3532         {
3533                 return m_pseudo;
3534         }
3535
3536         // LuaPseudoRandom(seed)
3537         // Creates an LuaPseudoRandom and leaves it on top of stack
3538         static int create_object(lua_State *L)
3539         {
3540                 int seed = luaL_checknumber(L, 1);
3541                 LuaPseudoRandom *o = new LuaPseudoRandom(seed);
3542                 *(void **)(lua_newuserdata(L, sizeof(void *))) = o;
3543                 luaL_getmetatable(L, className);
3544                 lua_setmetatable(L, -2);
3545                 return 1;
3546         }
3547
3548         static LuaPseudoRandom* checkobject(lua_State *L, int narg)
3549         {
3550                 luaL_checktype(L, narg, LUA_TUSERDATA);
3551                 void *ud = luaL_checkudata(L, narg, className);
3552                 if(!ud) luaL_typerror(L, narg, className);
3553                 return *(LuaPseudoRandom**)ud;  // unbox pointer
3554         }
3555
3556         static void Register(lua_State *L)
3557         {
3558                 lua_newtable(L);
3559                 int methodtable = lua_gettop(L);
3560                 luaL_newmetatable(L, className);
3561                 int metatable = lua_gettop(L);
3562
3563                 lua_pushliteral(L, "__metatable");
3564                 lua_pushvalue(L, methodtable);
3565                 lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
3566
3567                 lua_pushliteral(L, "__index");
3568                 lua_pushvalue(L, methodtable);
3569                 lua_settable(L, metatable);
3570
3571                 lua_pushliteral(L, "__gc");
3572                 lua_pushcfunction(L, gc_object);
3573                 lua_settable(L, metatable);
3574
3575                 lua_pop(L, 1);  // drop metatable
3576
3577                 luaL_openlib(L, 0, methods, 0);  // fill methodtable
3578                 lua_pop(L, 1);  // drop methodtable
3579
3580                 // Can be created from Lua (LuaPseudoRandom(seed))
3581                 lua_register(L, className, create_object);
3582         }
3583 };
3584 const char LuaPseudoRandom::className[] = "PseudoRandom";
3585 const luaL_reg LuaPseudoRandom::methods[] = {
3586         method(LuaPseudoRandom, next),
3587         {0,0}
3588 };
3589
3590
3591
3592 /*
3593         LuaABM
3594 */
3595
3596 class LuaABM : public ActiveBlockModifier
3597 {
3598 private:
3599         lua_State *m_lua;
3600         int m_id;
3601
3602         std::set<std::string> m_trigger_contents;
3603         std::set<std::string> m_required_neighbors;
3604         float m_trigger_interval;
3605         u32 m_trigger_chance;
3606 public:
3607         LuaABM(lua_State *L, int id,
3608                         const std::set<std::string> &trigger_contents,
3609                         const std::set<std::string> &required_neighbors,
3610                         float trigger_interval, u32 trigger_chance):
3611                 m_lua(L),
3612                 m_id(id),
3613                 m_trigger_contents(trigger_contents),
3614                 m_required_neighbors(required_neighbors),
3615                 m_trigger_interval(trigger_interval),
3616                 m_trigger_chance(trigger_chance)
3617         {
3618         }
3619         virtual std::set<std::string> getTriggerContents()
3620         {
3621                 return m_trigger_contents;
3622         }
3623         virtual std::set<std::string> getRequiredNeighbors()
3624         {
3625                 return m_required_neighbors;
3626         }
3627         virtual float getTriggerInterval()
3628         {
3629                 return m_trigger_interval;
3630         }
3631         virtual u32 getTriggerChance()
3632         {
3633                 return m_trigger_chance;
3634         }
3635         virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n,
3636                         u32 active_object_count, u32 active_object_count_wider)
3637         {
3638                 lua_State *L = m_lua;
3639
3640                 realitycheck(L);
3641                 assert(lua_checkstack(L, 20));
3642                 StackUnroller stack_unroller(L);
3643
3644                 // Get minetest.registered_abms
3645                 lua_getglobal(L, "minetest");
3646                 lua_getfield(L, -1, "registered_abms");
3647                 luaL_checktype(L, -1, LUA_TTABLE);
3648                 int registered_abms = lua_gettop(L);
3649
3650                 // Get minetest.registered_abms[m_id]
3651                 lua_pushnumber(L, m_id);
3652                 lua_gettable(L, registered_abms);
3653                 if(lua_isnil(L, -1))
3654                         assert(0);
3655
3656                 // Call action
3657                 luaL_checktype(L, -1, LUA_TTABLE);
3658                 lua_getfield(L, -1, "action");
3659                 luaL_checktype(L, -1, LUA_TFUNCTION);
3660                 push_v3s16(L, p);
3661                 pushnode(L, n, env->getGameDef()->ndef());
3662                 lua_pushnumber(L, active_object_count);
3663                 lua_pushnumber(L, active_object_count_wider);
3664                 if(lua_pcall(L, 4, 0, 0))
3665                         script_error(L, "error: %s", lua_tostring(L, -1));
3666         }
3667 };
3668
3669 /*
3670         ServerSoundParams
3671 */
3672
3673 static void read_server_sound_params(lua_State *L, int index,
3674                 ServerSoundParams &params)
3675 {
3676         if(index < 0)
3677                 index = lua_gettop(L) + 1 + index;
3678         // Clear
3679         params = ServerSoundParams();
3680         if(lua_istable(L, index)){
3681                 getfloatfield(L, index, "gain", params.gain);
3682                 getstringfield(L, index, "to_player", params.to_player);
3683                 lua_getfield(L, index, "pos");
3684                 if(!lua_isnil(L, -1)){
3685                         v3f p = read_v3f(L, -1)*BS;
3686                         params.pos = p;
3687                         params.type = ServerSoundParams::SSP_POSITIONAL;
3688                 }
3689                 lua_pop(L, 1);
3690                 lua_getfield(L, index, "object");
3691                 if(!lua_isnil(L, -1)){
3692                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
3693                         ServerActiveObject *sao = ObjectRef::getobject(ref);
3694                         if(sao){
3695                                 params.object = sao->getId();
3696                                 params.type = ServerSoundParams::SSP_OBJECT;
3697                         }
3698                 }
3699                 lua_pop(L, 1);
3700                 params.max_hear_distance = BS*getfloatfield_default(L, index,
3701                                 "max_hear_distance", params.max_hear_distance/BS);
3702                 getboolfield(L, index, "loop", params.loop);
3703         }
3704 }
3705
3706 /*
3707         Global functions
3708 */
3709
3710 // debug(text)
3711 // Writes a line to dstream
3712 static int l_debug(lua_State *L)
3713 {
3714         std::string text = lua_tostring(L, 1);
3715         dstream << text << std::endl;
3716         return 0;
3717 }
3718
3719 // log([level,] text)
3720 // Writes a line to the logger.
3721 // The one-argument version logs to infostream.
3722 // The two-argument version accept a log level: error, action, info, or verbose.
3723 static int l_log(lua_State *L)
3724 {
3725         std::string text;
3726         LogMessageLevel level = LMT_INFO;
3727         if(lua_isnone(L, 2))
3728         {
3729                 text = lua_tostring(L, 1);
3730         }
3731         else
3732         {
3733                 std::string levelname = lua_tostring(L, 1);
3734                 text = lua_tostring(L, 2);
3735                 if(levelname == "error")
3736                         level = LMT_ERROR;
3737                 else if(levelname == "action")
3738                         level = LMT_ACTION;
3739                 else if(levelname == "verbose")
3740                         level = LMT_VERBOSE;
3741         }
3742         log_printline(level, text);
3743         return 0;
3744 }
3745
3746 // register_item_raw({lots of stuff})
3747 static int l_register_item_raw(lua_State *L)
3748 {
3749         luaL_checktype(L, 1, LUA_TTABLE);
3750         int table = 1;
3751
3752         // Get the writable item and node definition managers from the server
3753         IWritableItemDefManager *idef =
3754                         get_server(L)->getWritableItemDefManager();
3755         IWritableNodeDefManager *ndef =
3756                         get_server(L)->getWritableNodeDefManager();
3757
3758         // Check if name is defined
3759         lua_getfield(L, table, "name");
3760         if(lua_isstring(L, -1)){
3761                 std::string name = lua_tostring(L, -1);
3762                 verbosestream<<"register_item_raw: "<<name<<std::endl;
3763         } else {
3764                 throw LuaError(L, "register_item_raw: name is not defined or not a string");
3765         }
3766
3767         // Check if on_use is defined
3768
3769         // Read the item definition and register it
3770         ItemDefinition def = read_item_definition(L, table);
3771         idef->registerItem(def);
3772
3773         // Read the node definition (content features) and register it
3774         if(def.type == ITEM_NODE)
3775         {
3776                 ContentFeatures f = read_content_features(L, table);
3777                 ndef->set(f.name, f);
3778         }
3779
3780         return 0; /* number of results */
3781 }
3782
3783 // register_alias_raw(name, convert_to_name)
3784 static int l_register_alias_raw(lua_State *L)
3785 {
3786         std::string name = luaL_checkstring(L, 1);
3787         std::string convert_to = luaL_checkstring(L, 2);
3788
3789         // Get the writable item definition manager from the server
3790         IWritableItemDefManager *idef =
3791                         get_server(L)->getWritableItemDefManager();
3792
3793         idef->registerAlias(name, convert_to);
3794
3795         return 0; /* number of results */
3796 }
3797
3798 // helper for register_craft
3799 static bool read_craft_recipe_shaped(lua_State *L, int index,
3800                 int &width, std::vector<std::string> &recipe)
3801 {
3802         if(index < 0)
3803                 index = lua_gettop(L) + 1 + index;
3804
3805         if(!lua_istable(L, index))
3806                 return false;
3807
3808         lua_pushnil(L);
3809         int rowcount = 0;
3810         while(lua_next(L, index) != 0){
3811                 int colcount = 0;
3812                 // key at index -2 and value at index -1
3813                 if(!lua_istable(L, -1))
3814                         return false;
3815                 int table2 = lua_gettop(L);
3816                 lua_pushnil(L);
3817                 while(lua_next(L, table2) != 0){
3818                         // key at index -2 and value at index -1
3819                         if(!lua_isstring(L, -1))
3820                                 return false;
3821                         recipe.push_back(lua_tostring(L, -1));
3822                         // removes value, keeps key for next iteration
3823                         lua_pop(L, 1);
3824                         colcount++;
3825                 }
3826                 if(rowcount == 0){
3827                         width = colcount;
3828                 } else {
3829                         if(colcount != width)
3830                                 return false;
3831                 }
3832                 // removes value, keeps key for next iteration
3833                 lua_pop(L, 1);
3834                 rowcount++;
3835         }
3836         return width != 0;
3837 }
3838
3839 // helper for register_craft
3840 static bool read_craft_recipe_shapeless(lua_State *L, int index,
3841                 std::vector<std::string> &recipe)
3842 {
3843         if(index < 0)
3844                 index = lua_gettop(L) + 1 + index;
3845
3846         if(!lua_istable(L, index))
3847                 return false;
3848
3849         lua_pushnil(L);
3850         while(lua_next(L, index) != 0){
3851                 // key at index -2 and value at index -1
3852                 if(!lua_isstring(L, -1))
3853                         return false;
3854                 recipe.push_back(lua_tostring(L, -1));
3855                 // removes value, keeps key for next iteration
3856                 lua_pop(L, 1);
3857         }
3858         return true;
3859 }
3860
3861 // helper for register_craft
3862 static bool read_craft_replacements(lua_State *L, int index,
3863                 CraftReplacements &replacements)
3864 {
3865         if(index < 0)
3866                 index = lua_gettop(L) + 1 + index;
3867
3868         if(!lua_istable(L, index))
3869                 return false;
3870
3871         lua_pushnil(L);
3872         while(lua_next(L, index) != 0){
3873                 // key at index -2 and value at index -1
3874                 if(!lua_istable(L, -1))
3875                         return false;
3876                 lua_rawgeti(L, -1, 1);
3877                 if(!lua_isstring(L, -1))
3878                         return false;
3879                 std::string replace_from = lua_tostring(L, -1);
3880                 lua_pop(L, 1);
3881                 lua_rawgeti(L, -1, 2);
3882                 if(!lua_isstring(L, -1))
3883                         return false;
3884                 std::string replace_to = lua_tostring(L, -1);
3885                 lua_pop(L, 1);
3886                 replacements.pairs.push_back(
3887                                 std::make_pair(replace_from, replace_to));
3888                 // removes value, keeps key for next iteration
3889                 lua_pop(L, 1);
3890         }
3891         return true;
3892 }
3893 // register_craft({output=item, recipe={{item00,item10},{item01,item11}})
3894 static int l_register_craft(lua_State *L)
3895 {
3896         //infostream<<"register_craft"<<std::endl;
3897         luaL_checktype(L, 1, LUA_TTABLE);
3898         int table = 1;
3899
3900         // Get the writable craft definition manager from the server
3901         IWritableCraftDefManager *craftdef =
3902                         get_server(L)->getWritableCraftDefManager();
3903
3904         std::string type = getstringfield_default(L, table, "type", "shaped");
3905
3906         /*
3907                 CraftDefinitionShaped
3908         */
3909         if(type == "shaped"){
3910                 std::string output = getstringfield_default(L, table, "output", "");
3911                 if(output == "")
3912                         throw LuaError(L, "Crafting definition is missing an output");
3913
3914                 int width = 0;
3915                 std::vector<std::string> recipe;
3916                 lua_getfield(L, table, "recipe");
3917                 if(lua_isnil(L, -1))
3918                         throw LuaError(L, "Crafting definition is missing a recipe"
3919                                         " (output=\"" + output + "\")");
3920                 if(!read_craft_recipe_shaped(L, -1, width, recipe))
3921                         throw LuaError(L, "Invalid crafting recipe"
3922                                         " (output=\"" + output + "\")");
3923
3924                 CraftReplacements replacements;
3925                 lua_getfield(L, table, "replacements");
3926                 if(!lua_isnil(L, -1))
3927                 {
3928                         if(!read_craft_replacements(L, -1, replacements))
3929                                 throw LuaError(L, "Invalid replacements"
3930                                                 " (output=\"" + output + "\")");
3931                 }
3932
3933                 CraftDefinition *def = new CraftDefinitionShaped(
3934                                 output, width, recipe, replacements);
3935                 craftdef->registerCraft(def);
3936         }
3937         /*
3938                 CraftDefinitionShapeless
3939         */
3940         else if(type == "shapeless"){
3941                 std::string output = getstringfield_default(L, table, "output", "");
3942                 if(output == "")
3943                         throw LuaError(L, "Crafting definition (shapeless)"
3944                                         " is missing an output");
3945
3946                 std::vector<std::string> recipe;
3947                 lua_getfield(L, table, "recipe");
3948                 if(lua_isnil(L, -1))
3949                         throw LuaError(L, "Crafting definition (shapeless)"
3950                                         " is missing a recipe"
3951                                         " (output=\"" + output + "\")");
3952                 if(!read_craft_recipe_shapeless(L, -1, recipe))
3953                         throw LuaError(L, "Invalid crafting recipe"
3954                                         " (output=\"" + output + "\")");
3955
3956                 CraftReplacements replacements;
3957                 lua_getfield(L, table, "replacements");
3958                 if(!lua_isnil(L, -1))
3959                 {
3960                         if(!read_craft_replacements(L, -1, replacements))
3961                                 throw LuaError(L, "Invalid replacements"
3962                                                 " (output=\"" + output + "\")");
3963                 }
3964
3965                 CraftDefinition *def = new CraftDefinitionShapeless(
3966                                 output, recipe, replacements);
3967                 craftdef->registerCraft(def);
3968         }
3969         /*
3970                 CraftDefinitionToolRepair
3971         */
3972         else if(type == "toolrepair"){
3973                 float additional_wear = getfloatfield_default(L, table,
3974                                 "additional_wear", 0.0);
3975
3976                 CraftDefinition *def = new CraftDefinitionToolRepair(
3977                                 additional_wear);
3978                 craftdef->registerCraft(def);
3979         }
3980         /*
3981                 CraftDefinitionCooking
3982         */
3983         else if(type == "cooking"){
3984                 std::string output = getstringfield_default(L, table, "output", "");
3985                 if(output == "")
3986                         throw LuaError(L, "Crafting definition (cooking)"
3987                                         " is missing an output");
3988
3989                 std::string recipe = getstringfield_default(L, table, "recipe", "");
3990                 if(recipe == "")
3991                         throw LuaError(L, "Crafting definition (cooking)"
3992                                         " is missing a recipe"
3993                                         " (output=\"" + output + "\")");
3994
3995                 float cooktime = getfloatfield_default(L, table, "cooktime", 3.0);
3996
3997                 CraftDefinition *def = new CraftDefinitionCooking(
3998                                 output, recipe, cooktime);
3999                 craftdef->registerCraft(def);
4000         }
4001         /*
4002                 CraftDefinitionFuel
4003         */
4004         else if(type == "fuel"){
4005                 std::string recipe = getstringfield_default(L, table, "recipe", "");
4006                 if(recipe == "")
4007                         throw LuaError(L, "Crafting definition (fuel)"
4008                                         " is missing a recipe");
4009
4010                 float burntime = getfloatfield_default(L, table, "burntime", 1.0);
4011
4012                 CraftDefinition *def = new CraftDefinitionFuel(
4013                                 recipe, burntime);
4014                 craftdef->registerCraft(def);
4015         }
4016         else
4017         {
4018                 throw LuaError(L, "Unknown crafting definition type: \"" + type + "\"");
4019         }
4020
4021         lua_pop(L, 1);
4022         return 0; /* number of results */
4023 }
4024
4025 // setting_set(name, value)
4026 static int l_setting_set(lua_State *L)
4027 {
4028         const char *name = luaL_checkstring(L, 1);
4029         const char *value = luaL_checkstring(L, 2);
4030         g_settings->set(name, value);
4031         return 0;
4032 }
4033
4034 // setting_get(name)
4035 static int l_setting_get(lua_State *L)
4036 {
4037         const char *name = luaL_checkstring(L, 1);
4038         try{
4039                 std::string value = g_settings->get(name);
4040                 lua_pushstring(L, value.c_str());
4041         } catch(SettingNotFoundException &e){
4042                 lua_pushnil(L);
4043         }
4044         return 1;
4045 }
4046
4047 // setting_getbool(name)
4048 static int l_setting_getbool(lua_State *L)
4049 {
4050         const char *name = luaL_checkstring(L, 1);
4051         try{
4052                 bool value = g_settings->getBool(name);
4053                 lua_pushboolean(L, value);
4054         } catch(SettingNotFoundException &e){
4055                 lua_pushnil(L);
4056         }
4057         return 1;
4058 }
4059
4060 // chat_send_all(text)
4061 static int l_chat_send_all(lua_State *L)
4062 {
4063         const char *text = luaL_checkstring(L, 1);
4064         // Get server from registry
4065         Server *server = get_server(L);
4066         // Send
4067         server->notifyPlayers(narrow_to_wide(text));
4068         return 0;
4069 }
4070
4071 // chat_send_player(name, text)
4072 static int l_chat_send_player(lua_State *L)
4073 {
4074         const char *name = luaL_checkstring(L, 1);
4075         const char *text = luaL_checkstring(L, 2);
4076         // Get server from registry
4077         Server *server = get_server(L);
4078         // Send
4079         server->notifyPlayer(name, narrow_to_wide(text));
4080         return 0;
4081 }
4082
4083 // get_player_privs(name, text)
4084 static int l_get_player_privs(lua_State *L)
4085 {
4086         const char *name = luaL_checkstring(L, 1);
4087         // Get server from registry
4088         Server *server = get_server(L);
4089         // Do it
4090         lua_newtable(L);
4091         int table = lua_gettop(L);
4092         std::set<std::string> privs_s = server->getPlayerEffectivePrivs(name);
4093         for(std::set<std::string>::const_iterator
4094                         i = privs_s.begin(); i != privs_s.end(); i++){
4095                 lua_pushboolean(L, true);
4096                 lua_setfield(L, table, i->c_str());
4097         }
4098         lua_pushvalue(L, table);
4099         return 1;
4100 }
4101
4102 // get_inventory(location)
4103 static int l_get_inventory(lua_State *L)
4104 {
4105         InventoryLocation loc;
4106
4107         std::string type = checkstringfield(L, 1, "type");
4108         if(type == "player"){
4109                 std::string name = checkstringfield(L, 1, "name");
4110                 loc.setPlayer(name);
4111         } else if(type == "node"){
4112                 lua_getfield(L, 1, "pos");
4113                 v3s16 pos = check_v3s16(L, -1);
4114                 loc.setNodeMeta(pos);
4115         }
4116
4117         if(get_server(L)->getInventory(loc) != NULL)
4118                 InvRef::create(L, loc);
4119         else
4120                 lua_pushnil(L);
4121         return 1;
4122 }
4123
4124 // get_dig_params(groups, tool_capabilities[, time_from_last_punch])
4125 static int l_get_dig_params(lua_State *L)
4126 {
4127         std::map<std::string, int> groups;
4128         read_groups(L, 1, groups);
4129         ToolCapabilities tp = read_tool_capabilities(L, 2);
4130         if(lua_isnoneornil(L, 3))
4131                 push_dig_params(L, getDigParams(groups, &tp));
4132         else
4133                 push_dig_params(L, getDigParams(groups, &tp,
4134                                         luaL_checknumber(L, 3)));
4135         return 1;
4136 }
4137
4138 // get_hit_params(groups, tool_capabilities[, time_from_last_punch])
4139 static int l_get_hit_params(lua_State *L)
4140 {
4141         std::map<std::string, int> groups;
4142         read_groups(L, 1, groups);
4143         ToolCapabilities tp = read_tool_capabilities(L, 2);
4144         if(lua_isnoneornil(L, 3))
4145                 push_hit_params(L, getHitParams(groups, &tp));
4146         else
4147                 push_hit_params(L, getHitParams(groups, &tp,
4148                                         luaL_checknumber(L, 3)));
4149         return 1;
4150 }
4151
4152 // get_current_modname()
4153 static int l_get_current_modname(lua_State *L)
4154 {
4155         lua_getfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
4156         return 1;
4157 }
4158
4159 // get_modpath(modname)
4160 static int l_get_modpath(lua_State *L)
4161 {
4162         std::string modname = luaL_checkstring(L, 1);
4163         // Do it
4164         if(modname == "__builtin"){
4165                 std::string path = get_server(L)->getBuiltinLuaPath();
4166                 lua_pushstring(L, path.c_str());
4167                 return 1;
4168         }
4169         const ModSpec *mod = get_server(L)->getModSpec(modname);
4170         if(!mod){
4171                 lua_pushnil(L);
4172                 return 1;
4173         }
4174         lua_pushstring(L, mod->path.c_str());
4175         return 1;
4176 }
4177
4178 // get_worldpath()
4179 static int l_get_worldpath(lua_State *L)
4180 {
4181         std::string worldpath = get_server(L)->getWorldPath();
4182         lua_pushstring(L, worldpath.c_str());
4183         return 1;
4184 }
4185
4186 // sound_play(spec, parameters)
4187 static int l_sound_play(lua_State *L)
4188 {
4189         SimpleSoundSpec spec;
4190         read_soundspec(L, 1, spec);
4191         ServerSoundParams params;
4192         read_server_sound_params(L, 2, params);
4193         s32 handle = get_server(L)->playSound(spec, params);
4194         lua_pushinteger(L, handle);
4195         return 1;
4196 }
4197
4198 // sound_stop(handle)
4199 static int l_sound_stop(lua_State *L)
4200 {
4201         int handle = luaL_checkinteger(L, 1);
4202         get_server(L)->stopSound(handle);
4203         return 0;
4204 }
4205
4206 // is_singleplayer()
4207 static int l_is_singleplayer(lua_State *L)
4208 {
4209         lua_pushboolean(L, get_server(L)->isSingleplayer());
4210         return 1;
4211 }
4212
4213 // get_password_hash(name, raw_password)
4214 static int l_get_password_hash(lua_State *L)
4215 {
4216         std::string name = luaL_checkstring(L, 1);
4217         std::string raw_password = luaL_checkstring(L, 2);
4218         std::string hash = translatePassword(name,
4219                         narrow_to_wide(raw_password));
4220         lua_pushstring(L, hash.c_str());
4221         return 1;
4222 }
4223
4224 // notify_authentication_modified(name)
4225 static int l_notify_authentication_modified(lua_State *L)
4226 {
4227         std::string name = "";
4228         if(lua_isstring(L, 1))
4229                 name = lua_tostring(L, 1);
4230         get_server(L)->reportPrivsModified(name);
4231         return 0;
4232 }
4233
4234 static const struct luaL_Reg minetest_f [] = {
4235         {"debug", l_debug},
4236         {"log", l_log},
4237         {"register_item_raw", l_register_item_raw},
4238         {"register_alias_raw", l_register_alias_raw},
4239         {"register_craft", l_register_craft},
4240         {"setting_set", l_setting_set},
4241         {"setting_get", l_setting_get},
4242         {"setting_getbool", l_setting_getbool},
4243         {"chat_send_all", l_chat_send_all},
4244         {"chat_send_player", l_chat_send_player},
4245         {"get_player_privs", l_get_player_privs},
4246         {"get_inventory", l_get_inventory},
4247         {"get_dig_params", l_get_dig_params},
4248         {"get_hit_params", l_get_hit_params},
4249         {"get_current_modname", l_get_current_modname},
4250         {"get_modpath", l_get_modpath},
4251         {"get_worldpath", l_get_worldpath},
4252         {"sound_play", l_sound_play},
4253         {"sound_stop", l_sound_stop},
4254         {"is_singleplayer", l_is_singleplayer},
4255         {"get_password_hash", l_get_password_hash},
4256         {"notify_authentication_modified", l_notify_authentication_modified},
4257         {NULL, NULL}
4258 };
4259
4260 /*
4261         Main export function
4262 */
4263
4264 void scriptapi_export(lua_State *L, Server *server)
4265 {
4266         realitycheck(L);
4267         assert(lua_checkstack(L, 20));
4268         verbosestream<<"scriptapi_export()"<<std::endl;
4269         StackUnroller stack_unroller(L);
4270
4271         // Store server as light userdata in registry
4272         lua_pushlightuserdata(L, server);
4273         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_server");
4274
4275         // Register global functions in table minetest
4276         lua_newtable(L);
4277         luaL_register(L, NULL, minetest_f);
4278         lua_setglobal(L, "minetest");
4279
4280         // Get the main minetest table
4281         lua_getglobal(L, "minetest");
4282
4283         // Add tables to minetest
4284
4285         lua_newtable(L);
4286         lua_setfield(L, -2, "object_refs");
4287         lua_newtable(L);
4288         lua_setfield(L, -2, "luaentities");
4289
4290         // Register wrappers
4291         LuaItemStack::Register(L);
4292         InvRef::Register(L);
4293         NodeMetaRef::Register(L);
4294         ObjectRef::Register(L);
4295         EnvRef::Register(L);
4296         LuaPseudoRandom::Register(L);
4297         LuaPerlinNoise::Register(L);
4298 }
4299
4300 bool scriptapi_loadmod(lua_State *L, const std::string &scriptpath,
4301                 const std::string &modname)
4302 {
4303         ModNameStorer modnamestorer(L, modname);
4304
4305         if(!string_allowed(modname, "abcdefghijklmnopqrstuvwxyz"
4306                         "0123456789_")){
4307                 errorstream<<"Error loading mod \""<<modname
4308                                 <<"\": modname does not follow naming conventions: "
4309                                 <<"Only chararacters [a-z0-9_] are allowed."<<std::endl;
4310                 return false;
4311         }
4312
4313         bool success = false;
4314
4315         try{
4316                 success = script_load(L, scriptpath.c_str());
4317         }
4318         catch(LuaError &e){
4319                 errorstream<<"Error loading mod \""<<modname
4320                                 <<"\": "<<e.what()<<std::endl;
4321         }
4322
4323         return success;
4324 }
4325
4326 void scriptapi_add_environment(lua_State *L, ServerEnvironment *env)
4327 {
4328         realitycheck(L);
4329         assert(lua_checkstack(L, 20));
4330         verbosestream<<"scriptapi_add_environment"<<std::endl;
4331         StackUnroller stack_unroller(L);
4332
4333         // Create EnvRef on stack
4334         EnvRef::create(L, env);
4335         int envref = lua_gettop(L);
4336
4337         // minetest.env = envref
4338         lua_getglobal(L, "minetest");
4339         luaL_checktype(L, -1, LUA_TTABLE);
4340         lua_pushvalue(L, envref);
4341         lua_setfield(L, -2, "env");
4342
4343         // Store environment as light userdata in registry
4344         lua_pushlightuserdata(L, env);
4345         lua_setfield(L, LUA_REGISTRYINDEX, "minetest_env");
4346
4347         /*
4348                 Add ActiveBlockModifiers to environment
4349         */
4350
4351         // Get minetest.registered_abms
4352         lua_getglobal(L, "minetest");
4353         lua_getfield(L, -1, "registered_abms");
4354         luaL_checktype(L, -1, LUA_TTABLE);
4355         int registered_abms = lua_gettop(L);
4356
4357         if(lua_istable(L, registered_abms)){
4358                 int table = lua_gettop(L);
4359                 lua_pushnil(L);
4360                 while(lua_next(L, table) != 0){
4361                         // key at index -2 and value at index -1
4362                         int id = lua_tonumber(L, -2);
4363                         int current_abm = lua_gettop(L);
4364
4365                         std::set<std::string> trigger_contents;
4366                         lua_getfield(L, current_abm, "nodenames");
4367                         if(lua_istable(L, -1)){
4368                                 int table = lua_gettop(L);
4369                                 lua_pushnil(L);
4370                                 while(lua_next(L, table) != 0){
4371                                         // key at index -2 and value at index -1
4372                                         luaL_checktype(L, -1, LUA_TSTRING);
4373                                         trigger_contents.insert(lua_tostring(L, -1));
4374                                         // removes value, keeps key for next iteration
4375                                         lua_pop(L, 1);
4376                                 }
4377                         } else if(lua_isstring(L, -1)){
4378                                 trigger_contents.insert(lua_tostring(L, -1));
4379                         }
4380                         lua_pop(L, 1);
4381
4382                         std::set<std::string> required_neighbors;
4383                         lua_getfield(L, current_abm, "neighbors");
4384                         if(lua_istable(L, -1)){
4385                                 int table = lua_gettop(L);
4386                                 lua_pushnil(L);
4387                                 while(lua_next(L, table) != 0){
4388                                         // key at index -2 and value at index -1
4389                                         luaL_checktype(L, -1, LUA_TSTRING);
4390                                         required_neighbors.insert(lua_tostring(L, -1));
4391                                         // removes value, keeps key for next iteration
4392                                         lua_pop(L, 1);
4393                                 }
4394                         } else if(lua_isstring(L, -1)){
4395                                 required_neighbors.insert(lua_tostring(L, -1));
4396                         }
4397                         lua_pop(L, 1);
4398
4399                         float trigger_interval = 10.0;
4400                         getfloatfield(L, current_abm, "interval", trigger_interval);
4401
4402                         int trigger_chance = 50;
4403                         getintfield(L, current_abm, "chance", trigger_chance);
4404
4405                         LuaABM *abm = new LuaABM(L, id, trigger_contents,
4406                                         required_neighbors, trigger_interval, trigger_chance);
4407
4408                         env->addActiveBlockModifier(abm);
4409
4410                         // removes value, keeps key for next iteration
4411                         lua_pop(L, 1);
4412                 }
4413         }
4414         lua_pop(L, 1);
4415 }
4416
4417 #if 0
4418 // Dump stack top with the dump2 function
4419 static void dump2(lua_State *L, const char *name)
4420 {
4421         // Dump object (debug)
4422         lua_getglobal(L, "dump2");
4423         luaL_checktype(L, -1, LUA_TFUNCTION);
4424         lua_pushvalue(L, -2); // Get previous stack top as first parameter
4425         lua_pushstring(L, name);
4426         if(lua_pcall(L, 2, 0, 0))
4427                 script_error(L, "error: %s", lua_tostring(L, -1));
4428 }
4429 #endif
4430
4431 /*
4432         object_reference
4433 */
4434
4435 void scriptapi_add_object_reference(lua_State *L, ServerActiveObject *cobj)
4436 {
4437         realitycheck(L);
4438         assert(lua_checkstack(L, 20));
4439         //infostream<<"scriptapi_add_object_reference: id="<<cobj->getId()<<std::endl;
4440         StackUnroller stack_unroller(L);
4441
4442         // Create object on stack
4443         ObjectRef::create(L, cobj); // Puts ObjectRef (as userdata) on stack
4444         int object = lua_gettop(L);
4445
4446         // Get minetest.object_refs table
4447         lua_getglobal(L, "minetest");
4448         lua_getfield(L, -1, "object_refs");
4449         luaL_checktype(L, -1, LUA_TTABLE);
4450         int objectstable = lua_gettop(L);
4451
4452         // object_refs[id] = object
4453         lua_pushnumber(L, cobj->getId()); // Push id
4454         lua_pushvalue(L, object); // Copy object to top of stack
4455         lua_settable(L, objectstable);
4456 }
4457
4458 void scriptapi_rm_object_reference(lua_State *L, ServerActiveObject *cobj)
4459 {
4460         realitycheck(L);
4461         assert(lua_checkstack(L, 20));
4462         //infostream<<"scriptapi_rm_object_reference: id="<<cobj->getId()<<std::endl;
4463         StackUnroller stack_unroller(L);
4464
4465         // Get minetest.object_refs table
4466         lua_getglobal(L, "minetest");
4467         lua_getfield(L, -1, "object_refs");
4468         luaL_checktype(L, -1, LUA_TTABLE);
4469         int objectstable = lua_gettop(L);
4470
4471         // Get object_refs[id]
4472         lua_pushnumber(L, cobj->getId()); // Push id
4473         lua_gettable(L, objectstable);
4474         // Set object reference to NULL
4475         ObjectRef::set_null(L);
4476         lua_pop(L, 1); // pop object
4477
4478         // Set object_refs[id] = nil
4479         lua_pushnumber(L, cobj->getId()); // Push id
4480         lua_pushnil(L);
4481         lua_settable(L, objectstable);
4482 }
4483
4484 /*
4485         misc
4486 */
4487
4488 // What scriptapi_run_callbacks does with the return values of callbacks.
4489 // Regardless of the mode, if only one callback is defined,
4490 // its return value is the total return value.
4491 // Modes only affect the case where 0 or >= 2 callbacks are defined.
4492 enum RunCallbacksMode
4493 {
4494         // Returns the return value of the first callback
4495         // Returns nil if list of callbacks is empty
4496         RUN_CALLBACKS_MODE_FIRST,
4497         // Returns the return value of the last callback
4498         // Returns nil if list of callbacks is empty
4499         RUN_CALLBACKS_MODE_LAST,
4500         // If any callback returns a false value, the first such is returned
4501         // Otherwise, the first callback's return value (trueish) is returned
4502         // Returns true if list of callbacks is empty
4503         RUN_CALLBACKS_MODE_AND,
4504         // Like above, but stops calling callbacks (short circuit)
4505         // after seeing the first false value
4506         RUN_CALLBACKS_MODE_AND_SC,
4507         // If any callback returns a true value, the first such is returned
4508         // Otherwise, the first callback's return value (falseish) is returned
4509         // Returns false if list of callbacks is empty
4510         RUN_CALLBACKS_MODE_OR,
4511         // Like above, but stops calling callbacks (short circuit)
4512         // after seeing the first true value
4513         RUN_CALLBACKS_MODE_OR_SC,
4514         // Note: "a true value" and "a false value" refer to values that
4515         // are converted by lua_toboolean to true or false, respectively.
4516 };
4517
4518 // Push the list of callbacks (a lua table).
4519 // Then push nargs arguments.
4520 // Then call this function, which
4521 // - runs the callbacks
4522 // - removes the table and arguments from the lua stack
4523 // - pushes the return value, computed depending on mode
4524 static void scriptapi_run_callbacks(lua_State *L, int nargs,
4525                 RunCallbacksMode mode)
4526 {
4527         // Insert the return value into the lua stack, below the table
4528         assert(lua_gettop(L) >= nargs + 1);
4529         lua_pushnil(L);
4530         lua_insert(L, -(nargs + 1) - 1);
4531         // Stack now looks like this:
4532         // ... <return value = nil> <table> <arg#1> <arg#2> ... <arg#n>
4533
4534         int rv = lua_gettop(L) - nargs - 1;
4535         int table = rv + 1;
4536         int arg = table + 1;
4537
4538         luaL_checktype(L, table, LUA_TTABLE);
4539
4540         // Foreach
4541         lua_pushnil(L);
4542         bool first_loop = true;
4543         while(lua_next(L, table) != 0){
4544                 // key at index -2 and value at index -1
4545                 luaL_checktype(L, -1, LUA_TFUNCTION);
4546                 // Call function
4547                 for(int i = 0; i < nargs; i++)
4548                         lua_pushvalue(L, arg+i);
4549                 if(lua_pcall(L, nargs, 1, 0))
4550                         script_error(L, "error: %s", lua_tostring(L, -1));
4551
4552                 // Move return value to designated space in stack
4553                 // Or pop it
4554                 if(first_loop){
4555                         // Result of first callback is always moved
4556                         lua_replace(L, rv);
4557                         first_loop = false;
4558                 } else {
4559                         // Otherwise, what happens depends on the mode
4560                         if(mode == RUN_CALLBACKS_MODE_FIRST)
4561                                 lua_pop(L, 1);
4562                         else if(mode == RUN_CALLBACKS_MODE_LAST)
4563                                 lua_replace(L, rv);
4564                         else if(mode == RUN_CALLBACKS_MODE_AND ||
4565                                         mode == RUN_CALLBACKS_MODE_AND_SC){
4566                                 if(lua_toboolean(L, rv) == true &&
4567                                                 lua_toboolean(L, -1) == false)
4568                                         lua_replace(L, rv);
4569                                 else
4570                                         lua_pop(L, 1);
4571                         }
4572                         else if(mode == RUN_CALLBACKS_MODE_OR ||
4573                                         mode == RUN_CALLBACKS_MODE_OR_SC){
4574                                 if(lua_toboolean(L, rv) == false &&
4575                                                 lua_toboolean(L, -1) == true)
4576                                         lua_replace(L, rv);
4577                                 else
4578                                         lua_pop(L, 1);
4579                         }
4580                         else
4581                                 assert(0);
4582                 }
4583
4584                 // Handle short circuit modes
4585                 if(mode == RUN_CALLBACKS_MODE_AND_SC &&
4586                                 lua_toboolean(L, rv) == false)
4587                         break;
4588                 else if(mode == RUN_CALLBACKS_MODE_OR_SC &&
4589                                 lua_toboolean(L, rv) == true)
4590                         break;
4591
4592                 // value removed, keep key for next iteration
4593         }
4594
4595         // Remove stuff from stack, leaving only the return value
4596         lua_settop(L, rv);
4597
4598         // Fix return value in case no callbacks were called
4599         if(first_loop){
4600                 if(mode == RUN_CALLBACKS_MODE_AND ||
4601                                 mode == RUN_CALLBACKS_MODE_AND_SC){
4602                         lua_pop(L, 1);
4603                         lua_pushboolean(L, true);
4604                 }
4605                 else if(mode == RUN_CALLBACKS_MODE_OR ||
4606                                 mode == RUN_CALLBACKS_MODE_OR_SC){
4607                         lua_pop(L, 1);
4608                         lua_pushboolean(L, false);
4609                 }
4610         }
4611 }
4612
4613 bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
4614                 const std::string &message)
4615 {
4616         realitycheck(L);
4617         assert(lua_checkstack(L, 20));
4618         StackUnroller stack_unroller(L);
4619
4620         // Get minetest.registered_on_chat_messages
4621         lua_getglobal(L, "minetest");
4622         lua_getfield(L, -1, "registered_on_chat_messages");
4623         // Call callbacks
4624         lua_pushstring(L, name.c_str());
4625         lua_pushstring(L, message.c_str());
4626         scriptapi_run_callbacks(L, 2, RUN_CALLBACKS_MODE_OR_SC);
4627         bool ate = lua_toboolean(L, -1);
4628         return ate;
4629 }
4630
4631 void scriptapi_on_newplayer(lua_State *L, ServerActiveObject *player)
4632 {
4633         realitycheck(L);
4634         assert(lua_checkstack(L, 20));
4635         StackUnroller stack_unroller(L);
4636
4637         // Get minetest.registered_on_newplayers
4638         lua_getglobal(L, "minetest");
4639         lua_getfield(L, -1, "registered_on_newplayers");
4640         // Call callbacks
4641         objectref_get_or_create(L, player);
4642         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4643 }
4644
4645 void scriptapi_on_dieplayer(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_dieplayers
4652         lua_getglobal(L, "minetest");
4653         lua_getfield(L, -1, "registered_on_dieplayers");
4654         // Call callbacks
4655         objectref_get_or_create(L, player);
4656         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4657 }
4658
4659 bool scriptapi_on_respawnplayer(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_respawnplayers
4666         lua_getglobal(L, "minetest");
4667         lua_getfield(L, -1, "registered_on_respawnplayers");
4668         // Call callbacks
4669         objectref_get_or_create(L, player);
4670         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_OR);
4671         bool positioning_handled_by_some = lua_toboolean(L, -1);
4672         return positioning_handled_by_some;
4673 }
4674
4675 void scriptapi_on_joinplayer(lua_State *L, ServerActiveObject *player)
4676 {
4677         realitycheck(L);
4678         assert(lua_checkstack(L, 20));
4679         StackUnroller stack_unroller(L);
4680
4681         // Get minetest.registered_on_joinplayers
4682         lua_getglobal(L, "minetest");
4683         lua_getfield(L, -1, "registered_on_joinplayers");
4684         // Call callbacks
4685         objectref_get_or_create(L, player);
4686         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4687 }
4688
4689 void scriptapi_on_leaveplayer(lua_State *L, ServerActiveObject *player)
4690 {
4691         realitycheck(L);
4692         assert(lua_checkstack(L, 20));
4693         StackUnroller stack_unroller(L);
4694
4695         // Get minetest.registered_on_leaveplayers
4696         lua_getglobal(L, "minetest");
4697         lua_getfield(L, -1, "registered_on_leaveplayers");
4698         // Call callbacks
4699         objectref_get_or_create(L, player);
4700         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4701 }
4702
4703 void scriptapi_get_creative_inventory(lua_State *L, ServerActiveObject *player)
4704 {
4705         realitycheck(L);
4706         assert(lua_checkstack(L, 20));
4707         StackUnroller stack_unroller(L);
4708
4709         Inventory *inv = player->getInventory();
4710         assert(inv);
4711
4712         lua_getglobal(L, "minetest");
4713         lua_getfield(L, -1, "creative_inventory");
4714         luaL_checktype(L, -1, LUA_TTABLE);
4715         inventory_set_list_from_lua(inv, "main", L, -1, PLAYER_INVENTORY_SIZE);
4716 }
4717
4718 static void get_auth_handler(lua_State *L)
4719 {
4720         lua_getglobal(L, "minetest");
4721         lua_getfield(L, -1, "registered_auth_handler");
4722         if(lua_isnil(L, -1)){
4723                 lua_pop(L, 1);
4724                 lua_getfield(L, -1, "builtin_auth_handler");
4725         }
4726         if(lua_type(L, -1) != LUA_TTABLE)
4727                 throw LuaError(L, "Authentication handler table not valid");
4728 }
4729
4730 bool scriptapi_get_auth(lua_State *L, const std::string &playername,
4731                 std::string *dst_password, std::set<std::string> *dst_privs)
4732 {
4733         realitycheck(L);
4734         assert(lua_checkstack(L, 20));
4735         StackUnroller stack_unroller(L);
4736
4737         get_auth_handler(L);
4738         lua_getfield(L, -1, "get_auth");
4739         if(lua_type(L, -1) != LUA_TFUNCTION)
4740                 throw LuaError(L, "Authentication handler missing get_auth");
4741         lua_pushstring(L, playername.c_str());
4742         if(lua_pcall(L, 1, 1, 0))
4743                 script_error(L, "error: %s", lua_tostring(L, -1));
4744
4745         // nil = login not allowed
4746         if(lua_isnil(L, -1))
4747                 return false;
4748         luaL_checktype(L, -1, LUA_TTABLE);
4749
4750         std::string password;
4751         bool found = getstringfield(L, -1, "password", password);
4752         if(!found)
4753                 throw LuaError(L, "Authentication handler didn't return password");
4754         if(dst_password)
4755                 *dst_password = password;
4756
4757         lua_getfield(L, -1, "privileges");
4758         if(!lua_istable(L, -1))
4759                 throw LuaError(L,
4760                                 "Authentication handler didn't return privilege table");
4761         if(dst_privs)
4762                 read_privileges(L, -1, *dst_privs);
4763         lua_pop(L, 1);
4764
4765         return true;
4766 }
4767
4768 void scriptapi_create_auth(lua_State *L, const std::string &playername,
4769                 const std::string &password)
4770 {
4771         realitycheck(L);
4772         assert(lua_checkstack(L, 20));
4773         StackUnroller stack_unroller(L);
4774
4775         get_auth_handler(L);
4776         lua_getfield(L, -1, "create_auth");
4777         if(lua_type(L, -1) != LUA_TFUNCTION)
4778                 throw LuaError(L, "Authentication handler missing create_auth");
4779         lua_pushstring(L, playername.c_str());
4780         lua_pushstring(L, password.c_str());
4781         if(lua_pcall(L, 2, 0, 0))
4782                 script_error(L, "error: %s", lua_tostring(L, -1));
4783 }
4784
4785 bool scriptapi_set_password(lua_State *L, const std::string &playername,
4786                 const std::string &password)
4787 {
4788         realitycheck(L);
4789         assert(lua_checkstack(L, 20));
4790         StackUnroller stack_unroller(L);
4791
4792         get_auth_handler(L);
4793         lua_getfield(L, -1, "set_password");
4794         if(lua_type(L, -1) != LUA_TFUNCTION)
4795                 throw LuaError(L, "Authentication handler missing set_password");
4796         lua_pushstring(L, playername.c_str());
4797         lua_pushstring(L, password.c_str());
4798         if(lua_pcall(L, 2, 1, 0))
4799                 script_error(L, "error: %s", lua_tostring(L, -1));
4800         return lua_toboolean(L, -1);
4801 }
4802
4803 /*
4804         item callbacks and node callbacks
4805 */
4806
4807 // Retrieves minetest.registered_items[name][callbackname]
4808 // If that is nil or on error, return false and stack is unchanged
4809 // If that is a function, returns true and pushes the
4810 // function onto the stack
4811 static bool get_item_callback(lua_State *L,
4812                 const char *name, const char *callbackname)
4813 {
4814         lua_getglobal(L, "minetest");
4815         lua_getfield(L, -1, "registered_items");
4816         lua_remove(L, -2);
4817         luaL_checktype(L, -1, LUA_TTABLE);
4818         lua_getfield(L, -1, name);
4819         lua_remove(L, -2);
4820         // Should be a table
4821         if(lua_type(L, -1) != LUA_TTABLE)
4822         {
4823                 errorstream<<"Item \""<<name<<"\" not defined"<<std::endl;
4824                 lua_pop(L, 1);
4825                 return false;
4826         }
4827         lua_getfield(L, -1, callbackname);
4828         lua_remove(L, -2);
4829         // Should be a function or nil
4830         if(lua_type(L, -1) == LUA_TFUNCTION)
4831         {
4832                 return true;
4833         }
4834         else if(lua_isnil(L, -1))
4835         {
4836                 lua_pop(L, 1);
4837                 return false;
4838         }
4839         else
4840         {
4841                 errorstream<<"Item \""<<name<<"\" callback \""
4842                         <<callbackname<<" is not a function"<<std::endl;
4843                 lua_pop(L, 1);
4844                 return false;
4845         }
4846 }
4847
4848 bool scriptapi_item_on_drop(lua_State *L, ItemStack &item,
4849                 ServerActiveObject *dropper, v3f pos)
4850 {
4851         realitycheck(L);
4852         assert(lua_checkstack(L, 20));
4853         StackUnroller stack_unroller(L);
4854
4855         // Push callback function on stack
4856         if(!get_item_callback(L, item.name.c_str(), "on_drop"))
4857                 return false;
4858
4859         // Call function
4860         LuaItemStack::create(L, item);
4861         objectref_get_or_create(L, dropper);
4862         pushFloatPos(L, pos);
4863         if(lua_pcall(L, 3, 1, 0))
4864                 script_error(L, "error: %s", lua_tostring(L, -1));
4865         if(!lua_isnil(L, -1))
4866                 item = read_item(L, -1);
4867         return true;
4868 }
4869
4870 bool scriptapi_item_on_place(lua_State *L, ItemStack &item,
4871                 ServerActiveObject *placer, const PointedThing &pointed)
4872 {
4873         realitycheck(L);
4874         assert(lua_checkstack(L, 20));
4875         StackUnroller stack_unroller(L);
4876
4877         // Push callback function on stack
4878         if(!get_item_callback(L, item.name.c_str(), "on_place"))
4879                 return false;
4880
4881         // Call function
4882         LuaItemStack::create(L, item);
4883         objectref_get_or_create(L, placer);
4884         push_pointed_thing(L, pointed);
4885         if(lua_pcall(L, 3, 1, 0))
4886                 script_error(L, "error: %s", lua_tostring(L, -1));
4887         if(!lua_isnil(L, -1))
4888                 item = read_item(L, -1);
4889         return true;
4890 }
4891
4892 bool scriptapi_item_on_use(lua_State *L, ItemStack &item,
4893                 ServerActiveObject *user, const PointedThing &pointed)
4894 {
4895         realitycheck(L);
4896         assert(lua_checkstack(L, 20));
4897         StackUnroller stack_unroller(L);
4898
4899         // Push callback function on stack
4900         if(!get_item_callback(L, item.name.c_str(), "on_use"))
4901                 return false;
4902
4903         // Call function
4904         LuaItemStack::create(L, item);
4905         objectref_get_or_create(L, user);
4906         push_pointed_thing(L, pointed);
4907         if(lua_pcall(L, 3, 1, 0))
4908                 script_error(L, "error: %s", lua_tostring(L, -1));
4909         if(!lua_isnil(L, -1))
4910                 item = read_item(L, -1);
4911         return true;
4912 }
4913
4914 bool scriptapi_node_on_punch(lua_State *L, v3s16 pos, MapNode node,
4915                 ServerActiveObject *puncher)
4916 {
4917         realitycheck(L);
4918         assert(lua_checkstack(L, 20));
4919         StackUnroller stack_unroller(L);
4920
4921         INodeDefManager *ndef = get_server(L)->ndef();
4922
4923         // Push callback function on stack
4924         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_punch"))
4925                 return false;
4926
4927         // Call function
4928         push_v3s16(L, pos);
4929         pushnode(L, node, ndef);
4930         objectref_get_or_create(L, puncher);
4931         if(lua_pcall(L, 3, 0, 0))
4932                 script_error(L, "error: %s", lua_tostring(L, -1));
4933         return true;
4934 }
4935
4936 bool scriptapi_node_on_dig(lua_State *L, v3s16 pos, MapNode node,
4937                 ServerActiveObject *digger)
4938 {
4939         realitycheck(L);
4940         assert(lua_checkstack(L, 20));
4941         StackUnroller stack_unroller(L);
4942
4943         INodeDefManager *ndef = get_server(L)->ndef();
4944
4945         // Push callback function on stack
4946         if(!get_item_callback(L, ndef->get(node).name.c_str(), "on_dig"))
4947                 return false;
4948
4949         // Call function
4950         push_v3s16(L, pos);
4951         pushnode(L, node, ndef);
4952         objectref_get_or_create(L, digger);
4953         if(lua_pcall(L, 3, 0, 0))
4954                 script_error(L, "error: %s", lua_tostring(L, -1));
4955         return true;
4956 }
4957
4958 /*
4959         environment
4960 */
4961
4962 void scriptapi_environment_step(lua_State *L, float dtime)
4963 {
4964         realitycheck(L);
4965         assert(lua_checkstack(L, 20));
4966         //infostream<<"scriptapi_environment_step"<<std::endl;
4967         StackUnroller stack_unroller(L);
4968
4969         // Get minetest.registered_globalsteps
4970         lua_getglobal(L, "minetest");
4971         lua_getfield(L, -1, "registered_globalsteps");
4972         // Call callbacks
4973         lua_pushnumber(L, dtime);
4974         scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
4975 }
4976
4977 void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp,
4978                 u32 blockseed)
4979 {
4980         realitycheck(L);
4981         assert(lua_checkstack(L, 20));
4982         //infostream<<"scriptapi_environment_on_generated"<<std::endl;
4983         StackUnroller stack_unroller(L);
4984
4985         // Get minetest.registered_on_generateds
4986         lua_getglobal(L, "minetest");
4987         lua_getfield(L, -1, "registered_on_generateds");
4988         // Call callbacks
4989         push_v3s16(L, minp);
4990         push_v3s16(L, maxp);
4991         lua_pushnumber(L, blockseed);
4992         scriptapi_run_callbacks(L, 3, RUN_CALLBACKS_MODE_FIRST);
4993 }
4994
4995 /*
4996         luaentity
4997 */
4998
4999 bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name)
5000 {
5001         realitycheck(L);
5002         assert(lua_checkstack(L, 20));
5003         verbosestream<<"scriptapi_luaentity_add: id="<<id<<" name=\""
5004                         <<name<<"\""<<std::endl;
5005         StackUnroller stack_unroller(L);
5006
5007         // Get minetest.registered_entities[name]
5008         lua_getglobal(L, "minetest");
5009         lua_getfield(L, -1, "registered_entities");
5010         luaL_checktype(L, -1, LUA_TTABLE);
5011         lua_pushstring(L, name);
5012         lua_gettable(L, -2);
5013         // Should be a table, which we will use as a prototype
5014         //luaL_checktype(L, -1, LUA_TTABLE);
5015         if(lua_type(L, -1) != LUA_TTABLE){
5016                 errorstream<<"LuaEntity name \""<<name<<"\" not defined"<<std::endl;
5017                 return false;
5018         }
5019         int prototype_table = lua_gettop(L);
5020         //dump2(L, "prototype_table");
5021
5022         // Create entity object
5023         lua_newtable(L);
5024         int object = lua_gettop(L);
5025
5026         // Set object metatable
5027         lua_pushvalue(L, prototype_table);
5028         lua_setmetatable(L, -2);
5029
5030         // Add object reference
5031         // This should be userdata with metatable ObjectRef
5032         objectref_get(L, id);
5033         luaL_checktype(L, -1, LUA_TUSERDATA);
5034         if(!luaL_checkudata(L, -1, "ObjectRef"))
5035                 luaL_typerror(L, -1, "ObjectRef");
5036         lua_setfield(L, -2, "object");
5037
5038         // minetest.luaentities[id] = object
5039         lua_getglobal(L, "minetest");
5040         lua_getfield(L, -1, "luaentities");
5041         luaL_checktype(L, -1, LUA_TTABLE);
5042         lua_pushnumber(L, id); // Push id
5043         lua_pushvalue(L, object); // Copy object to top of stack
5044         lua_settable(L, -3);
5045
5046         return true;
5047 }
5048
5049 void scriptapi_luaentity_activate(lua_State *L, u16 id,
5050                 const std::string &staticdata)
5051 {
5052         realitycheck(L);
5053         assert(lua_checkstack(L, 20));
5054         verbosestream<<"scriptapi_luaentity_activate: id="<<id<<std::endl;
5055         StackUnroller stack_unroller(L);
5056
5057         // Get minetest.luaentities[id]
5058         luaentity_get(L, id);
5059         int object = lua_gettop(L);
5060
5061         // Get on_activate function
5062         lua_pushvalue(L, object);
5063         lua_getfield(L, -1, "on_activate");
5064         if(!lua_isnil(L, -1)){
5065                 luaL_checktype(L, -1, LUA_TFUNCTION);
5066                 lua_pushvalue(L, object); // self
5067                 lua_pushlstring(L, staticdata.c_str(), staticdata.size());
5068                 // Call with 2 arguments, 0 results
5069                 if(lua_pcall(L, 2, 0, 0))
5070                         script_error(L, "error running function on_activate: %s\n",
5071                                         lua_tostring(L, -1));
5072         }
5073 }
5074
5075 void scriptapi_luaentity_rm(lua_State *L, u16 id)
5076 {
5077         realitycheck(L);
5078         assert(lua_checkstack(L, 20));
5079         verbosestream<<"scriptapi_luaentity_rm: id="<<id<<std::endl;
5080
5081         // Get minetest.luaentities table
5082         lua_getglobal(L, "minetest");
5083         lua_getfield(L, -1, "luaentities");
5084         luaL_checktype(L, -1, LUA_TTABLE);
5085         int objectstable = lua_gettop(L);
5086
5087         // Set luaentities[id] = nil
5088         lua_pushnumber(L, id); // Push id
5089         lua_pushnil(L);
5090         lua_settable(L, objectstable);
5091
5092         lua_pop(L, 2); // pop luaentities, minetest
5093 }
5094
5095 std::string scriptapi_luaentity_get_staticdata(lua_State *L, u16 id)
5096 {
5097         realitycheck(L);
5098         assert(lua_checkstack(L, 20));
5099         //infostream<<"scriptapi_luaentity_get_staticdata: 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         // Get get_staticdata function
5107         lua_pushvalue(L, object);
5108         lua_getfield(L, -1, "get_staticdata");
5109         if(lua_isnil(L, -1))
5110                 return "";
5111
5112         luaL_checktype(L, -1, LUA_TFUNCTION);
5113         lua_pushvalue(L, object); // self
5114         // Call with 1 arguments, 1 results
5115         if(lua_pcall(L, 1, 1, 0))
5116                 script_error(L, "error running function get_staticdata: %s\n",
5117                                 lua_tostring(L, -1));
5118
5119         size_t len=0;
5120         const char *s = lua_tolstring(L, -1, &len);
5121         return std::string(s, len);
5122 }
5123
5124 void scriptapi_luaentity_get_properties(lua_State *L, u16 id,
5125                 ObjectProperties *prop)
5126 {
5127         realitycheck(L);
5128         assert(lua_checkstack(L, 20));
5129         //infostream<<"scriptapi_luaentity_get_properties: id="<<id<<std::endl;
5130         StackUnroller stack_unroller(L);
5131
5132         // Get minetest.luaentities[id]
5133         luaentity_get(L, id);
5134         //int object = lua_gettop(L);
5135
5136         // Set default values that differ from ObjectProperties defaults
5137         prop->hp_max = 10;
5138
5139         // Deprecated: read object properties directly
5140         read_object_properties(L, -1, prop);
5141
5142         // Read initial_properties
5143         lua_getfield(L, -1, "initial_properties");
5144         read_object_properties(L, -1, prop);
5145         lua_pop(L, 1);
5146 }
5147
5148 void scriptapi_luaentity_step(lua_State *L, u16 id, float dtime)
5149 {
5150         realitycheck(L);
5151         assert(lua_checkstack(L, 20));
5152         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5153         StackUnroller stack_unroller(L);
5154
5155         // Get minetest.luaentities[id]
5156         luaentity_get(L, id);
5157         int object = lua_gettop(L);
5158         // State: object is at top of stack
5159         // Get step function
5160         lua_getfield(L, -1, "on_step");
5161         if(lua_isnil(L, -1))
5162                 return;
5163         luaL_checktype(L, -1, LUA_TFUNCTION);
5164         lua_pushvalue(L, object); // self
5165         lua_pushnumber(L, dtime); // dtime
5166         // Call with 2 arguments, 0 results
5167         if(lua_pcall(L, 2, 0, 0))
5168                 script_error(L, "error running function 'on_step': %s\n", lua_tostring(L, -1));
5169 }
5170
5171 // Calls entity:on_punch(ObjectRef puncher, time_from_last_punch,
5172 //                       tool_capabilities, direction)
5173 void scriptapi_luaentity_punch(lua_State *L, u16 id,
5174                 ServerActiveObject *puncher, float time_from_last_punch,
5175                 const ToolCapabilities *toolcap, v3f dir)
5176 {
5177         realitycheck(L);
5178         assert(lua_checkstack(L, 20));
5179         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5180         StackUnroller stack_unroller(L);
5181
5182         // Get minetest.luaentities[id]
5183         luaentity_get(L, id);
5184         int object = lua_gettop(L);
5185         // State: object is at top of stack
5186         // Get function
5187         lua_getfield(L, -1, "on_punch");
5188         if(lua_isnil(L, -1))
5189                 return;
5190         luaL_checktype(L, -1, LUA_TFUNCTION);
5191         lua_pushvalue(L, object); // self
5192         objectref_get_or_create(L, puncher); // Clicker reference
5193         lua_pushnumber(L, time_from_last_punch);
5194         push_tool_capabilities(L, *toolcap);
5195         push_v3f(L, dir);
5196         // Call with 5 arguments, 0 results
5197         if(lua_pcall(L, 5, 0, 0))
5198                 script_error(L, "error running function 'on_punch': %s\n", lua_tostring(L, -1));
5199 }
5200
5201 // Calls entity:on_rightclick(ObjectRef clicker)
5202 void scriptapi_luaentity_rightclick(lua_State *L, u16 id,
5203                 ServerActiveObject *clicker)
5204 {
5205         realitycheck(L);
5206         assert(lua_checkstack(L, 20));
5207         //infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
5208         StackUnroller stack_unroller(L);
5209
5210         // Get minetest.luaentities[id]
5211         luaentity_get(L, id);
5212         int object = lua_gettop(L);
5213         // State: object is at top of stack
5214         // Get function
5215         lua_getfield(L, -1, "on_rightclick");
5216         if(lua_isnil(L, -1))
5217                 return;
5218         luaL_checktype(L, -1, LUA_TFUNCTION);
5219         lua_pushvalue(L, object); // self
5220         objectref_get_or_create(L, clicker); // Clicker reference
5221         // Call with 2 arguments, 0 results
5222         if(lua_pcall(L, 2, 0, 0))
5223                 script_error(L, "error running function 'on_rightclick': %s\n", lua_tostring(L, -1));
5224 }
5225