src/script/common/c_content.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19 #include "common/c_content.h"
  20 #include "common/c_converter.h"
  21 #include "common/c_types.h"
  22 #include "nodedef.h"
  23 #include "object_properties.h"
  24 #include "cpp_api/s_node.h"
  25 #include "lua_api/l_object.h"
  26 #include "lua_api/l_item.h"
  27 #include "common/c_internal.h"
  28 #include "server.h"
  29 #include "log.h"
  30 #include "tool.h"
  31 #include "serverobject.h"
  32 #include "porting.h"
  33 #include "mg_schematic.h"
  34 #include "noise.h"
  35 #include "util/pointedthing.h"
  36 #include <json/json.h>
  37
  38 struct EnumString es_TileAnimationType[] =
  39 {
  40         {TAT_NONE, "none"},
  41         {TAT_VERTICAL_FRAMES, "vertical_frames"},
  42         {TAT_SHEET_2D, "sheet_2d"},
  43         {0, NULL},
  44 };
  45
  46 /******************************************************************************/
  47 void read_item_definition(lua_State* L, int index,
  48                 const ItemDefinition &default_def, ItemDefinition &def)
  49 {
  50         if (index < 0)
  51                 index = lua_gettop(L) + 1 + index;
  52
  53         def.type = (ItemType)getenumfield(L, index, "type",
  54                         es_ItemType, ITEM_NONE);
  55         getstringfield(L, index, "name", def.name);
  56         getstringfield(L, index, "description", def.description);
  57         getstringfield(L, index, "inventory_image", def.inventory_image);
  58         getstringfield(L, index, "wield_image", def.wield_image);
  59         getstringfield(L, index, "palette", def.palette_image);
  60
  61         // Read item color.
  62         lua_getfield(L, index, "color");
  63         read_color(L, -1, &def.color);
  64         lua_pop(L, 1);
  65
  66         lua_getfield(L, index, "wield_scale");
  67         if(lua_istable(L, -1)){
  68                 def.wield_scale = check_v3f(L, -1);
  69         }
  70         lua_pop(L, 1);
  71
  72         int stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
  73         def.stack_max = rangelim(stack_max, 1, U16_MAX);
  74
  75         lua_getfield(L, index, "on_use");
  76         def.usable = lua_isfunction(L, -1);
  77         lua_pop(L, 1);
  78
  79         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
  80
  81         warn_if_field_exists(L, index, "tool_digging_properties",
  82                         "Deprecated; use tool_capabilities");
  83
  84         lua_getfield(L, index, "tool_capabilities");
  85         if(lua_istable(L, -1)){
  86                 def.tool_capabilities = new ToolCapabilities(
  87                                 read_tool_capabilities(L, -1));
  88         }
  89
  90         // If name is "" (hand), ensure there are ToolCapabilities
  91         // because it will be looked up there whenever any other item has
  92         // no ToolCapabilities
  93         if(def.name == "" && def.tool_capabilities == NULL){
  94                 def.tool_capabilities = new ToolCapabilities();
  95         }
  96
  97         lua_getfield(L, index, "groups");
  98         read_groups(L, -1, def.groups);
  99         lua_pop(L, 1);
 100
 101         lua_getfield(L, index, "sounds");
 102         if(lua_istable(L, -1)){
 103                 lua_getfield(L, -1, "place");
 104                 read_soundspec(L, -1, def.sound_place);
 105                 lua_pop(L, 1);
 106                 lua_getfield(L, -1, "place_failed");
 107                 read_soundspec(L, -1, def.sound_place_failed);
 108                 lua_pop(L, 1);
 109         }
 110         lua_pop(L, 1);
 111
 112         def.range = getfloatfield_default(L, index, "range", def.range);
 113
 114         // Client shall immediately place this node when player places the item.
 115         // Server will update the precise end result a moment later.
 116         // "" = no prediction
 117         getstringfield(L, index, "node_placement_prediction",
 118                         def.node_placement_prediction);
 119 }
 120
 121 /******************************************************************************/
 122 void push_item_definition(lua_State *L, const ItemDefinition &i)
 123 {
 124         lua_newtable(L);
 125         lua_pushstring(L, i.name.c_str());
 126         lua_setfield(L, -2, "name");
 127         lua_pushstring(L, i.description.c_str());
 128         lua_setfield(L, -2, "description");
 129 }
 130
 131 /******************************************************************************/
 132 void read_object_properties(lua_State *L, int index,
 133                 ObjectProperties *prop, IItemDefManager *idef)
 134 {
 135         if(index < 0)
 136                 index = lua_gettop(L) + 1 + index;
 137         if(!lua_istable(L, index))
 138                 return;
 139
 140         prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
 141
 142         getboolfield(L, -1, "physical", prop->physical);
 143         getboolfield(L, -1, "collide_with_objects", prop->collideWithObjects);
 144
 145         getfloatfield(L, -1, "weight", prop->weight);
 146
 147         lua_getfield(L, -1, "collisionbox");
 148         if(lua_istable(L, -1))
 149                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
 150         lua_pop(L, 1);
 151
 152         getstringfield(L, -1, "visual", prop->visual);
 153
 154         getstringfield(L, -1, "mesh", prop->mesh);
 155
 156         lua_getfield(L, -1, "visual_size");
 157         if(lua_istable(L, -1))
 158                 prop->visual_size = read_v2f(L, -1);
 159         lua_pop(L, 1);
 160
 161         lua_getfield(L, -1, "textures");
 162         if(lua_istable(L, -1)){
 163                 prop->textures.clear();
 164                 int table = lua_gettop(L);
 165                 lua_pushnil(L);
 166                 while(lua_next(L, table) != 0){
 167                         // key at index -2 and value at index -1
 168                         if(lua_isstring(L, -1))
 169                                 prop->textures.push_back(lua_tostring(L, -1));
 170                         else
 171                                 prop->textures.push_back("");
 172                         // removes value, keeps key for next iteration
 173                         lua_pop(L, 1);
 174                 }
 175         }
 176         lua_pop(L, 1);
 177
 178         lua_getfield(L, -1, "colors");
 179         if (lua_istable(L, -1)) {
 180                 int table = lua_gettop(L);
 181                 prop->colors.clear();
 182                 for (lua_pushnil(L); lua_next(L, table); lua_pop(L, 1)) {
 183                         video::SColor color(255, 255, 255, 255);
 184                         read_color(L, -1, &color);
 185                         prop->colors.push_back(color);
 186                 }
 187         }
 188         lua_pop(L, 1);
 189
 190         lua_getfield(L, -1, "spritediv");
 191         if(lua_istable(L, -1))
 192                 prop->spritediv = read_v2s16(L, -1);
 193         lua_pop(L, 1);
 194
 195         lua_getfield(L, -1, "initial_sprite_basepos");
 196         if(lua_istable(L, -1))
 197                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 198         lua_pop(L, 1);
 199
 200         getboolfield(L, -1, "is_visible", prop->is_visible);
 201         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 202         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 203         if (getfloatfield(L, -1, "stepheight", prop->stepheight))
 204                 prop->stepheight *= BS;
 205         lua_getfield(L, -1, "automatic_face_movement_dir");
 206         if (lua_isnumber(L, -1)) {
 207                 prop->automatic_face_movement_dir = true;
 208                 prop->automatic_face_movement_dir_offset = luaL_checknumber(L, -1);
 209         } else if (lua_isboolean(L, -1)) {
 210                 prop->automatic_face_movement_dir = lua_toboolean(L, -1);
 211                 prop->automatic_face_movement_dir_offset = 0.0;
 212         }
 213         lua_pop(L, 1);
 214         getboolfield(L, -1, "backface_culling", prop->backface_culling);
 215
 216         getstringfield(L, -1, "nametag", prop->nametag);
 217         lua_getfield(L, -1, "nametag_color");
 218         if (!lua_isnil(L, -1)) {
 219                 video::SColor color = prop->nametag_color;
 220                 if (read_color(L, -1, &color))
 221                         prop->nametag_color = color;
 222         }
 223         lua_pop(L, 1);
 224
 225         lua_getfield(L, -1, "automatic_face_movement_max_rotation_per_sec");
 226         if (lua_isnumber(L, -1)) {
 227                 prop->automatic_face_movement_max_rotation_per_sec = luaL_checknumber(L, -1);
 228         }
 229         lua_pop(L, 1);
 230         getstringfield(L, -1, "infotext", prop->infotext);
 231         lua_getfield(L, -1, "wield_item");
 232         if (!lua_isnil(L, -1))
 233                 prop->wield_item = read_item(L, -1, idef).getItemString();
 234         lua_pop(L, 1);
 235 }
 236
 237 /******************************************************************************/
 238 void push_object_properties(lua_State *L, ObjectProperties *prop)
 239 {
 240         lua_newtable(L);
 241         lua_pushnumber(L, prop->hp_max);
 242         lua_setfield(L, -2, "hp_max");
 243         lua_pushboolean(L, prop->physical);
 244         lua_setfield(L, -2, "physical");
 245         lua_pushboolean(L, prop->collideWithObjects);
 246         lua_setfield(L, -2, "collide_with_objects");
 247         lua_pushnumber(L, prop->weight);
 248         lua_setfield(L, -2, "weight");
 249         push_aabb3f(L, prop->collisionbox);
 250         lua_setfield(L, -2, "collisionbox");
 251         lua_pushlstring(L, prop->visual.c_str(), prop->visual.size());
 252         lua_setfield(L, -2, "visual");
 253         lua_pushlstring(L, prop->mesh.c_str(), prop->mesh.size());
 254         lua_setfield(L, -2, "mesh");
 255         push_v2f(L, prop->visual_size);
 256         lua_setfield(L, -2, "visual_size");
 257
 258         lua_newtable(L);
 259         u16 i = 1;
 260         for (std::vector<std::string>::iterator it = prop->textures.begin();
 261                         it != prop->textures.end(); ++it) {
 262                 lua_pushlstring(L, it->c_str(), it->size());
 263                 lua_rawseti(L, -2, i);
 264         }
 265         lua_setfield(L, -2, "textures");
 266
 267         lua_newtable(L);
 268         i = 1;
 269         for (std::vector<video::SColor>::iterator it = prop->colors.begin();
 270                         it != prop->colors.end(); ++it) {
 271                 push_ARGB8(L, *it);
 272                 lua_rawseti(L, -2, i);
 273         }
 274         lua_setfield(L, -2, "colors");
 275
 276         push_v2s16(L, prop->spritediv);
 277         lua_setfield(L, -2, "spritediv");
 278         push_v2s16(L, prop->initial_sprite_basepos);
 279         lua_setfield(L, -2, "initial_sprite_basepos");
 280         lua_pushboolean(L, prop->is_visible);
 281         lua_setfield(L, -2, "is_visible");
 282         lua_pushboolean(L, prop->makes_footstep_sound);
 283         lua_setfield(L, -2, "makes_footstep_sound");
 284         lua_pushnumber(L, prop->automatic_rotate);
 285         lua_setfield(L, -2, "automatic_rotate");
 286         lua_pushnumber(L, prop->stepheight / BS);
 287         lua_setfield(L, -2, "stepheight");
 288         if (prop->automatic_face_movement_dir)
 289                 lua_pushnumber(L, prop->automatic_face_movement_dir_offset);
 290         else
 291                 lua_pushboolean(L, false);
 292         lua_setfield(L, -2, "automatic_face_movement_dir");
 293         lua_pushboolean(L, prop->backface_culling);
 294         lua_setfield(L, -2, "backface_culling");
 295         lua_pushlstring(L, prop->nametag.c_str(), prop->nametag.size());
 296         lua_setfield(L, -2, "nametag");
 297         push_ARGB8(L, prop->nametag_color);
 298         lua_setfield(L, -2, "nametag_color");
 299         lua_pushnumber(L, prop->automatic_face_movement_max_rotation_per_sec);
 300         lua_setfield(L, -2, "automatic_face_movement_max_rotation_per_sec");
 301         lua_pushlstring(L, prop->infotext.c_str(), prop->infotext.size());
 302         lua_setfield(L, -2, "infotext");
 303         lua_pushlstring(L, prop->wield_item.c_str(), prop->wield_item.size());
 304         lua_setfield(L, -2, "wield_item");
 305 }
 306
 307 /******************************************************************************/
 308 TileDef read_tiledef(lua_State *L, int index, u8 drawtype)
 309 {
 310         if(index < 0)
 311                 index = lua_gettop(L) + 1 + index;
 312
 313         TileDef tiledef;
 314
 315         bool default_tiling = true;
 316         bool default_culling = true;
 317         switch (drawtype) {
 318                 case NDT_PLANTLIKE:
 319                 case NDT_FIRELIKE:
 320                         default_tiling = false;
 321                         // "break" is omitted here intentionaly, as PLANTLIKE
 322                         // FIRELIKE drawtype both should default to having
 323                         // backface_culling to false.
 324                 case NDT_MESH:
 325                 case NDT_LIQUID:
 326                         default_culling = false;
 327                         break;
 328                 default:
 329                         break;
 330         }
 331
 332         // key at index -2 and value at index
 333         if(lua_isstring(L, index)){
 334                 // "default_lava.png"
 335                 tiledef.name = lua_tostring(L, index);
 336                 tiledef.tileable_vertical = default_tiling;
 337                 tiledef.tileable_horizontal = default_tiling;
 338                 tiledef.backface_culling = default_culling;
 339         }
 340         else if(lua_istable(L, index))
 341         {
 342                 // name="default_lava.png"
 343                 tiledef.name = "";
 344                 getstringfield(L, index, "name", tiledef.name);
 345                 getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
 346                 tiledef.backface_culling = getboolfield_default(
 347                         L, index, "backface_culling", default_culling);
 348                 tiledef.tileable_horizontal = getboolfield_default(
 349                         L, index, "tileable_horizontal", default_tiling);
 350                 tiledef.tileable_vertical = getboolfield_default(
 351                         L, index, "tileable_vertical", default_tiling);
 352                 // color = ...
 353                 lua_getfield(L, index, "color");
 354                 tiledef.has_color = read_color(L, -1, &tiledef.color);
 355                 lua_pop(L, 1);
 356                 // animation = {}
 357                 lua_getfield(L, index, "animation");
 358                 tiledef.animation = read_animation_definition(L, -1);
 359                 lua_pop(L, 1);
 360         }
 361
 362         return tiledef;
 363 }
 364
 365 /******************************************************************************/
 366 ContentFeatures read_content_features(lua_State *L, int index)
 367 {
 368         if(index < 0)
 369                 index = lua_gettop(L) + 1 + index;
 370
 371         ContentFeatures f;
 372
 373         /* Cache existence of some callbacks */
 374         lua_getfield(L, index, "on_construct");
 375         if(!lua_isnil(L, -1)) f.has_on_construct = true;
 376         lua_pop(L, 1);
 377         lua_getfield(L, index, "on_destruct");
 378         if(!lua_isnil(L, -1)) f.has_on_destruct = true;
 379         lua_pop(L, 1);
 380         lua_getfield(L, index, "after_destruct");
 381         if(!lua_isnil(L, -1)) f.has_after_destruct = true;
 382         lua_pop(L, 1);
 383
 384         lua_getfield(L, index, "on_rightclick");
 385         f.rightclickable = lua_isfunction(L, -1);
 386         lua_pop(L, 1);
 387
 388         /* Name */
 389         getstringfield(L, index, "name", f.name);
 390
 391         /* Groups */
 392         lua_getfield(L, index, "groups");
 393         read_groups(L, -1, f.groups);
 394         lua_pop(L, 1);
 395
 396         /* Visual definition */
 397
 398         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype",
 399                         ScriptApiNode::es_DrawType,NDT_NORMAL);
 400         getfloatfield(L, index, "visual_scale", f.visual_scale);
 401
 402         /* Meshnode model filename */
 403         getstringfield(L, index, "mesh", f.mesh);
 404
 405         // tiles = {}
 406         lua_getfield(L, index, "tiles");
 407         // If nil, try the deprecated name "tile_images" instead
 408         if(lua_isnil(L, -1)){
 409                 lua_pop(L, 1);
 410                 warn_if_field_exists(L, index, "tile_images",
 411                                 "Deprecated; new name is \"tiles\".");
 412                 lua_getfield(L, index, "tile_images");
 413         }
 414         if(lua_istable(L, -1)){
 415                 int table = lua_gettop(L);
 416                 lua_pushnil(L);
 417                 int i = 0;
 418                 while(lua_next(L, table) != 0){
 419                         // Read tiledef from value
 420                         f.tiledef[i] = read_tiledef(L, -1, f.drawtype);
 421                         // removes value, keeps key for next iteration
 422                         lua_pop(L, 1);
 423                         i++;
 424                         if(i==6){
 425                                 lua_pop(L, 1);
 426                                 break;
 427                         }
 428                 }
 429                 // Copy last value to all remaining textures
 430                 if(i >= 1){
 431                         TileDef lasttile = f.tiledef[i-1];
 432                         while(i < 6){
 433                                 f.tiledef[i] = lasttile;
 434                                 i++;
 435                         }
 436                 }
 437         }
 438         lua_pop(L, 1);
 439
 440         // overlay_tiles = {}
 441         lua_getfield(L, index, "overlay_tiles");
 442         if (lua_istable(L, -1)) {
 443                 int table = lua_gettop(L);
 444                 lua_pushnil(L);
 445                 int i = 0;
 446                 while (lua_next(L, table) != 0) {
 447                         // Read tiledef from value
 448                         f.tiledef_overlay[i] = read_tiledef(L, -1, f.drawtype);
 449                         // removes value, keeps key for next iteration
 450                         lua_pop(L, 1);
 451                         i++;
 452                         if (i == 6) {
 453                                 lua_pop(L, 1);
 454                                 break;
 455                         }
 456                 }
 457                 // Copy last value to all remaining textures
 458                 if (i >= 1) {
 459                         TileDef lasttile = f.tiledef_overlay[i - 1];
 460                         while (i < 6) {
 461                                 f.tiledef_overlay[i] = lasttile;
 462                                 i++;
 463                         }
 464                 }
 465         }
 466         lua_pop(L, 1);
 467
 468         // special_tiles = {}
 469         lua_getfield(L, index, "special_tiles");
 470         // If nil, try the deprecated name "special_materials" instead
 471         if(lua_isnil(L, -1)){
 472                 lua_pop(L, 1);
 473                 warn_if_field_exists(L, index, "special_materials",
 474                                 "Deprecated; new name is \"special_tiles\".");
 475                 lua_getfield(L, index, "special_materials");
 476         }
 477         if(lua_istable(L, -1)){
 478                 int table = lua_gettop(L);
 479                 lua_pushnil(L);
 480                 int i = 0;
 481                 while(lua_next(L, table) != 0){
 482                         // Read tiledef from value
 483                         f.tiledef_special[i] = read_tiledef(L, -1, f.drawtype);
 484                         // removes value, keeps key for next iteration
 485                         lua_pop(L, 1);
 486                         i++;
 487                         if(i==CF_SPECIAL_COUNT){
 488                                 lua_pop(L, 1);
 489                                 break;
 490                         }
 491                 }
 492         }
 493         lua_pop(L, 1);
 494
 495         f.alpha = getintfield_default(L, index, "alpha", 255);
 496
 497         bool usealpha = getboolfield_default(L, index,
 498                         "use_texture_alpha", false);
 499         if (usealpha)
 500                 f.alpha = 0;
 501
 502         // Read node color.
 503         lua_getfield(L, index, "color");
 504         read_color(L, -1, &f.color);
 505         lua_pop(L, 1);
 506
 507         getstringfield(L, index, "palette", f.palette_name);
 508
 509         /* Other stuff */
 510
 511         lua_getfield(L, index, "post_effect_color");
 512         read_color(L, -1, &f.post_effect_color);
 513         lua_pop(L, 1);
 514
 515         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
 516                         ScriptApiNode::es_ContentParamType, CPT_NONE);
 517         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
 518                         ScriptApiNode::es_ContentParamType2, CPT2_NONE);
 519
 520         if (f.palette_name != "" &&
 521                         !(f.param_type_2 == CPT2_COLOR ||
 522                         f.param_type_2 == CPT2_COLORED_FACEDIR ||
 523                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED))
 524                 warningstream << "Node " << f.name.c_str()
 525                         << " has a palette, but not a suitable paramtype2." << std::endl;
 526
 527         // Warn about some deprecated fields
 528         warn_if_field_exists(L, index, "wall_mounted",
 529                         "Deprecated; use paramtype2 = 'wallmounted'");
 530         warn_if_field_exists(L, index, "light_propagates",
 531                         "Deprecated; determined from paramtype");
 532         warn_if_field_exists(L, index, "dug_item",
 533                         "Deprecated; use 'drop' field");
 534         warn_if_field_exists(L, index, "extra_dug_item",
 535                         "Deprecated; use 'drop' field");
 536         warn_if_field_exists(L, index, "extra_dug_item_rarity",
 537                         "Deprecated; use 'drop' field");
 538         warn_if_field_exists(L, index, "metadata_name",
 539                         "Deprecated; use on_add and metadata callbacks");
 540
 541         // True for all ground-like things like stone and mud, false for eg. trees
 542         getboolfield(L, index, "is_ground_content", f.is_ground_content);
 543         f.light_propagates = (f.param_type == CPT_LIGHT);
 544         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
 545         // This is used for collision detection.
 546         // Also for general solidness queries.
 547         getboolfield(L, index, "walkable", f.walkable);
 548         // Player can point to these
 549         getboolfield(L, index, "pointable", f.pointable);
 550         // Player can dig these
 551         getboolfield(L, index, "diggable", f.diggable);
 552         // Player can climb these
 553         getboolfield(L, index, "climbable", f.climbable);
 554         // Player can build on these
 555         getboolfield(L, index, "buildable_to", f.buildable_to);
 556         // Liquids flow into and replace node
 557         getboolfield(L, index, "floodable", f.floodable);
 558         // Whether the node is non-liquid, source liquid or flowing liquid
 559         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
 560                         ScriptApiNode::es_LiquidType, LIQUID_NONE);
 561         // If the content is liquid, this is the flowing version of the liquid.
 562         getstringfield(L, index, "liquid_alternative_flowing",
 563                         f.liquid_alternative_flowing);
 564         // If the content is liquid, this is the source version of the liquid.
 565         getstringfield(L, index, "liquid_alternative_source",
 566                         f.liquid_alternative_source);
 567         // Viscosity for fluid flow, ranging from 1 to 7, with
 568         // 1 giving almost instantaneous propagation and 7 being
 569         // the slowest possible
 570         f.liquid_viscosity = getintfield_default(L, index,
 571                         "liquid_viscosity", f.liquid_viscosity);
 572         f.liquid_range = getintfield_default(L, index,
 573                         "liquid_range", f.liquid_range);
 574         f.leveled = getintfield_default(L, index, "leveled", f.leveled);
 575
 576         getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
 577         f.drowning = getintfield_default(L, index,
 578                         "drowning", f.drowning);
 579         // Amount of light the node emits
 580         f.light_source = getintfield_default(L, index,
 581                         "light_source", f.light_source);
 582         if (f.light_source > LIGHT_MAX) {
 583                 warningstream << "Node " << f.name.c_str()
 584                         << " had greater light_source than " << LIGHT_MAX
 585                         << ", it was reduced." << std::endl;
 586                 f.light_source = LIGHT_MAX;
 587         }
 588         f.damage_per_second = getintfield_default(L, index,
 589                         "damage_per_second", f.damage_per_second);
 590
 591         lua_getfield(L, index, "node_box");
 592         if(lua_istable(L, -1))
 593                 f.node_box = read_nodebox(L, -1);
 594         lua_pop(L, 1);
 595
 596         lua_getfield(L, index, "connects_to");
 597         if (lua_istable(L, -1)) {
 598                 int table = lua_gettop(L);
 599                 lua_pushnil(L);
 600                 while (lua_next(L, table) != 0) {
 601                         // Value at -1
 602                         f.connects_to.push_back(lua_tostring(L, -1));
 603                         lua_pop(L, 1);
 604                 }
 605         }
 606         lua_pop(L, 1);
 607
 608         lua_getfield(L, index, "connect_sides");
 609         if (lua_istable(L, -1)) {
 610                 int table = lua_gettop(L);
 611                 lua_pushnil(L);
 612                 while (lua_next(L, table) != 0) {
 613                         // Value at -1
 614                         std::string side(lua_tostring(L, -1));
 615                         // Note faces are flipped to make checking easier
 616                         if (side == "top")
 617                                 f.connect_sides |= 2;
 618                         else if (side == "bottom")
 619                                 f.connect_sides |= 1;
 620                         else if (side == "front")
 621                                 f.connect_sides |= 16;
 622                         else if (side == "left")
 623                                 f.connect_sides |= 32;
 624                         else if (side == "back")
 625                                 f.connect_sides |= 4;
 626                         else if (side == "right")
 627                                 f.connect_sides |= 8;
 628                         else
 629                                 warningstream << "Unknown value for \"connect_sides\": "
 630                                         << side << std::endl;
 631                         lua_pop(L, 1);
 632                 }
 633         }
 634         lua_pop(L, 1);
 635
 636         lua_getfield(L, index, "selection_box");
 637         if(lua_istable(L, -1))
 638                 f.selection_box = read_nodebox(L, -1);
 639         lua_pop(L, 1);
 640
 641         lua_getfield(L, index, "collision_box");
 642         if(lua_istable(L, -1))
 643                 f.collision_box = read_nodebox(L, -1);
 644         lua_pop(L, 1);
 645
 646         f.waving = getintfield_default(L, index,
 647                         "waving", f.waving);
 648
 649         // Set to true if paramtype used to be 'facedir_simple'
 650         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
 651         // Set to true if wall_mounted used to be set to true
 652         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
 653
 654         // Sound table
 655         lua_getfield(L, index, "sounds");
 656         if(lua_istable(L, -1)){
 657                 lua_getfield(L, -1, "footstep");
 658                 read_soundspec(L, -1, f.sound_footstep);
 659                 lua_pop(L, 1);
 660                 lua_getfield(L, -1, "dig");
 661                 read_soundspec(L, -1, f.sound_dig);
 662                 lua_pop(L, 1);
 663                 lua_getfield(L, -1, "dug");
 664                 read_soundspec(L, -1, f.sound_dug);
 665                 lua_pop(L, 1);
 666         }
 667         lua_pop(L, 1);
 668
 669         return f;
 670 }
 671
 672 /******************************************************************************/
 673 void read_server_sound_params(lua_State *L, int index,
 674                 ServerSoundParams &params)
 675 {
 676         if(index < 0)
 677                 index = lua_gettop(L) + 1 + index;
 678         // Clear
 679         params = ServerSoundParams();
 680         if(lua_istable(L, index)){
 681                 getfloatfield(L, index, "gain", params.gain);
 682                 getstringfield(L, index, "to_player", params.to_player);
 683                 lua_getfield(L, index, "pos");
 684                 if(!lua_isnil(L, -1)){
 685                         v3f p = read_v3f(L, -1)*BS;
 686                         params.pos = p;
 687                         params.type = ServerSoundParams::SSP_POSITIONAL;
 688                 }
 689                 lua_pop(L, 1);
 690                 lua_getfield(L, index, "object");
 691                 if(!lua_isnil(L, -1)){
 692                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
 693                         ServerActiveObject *sao = ObjectRef::getobject(ref);
 694                         if(sao){
 695                                 params.object = sao->getId();
 696                                 params.type = ServerSoundParams::SSP_OBJECT;
 697                         }
 698                 }
 699                 lua_pop(L, 1);
 700                 params.max_hear_distance = BS*getfloatfield_default(L, index,
 701                                 "max_hear_distance", params.max_hear_distance/BS);
 702                 getboolfield(L, index, "loop", params.loop);
 703         }
 704 }
 705
 706 /******************************************************************************/
 707 void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
 708 {
 709         if(index < 0)
 710                 index = lua_gettop(L) + 1 + index;
 711         if(lua_isnil(L, index)){
 712         } else if(lua_istable(L, index)){
 713                 getstringfield(L, index, "name", spec.name);
 714                 getfloatfield(L, index, "gain", spec.gain);
 715         } else if(lua_isstring(L, index)){
 716                 spec.name = lua_tostring(L, index);
 717         }
 718 }
 719
 720 /******************************************************************************/
 721 NodeBox read_nodebox(lua_State *L, int index)
 722 {
 723         NodeBox nodebox;
 724         if(lua_istable(L, -1)){
 725                 nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
 726                                 ScriptApiNode::es_NodeBoxType, NODEBOX_REGULAR);
 727
 728 #define NODEBOXREAD(n, s) \
 729         do { \
 730                 lua_getfield(L, index, (s)); \
 731                 if (lua_istable(L, -1)) \
 732                         (n) = read_aabb3f(L, -1, BS); \
 733                 lua_pop(L, 1); \
 734         } while (0)
 735
 736 #define NODEBOXREADVEC(n, s) \
 737         do { \
 738                 lua_getfield(L, index, (s)); \
 739                 if (lua_istable(L, -1)) \
 740                         (n) = read_aabb3f_vector(L, -1, BS); \
 741                 lua_pop(L, 1); \
 742         } while (0)
 743                 NODEBOXREADVEC(nodebox.fixed, "fixed");
 744                 NODEBOXREAD(nodebox.wall_top, "wall_top");
 745                 NODEBOXREAD(nodebox.wall_bottom, "wall_bottom");
 746                 NODEBOXREAD(nodebox.wall_side, "wall_side");
 747                 NODEBOXREADVEC(nodebox.connect_top, "connect_top");
 748                 NODEBOXREADVEC(nodebox.connect_bottom, "connect_bottom");
 749                 NODEBOXREADVEC(nodebox.connect_front, "connect_front");
 750                 NODEBOXREADVEC(nodebox.connect_left, "connect_left");
 751                 NODEBOXREADVEC(nodebox.connect_back, "connect_back");
 752                 NODEBOXREADVEC(nodebox.connect_right, "connect_right");
 753         }
 754         return nodebox;
 755 }
 756
 757 /******************************************************************************/
 758 MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
 759 {
 760         lua_getfield(L, index, "name");
 761         if (!lua_isstring(L, -1))
 762                 throw LuaError("Node name is not set or is not a string!");
 763         const char *name = lua_tostring(L, -1);
 764         lua_pop(L, 1);
 765
 766         u8 param1 = 0;
 767         lua_getfield(L, index, "param1");
 768         if (!lua_isnil(L, -1))
 769                 param1 = lua_tonumber(L, -1);
 770         lua_pop(L, 1);
 771
 772         u8 param2 = 0;
 773         lua_getfield(L, index, "param2");
 774         if (!lua_isnil(L, -1))
 775                 param2 = lua_tonumber(L, -1);
 776         lua_pop(L, 1);
 777
 778         return MapNode(ndef, name, param1, param2);
 779 }
 780
 781 /******************************************************************************/
 782 void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
 783 {
 784         lua_newtable(L);
 785         lua_pushstring(L, ndef->get(n).name.c_str());
 786         lua_setfield(L, -2, "name");
 787         lua_pushnumber(L, n.getParam1());
 788         lua_setfield(L, -2, "param1");
 789         lua_pushnumber(L, n.getParam2());
 790         lua_setfield(L, -2, "param2");
 791 }
 792
 793 /******************************************************************************/
 794 void warn_if_field_exists(lua_State *L, int table,
 795                 const char *name, const std::string &message)
 796 {
 797         lua_getfield(L, table, name);
 798         if (!lua_isnil(L, -1)) {
 799                 warningstream << "Field \"" << name << "\": "
 800                                 << message << std::endl;
 801                 infostream << script_get_backtrace(L) << std::endl;
 802         }
 803         lua_pop(L, 1);
 804 }
 805
 806 /******************************************************************************/
 807 int getenumfield(lua_State *L, int table,
 808                 const char *fieldname, const EnumString *spec, int default_)
 809 {
 810         int result = default_;
 811         string_to_enum(spec, result,
 812                         getstringfield_default(L, table, fieldname, ""));
 813         return result;
 814 }
 815
 816 /******************************************************************************/
 817 bool string_to_enum(const EnumString *spec, int &result,
 818                 const std::string &str)
 819 {
 820         const EnumString *esp = spec;
 821         while(esp->str){
 822                 if(str == std::string(esp->str)){
 823                         result = esp->num;
 824                         return true;
 825                 }
 826                 esp++;
 827         }
 828         return false;
 829 }
 830
 831 /******************************************************************************/
 832 ItemStack read_item(lua_State* L, int index, IItemDefManager *idef)
 833 {
 834         if(index < 0)
 835                 index = lua_gettop(L) + 1 + index;
 836
 837         if(lua_isnil(L, index))
 838         {
 839                 return ItemStack();
 840         }
 841         else if(lua_isuserdata(L, index))
 842         {
 843                 // Convert from LuaItemStack
 844                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
 845                 return o->getItem();
 846         }
 847         else if(lua_isstring(L, index))
 848         {
 849                 // Convert from itemstring
 850                 std::string itemstring = lua_tostring(L, index);
 851                 try
 852                 {
 853                         ItemStack item;
 854                         item.deSerialize(itemstring, idef);
 855                         return item;
 856                 }
 857                 catch(SerializationError &e)
 858                 {
 859                         warningstream<<"unable to create item from itemstring"
 860                                         <<": "<<itemstring<<std::endl;
 861                         return ItemStack();
 862                 }
 863         }
 864         else if(lua_istable(L, index))
 865         {
 866                 // Convert from table
 867                 std::string name = getstringfield_default(L, index, "name", "");
 868                 int count = getintfield_default(L, index, "count", 1);
 869                 int wear = getintfield_default(L, index, "wear", 0);
 870
 871                 ItemStack istack(name, count, wear, idef);
 872
 873                 // BACKWARDS COMPATIBLITY
 874                 std::string value = getstringfield_default(L, index, "metadata", "");
 875                 istack.metadata.setString("", value);
 876
 877                 // Get meta
 878                 lua_getfield(L, index, "meta");
 879                 int fieldstable = lua_gettop(L);
 880                 if (lua_istable(L, fieldstable)) {
 881                         lua_pushnil(L);
 882                         while (lua_next(L, fieldstable) != 0) {
 883                                 // key at index -2 and value at index -1
 884                                 std::string key = lua_tostring(L, -2);
 885                                 size_t value_len;
 886                                 const char *value_cs = lua_tolstring(L, -1, &value_len);
 887                                 std::string value(value_cs, value_len);
 888                                 istack.metadata.setString(key, value);
 889                                 lua_pop(L, 1); // removes value, keeps key for next iteration
 890                         }
 891                 }
 892
 893                 return istack;
 894         } else {
 895                 throw LuaError("Expecting itemstack, itemstring, table or nil");
 896         }
 897 }
 898
 899 /******************************************************************************/
 900 void push_tool_capabilities(lua_State *L,
 901                 const ToolCapabilities &toolcap)
 902 {
 903         lua_newtable(L);
 904         setfloatfield(L, -1, "full_punch_interval", toolcap.full_punch_interval);
 905                 setintfield(L, -1, "max_drop_level", toolcap.max_drop_level);
 906                 // Create groupcaps table
 907                 lua_newtable(L);
 908                 // For each groupcap
 909                 for (ToolGCMap::const_iterator i = toolcap.groupcaps.begin();
 910                         i != toolcap.groupcaps.end(); ++i) {
 911                         // Create groupcap table
 912                         lua_newtable(L);
 913                         const std::string &name = i->first;
 914                         const ToolGroupCap &groupcap = i->second;
 915                         // Create subtable "times"
 916                         lua_newtable(L);
 917                         for (UNORDERED_MAP<int, float>::const_iterator
 918                                         i = groupcap.times.begin(); i != groupcap.times.end(); ++i) {
 919                                 lua_pushinteger(L, i->first);
 920                                 lua_pushnumber(L, i->second);
 921                                 lua_settable(L, -3);
 922                         }
 923                         // Set subtable "times"
 924                         lua_setfield(L, -2, "times");
 925                         // Set simple parameters
 926                         setintfield(L, -1, "maxlevel", groupcap.maxlevel);
 927                         setintfield(L, -1, "uses", groupcap.uses);
 928                         // Insert groupcap table into groupcaps table
 929                         lua_setfield(L, -2, name.c_str());
 930                 }
 931                 // Set groupcaps table
 932                 lua_setfield(L, -2, "groupcaps");
 933                 //Create damage_groups table
 934                 lua_newtable(L);
 935                 // For each damage group
 936                 for (DamageGroup::const_iterator i = toolcap.damageGroups.begin();
 937                         i != toolcap.damageGroups.end(); ++i) {
 938                         // Create damage group table
 939                         lua_pushinteger(L, i->second);
 940                         lua_setfield(L, -2, i->first.c_str());
 941                 }
 942                 lua_setfield(L, -2, "damage_groups");
 943 }
 944
 945 /******************************************************************************/
 946 void push_inventory_list(lua_State *L, Inventory *inv, const char *name)
 947 {
 948         InventoryList *invlist = inv->getList(name);
 949         if(invlist == NULL){
 950                 lua_pushnil(L);
 951                 return;
 952         }
 953         std::vector<ItemStack> items;
 954         for(u32 i=0; i<invlist->getSize(); i++)
 955                 items.push_back(invlist->getItem(i));
 956         push_items(L, items);
 957 }
 958
 959 /******************************************************************************/
 960 void read_inventory_list(lua_State *L, int tableindex,
 961                 Inventory *inv, const char *name, Server* srv, int forcesize)
 962 {
 963         if(tableindex < 0)
 964                 tableindex = lua_gettop(L) + 1 + tableindex;
 965         // If nil, delete list
 966         if(lua_isnil(L, tableindex)){
 967                 inv->deleteList(name);
 968                 return;
 969         }
 970         // Otherwise set list
 971         std::vector<ItemStack> items = read_items(L, tableindex,srv);
 972         int listsize = (forcesize != -1) ? forcesize : items.size();
 973         InventoryList *invlist = inv->addList(name, listsize);
 974         int index = 0;
 975         for(std::vector<ItemStack>::const_iterator
 976                         i = items.begin(); i != items.end(); ++i){
 977                 if(forcesize != -1 && index == forcesize)
 978                         break;
 979                 invlist->changeItem(index, *i);
 980                 index++;
 981         }
 982         while(forcesize != -1 && index < forcesize){
 983                 invlist->deleteItem(index);
 984                 index++;
 985         }
 986 }
 987
 988 /******************************************************************************/
 989 struct TileAnimationParams read_animation_definition(lua_State *L, int index)
 990 {
 991         if(index < 0)
 992                 index = lua_gettop(L) + 1 + index;
 993
 994         struct TileAnimationParams anim;
 995         anim.type = TAT_NONE;
 996         if (!lua_istable(L, index))
 997                 return anim;
 998
 999         anim.type = (TileAnimationType)
1000                 getenumfield(L, index, "type", es_TileAnimationType,
1001                 TAT_NONE);
1002         if (anim.type == TAT_VERTICAL_FRAMES) {
1003                 // {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
1004                 anim.vertical_frames.aspect_w =
1005                         getintfield_default(L, index, "aspect_w", 16);
1006                 anim.vertical_frames.aspect_h =
1007                         getintfield_default(L, index, "aspect_h", 16);
1008                 anim.vertical_frames.length =
1009                         getfloatfield_default(L, index, "length", 1.0);
1010         } else if (anim.type == TAT_SHEET_2D) {
1011                 // {type="sheet_2d", frames_w=5, frames_h=3, frame_length=0.5}
1012                 getintfield(L, index, "frames_w",
1013                         anim.sheet_2d.frames_w);
1014                 getintfield(L, index, "frames_h",
1015                         anim.sheet_2d.frames_h);
1016                 getfloatfield(L, index, "frame_length",
1017                         anim.sheet_2d.frame_length);
1018         }
1019
1020         return anim;
1021 }
1022
1023 /******************************************************************************/
1024 ToolCapabilities read_tool_capabilities(
1025                 lua_State *L, int table)
1026 {
1027         ToolCapabilities toolcap;
1028         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
1029         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
1030         lua_getfield(L, table, "groupcaps");
1031         if(lua_istable(L, -1)){
1032                 int table_groupcaps = lua_gettop(L);
1033                 lua_pushnil(L);
1034                 while(lua_next(L, table_groupcaps) != 0){
1035                         // key at index -2 and value at index -1
1036                         std::string groupname = luaL_checkstring(L, -2);
1037                         if(lua_istable(L, -1)){
1038                                 int table_groupcap = lua_gettop(L);
1039                                 // This will be created
1040                                 ToolGroupCap groupcap;
1041                                 // Read simple parameters
1042                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
1043                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
1044                                 // DEPRECATED: maxwear
1045                                 float maxwear = 0;
1046                                 if (getfloatfield(L, table_groupcap, "maxwear", maxwear)){
1047                                         if (maxwear != 0)
1048                                                 groupcap.uses = 1.0/maxwear;
1049                                         else
1050                                                 groupcap.uses = 0;
1051                                         warningstream << "Field \"maxwear\" is deprecated; "
1052                                                         << "replace with uses=1/maxwear" << std::endl;
1053                                         infostream << script_get_backtrace(L) << std::endl;
1054                                 }
1055                                 // Read "times" table
1056                                 lua_getfield(L, table_groupcap, "times");
1057                                 if(lua_istable(L, -1)){
1058                                         int table_times = lua_gettop(L);
1059                                         lua_pushnil(L);
1060                                         while(lua_next(L, table_times) != 0){
1061                                                 // key at index -2 and value at index -1
1062                                                 int rating = luaL_checkinteger(L, -2);
1063                                                 float time = luaL_checknumber(L, -1);
1064                                                 groupcap.times[rating] = time;
1065                                                 // removes value, keeps key for next iteration
1066                                                 lua_pop(L, 1);
1067                                         }
1068                                 }
1069                                 lua_pop(L, 1);
1070                                 // Insert groupcap into toolcap
1071                                 toolcap.groupcaps[groupname] = groupcap;
1072                         }
1073                         // removes value, keeps key for next iteration
1074                         lua_pop(L, 1);
1075                 }
1076         }
1077         lua_pop(L, 1);
1078
1079         lua_getfield(L, table, "damage_groups");
1080         if(lua_istable(L, -1)){
1081                 int table_damage_groups = lua_gettop(L);
1082                 lua_pushnil(L);
1083                 while(lua_next(L, table_damage_groups) != 0){
1084                         // key at index -2 and value at index -1
1085                         std::string groupname = luaL_checkstring(L, -2);
1086                         u16 value = luaL_checkinteger(L, -1);
1087                         toolcap.damageGroups[groupname] = value;
1088                         // removes value, keeps key for next iteration
1089                         lua_pop(L, 1);
1090                 }
1091         }
1092         lua_pop(L, 1);
1093         return toolcap;
1094 }
1095
1096 /******************************************************************************/
1097 void push_dig_params(lua_State *L,const DigParams &params)
1098 {
1099         lua_newtable(L);
1100         setboolfield(L, -1, "diggable", params.diggable);
1101         setfloatfield(L, -1, "time", params.time);
1102         setintfield(L, -1, "wear", params.wear);
1103 }
1104
1105 /******************************************************************************/
1106 void push_hit_params(lua_State *L,const HitParams &params)
1107 {
1108         lua_newtable(L);
1109         setintfield(L, -1, "hp", params.hp);
1110         setintfield(L, -1, "wear", params.wear);
1111 }
1112
1113 /******************************************************************************/
1114
1115 bool getflagsfield(lua_State *L, int table, const char *fieldname,
1116         FlagDesc *flagdesc, u32 *flags, u32 *flagmask)
1117 {
1118         lua_getfield(L, table, fieldname);
1119
1120         bool success = read_flags(L, -1, flagdesc, flags, flagmask);
1121
1122         lua_pop(L, 1);
1123
1124         return success;
1125 }
1126
1127 bool read_flags(lua_State *L, int index, FlagDesc *flagdesc,
1128         u32 *flags, u32 *flagmask)
1129 {
1130         if (lua_isstring(L, index)) {
1131                 std::string flagstr = lua_tostring(L, index);
1132                 *flags = readFlagString(flagstr, flagdesc, flagmask);
1133         } else if (lua_istable(L, index)) {
1134                 *flags = read_flags_table(L, index, flagdesc, flagmask);
1135         } else {
1136                 return false;
1137         }
1138
1139         return true;
1140 }
1141
1142 u32 read_flags_table(lua_State *L, int table, FlagDesc *flagdesc, u32 *flagmask)
1143 {
1144         u32 flags = 0, mask = 0;
1145         char fnamebuf[64] = "no";
1146
1147         for (int i = 0; flagdesc[i].name; i++) {
1148                 bool result;
1149
1150                 if (getboolfield(L, table, flagdesc[i].name, result)) {
1151                         mask |= flagdesc[i].flag;
1152                         if (result)
1153                                 flags |= flagdesc[i].flag;
1154                 }
1155
1156                 strlcpy(fnamebuf + 2, flagdesc[i].name, sizeof(fnamebuf) - 2);
1157                 if (getboolfield(L, table, fnamebuf, result))
1158                         mask |= flagdesc[i].flag;
1159         }
1160
1161         if (flagmask)
1162                 *flagmask = mask;
1163
1164         return flags;
1165 }
1166
1167 void push_flags_string(lua_State *L, FlagDesc *flagdesc, u32 flags, u32 flagmask)
1168 {
1169         std::string flagstring = writeFlagString(flags, flagdesc, flagmask);
1170         lua_pushlstring(L, flagstring.c_str(), flagstring.size());
1171 }
1172
1173 /******************************************************************************/
1174 /* Lua Stored data!                                                           */
1175 /******************************************************************************/
1176
1177 /******************************************************************************/
1178 void read_groups(lua_State *L, int index, ItemGroupList &result)
1179 {
1180         if (!lua_istable(L,index))
1181                 return;
1182         result.clear();
1183         lua_pushnil(L);
1184         if(index < 0)
1185                 index -= 1;
1186         while(lua_next(L, index) != 0){
1187                 // key at index -2 and value at index -1
1188                 std::string name = luaL_checkstring(L, -2);
1189                 int rating = luaL_checkinteger(L, -1);
1190                 result[name] = rating;
1191                 // removes value, keeps key for next iteration
1192                 lua_pop(L, 1);
1193         }
1194 }
1195
1196 /******************************************************************************/
1197 void push_groups(lua_State *L, const ItemGroupList &groups)
1198 {
1199         lua_newtable(L);
1200         for (ItemGroupList::const_iterator it = groups.begin(); it != groups.end(); ++it) {
1201                 lua_pushnumber(L, it->second);
1202                 lua_setfield(L, -2, it->first.c_str());
1203         }
1204 }
1205
1206 /******************************************************************************/
1207 void push_items(lua_State *L, const std::vector<ItemStack> &items)
1208 {
1209         lua_createtable(L, items.size(), 0);
1210         for (u32 i = 0; i != items.size(); i++) {
1211                 LuaItemStack::create(L, items[i]);
1212                 lua_rawseti(L, -2, i + 1);
1213         }
1214 }
1215
1216 /******************************************************************************/
1217 std::vector<ItemStack> read_items(lua_State *L, int index, Server *srv)
1218 {
1219         if(index < 0)
1220                 index = lua_gettop(L) + 1 + index;
1221
1222         std::vector<ItemStack> items;
1223         luaL_checktype(L, index, LUA_TTABLE);
1224         lua_pushnil(L);
1225         while (lua_next(L, index)) {
1226                 s32 key = luaL_checkinteger(L, -2);
1227                 if (key < 1) {
1228                         throw LuaError("Invalid inventory list index");
1229                 }
1230                 if (items.size() < (u32) key) {
1231                         items.resize(key);
1232                 }
1233                 items[key - 1] = read_item(L, -1, srv->idef());
1234                 lua_pop(L, 1);
1235         }
1236         return items;
1237 }
1238
1239 /******************************************************************************/
1240 void luaentity_get(lua_State *L, u16 id)
1241 {
1242         // Get luaentities[i]
1243         lua_getglobal(L, "core");
1244         lua_getfield(L, -1, "luaentities");
1245         luaL_checktype(L, -1, LUA_TTABLE);
1246         lua_pushnumber(L, id);
1247         lua_gettable(L, -2);
1248         lua_remove(L, -2); // Remove luaentities
1249         lua_remove(L, -2); // Remove core
1250 }
1251
1252 /******************************************************************************/
1253 bool read_noiseparams(lua_State *L, int index, NoiseParams *np)
1254 {
1255         if (index < 0)
1256                 index = lua_gettop(L) + 1 + index;
1257
1258         if (!lua_istable(L, index))
1259                 return false;
1260
1261         getfloatfield(L, index, "offset",      np->offset);
1262         getfloatfield(L, index, "scale",       np->scale);
1263         getfloatfield(L, index, "persist",     np->persist);
1264         getfloatfield(L, index, "persistence", np->persist);
1265         getfloatfield(L, index, "lacunarity",  np->lacunarity);
1266         getintfield(L,   index, "seed",        np->seed);
1267         getintfield(L,   index, "octaves",     np->octaves);
1268
1269         u32 flags    = 0;
1270         u32 flagmask = 0;
1271         np->flags = getflagsfield(L, index, "flags", flagdesc_noiseparams,
1272                 &flags, &flagmask) ? flags : NOISE_FLAG_DEFAULTS;
1273
1274         lua_getfield(L, index, "spread");
1275         np->spread  = read_v3f(L, -1);
1276         lua_pop(L, 1);
1277
1278         return true;
1279 }
1280
1281 void push_noiseparams(lua_State *L, NoiseParams *np)
1282 {
1283         lua_newtable(L);
1284         lua_pushnumber(L, np->offset);
1285         lua_setfield(L, -2, "offset");
1286         lua_pushnumber(L, np->scale);
1287         lua_setfield(L, -2, "scale");
1288         lua_pushnumber(L, np->persist);
1289         lua_setfield(L, -2, "persistence");
1290         lua_pushnumber(L, np->lacunarity);
1291         lua_setfield(L, -2, "lacunarity");
1292         lua_pushnumber(L, np->seed);
1293         lua_setfield(L, -2, "seed");
1294         lua_pushnumber(L, np->octaves);
1295         lua_setfield(L, -2, "octaves");
1296
1297         push_flags_string(L, flagdesc_noiseparams, np->flags,
1298                 np->flags);
1299         lua_setfield(L, -2, "flags");
1300
1301         push_v3f(L, np->spread);
1302         lua_setfield(L, -2, "spread");
1303 }
1304
1305 /******************************************************************************/
1306 // Returns depth of json value tree
1307 static int push_json_value_getdepth(const Json::Value &value)
1308 {
1309         if (!value.isArray() && !value.isObject())
1310                 return 1;
1311
1312         int maxdepth = 0;
1313         for (Json::Value::const_iterator it = value.begin();
1314                         it != value.end(); ++it) {
1315                 int elemdepth = push_json_value_getdepth(*it);
1316                 if (elemdepth > maxdepth)
1317                         maxdepth = elemdepth;
1318         }
1319         return maxdepth + 1;
1320 }
1321 // Recursive function to convert JSON --> Lua table
1322 static bool push_json_value_helper(lua_State *L, const Json::Value &value,
1323                 int nullindex)
1324 {
1325         switch(value.type()) {
1326                 case Json::nullValue:
1327                 default:
1328                         lua_pushvalue(L, nullindex);
1329                         break;
1330                 case Json::intValue:
1331                         lua_pushinteger(L, value.asInt());
1332                         break;
1333                 case Json::uintValue:
1334                         lua_pushinteger(L, value.asUInt());
1335                         break;
1336                 case Json::realValue:
1337                         lua_pushnumber(L, value.asDouble());
1338                         break;
1339                 case Json::stringValue:
1340                         {
1341                                 const char *str = value.asCString();
1342                                 lua_pushstring(L, str ? str : "");
1343                         }
1344                         break;
1345                 case Json::booleanValue:
1346                         lua_pushboolean(L, value.asInt());
1347                         break;
1348                 case Json::arrayValue:
1349                         lua_newtable(L);
1350                         for (Json::Value::const_iterator it = value.begin();
1351                                         it != value.end(); ++it) {
1352                                 push_json_value_helper(L, *it, nullindex);
1353                                 lua_rawseti(L, -2, it.index() + 1);
1354                         }
1355                         break;
1356                 case Json::objectValue:
1357                         lua_newtable(L);
1358                         for (Json::Value::const_iterator it = value.begin();
1359                                         it != value.end(); ++it) {
1360 #ifndef JSONCPP_STRING
1361                                 const char *str = it.memberName();
1362                                 lua_pushstring(L, str ? str : "");
1363 #else
1364                                 std::string str = it.name();
1365                                 lua_pushstring(L, str.c_str());
1366 #endif
1367                                 push_json_value_helper(L, *it, nullindex);
1368                                 lua_rawset(L, -3);
1369                         }
1370                         break;
1371         }
1372         return true;
1373 }
1374 // converts JSON --> Lua table; returns false if lua stack limit exceeded
1375 // nullindex: Lua stack index of value to use in place of JSON null
1376 bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
1377 {
1378         if(nullindex < 0)
1379                 nullindex = lua_gettop(L) + 1 + nullindex;
1380
1381         int depth = push_json_value_getdepth(value);
1382
1383         // The maximum number of Lua stack slots used at each recursion level
1384         // of push_json_value_helper is 2, so make sure there a depth * 2 slots
1385         if (lua_checkstack(L, depth * 2))
1386                 return push_json_value_helper(L, value, nullindex);
1387         else
1388                 return false;
1389 }
1390
1391 // Converts Lua table --> JSON
1392 void read_json_value(lua_State *L, Json::Value &root, int index, u8 recursion)
1393 {
1394         if (recursion > 16) {
1395                 throw SerializationError("Maximum recursion depth exceeded");
1396         }
1397         int type = lua_type(L, index);
1398         if (type == LUA_TBOOLEAN) {
1399                 root = (bool) lua_toboolean(L, index);
1400         } else if (type == LUA_TNUMBER) {
1401                 root = lua_tonumber(L, index);
1402         } else if (type == LUA_TSTRING) {
1403                 size_t len;
1404                 const char *str = lua_tolstring(L, index, &len);
1405                 root = std::string(str, len);
1406         } else if (type == LUA_TTABLE) {
1407                 lua_pushnil(L);
1408                 while (lua_next(L, index)) {
1409                         // Key is at -2 and value is at -1
1410                         Json::Value value;
1411                         read_json_value(L, value, lua_gettop(L), recursion + 1);
1412
1413                         Json::ValueType roottype = root.type();
1414                         int keytype = lua_type(L, -1);
1415                         if (keytype == LUA_TNUMBER) {
1416                                 lua_Number key = lua_tonumber(L, -1);
1417                                 if (roottype != Json::nullValue && roottype != Json::arrayValue) {
1418                                         throw SerializationError("Can't mix array and object values in JSON");
1419                                 } else if (key < 1) {
1420                                         throw SerializationError("Can't use zero-based or negative indexes in JSON");
1421                                 } else if (floor(key) != key) {
1422                                         throw SerializationError("Can't use indexes with a fractional part in JSON");
1423                                 }
1424                                 root[(Json::ArrayIndex) key - 1] = value;
1425                         } else if (keytype == LUA_TSTRING) {
1426                                 if (roottype != Json::nullValue && roottype != Json::objectValue) {
1427                                         throw SerializationError("Can't mix array and object values in JSON");
1428                                 }
1429                                 root[lua_tostring(L, -1)] = value;
1430                         } else {
1431                                 throw SerializationError("Lua key to convert to JSON is not a string or number");
1432                         }
1433                 }
1434         } else if (type == LUA_TNIL) {
1435                 root = Json::nullValue;
1436         } else {
1437                 throw SerializationError("Can only store booleans, numbers, strings, objects, arrays, and null in JSON");
1438         }
1439         lua_pop(L, 1); // Pop value
1440 }
1441
1442 void push_pointed_thing(lua_State *L, const PointedThing &pointed)
1443 {
1444         lua_newtable(L);
1445         if (pointed.type == POINTEDTHING_NODE) {
1446                 lua_pushstring(L, "node");
1447                 lua_setfield(L, -2, "type");
1448                 push_v3s16(L, pointed.node_undersurface);
1449                 lua_setfield(L, -2, "under");
1450                 push_v3s16(L, pointed.node_abovesurface);
1451                 lua_setfield(L, -2, "above");
1452         } else if (pointed.type == POINTEDTHING_OBJECT) {
1453                 lua_pushstring(L, "object");
1454                 lua_setfield(L, -2, "type");
1455                 push_objectRef(L, pointed.object_id);
1456                 lua_setfield(L, -2, "ref");
1457         } else {
1458                 lua_pushstring(L, "nothing");
1459                 lua_setfield(L, -2, "type");
1460         }
1461 }
1462
1463 void push_objectRef(lua_State *L, const u16 id)
1464 {
1465         // Get core.object_refs[i]
1466         lua_getglobal(L, "core");
1467         lua_getfield(L, -1, "object_refs");
1468         luaL_checktype(L, -1, LUA_TTABLE);
1469         lua_pushnumber(L, id);
1470         lua_gettable(L, -2);
1471         lua_remove(L, -2); // object_refs
1472         lua_remove(L, -2); // core
1473 }