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 "collision.h"
  25 #include "cpp_api/s_node.h"
  26 #include "lua_api/l_object.h"
  27 #include "lua_api/l_item.h"
  28 #include "common/c_internal.h"
  29 #include "server.h"
  30 #include "log.h"
  31 #include "tool.h"
  32 #include "porting.h"
  33 #include "mapgen/mg_schematic.h"
  34 #include "noise.h"
  35 #include "server/player_sao.h"
  36 #include "util/pointedthing.h"
  37 #include "debug.h" // For FATAL_ERROR
  38 #include <json/json.h>
  39
  40 struct EnumString es_TileAnimationType[] =
  41 {
  42         {TAT_NONE, "none"},
  43         {TAT_VERTICAL_FRAMES, "vertical_frames"},
  44         {TAT_SHEET_2D, "sheet_2d"},
  45         {0, NULL},
  46 };
  47
  48 /******************************************************************************/
  49 void read_item_definition(lua_State* L, int index,
  50                 const ItemDefinition &default_def, ItemDefinition &def)
  51 {
  52         if (index < 0)
  53                 index = lua_gettop(L) + 1 + index;
  54
  55         def.type = (ItemType)getenumfield(L, index, "type",
  56                         es_ItemType, ITEM_NONE);
  57         getstringfield(L, index, "name", def.name);
  58         getstringfield(L, index, "description", def.description);
  59         getstringfield(L, index, "short_description", def.short_description);
  60         getstringfield(L, index, "inventory_image", def.inventory_image);
  61         getstringfield(L, index, "inventory_overlay", def.inventory_overlay);
  62         getstringfield(L, index, "wield_image", def.wield_image);
  63         getstringfield(L, index, "wield_overlay", def.wield_overlay);
  64         getstringfield(L, index, "palette", def.palette_image);
  65
  66         // Read item color.
  67         lua_getfield(L, index, "color");
  68         read_color(L, -1, &def.color);
  69         lua_pop(L, 1);
  70
  71         lua_getfield(L, index, "wield_scale");
  72         if(lua_istable(L, -1)){
  73                 def.wield_scale = check_v3f(L, -1);
  74         }
  75         lua_pop(L, 1);
  76
  77         int stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
  78         def.stack_max = rangelim(stack_max, 1, U16_MAX);
  79
  80         lua_getfield(L, index, "on_use");
  81         def.usable = lua_isfunction(L, -1);
  82         lua_pop(L, 1);
  83
  84         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
  85
  86         lua_getfield(L, index, "tool_capabilities");
  87         if(lua_istable(L, -1)){
  88                 def.tool_capabilities = new ToolCapabilities(
  89                                 read_tool_capabilities(L, -1));
  90         }
  91
  92         // If name is "" (hand), ensure there are ToolCapabilities
  93         // because it will be looked up there whenever any other item has
  94         // no ToolCapabilities
  95         if (def.name.empty() && def.tool_capabilities == NULL){
  96                 def.tool_capabilities = new ToolCapabilities();
  97         }
  98
  99         lua_getfield(L, index, "groups");
 100         read_groups(L, -1, def.groups);
 101         lua_pop(L, 1);
 102
 103         lua_getfield(L, index, "sounds");
 104         if (!lua_isnil(L, -1)) {
 105                 luaL_checktype(L, -1, LUA_TTABLE);
 106                 lua_getfield(L, -1, "place");
 107                 read_soundspec(L, -1, def.sound_place);
 108                 lua_pop(L, 1);
 109                 lua_getfield(L, -1, "place_failed");
 110                 read_soundspec(L, -1, def.sound_place_failed);
 111                 lua_pop(L, 1);
 112         }
 113         lua_pop(L, 1);
 114
 115         def.range = getfloatfield_default(L, index, "range", def.range);
 116
 117         // Client shall immediately place this node when player places the item.
 118         // Server will update the precise end result a moment later.
 119         // "" = no prediction
 120         getstringfield(L, index, "node_placement_prediction",
 121                         def.node_placement_prediction);
 122 }
 123
 124 /******************************************************************************/
 125 void push_item_definition(lua_State *L, const ItemDefinition &i)
 126 {
 127         lua_newtable(L);
 128         lua_pushstring(L, i.name.c_str());
 129         lua_setfield(L, -2, "name");
 130         lua_pushstring(L, i.description.c_str());
 131         lua_setfield(L, -2, "description");
 132 }
 133
 134 void push_item_definition_full(lua_State *L, const ItemDefinition &i)
 135 {
 136         std::string type(es_ItemType[(int)i.type].str);
 137
 138         lua_newtable(L);
 139         lua_pushstring(L, i.name.c_str());
 140         lua_setfield(L, -2, "name");
 141         lua_pushstring(L, i.description.c_str());
 142         lua_setfield(L, -2, "description");
 143         lua_pushstring(L, i.short_description.c_str());
 144         lua_setfield(L, -2, "short_description");
 145         lua_pushstring(L, type.c_str());
 146         lua_setfield(L, -2, "type");
 147         lua_pushstring(L, i.inventory_image.c_str());
 148         lua_setfield(L, -2, "inventory_image");
 149         lua_pushstring(L, i.inventory_overlay.c_str());
 150         lua_setfield(L, -2, "inventory_overlay");
 151         lua_pushstring(L, i.wield_image.c_str());
 152         lua_setfield(L, -2, "wield_image");
 153         lua_pushstring(L, i.wield_overlay.c_str());
 154         lua_setfield(L, -2, "wield_overlay");
 155         lua_pushstring(L, i.palette_image.c_str());
 156         lua_setfield(L, -2, "palette_image");
 157         push_ARGB8(L, i.color);
 158         lua_setfield(L, -2, "color");
 159         push_v3f(L, i.wield_scale);
 160         lua_setfield(L, -2, "wield_scale");
 161         lua_pushinteger(L, i.stack_max);
 162         lua_setfield(L, -2, "stack_max");
 163         lua_pushboolean(L, i.usable);
 164         lua_setfield(L, -2, "usable");
 165         lua_pushboolean(L, i.liquids_pointable);
 166         lua_setfield(L, -2, "liquids_pointable");
 167         if (i.tool_capabilities) {
 168                 push_tool_capabilities(L, *i.tool_capabilities);
 169                 lua_setfield(L, -2, "tool_capabilities");
 170         }
 171         push_groups(L, i.groups);
 172         lua_setfield(L, -2, "groups");
 173         push_soundspec(L, i.sound_place);
 174         lua_setfield(L, -2, "sound_place");
 175         push_soundspec(L, i.sound_place_failed);
 176         lua_setfield(L, -2, "sound_place_failed");
 177         lua_pushstring(L, i.node_placement_prediction.c_str());
 178         lua_setfield(L, -2, "node_placement_prediction");
 179 }
 180
 181 /******************************************************************************/
 182 void read_object_properties(lua_State *L, int index,
 183                 ServerActiveObject *sao, ObjectProperties *prop, IItemDefManager *idef)
 184 {
 185         if(index < 0)
 186                 index = lua_gettop(L) + 1 + index;
 187         if (lua_isnil(L, index))
 188                 return;
 189
 190         luaL_checktype(L, -1, LUA_TTABLE);
 191
 192         int hp_max = 0;
 193         if (getintfield(L, -1, "hp_max", hp_max)) {
 194                 prop->hp_max = (u16)rangelim(hp_max, 0, U16_MAX);
 195
 196                 if (prop->hp_max < sao->getHP()) {
 197                         PlayerHPChangeReason reason(PlayerHPChangeReason::SET_HP);
 198                         sao->setHP(prop->hp_max, reason);
 199                         if (sao->getType() == ACTIVEOBJECT_TYPE_PLAYER)
 200                                 sao->getEnv()->getGameDef()->SendPlayerHPOrDie((PlayerSAO *)sao, reason);
 201                 }
 202         }
 203
 204         if (getintfield(L, -1, "breath_max", prop->breath_max)) {
 205                 if (sao->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
 206                         PlayerSAO *player = (PlayerSAO *)sao;
 207                         if (prop->breath_max < player->getBreath())
 208                                 player->setBreath(prop->breath_max);
 209                 }
 210         }
 211         getboolfield(L, -1, "physical", prop->physical);
 212         getboolfield(L, -1, "collide_with_objects", prop->collideWithObjects);
 213
 214         lua_getfield(L, -1, "collisionbox");
 215         bool collisionbox_defined = lua_istable(L, -1);
 216         if (collisionbox_defined)
 217                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
 218         lua_pop(L, 1);
 219
 220         lua_getfield(L, -1, "selectionbox");
 221         if (lua_istable(L, -1))
 222                 prop->selectionbox = read_aabb3f(L, -1, 1.0);
 223         else if (collisionbox_defined)
 224                 prop->selectionbox = prop->collisionbox;
 225         lua_pop(L, 1);
 226
 227         getboolfield(L, -1, "pointable", prop->pointable);
 228         getstringfield(L, -1, "visual", prop->visual);
 229
 230         getstringfield(L, -1, "mesh", prop->mesh);
 231
 232         lua_getfield(L, -1, "visual_size");
 233         if (lua_istable(L, -1)) {
 234                 // Backwards compatibility: Also accept { x = ?, y = ? }
 235                 v2f scale_xy = read_v2f(L, -1);
 236
 237                 f32 scale_z = scale_xy.X;
 238                 lua_getfield(L, -1, "z");
 239                 if (lua_isnumber(L, -1))
 240                         scale_z = lua_tonumber(L, -1);
 241                 lua_pop(L, 1);
 242
 243                 prop->visual_size = v3f(scale_xy.X, scale_xy.Y, scale_z);
 244         }
 245         lua_pop(L, 1);
 246
 247         lua_getfield(L, -1, "textures");
 248         if(lua_istable(L, -1)){
 249                 prop->textures.clear();
 250                 int table = lua_gettop(L);
 251                 lua_pushnil(L);
 252                 while(lua_next(L, table) != 0){
 253                         // key at index -2 and value at index -1
 254                         if(lua_isstring(L, -1))
 255                                 prop->textures.emplace_back(lua_tostring(L, -1));
 256                         else
 257                                 prop->textures.emplace_back("");
 258                         // removes value, keeps key for next iteration
 259                         lua_pop(L, 1);
 260                 }
 261         }
 262         lua_pop(L, 1);
 263
 264         lua_getfield(L, -1, "colors");
 265         if (lua_istable(L, -1)) {
 266                 int table = lua_gettop(L);
 267                 prop->colors.clear();
 268                 for (lua_pushnil(L); lua_next(L, table); lua_pop(L, 1)) {
 269                         video::SColor color(255, 255, 255, 255);
 270                         read_color(L, -1, &color);
 271                         prop->colors.push_back(color);
 272                 }
 273         }
 274         lua_pop(L, 1);
 275
 276         lua_getfield(L, -1, "spritediv");
 277         if(lua_istable(L, -1))
 278                 prop->spritediv = read_v2s16(L, -1);
 279         lua_pop(L, 1);
 280
 281         lua_getfield(L, -1, "initial_sprite_basepos");
 282         if(lua_istable(L, -1))
 283                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 284         lua_pop(L, 1);
 285
 286         getboolfield(L, -1, "is_visible", prop->is_visible);
 287         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 288         if (getfloatfield(L, -1, "stepheight", prop->stepheight))
 289                 prop->stepheight *= BS;
 290         getfloatfield(L, -1, "eye_height", prop->eye_height);
 291
 292         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 293         lua_getfield(L, -1, "automatic_face_movement_dir");
 294         if (lua_isnumber(L, -1)) {
 295                 prop->automatic_face_movement_dir = true;
 296                 prop->automatic_face_movement_dir_offset = luaL_checknumber(L, -1);
 297         } else if (lua_isboolean(L, -1)) {
 298                 prop->automatic_face_movement_dir = lua_toboolean(L, -1);
 299                 prop->automatic_face_movement_dir_offset = 0.0;
 300         }
 301         lua_pop(L, 1);
 302         getboolfield(L, -1, "backface_culling", prop->backface_culling);
 303         getintfield(L, -1, "glow", prop->glow);
 304
 305         getstringfield(L, -1, "nametag", prop->nametag);
 306         lua_getfield(L, -1, "nametag_color");
 307         if (!lua_isnil(L, -1)) {
 308                 video::SColor color = prop->nametag_color;
 309                 if (read_color(L, -1, &color))
 310                         prop->nametag_color = color;
 311         }
 312         lua_pop(L, 1);
 313
 314         lua_getfield(L, -1, "automatic_face_movement_max_rotation_per_sec");
 315         if (lua_isnumber(L, -1)) {
 316                 prop->automatic_face_movement_max_rotation_per_sec = luaL_checknumber(L, -1);
 317         }
 318         lua_pop(L, 1);
 319
 320         getstringfield(L, -1, "infotext", prop->infotext);
 321         getboolfield(L, -1, "static_save", prop->static_save);
 322
 323         lua_getfield(L, -1, "wield_item");
 324         if (!lua_isnil(L, -1))
 325                 prop->wield_item = read_item(L, -1, idef).getItemString();
 326         lua_pop(L, 1);
 327
 328         getfloatfield(L, -1, "zoom_fov", prop->zoom_fov);
 329         getboolfield(L, -1, "use_texture_alpha", prop->use_texture_alpha);
 330         getboolfield(L, -1, "shaded", prop->shaded);
 331         getboolfield(L, -1, "show_on_minimap", prop->show_on_minimap);
 332
 333         getstringfield(L, -1, "damage_texture_modifier", prop->damage_texture_modifier);
 334 }
 335
 336 /******************************************************************************/
 337 void push_object_properties(lua_State *L, ObjectProperties *prop)
 338 {
 339         lua_newtable(L);
 340         lua_pushnumber(L, prop->hp_max);
 341         lua_setfield(L, -2, "hp_max");
 342         lua_pushnumber(L, prop->breath_max);
 343         lua_setfield(L, -2, "breath_max");
 344         lua_pushboolean(L, prop->physical);
 345         lua_setfield(L, -2, "physical");
 346         lua_pushboolean(L, prop->collideWithObjects);
 347         lua_setfield(L, -2, "collide_with_objects");
 348         push_aabb3f(L, prop->collisionbox);
 349         lua_setfield(L, -2, "collisionbox");
 350         push_aabb3f(L, prop->selectionbox);
 351         lua_setfield(L, -2, "selectionbox");
 352         lua_pushboolean(L, prop->pointable);
 353         lua_setfield(L, -2, "pointable");
 354         lua_pushlstring(L, prop->visual.c_str(), prop->visual.size());
 355         lua_setfield(L, -2, "visual");
 356         lua_pushlstring(L, prop->mesh.c_str(), prop->mesh.size());
 357         lua_setfield(L, -2, "mesh");
 358         push_v3f(L, prop->visual_size);
 359         lua_setfield(L, -2, "visual_size");
 360
 361         lua_createtable(L, prop->textures.size(), 0);
 362         u16 i = 1;
 363         for (const std::string &texture : prop->textures) {
 364                 lua_pushlstring(L, texture.c_str(), texture.size());
 365                 lua_rawseti(L, -2, i++);
 366         }
 367         lua_setfield(L, -2, "textures");
 368
 369         lua_createtable(L, prop->colors.size(), 0);
 370         i = 1;
 371         for (const video::SColor &color : prop->colors) {
 372                 push_ARGB8(L, color);
 373                 lua_rawseti(L, -2, i++);
 374         }
 375         lua_setfield(L, -2, "colors");
 376
 377         push_v2s16(L, prop->spritediv);
 378         lua_setfield(L, -2, "spritediv");
 379         push_v2s16(L, prop->initial_sprite_basepos);
 380         lua_setfield(L, -2, "initial_sprite_basepos");
 381         lua_pushboolean(L, prop->is_visible);
 382         lua_setfield(L, -2, "is_visible");
 383         lua_pushboolean(L, prop->makes_footstep_sound);
 384         lua_setfield(L, -2, "makes_footstep_sound");
 385         lua_pushnumber(L, prop->stepheight / BS);
 386         lua_setfield(L, -2, "stepheight");
 387         lua_pushnumber(L, prop->eye_height);
 388         lua_setfield(L, -2, "eye_height");
 389         lua_pushnumber(L, prop->automatic_rotate);
 390         lua_setfield(L, -2, "automatic_rotate");
 391         if (prop->automatic_face_movement_dir)
 392                 lua_pushnumber(L, prop->automatic_face_movement_dir_offset);
 393         else
 394                 lua_pushboolean(L, false);
 395         lua_setfield(L, -2, "automatic_face_movement_dir");
 396         lua_pushboolean(L, prop->backface_culling);
 397         lua_setfield(L, -2, "backface_culling");
 398         lua_pushnumber(L, prop->glow);
 399         lua_setfield(L, -2, "glow");
 400         lua_pushlstring(L, prop->nametag.c_str(), prop->nametag.size());
 401         lua_setfield(L, -2, "nametag");
 402         push_ARGB8(L, prop->nametag_color);
 403         lua_setfield(L, -2, "nametag_color");
 404         lua_pushnumber(L, prop->automatic_face_movement_max_rotation_per_sec);
 405         lua_setfield(L, -2, "automatic_face_movement_max_rotation_per_sec");
 406         lua_pushlstring(L, prop->infotext.c_str(), prop->infotext.size());
 407         lua_setfield(L, -2, "infotext");
 408         lua_pushboolean(L, prop->static_save);
 409         lua_setfield(L, -2, "static_save");
 410         lua_pushlstring(L, prop->wield_item.c_str(), prop->wield_item.size());
 411         lua_setfield(L, -2, "wield_item");
 412         lua_pushnumber(L, prop->zoom_fov);
 413         lua_setfield(L, -2, "zoom_fov");
 414         lua_pushboolean(L, prop->use_texture_alpha);
 415         lua_setfield(L, -2, "use_texture_alpha");
 416         lua_pushboolean(L, prop->shaded);
 417         lua_setfield(L, -2, "shaded");
 418         lua_pushlstring(L, prop->damage_texture_modifier.c_str(), prop->damage_texture_modifier.size());
 419         lua_setfield(L, -2, "damage_texture_modifier");
 420         lua_pushboolean(L, prop->show_on_minimap);
 421         lua_setfield(L, -2, "show_on_minimap");
 422 }
 423
 424 /******************************************************************************/
 425 TileDef read_tiledef(lua_State *L, int index, u8 drawtype)
 426 {
 427         if(index < 0)
 428                 index = lua_gettop(L) + 1 + index;
 429
 430         TileDef tiledef;
 431
 432         bool default_tiling = true;
 433         bool default_culling = true;
 434         switch (drawtype) {
 435                 case NDT_PLANTLIKE:
 436                 case NDT_PLANTLIKE_ROOTED:
 437                 case NDT_FIRELIKE:
 438                         default_tiling = false;
 439                         // "break" is omitted here intentionaly, as PLANTLIKE
 440                         // FIRELIKE drawtype both should default to having
 441                         // backface_culling to false.
 442                 case NDT_MESH:
 443                 case NDT_LIQUID:
 444                         default_culling = false;
 445                         break;
 446                 default:
 447                         break;
 448         }
 449
 450         // key at index -2 and value at index
 451         if(lua_isstring(L, index)){
 452                 // "default_lava.png"
 453                 tiledef.name = lua_tostring(L, index);
 454                 tiledef.tileable_vertical = default_tiling;
 455                 tiledef.tileable_horizontal = default_tiling;
 456                 tiledef.backface_culling = default_culling;
 457         }
 458         else if(lua_istable(L, index))
 459         {
 460                 // name="default_lava.png"
 461                 tiledef.name = "";
 462                 getstringfield(L, index, "name", tiledef.name);
 463                 getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
 464                 tiledef.backface_culling = getboolfield_default(
 465                         L, index, "backface_culling", default_culling);
 466                 tiledef.tileable_horizontal = getboolfield_default(
 467                         L, index, "tileable_horizontal", default_tiling);
 468                 tiledef.tileable_vertical = getboolfield_default(
 469                         L, index, "tileable_vertical", default_tiling);
 470                 std::string align_style;
 471                 if (getstringfield(L, index, "align_style", align_style)) {
 472                         if (align_style == "user")
 473                                 tiledef.align_style = ALIGN_STYLE_USER_DEFINED;
 474                         else if (align_style == "world")
 475                                 tiledef.align_style = ALIGN_STYLE_WORLD;
 476                         else
 477                                 tiledef.align_style = ALIGN_STYLE_NODE;
 478                 }
 479                 tiledef.scale = getintfield_default(L, index, "scale", 0);
 480                 // color = ...
 481                 lua_getfield(L, index, "color");
 482                 tiledef.has_color = read_color(L, -1, &tiledef.color);
 483                 lua_pop(L, 1);
 484                 // animation = {}
 485                 lua_getfield(L, index, "animation");
 486                 tiledef.animation = read_animation_definition(L, -1);
 487                 lua_pop(L, 1);
 488         }
 489
 490         return tiledef;
 491 }
 492
 493 /******************************************************************************/
 494 void read_content_features(lua_State *L, ContentFeatures &f, int index)
 495 {
 496         if(index < 0)
 497                 index = lua_gettop(L) + 1 + index;
 498
 499         /* Cache existence of some callbacks */
 500         lua_getfield(L, index, "on_construct");
 501         if(!lua_isnil(L, -1)) f.has_on_construct = true;
 502         lua_pop(L, 1);
 503         lua_getfield(L, index, "on_destruct");
 504         if(!lua_isnil(L, -1)) f.has_on_destruct = true;
 505         lua_pop(L, 1);
 506         lua_getfield(L, index, "after_destruct");
 507         if(!lua_isnil(L, -1)) f.has_after_destruct = true;
 508         lua_pop(L, 1);
 509
 510         lua_getfield(L, index, "on_rightclick");
 511         f.rightclickable = lua_isfunction(L, -1);
 512         lua_pop(L, 1);
 513
 514         /* Name */
 515         getstringfield(L, index, "name", f.name);
 516
 517         /* Groups */
 518         lua_getfield(L, index, "groups");
 519         read_groups(L, -1, f.groups);
 520         lua_pop(L, 1);
 521
 522         /* Visual definition */
 523
 524         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype",
 525                         ScriptApiNode::es_DrawType,NDT_NORMAL);
 526         getfloatfield(L, index, "visual_scale", f.visual_scale);
 527
 528         /* Meshnode model filename */
 529         getstringfield(L, index, "mesh", f.mesh);
 530
 531         // tiles = {}
 532         lua_getfield(L, index, "tiles");
 533         // If nil, try the deprecated name "tile_images" instead
 534         if(lua_isnil(L, -1)){
 535                 lua_pop(L, 1);
 536                 warn_if_field_exists(L, index, "tile_images",
 537                                 "Deprecated; new name is \"tiles\".");
 538                 lua_getfield(L, index, "tile_images");
 539         }
 540         if(lua_istable(L, -1)){
 541                 int table = lua_gettop(L);
 542                 lua_pushnil(L);
 543                 int i = 0;
 544                 while(lua_next(L, table) != 0){
 545                         // Read tiledef from value
 546                         f.tiledef[i] = read_tiledef(L, -1, f.drawtype);
 547                         // removes value, keeps key for next iteration
 548                         lua_pop(L, 1);
 549                         i++;
 550                         if(i==6){
 551                                 lua_pop(L, 1);
 552                                 break;
 553                         }
 554                 }
 555                 // Copy last value to all remaining textures
 556                 if(i >= 1){
 557                         TileDef lasttile = f.tiledef[i-1];
 558                         while(i < 6){
 559                                 f.tiledef[i] = lasttile;
 560                                 i++;
 561                         }
 562                 }
 563         }
 564         lua_pop(L, 1);
 565
 566         // overlay_tiles = {}
 567         lua_getfield(L, index, "overlay_tiles");
 568         if (lua_istable(L, -1)) {
 569                 int table = lua_gettop(L);
 570                 lua_pushnil(L);
 571                 int i = 0;
 572                 while (lua_next(L, table) != 0) {
 573                         // Read tiledef from value
 574                         f.tiledef_overlay[i] = read_tiledef(L, -1, f.drawtype);
 575                         // removes value, keeps key for next iteration
 576                         lua_pop(L, 1);
 577                         i++;
 578                         if (i == 6) {
 579                                 lua_pop(L, 1);
 580                                 break;
 581                         }
 582                 }
 583                 // Copy last value to all remaining textures
 584                 if (i >= 1) {
 585                         TileDef lasttile = f.tiledef_overlay[i - 1];
 586                         while (i < 6) {
 587                                 f.tiledef_overlay[i] = lasttile;
 588                                 i++;
 589                         }
 590                 }
 591         }
 592         lua_pop(L, 1);
 593
 594         // special_tiles = {}
 595         lua_getfield(L, index, "special_tiles");
 596         // If nil, try the deprecated name "special_materials" instead
 597         if(lua_isnil(L, -1)){
 598                 lua_pop(L, 1);
 599                 warn_if_field_exists(L, index, "special_materials",
 600                                 "Deprecated; new name is \"special_tiles\".");
 601                 lua_getfield(L, index, "special_materials");
 602         }
 603         if(lua_istable(L, -1)){
 604                 int table = lua_gettop(L);
 605                 lua_pushnil(L);
 606                 int i = 0;
 607                 while(lua_next(L, table) != 0){
 608                         // Read tiledef from value
 609                         f.tiledef_special[i] = read_tiledef(L, -1, f.drawtype);
 610                         // removes value, keeps key for next iteration
 611                         lua_pop(L, 1);
 612                         i++;
 613                         if(i==CF_SPECIAL_COUNT){
 614                                 lua_pop(L, 1);
 615                                 break;
 616                         }
 617                 }
 618         }
 619         lua_pop(L, 1);
 620
 621         /* alpha & use_texture_alpha */
 622         // This is a bit complicated due to compatibility
 623
 624         f.setDefaultAlphaMode();
 625
 626         warn_if_field_exists(L, index, "alpha",
 627                 "Obsolete, only limited compatibility provided; "
 628                 "replaced by \"use_texture_alpha\"");
 629         if (getintfield_default(L, index, "alpha", 255) != 255)
 630                 f.alpha = ALPHAMODE_BLEND;
 631
 632         lua_getfield(L, index, "use_texture_alpha");
 633         if (lua_isboolean(L, -1)) {
 634                 warn_if_field_exists(L, index, "use_texture_alpha",
 635                         "Boolean values are deprecated; use the new choices");
 636                 if (lua_toboolean(L, -1))
 637                         f.alpha = (f.drawtype == NDT_NORMAL) ? ALPHAMODE_CLIP : ALPHAMODE_BLEND;
 638         } else if (check_field_or_nil(L, -1, LUA_TSTRING, "use_texture_alpha")) {
 639                 int result = f.alpha;
 640                 string_to_enum(ScriptApiNode::es_TextureAlphaMode, result,
 641                                 std::string(lua_tostring(L, -1)));
 642                 f.alpha = static_cast<enum AlphaMode>(result);
 643         }
 644         lua_pop(L, 1);
 645
 646         /* Other stuff */
 647
 648         lua_getfield(L, index, "color");
 649         read_color(L, -1, &f.color);
 650         lua_pop(L, 1);
 651
 652         getstringfield(L, index, "palette", f.palette_name);
 653
 654         lua_getfield(L, index, "post_effect_color");
 655         read_color(L, -1, &f.post_effect_color);
 656         lua_pop(L, 1);
 657
 658         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
 659                         ScriptApiNode::es_ContentParamType, CPT_NONE);
 660         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
 661                         ScriptApiNode::es_ContentParamType2, CPT2_NONE);
 662
 663         if (!f.palette_name.empty() &&
 664                         !(f.param_type_2 == CPT2_COLOR ||
 665                         f.param_type_2 == CPT2_COLORED_FACEDIR ||
 666                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED))
 667                 warningstream << "Node " << f.name.c_str()
 668                         << " has a palette, but not a suitable paramtype2." << std::endl;
 669
 670         // True for all ground-like things like stone and mud, false for eg. trees
 671         getboolfield(L, index, "is_ground_content", f.is_ground_content);
 672         f.light_propagates = (f.param_type == CPT_LIGHT);
 673         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
 674         // This is used for collision detection.
 675         // Also for general solidness queries.
 676         getboolfield(L, index, "walkable", f.walkable);
 677         // Player can point to these
 678         getboolfield(L, index, "pointable", f.pointable);
 679         // Player can dig these
 680         getboolfield(L, index, "diggable", f.diggable);
 681         // Player can climb these
 682         getboolfield(L, index, "climbable", f.climbable);
 683         // Player can build on these
 684         getboolfield(L, index, "buildable_to", f.buildable_to);
 685         // Liquids flow into and replace node
 686         getboolfield(L, index, "floodable", f.floodable);
 687         // Whether the node is non-liquid, source liquid or flowing liquid
 688         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
 689                         ScriptApiNode::es_LiquidType, LIQUID_NONE);
 690         // If the content is liquid, this is the flowing version of the liquid.
 691         getstringfield(L, index, "liquid_alternative_flowing",
 692                         f.liquid_alternative_flowing);
 693         // If the content is liquid, this is the source version of the liquid.
 694         getstringfield(L, index, "liquid_alternative_source",
 695                         f.liquid_alternative_source);
 696         // Viscosity for fluid flow, ranging from 1 to 7, with
 697         // 1 giving almost instantaneous propagation and 7 being
 698         // the slowest possible
 699         f.liquid_viscosity = getintfield_default(L, index,
 700                         "liquid_viscosity", f.liquid_viscosity);
 701         f.liquid_range = getintfield_default(L, index,
 702                         "liquid_range", f.liquid_range);
 703         f.leveled = getintfield_default(L, index, "leveled", f.leveled);
 704         f.leveled_max = getintfield_default(L, index,
 705                         "leveled_max", f.leveled_max);
 706
 707         getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
 708         f.drowning = getintfield_default(L, index,
 709                         "drowning", f.drowning);
 710         // Amount of light the node emits
 711         f.light_source = getintfield_default(L, index,
 712                         "light_source", f.light_source);
 713         if (f.light_source > LIGHT_MAX) {
 714                 warningstream << "Node " << f.name.c_str()
 715                         << " had greater light_source than " << LIGHT_MAX
 716                         << ", it was reduced." << std::endl;
 717                 f.light_source = LIGHT_MAX;
 718         }
 719         f.damage_per_second = getintfield_default(L, index,
 720                         "damage_per_second", f.damage_per_second);
 721
 722         lua_getfield(L, index, "node_box");
 723         if(lua_istable(L, -1))
 724                 f.node_box = read_nodebox(L, -1);
 725         lua_pop(L, 1);
 726
 727         lua_getfield(L, index, "connects_to");
 728         if (lua_istable(L, -1)) {
 729                 int table = lua_gettop(L);
 730                 lua_pushnil(L);
 731                 while (lua_next(L, table) != 0) {
 732                         // Value at -1
 733                         f.connects_to.emplace_back(lua_tostring(L, -1));
 734                         lua_pop(L, 1);
 735                 }
 736         }
 737         lua_pop(L, 1);
 738
 739         lua_getfield(L, index, "connect_sides");
 740         if (lua_istable(L, -1)) {
 741                 int table = lua_gettop(L);
 742                 lua_pushnil(L);
 743                 while (lua_next(L, table) != 0) {
 744                         // Value at -1
 745                         std::string side(lua_tostring(L, -1));
 746                         // Note faces are flipped to make checking easier
 747                         if (side == "top")
 748                                 f.connect_sides |= 2;
 749                         else if (side == "bottom")
 750                                 f.connect_sides |= 1;
 751                         else if (side == "front")
 752                                 f.connect_sides |= 16;
 753                         else if (side == "left")
 754                                 f.connect_sides |= 32;
 755                         else if (side == "back")
 756                                 f.connect_sides |= 4;
 757                         else if (side == "right")
 758                                 f.connect_sides |= 8;
 759                         else
 760                                 warningstream << "Unknown value for \"connect_sides\": "
 761                                         << side << std::endl;
 762                         lua_pop(L, 1);
 763                 }
 764         }
 765         lua_pop(L, 1);
 766
 767         lua_getfield(L, index, "selection_box");
 768         if(lua_istable(L, -1))
 769                 f.selection_box = read_nodebox(L, -1);
 770         lua_pop(L, 1);
 771
 772         lua_getfield(L, index, "collision_box");
 773         if(lua_istable(L, -1))
 774                 f.collision_box = read_nodebox(L, -1);
 775         lua_pop(L, 1);
 776
 777         f.waving = getintfield_default(L, index,
 778                         "waving", f.waving);
 779
 780         // Set to true if paramtype used to be 'facedir_simple'
 781         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
 782         // Set to true if wall_mounted used to be set to true
 783         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
 784
 785         // Sound table
 786         lua_getfield(L, index, "sounds");
 787         if(lua_istable(L, -1)){
 788                 lua_getfield(L, -1, "footstep");
 789                 read_soundspec(L, -1, f.sound_footstep);
 790                 lua_pop(L, 1);
 791                 lua_getfield(L, -1, "dig");
 792                 read_soundspec(L, -1, f.sound_dig);
 793                 lua_pop(L, 1);
 794                 lua_getfield(L, -1, "dug");
 795                 read_soundspec(L, -1, f.sound_dug);
 796                 lua_pop(L, 1);
 797         }
 798         lua_pop(L, 1);
 799
 800         // Node immediately placed by client when node is dug
 801         getstringfield(L, index, "node_dig_prediction",
 802                 f.node_dig_prediction);
 803
 804 }
 805
 806 void push_content_features(lua_State *L, const ContentFeatures &c)
 807 {
 808         std::string paramtype(ScriptApiNode::es_ContentParamType[(int)c.param_type].str);
 809         std::string paramtype2(ScriptApiNode::es_ContentParamType2[(int)c.param_type_2].str);
 810         std::string drawtype(ScriptApiNode::es_DrawType[(int)c.drawtype].str);
 811         std::string liquid_type(ScriptApiNode::es_LiquidType[(int)c.liquid_type].str);
 812
 813         /* Missing "tiles" because I don't see a usecase (at least not yet). */
 814
 815         lua_newtable(L);
 816         lua_pushboolean(L, c.has_on_construct);
 817         lua_setfield(L, -2, "has_on_construct");
 818         lua_pushboolean(L, c.has_on_destruct);
 819         lua_setfield(L, -2, "has_on_destruct");
 820         lua_pushboolean(L, c.has_after_destruct);
 821         lua_setfield(L, -2, "has_after_destruct");
 822         lua_pushstring(L, c.name.c_str());
 823         lua_setfield(L, -2, "name");
 824         push_groups(L, c.groups);
 825         lua_setfield(L, -2, "groups");
 826         lua_pushstring(L, paramtype.c_str());
 827         lua_setfield(L, -2, "paramtype");
 828         lua_pushstring(L, paramtype2.c_str());
 829         lua_setfield(L, -2, "paramtype2");
 830         lua_pushstring(L, drawtype.c_str());
 831         lua_setfield(L, -2, "drawtype");
 832         if (!c.mesh.empty()) {
 833                 lua_pushstring(L, c.mesh.c_str());
 834                 lua_setfield(L, -2, "mesh");
 835         }
 836 #ifndef SERVER
 837         push_ARGB8(L, c.minimap_color);       // I know this is not set-able w/ register_node,
 838         lua_setfield(L, -2, "minimap_color"); // but the people need to know!
 839 #endif
 840         lua_pushnumber(L, c.visual_scale);
 841         lua_setfield(L, -2, "visual_scale");
 842         lua_pushnumber(L, c.alpha);
 843         lua_setfield(L, -2, "alpha");
 844         if (!c.palette_name.empty()) {
 845                 push_ARGB8(L, c.color);
 846                 lua_setfield(L, -2, "color");
 847
 848                 lua_pushstring(L, c.palette_name.c_str());
 849                 lua_setfield(L, -2, "palette_name");
 850
 851                 push_palette(L, c.palette);
 852                 lua_setfield(L, -2, "palette");
 853         }
 854         lua_pushnumber(L, c.waving);
 855         lua_setfield(L, -2, "waving");
 856         lua_pushnumber(L, c.connect_sides);
 857         lua_setfield(L, -2, "connect_sides");
 858
 859         lua_createtable(L, c.connects_to.size(), 0);
 860         u16 i = 1;
 861         for (const std::string &it : c.connects_to) {
 862                 lua_pushlstring(L, it.c_str(), it.size());
 863                 lua_rawseti(L, -2, i++);
 864         }
 865         lua_setfield(L, -2, "connects_to");
 866
 867         push_ARGB8(L, c.post_effect_color);
 868         lua_setfield(L, -2, "post_effect_color");
 869         lua_pushnumber(L, c.leveled);
 870         lua_setfield(L, -2, "leveled");
 871         lua_pushnumber(L, c.leveled_max);
 872         lua_setfield(L, -2, "leveled_max");
 873         lua_pushboolean(L, c.sunlight_propagates);
 874         lua_setfield(L, -2, "sunlight_propagates");
 875         lua_pushnumber(L, c.light_source);
 876         lua_setfield(L, -2, "light_source");
 877         lua_pushboolean(L, c.is_ground_content);
 878         lua_setfield(L, -2, "is_ground_content");
 879         lua_pushboolean(L, c.walkable);
 880         lua_setfield(L, -2, "walkable");
 881         lua_pushboolean(L, c.pointable);
 882         lua_setfield(L, -2, "pointable");
 883         lua_pushboolean(L, c.diggable);
 884         lua_setfield(L, -2, "diggable");
 885         lua_pushboolean(L, c.climbable);
 886         lua_setfield(L, -2, "climbable");
 887         lua_pushboolean(L, c.buildable_to);
 888         lua_setfield(L, -2, "buildable_to");
 889         lua_pushboolean(L, c.rightclickable);
 890         lua_setfield(L, -2, "rightclickable");
 891         lua_pushnumber(L, c.damage_per_second);
 892         lua_setfield(L, -2, "damage_per_second");
 893         if (c.isLiquid()) {
 894                 lua_pushstring(L, liquid_type.c_str());
 895                 lua_setfield(L, -2, "liquid_type");
 896                 lua_pushstring(L, c.liquid_alternative_flowing.c_str());
 897                 lua_setfield(L, -2, "liquid_alternative_flowing");
 898                 lua_pushstring(L, c.liquid_alternative_source.c_str());
 899                 lua_setfield(L, -2, "liquid_alternative_source");
 900                 lua_pushnumber(L, c.liquid_viscosity);
 901                 lua_setfield(L, -2, "liquid_viscosity");
 902                 lua_pushboolean(L, c.liquid_renewable);
 903                 lua_setfield(L, -2, "liquid_renewable");
 904                 lua_pushnumber(L, c.liquid_range);
 905                 lua_setfield(L, -2, "liquid_range");
 906         }
 907         lua_pushnumber(L, c.drowning);
 908         lua_setfield(L, -2, "drowning");
 909         lua_pushboolean(L, c.floodable);
 910         lua_setfield(L, -2, "floodable");
 911         push_nodebox(L, c.node_box);
 912         lua_setfield(L, -2, "node_box");
 913         push_nodebox(L, c.selection_box);
 914         lua_setfield(L, -2, "selection_box");
 915         push_nodebox(L, c.collision_box);
 916         lua_setfield(L, -2, "collision_box");
 917         lua_newtable(L);
 918         push_soundspec(L, c.sound_footstep);
 919         lua_setfield(L, -2, "sound_footstep");
 920         push_soundspec(L, c.sound_dig);
 921         lua_setfield(L, -2, "sound_dig");
 922         push_soundspec(L, c.sound_dug);
 923         lua_setfield(L, -2, "sound_dug");
 924         lua_setfield(L, -2, "sounds");
 925         lua_pushboolean(L, c.legacy_facedir_simple);
 926         lua_setfield(L, -2, "legacy_facedir_simple");
 927         lua_pushboolean(L, c.legacy_wallmounted);
 928         lua_setfield(L, -2, "legacy_wallmounted");
 929         lua_pushstring(L, c.node_dig_prediction.c_str());
 930         lua_setfield(L, -2, "node_dig_prediction");
 931 }
 932
 933 /******************************************************************************/
 934 void push_nodebox(lua_State *L, const NodeBox &box)
 935 {
 936         lua_newtable(L);
 937         switch (box.type)
 938         {
 939                 case NODEBOX_REGULAR:
 940                         lua_pushstring(L, "regular");
 941                         lua_setfield(L, -2, "type");
 942                         break;
 943                 case NODEBOX_LEVELED:
 944                 case NODEBOX_FIXED:
 945                         lua_pushstring(L, "fixed");
 946                         lua_setfield(L, -2, "type");
 947                         push_box(L, box.fixed);
 948                         lua_setfield(L, -2, "fixed");
 949                         break;
 950                 case NODEBOX_WALLMOUNTED:
 951                         lua_pushstring(L, "wallmounted");
 952                         lua_setfield(L, -2, "type");
 953                         push_aabb3f(L, box.wall_top);
 954                         lua_setfield(L, -2, "wall_top");
 955                         push_aabb3f(L, box.wall_bottom);
 956                         lua_setfield(L, -2, "wall_bottom");
 957                         push_aabb3f(L, box.wall_side);
 958                         lua_setfield(L, -2, "wall_side");
 959                         break;
 960                 case NODEBOX_CONNECTED:
 961                         lua_pushstring(L, "connected");
 962                         lua_setfield(L, -2, "type");
 963                         push_box(L, box.connect_top);
 964                         lua_setfield(L, -2, "connect_top");
 965                         push_box(L, box.connect_bottom);
 966                         lua_setfield(L, -2, "connect_bottom");
 967                         push_box(L, box.connect_front);
 968                         lua_setfield(L, -2, "connect_front");
 969                         push_box(L, box.connect_back);
 970                         lua_setfield(L, -2, "connect_back");
 971                         push_box(L, box.connect_left);
 972                         lua_setfield(L, -2, "connect_left");
 973                         push_box(L, box.connect_right);
 974                         lua_setfield(L, -2, "connect_right");
 975                         break;
 976                 default:
 977                         FATAL_ERROR("Invalid box.type");
 978                         break;
 979         }
 980 }
 981
 982 void push_box(lua_State *L, const std::vector<aabb3f> &box)
 983 {
 984         lua_createtable(L, box.size(), 0);
 985         u8 i = 1;
 986         for (const aabb3f &it : box) {
 987                 push_aabb3f(L, it);
 988                 lua_rawseti(L, -2, i++);
 989         }
 990 }
 991
 992 /******************************************************************************/
 993 void push_palette(lua_State *L, const std::vector<video::SColor> *palette)
 994 {
 995         lua_createtable(L, palette->size(), 0);
 996         int newTable = lua_gettop(L);
 997         int index = 1;
 998         std::vector<video::SColor>::const_iterator iter;
 999         for (iter = palette->begin(); iter != palette->end(); ++iter) {
1000                 push_ARGB8(L, (*iter));
1001                 lua_rawseti(L, newTable, index);
1002                 index++;
1003         }
1004 }
1005
1006 /******************************************************************************/
1007 void read_server_sound_params(lua_State *L, int index,
1008                 ServerSoundParams &params)
1009 {
1010         if(index < 0)
1011                 index = lua_gettop(L) + 1 + index;
1012         // Clear
1013         params = ServerSoundParams();
1014         if(lua_istable(L, index)){
1015                 getfloatfield(L, index, "gain", params.gain);
1016                 getstringfield(L, index, "to_player", params.to_player);
1017                 getfloatfield(L, index, "fade", params.fade);
1018                 getfloatfield(L, index, "pitch", params.pitch);
1019                 lua_getfield(L, index, "pos");
1020                 if(!lua_isnil(L, -1)){
1021                         v3f p = read_v3f(L, -1)*BS;
1022                         params.pos = p;
1023                         params.type = ServerSoundParams::SSP_POSITIONAL;
1024                 }
1025                 lua_pop(L, 1);
1026                 lua_getfield(L, index, "object");
1027                 if(!lua_isnil(L, -1)){
1028                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
1029                         ServerActiveObject *sao = ObjectRef::getobject(ref);
1030                         if(sao){
1031                                 params.object = sao->getId();
1032                                 params.type = ServerSoundParams::SSP_OBJECT;
1033                         }
1034                 }
1035                 lua_pop(L, 1);
1036                 params.max_hear_distance = BS*getfloatfield_default(L, index,
1037                                 "max_hear_distance", params.max_hear_distance/BS);
1038                 getboolfield(L, index, "loop", params.loop);
1039                 getstringfield(L, index, "exclude_player", params.exclude_player);
1040         }
1041 }
1042
1043 /******************************************************************************/
1044 void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
1045 {
1046         if(index < 0)
1047                 index = lua_gettop(L) + 1 + index;
1048         if (lua_isnil(L, index))
1049                 return;
1050
1051         if (lua_istable(L, index)) {
1052                 getstringfield(L, index, "name", spec.name);
1053                 getfloatfield(L, index, "gain", spec.gain);
1054                 getfloatfield(L, index, "fade", spec.fade);
1055                 getfloatfield(L, index, "pitch", spec.pitch);
1056         } else if (lua_isstring(L, index)) {
1057                 spec.name = lua_tostring(L, index);
1058         }
1059 }
1060
1061 void push_soundspec(lua_State *L, const SimpleSoundSpec &spec)
1062 {
1063         lua_createtable(L, 0, 3);
1064         lua_pushstring(L, spec.name.c_str());
1065         lua_setfield(L, -2, "name");
1066         lua_pushnumber(L, spec.gain);
1067         lua_setfield(L, -2, "gain");
1068         lua_pushnumber(L, spec.fade);
1069         lua_setfield(L, -2, "fade");
1070         lua_pushnumber(L, spec.pitch);
1071         lua_setfield(L, -2, "pitch");
1072 }
1073
1074 /******************************************************************************/
1075 NodeBox read_nodebox(lua_State *L, int index)
1076 {
1077         NodeBox nodebox;
1078         if (lua_isnil(L, -1))
1079                 return nodebox;
1080
1081         luaL_checktype(L, -1, LUA_TTABLE);
1082
1083         nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
1084                         ScriptApiNode::es_NodeBoxType, NODEBOX_REGULAR);
1085
1086 #define NODEBOXREAD(n, s){ \
1087                 lua_getfield(L, index, (s)); \
1088                 if (lua_istable(L, -1)) \
1089                         (n) = read_aabb3f(L, -1, BS); \
1090                 lua_pop(L, 1); \
1091         }
1092
1093 #define NODEBOXREADVEC(n, s) \
1094         lua_getfield(L, index, (s)); \
1095         if (lua_istable(L, -1)) \
1096                 (n) = read_aabb3f_vector(L, -1, BS); \
1097         lua_pop(L, 1);
1098
1099         NODEBOXREADVEC(nodebox.fixed, "fixed");
1100         NODEBOXREAD(nodebox.wall_top, "wall_top");
1101         NODEBOXREAD(nodebox.wall_bottom, "wall_bottom");
1102         NODEBOXREAD(nodebox.wall_side, "wall_side");
1103         NODEBOXREADVEC(nodebox.connect_top, "connect_top");
1104         NODEBOXREADVEC(nodebox.connect_bottom, "connect_bottom");
1105         NODEBOXREADVEC(nodebox.connect_front, "connect_front");
1106         NODEBOXREADVEC(nodebox.connect_left, "connect_left");
1107         NODEBOXREADVEC(nodebox.connect_back, "connect_back");
1108         NODEBOXREADVEC(nodebox.connect_right, "connect_right");
1109         NODEBOXREADVEC(nodebox.disconnected_top, "disconnected_top");
1110         NODEBOXREADVEC(nodebox.disconnected_bottom, "disconnected_bottom");
1111         NODEBOXREADVEC(nodebox.disconnected_front, "disconnected_front");
1112         NODEBOXREADVEC(nodebox.disconnected_left, "disconnected_left");
1113         NODEBOXREADVEC(nodebox.disconnected_back, "disconnected_back");
1114         NODEBOXREADVEC(nodebox.disconnected_right, "disconnected_right");
1115         NODEBOXREADVEC(nodebox.disconnected, "disconnected");
1116         NODEBOXREADVEC(nodebox.disconnected_sides, "disconnected_sides");
1117
1118         return nodebox;
1119 }
1120
1121 /******************************************************************************/
1122 MapNode readnode(lua_State *L, int index, const NodeDefManager *ndef)
1123 {
1124         lua_getfield(L, index, "name");
1125         if (!lua_isstring(L, -1))
1126                 throw LuaError("Node name is not set or is not a string!");
1127         std::string name = lua_tostring(L, -1);
1128         lua_pop(L, 1);
1129
1130         u8 param1 = 0;
1131         lua_getfield(L, index, "param1");
1132         if (!lua_isnil(L, -1))
1133                 param1 = lua_tonumber(L, -1);
1134         lua_pop(L, 1);
1135
1136         u8 param2 = 0;
1137         lua_getfield(L, index, "param2");
1138         if (!lua_isnil(L, -1))
1139                 param2 = lua_tonumber(L, -1);
1140         lua_pop(L, 1);
1141
1142         content_t id = CONTENT_IGNORE;
1143         if (!ndef->getId(name, id))
1144                 throw LuaError("\"" + name + "\" is not a registered node!");
1145
1146         return {id, param1, param2};
1147 }
1148
1149 /******************************************************************************/
1150 void pushnode(lua_State *L, const MapNode &n, const NodeDefManager *ndef)
1151 {
1152         lua_createtable(L, 0, 3);
1153         lua_pushstring(L, ndef->get(n).name.c_str());
1154         lua_setfield(L, -2, "name");
1155         lua_pushinteger(L, n.getParam1());
1156         lua_setfield(L, -2, "param1");
1157         lua_pushinteger(L, n.getParam2());
1158         lua_setfield(L, -2, "param2");
1159 }
1160
1161 /******************************************************************************/
1162 void warn_if_field_exists(lua_State *L, int table,
1163                 const char *name, const std::string &message)
1164 {
1165         lua_getfield(L, table, name);
1166         if (!lua_isnil(L, -1)) {
1167                 warningstream << "Field \"" << name << "\": "
1168                                 << message << std::endl;
1169                 infostream << script_get_backtrace(L) << std::endl;
1170         }
1171         lua_pop(L, 1);
1172 }
1173
1174 /******************************************************************************/
1175 int getenumfield(lua_State *L, int table,
1176                 const char *fieldname, const EnumString *spec, int default_)
1177 {
1178         int result = default_;
1179         string_to_enum(spec, result,
1180                         getstringfield_default(L, table, fieldname, ""));
1181         return result;
1182 }
1183
1184 /******************************************************************************/
1185 bool string_to_enum(const EnumString *spec, int &result,
1186                 const std::string &str)
1187 {
1188         const EnumString *esp = spec;
1189         while(esp->str){
1190                 if (!strcmp(str.c_str(), esp->str)) {
1191                         result = esp->num;
1192                         return true;
1193                 }
1194                 esp++;
1195         }
1196         return false;
1197 }
1198
1199 /******************************************************************************/
1200 ItemStack read_item(lua_State* L, int index, IItemDefManager *idef)
1201 {
1202         if(index < 0)
1203                 index = lua_gettop(L) + 1 + index;
1204
1205         if (lua_isnil(L, index)) {
1206                 return ItemStack();
1207         }
1208
1209         if (lua_isuserdata(L, index)) {
1210                 // Convert from LuaItemStack
1211                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
1212                 return o->getItem();
1213         }
1214
1215         if (lua_isstring(L, index)) {
1216                 // Convert from itemstring
1217                 std::string itemstring = lua_tostring(L, index);
1218                 try
1219                 {
1220                         ItemStack item;
1221                         item.deSerialize(itemstring, idef);
1222                         return item;
1223                 }
1224                 catch(SerializationError &e)
1225                 {
1226                         warningstream<<"unable to create item from itemstring"
1227                                         <<": "<<itemstring<<std::endl;
1228                         return ItemStack();
1229                 }
1230         }
1231         else if(lua_istable(L, index))
1232         {
1233                 // Convert from table
1234                 std::string name = getstringfield_default(L, index, "name", "");
1235                 int count = getintfield_default(L, index, "count", 1);
1236                 int wear = getintfield_default(L, index, "wear", 0);
1237
1238                 ItemStack istack(name, count, wear, idef);
1239
1240                 // BACKWARDS COMPATIBLITY
1241                 std::string value = getstringfield_default(L, index, "metadata", "");
1242                 istack.metadata.setString("", value);
1243
1244                 // Get meta
1245                 lua_getfield(L, index, "meta");
1246                 int fieldstable = lua_gettop(L);
1247                 if (lua_istable(L, fieldstable)) {
1248                         lua_pushnil(L);
1249                         while (lua_next(L, fieldstable) != 0) {
1250                                 // key at index -2 and value at index -1
1251                                 std::string key = lua_tostring(L, -2);
1252                                 size_t value_len;
1253                                 const char *value_cs = lua_tolstring(L, -1, &value_len);
1254                                 std::string value(value_cs, value_len);
1255                                 istack.metadata.setString(key, value);
1256                                 lua_pop(L, 1); // removes value, keeps key for next iteration
1257                         }
1258                 }
1259
1260                 return istack;
1261         } else {
1262                 throw LuaError("Expecting itemstack, itemstring, table or nil");
1263         }
1264 }
1265
1266 /******************************************************************************/
1267 void push_tool_capabilities(lua_State *L,
1268                 const ToolCapabilities &toolcap)
1269 {
1270         lua_newtable(L);
1271         setfloatfield(L, -1, "full_punch_interval", toolcap.full_punch_interval);
1272         setintfield(L, -1, "max_drop_level", toolcap.max_drop_level);
1273         setintfield(L, -1, "punch_attack_uses", toolcap.punch_attack_uses);
1274                 // Create groupcaps table
1275                 lua_newtable(L);
1276                 // For each groupcap
1277                 for (const auto &gc_it : toolcap.groupcaps) {
1278                         // Create groupcap table
1279                         lua_newtable(L);
1280                         const std::string &name = gc_it.first;
1281                         const ToolGroupCap &groupcap = gc_it.second;
1282                         // Create subtable "times"
1283                         lua_newtable(L);
1284                         for (auto time : groupcap.times) {
1285                                 lua_pushinteger(L, time.first);
1286                                 lua_pushnumber(L, time.second);
1287                                 lua_settable(L, -3);
1288                         }
1289                         // Set subtable "times"
1290                         lua_setfield(L, -2, "times");
1291                         // Set simple parameters
1292                         setintfield(L, -1, "maxlevel", groupcap.maxlevel);
1293                         setintfield(L, -1, "uses", groupcap.uses);
1294                         // Insert groupcap table into groupcaps table
1295                         lua_setfield(L, -2, name.c_str());
1296                 }
1297                 // Set groupcaps table
1298                 lua_setfield(L, -2, "groupcaps");
1299                 //Create damage_groups table
1300                 lua_newtable(L);
1301                 // For each damage group
1302                 for (const auto &damageGroup : toolcap.damageGroups) {
1303                         // Create damage group table
1304                         lua_pushinteger(L, damageGroup.second);
1305                         lua_setfield(L, -2, damageGroup.first.c_str());
1306                 }
1307                 lua_setfield(L, -2, "damage_groups");
1308 }
1309
1310 /******************************************************************************/
1311 void push_inventory_list(lua_State *L, Inventory *inv, const char *name)
1312 {
1313         InventoryList *invlist = inv->getList(name);
1314         if(invlist == NULL){
1315                 lua_pushnil(L);
1316                 return;
1317         }
1318         std::vector<ItemStack> items;
1319         for(u32 i=0; i<invlist->getSize(); i++)
1320                 items.push_back(invlist->getItem(i));
1321         push_items(L, items);
1322 }
1323
1324 /******************************************************************************/
1325 void read_inventory_list(lua_State *L, int tableindex,
1326                 Inventory *inv, const char *name, Server* srv, int forcesize)
1327 {
1328         if(tableindex < 0)
1329                 tableindex = lua_gettop(L) + 1 + tableindex;
1330         // If nil, delete list
1331         if(lua_isnil(L, tableindex)){
1332                 inv->deleteList(name);
1333                 return;
1334         }
1335         // Otherwise set list
1336         std::vector<ItemStack> items = read_items(L, tableindex,srv);
1337         int listsize = (forcesize != -1) ? forcesize : items.size();
1338         InventoryList *invlist = inv->addList(name, listsize);
1339         int index = 0;
1340         for(std::vector<ItemStack>::const_iterator
1341                         i = items.begin(); i != items.end(); ++i){
1342                 if(forcesize != -1 && index == forcesize)
1343                         break;
1344                 invlist->changeItem(index, *i);
1345                 index++;
1346         }
1347         while(forcesize != -1 && index < forcesize){
1348                 invlist->deleteItem(index);
1349                 index++;
1350         }
1351 }
1352
1353 /******************************************************************************/
1354 struct TileAnimationParams read_animation_definition(lua_State *L, int index)
1355 {
1356         if(index < 0)
1357                 index = lua_gettop(L) + 1 + index;
1358
1359         struct TileAnimationParams anim;
1360         anim.type = TAT_NONE;
1361         if (!lua_istable(L, index))
1362                 return anim;
1363
1364         anim.type = (TileAnimationType)
1365                 getenumfield(L, index, "type", es_TileAnimationType,
1366                 TAT_NONE);
1367         if (anim.type == TAT_VERTICAL_FRAMES) {
1368                 // {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
1369                 anim.vertical_frames.aspect_w =
1370                         getintfield_default(L, index, "aspect_w", 16);
1371                 anim.vertical_frames.aspect_h =
1372                         getintfield_default(L, index, "aspect_h", 16);
1373                 anim.vertical_frames.length =
1374                         getfloatfield_default(L, index, "length", 1.0);
1375         } else if (anim.type == TAT_SHEET_2D) {
1376                 // {type="sheet_2d", frames_w=5, frames_h=3, frame_length=0.5}
1377                 getintfield(L, index, "frames_w",
1378                         anim.sheet_2d.frames_w);
1379                 getintfield(L, index, "frames_h",
1380                         anim.sheet_2d.frames_h);
1381                 getfloatfield(L, index, "frame_length",
1382                         anim.sheet_2d.frame_length);
1383         }
1384
1385         return anim;
1386 }
1387
1388 /******************************************************************************/
1389 ToolCapabilities read_tool_capabilities(
1390                 lua_State *L, int table)
1391 {
1392         ToolCapabilities toolcap;
1393         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
1394         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
1395         getintfield(L, table, "punch_attack_uses", toolcap.punch_attack_uses);
1396         lua_getfield(L, table, "groupcaps");
1397         if(lua_istable(L, -1)){
1398                 int table_groupcaps = lua_gettop(L);
1399                 lua_pushnil(L);
1400                 while(lua_next(L, table_groupcaps) != 0){
1401                         // key at index -2 and value at index -1
1402                         std::string groupname = luaL_checkstring(L, -2);
1403                         if(lua_istable(L, -1)){
1404                                 int table_groupcap = lua_gettop(L);
1405                                 // This will be created
1406                                 ToolGroupCap groupcap;
1407                                 // Read simple parameters
1408                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
1409                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
1410                                 // DEPRECATED: maxwear
1411                                 float maxwear = 0;
1412                                 if (getfloatfield(L, table_groupcap, "maxwear", maxwear)){
1413                                         if (maxwear != 0)
1414                                                 groupcap.uses = 1.0/maxwear;
1415                                         else
1416                                                 groupcap.uses = 0;
1417                                         warningstream << "Field \"maxwear\" is deprecated; "
1418                                                         << "replace with uses=1/maxwear" << std::endl;
1419                                         infostream << script_get_backtrace(L) << std::endl;
1420                                 }
1421                                 // Read "times" table
1422                                 lua_getfield(L, table_groupcap, "times");
1423                                 if(lua_istable(L, -1)){
1424                                         int table_times = lua_gettop(L);
1425                                         lua_pushnil(L);
1426                                         while(lua_next(L, table_times) != 0){
1427                                                 // key at index -2 and value at index -1
1428                                                 int rating = luaL_checkinteger(L, -2);
1429                                                 float time = luaL_checknumber(L, -1);
1430                                                 groupcap.times[rating] = time;
1431                                                 // removes value, keeps key for next iteration
1432                                                 lua_pop(L, 1);
1433                                         }
1434                                 }
1435                                 lua_pop(L, 1);
1436                                 // Insert groupcap into toolcap
1437                                 toolcap.groupcaps[groupname] = groupcap;
1438                         }
1439                         // removes value, keeps key for next iteration
1440                         lua_pop(L, 1);
1441                 }
1442         }
1443         lua_pop(L, 1);
1444
1445         lua_getfield(L, table, "damage_groups");
1446         if(lua_istable(L, -1)){
1447                 int table_damage_groups = lua_gettop(L);
1448                 lua_pushnil(L);
1449                 while(lua_next(L, table_damage_groups) != 0){
1450                         // key at index -2 and value at index -1
1451                         std::string groupname = luaL_checkstring(L, -2);
1452                         u16 value = luaL_checkinteger(L, -1);
1453                         toolcap.damageGroups[groupname] = value;
1454                         // removes value, keeps key for next iteration
1455                         lua_pop(L, 1);
1456                 }
1457         }
1458         lua_pop(L, 1);
1459         return toolcap;
1460 }
1461
1462 /******************************************************************************/
1463 void push_dig_params(lua_State *L,const DigParams &params)
1464 {
1465         lua_createtable(L, 0, 3);
1466         setboolfield(L, -1, "diggable", params.diggable);
1467         setfloatfield(L, -1, "time", params.time);
1468         setintfield(L, -1, "wear", params.wear);
1469 }
1470
1471 /******************************************************************************/
1472 void push_hit_params(lua_State *L,const HitParams &params)
1473 {
1474         lua_createtable(L, 0, 3);
1475         setintfield(L, -1, "hp", params.hp);
1476         setintfield(L, -1, "wear", params.wear);
1477 }
1478
1479 /******************************************************************************/
1480
1481 bool getflagsfield(lua_State *L, int table, const char *fieldname,
1482         FlagDesc *flagdesc, u32 *flags, u32 *flagmask)
1483 {
1484         lua_getfield(L, table, fieldname);
1485
1486         bool success = read_flags(L, -1, flagdesc, flags, flagmask);
1487
1488         lua_pop(L, 1);
1489
1490         return success;
1491 }
1492
1493 bool read_flags(lua_State *L, int index, FlagDesc *flagdesc,
1494         u32 *flags, u32 *flagmask)
1495 {
1496         if (lua_isstring(L, index)) {
1497                 std::string flagstr = lua_tostring(L, index);
1498                 *flags = readFlagString(flagstr, flagdesc, flagmask);
1499         } else if (lua_istable(L, index)) {
1500                 *flags = read_flags_table(L, index, flagdesc, flagmask);
1501         } else {
1502                 return false;
1503         }
1504
1505         return true;
1506 }
1507
1508 u32 read_flags_table(lua_State *L, int table, FlagDesc *flagdesc, u32 *flagmask)
1509 {
1510         u32 flags = 0, mask = 0;
1511         char fnamebuf[64] = "no";
1512
1513         for (int i = 0; flagdesc[i].name; i++) {
1514                 bool result;
1515
1516                 if (getboolfield(L, table, flagdesc[i].name, result)) {
1517                         mask |= flagdesc[i].flag;
1518                         if (result)
1519                                 flags |= flagdesc[i].flag;
1520                 }
1521
1522                 strlcpy(fnamebuf + 2, flagdesc[i].name, sizeof(fnamebuf) - 2);
1523                 if (getboolfield(L, table, fnamebuf, result))
1524                         mask |= flagdesc[i].flag;
1525         }
1526
1527         if (flagmask)
1528                 *flagmask = mask;
1529
1530         return flags;
1531 }
1532
1533 void push_flags_string(lua_State *L, FlagDesc *flagdesc, u32 flags, u32 flagmask)
1534 {
1535         std::string flagstring = writeFlagString(flags, flagdesc, flagmask);
1536         lua_pushlstring(L, flagstring.c_str(), flagstring.size());
1537 }
1538
1539 /******************************************************************************/
1540 /* Lua Stored data!                                                           */
1541 /******************************************************************************/
1542
1543 /******************************************************************************/
1544 void read_groups(lua_State *L, int index, ItemGroupList &result)
1545 {
1546         if (lua_isnil(L, index))
1547                 return;
1548
1549         luaL_checktype(L, index, LUA_TTABLE);
1550
1551         result.clear();
1552         lua_pushnil(L);
1553         if (index < 0)
1554                 index -= 1;
1555         while (lua_next(L, index) != 0) {
1556                 // key at index -2 and value at index -1
1557                 std::string name = luaL_checkstring(L, -2);
1558                 int rating = luaL_checkinteger(L, -1);
1559                 // zero rating indicates not in the group
1560                 if (rating != 0)
1561                         result[name] = rating;
1562                 // removes value, keeps key for next iteration
1563                 lua_pop(L, 1);
1564         }
1565 }
1566
1567 /******************************************************************************/
1568 void push_groups(lua_State *L, const ItemGroupList &groups)
1569 {
1570         lua_createtable(L, 0, groups.size());
1571         for (const auto &group : groups) {
1572                 lua_pushinteger(L, group.second);
1573                 lua_setfield(L, -2, group.first.c_str());
1574         }
1575 }
1576
1577 /******************************************************************************/
1578 void push_items(lua_State *L, const std::vector<ItemStack> &items)
1579 {
1580         lua_createtable(L, items.size(), 0);
1581         for (u32 i = 0; i != items.size(); i++) {
1582                 LuaItemStack::create(L, items[i]);
1583                 lua_rawseti(L, -2, i + 1);
1584         }
1585 }
1586
1587 /******************************************************************************/
1588 std::vector<ItemStack> read_items(lua_State *L, int index, Server *srv)
1589 {
1590         if(index < 0)
1591                 index = lua_gettop(L) + 1 + index;
1592
1593         std::vector<ItemStack> items;
1594         luaL_checktype(L, index, LUA_TTABLE);
1595         lua_pushnil(L);
1596         while (lua_next(L, index)) {
1597                 s32 key = luaL_checkinteger(L, -2);
1598                 if (key < 1) {
1599                         throw LuaError("Invalid inventory list index");
1600                 }
1601                 if (items.size() < (u32) key) {
1602                         items.resize(key);
1603                 }
1604                 items[key - 1] = read_item(L, -1, srv->idef());
1605                 lua_pop(L, 1);
1606         }
1607         return items;
1608 }
1609
1610 /******************************************************************************/
1611 void luaentity_get(lua_State *L, u16 id)
1612 {
1613         // Get luaentities[i]
1614         lua_getglobal(L, "core");
1615         lua_getfield(L, -1, "luaentities");
1616         luaL_checktype(L, -1, LUA_TTABLE);
1617         lua_pushinteger(L, id);
1618         lua_gettable(L, -2);
1619         lua_remove(L, -2); // Remove luaentities
1620         lua_remove(L, -2); // Remove core
1621 }
1622
1623 /******************************************************************************/
1624 bool read_noiseparams(lua_State *L, int index, NoiseParams *np)
1625 {
1626         if (index < 0)
1627                 index = lua_gettop(L) + 1 + index;
1628
1629         if (!lua_istable(L, index))
1630                 return false;
1631
1632         getfloatfield(L, index, "offset",      np->offset);
1633         getfloatfield(L, index, "scale",       np->scale);
1634         getfloatfield(L, index, "persist",     np->persist);
1635         getfloatfield(L, index, "persistence", np->persist);
1636         getfloatfield(L, index, "lacunarity",  np->lacunarity);
1637         getintfield(L,   index, "seed",        np->seed);
1638         getintfield(L,   index, "octaves",     np->octaves);
1639
1640         u32 flags    = 0;
1641         u32 flagmask = 0;
1642         np->flags = getflagsfield(L, index, "flags", flagdesc_noiseparams,
1643                 &flags, &flagmask) ? flags : NOISE_FLAG_DEFAULTS;
1644
1645         lua_getfield(L, index, "spread");
1646         np->spread  = read_v3f(L, -1);
1647         lua_pop(L, 1);
1648
1649         return true;
1650 }
1651
1652 void push_noiseparams(lua_State *L, NoiseParams *np)
1653 {
1654         lua_newtable(L);
1655         push_float_string(L, np->offset);
1656         lua_setfield(L, -2, "offset");
1657         push_float_string(L, np->scale);
1658         lua_setfield(L, -2, "scale");
1659         push_float_string(L, np->persist);
1660         lua_setfield(L, -2, "persistence");
1661         push_float_string(L, np->lacunarity);
1662         lua_setfield(L, -2, "lacunarity");
1663         lua_pushnumber(L, np->seed);
1664         lua_setfield(L, -2, "seed");
1665         lua_pushnumber(L, np->octaves);
1666         lua_setfield(L, -2, "octaves");
1667
1668         push_flags_string(L, flagdesc_noiseparams, np->flags,
1669                 np->flags);
1670         lua_setfield(L, -2, "flags");
1671
1672         push_v3_float_string(L, np->spread);
1673         lua_setfield(L, -2, "spread");
1674 }
1675
1676 /******************************************************************************/
1677 // Returns depth of json value tree
1678 static int push_json_value_getdepth(const Json::Value &value)
1679 {
1680         if (!value.isArray() && !value.isObject())
1681                 return 1;
1682
1683         int maxdepth = 0;
1684         for (const auto &it : value) {
1685                 int elemdepth = push_json_value_getdepth(it);
1686                 if (elemdepth > maxdepth)
1687                         maxdepth = elemdepth;
1688         }
1689         return maxdepth + 1;
1690 }
1691 // Recursive function to convert JSON --> Lua table
1692 static bool push_json_value_helper(lua_State *L, const Json::Value &value,
1693                 int nullindex)
1694 {
1695         switch(value.type()) {
1696                 case Json::nullValue:
1697                 default:
1698                         lua_pushvalue(L, nullindex);
1699                         break;
1700                 case Json::intValue:
1701                         lua_pushinteger(L, value.asLargestInt());
1702                         break;
1703                 case Json::uintValue:
1704                         lua_pushinteger(L, value.asLargestUInt());
1705                         break;
1706                 case Json::realValue:
1707                         lua_pushnumber(L, value.asDouble());
1708                         break;
1709                 case Json::stringValue:
1710                         {
1711                                 const char *str = value.asCString();
1712                                 lua_pushstring(L, str ? str : "");
1713                         }
1714                         break;
1715                 case Json::booleanValue:
1716                         lua_pushboolean(L, value.asInt());
1717                         break;
1718                 case Json::arrayValue:
1719                         lua_createtable(L, value.size(), 0);
1720                         for (Json::Value::const_iterator it = value.begin();
1721                                         it != value.end(); ++it) {
1722                                 push_json_value_helper(L, *it, nullindex);
1723                                 lua_rawseti(L, -2, it.index() + 1);
1724                         }
1725                         break;
1726                 case Json::objectValue:
1727                         lua_createtable(L, 0, value.size());
1728                         for (Json::Value::const_iterator it = value.begin();
1729                                         it != value.end(); ++it) {
1730 #if !defined(JSONCPP_STRING) && (JSONCPP_VERSION_MAJOR < 1 || JSONCPP_VERSION_MINOR < 9)
1731                                 const char *str = it.memberName();
1732                                 lua_pushstring(L, str ? str : "");
1733 #else
1734                                 std::string str = it.name();
1735                                 lua_pushstring(L, str.c_str());
1736 #endif
1737                                 push_json_value_helper(L, *it, nullindex);
1738                                 lua_rawset(L, -3);
1739                         }
1740                         break;
1741         }
1742         return true;
1743 }
1744 // converts JSON --> Lua table; returns false if lua stack limit exceeded
1745 // nullindex: Lua stack index of value to use in place of JSON null
1746 bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
1747 {
1748         if(nullindex < 0)
1749                 nullindex = lua_gettop(L) + 1 + nullindex;
1750
1751         int depth = push_json_value_getdepth(value);
1752
1753         // The maximum number of Lua stack slots used at each recursion level
1754         // of push_json_value_helper is 2, so make sure there a depth * 2 slots
1755         if (lua_checkstack(L, depth * 2))
1756                 return push_json_value_helper(L, value, nullindex);
1757
1758         return false;
1759 }
1760
1761 // Converts Lua table --> JSON
1762 void read_json_value(lua_State *L, Json::Value &root, int index, u8 recursion)
1763 {
1764         if (recursion > 16) {
1765                 throw SerializationError("Maximum recursion depth exceeded");
1766         }
1767         int type = lua_type(L, index);
1768         if (type == LUA_TBOOLEAN) {
1769                 root = (bool) lua_toboolean(L, index);
1770         } else if (type == LUA_TNUMBER) {
1771                 root = lua_tonumber(L, index);
1772         } else if (type == LUA_TSTRING) {
1773                 size_t len;
1774                 const char *str = lua_tolstring(L, index, &len);
1775                 root = std::string(str, len);
1776         } else if (type == LUA_TTABLE) {
1777                 lua_pushnil(L);
1778                 while (lua_next(L, index)) {
1779                         // Key is at -2 and value is at -1
1780                         Json::Value value;
1781                         read_json_value(L, value, lua_gettop(L), recursion + 1);
1782
1783                         Json::ValueType roottype = root.type();
1784                         int keytype = lua_type(L, -1);
1785                         if (keytype == LUA_TNUMBER) {
1786                                 lua_Number key = lua_tonumber(L, -1);
1787                                 if (roottype != Json::nullValue && roottype != Json::arrayValue) {
1788                                         throw SerializationError("Can't mix array and object values in JSON");
1789                                 } else if (key < 1) {
1790                                         throw SerializationError("Can't use zero-based or negative indexes in JSON");
1791                                 } else if (floor(key) != key) {
1792                                         throw SerializationError("Can't use indexes with a fractional part in JSON");
1793                                 }
1794                                 root[(Json::ArrayIndex) key - 1] = value;
1795                         } else if (keytype == LUA_TSTRING) {
1796                                 if (roottype != Json::nullValue && roottype != Json::objectValue) {
1797                                         throw SerializationError("Can't mix array and object values in JSON");
1798                                 }
1799                                 root[lua_tostring(L, -1)] = value;
1800                         } else {
1801                                 throw SerializationError("Lua key to convert to JSON is not a string or number");
1802                         }
1803                 }
1804         } else if (type == LUA_TNIL) {
1805                 root = Json::nullValue;
1806         } else {
1807                 throw SerializationError("Can only store booleans, numbers, strings, objects, arrays, and null in JSON");
1808         }
1809         lua_pop(L, 1); // Pop value
1810 }
1811
1812 void push_pointed_thing(lua_State *L, const PointedThing &pointed, bool csm,
1813         bool hitpoint)
1814 {
1815         lua_newtable(L);
1816         if (pointed.type == POINTEDTHING_NODE) {
1817                 lua_pushstring(L, "node");
1818                 lua_setfield(L, -2, "type");
1819                 push_v3s16(L, pointed.node_undersurface);
1820                 lua_setfield(L, -2, "under");
1821                 push_v3s16(L, pointed.node_abovesurface);
1822                 lua_setfield(L, -2, "above");
1823         } else if (pointed.type == POINTEDTHING_OBJECT) {
1824                 lua_pushstring(L, "object");
1825                 lua_setfield(L, -2, "type");
1826
1827                 if (csm) {
1828                         lua_pushinteger(L, pointed.object_id);
1829                         lua_setfield(L, -2, "id");
1830                 } else {
1831                         push_objectRef(L, pointed.object_id);
1832                         lua_setfield(L, -2, "ref");
1833                 }
1834         } else {
1835                 lua_pushstring(L, "nothing");
1836                 lua_setfield(L, -2, "type");
1837         }
1838         if (hitpoint && (pointed.type != POINTEDTHING_NOTHING)) {
1839                 push_v3f(L, pointed.intersection_point / BS); // convert to node coords
1840                 lua_setfield(L, -2, "intersection_point");
1841                 push_v3s16(L, pointed.intersection_normal);
1842                 lua_setfield(L, -2, "intersection_normal");
1843                 lua_pushinteger(L, pointed.box_id + 1); // change to Lua array index
1844                 lua_setfield(L, -2, "box_id");
1845         }
1846 }
1847
1848 void push_objectRef(lua_State *L, const u16 id)
1849 {
1850         // Get core.object_refs[i]
1851         lua_getglobal(L, "core");
1852         lua_getfield(L, -1, "object_refs");
1853         luaL_checktype(L, -1, LUA_TTABLE);
1854         lua_pushinteger(L, id);
1855         lua_gettable(L, -2);
1856         lua_remove(L, -2); // object_refs
1857         lua_remove(L, -2); // core
1858 }
1859
1860 void read_hud_element(lua_State *L, HudElement *elem)
1861 {
1862         elem->type = (HudElementType)getenumfield(L, 2, "hud_elem_type",
1863                                                                         es_HudElementType, HUD_ELEM_TEXT);
1864
1865         lua_getfield(L, 2, "position");
1866         elem->pos = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1867         lua_pop(L, 1);
1868
1869         lua_getfield(L, 2, "scale");
1870         elem->scale = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1871         lua_pop(L, 1);
1872
1873         lua_getfield(L, 2, "size");
1874         elem->size = lua_istable(L, -1) ? read_v2s32(L, -1) : v2s32();
1875         lua_pop(L, 1);
1876
1877         elem->name    = getstringfield_default(L, 2, "name", "");
1878         elem->text    = getstringfield_default(L, 2, "text", "");
1879         elem->number  = getintfield_default(L, 2, "number", 0);
1880         if (elem->type == HUD_ELEM_WAYPOINT)
1881                 // waypoints reuse the item field to store precision, item = precision + 1
1882                 elem->item = getintfield_default(L, 2, "precision", -1) + 1;
1883         else
1884                 elem->item = getintfield_default(L, 2, "item", 0);
1885         elem->dir     = getintfield_default(L, 2, "direction", 0);
1886         elem->z_index = MYMAX(S16_MIN, MYMIN(S16_MAX,
1887                         getintfield_default(L, 2, "z_index", 0)));
1888         elem->text2   = getstringfield_default(L, 2, "text2", "");
1889
1890         // Deprecated, only for compatibility's sake
1891         if (elem->dir == 0)
1892                 elem->dir = getintfield_default(L, 2, "dir", 0);
1893
1894         lua_getfield(L, 2, "alignment");
1895         elem->align = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1896         lua_pop(L, 1);
1897
1898         lua_getfield(L, 2, "offset");
1899         elem->offset = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1900         lua_pop(L, 1);
1901
1902         lua_getfield(L, 2, "world_pos");
1903         elem->world_pos = lua_istable(L, -1) ? read_v3f(L, -1) : v3f();
1904         lua_pop(L, 1);
1905
1906         /* check for known deprecated element usage */
1907         if ((elem->type  == HUD_ELEM_STATBAR) && (elem->size == v2s32()))
1908                 log_deprecated(L,"Deprecated usage of statbar without size!");
1909 }
1910
1911 void push_hud_element(lua_State *L, HudElement *elem)
1912 {
1913         lua_newtable(L);
1914
1915         lua_pushstring(L, es_HudElementType[(u8)elem->type].str);
1916         lua_setfield(L, -2, "type");
1917
1918         push_v2f(L, elem->pos);
1919         lua_setfield(L, -2, "position");
1920
1921         lua_pushstring(L, elem->name.c_str());
1922         lua_setfield(L, -2, "name");
1923
1924         push_v2f(L, elem->scale);
1925         lua_setfield(L, -2, "scale");
1926
1927         lua_pushstring(L, elem->text.c_str());
1928         lua_setfield(L, -2, "text");
1929
1930         lua_pushnumber(L, elem->number);
1931         lua_setfield(L, -2, "number");
1932
1933         lua_pushnumber(L, elem->item);
1934         lua_setfield(L, -2, "item");
1935
1936         lua_pushnumber(L, elem->dir);
1937         lua_setfield(L, -2, "direction");
1938
1939         push_v2f(L, elem->offset);
1940         lua_setfield(L, -2, "offset");
1941
1942         push_v2f(L, elem->align);
1943         lua_setfield(L, -2, "alignment");
1944
1945         push_v2s32(L, elem->size);
1946         lua_setfield(L, -2, "size");
1947
1948         // Deprecated, only for compatibility's sake
1949         lua_pushnumber(L, elem->dir);
1950         lua_setfield(L, -2, "dir");
1951
1952         push_v3f(L, elem->world_pos);
1953         lua_setfield(L, -2, "world_pos");
1954
1955         lua_pushnumber(L, elem->z_index);
1956         lua_setfield(L, -2, "z_index");
1957
1958         lua_pushstring(L, elem->text2.c_str());
1959         lua_setfield(L, -2, "text2");
1960 }
1961
1962 HudElementStat read_hud_change(lua_State *L, HudElement *elem, void **value)
1963 {
1964         HudElementStat stat = HUD_STAT_NUMBER;
1965         std::string statstr;
1966         if (lua_isstring(L, 3)) {
1967                 int statint;
1968                 statstr = lua_tostring(L, 3);
1969                 stat = string_to_enum(es_HudElementStat, statint, statstr) ?
1970                                 (HudElementStat)statint : stat;
1971         }
1972
1973         switch (stat) {
1974                 case HUD_STAT_POS:
1975                         elem->pos = read_v2f(L, 4);
1976                         *value = &elem->pos;
1977                         break;
1978                 case HUD_STAT_NAME:
1979                         elem->name = luaL_checkstring(L, 4);
1980                         *value = &elem->name;
1981                         break;
1982                 case HUD_STAT_SCALE:
1983                         elem->scale = read_v2f(L, 4);
1984                         *value = &elem->scale;
1985                         break;
1986                 case HUD_STAT_TEXT:
1987                         elem->text = luaL_checkstring(L, 4);
1988                         *value = &elem->text;
1989                         break;
1990                 case HUD_STAT_NUMBER:
1991                         elem->number = luaL_checknumber(L, 4);
1992                         *value = &elem->number;
1993                         break;
1994                 case HUD_STAT_ITEM:
1995                         elem->item = luaL_checknumber(L, 4);
1996                         if (elem->type == HUD_ELEM_WAYPOINT && statstr == "precision")
1997                                 elem->item++;
1998                         *value = &elem->item;
1999                         break;
2000                 case HUD_STAT_DIR:
2001                         elem->dir = luaL_checknumber(L, 4);
2002                         *value = &elem->dir;
2003                         break;
2004                 case HUD_STAT_ALIGN:
2005                         elem->align = read_v2f(L, 4);
2006                         *value = &elem->align;
2007                         break;
2008                 case HUD_STAT_OFFSET:
2009                         elem->offset = read_v2f(L, 4);
2010                         *value = &elem->offset;
2011                         break;
2012                 case HUD_STAT_WORLD_POS:
2013                         elem->world_pos = read_v3f(L, 4);
2014                         *value = &elem->world_pos;
2015                         break;
2016                 case HUD_STAT_SIZE:
2017                         elem->size = read_v2s32(L, 4);
2018                         *value = &elem->size;
2019                         break;
2020                 case HUD_STAT_Z_INDEX:
2021                         elem->z_index = MYMAX(S16_MIN, MYMIN(S16_MAX, luaL_checknumber(L, 4)));
2022                         *value = &elem->z_index;
2023                         break;
2024                 case HUD_STAT_TEXT2:
2025                         elem->text2 = luaL_checkstring(L, 4);
2026                         *value = &elem->text2;
2027                         break;
2028         }
2029         return stat;
2030 }
2031
2032 /******************************************************************************/
2033
2034 // Indices must match values in `enum CollisionType` exactly!!
2035 static const char *collision_type_str[] = {
2036         "node",
2037         "object",
2038 };
2039
2040 // Indices must match values in `enum CollisionAxis` exactly!!
2041 static const char *collision_axis_str[] = {
2042         "x",
2043         "y",
2044         "z",
2045 };
2046
2047 void push_collision_move_result(lua_State *L, const collisionMoveResult &res)
2048 {
2049         lua_createtable(L, 0, 4);
2050
2051         setboolfield(L, -1, "touching_ground", res.touching_ground);
2052         setboolfield(L, -1, "collides", res.collides);
2053         setboolfield(L, -1, "standing_on_object", res.standing_on_object);
2054
2055         /* collisions */
2056         lua_createtable(L, res.collisions.size(), 0);
2057         int i = 1;
2058         for (const auto &c : res.collisions) {
2059                 lua_createtable(L, 0, 5);
2060
2061                 lua_pushstring(L, collision_type_str[c.type]);
2062                 lua_setfield(L, -2, "type");
2063
2064                 assert(c.axis != COLLISION_AXIS_NONE);
2065                 lua_pushstring(L, collision_axis_str[c.axis]);
2066                 lua_setfield(L, -2, "axis");
2067
2068                 if (c.type == COLLISION_NODE) {
2069                         push_v3s16(L, c.node_p);
2070                         lua_setfield(L, -2, "node_pos");
2071                 } else if (c.type == COLLISION_OBJECT) {
2072                         push_objectRef(L, c.object->getId());
2073                         lua_setfield(L, -2, "object");
2074                 }
2075
2076                 push_v3f(L, c.old_speed / BS);
2077                 lua_setfield(L, -2, "old_velocity");
2078
2079                 push_v3f(L, c.new_speed / BS);
2080                 lua_setfield(L, -2, "new_velocity");
2081
2082                 lua_rawseti(L, -2, i++);
2083         }
2084         lua_setfield(L, -2, "collisions");
2085         /**/
2086 }