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 "itemdef.h"
  24 #include "object_properties.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 "serverobject.h"
  33 #include "porting.h"
  34 #include "mg_schematic.h"
  35 #include "noise.h"
  36 #include "json/json.h"
  37
  38 struct EnumString es_TileAnimationType[] =
  39 {
  40         {TAT_NONE, "none"},
  41         {TAT_VERTICAL_FRAMES, "vertical_frames"},
  42         {0, NULL},
  43 };
  44
  45 /******************************************************************************/
  46 ItemDefinition read_item_definition(lua_State* L,int index,
  47                 ItemDefinition default_def)
  48 {
  49         if(index < 0)
  50                 index = lua_gettop(L) + 1 + index;
  51
  52         // Read the item definition
  53         ItemDefinition def = default_def;
  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, "inventory_image", def.inventory_image);
  60         getstringfield(L, index, "wield_image", def.wield_image);
  61
  62         lua_getfield(L, index, "wield_scale");
  63         if(lua_istable(L, -1)){
  64                 def.wield_scale = check_v3f(L, -1);
  65         }
  66         lua_pop(L, 1);
  67
  68         def.stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
  69         if(def.stack_max == 0)
  70                 def.stack_max = 1;
  71
  72         lua_getfield(L, index, "on_use");
  73         def.usable = lua_isfunction(L, -1);
  74         lua_pop(L, 1);
  75
  76         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
  77
  78         warn_if_field_exists(L, index, "tool_digging_properties",
  79                         "Deprecated; use tool_capabilities");
  80
  81         lua_getfield(L, index, "tool_capabilities");
  82         if(lua_istable(L, -1)){
  83                 def.tool_capabilities = new ToolCapabilities(
  84                                 read_tool_capabilities(L, -1));
  85         }
  86
  87         // If name is "" (hand), ensure there are ToolCapabilities
  88         // because it will be looked up there whenever any other item has
  89         // no ToolCapabilities
  90         if(def.name == "" && def.tool_capabilities == NULL){
  91                 def.tool_capabilities = new ToolCapabilities();
  92         }
  93
  94         lua_getfield(L, index, "groups");
  95         read_groups(L, -1, def.groups);
  96         lua_pop(L, 1);
  97
  98         lua_getfield(L, index, "sounds");
  99         if(lua_istable(L, -1)){
 100                 lua_getfield(L, -1, "place");
 101                 read_soundspec(L, -1, def.sound_place);
 102                 lua_pop(L, 1);
 103                 lua_getfield(L, -1, "place_failed");
 104                 read_soundspec(L, -1, def.sound_place_failed);
 105                 lua_pop(L, 1);
 106         }
 107         lua_pop(L, 1);
 108
 109         def.range = getfloatfield_default(L, index, "range", def.range);
 110
 111         // Client shall immediately place this node when player places the item.
 112         // Server will update the precise end result a moment later.
 113         // "" = no prediction
 114         getstringfield(L, index, "node_placement_prediction",
 115                         def.node_placement_prediction);
 116
 117         return def;
 118 }
 119
 120 /******************************************************************************/
 121 void read_object_properties(lua_State *L, int index,
 122                 ObjectProperties *prop)
 123 {
 124         if(index < 0)
 125                 index = lua_gettop(L) + 1 + index;
 126         if(!lua_istable(L, index))
 127                 return;
 128
 129         prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
 130
 131         getboolfield(L, -1, "physical", prop->physical);
 132         getboolfield(L, -1, "collide_with_objects", prop->collideWithObjects);
 133
 134         getfloatfield(L, -1, "weight", prop->weight);
 135
 136         lua_getfield(L, -1, "collisionbox");
 137         if(lua_istable(L, -1))
 138                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
 139         lua_pop(L, 1);
 140
 141         getstringfield(L, -1, "visual", prop->visual);
 142
 143         getstringfield(L, -1, "mesh", prop->mesh);
 144
 145         lua_getfield(L, -1, "visual_size");
 146         if(lua_istable(L, -1))
 147                 prop->visual_size = read_v2f(L, -1);
 148         lua_pop(L, 1);
 149
 150         lua_getfield(L, -1, "textures");
 151         if(lua_istable(L, -1)){
 152                 prop->textures.clear();
 153                 int table = lua_gettop(L);
 154                 lua_pushnil(L);
 155                 while(lua_next(L, table) != 0){
 156                         // key at index -2 and value at index -1
 157                         if(lua_isstring(L, -1))
 158                                 prop->textures.push_back(lua_tostring(L, -1));
 159                         else
 160                                 prop->textures.push_back("");
 161                         // removes value, keeps key for next iteration
 162                         lua_pop(L, 1);
 163                 }
 164         }
 165         lua_pop(L, 1);
 166
 167         lua_getfield(L, -1, "colors");
 168         if (lua_istable(L, -1)) {
 169                 int table = lua_gettop(L);
 170                 prop->colors.clear();
 171                 for (lua_pushnil(L); lua_next(L, table); lua_pop(L, 1)) {
 172                         video::SColor color(255, 255, 255, 255);
 173                         read_color(L, -1, &color);
 174                         prop->colors.push_back(color);
 175                 }
 176         }
 177         lua_pop(L, 1);
 178
 179         lua_getfield(L, -1, "spritediv");
 180         if(lua_istable(L, -1))
 181                 prop->spritediv = read_v2s16(L, -1);
 182         lua_pop(L, 1);
 183
 184         lua_getfield(L, -1, "initial_sprite_basepos");
 185         if(lua_istable(L, -1))
 186                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 187         lua_pop(L, 1);
 188
 189         getboolfield(L, -1, "is_visible", prop->is_visible);
 190         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 191         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 192         if (getfloatfield(L, -1, "stepheight", prop->stepheight))
 193                 prop->stepheight *= BS;
 194         lua_getfield(L, -1, "automatic_face_movement_dir");
 195         if (lua_isnumber(L, -1)) {
 196                 prop->automatic_face_movement_dir = true;
 197                 prop->automatic_face_movement_dir_offset = luaL_checknumber(L, -1);
 198         } else if (lua_isboolean(L, -1)) {
 199                 prop->automatic_face_movement_dir = lua_toboolean(L, -1);
 200                 prop->automatic_face_movement_dir_offset = 0.0;
 201         }
 202         lua_pop(L, 1);
 203         getboolfield(L, -1, "backface_culling", prop->backface_culling);
 204
 205         getstringfield(L, -1, "nametag", prop->nametag);
 206         lua_getfield(L, -1, "nametag_color");
 207         if (!lua_isnil(L, -1)) {
 208                 video::SColor color = prop->nametag_color;
 209                 if (read_color(L, -1, &color))
 210                         prop->nametag_color = color;
 211         }
 212         lua_pop(L, 1);
 213
 214         lua_getfield(L, -1, "automatic_face_movement_max_rotation_per_sec");
 215         if (lua_isnumber(L, -1)) {
 216                 prop->automatic_face_movement_max_rotation_per_sec = luaL_checknumber(L, -1);
 217         }
 218         lua_pop(L, 1);
 219 }
 220
 221 /******************************************************************************/
 222 void push_object_properties(lua_State *L, ObjectProperties *prop)
 223 {
 224         lua_newtable(L);
 225         lua_pushnumber(L, prop->hp_max);
 226         lua_setfield(L, -2, "hp_max");
 227         lua_pushboolean(L, prop->physical);
 228         lua_setfield(L, -2, "physical");
 229         lua_pushboolean(L, prop->collideWithObjects);
 230         lua_setfield(L, -2, "collide_with_objects");
 231         lua_pushnumber(L, prop->weight);
 232         lua_setfield(L, -2, "weight");
 233         push_aabb3f(L, prop->collisionbox);
 234         lua_setfield(L, -2, "collisionbox");
 235         lua_pushlstring(L, prop->visual.c_str(), prop->visual.size());
 236         lua_setfield(L, -2, "visual");
 237         lua_pushlstring(L, prop->mesh.c_str(), prop->mesh.size());
 238         lua_setfield(L, -2, "mesh");
 239         push_v2f(L, prop->visual_size);
 240         lua_setfield(L, -2, "visual_size");
 241
 242         lua_newtable(L);
 243         u16 i = 1;
 244         for (std::vector<std::string>::iterator it = prop->textures.begin();
 245                         it != prop->textures.end(); ++it) {
 246                 lua_pushlstring(L, it->c_str(), it->size());
 247                 lua_rawseti(L, -2, i);
 248         }
 249         lua_setfield(L, -2, "textures");
 250
 251         lua_newtable(L);
 252         i = 1;
 253         for (std::vector<video::SColor>::iterator it = prop->colors.begin();
 254                         it != prop->colors.end(); ++it) {
 255                 push_ARGB8(L, *it);
 256                 lua_rawseti(L, -2, i);
 257         }
 258         lua_setfield(L, -2, "colors");
 259
 260         push_v2s16(L, prop->spritediv);
 261         lua_setfield(L, -2, "spritediv");
 262         push_v2s16(L, prop->initial_sprite_basepos);
 263         lua_setfield(L, -2, "initial_sprite_basepos");
 264         lua_pushboolean(L, prop->is_visible);
 265         lua_setfield(L, -2, "is_visible");
 266         lua_pushboolean(L, prop->makes_footstep_sound);
 267         lua_setfield(L, -2, "makes_footstep_sound");
 268         lua_pushnumber(L, prop->automatic_rotate);
 269         lua_setfield(L, -2, "automatic_rotate");
 270         lua_pushnumber(L, prop->stepheight / BS);
 271         lua_setfield(L, -2, "stepheight");
 272         if (prop->automatic_face_movement_dir)
 273                 lua_pushnumber(L, prop->automatic_face_movement_dir_offset);
 274         else
 275                 lua_pushboolean(L, false);
 276         lua_setfield(L, -2, "automatic_face_movement_dir");
 277         lua_pushboolean(L, prop->backface_culling);
 278         lua_setfield(L, -2, "backface_culling");
 279         lua_pushlstring(L, prop->nametag.c_str(), prop->nametag.size());
 280         lua_setfield(L, -2, "nametag");
 281         push_ARGB8(L, prop->nametag_color);
 282         lua_setfield(L, -2, "nametag_color");
 283         lua_pushnumber(L, prop->automatic_face_movement_max_rotation_per_sec);
 284         lua_setfield(L, -2, "automatic_face_movement_max_rotation_per_sec");
 285 }
 286
 287 /******************************************************************************/
 288 TileDef read_tiledef(lua_State *L, int index, u8 drawtype)
 289 {
 290         if(index < 0)
 291                 index = lua_gettop(L) + 1 + index;
 292
 293         TileDef tiledef;
 294         bool default_tiling = (drawtype == NDT_PLANTLIKE || drawtype == NDT_FIRELIKE)
 295                 ? false : true;
 296         // key at index -2 and value at index
 297         if(lua_isstring(L, index)){
 298                 // "default_lava.png"
 299                 tiledef.name = lua_tostring(L, index);
 300                 tiledef.tileable_vertical = default_tiling;
 301                 tiledef.tileable_horizontal = default_tiling;
 302         }
 303         else if(lua_istable(L, index))
 304         {
 305                 // {name="default_lava.png", animation={}}
 306                 tiledef.name = "";
 307                 getstringfield(L, index, "name", tiledef.name);
 308                 getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
 309                 tiledef.backface_culling = getboolfield_default(
 310                         L, index, "backface_culling", true);
 311                 tiledef.tileable_horizontal = getboolfield_default(
 312                         L, index, "tileable_horizontal", default_tiling);
 313                 tiledef.tileable_vertical = getboolfield_default(
 314                         L, index, "tileable_vertical", default_tiling);
 315                 // animation = {}
 316                 lua_getfield(L, index, "animation");
 317                 if(lua_istable(L, -1)){
 318                         // {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
 319                         tiledef.animation.type = (TileAnimationType)
 320                                 getenumfield(L, -1, "type", es_TileAnimationType,
 321                                 TAT_NONE);
 322                         tiledef.animation.aspect_w =
 323                                 getintfield_default(L, -1, "aspect_w", 16);
 324                         tiledef.animation.aspect_h =
 325                                 getintfield_default(L, -1, "aspect_h", 16);
 326                         tiledef.animation.length =
 327                                 getfloatfield_default(L, -1, "length", 1.0);
 328                 }
 329                 lua_pop(L, 1);
 330         }
 331
 332         return tiledef;
 333 }
 334
 335 /******************************************************************************/
 336 ContentFeatures read_content_features(lua_State *L, int index)
 337 {
 338         if(index < 0)
 339                 index = lua_gettop(L) + 1 + index;
 340
 341         ContentFeatures f;
 342
 343         /* Cache existence of some callbacks */
 344         lua_getfield(L, index, "on_construct");
 345         if(!lua_isnil(L, -1)) f.has_on_construct = true;
 346         lua_pop(L, 1);
 347         lua_getfield(L, index, "on_destruct");
 348         if(!lua_isnil(L, -1)) f.has_on_destruct = true;
 349         lua_pop(L, 1);
 350         lua_getfield(L, index, "after_destruct");
 351         if(!lua_isnil(L, -1)) f.has_after_destruct = true;
 352         lua_pop(L, 1);
 353
 354         lua_getfield(L, index, "on_rightclick");
 355         f.rightclickable = lua_isfunction(L, -1);
 356         lua_pop(L, 1);
 357
 358         /* Name */
 359         getstringfield(L, index, "name", f.name);
 360
 361         /* Groups */
 362         lua_getfield(L, index, "groups");
 363         read_groups(L, -1, f.groups);
 364         lua_pop(L, 1);
 365
 366         /* Visual definition */
 367
 368         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype",
 369                         ScriptApiNode::es_DrawType,NDT_NORMAL);
 370         getfloatfield(L, index, "visual_scale", f.visual_scale);
 371
 372         /* Meshnode model filename */
 373         getstringfield(L, index, "mesh", f.mesh);
 374
 375         // tiles = {}
 376         lua_getfield(L, index, "tiles");
 377         // If nil, try the deprecated name "tile_images" instead
 378         if(lua_isnil(L, -1)){
 379                 lua_pop(L, 1);
 380                 warn_if_field_exists(L, index, "tile_images",
 381                                 "Deprecated; new name is \"tiles\".");
 382                 lua_getfield(L, index, "tile_images");
 383         }
 384         if(lua_istable(L, -1)){
 385                 int table = lua_gettop(L);
 386                 lua_pushnil(L);
 387                 int i = 0;
 388                 while(lua_next(L, table) != 0){
 389                         // Read tiledef from value
 390                         f.tiledef[i] = read_tiledef(L, -1, f.drawtype);
 391                         // removes value, keeps key for next iteration
 392                         lua_pop(L, 1);
 393                         i++;
 394                         if(i==6){
 395                                 lua_pop(L, 1);
 396                                 break;
 397                         }
 398                 }
 399                 // Copy last value to all remaining textures
 400                 if(i >= 1){
 401                         TileDef lasttile = f.tiledef[i-1];
 402                         while(i < 6){
 403                                 f.tiledef[i] = lasttile;
 404                                 i++;
 405                         }
 406                 }
 407         }
 408         lua_pop(L, 1);
 409
 410         // special_tiles = {}
 411         lua_getfield(L, index, "special_tiles");
 412         // If nil, try the deprecated name "special_materials" instead
 413         if(lua_isnil(L, -1)){
 414                 lua_pop(L, 1);
 415                 warn_if_field_exists(L, index, "special_materials",
 416                                 "Deprecated; new name is \"special_tiles\".");
 417                 lua_getfield(L, index, "special_materials");
 418         }
 419         if(lua_istable(L, -1)){
 420                 int table = lua_gettop(L);
 421                 lua_pushnil(L);
 422                 int i = 0;
 423                 while(lua_next(L, table) != 0){
 424                         // Read tiledef from value
 425                         f.tiledef_special[i] = read_tiledef(L, -1, f.drawtype);
 426                         // removes value, keeps key for next iteration
 427                         lua_pop(L, 1);
 428                         i++;
 429                         if(i==CF_SPECIAL_COUNT){
 430                                 lua_pop(L, 1);
 431                                 break;
 432                         }
 433                 }
 434         }
 435         lua_pop(L, 1);
 436
 437         f.alpha = getintfield_default(L, index, "alpha", 255);
 438
 439         bool usealpha = getboolfield_default(L, index,
 440                         "use_texture_alpha", false);
 441         if (usealpha)
 442                 f.alpha = 0;
 443
 444         /* Other stuff */
 445
 446         lua_getfield(L, index, "post_effect_color");
 447         read_color(L, -1, &f.post_effect_color);
 448         lua_pop(L, 1);
 449
 450         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
 451                         ScriptApiNode::es_ContentParamType, CPT_NONE);
 452         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
 453                         ScriptApiNode::es_ContentParamType2, CPT2_NONE);
 454
 455         // Warn about some deprecated fields
 456         warn_if_field_exists(L, index, "wall_mounted",
 457                         "Deprecated; use paramtype2 = 'wallmounted'");
 458         warn_if_field_exists(L, index, "light_propagates",
 459                         "Deprecated; determined from paramtype");
 460         warn_if_field_exists(L, index, "dug_item",
 461                         "Deprecated; use 'drop' field");
 462         warn_if_field_exists(L, index, "extra_dug_item",
 463                         "Deprecated; use 'drop' field");
 464         warn_if_field_exists(L, index, "extra_dug_item_rarity",
 465                         "Deprecated; use 'drop' field");
 466         warn_if_field_exists(L, index, "metadata_name",
 467                         "Deprecated; use on_add and metadata callbacks");
 468
 469         // True for all ground-like things like stone and mud, false for eg. trees
 470         getboolfield(L, index, "is_ground_content", f.is_ground_content);
 471         f.light_propagates = (f.param_type == CPT_LIGHT);
 472         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
 473         // This is used for collision detection.
 474         // Also for general solidness queries.
 475         getboolfield(L, index, "walkable", f.walkable);
 476         // Player can point to these
 477         getboolfield(L, index, "pointable", f.pointable);
 478         // Player can dig these
 479         getboolfield(L, index, "diggable", f.diggable);
 480         // Player can climb these
 481         getboolfield(L, index, "climbable", f.climbable);
 482         // Player can build on these
 483         getboolfield(L, index, "buildable_to", f.buildable_to);
 484         // Whether the node is non-liquid, source liquid or flowing liquid
 485         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
 486                         ScriptApiNode::es_LiquidType, LIQUID_NONE);
 487         // If the content is liquid, this is the flowing version of the liquid.
 488         getstringfield(L, index, "liquid_alternative_flowing",
 489                         f.liquid_alternative_flowing);
 490         // If the content is liquid, this is the source version of the liquid.
 491         getstringfield(L, index, "liquid_alternative_source",
 492                         f.liquid_alternative_source);
 493         // Viscosity for fluid flow, ranging from 1 to 7, with
 494         // 1 giving almost instantaneous propagation and 7 being
 495         // the slowest possible
 496         f.liquid_viscosity = getintfield_default(L, index,
 497                         "liquid_viscosity", f.liquid_viscosity);
 498         f.liquid_range = getintfield_default(L, index,
 499                         "liquid_range", f.liquid_range);
 500         f.leveled = getintfield_default(L, index, "leveled", f.leveled);
 501
 502         getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
 503         f.drowning = getintfield_default(L, index,
 504                         "drowning", f.drowning);
 505         // Amount of light the node emits
 506         f.light_source = getintfield_default(L, index,
 507                         "light_source", f.light_source);
 508         f.damage_per_second = getintfield_default(L, index,
 509                         "damage_per_second", f.damage_per_second);
 510
 511         lua_getfield(L, index, "node_box");
 512         if(lua_istable(L, -1))
 513                 f.node_box = read_nodebox(L, -1);
 514         lua_pop(L, 1);
 515
 516         lua_getfield(L, index, "selection_box");
 517         if(lua_istable(L, -1))
 518                 f.selection_box = read_nodebox(L, -1);
 519         lua_pop(L, 1);
 520
 521         lua_getfield(L, index, "collision_box");
 522         if(lua_istable(L, -1))
 523                 f.collision_box = read_nodebox(L, -1);
 524         lua_pop(L, 1);
 525
 526         f.waving = getintfield_default(L, index,
 527                         "waving", f.waving);
 528
 529         // Set to true if paramtype used to be 'facedir_simple'
 530         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
 531         // Set to true if wall_mounted used to be set to true
 532         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
 533
 534         // Sound table
 535         lua_getfield(L, index, "sounds");
 536         if(lua_istable(L, -1)){
 537                 lua_getfield(L, -1, "footstep");
 538                 read_soundspec(L, -1, f.sound_footstep);
 539                 lua_pop(L, 1);
 540                 lua_getfield(L, -1, "dig");
 541                 read_soundspec(L, -1, f.sound_dig);
 542                 lua_pop(L, 1);
 543                 lua_getfield(L, -1, "dug");
 544                 read_soundspec(L, -1, f.sound_dug);
 545                 lua_pop(L, 1);
 546         }
 547         lua_pop(L, 1);
 548
 549         return f;
 550 }
 551
 552 /******************************************************************************/
 553 void read_server_sound_params(lua_State *L, int index,
 554                 ServerSoundParams &params)
 555 {
 556         if(index < 0)
 557                 index = lua_gettop(L) + 1 + index;
 558         // Clear
 559         params = ServerSoundParams();
 560         if(lua_istable(L, index)){
 561                 getfloatfield(L, index, "gain", params.gain);
 562                 getstringfield(L, index, "to_player", params.to_player);
 563                 lua_getfield(L, index, "pos");
 564                 if(!lua_isnil(L, -1)){
 565                         v3f p = read_v3f(L, -1)*BS;
 566                         params.pos = p;
 567                         params.type = ServerSoundParams::SSP_POSITIONAL;
 568                 }
 569                 lua_pop(L, 1);
 570                 lua_getfield(L, index, "object");
 571                 if(!lua_isnil(L, -1)){
 572                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
 573                         ServerActiveObject *sao = ObjectRef::getobject(ref);
 574                         if(sao){
 575                                 params.object = sao->getId();
 576                                 params.type = ServerSoundParams::SSP_OBJECT;
 577                         }
 578                 }
 579                 lua_pop(L, 1);
 580                 params.max_hear_distance = BS*getfloatfield_default(L, index,
 581                                 "max_hear_distance", params.max_hear_distance/BS);
 582                 getboolfield(L, index, "loop", params.loop);
 583         }
 584 }
 585
 586 /******************************************************************************/
 587 void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
 588 {
 589         if(index < 0)
 590                 index = lua_gettop(L) + 1 + index;
 591         if(lua_isnil(L, index)){
 592         } else if(lua_istable(L, index)){
 593                 getstringfield(L, index, "name", spec.name);
 594                 getfloatfield(L, index, "gain", spec.gain);
 595         } else if(lua_isstring(L, index)){
 596                 spec.name = lua_tostring(L, index);
 597         }
 598 }
 599
 600 /******************************************************************************/
 601 NodeBox read_nodebox(lua_State *L, int index)
 602 {
 603         NodeBox nodebox;
 604         if(lua_istable(L, -1)){
 605                 nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
 606                                 ScriptApiNode::es_NodeBoxType, NODEBOX_REGULAR);
 607
 608                 lua_getfield(L, index, "fixed");
 609                 if(lua_istable(L, -1))
 610                         nodebox.fixed = read_aabb3f_vector(L, -1, BS);
 611                 lua_pop(L, 1);
 612
 613                 lua_getfield(L, index, "wall_top");
 614                 if(lua_istable(L, -1))
 615                         nodebox.wall_top = read_aabb3f(L, -1, BS);
 616                 lua_pop(L, 1);
 617
 618                 lua_getfield(L, index, "wall_bottom");
 619                 if(lua_istable(L, -1))
 620                         nodebox.wall_bottom = read_aabb3f(L, -1, BS);
 621                 lua_pop(L, 1);
 622
 623                 lua_getfield(L, index, "wall_side");
 624                 if(lua_istable(L, -1))
 625                         nodebox.wall_side = read_aabb3f(L, -1, BS);
 626                 lua_pop(L, 1);
 627         }
 628         return nodebox;
 629 }
 630
 631 /******************************************************************************/
 632 MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
 633 {
 634         lua_getfield(L, index, "name");
 635         if (!lua_isstring(L, -1))
 636                 throw LuaError("Node name is not set or is not a string!");
 637         const char *name = lua_tostring(L, -1);
 638         lua_pop(L, 1);
 639
 640         u8 param1 = 0;
 641         lua_getfield(L, index, "param1");
 642         if (!lua_isnil(L, -1))
 643                 param1 = lua_tonumber(L, -1);
 644         lua_pop(L, 1);
 645
 646         u8 param2 = 0;
 647         lua_getfield(L, index, "param2");
 648         if (!lua_isnil(L, -1))
 649                 param2 = lua_tonumber(L, -1);
 650         lua_pop(L, 1);
 651
 652         return MapNode(ndef, name, param1, param2);
 653 }
 654
 655 /******************************************************************************/
 656 void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
 657 {
 658         lua_newtable(L);
 659         lua_pushstring(L, ndef->get(n).name.c_str());
 660         lua_setfield(L, -2, "name");
 661         lua_pushnumber(L, n.getParam1());
 662         lua_setfield(L, -2, "param1");
 663         lua_pushnumber(L, n.getParam2());
 664         lua_setfield(L, -2, "param2");
 665 }
 666
 667 /******************************************************************************/
 668 void warn_if_field_exists(lua_State *L, int table,
 669                 const char *name, const std::string &message)
 670 {
 671         lua_getfield(L, table, name);
 672         if (!lua_isnil(L, -1)) {
 673                 warningstream << "Field \"" << name << "\": "
 674                                 << message << std::endl;
 675                 infostream << script_get_backtrace(L) << std::endl;
 676         }
 677         lua_pop(L, 1);
 678 }
 679
 680 /******************************************************************************/
 681 int getenumfield(lua_State *L, int table,
 682                 const char *fieldname, const EnumString *spec, int default_)
 683 {
 684         int result = default_;
 685         string_to_enum(spec, result,
 686                         getstringfield_default(L, table, fieldname, ""));
 687         return result;
 688 }
 689
 690 /******************************************************************************/
 691 bool string_to_enum(const EnumString *spec, int &result,
 692                 const std::string &str)
 693 {
 694         const EnumString *esp = spec;
 695         while(esp->str){
 696                 if(str == std::string(esp->str)){
 697                         result = esp->num;
 698                         return true;
 699                 }
 700                 esp++;
 701         }
 702         return false;
 703 }
 704
 705 /******************************************************************************/
 706 ItemStack read_item(lua_State* L, int index,Server* srv)
 707 {
 708         if(index < 0)
 709                 index = lua_gettop(L) + 1 + index;
 710
 711         if(lua_isnil(L, index))
 712         {
 713                 return ItemStack();
 714         }
 715         else if(lua_isuserdata(L, index))
 716         {
 717                 // Convert from LuaItemStack
 718                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
 719                 return o->getItem();
 720         }
 721         else if(lua_isstring(L, index))
 722         {
 723                 // Convert from itemstring
 724                 std::string itemstring = lua_tostring(L, index);
 725                 IItemDefManager *idef = srv->idef();
 726                 try
 727                 {
 728                         ItemStack item;
 729                         item.deSerialize(itemstring, idef);
 730                         return item;
 731                 }
 732                 catch(SerializationError &e)
 733                 {
 734                         warningstream<<"unable to create item from itemstring"
 735                                         <<": "<<itemstring<<std::endl;
 736                         return ItemStack();
 737                 }
 738         }
 739         else if(lua_istable(L, index))
 740         {
 741                 // Convert from table
 742                 IItemDefManager *idef = srv->idef();
 743                 std::string name = getstringfield_default(L, index, "name", "");
 744                 int count = getintfield_default(L, index, "count", 1);
 745                 int wear = getintfield_default(L, index, "wear", 0);
 746                 std::string metadata = getstringfield_default(L, index, "metadata", "");
 747                 return ItemStack(name, count, wear, metadata, idef);
 748         }
 749         else
 750         {
 751                 throw LuaError("Expecting itemstack, itemstring, table or nil");
 752         }
 753 }
 754
 755 /******************************************************************************/
 756 void push_tool_capabilities(lua_State *L,
 757                 const ToolCapabilities &toolcap)
 758 {
 759         lua_newtable(L);
 760         setfloatfield(L, -1, "full_punch_interval", toolcap.full_punch_interval);
 761                 setintfield(L, -1, "max_drop_level", toolcap.max_drop_level);
 762                 // Create groupcaps table
 763                 lua_newtable(L);
 764                 // For each groupcap
 765                 for(std::map<std::string, ToolGroupCap>::const_iterator
 766                                 i = toolcap.groupcaps.begin(); i != toolcap.groupcaps.end(); i++){
 767                         // Create groupcap table
 768                         lua_newtable(L);
 769                         const std::string &name = i->first;
 770                         const ToolGroupCap &groupcap = i->second;
 771                         // Create subtable "times"
 772                         lua_newtable(L);
 773                         for(std::map<int, float>::const_iterator
 774                                         i = groupcap.times.begin(); i != groupcap.times.end(); i++){
 775                                 int rating = i->first;
 776                                 float time = i->second;
 777                                 lua_pushinteger(L, rating);
 778                                 lua_pushnumber(L, time);
 779                                 lua_settable(L, -3);
 780                         }
 781                         // Set subtable "times"
 782                         lua_setfield(L, -2, "times");
 783                         // Set simple parameters
 784                         setintfield(L, -1, "maxlevel", groupcap.maxlevel);
 785                         setintfield(L, -1, "uses", groupcap.uses);
 786                         // Insert groupcap table into groupcaps table
 787                         lua_setfield(L, -2, name.c_str());
 788                 }
 789                 // Set groupcaps table
 790                 lua_setfield(L, -2, "groupcaps");
 791                 //Create damage_groups table
 792                 lua_newtable(L);
 793                 // For each damage group
 794                 for(std::map<std::string, s16>::const_iterator
 795                                 i = toolcap.damageGroups.begin(); i != toolcap.damageGroups.end(); i++){
 796                         // Create damage group table
 797                         lua_pushinteger(L, i->second);
 798                         lua_setfield(L, -2, i->first.c_str());
 799                 }
 800                 lua_setfield(L, -2, "damage_groups");
 801 }
 802
 803 /******************************************************************************/
 804 void push_inventory_list(lua_State *L, Inventory *inv, const char *name)
 805 {
 806         InventoryList *invlist = inv->getList(name);
 807         if(invlist == NULL){
 808                 lua_pushnil(L);
 809                 return;
 810         }
 811         std::vector<ItemStack> items;
 812         for(u32 i=0; i<invlist->getSize(); i++)
 813                 items.push_back(invlist->getItem(i));
 814         push_items(L, items);
 815 }
 816
 817 /******************************************************************************/
 818 void read_inventory_list(lua_State *L, int tableindex,
 819                 Inventory *inv, const char *name, Server* srv, int forcesize)
 820 {
 821         if(tableindex < 0)
 822                 tableindex = lua_gettop(L) + 1 + tableindex;
 823         // If nil, delete list
 824         if(lua_isnil(L, tableindex)){
 825                 inv->deleteList(name);
 826                 return;
 827         }
 828         // Otherwise set list
 829         std::vector<ItemStack> items = read_items(L, tableindex,srv);
 830         int listsize = (forcesize != -1) ? forcesize : items.size();
 831         InventoryList *invlist = inv->addList(name, listsize);
 832         int index = 0;
 833         for(std::vector<ItemStack>::const_iterator
 834                         i = items.begin(); i != items.end(); i++){
 835                 if(forcesize != -1 && index == forcesize)
 836                         break;
 837                 invlist->changeItem(index, *i);
 838                 index++;
 839         }
 840         while(forcesize != -1 && index < forcesize){
 841                 invlist->deleteItem(index);
 842                 index++;
 843         }
 844 }
 845
 846 /******************************************************************************/
 847 ToolCapabilities read_tool_capabilities(
 848                 lua_State *L, int table)
 849 {
 850         ToolCapabilities toolcap;
 851         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
 852         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
 853         lua_getfield(L, table, "groupcaps");
 854         if(lua_istable(L, -1)){
 855                 int table_groupcaps = lua_gettop(L);
 856                 lua_pushnil(L);
 857                 while(lua_next(L, table_groupcaps) != 0){
 858                         // key at index -2 and value at index -1
 859                         std::string groupname = luaL_checkstring(L, -2);
 860                         if(lua_istable(L, -1)){
 861                                 int table_groupcap = lua_gettop(L);
 862                                 // This will be created
 863                                 ToolGroupCap groupcap;
 864                                 // Read simple parameters
 865                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
 866                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
 867                                 // DEPRECATED: maxwear
 868                                 float maxwear = 0;
 869                                 if (getfloatfield(L, table_groupcap, "maxwear", maxwear)){
 870                                         if (maxwear != 0)
 871                                                 groupcap.uses = 1.0/maxwear;
 872                                         else
 873                                                 groupcap.uses = 0;
 874                                         warningstream << "Field \"maxwear\" is deprecated; "
 875                                                         << "replace with uses=1/maxwear" << std::endl;
 876                                         infostream << script_get_backtrace(L) << std::endl;
 877                                 }
 878                                 // Read "times" table
 879                                 lua_getfield(L, table_groupcap, "times");
 880                                 if(lua_istable(L, -1)){
 881                                         int table_times = lua_gettop(L);
 882                                         lua_pushnil(L);
 883                                         while(lua_next(L, table_times) != 0){
 884                                                 // key at index -2 and value at index -1
 885                                                 int rating = luaL_checkinteger(L, -2);
 886                                                 float time = luaL_checknumber(L, -1);
 887                                                 groupcap.times[rating] = time;
 888                                                 // removes value, keeps key for next iteration
 889                                                 lua_pop(L, 1);
 890                                         }
 891                                 }
 892                                 lua_pop(L, 1);
 893                                 // Insert groupcap into toolcap
 894                                 toolcap.groupcaps[groupname] = groupcap;
 895                         }
 896                         // removes value, keeps key for next iteration
 897                         lua_pop(L, 1);
 898                 }
 899         }
 900         lua_pop(L, 1);
 901
 902         lua_getfield(L, table, "damage_groups");
 903         if(lua_istable(L, -1)){
 904                 int table_damage_groups = lua_gettop(L);
 905                 lua_pushnil(L);
 906                 while(lua_next(L, table_damage_groups) != 0){
 907                         // key at index -2 and value at index -1
 908                         std::string groupname = luaL_checkstring(L, -2);
 909                         u16 value = luaL_checkinteger(L, -1);
 910                         toolcap.damageGroups[groupname] = value;
 911                         // removes value, keeps key for next iteration
 912                         lua_pop(L, 1);
 913                 }
 914         }
 915         lua_pop(L, 1);
 916         return toolcap;
 917 }
 918
 919 /******************************************************************************/
 920 void push_dig_params(lua_State *L,const DigParams &params)
 921 {
 922         lua_newtable(L);
 923         setboolfield(L, -1, "diggable", params.diggable);
 924         setfloatfield(L, -1, "time", params.time);
 925         setintfield(L, -1, "wear", params.wear);
 926 }
 927
 928 /******************************************************************************/
 929 void push_hit_params(lua_State *L,const HitParams &params)
 930 {
 931         lua_newtable(L);
 932         setintfield(L, -1, "hp", params.hp);
 933         setintfield(L, -1, "wear", params.wear);
 934 }
 935
 936 /******************************************************************************/
 937
 938 bool getflagsfield(lua_State *L, int table, const char *fieldname,
 939         FlagDesc *flagdesc, u32 *flags, u32 *flagmask)
 940 {
 941         lua_getfield(L, table, fieldname);
 942
 943         bool success = read_flags(L, -1, flagdesc, flags, flagmask);
 944
 945         lua_pop(L, 1);
 946
 947         return success;
 948 }
 949
 950 bool read_flags(lua_State *L, int index, FlagDesc *flagdesc,
 951         u32 *flags, u32 *flagmask)
 952 {
 953         if (lua_isstring(L, index)) {
 954                 std::string flagstr = lua_tostring(L, index);
 955                 *flags = readFlagString(flagstr, flagdesc, flagmask);
 956         } else if (lua_istable(L, index)) {
 957                 *flags = read_flags_table(L, index, flagdesc, flagmask);
 958         } else {
 959                 return false;
 960         }
 961
 962         return true;
 963 }
 964
 965 u32 read_flags_table(lua_State *L, int table, FlagDesc *flagdesc, u32 *flagmask)
 966 {
 967         u32 flags = 0, mask = 0;
 968         char fnamebuf[64] = "no";
 969
 970         for (int i = 0; flagdesc[i].name; i++) {
 971                 bool result;
 972
 973                 if (getboolfield(L, table, flagdesc[i].name, result)) {
 974                         mask |= flagdesc[i].flag;
 975                         if (result)
 976                                 flags |= flagdesc[i].flag;
 977                 }
 978
 979                 strlcpy(fnamebuf + 2, flagdesc[i].name, sizeof(fnamebuf) - 2);
 980                 if (getboolfield(L, table, fnamebuf, result))
 981                         mask |= flagdesc[i].flag;
 982         }
 983
 984         if (flagmask)
 985                 *flagmask = mask;
 986
 987         return flags;
 988 }
 989
 990 void push_flags_string(lua_State *L, FlagDesc *flagdesc, u32 flags, u32 flagmask)
 991 {
 992         std::string flagstring = writeFlagString(flags, flagdesc, flagmask);
 993         lua_pushlstring(L, flagstring.c_str(), flagstring.size());
 994 }
 995
 996 /******************************************************************************/
 997 /* Lua Stored data!                                                           */
 998 /******************************************************************************/
 999
1000 /******************************************************************************/
1001 void read_groups(lua_State *L, int index,
1002                 std::map<std::string, int> &result)
1003 {
1004         if (!lua_istable(L,index))
1005                 return;
1006         result.clear();
1007         lua_pushnil(L);
1008         if(index < 0)
1009                 index -= 1;
1010         while(lua_next(L, index) != 0){
1011                 // key at index -2 and value at index -1
1012                 std::string name = luaL_checkstring(L, -2);
1013                 int rating = luaL_checkinteger(L, -1);
1014                 result[name] = rating;
1015                 // removes value, keeps key for next iteration
1016                 lua_pop(L, 1);
1017         }
1018 }
1019
1020 /******************************************************************************/
1021 void push_groups(lua_State *L, const std::map<std::string, int> &groups)
1022 {
1023         lua_newtable(L);
1024         std::map<std::string, int>::const_iterator it;
1025         for (it = groups.begin(); it != groups.end(); ++it) {
1026                 lua_pushnumber(L, it->second);
1027                 lua_setfield(L, -2, it->first.c_str());
1028         }
1029 }
1030
1031 /******************************************************************************/
1032 void push_items(lua_State *L, const std::vector<ItemStack> &items)
1033 {
1034         lua_createtable(L, items.size(), 0);
1035         for (u32 i = 0; i != items.size(); i++) {
1036                 LuaItemStack::create(L, items[i]);
1037                 lua_rawseti(L, -2, i + 1);
1038         }
1039 }
1040
1041 /******************************************************************************/
1042 std::vector<ItemStack> read_items(lua_State *L, int index, Server *srv)
1043 {
1044         if(index < 0)
1045                 index = lua_gettop(L) + 1 + index;
1046
1047         std::vector<ItemStack> items;
1048         luaL_checktype(L, index, LUA_TTABLE);
1049         lua_pushnil(L);
1050         while (lua_next(L, index)) {
1051                 s32 key = luaL_checkinteger(L, -2);
1052                 if (key < 1) {
1053                         throw LuaError("Invalid inventory list index");
1054                 }
1055                 if (items.size() < (u32) key) {
1056                         items.resize(key);
1057                 }
1058                 items[key - 1] = read_item(L, -1, srv);
1059                 lua_pop(L, 1);
1060         }
1061         return items;
1062 }
1063
1064 /******************************************************************************/
1065 void luaentity_get(lua_State *L, u16 id)
1066 {
1067         // Get luaentities[i]
1068         lua_getglobal(L, "core");
1069         lua_getfield(L, -1, "luaentities");
1070         luaL_checktype(L, -1, LUA_TTABLE);
1071         lua_pushnumber(L, id);
1072         lua_gettable(L, -2);
1073         lua_remove(L, -2); // Remove luaentities
1074         lua_remove(L, -2); // Remove core
1075 }
1076
1077 /******************************************************************************/
1078 bool read_noiseparams(lua_State *L, int index, NoiseParams *np)
1079 {
1080         if (index < 0)
1081                 index = lua_gettop(L) + 1 + index;
1082
1083         if (!lua_istable(L, index))
1084                 return false;
1085
1086         getfloatfield(L, index, "offset",      np->offset);
1087         getfloatfield(L, index, "scale",       np->scale);
1088         getfloatfield(L, index, "persist",     np->persist);
1089         getfloatfield(L, index, "persistence", np->persist);
1090         getfloatfield(L, index, "lacunarity",  np->lacunarity);
1091         getintfield(L,   index, "seed",        np->seed);
1092         getintfield(L,   index, "octaves",     np->octaves);
1093
1094         u32 flags    = 0;
1095         u32 flagmask = 0;
1096         np->flags = getflagsfield(L, index, "flags", flagdesc_noiseparams,
1097                 &flags, &flagmask) ? flags : NOISE_FLAG_DEFAULTS;
1098
1099         lua_getfield(L, index, "spread");
1100         np->spread  = read_v3f(L, -1);
1101         lua_pop(L, 1);
1102
1103         return true;
1104 }
1105
1106 void push_noiseparams(lua_State *L, NoiseParams *np)
1107 {
1108         lua_newtable(L);
1109         lua_pushnumber(L, np->offset);
1110         lua_setfield(L, -2, "offset");
1111         lua_pushnumber(L, np->scale);
1112         lua_setfield(L, -2, "scale");
1113         lua_pushnumber(L, np->persist);
1114         lua_setfield(L, -2, "persistence");
1115         lua_pushnumber(L, np->lacunarity);
1116         lua_setfield(L, -2, "lacunarity");
1117         lua_pushnumber(L, np->seed);
1118         lua_setfield(L, -2, "seed");
1119         lua_pushnumber(L, np->octaves);
1120         lua_setfield(L, -2, "octaves");
1121
1122         push_flags_string(L, flagdesc_noiseparams, np->flags,
1123                 np->flags);
1124         lua_setfield(L, -2, "flags");
1125
1126         push_v3f(L, np->spread);
1127         lua_setfield(L, -2, "spread");
1128 }
1129
1130 /******************************************************************************/
1131 // Returns depth of json value tree
1132 static int push_json_value_getdepth(const Json::Value &value)
1133 {
1134         if (!value.isArray() && !value.isObject())
1135                 return 1;
1136
1137         int maxdepth = 0;
1138         for (Json::Value::const_iterator it = value.begin();
1139                         it != value.end(); ++it) {
1140                 int elemdepth = push_json_value_getdepth(*it);
1141                 if (elemdepth > maxdepth)
1142                         maxdepth = elemdepth;
1143         }
1144         return maxdepth + 1;
1145 }
1146 // Recursive function to convert JSON --> Lua table
1147 static bool push_json_value_helper(lua_State *L, const Json::Value &value,
1148                 int nullindex)
1149 {
1150         switch(value.type()) {
1151                 case Json::nullValue:
1152                 default:
1153                         lua_pushvalue(L, nullindex);
1154                         break;
1155                 case Json::intValue:
1156                         lua_pushinteger(L, value.asInt());
1157                         break;
1158                 case Json::uintValue:
1159                         lua_pushinteger(L, value.asUInt());
1160                         break;
1161                 case Json::realValue:
1162                         lua_pushnumber(L, value.asDouble());
1163                         break;
1164                 case Json::stringValue:
1165                         {
1166                                 const char *str = value.asCString();
1167                                 lua_pushstring(L, str ? str : "");
1168                         }
1169                         break;
1170                 case Json::booleanValue:
1171                         lua_pushboolean(L, value.asInt());
1172                         break;
1173                 case Json::arrayValue:
1174                         lua_newtable(L);
1175                         for (Json::Value::const_iterator it = value.begin();
1176                                         it != value.end(); ++it) {
1177                                 push_json_value_helper(L, *it, nullindex);
1178                                 lua_rawseti(L, -2, it.index() + 1);
1179                         }
1180                         break;
1181                 case Json::objectValue:
1182                         lua_newtable(L);
1183                         for (Json::Value::const_iterator it = value.begin();
1184                                         it != value.end(); ++it) {
1185                                 const char *str = it.memberName();
1186                                 lua_pushstring(L, str ? str : "");
1187                                 push_json_value_helper(L, *it, nullindex);
1188                                 lua_rawset(L, -3);
1189                         }
1190                         break;
1191         }
1192         return true;
1193 }
1194 // converts JSON --> Lua table; returns false if lua stack limit exceeded
1195 // nullindex: Lua stack index of value to use in place of JSON null
1196 bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
1197 {
1198         if(nullindex < 0)
1199                 nullindex = lua_gettop(L) + 1 + nullindex;
1200
1201         int depth = push_json_value_getdepth(value);
1202
1203         // The maximum number of Lua stack slots used at each recursion level
1204         // of push_json_value_helper is 2, so make sure there a depth * 2 slots
1205         if (lua_checkstack(L, depth * 2))
1206                 return push_json_value_helper(L, value, nullindex);
1207         else
1208                 return false;
1209 }
1210
1211 // Converts Lua table --> JSON
1212 void read_json_value(lua_State *L, Json::Value &root, int index, u8 recursion)
1213 {
1214         if (recursion > 16) {
1215                 throw SerializationError("Maximum recursion depth exceeded");
1216         }
1217         int type = lua_type(L, index);
1218         if (type == LUA_TBOOLEAN) {
1219                 root = (bool) lua_toboolean(L, index);
1220         } else if (type == LUA_TNUMBER) {
1221                 root = lua_tonumber(L, index);
1222         } else if (type == LUA_TSTRING) {
1223                 size_t len;
1224                 const char *str = lua_tolstring(L, index, &len);
1225                 root = std::string(str, len);
1226         } else if (type == LUA_TTABLE) {
1227                 lua_pushnil(L);
1228                 while (lua_next(L, index)) {
1229                         // Key is at -2 and value is at -1
1230                         Json::Value value;
1231                         read_json_value(L, value, lua_gettop(L), recursion + 1);
1232
1233                         Json::ValueType roottype = root.type();
1234                         int keytype = lua_type(L, -1);
1235                         if (keytype == LUA_TNUMBER) {
1236                                 lua_Number key = lua_tonumber(L, -1);
1237                                 if (roottype != Json::nullValue && roottype != Json::arrayValue) {
1238                                         throw SerializationError("Can't mix array and object values in JSON");
1239                                 } else if (key < 1) {
1240                                         throw SerializationError("Can't use zero-based or negative indexes in JSON");
1241                                 } else if (floor(key) != key) {
1242                                         throw SerializationError("Can't use indexes with a fractional part in JSON");
1243                                 }
1244                                 root[(Json::ArrayIndex) key - 1] = value;
1245                         } else if (keytype == LUA_TSTRING) {
1246                                 if (roottype != Json::nullValue && roottype != Json::objectValue) {
1247                                         throw SerializationError("Can't mix array and object values in JSON");
1248                                 }
1249                                 root[lua_tostring(L, -1)] = value;
1250                         } else {
1251                                 throw SerializationError("Lua key to convert to JSON is not a string or number");
1252                         }
1253                 }
1254         } else if (type == LUA_TNIL) {
1255                 root = Json::nullValue;
1256         } else {
1257                 throw SerializationError("Can only store booleans, numbers, strings, objects, arrays, and null in JSON");
1258         }
1259         lua_pop(L, 1); // Pop value
1260 }