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