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 "mapgen.h"
  35 #include "json/json.h"
  36
  37 struct EnumString es_TileAnimationType[] =
  38 {
  39         {TAT_NONE, "none"},
  40         {TAT_VERTICAL_FRAMES, "vertical_frames"},
  41         {0, NULL},
  42 };
  43
  44 /******************************************************************************/
  45 ItemDefinition read_item_definition(lua_State* L,int index,
  46                 ItemDefinition default_def)
  47 {
  48         if(index < 0)
  49                 index = lua_gettop(L) + 1 + index;
  50
  51         // Read the item definition
  52         ItemDefinition def = default_def;
  53
  54         def.type = (ItemType)getenumfield(L, index, "type",
  55                         es_ItemType, ITEM_NONE);
  56         getstringfield(L, index, "name", def.name);
  57         getstringfield(L, index, "description", def.description);
  58         getstringfield(L, index, "inventory_image", def.inventory_image);
  59         getstringfield(L, index, "wield_image", def.wield_image);
  60
  61         lua_getfield(L, index, "wield_scale");
  62         if(lua_istable(L, -1)){
  63                 def.wield_scale = check_v3f(L, -1);
  64         }
  65         lua_pop(L, 1);
  66
  67         def.stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
  68         if(def.stack_max == 0)
  69                 def.stack_max = 1;
  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         }
 103         lua_pop(L, 1);
 104
 105         def.range = getfloatfield_default(L, index, "range", def.range);
 106
 107         // Client shall immediately place this node when player places the item.
 108         // Server will update the precise end result a moment later.
 109         // "" = no prediction
 110         getstringfield(L, index, "node_placement_prediction",
 111                         def.node_placement_prediction);
 112
 113         return def;
 114 }
 115
 116 /******************************************************************************/
 117 void read_object_properties(lua_State *L, int index,
 118                 ObjectProperties *prop)
 119 {
 120         if(index < 0)
 121                 index = lua_gettop(L) + 1 + index;
 122         if(!lua_istable(L, index))
 123                 return;
 124
 125         prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
 126
 127         getboolfield(L, -1, "physical", prop->physical);
 128         getboolfield(L, -1, "collide_with_objects", prop->collideWithObjects);
 129
 130         getfloatfield(L, -1, "weight", prop->weight);
 131
 132         lua_getfield(L, -1, "collisionbox");
 133         if(lua_istable(L, -1))
 134                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
 135         lua_pop(L, 1);
 136
 137         getstringfield(L, -1, "visual", prop->visual);
 138
 139         getstringfield(L, -1, "mesh", prop->mesh);
 140
 141         lua_getfield(L, -1, "visual_size");
 142         if(lua_istable(L, -1))
 143                 prop->visual_size = read_v2f(L, -1);
 144         lua_pop(L, 1);
 145
 146         lua_getfield(L, -1, "textures");
 147         if(lua_istable(L, -1)){
 148                 prop->textures.clear();
 149                 int table = lua_gettop(L);
 150                 lua_pushnil(L);
 151                 while(lua_next(L, table) != 0){
 152                         // key at index -2 and value at index -1
 153                         if(lua_isstring(L, -1))
 154                                 prop->textures.push_back(lua_tostring(L, -1));
 155                         else
 156                                 prop->textures.push_back("");
 157                         // removes value, keeps key for next iteration
 158                         lua_pop(L, 1);
 159                 }
 160         }
 161         lua_pop(L, 1);
 162
 163         lua_getfield(L, -1, "colors");
 164         if(lua_istable(L, -1)){
 165                 prop->colors.clear();
 166                 int table = lua_gettop(L);
 167                 lua_pushnil(L);
 168                 while(lua_next(L, table) != 0){
 169                         // key at index -2 and value at index -1
 170                         if(lua_isstring(L, -1))
 171                                 prop->colors.push_back(readARGB8(L, -1));
 172                         else
 173                                 prop->colors.push_back(video::SColor(255, 255, 255, 255));
 174                         // removes value, keeps key for next iteration
 175                         lua_pop(L, 1);
 176                 }
 177         }
 178         lua_pop(L, 1);
 179
 180         lua_getfield(L, -1, "spritediv");
 181         if(lua_istable(L, -1))
 182                 prop->spritediv = read_v2s16(L, -1);
 183         lua_pop(L, 1);
 184
 185         lua_getfield(L, -1, "initial_sprite_basepos");
 186         if(lua_istable(L, -1))
 187                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 188         lua_pop(L, 1);
 189
 190         getboolfield(L, -1, "is_visible", prop->is_visible);
 191         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 192         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 193         getfloatfield(L, -1, "stepheight", prop->stepheight);
 194         prop->stepheight*=BS;
 195         lua_getfield(L, -1, "automatic_face_movement_dir");
 196         if (lua_isnumber(L, -1)) {
 197                 prop->automatic_face_movement_dir = true;
 198                 prop->automatic_face_movement_dir_offset = luaL_checknumber(L, -1);
 199         } else if (lua_isboolean(L, -1)) {
 200                 prop->automatic_face_movement_dir = lua_toboolean(L, -1);
 201                 prop->automatic_face_movement_dir_offset = 0.0;
 202         }
 203         lua_pop(L, 1);
 204 }
 205
 206 /******************************************************************************/
 207 TileDef read_tiledef(lua_State *L, int index)
 208 {
 209         if(index < 0)
 210                 index = lua_gettop(L) + 1 + index;
 211
 212         TileDef tiledef;
 213
 214         // key at index -2 and value at index
 215         if(lua_isstring(L, index)){
 216                 // "default_lava.png"
 217                 tiledef.name = lua_tostring(L, index);
 218         }
 219         else if(lua_istable(L, index))
 220         {
 221                 // {name="default_lava.png", animation={}}
 222                 tiledef.name = "";
 223                 getstringfield(L, index, "name", tiledef.name);
 224                 getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
 225                 tiledef.backface_culling = getboolfield_default(
 226                                         L, index, "backface_culling", true);
 227                 // animation = {}
 228                 lua_getfield(L, index, "animation");
 229                 if(lua_istable(L, -1)){
 230                         // {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
 231                         tiledef.animation.type = (TileAnimationType)
 232                                         getenumfield(L, -1, "type", es_TileAnimationType,
 233                                         TAT_NONE);
 234                         tiledef.animation.aspect_w =
 235                                         getintfield_default(L, -1, "aspect_w", 16);
 236                         tiledef.animation.aspect_h =
 237                                         getintfield_default(L, -1, "aspect_h", 16);
 238                         tiledef.animation.length =
 239                                         getfloatfield_default(L, -1, "length", 1.0);
 240                 }
 241                 lua_pop(L, 1);
 242         }
 243
 244         return tiledef;
 245 }
 246
 247 /******************************************************************************/
 248 ContentFeatures read_content_features(lua_State *L, int index)
 249 {
 250         if(index < 0)
 251                 index = lua_gettop(L) + 1 + index;
 252
 253         ContentFeatures f;
 254
 255         /* Cache existence of some callbacks */
 256         lua_getfield(L, index, "on_construct");
 257         if(!lua_isnil(L, -1)) f.has_on_construct = true;
 258         lua_pop(L, 1);
 259         lua_getfield(L, index, "on_destruct");
 260         if(!lua_isnil(L, -1)) f.has_on_destruct = true;
 261         lua_pop(L, 1);
 262         lua_getfield(L, index, "after_destruct");
 263         if(!lua_isnil(L, -1)) f.has_after_destruct = true;
 264         lua_pop(L, 1);
 265
 266         lua_getfield(L, index, "on_rightclick");
 267         f.rightclickable = lua_isfunction(L, -1);
 268         lua_pop(L, 1);
 269
 270         /* Name */
 271         getstringfield(L, index, "name", f.name);
 272
 273         /* Groups */
 274         lua_getfield(L, index, "groups");
 275         read_groups(L, -1, f.groups);
 276         lua_pop(L, 1);
 277
 278         /* Visual definition */
 279
 280         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype",
 281                         ScriptApiNode::es_DrawType,NDT_NORMAL);
 282         getfloatfield(L, index, "visual_scale", f.visual_scale);
 283
 284         // tiles = {}
 285         lua_getfield(L, index, "tiles");
 286         // If nil, try the deprecated name "tile_images" instead
 287         if(lua_isnil(L, -1)){
 288                 lua_pop(L, 1);
 289                 warn_if_field_exists(L, index, "tile_images",
 290                                 "Deprecated; new name is \"tiles\".");
 291                 lua_getfield(L, index, "tile_images");
 292         }
 293         if(lua_istable(L, -1)){
 294                 int table = lua_gettop(L);
 295                 lua_pushnil(L);
 296                 int i = 0;
 297                 while(lua_next(L, table) != 0){
 298                         // Read tiledef from value
 299                         f.tiledef[i] = read_tiledef(L, -1);
 300                         // removes value, keeps key for next iteration
 301                         lua_pop(L, 1);
 302                         i++;
 303                         if(i==6){
 304                                 lua_pop(L, 1);
 305                                 break;
 306                         }
 307                 }
 308                 // Copy last value to all remaining textures
 309                 if(i >= 1){
 310                         TileDef lasttile = f.tiledef[i-1];
 311                         while(i < 6){
 312                                 f.tiledef[i] = lasttile;
 313                                 i++;
 314                         }
 315                 }
 316         }
 317         lua_pop(L, 1);
 318
 319         // special_tiles = {}
 320         lua_getfield(L, index, "special_tiles");
 321         // If nil, try the deprecated name "special_materials" instead
 322         if(lua_isnil(L, -1)){
 323                 lua_pop(L, 1);
 324                 warn_if_field_exists(L, index, "special_materials",
 325                                 "Deprecated; new name is \"special_tiles\".");
 326                 lua_getfield(L, index, "special_materials");
 327         }
 328         if(lua_istable(L, -1)){
 329                 int table = lua_gettop(L);
 330                 lua_pushnil(L);
 331                 int i = 0;
 332                 while(lua_next(L, table) != 0){
 333                         // Read tiledef from value
 334                         f.tiledef_special[i] = read_tiledef(L, -1);
 335                         // removes value, keeps key for next iteration
 336                         lua_pop(L, 1);
 337                         i++;
 338                         if(i==CF_SPECIAL_COUNT){
 339                                 lua_pop(L, 1);
 340                                 break;
 341                         }
 342                 }
 343         }
 344         lua_pop(L, 1);
 345
 346         f.alpha = getintfield_default(L, index, "alpha", 255);
 347
 348         bool usealpha = getboolfield_default(L, index,
 349                         "use_texture_alpha", false);
 350         if (usealpha)
 351                 f.alpha = 0;
 352
 353         /* Other stuff */
 354
 355         lua_getfield(L, index, "post_effect_color");
 356         if(!lua_isnil(L, -1))
 357                 f.post_effect_color = readARGB8(L, -1);
 358         lua_pop(L, 1);
 359
 360         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
 361                         ScriptApiNode::es_ContentParamType, CPT_NONE);
 362         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
 363                         ScriptApiNode::es_ContentParamType2, CPT2_NONE);
 364
 365         // Warn about some deprecated fields
 366         warn_if_field_exists(L, index, "wall_mounted",
 367                         "deprecated: use paramtype2 = 'wallmounted'");
 368         warn_if_field_exists(L, index, "light_propagates",
 369                         "deprecated: determined from paramtype");
 370         warn_if_field_exists(L, index, "dug_item",
 371                         "deprecated: use 'drop' field");
 372         warn_if_field_exists(L, index, "extra_dug_item",
 373                         "deprecated: use 'drop' field");
 374         warn_if_field_exists(L, index, "extra_dug_item_rarity",
 375                         "deprecated: use 'drop' field");
 376         warn_if_field_exists(L, index, "metadata_name",
 377                         "deprecated: use on_add and metadata callbacks");
 378
 379         // True for all ground-like things like stone and mud, false for eg. trees
 380         getboolfield(L, index, "is_ground_content", f.is_ground_content);
 381         f.light_propagates = (f.param_type == CPT_LIGHT);
 382         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
 383         // This is used for collision detection.
 384         // Also for general solidness queries.
 385         getboolfield(L, index, "walkable", f.walkable);
 386         // Player can point to these
 387         getboolfield(L, index, "pointable", f.pointable);
 388         // Player can dig these
 389         getboolfield(L, index, "diggable", f.diggable);
 390         // Player can climb these
 391         getboolfield(L, index, "climbable", f.climbable);
 392         // Player can build on these
 393         getboolfield(L, index, "buildable_to", f.buildable_to);
 394         // Whether the node is non-liquid, source liquid or flowing liquid
 395         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
 396                         ScriptApiNode::es_LiquidType, LIQUID_NONE);
 397         // If the content is liquid, this is the flowing version of the liquid.
 398         getstringfield(L, index, "liquid_alternative_flowing",
 399                         f.liquid_alternative_flowing);
 400         // If the content is liquid, this is the source version of the liquid.
 401         getstringfield(L, index, "liquid_alternative_source",
 402                         f.liquid_alternative_source);
 403         // Viscosity for fluid flow, ranging from 1 to 7, with
 404         // 1 giving almost instantaneous propagation and 7 being
 405         // the slowest possible
 406         f.liquid_viscosity = getintfield_default(L, index,
 407                         "liquid_viscosity", f.liquid_viscosity);
 408         f.liquid_range = getintfield_default(L, index,
 409                         "liquid_range", f.liquid_range);
 410         f.leveled = getintfield_default(L, index, "leveled", f.leveled);
 411
 412         getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
 413         getstringfield(L, index, "freezemelt", f.freezemelt);
 414         f.drowning = getintfield_default(L, index,
 415                         "drowning", f.drowning);
 416         // Amount of light the node emits
 417         f.light_source = getintfield_default(L, index,
 418                         "light_source", f.light_source);
 419         f.damage_per_second = getintfield_default(L, index,
 420                         "damage_per_second", f.damage_per_second);
 421
 422         lua_getfield(L, index, "node_box");
 423         if(lua_istable(L, -1))
 424                 f.node_box = read_nodebox(L, -1);
 425         lua_pop(L, 1);
 426
 427         lua_getfield(L, index, "selection_box");
 428         if(lua_istable(L, -1))
 429                 f.selection_box = read_nodebox(L, -1);
 430         lua_pop(L, 1);
 431
 432         f.waving = getintfield_default(L, index,
 433                         "waving", f.waving);
 434
 435         // Set to true if paramtype used to be 'facedir_simple'
 436         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
 437         // Set to true if wall_mounted used to be set to true
 438         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
 439
 440         // Sound table
 441         lua_getfield(L, index, "sounds");
 442         if(lua_istable(L, -1)){
 443                 lua_getfield(L, -1, "footstep");
 444                 read_soundspec(L, -1, f.sound_footstep);
 445                 lua_pop(L, 1);
 446                 lua_getfield(L, -1, "dig");
 447                 read_soundspec(L, -1, f.sound_dig);
 448                 lua_pop(L, 1);
 449                 lua_getfield(L, -1, "dug");
 450                 read_soundspec(L, -1, f.sound_dug);
 451                 lua_pop(L, 1);
 452         }
 453         lua_pop(L, 1);
 454
 455         return f;
 456 }
 457
 458 /******************************************************************************/
 459 void read_server_sound_params(lua_State *L, int index,
 460                 ServerSoundParams &params)
 461 {
 462         if(index < 0)
 463                 index = lua_gettop(L) + 1 + index;
 464         // Clear
 465         params = ServerSoundParams();
 466         if(lua_istable(L, index)){
 467                 getfloatfield(L, index, "gain", params.gain);
 468                 getstringfield(L, index, "to_player", params.to_player);
 469                 lua_getfield(L, index, "pos");
 470                 if(!lua_isnil(L, -1)){
 471                         v3f p = read_v3f(L, -1)*BS;
 472                         params.pos = p;
 473                         params.type = ServerSoundParams::SSP_POSITIONAL;
 474                 }
 475                 lua_pop(L, 1);
 476                 lua_getfield(L, index, "object");
 477                 if(!lua_isnil(L, -1)){
 478                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
 479                         ServerActiveObject *sao = ObjectRef::getobject(ref);
 480                         if(sao){
 481                                 params.object = sao->getId();
 482                                 params.type = ServerSoundParams::SSP_OBJECT;
 483                         }
 484                 }
 485                 lua_pop(L, 1);
 486                 params.max_hear_distance = BS*getfloatfield_default(L, index,
 487                                 "max_hear_distance", params.max_hear_distance/BS);
 488                 getboolfield(L, index, "loop", params.loop);
 489         }
 490 }
 491
 492 /******************************************************************************/
 493 void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
 494 {
 495         if(index < 0)
 496                 index = lua_gettop(L) + 1 + index;
 497         if(lua_isnil(L, index)){
 498         } else if(lua_istable(L, index)){
 499                 getstringfield(L, index, "name", spec.name);
 500                 getfloatfield(L, index, "gain", spec.gain);
 501         } else if(lua_isstring(L, index)){
 502                 spec.name = lua_tostring(L, index);
 503         }
 504 }
 505
 506 /******************************************************************************/
 507 NodeBox read_nodebox(lua_State *L, int index)
 508 {
 509         NodeBox nodebox;
 510         if(lua_istable(L, -1)){
 511                 nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
 512                                 ScriptApiNode::es_NodeBoxType, NODEBOX_REGULAR);
 513
 514                 lua_getfield(L, index, "fixed");
 515                 if(lua_istable(L, -1))
 516                         nodebox.fixed = read_aabb3f_vector(L, -1, BS);
 517                 lua_pop(L, 1);
 518
 519                 lua_getfield(L, index, "wall_top");
 520                 if(lua_istable(L, -1))
 521                         nodebox.wall_top = read_aabb3f(L, -1, BS);
 522                 lua_pop(L, 1);
 523
 524                 lua_getfield(L, index, "wall_bottom");
 525                 if(lua_istable(L, -1))
 526                         nodebox.wall_bottom = read_aabb3f(L, -1, BS);
 527                 lua_pop(L, 1);
 528
 529                 lua_getfield(L, index, "wall_side");
 530                 if(lua_istable(L, -1))
 531                         nodebox.wall_side = read_aabb3f(L, -1, BS);
 532                 lua_pop(L, 1);
 533         }
 534         return nodebox;
 535 }
 536
 537 /******************************************************************************/
 538 MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
 539 {
 540         lua_getfield(L, index, "name");
 541         const char *name = luaL_checkstring(L, -1);
 542         lua_pop(L, 1);
 543         u8 param1;
 544         lua_getfield(L, index, "param1");
 545         if(lua_isnil(L, -1))
 546                 param1 = 0;
 547         else
 548                 param1 = lua_tonumber(L, -1);
 549         lua_pop(L, 1);
 550         u8 param2;
 551         lua_getfield(L, index, "param2");
 552         if(lua_isnil(L, -1))
 553                 param2 = 0;
 554         else
 555                 param2 = lua_tonumber(L, -1);
 556         lua_pop(L, 1);
 557         return MapNode(ndef, name, param1, param2);
 558 }
 559
 560 /******************************************************************************/
 561 void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
 562 {
 563         lua_newtable(L);
 564         lua_pushstring(L, ndef->get(n).name.c_str());
 565         lua_setfield(L, -2, "name");
 566         lua_pushnumber(L, n.getParam1());
 567         lua_setfield(L, -2, "param1");
 568         lua_pushnumber(L, n.getParam2());
 569         lua_setfield(L, -2, "param2");
 570 }
 571
 572 /******************************************************************************/
 573 void warn_if_field_exists(lua_State *L, int table,
 574                 const char *fieldname, const std::string &message)
 575 {
 576         lua_getfield(L, table, fieldname);
 577         if(!lua_isnil(L, -1)){
 578 //TODO find way to access backtrace fct from here
 579                 //              infostream<<script_get_backtrace(L)<<std::endl;
 580                 infostream<<"WARNING: field \""<<fieldname<<"\": "
 581                                 <<message<<std::endl;
 582         }
 583         lua_pop(L, 1);
 584 }
 585
 586 /******************************************************************************/
 587 int getenumfield(lua_State *L, int table,
 588                 const char *fieldname, const EnumString *spec, int default_)
 589 {
 590         int result = default_;
 591         string_to_enum(spec, result,
 592                         getstringfield_default(L, table, fieldname, ""));
 593         return result;
 594 }
 595
 596 /******************************************************************************/
 597 bool string_to_enum(const EnumString *spec, int &result,
 598                 const std::string &str)
 599 {
 600         const EnumString *esp = spec;
 601         while(esp->str){
 602                 if(str == std::string(esp->str)){
 603                         result = esp->num;
 604                         return true;
 605                 }
 606                 esp++;
 607         }
 608         return false;
 609 }
 610
 611 /******************************************************************************/
 612 ItemStack read_item(lua_State* L, int index,Server* srv)
 613 {
 614         if(index < 0)
 615                 index = lua_gettop(L) + 1 + index;
 616
 617         if(lua_isnil(L, index))
 618         {
 619                 return ItemStack();
 620         }
 621         else if(lua_isuserdata(L, index))
 622         {
 623                 // Convert from LuaItemStack
 624                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
 625                 return o->getItem();
 626         }
 627         else if(lua_isstring(L, index))
 628         {
 629                 // Convert from itemstring
 630                 std::string itemstring = lua_tostring(L, index);
 631                 IItemDefManager *idef = srv->idef();
 632                 try
 633                 {
 634                         ItemStack item;
 635                         item.deSerialize(itemstring, idef);
 636                         return item;
 637                 }
 638                 catch(SerializationError &e)
 639                 {
 640                         infostream<<"WARNING: unable to create item from itemstring"
 641                                         <<": "<<itemstring<<std::endl;
 642                         return ItemStack();
 643                 }
 644         }
 645         else if(lua_istable(L, index))
 646         {
 647                 // Convert from table
 648                 IItemDefManager *idef = srv->idef();
 649                 std::string name = getstringfield_default(L, index, "name", "");
 650                 int count = getintfield_default(L, index, "count", 1);
 651                 int wear = getintfield_default(L, index, "wear", 0);
 652                 std::string metadata = getstringfield_default(L, index, "metadata", "");
 653                 return ItemStack(name, count, wear, metadata, idef);
 654         }
 655         else
 656         {
 657                 throw LuaError(NULL, "Expecting itemstack, itemstring, table or nil");
 658         }
 659 }
 660
 661 /******************************************************************************/
 662 void push_tool_capabilities(lua_State *L,
 663                 const ToolCapabilities &toolcap)
 664 {
 665         lua_newtable(L);
 666         setfloatfield(L, -1, "full_punch_interval", toolcap.full_punch_interval);
 667                 setintfield(L, -1, "max_drop_level", toolcap.max_drop_level);
 668                 // Create groupcaps table
 669                 lua_newtable(L);
 670                 // For each groupcap
 671                 for(std::map<std::string, ToolGroupCap>::const_iterator
 672                                 i = toolcap.groupcaps.begin(); i != toolcap.groupcaps.end(); i++){
 673                         // Create groupcap table
 674                         lua_newtable(L);
 675                         const std::string &name = i->first;
 676                         const ToolGroupCap &groupcap = i->second;
 677                         // Create subtable "times"
 678                         lua_newtable(L);
 679                         for(std::map<int, float>::const_iterator
 680                                         i = groupcap.times.begin(); i != groupcap.times.end(); i++){
 681                                 int rating = i->first;
 682                                 float time = i->second;
 683                                 lua_pushinteger(L, rating);
 684                                 lua_pushnumber(L, time);
 685                                 lua_settable(L, -3);
 686                         }
 687                         // Set subtable "times"
 688                         lua_setfield(L, -2, "times");
 689                         // Set simple parameters
 690                         setintfield(L, -1, "maxlevel", groupcap.maxlevel);
 691                         setintfield(L, -1, "uses", groupcap.uses);
 692                         // Insert groupcap table into groupcaps table
 693                         lua_setfield(L, -2, name.c_str());
 694                 }
 695                 // Set groupcaps table
 696                 lua_setfield(L, -2, "groupcaps");
 697                 //Create damage_groups table
 698                 lua_newtable(L);
 699                 // For each damage group
 700                 for(std::map<std::string, s16>::const_iterator
 701                                 i = toolcap.damageGroups.begin(); i != toolcap.damageGroups.end(); i++){
 702                         // Create damage group table
 703                         lua_pushinteger(L, i->second);
 704                         lua_setfield(L, -2, i->first.c_str());
 705                 }
 706                 lua_setfield(L, -2, "damage_groups");
 707 }
 708
 709 /******************************************************************************/
 710 void push_inventory_list(lua_State *L, Inventory *inv, const char *name)
 711 {
 712         InventoryList *invlist = inv->getList(name);
 713         if(invlist == NULL){
 714                 lua_pushnil(L);
 715                 return;
 716         }
 717         std::vector<ItemStack> items;
 718         for(u32 i=0; i<invlist->getSize(); i++)
 719                 items.push_back(invlist->getItem(i));
 720         push_items(L, items);
 721 }
 722
 723 /******************************************************************************/
 724 void read_inventory_list(lua_State *L, int tableindex,
 725                 Inventory *inv, const char *name, Server* srv, int forcesize)
 726 {
 727         if(tableindex < 0)
 728                 tableindex = lua_gettop(L) + 1 + tableindex;
 729         // If nil, delete list
 730         if(lua_isnil(L, tableindex)){
 731                 inv->deleteList(name);
 732                 return;
 733         }
 734         // Otherwise set list
 735         std::vector<ItemStack> items = read_items(L, tableindex,srv);
 736         int listsize = (forcesize != -1) ? forcesize : items.size();
 737         InventoryList *invlist = inv->addList(name, listsize);
 738         int index = 0;
 739         for(std::vector<ItemStack>::const_iterator
 740                         i = items.begin(); i != items.end(); i++){
 741                 if(forcesize != -1 && index == forcesize)
 742                         break;
 743                 invlist->changeItem(index, *i);
 744                 index++;
 745         }
 746         while(forcesize != -1 && index < forcesize){
 747                 invlist->deleteItem(index);
 748                 index++;
 749         }
 750 }
 751
 752 /******************************************************************************/
 753 ToolCapabilities read_tool_capabilities(
 754                 lua_State *L, int table)
 755 {
 756         ToolCapabilities toolcap;
 757         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
 758         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
 759         lua_getfield(L, table, "groupcaps");
 760         if(lua_istable(L, -1)){
 761                 int table_groupcaps = lua_gettop(L);
 762                 lua_pushnil(L);
 763                 while(lua_next(L, table_groupcaps) != 0){
 764                         // key at index -2 and value at index -1
 765                         std::string groupname = luaL_checkstring(L, -2);
 766                         if(lua_istable(L, -1)){
 767                                 int table_groupcap = lua_gettop(L);
 768                                 // This will be created
 769                                 ToolGroupCap groupcap;
 770                                 // Read simple parameters
 771                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
 772                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
 773                                 // DEPRECATED: maxwear
 774                                 float maxwear = 0;
 775                                 if(getfloatfield(L, table_groupcap, "maxwear", maxwear)){
 776                                         if(maxwear != 0)
 777                                                 groupcap.uses = 1.0/maxwear;
 778                                         else
 779                                                 groupcap.uses = 0;
 780                                         infostream<<script_get_backtrace(L)<<std::endl;
 781                                         infostream<<"WARNING: field \"maxwear\" is deprecated; "
 782                                                         <<"should replace with uses=1/maxwear"<<std::endl;
 783                                 }
 784                                 // Read "times" table
 785                                 lua_getfield(L, table_groupcap, "times");
 786                                 if(lua_istable(L, -1)){
 787                                         int table_times = lua_gettop(L);
 788                                         lua_pushnil(L);
 789                                         while(lua_next(L, table_times) != 0){
 790                                                 // key at index -2 and value at index -1
 791                                                 int rating = luaL_checkinteger(L, -2);
 792                                                 float time = luaL_checknumber(L, -1);
 793                                                 groupcap.times[rating] = time;
 794                                                 // removes value, keeps key for next iteration
 795                                                 lua_pop(L, 1);
 796                                         }
 797                                 }
 798                                 lua_pop(L, 1);
 799                                 // Insert groupcap into toolcap
 800                                 toolcap.groupcaps[groupname] = groupcap;
 801                         }
 802                         // removes value, keeps key for next iteration
 803                         lua_pop(L, 1);
 804                 }
 805         }
 806         lua_pop(L, 1);
 807
 808         lua_getfield(L, table, "damage_groups");
 809         if(lua_istable(L, -1)){
 810                 int table_damage_groups = lua_gettop(L);
 811                 lua_pushnil(L);
 812                 while(lua_next(L, table_damage_groups) != 0){
 813                         // key at index -2 and value at index -1
 814                         std::string groupname = luaL_checkstring(L, -2);
 815                         u16 value = luaL_checkinteger(L, -1);
 816                         toolcap.damageGroups[groupname] = value;
 817                         // removes value, keeps key for next iteration
 818                         lua_pop(L, 1);
 819                 }
 820         }
 821         lua_pop(L, 1);
 822         return toolcap;
 823 }
 824
 825 /******************************************************************************/
 826 void push_dig_params(lua_State *L,const DigParams &params)
 827 {
 828         lua_newtable(L);
 829         setboolfield(L, -1, "diggable", params.diggable);
 830         setfloatfield(L, -1, "time", params.time);
 831         setintfield(L, -1, "wear", params.wear);
 832 }
 833
 834 /******************************************************************************/
 835 void push_hit_params(lua_State *L,const HitParams &params)
 836 {
 837         lua_newtable(L);
 838         setintfield(L, -1, "hp", params.hp);
 839         setintfield(L, -1, "wear", params.wear);
 840 }
 841
 842 /******************************************************************************/
 843 u32 getflagsfield(lua_State *L, int table, const char *fieldname,
 844         FlagDesc *flagdesc, u32 *flagmask)
 845 {
 846         u32 flags = 0;
 847
 848         lua_getfield(L, table, fieldname);
 849
 850         if (lua_isstring(L, -1)) {
 851                 std::string flagstr = lua_tostring(L, -1);
 852                 flags = readFlagString(flagstr, flagdesc, flagmask);
 853         } else if (lua_istable(L, -1)) {
 854                 flags = read_flags_table(L, -1, flagdesc, flagmask);
 855         }
 856
 857         lua_pop(L, 1);
 858
 859         return flags;
 860 }
 861
 862 u32 read_flags_table(lua_State *L, int table, FlagDesc *flagdesc, u32 *flagmask)
 863 {
 864         u32 flags = 0, mask = 0;
 865         char fnamebuf[64] = "no";
 866
 867         for (int i = 0; flagdesc[i].name; i++) {
 868                 bool result;
 869
 870                 if (getboolfield(L, table, flagdesc[i].name, result)) {
 871                         mask |= flagdesc[i].flag;
 872                         if (result)
 873                                 flags |= flagdesc[i].flag;
 874                 }
 875
 876                 strlcpy(fnamebuf + 2, flagdesc[i].name, sizeof(fnamebuf) - 2);
 877                 if (getboolfield(L, table, fnamebuf, result))
 878                         mask |= flagdesc[i].flag;
 879         }
 880
 881         if (flagmask)
 882                 *flagmask = mask;
 883
 884         return flags;
 885 }
 886
 887 /******************************************************************************/
 888 /* Lua Stored data!                                                           */
 889 /******************************************************************************/
 890
 891 /******************************************************************************/
 892 void read_groups(lua_State *L, int index,
 893                 std::map<std::string, int> &result)
 894 {
 895         if (!lua_istable(L,index))
 896                 return;
 897         result.clear();
 898         lua_pushnil(L);
 899         if(index < 0)
 900                 index -= 1;
 901         while(lua_next(L, index) != 0){
 902                 // key at index -2 and value at index -1
 903                 std::string name = luaL_checkstring(L, -2);
 904                 int rating = luaL_checkinteger(L, -1);
 905                 result[name] = rating;
 906                 // removes value, keeps key for next iteration
 907                 lua_pop(L, 1);
 908         }
 909 }
 910
 911 /******************************************************************************/
 912 void push_items(lua_State *L, const std::vector<ItemStack> &items)
 913 {
 914         // Create and fill table
 915         lua_createtable(L, items.size(), 0);
 916         std::vector<ItemStack>::const_iterator iter = items.begin();
 917         for (u32 i = 0; iter != items.end(); iter++) {
 918                 LuaItemStack::create(L, *iter);
 919                 lua_rawseti(L, -2, ++i);
 920         }
 921 }
 922
 923 /******************************************************************************/
 924 std::vector<ItemStack> read_items(lua_State *L, int index, Server *srv)
 925 {
 926         if(index < 0)
 927                 index = lua_gettop(L) + 1 + index;
 928
 929         std::vector<ItemStack> items;
 930         luaL_checktype(L, index, LUA_TTABLE);
 931         lua_pushnil(L);
 932         while (lua_next(L, index)) {
 933                 s32 key = luaL_checkinteger(L, -2);
 934                 if (key < 1) {
 935                         throw LuaError(NULL, "Invalid inventory list index");
 936                 }
 937                 if (items.size() < (u32) key) {
 938                         items.resize(key);
 939                 }
 940                 items[key - 1] = read_item(L, -1, srv);
 941                 lua_pop(L, 1);
 942         }
 943         return items;
 944 }
 945
 946 /******************************************************************************/
 947 void luaentity_get(lua_State *L, u16 id)
 948 {
 949         // Get minetest.luaentities[i]
 950         lua_getglobal(L, "minetest");
 951         lua_getfield(L, -1, "luaentities");
 952         luaL_checktype(L, -1, LUA_TTABLE);
 953         lua_pushnumber(L, id);
 954         lua_gettable(L, -2);
 955         lua_remove(L, -2); // luaentities
 956         lua_remove(L, -2); // minetest
 957 }
 958
 959 /******************************************************************************/
 960 NoiseParams *read_noiseparams(lua_State *L, int index)
 961 {
 962         if (index < 0)
 963                 index = lua_gettop(L) + 1 + index;
 964
 965         if (!lua_istable(L, index))
 966                 return NULL;
 967
 968         NoiseParams *np = new NoiseParams;
 969
 970         np->offset  = getfloatfield_default(L, index, "offset", 0.0);
 971         np->scale   = getfloatfield_default(L, index, "scale", 0.0);
 972         lua_getfield(L, index, "spread");
 973         np->spread  = read_v3f(L, -1);
 974         lua_pop(L, 1);
 975         np->seed    = getintfield_default(L, index, "seed", 0);
 976         np->octaves = getintfield_default(L, index, "octaves", 0);
 977         np->persist = getfloatfield_default(L, index, "persist", 0.0);
 978
 979         return np;
 980 }
 981
 982 /******************************************************************************/
 983 bool read_schematic(lua_State *L, int index, DecoSchematic *dschem, Server *server) {
 984         if (index < 0)
 985                 index = lua_gettop(L) + 1 + index;
 986
 987         INodeDefManager *ndef = server->getNodeDefManager();
 988
 989         if (lua_istable(L, index)) {
 990                 lua_getfield(L, index, "size");
 991                 v3s16 size = read_v3s16(L, -1);
 992                 lua_pop(L, 1);
 993
 994                 int numnodes = size.X * size.Y * size.Z;
 995                 MapNode *schemdata = new MapNode[numnodes];
 996                 int i = 0;
 997
 998                 // Get schematic data
 999                 lua_getfield(L, index, "data");
1000                 luaL_checktype(L, -1, LUA_TTABLE);
1001
1002                 lua_pushnil(L);
1003                 while (lua_next(L, -2)) {
1004                         if (i < numnodes) {
1005                                 // same as readnode, except param1 default is MTSCHEM_PROB_CONST
1006                                 lua_getfield(L, -1, "name");
1007                                 const char *name = luaL_checkstring(L, -1);
1008                                 lua_pop(L, 1);
1009
1010                                 u8 param1;
1011                                 lua_getfield(L, -1, "param1");
1012                                 param1 = !lua_isnil(L, -1) ? lua_tonumber(L, -1) : MTSCHEM_PROB_ALWAYS;
1013                                 lua_pop(L, 1);
1014
1015                                 u8 param2;
1016                                 lua_getfield(L, -1, "param2");
1017                                 param2 = !lua_isnil(L, -1) ? lua_tonumber(L, -1) : 0;
1018                                 lua_pop(L, 1);
1019
1020                                 schemdata[i] = MapNode(ndef, name, param1, param2);
1021                         }
1022
1023                         i++;
1024                         lua_pop(L, 1);
1025                 }
1026
1027                 if (i != numnodes) {
1028                         errorstream << "read_schematic: incorrect number of "
1029                                 "nodes provided in raw schematic data (got " << i <<
1030                                 ", expected " << numnodes << ")." << std::endl;
1031                         return false;
1032                 }
1033
1034                 u8 *sliceprobs = new u8[size.Y];
1035                 for (i = 0; i != size.Y; i++)
1036                         sliceprobs[i] = MTSCHEM_PROB_ALWAYS;
1037
1038                 // Get Y-slice probability values (if present)
1039                 lua_getfield(L, index, "yslice_prob");
1040                 if (lua_istable(L, -1)) {
1041                         lua_pushnil(L);
1042                         while (lua_next(L, -2)) {
1043                                 if (getintfield(L, -1, "ypos", i) && i >= 0 && i < size.Y) {
1044                                         sliceprobs[i] = getintfield_default(L, -1,
1045                                                 "prob", MTSCHEM_PROB_ALWAYS);
1046                                 }
1047                                 lua_pop(L, 1);
1048                         }
1049                 }
1050
1051                 dschem->size        = size;
1052                 dschem->schematic   = schemdata;
1053                 dschem->slice_probs = sliceprobs;
1054
1055         } else if (lua_isstring(L, index)) {
1056                 dschem->filename = std::string(lua_tostring(L, index));
1057         } else {
1058                 errorstream << "read_schematic: missing schematic "
1059                         "filename or raw schematic data" << std::endl;
1060                 return false;
1061         }
1062
1063         return true;
1064 }
1065
1066 /******************************************************************************/
1067 // Returns depth of json value tree
1068 static int push_json_value_getdepth(const Json::Value &value)
1069 {
1070         if (!value.isArray() && !value.isObject())
1071                 return 1;
1072
1073         int maxdepth = 0;
1074         for (Json::Value::const_iterator it = value.begin();
1075                         it != value.end(); ++it) {
1076                 int elemdepth = push_json_value_getdepth(*it);
1077                 if (elemdepth > maxdepth)
1078                         maxdepth = elemdepth;
1079         }
1080         return maxdepth + 1;
1081 }
1082 // Recursive function to convert JSON --> Lua table
1083 static bool push_json_value_helper(lua_State *L, const Json::Value &value,
1084                 int nullindex)
1085 {
1086         switch(value.type()) {
1087                 case Json::nullValue:
1088                 default:
1089                         lua_pushvalue(L, nullindex);
1090                         break;
1091                 case Json::intValue:
1092                         lua_pushinteger(L, value.asInt());
1093                         break;
1094                 case Json::uintValue:
1095                         lua_pushinteger(L, value.asUInt());
1096                         break;
1097                 case Json::realValue:
1098                         lua_pushnumber(L, value.asDouble());
1099                         break;
1100                 case Json::stringValue:
1101                         {
1102                                 const char *str = value.asCString();
1103                                 lua_pushstring(L, str ? str : "");
1104                         }
1105                         break;
1106                 case Json::booleanValue:
1107                         lua_pushboolean(L, value.asInt());
1108                         break;
1109                 case Json::arrayValue:
1110                         lua_newtable(L);
1111                         for (Json::Value::const_iterator it = value.begin();
1112                                         it != value.end(); ++it) {
1113                                 push_json_value_helper(L, *it, nullindex);
1114                                 lua_rawseti(L, -2, it.index() + 1);
1115                         }
1116                         break;
1117                 case Json::objectValue:
1118                         lua_newtable(L);
1119                         for (Json::Value::const_iterator it = value.begin();
1120                                         it != value.end(); ++it) {
1121                                 const char *str = it.memberName();
1122                                 lua_pushstring(L, str ? str : "");
1123                                 push_json_value_helper(L, *it, nullindex);
1124                                 lua_rawset(L, -3);
1125                         }
1126                         break;
1127         }
1128         return true;
1129 }
1130 // converts JSON --> Lua table; returns false if lua stack limit exceeded
1131 // nullindex: Lua stack index of value to use in place of JSON null
1132 bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
1133 {
1134         if(nullindex < 0)
1135                 nullindex = lua_gettop(L) + 1 + nullindex;
1136
1137         int depth = push_json_value_getdepth(value);
1138
1139         // The maximum number of Lua stack slots used at each recursion level
1140         // of push_json_value_helper is 2, so make sure there a depth * 2 slots
1141         if (lua_checkstack(L, depth * 2))
1142                 return push_json_value_helper(L, value, nullindex);
1143         else
1144                 return false;
1145 }
1146
1147 // Converts Lua table --> JSON
1148 void read_json_value(lua_State *L, Json::Value &root, int index, u8 recursion)
1149 {
1150         if (recursion > 16) {
1151                 throw SerializationError("Maximum recursion depth exceeded");
1152         }
1153         int type = lua_type(L, index);
1154         if (type == LUA_TBOOLEAN) {
1155                 root = (bool) lua_toboolean(L, index);
1156         } else if (type == LUA_TNUMBER) {
1157                 root = lua_tonumber(L, index);
1158         } else if (type == LUA_TSTRING) {
1159                 size_t len;
1160                 const char *str = lua_tolstring(L, index, &len);
1161                 root = std::string(str, len);
1162         } else if (type == LUA_TTABLE) {
1163                 lua_pushnil(L);
1164                 while (lua_next(L, index)) {
1165                         // Key is at -2 and value is at -1
1166                         Json::Value value;
1167                         read_json_value(L, value, lua_gettop(L), recursion + 1);
1168
1169                         Json::ValueType roottype = root.type();
1170                         int keytype = lua_type(L, -1);
1171                         if (keytype == LUA_TNUMBER) {
1172                                 lua_Number key = lua_tonumber(L, -1);
1173                                 if (roottype != Json::nullValue && roottype != Json::arrayValue) {
1174                                         throw SerializationError("Can't mix array and object values in JSON");
1175                                 } else if (key < 1) {
1176                                         throw SerializationError("Can't use zero-based or negative indexes in JSON");
1177                                 } else if (floor(key) != key) {
1178                                         throw SerializationError("Can't use indexes with a fractional part in JSON");
1179                                 }
1180                                 root[(Json::ArrayIndex) key - 1] = value;
1181                         } else if (keytype == LUA_TSTRING) {
1182                                 if (roottype != Json::nullValue && roottype != Json::objectValue) {
1183                                         throw SerializationError("Can't mix array and object values in JSON");
1184                                 }
1185                                 root[lua_tostring(L, -1)] = value;
1186                         } else {
1187                                 throw SerializationError("Lua key to convert to JSON is not a string or number");
1188                         }
1189                 }
1190         } else if (type == LUA_TNIL) {
1191                 root = Json::nullValue;
1192         } else {
1193                 throw SerializationError("Can only store booleans, numbers, strings, objects, arrays, and null in JSON");
1194         }
1195         lua_pop(L, 1); // Pop value
1196 }
1197