src/script/common/c_content.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19 #include "common/c_content.h"
  20 #include "common/c_converter.h"
  21 #include "common/c_types.h"
  22 #include "nodedef.h"
  23 #include "itemdef.h"
  24 #include "object_properties.h"
  25 #include "cpp_api/s_node.h"
  26 #include "lua_api/l_object.h"
  27 #include "lua_api/l_item.h"
  28 #include "common/c_internal.h"
  29 #include "server.h"
  30 #include "log.h"
  31 #include "tool.h"
  32 #include "serverobject.h"
  33 #include "porting.h"
  34 #include "mg_schematic.h"
  35 #include "noise.h"
  36 #include "json/json.h"
  37
  38 struct EnumString es_TileAnimationType[] =
  39 {
  40         {TAT_NONE, "none"},
  41         {TAT_VERTICAL_FRAMES, "vertical_frames"},
  42         {0, NULL},
  43 };
  44
  45 /******************************************************************************/
  46 ItemDefinition read_item_definition(lua_State* L,int index,
  47                 ItemDefinition default_def)
  48 {
  49         if(index < 0)
  50                 index = lua_gettop(L) + 1 + index;
  51
  52         // Read the item definition
  53         ItemDefinition def = default_def;
  54
  55         def.type = (ItemType)getenumfield(L, index, "type",
  56                         es_ItemType, ITEM_NONE);
  57         getstringfield(L, index, "name", def.name);
  58         getstringfield(L, index, "description", def.description);
  59         getstringfield(L, index, "inventory_image", def.inventory_image);
  60         getstringfield(L, index, "wield_image", def.wield_image);
  61
  62         lua_getfield(L, index, "wield_scale");
  63         if(lua_istable(L, -1)){
  64                 def.wield_scale = check_v3f(L, -1);
  65         }
  66         lua_pop(L, 1);
  67
  68         def.stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
  69         if(def.stack_max == 0)
  70                 def.stack_max = 1;
  71
  72         lua_getfield(L, index, "on_use");
  73         def.usable = lua_isfunction(L, -1);
  74         lua_pop(L, 1);
  75
  76         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
  77
  78         warn_if_field_exists(L, index, "tool_digging_properties",
  79                         "deprecated: use tool_capabilities");
  80
  81         lua_getfield(L, index, "tool_capabilities");
  82         if(lua_istable(L, -1)){
  83                 def.tool_capabilities = new ToolCapabilities(
  84                                 read_tool_capabilities(L, -1));
  85         }
  86
  87         // If name is "" (hand), ensure there are ToolCapabilities
  88         // because it will be looked up there whenever any other item has
  89         // no ToolCapabilities
  90         if(def.name == "" && def.tool_capabilities == NULL){
  91                 def.tool_capabilities = new ToolCapabilities();
  92         }
  93
  94         lua_getfield(L, index, "groups");
  95         read_groups(L, -1, def.groups);
  96         lua_pop(L, 1);
  97
  98         lua_getfield(L, index, "sounds");
  99         if(lua_istable(L, -1)){
 100                 lua_getfield(L, -1, "place");
 101                 read_soundspec(L, -1, def.sound_place);
 102                 lua_pop(L, 1);
 103         }
 104         lua_pop(L, 1);
 105
 106         def.range = getfloatfield_default(L, index, "range", def.range);
 107
 108         // Client shall immediately place this node when player places the item.
 109         // Server will update the precise end result a moment later.
 110         // "" = no prediction
 111         getstringfield(L, index, "node_placement_prediction",
 112                         def.node_placement_prediction);
 113
 114         return def;
 115 }
 116
 117 /******************************************************************************/
 118 void read_object_properties(lua_State *L, int index,
 119                 ObjectProperties *prop)
 120 {
 121         if(index < 0)
 122                 index = lua_gettop(L) + 1 + index;
 123         if(!lua_istable(L, index))
 124                 return;
 125
 126         prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
 127
 128         getboolfield(L, -1, "physical", prop->physical);
 129         getboolfield(L, -1, "collide_with_objects", prop->collideWithObjects);
 130
 131         getfloatfield(L, -1, "weight", prop->weight);
 132
 133         lua_getfield(L, -1, "collisionbox");
 134         if(lua_istable(L, -1))
 135                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
 136         lua_pop(L, 1);
 137
 138         getstringfield(L, -1, "visual", prop->visual);
 139
 140         getstringfield(L, -1, "mesh", prop->mesh);
 141
 142         lua_getfield(L, -1, "visual_size");
 143         if(lua_istable(L, -1))
 144                 prop->visual_size = read_v2f(L, -1);
 145         lua_pop(L, 1);
 146
 147         lua_getfield(L, -1, "textures");
 148         if(lua_istable(L, -1)){
 149                 prop->textures.clear();
 150                 int table = lua_gettop(L);
 151                 lua_pushnil(L);
 152                 while(lua_next(L, table) != 0){
 153                         // key at index -2 and value at index -1
 154                         if(lua_isstring(L, -1))
 155                                 prop->textures.push_back(lua_tostring(L, -1));
 156                         else
 157                                 prop->textures.push_back("");
 158                         // removes value, keeps key for next iteration
 159                         lua_pop(L, 1);
 160                 }
 161         }
 162         lua_pop(L, 1);
 163
 164         lua_getfield(L, -1, "colors");
 165         if(lua_istable(L, -1)){
 166                 prop->colors.clear();
 167                 int table = lua_gettop(L);
 168                 lua_pushnil(L);
 169                 while(lua_next(L, table) != 0){
 170                         // key at index -2 and value at index -1
 171                         if(lua_isstring(L, -1))
 172                                 prop->colors.push_back(readARGB8(L, -1));
 173                         else
 174                                 prop->colors.push_back(video::SColor(255, 255, 255, 255));
 175                         // removes value, keeps key for next iteration
 176                         lua_pop(L, 1);
 177                 }
 178         }
 179         lua_pop(L, 1);
 180
 181         lua_getfield(L, -1, "spritediv");
 182         if(lua_istable(L, -1))
 183                 prop->spritediv = read_v2s16(L, -1);
 184         lua_pop(L, 1);
 185
 186         lua_getfield(L, -1, "initial_sprite_basepos");
 187         if(lua_istable(L, -1))
 188                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 189         lua_pop(L, 1);
 190
 191         getboolfield(L, -1, "is_visible", prop->is_visible);
 192         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 193         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 194         if (getfloatfield(L, -1, "stepheight", prop->stepheight))
 195                 prop->stepheight *= BS;
 196         lua_getfield(L, -1, "automatic_face_movement_dir");
 197         if (lua_isnumber(L, -1)) {
 198                 prop->automatic_face_movement_dir = true;
 199                 prop->automatic_face_movement_dir_offset = luaL_checknumber(L, -1);
 200         } else if (lua_isboolean(L, -1)) {
 201                 prop->automatic_face_movement_dir = lua_toboolean(L, -1);
 202                 prop->automatic_face_movement_dir_offset = 0.0;
 203         }
 204         lua_pop(L, 1);
 205 }
 206
 207 /******************************************************************************/
 208 TileDef read_tiledef(lua_State *L, int index)
 209 {
 210         if(index < 0)
 211                 index = lua_gettop(L) + 1 + index;
 212
 213         TileDef tiledef;
 214
 215         // key at index -2 and value at index
 216         if(lua_isstring(L, index)){
 217                 // "default_lava.png"
 218                 tiledef.name = lua_tostring(L, index);
 219         }
 220         else if(lua_istable(L, index))
 221         {
 222                 // {name="default_lava.png", animation={}}
 223                 tiledef.name = "";
 224                 getstringfield(L, index, "name", tiledef.name);
 225                 getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
 226                 tiledef.backface_culling = getboolfield_default(
 227                                         L, index, "backface_culling", true);
 228                 // animation = {}
 229                 lua_getfield(L, index, "animation");
 230                 if(lua_istable(L, -1)){
 231                         // {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
 232                         tiledef.animation.type = (TileAnimationType)
 233                                         getenumfield(L, -1, "type", es_TileAnimationType,
 234                                         TAT_NONE);
 235                         tiledef.animation.aspect_w =
 236                                         getintfield_default(L, -1, "aspect_w", 16);
 237                         tiledef.animation.aspect_h =
 238                                         getintfield_default(L, -1, "aspect_h", 16);
 239                         tiledef.animation.length =
 240                                         getfloatfield_default(L, -1, "length", 1.0);
 241                 }
 242                 lua_pop(L, 1);
 243         }
 244
 245         return tiledef;
 246 }
 247
 248 /******************************************************************************/
 249 ContentFeatures read_content_features(lua_State *L, int index)
 250 {
 251         if(index < 0)
 252                 index = lua_gettop(L) + 1 + index;
 253
 254         ContentFeatures f;
 255
 256         /* Cache existence of some callbacks */
 257         lua_getfield(L, index, "on_construct");
 258         if(!lua_isnil(L, -1)) f.has_on_construct = true;
 259         lua_pop(L, 1);
 260         lua_getfield(L, index, "on_destruct");
 261         if(!lua_isnil(L, -1)) f.has_on_destruct = true;
 262         lua_pop(L, 1);
 263         lua_getfield(L, index, "after_destruct");
 264         if(!lua_isnil(L, -1)) f.has_after_destruct = true;
 265         lua_pop(L, 1);
 266
 267         lua_getfield(L, index, "on_rightclick");
 268         f.rightclickable = lua_isfunction(L, -1);
 269         lua_pop(L, 1);
 270
 271         /* Name */
 272         getstringfield(L, index, "name", f.name);
 273
 274         /* Groups */
 275         lua_getfield(L, index, "groups");
 276         read_groups(L, -1, f.groups);
 277         lua_pop(L, 1);
 278
 279         /* Visual definition */
 280
 281         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype",
 282                         ScriptApiNode::es_DrawType,NDT_NORMAL);
 283         getfloatfield(L, index, "visual_scale", f.visual_scale);
 284
 285         /* Meshnode model filename */
 286         getstringfield(L, index, "mesh", f.mesh);
 287
 288         // tiles = {}
 289         lua_getfield(L, index, "tiles");
 290         // If nil, try the deprecated name "tile_images" instead
 291         if(lua_isnil(L, -1)){
 292                 lua_pop(L, 1);
 293                 warn_if_field_exists(L, index, "tile_images",
 294                                 "Deprecated; new name is \"tiles\".");
 295                 lua_getfield(L, index, "tile_images");
 296         }
 297         if(lua_istable(L, -1)){
 298                 int table = lua_gettop(L);
 299                 lua_pushnil(L);
 300                 int i = 0;
 301                 while(lua_next(L, table) != 0){
 302                         // Read tiledef from value
 303                         f.tiledef[i] = read_tiledef(L, -1);
 304                         // removes value, keeps key for next iteration
 305                         lua_pop(L, 1);
 306                         i++;
 307                         if(i==6){
 308                                 lua_pop(L, 1);
 309                                 break;
 310                         }
 311                 }
 312                 // Copy last value to all remaining textures
 313                 if(i >= 1){
 314                         TileDef lasttile = f.tiledef[i-1];
 315                         while(i < 6){
 316                                 f.tiledef[i] = lasttile;
 317                                 i++;
 318                         }
 319                 }
 320         }
 321         lua_pop(L, 1);
 322
 323         // special_tiles = {}
 324         lua_getfield(L, index, "special_tiles");
 325         // If nil, try the deprecated name "special_materials" instead
 326         if(lua_isnil(L, -1)){
 327                 lua_pop(L, 1);
 328                 warn_if_field_exists(L, index, "special_materials",
 329                                 "Deprecated; new name is \"special_tiles\".");
 330                 lua_getfield(L, index, "special_materials");
 331         }
 332         if(lua_istable(L, -1)){
 333                 int table = lua_gettop(L);
 334                 lua_pushnil(L);
 335                 int i = 0;
 336                 while(lua_next(L, table) != 0){
 337                         // Read tiledef from value
 338                         f.tiledef_special[i] = read_tiledef(L, -1);
 339                         // removes value, keeps key for next iteration
 340                         lua_pop(L, 1);
 341                         i++;
 342                         if(i==CF_SPECIAL_COUNT){
 343                                 lua_pop(L, 1);
 344                                 break;
 345                         }
 346                 }
 347         }
 348         lua_pop(L, 1);
 349
 350         f.alpha = getintfield_default(L, index, "alpha", 255);
 351
 352         bool usealpha = getboolfield_default(L, index,
 353                         "use_texture_alpha", false);
 354         if (usealpha)
 355                 f.alpha = 0;
 356
 357         /* Other stuff */
 358
 359         lua_getfield(L, index, "post_effect_color");
 360         if(!lua_isnil(L, -1))
 361                 f.post_effect_color = readARGB8(L, -1);
 362         lua_pop(L, 1);
 363
 364         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
 365                         ScriptApiNode::es_ContentParamType, CPT_NONE);
 366         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
 367                         ScriptApiNode::es_ContentParamType2, CPT2_NONE);
 368
 369         // Warn about some deprecated fields
 370         warn_if_field_exists(L, index, "wall_mounted",
 371                         "deprecated: use paramtype2 = 'wallmounted'");
 372         warn_if_field_exists(L, index, "light_propagates",
 373                         "deprecated: determined from paramtype");
 374         warn_if_field_exists(L, index, "dug_item",
 375                         "deprecated: use 'drop' field");
 376         warn_if_field_exists(L, index, "extra_dug_item",
 377                         "deprecated: use 'drop' field");
 378         warn_if_field_exists(L, index, "extra_dug_item_rarity",
 379                         "deprecated: use 'drop' field");
 380         warn_if_field_exists(L, index, "metadata_name",
 381                         "deprecated: use on_add and metadata callbacks");
 382
 383         // True for all ground-like things like stone and mud, false for eg. trees
 384         getboolfield(L, index, "is_ground_content", f.is_ground_content);
 385         f.light_propagates = (f.param_type == CPT_LIGHT);
 386         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
 387         // This is used for collision detection.
 388         // Also for general solidness queries.
 389         getboolfield(L, index, "walkable", f.walkable);
 390         // Player can point to these
 391         getboolfield(L, index, "pointable", f.pointable);
 392         // Player can dig these
 393         getboolfield(L, index, "diggable", f.diggable);
 394         // Player can climb these
 395         getboolfield(L, index, "climbable", f.climbable);
 396         // Player can build on these
 397         getboolfield(L, index, "buildable_to", f.buildable_to);
 398         // Whether the node is non-liquid, source liquid or flowing liquid
 399         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
 400                         ScriptApiNode::es_LiquidType, LIQUID_NONE);
 401         // If the content is liquid, this is the flowing version of the liquid.
 402         getstringfield(L, index, "liquid_alternative_flowing",
 403                         f.liquid_alternative_flowing);
 404         // If the content is liquid, this is the source version of the liquid.
 405         getstringfield(L, index, "liquid_alternative_source",
 406                         f.liquid_alternative_source);
 407         // Viscosity for fluid flow, ranging from 1 to 7, with
 408         // 1 giving almost instantaneous propagation and 7 being
 409         // the slowest possible
 410         f.liquid_viscosity = getintfield_default(L, index,
 411                         "liquid_viscosity", f.liquid_viscosity);
 412         f.liquid_range = getintfield_default(L, index,
 413                         "liquid_range", f.liquid_range);
 414         f.leveled = getintfield_default(L, index, "leveled", f.leveled);
 415
 416         getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
 417         getstringfield(L, index, "freezemelt", f.freezemelt);
 418         f.drowning = getintfield_default(L, index,
 419                         "drowning", f.drowning);
 420         // Amount of light the node emits
 421         f.light_source = getintfield_default(L, index,
 422                         "light_source", f.light_source);
 423         f.damage_per_second = getintfield_default(L, index,
 424                         "damage_per_second", f.damage_per_second);
 425
 426         lua_getfield(L, index, "node_box");
 427         if(lua_istable(L, -1))
 428                 f.node_box = read_nodebox(L, -1);
 429         lua_pop(L, 1);
 430
 431         lua_getfield(L, index, "selection_box");
 432         if(lua_istable(L, -1))
 433                 f.selection_box = read_nodebox(L, -1);
 434         lua_pop(L, 1);
 435
 436         lua_getfield(L, index, "collision_box");
 437         if(lua_istable(L, -1))
 438                 f.collision_box = read_nodebox(L, -1);
 439         lua_pop(L, 1);
 440
 441         f.waving = getintfield_default(L, index,
 442                         "waving", f.waving);
 443
 444         // Set to true if paramtype used to be 'facedir_simple'
 445         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
 446         // Set to true if wall_mounted used to be set to true
 447         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
 448
 449         // Sound table
 450         lua_getfield(L, index, "sounds");
 451         if(lua_istable(L, -1)){
 452                 lua_getfield(L, -1, "footstep");
 453                 read_soundspec(L, -1, f.sound_footstep);
 454                 lua_pop(L, 1);
 455                 lua_getfield(L, -1, "dig");
 456                 read_soundspec(L, -1, f.sound_dig);
 457                 lua_pop(L, 1);
 458                 lua_getfield(L, -1, "dug");
 459                 read_soundspec(L, -1, f.sound_dug);
 460                 lua_pop(L, 1);
 461         }
 462         lua_pop(L, 1);
 463
 464         return f;
 465 }
 466
 467 /******************************************************************************/
 468 void read_server_sound_params(lua_State *L, int index,
 469                 ServerSoundParams &params)
 470 {
 471         if(index < 0)
 472                 index = lua_gettop(L) + 1 + index;
 473         // Clear
 474         params = ServerSoundParams();
 475         if(lua_istable(L, index)){
 476                 getfloatfield(L, index, "gain", params.gain);
 477                 getstringfield(L, index, "to_player", params.to_player);
 478                 lua_getfield(L, index, "pos");
 479                 if(!lua_isnil(L, -1)){
 480                         v3f p = read_v3f(L, -1)*BS;
 481                         params.pos = p;
 482                         params.type = ServerSoundParams::SSP_POSITIONAL;
 483                 }
 484                 lua_pop(L, 1);
 485                 lua_getfield(L, index, "object");
 486                 if(!lua_isnil(L, -1)){
 487                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
 488                         ServerActiveObject *sao = ObjectRef::getobject(ref);
 489                         if(sao){
 490                                 params.object = sao->getId();
 491                                 params.type = ServerSoundParams::SSP_OBJECT;
 492                         }
 493                 }
 494                 lua_pop(L, 1);
 495                 params.max_hear_distance = BS*getfloatfield_default(L, index,
 496                                 "max_hear_distance", params.max_hear_distance/BS);
 497                 getboolfield(L, index, "loop", params.loop);
 498         }
 499 }
 500
 501 /******************************************************************************/
 502 void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
 503 {
 504         if(index < 0)
 505                 index = lua_gettop(L) + 1 + index;
 506         if(lua_isnil(L, index)){
 507         } else if(lua_istable(L, index)){
 508                 getstringfield(L, index, "name", spec.name);
 509                 getfloatfield(L, index, "gain", spec.gain);
 510         } else if(lua_isstring(L, index)){
 511                 spec.name = lua_tostring(L, index);
 512         }
 513 }
 514
 515 /******************************************************************************/
 516 NodeBox read_nodebox(lua_State *L, int index)
 517 {
 518         NodeBox nodebox;
 519         if(lua_istable(L, -1)){
 520                 nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
 521                                 ScriptApiNode::es_NodeBoxType, NODEBOX_REGULAR);
 522
 523                 lua_getfield(L, index, "fixed");
 524                 if(lua_istable(L, -1))
 525                         nodebox.fixed = read_aabb3f_vector(L, -1, BS);
 526                 lua_pop(L, 1);
 527
 528                 lua_getfield(L, index, "wall_top");
 529                 if(lua_istable(L, -1))
 530                         nodebox.wall_top = read_aabb3f(L, -1, BS);
 531                 lua_pop(L, 1);
 532
 533                 lua_getfield(L, index, "wall_bottom");
 534                 if(lua_istable(L, -1))
 535                         nodebox.wall_bottom = read_aabb3f(L, -1, BS);
 536                 lua_pop(L, 1);
 537
 538                 lua_getfield(L, index, "wall_side");
 539                 if(lua_istable(L, -1))
 540                         nodebox.wall_side = read_aabb3f(L, -1, BS);
 541                 lua_pop(L, 1);
 542         }
 543         return nodebox;
 544 }
 545
 546 /******************************************************************************/
 547 MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
 548 {
 549         lua_getfield(L, index, "name");
 550         const char *name = luaL_checkstring(L, -1);
 551         lua_pop(L, 1);
 552         u8 param1;
 553         lua_getfield(L, index, "param1");
 554         if(lua_isnil(L, -1))
 555                 param1 = 0;
 556         else
 557                 param1 = lua_tonumber(L, -1);
 558         lua_pop(L, 1);
 559         u8 param2;
 560         lua_getfield(L, index, "param2");
 561         if(lua_isnil(L, -1))
 562                 param2 = 0;
 563         else
 564                 param2 = lua_tonumber(L, -1);
 565         lua_pop(L, 1);
 566         return MapNode(ndef, name, param1, param2);
 567 }
 568
 569 /******************************************************************************/
 570 void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
 571 {
 572         lua_newtable(L);
 573         lua_pushstring(L, ndef->get(n).name.c_str());
 574         lua_setfield(L, -2, "name");
 575         lua_pushnumber(L, n.getParam1());
 576         lua_setfield(L, -2, "param1");
 577         lua_pushnumber(L, n.getParam2());
 578         lua_setfield(L, -2, "param2");
 579 }
 580
 581 /******************************************************************************/
 582 void warn_if_field_exists(lua_State *L, int table,
 583                 const char *fieldname, const std::string &message)
 584 {
 585         lua_getfield(L, table, fieldname);
 586         if(!lua_isnil(L, -1)){
 587 //TODO find way to access backtrace fct from here
 588                 //              infostream<<script_get_backtrace(L)<<std::endl;
 589                 infostream<<"WARNING: field \""<<fieldname<<"\": "
 590                                 <<message<<std::endl;
 591         }
 592         lua_pop(L, 1);
 593 }
 594
 595 /******************************************************************************/
 596 int getenumfield(lua_State *L, int table,
 597                 const char *fieldname, const EnumString *spec, int default_)
 598 {
 599         int result = default_;
 600         string_to_enum(spec, result,
 601                         getstringfield_default(L, table, fieldname, ""));
 602         return result;
 603 }
 604
 605 /******************************************************************************/
 606 bool string_to_enum(const EnumString *spec, int &result,
 607                 const std::string &str)
 608 {
 609         const EnumString *esp = spec;
 610         while(esp->str){
 611                 if(str == std::string(esp->str)){
 612                         result = esp->num;
 613                         return true;
 614                 }
 615                 esp++;
 616         }
 617         return false;
 618 }
 619
 620 /******************************************************************************/
 621 ItemStack read_item(lua_State* L, int index,Server* srv)
 622 {
 623         if(index < 0)
 624                 index = lua_gettop(L) + 1 + index;
 625
 626         if(lua_isnil(L, index))
 627         {
 628                 return ItemStack();
 629         }
 630         else if(lua_isuserdata(L, index))
 631         {
 632                 // Convert from LuaItemStack
 633                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
 634                 return o->getItem();
 635         }
 636         else if(lua_isstring(L, index))
 637         {
 638                 // Convert from itemstring
 639                 std::string itemstring = lua_tostring(L, index);
 640                 IItemDefManager *idef = srv->idef();
 641                 try
 642                 {
 643                         ItemStack item;
 644                         item.deSerialize(itemstring, idef);
 645                         return item;
 646                 }
 647                 catch(SerializationError &e)
 648                 {
 649                         infostream<<"WARNING: unable to create item from itemstring"
 650                                         <<": "<<itemstring<<std::endl;
 651                         return ItemStack();
 652                 }
 653         }
 654         else if(lua_istable(L, index))
 655         {
 656                 // Convert from table
 657                 IItemDefManager *idef = srv->idef();
 658                 std::string name = getstringfield_default(L, index, "name", "");
 659                 int count = getintfield_default(L, index, "count", 1);
 660                 int wear = getintfield_default(L, index, "wear", 0);
 661                 std::string metadata = getstringfield_default(L, index, "metadata", "");
 662                 return ItemStack(name, count, wear, metadata, idef);
 663         }
 664         else
 665         {
 666                 throw LuaError("Expecting itemstack, itemstring, table or nil");
 667         }
 668 }
 669
 670 /******************************************************************************/
 671 void push_tool_capabilities(lua_State *L,
 672                 const ToolCapabilities &toolcap)
 673 {
 674         lua_newtable(L);
 675         setfloatfield(L, -1, "full_punch_interval", toolcap.full_punch_interval);
 676                 setintfield(L, -1, "max_drop_level", toolcap.max_drop_level);
 677                 // Create groupcaps table
 678                 lua_newtable(L);
 679                 // For each groupcap
 680                 for(std::map<std::string, ToolGroupCap>::const_iterator
 681                                 i = toolcap.groupcaps.begin(); i != toolcap.groupcaps.end(); i++){
 682                         // Create groupcap table
 683                         lua_newtable(L);
 684                         const std::string &name = i->first;
 685                         const ToolGroupCap &groupcap = i->second;
 686                         // Create subtable "times"
 687                         lua_newtable(L);
 688                         for(std::map<int, float>::const_iterator
 689                                         i = groupcap.times.begin(); i != groupcap.times.end(); i++){
 690                                 int rating = i->first;
 691                                 float time = i->second;
 692                                 lua_pushinteger(L, rating);
 693                                 lua_pushnumber(L, time);
 694                                 lua_settable(L, -3);
 695                         }
 696                         // Set subtable "times"
 697                         lua_setfield(L, -2, "times");
 698                         // Set simple parameters
 699                         setintfield(L, -1, "maxlevel", groupcap.maxlevel);
 700                         setintfield(L, -1, "uses", groupcap.uses);
 701                         // Insert groupcap table into groupcaps table
 702                         lua_setfield(L, -2, name.c_str());
 703                 }
 704                 // Set groupcaps table
 705                 lua_setfield(L, -2, "groupcaps");
 706                 //Create damage_groups table
 707                 lua_newtable(L);
 708                 // For each damage group
 709                 for(std::map<std::string, s16>::const_iterator
 710                                 i = toolcap.damageGroups.begin(); i != toolcap.damageGroups.end(); i++){
 711                         // Create damage group table
 712                         lua_pushinteger(L, i->second);
 713                         lua_setfield(L, -2, i->first.c_str());
 714                 }
 715                 lua_setfield(L, -2, "damage_groups");
 716 }
 717
 718 /******************************************************************************/
 719 void push_inventory_list(lua_State *L, Inventory *inv, const char *name)
 720 {
 721         InventoryList *invlist = inv->getList(name);
 722         if(invlist == NULL){
 723                 lua_pushnil(L);
 724                 return;
 725         }
 726         std::vector<ItemStack> items;
 727         for(u32 i=0; i<invlist->getSize(); i++)
 728                 items.push_back(invlist->getItem(i));
 729         push_items(L, items);
 730 }
 731
 732 /******************************************************************************/
 733 void read_inventory_list(lua_State *L, int tableindex,
 734                 Inventory *inv, const char *name, Server* srv, int forcesize)
 735 {
 736         if(tableindex < 0)
 737                 tableindex = lua_gettop(L) + 1 + tableindex;
 738         // If nil, delete list
 739         if(lua_isnil(L, tableindex)){
 740                 inv->deleteList(name);
 741                 return;
 742         }
 743         // Otherwise set list
 744         std::vector<ItemStack> items = read_items(L, tableindex,srv);
 745         int listsize = (forcesize != -1) ? forcesize : items.size();
 746         InventoryList *invlist = inv->addList(name, listsize);
 747         int index = 0;
 748         for(std::vector<ItemStack>::const_iterator
 749                         i = items.begin(); i != items.end(); i++){
 750                 if(forcesize != -1 && index == forcesize)
 751                         break;
 752                 invlist->changeItem(index, *i);
 753                 index++;
 754         }
 755         while(forcesize != -1 && index < forcesize){
 756                 invlist->deleteItem(index);
 757                 index++;
 758         }
 759 }
 760
 761 /******************************************************************************/
 762 ToolCapabilities read_tool_capabilities(
 763                 lua_State *L, int table)
 764 {
 765         ToolCapabilities toolcap;
 766         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
 767         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
 768         lua_getfield(L, table, "groupcaps");
 769         if(lua_istable(L, -1)){
 770                 int table_groupcaps = lua_gettop(L);
 771                 lua_pushnil(L);
 772                 while(lua_next(L, table_groupcaps) != 0){
 773                         // key at index -2 and value at index -1
 774                         std::string groupname = luaL_checkstring(L, -2);
 775                         if(lua_istable(L, -1)){
 776                                 int table_groupcap = lua_gettop(L);
 777                                 // This will be created
 778                                 ToolGroupCap groupcap;
 779                                 // Read simple parameters
 780                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
 781                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
 782                                 // DEPRECATED: maxwear
 783                                 float maxwear = 0;
 784                                 if(getfloatfield(L, table_groupcap, "maxwear", maxwear)){
 785                                         if(maxwear != 0)
 786                                                 groupcap.uses = 1.0/maxwear;
 787                                         else
 788                                                 groupcap.uses = 0;
 789                                         infostream<<script_get_backtrace(L)<<std::endl;
 790                                         infostream<<"WARNING: field \"maxwear\" is deprecated; "
 791                                                         <<"should replace with uses=1/maxwear"<<std::endl;
 792                                 }
 793                                 // Read "times" table
 794                                 lua_getfield(L, table_groupcap, "times");
 795                                 if(lua_istable(L, -1)){
 796                                         int table_times = lua_gettop(L);
 797                                         lua_pushnil(L);
 798                                         while(lua_next(L, table_times) != 0){
 799                                                 // key at index -2 and value at index -1
 800                                                 int rating = luaL_checkinteger(L, -2);
 801                                                 float time = luaL_checknumber(L, -1);
 802                                                 groupcap.times[rating] = time;
 803                                                 // removes value, keeps key for next iteration
 804                                                 lua_pop(L, 1);
 805                                         }
 806                                 }
 807                                 lua_pop(L, 1);
 808                                 // Insert groupcap into toolcap
 809                                 toolcap.groupcaps[groupname] = groupcap;
 810                         }
 811                         // removes value, keeps key for next iteration
 812                         lua_pop(L, 1);
 813                 }
 814         }
 815         lua_pop(L, 1);
 816
 817         lua_getfield(L, table, "damage_groups");
 818         if(lua_istable(L, -1)){
 819                 int table_damage_groups = lua_gettop(L);
 820                 lua_pushnil(L);
 821                 while(lua_next(L, table_damage_groups) != 0){
 822                         // key at index -2 and value at index -1
 823                         std::string groupname = luaL_checkstring(L, -2);
 824                         u16 value = luaL_checkinteger(L, -1);
 825                         toolcap.damageGroups[groupname] = value;
 826                         // removes value, keeps key for next iteration
 827                         lua_pop(L, 1);
 828                 }
 829         }
 830         lua_pop(L, 1);
 831         return toolcap;
 832 }
 833
 834 /******************************************************************************/
 835 void push_dig_params(lua_State *L,const DigParams &params)
 836 {
 837         lua_newtable(L);
 838         setboolfield(L, -1, "diggable", params.diggable);
 839         setfloatfield(L, -1, "time", params.time);
 840         setintfield(L, -1, "wear", params.wear);
 841 }
 842
 843 /******************************************************************************/
 844 void push_hit_params(lua_State *L,const HitParams &params)
 845 {
 846         lua_newtable(L);
 847         setintfield(L, -1, "hp", params.hp);
 848         setintfield(L, -1, "wear", params.wear);
 849 }
 850
 851 /******************************************************************************/
 852
 853 bool getflagsfield(lua_State *L, int table, const char *fieldname,
 854         FlagDesc *flagdesc, u32 *flags, u32 *flagmask)
 855 {
 856         lua_getfield(L, table, fieldname);
 857
 858         bool success = read_flags(L, -1, flagdesc, flags, flagmask);
 859
 860         lua_pop(L, 1);
 861
 862         return success;
 863 }
 864
 865 bool read_flags(lua_State *L, int index, FlagDesc *flagdesc,
 866         u32 *flags, u32 *flagmask)
 867 {
 868         if (lua_isstring(L, index)) {
 869                 std::string flagstr = lua_tostring(L, index);
 870                 *flags = readFlagString(flagstr, flagdesc, flagmask);
 871         } else if (lua_istable(L, index)) {
 872                 *flags = read_flags_table(L, index, flagdesc, flagmask);
 873         } else {
 874                 return false;
 875         }
 876
 877         return true;
 878 }
 879
 880 u32 read_flags_table(lua_State *L, int table, FlagDesc *flagdesc, u32 *flagmask)
 881 {
 882         u32 flags = 0, mask = 0;
 883         char fnamebuf[64] = "no";
 884
 885         for (int i = 0; flagdesc[i].name; i++) {
 886                 bool result;
 887
 888                 if (getboolfield(L, table, flagdesc[i].name, result)) {
 889                         mask |= flagdesc[i].flag;
 890                         if (result)
 891                                 flags |= flagdesc[i].flag;
 892                 }
 893
 894                 strlcpy(fnamebuf + 2, flagdesc[i].name, sizeof(fnamebuf) - 2);
 895                 if (getboolfield(L, table, fnamebuf, result))
 896                         mask |= flagdesc[i].flag;
 897         }
 898
 899         if (flagmask)
 900                 *flagmask = mask;
 901
 902         return flags;
 903 }
 904
 905 /******************************************************************************/
 906 /* Lua Stored data!                                                           */
 907 /******************************************************************************/
 908
 909 /******************************************************************************/
 910 void read_groups(lua_State *L, int index,
 911                 std::map<std::string, int> &result)
 912 {
 913         if (!lua_istable(L,index))
 914                 return;
 915         result.clear();
 916         lua_pushnil(L);
 917         if(index < 0)
 918                 index -= 1;
 919         while(lua_next(L, index) != 0){
 920                 // key at index -2 and value at index -1
 921                 std::string name = luaL_checkstring(L, -2);
 922                 int rating = luaL_checkinteger(L, -1);
 923                 result[name] = rating;
 924                 // removes value, keeps key for next iteration
 925                 lua_pop(L, 1);
 926         }
 927 }
 928
 929 /******************************************************************************/
 930 void push_items(lua_State *L, const std::vector<ItemStack> &items)
 931 {
 932         // Create and fill table
 933         lua_createtable(L, items.size(), 0);
 934         std::vector<ItemStack>::const_iterator iter = items.begin();
 935         for (u32 i = 0; iter != items.end(); iter++) {
 936                 LuaItemStack::create(L, *iter);
 937                 lua_rawseti(L, -2, ++i);
 938         }
 939 }
 940
 941 /******************************************************************************/
 942 std::vector<ItemStack> read_items(lua_State *L, int index, Server *srv)
 943 {
 944         if(index < 0)
 945                 index = lua_gettop(L) + 1 + index;
 946
 947         std::vector<ItemStack> items;
 948         luaL_checktype(L, index, LUA_TTABLE);
 949         lua_pushnil(L);
 950         while (lua_next(L, index)) {
 951                 s32 key = luaL_checkinteger(L, -2);
 952                 if (key < 1) {
 953                         throw LuaError("Invalid inventory list index");
 954                 }
 955                 if (items.size() < (u32) key) {
 956                         items.resize(key);
 957                 }
 958                 items[key - 1] = read_item(L, -1, srv);
 959                 lua_pop(L, 1);
 960         }
 961         return items;
 962 }
 963
 964 /******************************************************************************/
 965 void luaentity_get(lua_State *L, u16 id)
 966 {
 967         // Get luaentities[i]
 968         lua_getglobal(L, "core");
 969         lua_getfield(L, -1, "luaentities");
 970         luaL_checktype(L, -1, LUA_TTABLE);
 971         lua_pushnumber(L, id);
 972         lua_gettable(L, -2);
 973         lua_remove(L, -2); // Remove luaentities
 974         lua_remove(L, -2); // Remove core
 975 }
 976
 977 /******************************************************************************/
 978 NoiseParams *read_noiseparams(lua_State *L, int index)
 979 {
 980         NoiseParams *np = new NoiseParams;
 981
 982         if (!read_noiseparams_nc(L, index, np)) {
 983                 delete np;
 984                 np = NULL;
 985         }
 986
 987         return np;
 988 }
 989
 990 bool read_noiseparams_nc(lua_State *L, int index, NoiseParams *np)
 991 {
 992         if (index < 0)
 993                 index = lua_gettop(L) + 1 + index;
 994
 995         if (!lua_istable(L, index))
 996                 return false;
 997
 998         np->offset  = getfloatfield_default(L, index, "offset",  0.0);
 999         np->scale   = getfloatfield_default(L, index, "scale",   0.0);
1000         np->persist = getfloatfield_default(L, index, "persist", 0.0);
1001         np->seed    = getintfield_default(L,   index, "seed",    0);
1002         np->octaves = getintfield_default(L,   index, "octaves", 0);
1003         np->eased   = getboolfield_default(L,  index, "eased",   false);
1004
1005         lua_getfield(L, index, "spread");
1006         np->spread  = read_v3f(L, -1);
1007         lua_pop(L, 1);
1008
1009         return true;
1010 }
1011
1012 /******************************************************************************/
1013
1014 bool get_schematic(lua_State *L, int index, Schematic *schem,
1015         INodeDefManager *ndef, std::map<std::string, std::string> &replace_names)
1016 {
1017         if (index < 0)
1018                 index = lua_gettop(L) + 1 + index;
1019
1020         if (lua_istable(L, index)) {
1021                 return read_schematic(L, index, schem, ndef, replace_names);
1022         } else if (lua_isstring(L, index)) {
1023                 NodeResolver *resolver = ndef->getResolver();
1024                 const char *filename = lua_tostring(L, index);
1025                 return schem->loadSchematicFromFile(filename, resolver, replace_names);
1026         } else {
1027                 return false;
1028         }
1029 }
1030
1031 bool read_schematic(lua_State *L, int index, Schematic *schem,
1032         INodeDefManager *ndef, std::map<std::string, std::string> &replace_names)
1033 {
1034         //// Get schematic size
1035         lua_getfield(L, index, "size");
1036         v3s16 size = read_v3s16(L, -1);
1037         lua_pop(L, 1);
1038
1039         //// Get schematic data
1040         lua_getfield(L, index, "data");
1041         luaL_checktype(L, -1, LUA_TTABLE);
1042
1043         int numnodes = size.X * size.Y * size.Z;
1044         MapNode *schemdata = new MapNode[numnodes];
1045         int i = 0;
1046
1047         lua_pushnil(L);
1048         while (lua_next(L, -2)) {
1049                 if (i < numnodes) {
1050                         // same as readnode, except param1 default is MTSCHEM_PROB_CONST
1051                         lua_getfield(L, -1, "name");
1052                         std::string name = luaL_checkstring(L, -1);
1053                         lua_pop(L, 1);
1054
1055                         u8 param1;
1056                         lua_getfield(L, -1, "param1");
1057                         param1 = !lua_isnil(L, -1) ? lua_tonumber(L, -1) : MTSCHEM_PROB_ALWAYS;
1058                         lua_pop(L, 1);
1059
1060                         u8 param2;
1061                         lua_getfield(L, -1, "param2");
1062                         param2 = !lua_isnil(L, -1) ? lua_tonumber(L, -1) : 0;
1063                         lua_pop(L, 1);
1064
1065                         std::map<std::string, std::string>::iterator it;
1066                         it = replace_names.find(name);
1067                         if (it != replace_names.end())
1068                                 name = it->second;
1069
1070                         schemdata[i] = MapNode(ndef, name, param1, param2);
1071                 }
1072
1073                 i++;
1074                 lua_pop(L, 1);
1075         }
1076
1077         if (i != numnodes) {
1078                 errorstream << "read_schematic: incorrect number of "
1079                         "nodes provided in raw schematic data (got " << i <<
1080                         ", expected " << numnodes << ")." << std::endl;
1081                 return false;
1082         }
1083
1084         //// Get Y-slice probability values (if present)
1085         u8 *slice_probs = new u8[size.Y];
1086         for (i = 0; i != size.Y; i++)
1087                 slice_probs[i] = MTSCHEM_PROB_ALWAYS;
1088
1089         lua_getfield(L, index, "yslice_prob");
1090         if (lua_istable(L, -1)) {
1091                 lua_pushnil(L);
1092                 while (lua_next(L, -2)) {
1093                         if (getintfield(L, -1, "ypos", i) && i >= 0 && i < size.Y) {
1094                                 slice_probs[i] = getintfield_default(L, -1,
1095                                         "prob", MTSCHEM_PROB_ALWAYS);
1096                         }
1097                         lua_pop(L, 1);
1098                 }
1099         }
1100
1101         // Here, we read the nodes directly from the INodeDefManager - there is no
1102         // need for pending node resolutions so we'll mark this schematic as updated
1103         schem->flags       = SCHEM_CIDS_UPDATED;
1104
1105         schem->size        = size;
1106         schem->schemdata   = schemdata;
1107         schem->slice_probs = slice_probs;
1108         return true;
1109 }
1110
1111 /******************************************************************************/
1112 // Returns depth of json value tree
1113 static int push_json_value_getdepth(const Json::Value &value)
1114 {
1115         if (!value.isArray() && !value.isObject())
1116                 return 1;
1117
1118         int maxdepth = 0;
1119         for (Json::Value::const_iterator it = value.begin();
1120                         it != value.end(); ++it) {
1121                 int elemdepth = push_json_value_getdepth(*it);
1122                 if (elemdepth > maxdepth)
1123                         maxdepth = elemdepth;
1124         }
1125         return maxdepth + 1;
1126 }
1127 // Recursive function to convert JSON --> Lua table
1128 static bool push_json_value_helper(lua_State *L, const Json::Value &value,
1129                 int nullindex)
1130 {
1131         switch(value.type()) {
1132                 case Json::nullValue:
1133                 default:
1134                         lua_pushvalue(L, nullindex);
1135                         break;
1136                 case Json::intValue:
1137                         lua_pushinteger(L, value.asInt());
1138                         break;
1139                 case Json::uintValue:
1140                         lua_pushinteger(L, value.asUInt());
1141                         break;
1142                 case Json::realValue:
1143                         lua_pushnumber(L, value.asDouble());
1144                         break;
1145                 case Json::stringValue:
1146                         {
1147                                 const char *str = value.asCString();
1148                                 lua_pushstring(L, str ? str : "");
1149                         }
1150                         break;
1151                 case Json::booleanValue:
1152                         lua_pushboolean(L, value.asInt());
1153                         break;
1154                 case Json::arrayValue:
1155                         lua_newtable(L);
1156                         for (Json::Value::const_iterator it = value.begin();
1157                                         it != value.end(); ++it) {
1158                                 push_json_value_helper(L, *it, nullindex);
1159                                 lua_rawseti(L, -2, it.index() + 1);
1160                         }
1161                         break;
1162                 case Json::objectValue:
1163                         lua_newtable(L);
1164                         for (Json::Value::const_iterator it = value.begin();
1165                                         it != value.end(); ++it) {
1166                                 const char *str = it.memberName();
1167                                 lua_pushstring(L, str ? str : "");
1168                                 push_json_value_helper(L, *it, nullindex);
1169                                 lua_rawset(L, -3);
1170                         }
1171                         break;
1172         }
1173         return true;
1174 }
1175 // converts JSON --> Lua table; returns false if lua stack limit exceeded
1176 // nullindex: Lua stack index of value to use in place of JSON null
1177 bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
1178 {
1179         if(nullindex < 0)
1180                 nullindex = lua_gettop(L) + 1 + nullindex;
1181
1182         int depth = push_json_value_getdepth(value);
1183
1184         // The maximum number of Lua stack slots used at each recursion level
1185         // of push_json_value_helper is 2, so make sure there a depth * 2 slots
1186         if (lua_checkstack(L, depth * 2))
1187                 return push_json_value_helper(L, value, nullindex);
1188         else
1189                 return false;
1190 }
1191
1192 // Converts Lua table --> JSON
1193 void read_json_value(lua_State *L, Json::Value &root, int index, u8 recursion)
1194 {
1195         if (recursion > 16) {
1196                 throw SerializationError("Maximum recursion depth exceeded");
1197         }
1198         int type = lua_type(L, index);
1199         if (type == LUA_TBOOLEAN) {
1200                 root = (bool) lua_toboolean(L, index);
1201         } else if (type == LUA_TNUMBER) {
1202                 root = lua_tonumber(L, index);
1203         } else if (type == LUA_TSTRING) {
1204                 size_t len;
1205                 const char *str = lua_tolstring(L, index, &len);
1206                 root = std::string(str, len);
1207         } else if (type == LUA_TTABLE) {
1208                 lua_pushnil(L);
1209                 while (lua_next(L, index)) {
1210                         // Key is at -2 and value is at -1
1211                         Json::Value value;
1212                         read_json_value(L, value, lua_gettop(L), recursion + 1);
1213
1214                         Json::ValueType roottype = root.type();
1215                         int keytype = lua_type(L, -1);
1216                         if (keytype == LUA_TNUMBER) {
1217                                 lua_Number key = lua_tonumber(L, -1);
1218                                 if (roottype != Json::nullValue && roottype != Json::arrayValue) {
1219                                         throw SerializationError("Can't mix array and object values in JSON");
1220                                 } else if (key < 1) {
1221                                         throw SerializationError("Can't use zero-based or negative indexes in JSON");
1222                                 } else if (floor(key) != key) {
1223                                         throw SerializationError("Can't use indexes with a fractional part in JSON");
1224                                 }
1225                                 root[(Json::ArrayIndex) key - 1] = value;
1226                         } else if (keytype == LUA_TSTRING) {
1227                                 if (roottype != Json::nullValue && roottype != Json::objectValue) {
1228                                         throw SerializationError("Can't mix array and object values in JSON");
1229                                 }
1230                                 root[lua_tostring(L, -1)] = value;
1231                         } else {
1232                                 throw SerializationError("Lua key to convert to JSON is not a string or number");
1233                         }
1234                 }
1235         } else if (type == LUA_TNIL) {
1236                 root = Json::nullValue;
1237         } else {
1238                 throw SerializationError("Can only store booleans, numbers, strings, objects, arrays, and null in JSON");
1239         }
1240         lua_pop(L, 1); // Pop value
1241 }
1242