builtin/game/item.lua

   1 -- Minetest: builtin/item.lua
   2
   3 local function copy_pointed_thing(pointed_thing)
   4         return {
   5                 type  = pointed_thing.type,
   6                 above = vector.new(pointed_thing.above),
   7                 under = vector.new(pointed_thing.under),
   8                 ref   = pointed_thing.ref,
   9         }
  10 end
  11
  12 --
  13 -- Item definition helpers
  14 --
  15
  16 function core.inventorycube(img1, img2, img3)
  17         img2 = img2 or img1
  18         img3 = img3 or img1
  19         return "[inventorycube"
  20                         .. "{" .. img1:gsub("%^", "&")
  21                         .. "{" .. img2:gsub("%^", "&")
  22                         .. "{" .. img3:gsub("%^", "&")
  23 end
  24
  25 function core.get_pointed_thing_position(pointed_thing, above)
  26         if pointed_thing.type == "node" then
  27                 if above then
  28                         -- The position where a node would be placed
  29                         return pointed_thing.above
  30                 else
  31                         -- The position where a node would be dug
  32                         return pointed_thing.under
  33                 end
  34         elseif pointed_thing.type == "object" then
  35                 obj = pointed_thing.ref
  36                 if obj ~= nil then
  37                         return obj:getpos()
  38                 else
  39                         return nil
  40                 end
  41         else
  42                 return nil
  43         end
  44 end
  45
  46 function core.dir_to_facedir(dir, is6d)
  47         --account for y if requested
  48         if is6d and math.abs(dir.y) > math.abs(dir.x) and math.abs(dir.y) > math.abs(dir.z) then
  49
  50                 --from above
  51                 if dir.y < 0 then
  52                         if math.abs(dir.x) > math.abs(dir.z) then
  53                                 if dir.x < 0 then
  54                                         return 19
  55                                 else
  56                                         return 13
  57                                 end
  58                         else
  59                                 if dir.z < 0 then
  60                                         return 10
  61                                 else
  62                                         return 4
  63                                 end
  64                         end
  65
  66                 --from below
  67                 else
  68                         if math.abs(dir.x) > math.abs(dir.z) then
  69                                 if dir.x < 0 then
  70                                         return 15
  71                                 else
  72                                         return 17
  73                                 end
  74                         else
  75                                 if dir.z < 0 then
  76                                         return 6
  77                                 else
  78                                         return 8
  79                                 end
  80                         end
  81                 end
  82
  83         --otherwise, place horizontally
  84         elseif math.abs(dir.x) > math.abs(dir.z) then
  85                 if dir.x < 0 then
  86                         return 3
  87                 else
  88                         return 1
  89                 end
  90         else
  91                 if dir.z < 0 then
  92                         return 2
  93                 else
  94                         return 0
  95                 end
  96         end
  97 end
  98
  99 function core.facedir_to_dir(facedir)
 100         --a table of possible dirs
 101         return ({{x=0, y=0, z=1},
 102                                         {x=1, y=0, z=0},
 103                                         {x=0, y=0, z=-1},
 104                                         {x=-1, y=0, z=0},
 105                                         {x=0, y=-1, z=0},
 106                                         {x=0, y=1, z=0}})
 107
 108                                         --indexed into by a table of correlating facedirs
 109                                         [({[0]=1, 2, 3, 4,
 110                                                 5, 2, 6, 4,
 111                                                 6, 2, 5, 4,
 112                                                 1, 5, 3, 6,
 113                                                 1, 6, 3, 5,
 114                                                 1, 4, 3, 2})
 115
 116                                                 --indexed into by the facedir in question
 117                                                 [facedir]]
 118 end
 119
 120 function core.dir_to_wallmounted(dir)
 121         if math.abs(dir.y) > math.max(math.abs(dir.x), math.abs(dir.z)) then
 122                 if dir.y < 0 then
 123                         return 1
 124                 else
 125                         return 0
 126                 end
 127         elseif math.abs(dir.x) > math.abs(dir.z) then
 128                 if dir.x < 0 then
 129                         return 3
 130                 else
 131                         return 2
 132                 end
 133         else
 134                 if dir.z < 0 then
 135                         return 5
 136                 else
 137                         return 4
 138                 end
 139         end
 140 end
 141
 142 function core.get_node_drops(nodename, toolname)
 143         local drop = ItemStack({name=nodename}):get_definition().drop
 144         if drop == nil then
 145                 -- default drop
 146                 return {nodename}
 147         elseif type(drop) == "string" then
 148                 -- itemstring drop
 149                 return {drop}
 150         elseif drop.items == nil then
 151                 -- drop = {} to disable default drop
 152                 return {}
 153         end
 154
 155         -- Extended drop table
 156         local got_items = {}
 157         local got_count = 0
 158         local _, item, tool
 159         for _, item in ipairs(drop.items) do
 160                 local good_rarity = true
 161                 local good_tool = true
 162                 if item.rarity ~= nil then
 163                         good_rarity = item.rarity < 1 or math.random(item.rarity) == 1
 164                 end
 165                 if item.tools ~= nil then
 166                         good_tool = false
 167                         for _, tool in ipairs(item.tools) do
 168                                 if tool:sub(1, 1) == '~' then
 169                                         good_tool = toolname:find(tool:sub(2)) ~= nil
 170                                 else
 171                                         good_tool = toolname == tool
 172                                 end
 173                                 if good_tool then
 174                                         break
 175                                 end
 176                         end
 177                 end
 178                 if good_rarity and good_tool then
 179                         got_count = got_count + 1
 180                         for _, add_item in ipairs(item.items) do
 181                                 got_items[#got_items+1] = add_item
 182                         end
 183                         if drop.max_items ~= nil and got_count == drop.max_items then
 184                                 break
 185                         end
 186                 end
 187         end
 188         return got_items
 189 end
 190
 191 function core.item_place_node(itemstack, placer, pointed_thing, param2)
 192         local item = itemstack:peek_item()
 193         local def = itemstack:get_definition()
 194         if def.type ~= "node" or pointed_thing.type ~= "node" then
 195                 return itemstack, false
 196         end
 197
 198         local under = pointed_thing.under
 199         local oldnode_under = core.get_node_or_nil(under)
 200         local above = pointed_thing.above
 201         local oldnode_above = core.get_node_or_nil(above)
 202
 203         if not oldnode_under or not oldnode_above then
 204                 core.log("info", placer:get_player_name() .. " tried to place"
 205                         .. " node in unloaded position " .. core.pos_to_string(above))
 206                 return itemstack, false
 207         end
 208
 209         local olddef_under = ItemStack({name=oldnode_under.name}):get_definition()
 210         olddef_under = olddef_under or core.nodedef_default
 211         local olddef_above = ItemStack({name=oldnode_above.name}):get_definition()
 212         olddef_above = olddef_above or core.nodedef_default
 213
 214         if not olddef_above.buildable_to and not olddef_under.buildable_to then
 215                 core.log("info", placer:get_player_name() .. " tried to place"
 216                         .. " node in invalid position " .. core.pos_to_string(above)
 217                         .. ", replacing " .. oldnode_above.name)
 218                 return itemstack, false
 219         end
 220
 221         -- Place above pointed node
 222         local place_to = {x = above.x, y = above.y, z = above.z}
 223
 224         -- If node under is buildable_to, place into it instead (eg. snow)
 225         if olddef_under.buildable_to then
 226                 core.log("info", "node under is buildable to")
 227                 place_to = {x = under.x, y = under.y, z = under.z}
 228         end
 229
 230         if core.is_protected(place_to, placer:get_player_name()) then
 231                 core.log("action", placer:get_player_name()
 232                                 .. " tried to place " .. def.name
 233                                 .. " at protected position "
 234                                 .. core.pos_to_string(place_to))
 235                 core.record_protection_violation(place_to, placer:get_player_name())
 236                 return itemstack
 237         end
 238
 239         core.log("action", placer:get_player_name() .. " places node "
 240                 .. def.name .. " at " .. core.pos_to_string(place_to))
 241
 242         local oldnode = core.get_node(place_to)
 243         local newnode = {name = def.name, param1 = 0, param2 = param2}
 244
 245         -- Calculate direction for wall mounted stuff like torches and signs
 246         if def.paramtype2 == 'wallmounted' and not param2 then
 247                 local dir = {
 248                         x = under.x - above.x,
 249                         y = under.y - above.y,
 250                         z = under.z - above.z
 251                 }
 252                 newnode.param2 = core.dir_to_wallmounted(dir)
 253         -- Calculate the direction for furnaces and chests and stuff
 254         elseif def.paramtype2 == 'facedir' and not param2 then
 255                 local placer_pos = placer:getpos()
 256                 if placer_pos then
 257                         local dir = {
 258                                 x = above.x - placer_pos.x,
 259                                 y = above.y - placer_pos.y,
 260                                 z = above.z - placer_pos.z
 261                         }
 262                         newnode.param2 = core.dir_to_facedir(dir)
 263                         core.log("action", "facedir: " .. newnode.param2)
 264                 end
 265         end
 266
 267         -- Check if the node is attached and if it can be placed there
 268         if core.get_item_group(def.name, "attached_node") ~= 0 and
 269                 not check_attached_node(place_to, newnode) then
 270                 core.log("action", "attached node " .. def.name ..
 271                         " can not be placed at " .. core.pos_to_string(place_to))
 272                 return itemstack, false
 273         end
 274
 275         -- Add node and update
 276         core.add_node(place_to, newnode)
 277
 278         local take_item = true
 279
 280         -- Run callback
 281         if def.after_place_node then
 282                 -- Deepcopy place_to and pointed_thing because callback can modify it
 283                 local place_to_copy = {x=place_to.x, y=place_to.y, z=place_to.z}
 284                 local pointed_thing_copy = copy_pointed_thing(pointed_thing)
 285                 if def.after_place_node(place_to_copy, placer, itemstack,
 286                                 pointed_thing_copy) then
 287                         take_item = false
 288                 end
 289         end
 290
 291         -- Run script hook
 292         local _, callback
 293         for _, callback in ipairs(core.registered_on_placenodes) do
 294                 -- Deepcopy pos, node and pointed_thing because callback can modify them
 295                 local place_to_copy = {x=place_to.x, y=place_to.y, z=place_to.z}
 296                 local newnode_copy = {name=newnode.name, param1=newnode.param1, param2=newnode.param2}
 297                 local oldnode_copy = {name=oldnode.name, param1=oldnode.param1, param2=oldnode.param2}
 298                 local pointed_thing_copy = copy_pointed_thing(pointed_thing)
 299                 if callback(place_to_copy, newnode_copy, placer, oldnode_copy, itemstack, pointed_thing_copy) then
 300                         take_item = false
 301                 end
 302         end
 303
 304         if take_item then
 305                 itemstack:take_item()
 306         end
 307         return itemstack, true
 308 end
 309
 310 function core.item_place_object(itemstack, placer, pointed_thing)
 311         local pos = core.get_pointed_thing_position(pointed_thing, true)
 312         if pos ~= nil then
 313                 local item = itemstack:take_item()
 314                 core.add_item(pos, item)
 315         end
 316         return itemstack
 317 end
 318
 319 function core.item_place(itemstack, placer, pointed_thing, param2)
 320         -- Call on_rightclick if the pointed node defines it
 321         if pointed_thing.type == "node" and placer and
 322                         not placer:get_player_control().sneak then
 323                 local n = core.get_node(pointed_thing.under)
 324                 local nn = n.name
 325                 if core.registered_nodes[nn] and core.registered_nodes[nn].on_rightclick then
 326                         return core.registered_nodes[nn].on_rightclick(pointed_thing.under, n,
 327                                         placer, itemstack, pointed_thing) or itemstack, false
 328                 end
 329         end
 330
 331         if itemstack:get_definition().type == "node" then
 332                 return core.item_place_node(itemstack, placer, pointed_thing, param2)
 333         end
 334         return itemstack
 335 end
 336
 337 function core.item_drop(itemstack, dropper, pos)
 338         if dropper.is_player then
 339                 local v = dropper:get_look_dir()
 340                 local p = {x=pos.x, y=pos.y+1.2, z=pos.z}
 341                 local cs = itemstack:get_count()
 342                 if dropper:get_player_control().sneak then
 343                         cs = 1
 344                 end
 345                 local item = itemstack:take_item(cs)
 346                 local obj = core.add_item(p, item)
 347                 if obj then
 348                         v.x = v.x*2
 349                         v.y = v.y*2 + 2
 350                         v.z = v.z*2
 351                         obj:setvelocity(v)
 352                 end
 353
 354         else
 355                 core.add_item(pos, itemstack)
 356         end
 357         return itemstack
 358 end
 359
 360 function core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed_thing)
 361         for _, callback in pairs(core.registered_on_item_eats) do
 362                 local result = callback(hp_change, replace_with_item, itemstack, user, pointed_thing)
 363                 if result then
 364                         return result
 365                 end
 366         end
 367         if itemstack:take_item() ~= nil then
 368                 user:set_hp(user:get_hp() + hp_change)
 369
 370                 if replace_with_item then
 371                         if itemstack:is_empty() then
 372                                 itemstack:add_item(replace_with_item)
 373                         else
 374                                 local inv = user:get_inventory()
 375                                 if inv:room_for_item("main", {name=replace_with_item}) then
 376                                         inv:add_item("main", replace_with_item)
 377                                 else
 378                                         local pos = user:getpos()
 379                                         pos.y = math.floor(pos.y + 0.5)
 380                                         core.add_item(pos, replace_with_item)
 381                                 end
 382                         end
 383                 end
 384         end
 385         return itemstack
 386 end
 387
 388 function core.item_eat(hp_change, replace_with_item)
 389         return function(itemstack, user, pointed_thing)  -- closure
 390                 return core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed_thing)
 391         end
 392 end
 393
 394 function core.node_punch(pos, node, puncher, pointed_thing)
 395         -- Run script hook
 396         for _, callback in ipairs(core.registered_on_punchnodes) do
 397                 -- Copy pos and node because callback can modify them
 398                 local pos_copy = vector.new(pos)
 399                 local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
 400                 local pointed_thing_copy = pointed_thing and copy_pointed_thing(pointed_thing) or nil
 401                 callback(pos_copy, node_copy, puncher, pointed_thing_copy)
 402         end
 403 end
 404
 405 function core.handle_node_drops(pos, drops, digger)
 406         -- Add dropped items to object's inventory
 407         if digger:get_inventory() then
 408                 local _, dropped_item
 409                 for _, dropped_item in ipairs(drops) do
 410                         local left = digger:get_inventory():add_item("main", dropped_item)
 411                         if not left:is_empty() then
 412                                 local p = {
 413                                         x = pos.x + math.random()/2-0.25,
 414                                         y = pos.y + math.random()/2-0.25,
 415                                         z = pos.z + math.random()/2-0.25,
 416                                 }
 417                                 core.add_item(p, left)
 418                         end
 419                 end
 420         end
 421 end
 422
 423 function core.node_dig(pos, node, digger)
 424         local def = ItemStack({name=node.name}):get_definition()
 425         if not def.diggable or (def.can_dig and not def.can_dig(pos,digger)) then
 426                 core.log("info", digger:get_player_name() .. " tried to dig "
 427                         .. node.name .. " which is not diggable "
 428                         .. core.pos_to_string(pos))
 429                 return
 430         end
 431
 432         if core.is_protected(pos, digger:get_player_name()) then
 433                 core.log("action", digger:get_player_name()
 434                                 .. " tried to dig " .. node.name
 435                                 .. " at protected position "
 436                                 .. core.pos_to_string(pos))
 437                 core.record_protection_violation(pos, digger:get_player_name())
 438                 return
 439         end
 440
 441         core.log('action', digger:get_player_name() .. " digs "
 442                 .. node.name .. " at " .. core.pos_to_string(pos))
 443
 444         local wielded = digger:get_wielded_item()
 445         local drops = core.get_node_drops(node.name, wielded:get_name())
 446
 447         local wdef = wielded:get_definition()
 448         local tp = wielded:get_tool_capabilities()
 449         local dp = core.get_dig_params(def.groups, tp)
 450         if wdef and wdef.after_use then
 451                 wielded = wdef.after_use(wielded, digger, node, dp) or wielded
 452         else
 453                 -- Wear out tool
 454                 if not core.setting_getbool("creative_mode") then
 455                         wielded:add_wear(dp.wear)
 456                 end
 457         end
 458         digger:set_wielded_item(wielded)
 459
 460         -- Handle drops
 461         core.handle_node_drops(pos, drops, digger)
 462
 463         local oldmetadata = nil
 464         if def.after_dig_node then
 465                 oldmetadata = core.get_meta(pos):to_table()
 466         end
 467
 468         -- Remove node and update
 469         core.remove_node(pos)
 470
 471         -- Run callback
 472         if def.after_dig_node then
 473                 -- Copy pos and node because callback can modify them
 474                 local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
 475                 local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
 476                 def.after_dig_node(pos_copy, node_copy, oldmetadata, digger)
 477         end
 478
 479         -- Run script hook
 480         local _, callback
 481         for _, callback in ipairs(core.registered_on_dignodes) do
 482                 -- Copy pos and node because callback can modify them
 483                 local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
 484                 local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
 485                 callback(pos_copy, node_copy, digger)
 486         end
 487 end
 488
 489 -- This is used to allow mods to redefine core.item_place and so on
 490 -- NOTE: This is not the preferred way. Preferred way is to provide enough
 491 --       callbacks to not require redefining global functions. -celeron55
 492 local function redef_wrapper(table, name)
 493         return function(...)
 494                 return table[name](...)
 495         end
 496 end
 497
 498 --
 499 -- Item definition defaults
 500 --
 501
 502 core.nodedef_default = {
 503         -- Item properties
 504         type="node",
 505         -- name intentionally not defined here
 506         description = "",
 507         groups = {},
 508         inventory_image = "",
 509         wield_image = "",
 510         wield_scale = {x=1,y=1,z=1},
 511         stack_max = 99,
 512         usable = false,
 513         liquids_pointable = false,
 514         tool_capabilities = nil,
 515         node_placement_prediction = nil,
 516
 517         -- Interaction callbacks
 518         on_place = redef_wrapper(core, 'item_place'), -- core.item_place
 519         on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
 520         on_use = nil,
 521         can_dig = nil,
 522
 523         on_punch = redef_wrapper(core, 'node_punch'), -- core.node_punch
 524         on_rightclick = nil,
 525         on_dig = redef_wrapper(core, 'node_dig'), -- core.node_dig
 526
 527         on_receive_fields = nil,
 528
 529         on_metadata_inventory_move = core.node_metadata_inventory_move_allow_all,
 530         on_metadata_inventory_offer = core.node_metadata_inventory_offer_allow_all,
 531         on_metadata_inventory_take = core.node_metadata_inventory_take_allow_all,
 532
 533         -- Node properties
 534         drawtype = "normal",
 535         visual_scale = 1.0,
 536         -- Don't define these because otherwise the old tile_images and
 537         -- special_materials wouldn't be read
 538         --tiles ={""},
 539         --special_tiles = {
 540         --      {name="", backface_culling=true},
 541         --      {name="", backface_culling=true},
 542         --},
 543         alpha = 255,
 544         post_effect_color = {a=0, r=0, g=0, b=0},
 545         paramtype = "none",
 546         paramtype2 = "none",
 547         is_ground_content = true,
 548         sunlight_propagates = false,
 549         walkable = true,
 550         pointable = true,
 551         diggable = true,
 552         climbable = false,
 553         buildable_to = false,
 554         liquidtype = "none",
 555         liquid_alternative_flowing = "",
 556         liquid_alternative_source = "",
 557         liquid_viscosity = 0,
 558         drowning = 0,
 559         light_source = 0,
 560         damage_per_second = 0,
 561         selection_box = {type="regular"},
 562         legacy_facedir_simple = false,
 563         legacy_wallmounted = false,
 564 }
 565
 566 core.craftitemdef_default = {
 567         type="craft",
 568         -- name intentionally not defined here
 569         description = "",
 570         groups = {},
 571         inventory_image = "",
 572         wield_image = "",
 573         wield_scale = {x=1,y=1,z=1},
 574         stack_max = 99,
 575         liquids_pointable = false,
 576         tool_capabilities = nil,
 577
 578         -- Interaction callbacks
 579         on_place = redef_wrapper(core, 'item_place'), -- core.item_place
 580         on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
 581         on_use = nil,
 582 }
 583
 584 core.tooldef_default = {
 585         type="tool",
 586         -- name intentionally not defined here
 587         description = "",
 588         groups = {},
 589         inventory_image = "",
 590         wield_image = "",
 591         wield_scale = {x=1,y=1,z=1},
 592         stack_max = 1,
 593         liquids_pointable = false,
 594         tool_capabilities = nil,
 595
 596         -- Interaction callbacks
 597         on_place = redef_wrapper(core, 'item_place'), -- core.item_place
 598         on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
 599         on_use = nil,
 600 }
 601
 602 core.noneitemdef_default = {  -- This is used for the hand and unknown items
 603         type="none",
 604         -- name intentionally not defined here
 605         description = "",
 606         groups = {},
 607         inventory_image = "",
 608         wield_image = "",
 609         wield_scale = {x=1,y=1,z=1},
 610         stack_max = 99,
 611         liquids_pointable = false,
 612         tool_capabilities = nil,
 613
 614         -- Interaction callbacks
 615         on_place = redef_wrapper(core, 'item_place'),
 616         on_drop = nil,
 617         on_use = nil,
 618 }