minetest/builtin/game/item.lua
Auke Kok b539985ab8 Fix two nul deref if digging unknown nodes. (#5398)
Introduced by d785456b3fa35faf47cb972fde9e8668382c5e22 (#5162)
2017-03-15 08:04:53 +01:00

667 lines
18 KiB
Lua

-- Minetest: builtin/item.lua
local builtin_shared = ...
local function copy_pointed_thing(pointed_thing)
return {
type = pointed_thing.type,
above = vector.new(pointed_thing.above),
under = vector.new(pointed_thing.under),
ref = pointed_thing.ref,
}
end
--
-- Item definition helpers
--
function core.inventorycube(img1, img2, img3)
img2 = img2 or img1
img3 = img3 or img1
return "[inventorycube"
.. "{" .. img1:gsub("%^", "&")
.. "{" .. img2:gsub("%^", "&")
.. "{" .. img3:gsub("%^", "&")
end
function core.get_pointed_thing_position(pointed_thing, above)
if pointed_thing.type == "node" then
if above then
-- The position where a node would be placed
return pointed_thing.above
end
-- The position where a node would be dug
return pointed_thing.under
elseif pointed_thing.type == "object" then
return pointed_thing.ref and pointed_thing.ref:getpos()
end
end
function core.dir_to_facedir(dir, is6d)
--account for y if requested
if is6d and math.abs(dir.y) > math.abs(dir.x) and math.abs(dir.y) > math.abs(dir.z) then
--from above
if dir.y < 0 then
if math.abs(dir.x) > math.abs(dir.z) then
if dir.x < 0 then
return 19
else
return 13
end
else
if dir.z < 0 then
return 10
else
return 4
end
end
--from below
else
if math.abs(dir.x) > math.abs(dir.z) then
if dir.x < 0 then
return 15
else
return 17
end
else
if dir.z < 0 then
return 6
else
return 8
end
end
end
--otherwise, place horizontally
elseif math.abs(dir.x) > math.abs(dir.z) then
if dir.x < 0 then
return 3
else
return 1
end
else
if dir.z < 0 then
return 2
else
return 0
end
end
end
-- Table of possible dirs
local facedir_to_dir = {
{x= 0, y=0, z= 1},
{x= 1, y=0, z= 0},
{x= 0, y=0, z=-1},
{x=-1, y=0, z= 0},
{x= 0, y=-1, z= 0},
{x= 0, y=1, z= 0},
}
-- Mapping from facedir value to index in facedir_to_dir.
local facedir_to_dir_map = {
[0]=1, 2, 3, 4,
5, 2, 6, 4,
6, 2, 5, 4,
1, 5, 3, 6,
1, 6, 3, 5,
1, 4, 3, 2,
}
function core.facedir_to_dir(facedir)
return facedir_to_dir[facedir_to_dir_map[facedir % 32]]
end
function core.dir_to_wallmounted(dir)
if math.abs(dir.y) > math.max(math.abs(dir.x), math.abs(dir.z)) then
if dir.y < 0 then
return 1
else
return 0
end
elseif math.abs(dir.x) > math.abs(dir.z) then
if dir.x < 0 then
return 3
else
return 2
end
else
if dir.z < 0 then
return 5
else
return 4
end
end
end
-- table of dirs in wallmounted order
local wallmounted_to_dir = {
[0] = {x = 0, y = 1, z = 0},
{x = 0, y = -1, z = 0},
{x = 1, y = 0, z = 0},
{x = -1, y = 0, z = 0},
{x = 0, y = 0, z = 1},
{x = 0, y = 0, z = -1},
}
function core.wallmounted_to_dir(wallmounted)
return wallmounted_to_dir[wallmounted % 8]
end
function core.dir_to_yaw(dir)
return -math.atan2(dir.x, dir.z)
end
function core.yaw_to_dir(yaw)
return {x = -math.sin(yaw), y = 0, z = math.cos(yaw)}
end
function core.get_node_drops(nodename, toolname)
local def = core.registered_nodes[nodename]
local drop = def and def.drop
if drop == nil then
-- default drop
return {nodename}
elseif type(drop) == "string" then
-- itemstring drop
return {drop}
elseif drop.items == nil then
-- drop = {} to disable default drop
return {}
end
-- Extended drop table
local got_items = {}
local got_count = 0
local _, item, tool
for _, item in ipairs(drop.items) do
local good_rarity = true
local good_tool = true
if item.rarity ~= nil then
good_rarity = item.rarity < 1 or math.random(item.rarity) == 1
end
if item.tools ~= nil then
good_tool = false
for _, tool in ipairs(item.tools) do
if tool:sub(1, 1) == '~' then
good_tool = toolname:find(tool:sub(2)) ~= nil
else
good_tool = toolname == tool
end
if good_tool then
break
end
end
end
if good_rarity and good_tool then
got_count = got_count + 1
for _, add_item in ipairs(item.items) do
got_items[#got_items+1] = add_item
end
if drop.max_items ~= nil and got_count == drop.max_items then
break
end
end
end
return got_items
end
function core.item_place_node(itemstack, placer, pointed_thing, param2)
local def = itemstack:get_definition()
if def.type ~= "node" or pointed_thing.type ~= "node" then
return itemstack, false
end
local under = pointed_thing.under
local oldnode_under = core.get_node_or_nil(under)
local above = pointed_thing.above
local oldnode_above = core.get_node_or_nil(above)
local playername = placer:get_player_name()
if not oldnode_under or not oldnode_above then
core.log("info", playername .. " tried to place"
.. " node in unloaded position " .. core.pos_to_string(above))
return itemstack, false
end
local olddef_under = core.registered_nodes[oldnode_under.name]
olddef_under = olddef_under or core.nodedef_default
local olddef_above = core.registered_nodes[oldnode_above.name]
olddef_above = olddef_above or core.nodedef_default
if not olddef_above.buildable_to and not olddef_under.buildable_to then
core.log("info", playername .. " tried to place"
.. " node in invalid position " .. core.pos_to_string(above)
.. ", replacing " .. oldnode_above.name)
return itemstack, false
end
-- Place above pointed node
local place_to = {x = above.x, y = above.y, z = above.z}
-- If node under is buildable_to, place into it instead (eg. snow)
if olddef_under.buildable_to then
core.log("info", "node under is buildable to")
place_to = {x = under.x, y = under.y, z = under.z}
end
if core.is_protected(place_to, playername) and
not minetest.check_player_privs(placer, "protection_bypass") then
core.log("action", playername
.. " tried to place " .. def.name
.. " at protected position "
.. core.pos_to_string(place_to))
core.record_protection_violation(place_to, playername)
return itemstack
end
core.log("action", playername .. " places node "
.. def.name .. " at " .. core.pos_to_string(place_to))
local oldnode = core.get_node(place_to)
local newnode = {name = def.name, param1 = 0, param2 = param2}
-- Calculate direction for wall mounted stuff like torches and signs
if def.place_param2 ~= nil then
newnode.param2 = def.place_param2
elseif (def.paramtype2 == "wallmounted" or
def.paramtype2 == "colorwallmounted") and not param2 then
local dir = {
x = under.x - above.x,
y = under.y - above.y,
z = under.z - above.z
}
newnode.param2 = core.dir_to_wallmounted(dir)
-- Calculate the direction for furnaces and chests and stuff
elseif (def.paramtype2 == "facedir" or
def.paramtype2 == "colorfacedir") and not param2 then
local placer_pos = placer:getpos()
if placer_pos then
local dir = {
x = above.x - placer_pos.x,
y = above.y - placer_pos.y,
z = above.z - placer_pos.z
}
newnode.param2 = core.dir_to_facedir(dir)
core.log("action", "facedir: " .. newnode.param2)
end
end
-- Check if the node is attached and if it can be placed there
if core.get_item_group(def.name, "attached_node") ~= 0 and
not builtin_shared.check_attached_node(place_to, newnode) then
core.log("action", "attached node " .. def.name ..
" can not be placed at " .. core.pos_to_string(place_to))
return itemstack, false
end
-- Add node and update
core.add_node(place_to, newnode)
local take_item = true
-- Run callback
if def.after_place_node then
-- Deepcopy place_to and pointed_thing because callback can modify it
local place_to_copy = {x=place_to.x, y=place_to.y, z=place_to.z}
local pointed_thing_copy = copy_pointed_thing(pointed_thing)
if def.after_place_node(place_to_copy, placer, itemstack,
pointed_thing_copy) then
take_item = false
end
end
-- Run script hook
for _, callback in ipairs(core.registered_on_placenodes) do
-- Deepcopy pos, node and pointed_thing because callback can modify them
local place_to_copy = {x=place_to.x, y=place_to.y, z=place_to.z}
local newnode_copy = {name=newnode.name, param1=newnode.param1, param2=newnode.param2}
local oldnode_copy = {name=oldnode.name, param1=oldnode.param1, param2=oldnode.param2}
local pointed_thing_copy = copy_pointed_thing(pointed_thing)
if callback(place_to_copy, newnode_copy, placer, oldnode_copy, itemstack, pointed_thing_copy) then
take_item = false
end
end
if take_item then
itemstack:take_item()
end
return itemstack, true
end
function core.item_place_object(itemstack, placer, pointed_thing)
local pos = core.get_pointed_thing_position(pointed_thing, true)
if pos ~= nil then
local item = itemstack:take_item()
core.add_item(pos, item)
end
return itemstack
end
function core.item_place(itemstack, placer, pointed_thing, param2)
-- Call on_rightclick if the pointed node defines it
if pointed_thing.type == "node" and placer and
not placer:get_player_control().sneak then
local n = core.get_node(pointed_thing.under)
local nn = n.name
if core.registered_nodes[nn] and core.registered_nodes[nn].on_rightclick then
return core.registered_nodes[nn].on_rightclick(pointed_thing.under, n,
placer, itemstack, pointed_thing) or itemstack, false
end
end
if itemstack:get_definition().type == "node" then
return core.item_place_node(itemstack, placer, pointed_thing, param2)
end
return itemstack
end
function core.item_secondary_use(itemstack, placer)
return itemstack
end
function core.item_drop(itemstack, dropper, pos)
if dropper and dropper:is_player() then
local v = dropper:get_look_dir()
local p = {x=pos.x, y=pos.y+1.2, z=pos.z}
local cs = itemstack:get_count()
if dropper:get_player_control().sneak then
cs = 1
end
local item = itemstack:take_item(cs)
local obj = core.add_item(p, item)
if obj then
v.x = v.x*2
v.y = v.y*2 + 2
v.z = v.z*2
obj:setvelocity(v)
obj:get_luaentity().dropped_by = dropper:get_player_name()
return itemstack
end
else
if core.add_item(pos, itemstack) then
return itemstack
end
end
-- If we reach this, adding the object to the
-- environment failed
end
function core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed_thing)
for _, callback in pairs(core.registered_on_item_eats) do
local result = callback(hp_change, replace_with_item, itemstack, user, pointed_thing)
if result then
return result
end
end
if itemstack:take_item() ~= nil then
user:set_hp(user:get_hp() + hp_change)
if replace_with_item then
if itemstack:is_empty() then
itemstack:add_item(replace_with_item)
else
local inv = user:get_inventory()
if inv:room_for_item("main", {name=replace_with_item}) then
inv:add_item("main", replace_with_item)
else
local pos = user:getpos()
pos.y = math.floor(pos.y + 0.5)
core.add_item(pos, replace_with_item)
end
end
end
end
return itemstack
end
function core.item_eat(hp_change, replace_with_item)
return function(itemstack, user, pointed_thing) -- closure
return core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed_thing)
end
end
function core.node_punch(pos, node, puncher, pointed_thing)
-- Run script hook
for _, callback in ipairs(core.registered_on_punchnodes) do
-- Copy pos and node because callback can modify them
local pos_copy = vector.new(pos)
local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
local pointed_thing_copy = pointed_thing and copy_pointed_thing(pointed_thing) or nil
callback(pos_copy, node_copy, puncher, pointed_thing_copy)
end
end
function core.handle_node_drops(pos, drops, digger)
-- Add dropped items to object's inventory
if digger:get_inventory() then
local _, dropped_item
for _, dropped_item in ipairs(drops) do
local left = digger:get_inventory():add_item("main", dropped_item)
if not left:is_empty() then
local p = {
x = pos.x + math.random()/2-0.25,
y = pos.y + math.random()/2-0.25,
z = pos.z + math.random()/2-0.25,
}
core.add_item(p, left)
end
end
end
end
function core.node_dig(pos, node, digger)
local def = core.registered_nodes[node.name]
if def and (not def.diggable or
(def.can_dig and not def.can_dig(pos, digger))) then
core.log("info", digger:get_player_name() .. " tried to dig "
.. node.name .. " which is not diggable "
.. core.pos_to_string(pos))
return
end
if core.is_protected(pos, digger:get_player_name()) and
not minetest.check_player_privs(digger, "protection_bypass") then
core.log("action", digger:get_player_name()
.. " tried to dig " .. node.name
.. " at protected position "
.. core.pos_to_string(pos))
core.record_protection_violation(pos, digger:get_player_name())
return
end
core.log('action', digger:get_player_name() .. " digs "
.. node.name .. " at " .. core.pos_to_string(pos))
local wielded = digger:get_wielded_item()
local drops = core.get_node_drops(node.name, wielded:get_name())
local wdef = wielded:get_definition()
local tp = wielded:get_tool_capabilities()
local dp = core.get_dig_params(def and def.groups, tp)
if wdef and wdef.after_use then
wielded = wdef.after_use(wielded, digger, node, dp) or wielded
else
-- Wear out tool
if not core.setting_getbool("creative_mode") then
wielded:add_wear(dp.wear)
if wielded:get_count() == 0 and wdef.sound and wdef.sound.breaks then
core.sound_play(wdef.sound.breaks, {pos = pos, gain = 0.5})
end
end
end
digger:set_wielded_item(wielded)
-- Handle drops
core.handle_node_drops(pos, drops, digger)
local oldmetadata = nil
if def and def.after_dig_node then
oldmetadata = core.get_meta(pos):to_table()
end
-- Remove node and update
core.remove_node(pos)
-- Run callback
if def and def.after_dig_node then
-- Copy pos and node because callback can modify them
local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
def.after_dig_node(pos_copy, node_copy, oldmetadata, digger)
end
-- Run script hook
local _, callback
for _, callback in ipairs(core.registered_on_dignodes) do
local origin = core.callback_origins[callback]
if origin then
core.set_last_run_mod(origin.mod)
--print("Running " .. tostring(callback) ..
-- " (a " .. origin.name .. " callback in " .. origin.mod .. ")")
else
--print("No data associated with callback")
end
-- Copy pos and node because callback can modify them
local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
callback(pos_copy, node_copy, digger)
end
end
-- This is used to allow mods to redefine core.item_place and so on
-- NOTE: This is not the preferred way. Preferred way is to provide enough
-- callbacks to not require redefining global functions. -celeron55
local function redef_wrapper(table, name)
return function(...)
return table[name](...)
end
end
--
-- Item definition defaults
--
core.nodedef_default = {
-- Item properties
type="node",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = {x=1,y=1,z=1},
stack_max = 99,
usable = false,
liquids_pointable = false,
tool_capabilities = nil,
node_placement_prediction = nil,
-- Interaction callbacks
on_place = redef_wrapper(core, 'item_place'), -- core.item_place
on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
on_use = nil,
can_dig = nil,
on_punch = redef_wrapper(core, 'node_punch'), -- core.node_punch
on_rightclick = nil,
on_dig = redef_wrapper(core, 'node_dig'), -- core.node_dig
on_receive_fields = nil,
on_metadata_inventory_move = core.node_metadata_inventory_move_allow_all,
on_metadata_inventory_offer = core.node_metadata_inventory_offer_allow_all,
on_metadata_inventory_take = core.node_metadata_inventory_take_allow_all,
-- Node properties
drawtype = "normal",
visual_scale = 1.0,
-- Don't define these because otherwise the old tile_images and
-- special_materials wouldn't be read
--tiles ={""},
--special_tiles = {
-- {name="", backface_culling=true},
-- {name="", backface_culling=true},
--},
alpha = 255,
post_effect_color = {a=0, r=0, g=0, b=0},
paramtype = "none",
paramtype2 = "none",
is_ground_content = true,
sunlight_propagates = false,
walkable = true,
pointable = true,
diggable = true,
climbable = false,
buildable_to = false,
floodable = false,
liquidtype = "none",
liquid_alternative_flowing = "",
liquid_alternative_source = "",
liquid_viscosity = 0,
drowning = 0,
light_source = 0,
damage_per_second = 0,
selection_box = {type="regular"},
legacy_facedir_simple = false,
legacy_wallmounted = false,
}
core.craftitemdef_default = {
type="craft",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = {x=1,y=1,z=1},
stack_max = 99,
liquids_pointable = false,
tool_capabilities = nil,
-- Interaction callbacks
on_place = redef_wrapper(core, 'item_place'), -- core.item_place
on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
on_secondary_use = redef_wrapper(core, 'item_secondary_use'),
on_use = nil,
}
core.tooldef_default = {
type="tool",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = {x=1,y=1,z=1},
stack_max = 1,
liquids_pointable = false,
tool_capabilities = nil,
-- Interaction callbacks
on_place = redef_wrapper(core, 'item_place'), -- core.item_place
on_secondary_use = redef_wrapper(core, 'item_secondary_use'),
on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
on_use = nil,
}
core.noneitemdef_default = { -- This is used for the hand and unknown items
type="none",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = {x=1,y=1,z=1},
stack_max = 99,
liquids_pointable = false,
tool_capabilities = nil,
-- Interaction callbacks
on_place = redef_wrapper(core, 'item_place'),
on_secondary_use = redef_wrapper(core, 'item_secondary_use'),
on_drop = nil,
on_use = nil,
}