minetest/builtin/game/item.lua

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-- 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
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--
-- Item definition helpers
--
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function core.get_pointed_thing_position(pointed_thing, above)
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if pointed_thing.type == "node" then
if above then
-- The position where a node would be placed
return pointed_thing.above
end
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-- The position where a node would be dug
return pointed_thing.under
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elseif pointed_thing.type == "object" then
return pointed_thing.ref and pointed_thing.ref:get_pos()
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end
end
local function has_all_groups(tbl, required_groups)
if type(required_groups) == "string" then
return (tbl[required_groups] or 0) ~= 0
end
for _, group in ipairs(required_groups) do
if (tbl[group] or 0) == 0 then
return false
end
end
return true
end
function core.get_node_drops(node, toolname)
-- Compatibility, if node is string
local nodename = node
local param2 = 0
-- New format, if node is table
if (type(node) == "table") then
nodename = node.name
param2 = node.param2
end
local def = core.registered_nodes[nodename]
local drop = def and def.drop
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local ptype = def and def.paramtype2
-- get color, if there is color (otherwise nil)
local palette_index = core.strip_param2_color(param2, ptype)
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if drop == nil then
-- default drop
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if palette_index then
local stack = ItemStack(nodename)
stack:get_meta():set_int("palette_index", palette_index)
return {stack:to_string()}
end
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return {nodename}
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elseif type(drop) == "string" then
-- itemstring drop
return drop ~= "" and {drop} or {}
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elseif drop.items == nil then
-- drop = {} to disable default drop
return {}
end
-- Extended drop table
local got_items = {}
local got_count = 0
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 or item.tool_groups ~= nil then
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good_tool = false
end
if item.tools ~= nil and toolname then
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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 item.tool_groups ~= nil and toolname then
local tooldef = core.registered_items[toolname]
if tooldef ~= nil and type(tooldef.groups) == "table" then
if type(item.tool_groups) == "string" then
-- tool_groups can be a string which specifies the required group
good_tool = core.get_item_group(toolname, item.tool_groups) ~= 0
else
-- tool_groups can be a list of sufficient requirements.
-- i.e. if any item in the list can be satisfied then the tool is good
assert(type(item.tool_groups) == "table")
for _, required_groups in ipairs(item.tool_groups) do
-- required_groups can be either a string (a single group),
-- or an array of strings where all must be in tooldef.groups
good_tool = has_all_groups(tooldef.groups, required_groups)
if good_tool then
break
end
end
end
end
end
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if good_rarity and good_tool then
got_count = got_count + 1
for _, add_item in ipairs(item.items) do
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-- add color, if necessary
if item.inherit_color and palette_index then
local stack = ItemStack(add_item)
stack:get_meta():set_int("palette_index", palette_index)
add_item = stack:to_string()
end
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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
local function user_name(user)
return user and user:get_player_name() or ""
end
-- Returns a logging function. For empty names, does not log.
local function make_log(name)
return name ~= "" and core.log or function() end
end
function core.item_place_node(itemstack, placer, pointed_thing, param2,
prevent_after_place)
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local def = itemstack:get_definition()
if def.type ~= "node" or pointed_thing.type ~= "node" then
return itemstack, nil
end
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local under = pointed_thing.under
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local oldnode_under = core.get_node_or_nil(under)
local above = pointed_thing.above
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local oldnode_above = core.get_node_or_nil(above)
local playername = user_name(placer)
local log = make_log(playername)
if not oldnode_under or not oldnode_above then
log("info", playername .. " tried to place"
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.. " node in unloaded position " .. core.pos_to_string(above))
return itemstack, nil
end
local olddef_under = core.registered_nodes[oldnode_under.name]
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olddef_under = olddef_under or core.nodedef_default
local olddef_above = core.registered_nodes[oldnode_above.name]
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olddef_above = olddef_above or core.nodedef_default
if not olddef_above.buildable_to and not olddef_under.buildable_to then
log("info", playername .. " tried to place"
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.. " node in invalid position " .. core.pos_to_string(above)
.. ", replacing " .. oldnode_above.name)
return itemstack, nil
end
-- Place above pointed node
local place_to = vector.new(above)
-- If node under is buildable_to, place into it instead (eg. snow)
if olddef_under.buildable_to then
log("info", "node under is buildable to")
place_to = vector.new(under)
end
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if core.is_protected(place_to, playername) then
log("action", playername
.. " tried to place " .. def.name
.. " at protected position "
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.. core.pos_to_string(place_to))
core.record_protection_violation(place_to, playername)
return itemstack, nil
end
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local oldnode = core.get_node(place_to)
local newnode = {name = def.name, param1 = 0, param2 = param2 or 0}
-- 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 = vector.subtract(under, above)
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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 and placer:get_pos()
if placer_pos then
local dir = vector.subtract(above, placer_pos)
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newnode.param2 = core.dir_to_facedir(dir)
log("info", "facedir: " .. newnode.param2)
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end
end
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local metatable = itemstack:get_meta():to_table().fields
-- Transfer color information
if metatable.palette_index and not def.place_param2 then
local color_divisor = nil
if def.paramtype2 == "color" then
color_divisor = 1
elseif def.paramtype2 == "colorwallmounted" then
color_divisor = 8
elseif def.paramtype2 == "colorfacedir" then
color_divisor = 32
elseif def.paramtype2 == "colordegrotate" then
color_divisor = 32
end
if color_divisor then
local color = math.floor(metatable.palette_index / color_divisor)
local other = newnode.param2 % color_divisor
newnode.param2 = color * color_divisor + other
end
end
-- Check if the node is attached and if it can be placed there
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if core.get_item_group(def.name, "attached_node") ~= 0 and
not builtin_shared.check_attached_node(place_to, newnode) then
log("action", "attached node " .. def.name ..
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" can not be placed at " .. core.pos_to_string(place_to))
return itemstack, nil
end
log("action", playername .. " places node "
.. def.name .. " at " .. core.pos_to_string(place_to))
-- Add node and update
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core.add_node(place_to, newnode)
-- Play sound if it was done by a player
if playername ~= "" and def.sounds and def.sounds.place then
core.sound_play(def.sounds.place, {
pos = place_to,
exclude_player = playername,
}, true)
end
local take_item = true
-- Run callback
if def.after_place_node and not prevent_after_place then
-- Deepcopy place_to and pointed_thing because callback can modify it
local place_to_copy = vector.new(place_to)
local pointed_thing_copy = copy_pointed_thing(pointed_thing)
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if def.after_place_node(place_to_copy, placer, itemstack,
pointed_thing_copy) then
take_item = false
end
end
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-- Run script hook
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for _, callback in ipairs(core.registered_on_placenodes) do
-- Deepcopy pos, node and pointed_thing because callback can modify them
local place_to_copy = vector.new(place_to)
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
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end
if take_item then
itemstack:take_item()
end
return itemstack, place_to
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end
-- deprecated, item_place does not call this
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function core.item_place_object(itemstack, placer, pointed_thing)
local pos = core.get_pointed_thing_position(pointed_thing, true)
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if pos ~= nil then
local item = itemstack:take_item()
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core.add_item(pos, item)
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end
return itemstack
end
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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
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local n = core.get_node(pointed_thing.under)
local nn = n.name
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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, nil
end
end
-- Place if node, otherwise do nothing
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if itemstack:get_definition().type == "node" then
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return core.item_place_node(itemstack, placer, pointed_thing, param2)
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end
return itemstack, nil
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end
function core.item_secondary_use(itemstack, placer)
return itemstack
end
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function core.item_drop(itemstack, dropper, pos)
local dropper_is_player = dropper and dropper:is_player()
local p = table.copy(pos)
local cnt = itemstack:get_count()
if dropper_is_player then
p.y = p.y + 1.2
end
local item = itemstack:take_item(cnt)
local obj = core.add_item(p, item)
if obj then
if dropper_is_player then
local dir = dropper:get_look_dir()
dir.x = dir.x * 2.9
dir.y = dir.y * 2.9 + 2
dir.z = dir.z * 2.9
obj:set_velocity(dir)
obj:get_luaentity().dropped_by = dropper:get_player_name()
end
return itemstack
end
-- If we reach this, adding the object to the
-- environment failed
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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
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end
end
-- read definition before potentially emptying the stack
local def = itemstack:get_definition()
if itemstack:take_item():is_empty() then
return itemstack
end
if def and def.sound and def.sound.eat then
core.sound_play(def.sound.eat, {
pos = user:get_pos(),
max_hear_distance = 16
}, true)
end
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-- Changing hp might kill the player causing mods to do who-knows-what to the
-- inventory, so do this before set_hp().
if replace_with_item then
if itemstack:is_empty() then
itemstack:add_item(replace_with_item)
else
local inv = user:get_inventory()
-- Check if inv is null, since non-players don't have one
if inv and inv:room_for_item("main", {name=replace_with_item}) then
inv:add_item("main", replace_with_item)
else
local pos = user:get_pos()
pos.y = math.floor(pos.y + 0.5)
core.add_item(pos, replace_with_item)
end
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end
end
user:set_wielded_item(itemstack)
user:set_hp(user:get_hp() + hp_change)
return nil -- don't overwrite wield item a second time
end
function core.item_eat(hp_change, replace_with_item)
return function(itemstack, user, pointed_thing) -- closure
if user then
return core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed_thing)
end
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end
end
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function core.node_punch(pos, node, puncher, pointed_thing)
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-- Run script hook
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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)
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end
end
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function core.handle_node_drops(pos, drops, digger)
-- Add dropped items to object's inventory
local inv = digger and digger:get_inventory()
local give_item
if inv then
give_item = function(item)
return inv:add_item("main", item)
end
else
give_item = function(item)
-- itemstring to ItemStack for left:is_empty()
return ItemStack(item)
end
end
for _, dropped_item in pairs(drops) do
local left = give_item(dropped_item)
if not left:is_empty() then
local p = vector.offset(pos,
math.random()/2-0.25,
math.random()/2-0.25,
math.random()/2-0.25
)
core.add_item(p, left)
end
end
end
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function core.node_dig(pos, node, digger)
local diggername = user_name(digger)
local log = make_log(diggername)
local def = core.registered_nodes[node.name]
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-- Copy pos because the callback could modify it
if def and (not def.diggable or
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(def.can_dig and not def.can_dig(vector.new(pos), digger))) then
log("info", diggername .. " tried to dig "
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.. node.name .. " which is not diggable "
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.. core.pos_to_string(pos))
return false
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end
if core.is_protected(pos, diggername) then
log("action", diggername
.. " tried to dig " .. node.name
.. " at protected position "
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.. core.pos_to_string(pos))
core.record_protection_violation(pos, diggername)
return false
end
log('action', diggername .. " digs "
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.. node.name .. " at " .. core.pos_to_string(pos))
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local wielded = digger and digger:get_wielded_item()
local drops = core.get_node_drops(node, wielded and wielded:get_name())
if wielded then
local wdef = wielded:get_definition()
local tp = wielded:get_tool_capabilities()
local dp = core.get_dig_params(def and def.groups, tp, wielded:get_wear())
if wdef and wdef.after_use then
wielded = wdef.after_use(wielded, digger, node, dp) or wielded
else
-- Wear out tool
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if not core.is_creative_enabled(diggername) 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
}, true)
end
end
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end
digger:set_wielded_item(wielded)
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end
-- Check to see if metadata should be preserved.
if def and def.preserve_metadata then
local oldmeta = core.get_meta(pos):to_table().fields
-- Copy pos and node because the callback can modify them.
local pos_copy = vector.new(pos)
local node_copy = {name=node.name, param1=node.param1, param2=node.param2}
local drop_stacks = {}
for k, v in pairs(drops) do
drop_stacks[k] = ItemStack(v)
end
drops = drop_stacks
def.preserve_metadata(pos_copy, node_copy, oldmeta, drops)
end
-- Handle drops
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core.handle_node_drops(pos, drops, digger)
local oldmetadata = nil
if def and def.after_dig_node then
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oldmetadata = core.get_meta(pos):to_table()
end
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-- Remove node and update
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core.remove_node(pos)
-- Play sound if it was done by a player
if diggername ~= "" and def and def.sounds and def.sounds.dug then
core.sound_play(def.sounds.dug, {
pos = pos,
exclude_player = diggername,
}, true)
end
-- Run callback
if def and def.after_dig_node then
-- 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}
def.after_dig_node(pos_copy, node_copy, oldmetadata, digger)
end
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-- Run script hook
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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)
end
-- 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}
callback(pos_copy, node_copy, digger)
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end
return true
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end
function core.itemstring_with_palette(item, palette_index)
local stack = ItemStack(item) -- convert to ItemStack
stack:get_meta():set_int("palette_index", palette_index)
return stack:to_string()
end
function core.itemstring_with_color(item, colorstring)
local stack = ItemStack(item) -- convert to ItemStack
stack:get_meta():set_string("color", colorstring)
return stack:to_string()
end
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-- 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
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--
-- Item definition defaults
--
local default_stack_max = tonumber(core.settings:get("default_stack_max")) or 99
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core.nodedef_default = {
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-- Item properties
type="node",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = vector.new(1, 1, 1),
stack_max = default_stack_max,
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usable = false,
liquids_pointable = false,
tool_capabilities = nil,
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node_placement_prediction = nil,
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-- Interaction callbacks
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on_place = redef_wrapper(core, 'item_place'), -- core.item_place
on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
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on_use = nil,
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can_dig = nil,
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on_punch = redef_wrapper(core, 'node_punch'), -- core.node_punch
on_rightclick = nil,
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on_dig = redef_wrapper(core, 'node_dig'), -- core.node_dig
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on_receive_fields = nil,
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-- 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},
--},
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post_effect_color = {a=0, r=0, g=0, b=0},
paramtype = "none",
paramtype2 = "none",
is_ground_content = true,
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sunlight_propagates = false,
walkable = true,
pointable = true,
diggable = true,
climbable = false,
buildable_to = false,
floodable = false,
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liquidtype = "none",
liquid_alternative_flowing = "",
liquid_alternative_source = "",
liquid_viscosity = 0,
drowning = 0,
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light_source = 0,
damage_per_second = 0,
selection_box = {type="regular"},
legacy_facedir_simple = false,
legacy_wallmounted = false,
}
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core.craftitemdef_default = {
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type="craft",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = vector.new(1, 1, 1),
stack_max = default_stack_max,
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liquids_pointable = false,
tool_capabilities = nil,
-- Interaction callbacks
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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'),
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on_use = nil,
}
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core.tooldef_default = {
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type="tool",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = vector.new(1, 1, 1),
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stack_max = 1,
liquids_pointable = false,
tool_capabilities = nil,
-- Interaction callbacks
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on_place = redef_wrapper(core, 'item_place'), -- core.item_place
on_secondary_use = redef_wrapper(core, 'item_secondary_use'),
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on_drop = redef_wrapper(core, 'item_drop'), -- core.item_drop
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on_use = nil,
}
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core.noneitemdef_default = { -- This is used for the hand and unknown items
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type="none",
-- name intentionally not defined here
description = "",
groups = {},
inventory_image = "",
wield_image = "",
wield_scale = vector.new(1, 1, 1),
stack_max = default_stack_max,
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liquids_pointable = false,
tool_capabilities = nil,
-- Interaction callbacks
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on_place = redef_wrapper(core, 'item_place'),
on_secondary_use = redef_wrapper(core, 'item_secondary_use'),
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on_drop = nil,
on_use = nil,
}