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VoxeLibre/mods/CORE/mcl_util/init.lua

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Lua

mcl_util = {}
-- Updates all values in t using values from to*.
function table.update(t, ...)
for _, to in ipairs{...} do
for k,v in pairs(to) do
t[k] = v
end
end
return t
end
-- Updates nil values in t using values from to*.
function table.update_nil(t, ...)
for _, to in ipairs{...} do
for k,v in pairs(to) do
if t[k] == nil then
t[k] = v
end
end
end
return t
end
local LOGGING_ON = minetest.settings:get_bool("mcl_logging_default",false)
local LOG_MODULE = "[MCL2]"
function mcl_util.mcl_log (message, module, bypass_default_logger)
local selected_module = LOG_MODULE
if module then
selected_module = module
end
if (bypass_default_logger or LOGGING_ON) and message then
minetest.log(selected_module .. " " .. message)
end
end
function mcl_util.file_exists(name)
if type(name) ~= "string" then return end
local f = io.open(name)
if not f then
return false
end
f:close()
return true
end
-- Based on minetest.rotate_and_place
--[[
Attempt to predict the desired orientation of the pillar-like node
defined by `itemstack`, and place it accordingly in one of 3 possible
orientations (X, Y or Z).
Stacks are handled normally if the `infinitestacks`
field is false or omitted (else, the itemstack is not changed).
* `invert_wall`: if `true`, place wall-orientation on the ground and ground-
orientation on wall
This function is a simplified version of minetest.rotate_and_place.
The Minetest function is seen as inappropriate because this includes mirror
images of possible orientations, causing problems with pillar shadings.
]]
function mcl_util.rotate_axis_and_place(itemstack, placer, pointed_thing, infinitestacks, invert_wall)
local unode = minetest.get_node_or_nil(pointed_thing.under)
if not unode then
return
end
local undef = minetest.registered_nodes[unode.name]
if undef and undef.on_rightclick then
undef.on_rightclick(pointed_thing.under, unode, placer,
itemstack, pointed_thing)
return
end
local fdir = minetest.dir_to_facedir(placer:get_look_dir())
local wield_name = itemstack:get_name()
local above = pointed_thing.above
local under = pointed_thing.under
local is_x = (above.x ~= under.x)
local is_y = (above.y ~= under.y)
local is_z = (above.z ~= under.z)
local anode = minetest.get_node_or_nil(above)
if not anode then
return
end
local pos = pointed_thing.above
local node = anode
if undef and undef.buildable_to then
pos = pointed_thing.under
node = unode
end
if minetest.is_protected(pos, placer:get_player_name()) then
minetest.record_protection_violation(pos, placer:get_player_name())
return
end
local ndef = minetest.registered_nodes[node.name]
if not ndef or not ndef.buildable_to then
return
end
local p2
if is_y then
if invert_wall then
if fdir == 3 or fdir == 1 then
p2 = 12
else
p2 = 6
end
end
elseif is_x then
if invert_wall then
p2 = 0
else
p2 = 12
end
elseif is_z then
if invert_wall then
p2 = 0
else
p2 = 6
end
end
minetest.set_node(pos, {name = wield_name, param2 = p2})
if not infinitestacks then
itemstack:take_item()
return itemstack
end
end
-- Wrapper of above function for use as `on_place` callback (Recommended).
-- Similar to minetest.rotate_node.
function mcl_util.rotate_axis(itemstack, placer, pointed_thing)
mcl_util.rotate_axis_and_place(itemstack, placer, pointed_thing,
minetest.is_creative_enabled(placer:get_player_name()),
placer:get_player_control().sneak)
return itemstack
end
-- Returns position of the neighbor of a double chest node
-- or nil if node is invalid.
-- This function assumes that the large chest is actually intact
-- * pos: Position of the node to investigate
-- * param2: param2 of that node
-- * side: Which "half" the investigated node is. "left" or "right"
function mcl_util.get_double_container_neighbor_pos(pos, param2, side)
if side == "right" then
if param2 == 0 then
return {x=pos.x-1, y=pos.y, z=pos.z}
elseif param2 == 1 then
return {x=pos.x, y=pos.y, z=pos.z+1}
elseif param2 == 2 then
return {x=pos.x+1, y=pos.y, z=pos.z}
elseif param2 == 3 then
return {x=pos.x, y=pos.y, z=pos.z-1}
end
else
if param2 == 0 then
return {x=pos.x+1, y=pos.y, z=pos.z}
elseif param2 == 1 then
return {x=pos.x, y=pos.y, z=pos.z-1}
elseif param2 == 2 then
return {x=pos.x-1, y=pos.y, z=pos.z}
elseif param2 == 3 then
return {x=pos.x, y=pos.y, z=pos.z+1}
end
end
end
-- Iterates through all items in the given inventory and
-- returns the slot of the first item which matches a condition.
-- Returns nil if no item was found.
--- source_inventory: Inventory to take the item from
--- source_list: List name of the source inventory from which to take the item
--- destination_inventory: Put item into this inventory
--- destination_list: List name of the destination inventory to which to put the item into
--- condition: Function which takes an itemstack and returns true if it matches the desired item condition.
--- If set to nil, the slot of the first item stack will be taken unconditionally.
-- dst_inventory and dst_list can also be nil if condition is nil.
function mcl_util.get_eligible_transfer_item_slot(src_inventory, src_list, dst_inventory, dst_list, condition)
local size = src_inventory:get_size(src_list)
local stack
for i=1, size do
stack = src_inventory:get_stack(src_list, i)
if not stack:is_empty() and (condition == nil or condition(stack, src_inventory, src_list, dst_inventory, dst_list)) then
return i
end
end
return nil
end
-- Returns true if itemstack is a shulker box
local function is_not_shulker_box(itemstack)
local g = minetest.get_item_group(itemstack:get_name(), "shulker_box")
return g == 0 or g == nil
end
-- Moves a single item from one inventory to another.
--- source_inventory: Inventory to take the item from
--- source_list: List name of the source inventory from which to take the item
--- source_stack_id: The inventory position ID of the source inventory to take the item from (-1 for first occupied slot)
--- destination_inventory: Put item into this inventory
--- destination_list: List name of the destination inventory to which to put the item into
-- Returns true on success and false on failure
-- Possible failures: No item in source slot, destination inventory full
function mcl_util.move_item(source_inventory, source_list, source_stack_id, destination_inventory, destination_list)
if source_stack_id == -1 then
source_stack_id = mcl_util.get_first_occupied_inventory_slot(source_inventory, source_list)
if source_stack_id == nil then
return false
end
end
if not source_inventory:is_empty(source_list) then
local stack = source_inventory:get_stack(source_list, source_stack_id)
if not stack:is_empty() then
local new_stack = ItemStack(stack)
new_stack:set_count(1)
if not destination_inventory:room_for_item(destination_list, new_stack) then
return false
end
stack:take_item()
source_inventory:set_stack(source_list, source_stack_id, stack)
destination_inventory:add_item(destination_list, new_stack)
return true
end
end
return false
end
-- Moves a single item from one container node into another. Performs a variety of high-level
-- checks to prevent invalid transfers such as shulker boxes into shulker boxes
--- source_pos: Position ({x,y,z}) of the node to take the item from
--- destination_pos: Position ({x,y,z}) of the node to put the item into
--- source_list (optional): List name of the source inventory from which to take the item. Default is normally "main"; "dst" for furnace
--- source_stack_id (optional): The inventory position ID of the source inventory to take the item from (-1 for slot of the first valid item; -1 is default)
--- destination_list (optional): List name of the destination inventory. Default is normally "main"; "src" for furnace
-- Returns true on success and false on failure.
function mcl_util.move_item_container(source_pos, destination_pos, source_list, source_stack_id, destination_list)
local dpos = table.copy(destination_pos)
local spos = table.copy(source_pos)
local snode = minetest.get_node(spos)
local dnode = minetest.get_node(dpos)
local dctype = minetest.get_item_group(dnode.name, "container")
local sctype = minetest.get_item_group(snode.name, "container")
-- Container type 7 does not allow any movement
if sctype == 7 then
return false
end
-- Normalize double container by forcing to always use the left segment first
local function normalize_double_container(pos, node, ctype)
if ctype == 6 then
pos = mcl_util.get_double_container_neighbor_pos(pos, node.param2, "right")
if not pos then
return false
end
node = minetest.get_node(pos)
ctype = minetest.get_item_group(node.name, "container")
-- The left segment seems incorrect? We better bail out!
if ctype ~= 5 then
return false
end
end
return pos, node, ctype
end
spos, snode, sctype = normalize_double_container(spos, snode, sctype)
dpos, dnode, dctype = normalize_double_container(dpos, dnode, dctype)
if not spos or not dpos then return false end
local smeta = minetest.get_meta(spos)
local dmeta = minetest.get_meta(dpos)
local sinv = smeta:get_inventory()
local dinv = dmeta:get_inventory()
-- Default source lists
if not source_list then
-- Main inventory for most container types
if sctype == 2 or sctype == 3 or sctype == 5 or sctype == 6 or sctype == 7 then
source_list = "main"
-- Furnace: output
elseif sctype == 4 then
source_list = "dst"
-- Unknown source container type. Bail out
else
return false
end
end
-- Automatically select stack slot ID if set to automatic
if not source_stack_id then
source_stack_id = -1
end
if source_stack_id == -1 then
local cond = nil
-- Prevent shulker box inception
if dctype == 3 then
cond = is_not_shulker_box
end
source_stack_id = mcl_util.get_eligible_transfer_item_slot(sinv, source_list, dinv, dpos, cond)
if not source_stack_id then
-- Try again if source is a double container
if sctype == 5 then
spos = mcl_util.get_double_container_neighbor_pos(spos, snode.param2, "left")
smeta = minetest.get_meta(spos)
sinv = smeta:get_inventory()
source_stack_id = mcl_util.get_eligible_transfer_item_slot(sinv, source_list, dinv, dpos, cond)
if not source_stack_id then
return false
end
else
return false
end
end
end
-- Abort transfer if shulker box wants to go into shulker box
if dctype == 3 then
local stack = sinv:get_stack(source_list, source_stack_id)
if stack and minetest.get_item_group(stack:get_name(), "shulker_box") == 1 then
return false
end
end
-- Container type 7 does not allow any placement
if dctype == 7 then
return false
end
-- If it's a container, put it into the container
if dctype ~= 0 then
-- Automatically select a destination list if omitted
if not destination_list then
-- Main inventory for most container types
if dctype == 2 or dctype == 3 or dctype == 5 or dctype == 6 or dctype == 7 then
destination_list = "main"
-- Furnace source slot
elseif dctype == 4 then
destination_list = "src"
end
end
if destination_list then
-- Move item
local ok = mcl_util.move_item(sinv, source_list, source_stack_id, dinv, destination_list)
-- Try transfer to neighbor node if transfer failed and double container
if not ok and dctype == 5 then
dpos = mcl_util.get_double_container_neighbor_pos(dpos, dnode.param2, "left")
dmeta = minetest.get_meta(dpos)
dinv = dmeta:get_inventory()
ok = mcl_util.move_item(sinv, source_list, source_stack_id, dinv, destination_list)
end
-- Update furnace
if ok and dctype == 4 then
-- Start furnace's timer function, it will sort out whether furnace can burn or not.
minetest.get_node_timer(dpos):start(1.0)
end
return ok
end
end
return false
end
-- Returns the ID of the first non-empty slot in the given inventory list
-- or nil, if inventory is empty.
function mcl_util.get_first_occupied_inventory_slot(inventory, listname)
return mcl_util.get_eligible_transfer_item_slot(inventory, listname)
end
local function drop_item_stack(pos, stack)
if not stack or stack:is_empty() then return end
local drop_offset = vector.new(math.random() - 0.5, 0, math.random() - 0.5)
minetest.add_item(vector.add(pos, drop_offset), stack)
end
function mcl_util.drop_items_from_meta_container(listname)
return function(pos, oldnode, oldmetadata)
if oldmetadata and oldmetadata.inventory then
-- process in after_dig_node callback
local main = oldmetadata.inventory.main
if not main then return end
for _, stack in pairs(main) do
drop_item_stack(pos, stack)
end
else
local meta = minetest.get_meta(pos)
local inv = meta:get_inventory()
for i = 1, inv:get_size("main") do
drop_item_stack(pos, inv:get_stack("main", i))
end
meta:from_table()
end
end
end
-- Returns true if item (itemstring or ItemStack) can be used as a furnace fuel.
-- Returns false otherwise
function mcl_util.is_fuel(item)
return minetest.get_craft_result({method="fuel", width=1, items={item}}).time ~= 0
end
-- Returns a on_place function for plants
-- * condition: function(pos, node, itemstack)
-- * A function which is called by the on_place function to check if the node can be placed
-- * Must return true, if placement is allowed, false otherwise.
-- * If it returns a string, placement is allowed, but will place this itemstring as a node instead
-- * pos, node: Position and node table of plant node
-- * itemstack: Itemstack to place
function mcl_util.generate_on_place_plant_function(condition)
return function(itemstack, placer, pointed_thing)
if pointed_thing.type ~= "node" then
-- no interaction possible with entities
return itemstack
end
-- Call on_rightclick if the pointed node defines it
local node = minetest.get_node(pointed_thing.under)
if placer and not placer:get_player_control().sneak then
if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_rightclick then
return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, placer, itemstack) or itemstack
end
end
local place_pos
local def_under = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name]
local def_above = minetest.registered_nodes[minetest.get_node(pointed_thing.above).name]
if not def_under or not def_above then
return itemstack
end
if def_under.buildable_to then
place_pos = pointed_thing.under
elseif def_above.buildable_to then
place_pos = pointed_thing.above
else
return itemstack
end
-- Check placement rules
local result, param2 = condition(place_pos, node, itemstack)
if result == true then
local idef = itemstack:get_definition()
local new_itemstack, success = minetest.item_place_node(itemstack, placer, pointed_thing, param2)
if success then
if idef.sounds and idef.sounds.place then
minetest.sound_play(idef.sounds.place, {pos=pointed_thing.above, gain=1}, true)
end
end
itemstack = new_itemstack
end
return itemstack
end
end
-- adjust the y level of an object to the center of its collisionbox
-- used to get the origin position of entity explosions
function mcl_util.get_object_center(obj)
local collisionbox = obj:get_properties().collisionbox
local pos = obj:get_pos()
local ymin = collisionbox[2]
local ymax = collisionbox[5]
pos.y = pos.y + (ymax - ymin) / 2.0
return pos
end
function mcl_util.get_color(colorstr)
local mc_color = mcl_colors[colorstr:upper()]
if mc_color then
colorstr = mc_color
elseif #colorstr ~= 7 or colorstr:sub(1, 1) ~= "#" then
return
end
local hex = tonumber(colorstr:sub(2, 7), 16)
if hex then
return colorstr, hex
end
end
function mcl_util.call_on_rightclick(itemstack, player, pointed_thing)
-- Call on_rightclick if the pointed node defines it
if pointed_thing and pointed_thing.type == "node" then
local pos = pointed_thing.under
local node = minetest.get_node(pos)
if player and not player:get_player_control().sneak then
local nodedef = minetest.registered_nodes[node.name]
local on_rightclick = nodedef and nodedef.on_rightclick
if on_rightclick then
return on_rightclick(pos, node, player, itemstack, pointed_thing) or itemstack
end
end
end
end
function mcl_util.calculate_durability(itemstack)
local unbreaking_level = mcl_enchanting.get_enchantment(itemstack, "unbreaking")
local armor_uses = minetest.get_item_group(itemstack:get_name(), "mcl_armor_uses")
local uses
if armor_uses > 0 then
uses = armor_uses
if unbreaking_level > 0 then
uses = uses / (0.6 + 0.4 / (unbreaking_level + 1))
end
else
local def = itemstack:get_definition()
if def then
local fixed_uses = def._mcl_uses
if fixed_uses then
uses = fixed_uses
if unbreaking_level > 0 then
uses = uses * (unbreaking_level + 1)
end
end
end
local _, groupcap = next(itemstack:get_tool_capabilities().groupcaps)
uses = uses or (groupcap or {}).uses
end
return uses or 0
end
function mcl_util.use_item_durability(itemstack, n)
local uses = mcl_util.calculate_durability(itemstack)
itemstack:add_wear(65535 / uses * n)
end
function mcl_util.deal_damage(target, damage, mcl_reason)
local luaentity = target:get_luaentity()
if luaentity then
if luaentity.deal_damage then
luaentity:deal_damage(damage, mcl_reason or {type = "generic"})
return
elseif luaentity.is_mob then
-- local puncher = mcl_reason and mcl_reason.direct or target
-- target:punch(puncher, 1.0, {full_punch_interval = 1.0, damage_groups = {fleshy = damage}}, vector.direction(puncher:get_pos(), target:get_pos()), damage)
if luaentity.health > 0 then
luaentity.health = luaentity.health - damage
end
return
end
end
local hp = target:get_hp()
if hp > 0 then
target:set_hp(hp - damage, {_mcl_reason = mcl_reason})
end
end
function mcl_util.get_hp(obj)
local luaentity = obj:get_luaentity()
if luaentity and luaentity.is_mob then
return luaentity.health
else
return obj:get_hp()
end
end
function mcl_util.get_inventory(object, create)
if object:is_player() then
return object:get_inventory()
else
local luaentity = object:get_luaentity()
local inventory = luaentity.inventory
if create and not inventory and luaentity.create_inventory then
inventory = luaentity:create_inventory()
end
return inventory
end
end
function mcl_util.get_wielded_item(object)
if object:is_player() then
return object:get_wielded_item()
else
-- ToDo: implement getting wielditems from mobs as soon as mobs have wielditems
return ItemStack()
end
end
function mcl_util.get_object_name(object)
if object:is_player() then
return object:get_player_name()
else
local luaentity = object:get_luaentity()
if not luaentity then
return tostring(object)
end
return luaentity.nametag and luaentity.nametag ~= "" and luaentity.nametag or luaentity.description or luaentity.name
end
end
function mcl_util.replace_mob(obj, mob)
if not obj then return end
local rot = obj:get_yaw()
local pos = obj:get_pos()
obj:remove()
obj = minetest.add_entity(pos, mob)
if not obj then return end
obj:set_yaw(rot)
return obj
end
function mcl_util.get_pointed_thing(player, liquid)
local pos = vector.offset(player:get_pos(), 0, player:get_properties().eye_height, 0)
local look_dir = vector.multiply(player:get_look_dir(), 5)
local pos2 = vector.add(pos, look_dir)
local ray = minetest.raycast(pos, pos2, false, liquid)
if ray then
for pointed_thing in ray do
return pointed_thing
end
end
end
-- This following part is 2 wrapper functions + helpers for
-- object:set_bones
-- and player:set_properties preventing them from being resent on
-- every globalstep when they have not changed.
local function roundN(n, d)
if type(n) ~= "number" then return n end
local m = 10^d
return math.floor(n * m + 0.5) / m
end
local function close_enough(a,b)
local rt=true
if type(a) == "table" and type(b) == "table" then
for k,v in pairs(a) do
if roundN(v,2) ~= roundN(b[k],2) then
rt=false
break
end
end
else
rt = roundN(a,2) == roundN(b,2)
end
return rt
end
local function props_changed(props,oldprops)
local changed=false
local p={}
for k,v in pairs(props) do
if not close_enough(v,oldprops[k]) then
p[k]=v
changed=true
end
end
return changed,p
end
--tests for roundN
local test_round1=15
local test_round2=15.00199999999
local test_round3=15.00111111
local test_round4=15.00999999
assert(roundN(test_round1,2)==roundN(test_round1,2))
assert(roundN(test_round1,2)==roundN(test_round2,2))
assert(roundN(test_round1,2)==roundN(test_round3,2))
assert(roundN(test_round1,2)~=roundN(test_round4,2))
-- tests for close_enough
local test_cb = {-0.35,0,-0.35,0.35,0.8,0.35} --collisionboxes
local test_cb_close = {-0.351213,0,-0.35,0.35,0.8,0.351212}
local test_cb_diff = {-0.35,0,-1.35,0.35,0.8,0.35}
local test_eh = 1.65 --eye height
local test_eh_close = 1.65123123
local test_eh_diff = 1.35
local test_nt = { r = 225, b = 225, a = 225, g = 225 } --nametag
local test_nt_diff = { r = 225, b = 225, a = 0, g = 225 }
assert(close_enough(test_cb,test_cb_close))
assert(not close_enough(test_cb,test_cb_diff))
assert(close_enough(test_eh,test_eh_close))
assert(not close_enough(test_eh,test_eh_diff))
assert(not close_enough(test_nt,test_nt_diff)) --no floats involved here
--tests for properties_changed
local test_properties_set1={collisionbox = {-0.35,0,-0.35,0.35,0.8,0.35}, eye_height = 0.65, nametag_color = { r = 225, b = 225, a = 225, g = 225 }}
local test_properties_set2={collisionbox = {-0.35,0,-0.35,0.35,0.8,0.35}, eye_height = 1.35, nametag_color = { r = 225, b = 225, a = 225, g = 225 }}
local test_p1,_=props_changed(test_properties_set1,test_properties_set1)
local test_p2,_=props_changed(test_properties_set1,test_properties_set2)
assert(not test_p1)
assert(test_p2)
function mcl_util.set_properties(obj,props)
local changed,p=props_changed(props,obj:get_properties())
if changed then
obj:set_properties(p)
end
end
function mcl_util.set_bone_position(obj, bone, pos, rot)
local current_pos, current_rot = obj:get_bone_position(bone)
local pos_equal = not pos or vector.equals(vector.round(current_pos), vector.round(pos))
local rot_equal = not rot or vector.equals(vector.round(current_rot), vector.round(rot))
if not pos_equal or not rot_equal then
obj:set_bone_position(bone, pos or current_pos, rot or current_rot)
end
end
--[[Check for a protection violation in a given area.
--
-- Applies is_protected() to a 3D lattice of points in the defined volume. The points are spaced
-- evenly throughout the volume and have a spacing similar to, but no larger than, "interval".
--
-- @param pos1 A position table of the area volume's first edge.
-- @param pos2 A position table of the area volume's second edge.
-- @param player The player performing the action.
-- @param interval Optional. Max spacing between checked points at the volume.
-- Default: Same as minetest.is_area_protected.
--
-- @return true on protection violation detection. false otherwise.
--
-- @notes *All corners and edges of the defined volume are checked.
]]
function mcl_util.check_area_protection(pos1, pos2, player, interval)
local name = player and player:get_player_name() or ""
local protected_pos = minetest.is_area_protected(pos1, pos2, name, interval)
if protected_pos then
minetest.record_protection_violation(protected_pos, name)
return true
end
return false
end
--[[Check for a protection violation on a single position.
--
-- @param position A position table to check for protection violation.
-- @param player The player performing the action.
--
-- @return true on protection violation detection. false otherwise.
]]
function mcl_util.check_position_protection(position, player)
local name = player and player:get_player_name() or ""
if minetest.is_protected(position, name) then
minetest.record_protection_violation(position, name)
return true
end
return false
end