129 lines
3.7 KiB
Lua
129 lines
3.7 KiB
Lua
--[[
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Copyright (c) 2015, Robert 'Bobby' Zenz
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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--]]
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--- A util for working with inventories.
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inventoryutil = {}
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--- Gets the difference between the given inventory and the hash. The difference
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-- is returned in the same format as the hash, with the count being
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-- the amount of difference.
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--
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-- @param inventory The InvRef object.
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-- @param name The inventory name.
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-- @param hash The hash to compare against.
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-- @return The difference between the inventory and the hash.
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function inventoryutil.difference_hash(inventory, name, hash)
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local difference = {}
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for index = 1, inventory:get_size(name), 1 do
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local stack = inventory:get_stack(name, index)
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local item_hash = hash[index]
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local item_difference = {
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id = 0,
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count = 0
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}
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if item_hash.id >= 0 then
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item_difference.id = item_hash.id
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if not stack:is_empty() then
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if item_hash.id == minetest.get_content_id(stack:get_name()) then
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item_difference.count = stack:get_count() - item_hash.count
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else
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item_difference.count = -item_hash.count
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end
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else
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item_difference.count = -item_hash.count
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end
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end
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difference[index] = item_difference
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end
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return difference
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end
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--- Test if the given inventory equals the given hash.
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--
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-- @param inventory The InvRef object.
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-- @param name The name of the inventory.
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-- @param hash The hash.
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-- @return true If the inventory equals the hash.
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function inventoryutil.equals_hash(inventory, name, hash)
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if hash == nil then
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return false
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end
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for index = 1, inventory:get_size(name), 1 do
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local stack = inventory:get_stack(name, index)
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local item_hash = hash[index]
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if not stack:is_empty() then
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if item_hash.id ~= minetest.get_content_id(stack:get_name()) or item_hash.count ~= stack:get_count() then
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return false
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end
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else
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if item_hash.id >= 0 or item_hash.count ~= 0 then
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return false
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end
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end
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end
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return true
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end
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--- Creates a hash for the given inventory.
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-- The hash is a 2D table containing the ID and the stack count of all items.
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--
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-- @param inventory The InvRef object.
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-- @param name The name of the inventory.
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-- @return The hash.
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function inventoryutil.hash(inventory, name)
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local hash = {}
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for index = 1, inventory:get_size(name), 1 do
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local stack = inventory:get_stack(name, index)
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if not stack:is_empty() then
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hash[index] = {
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id = minetest.get_content_id(stack:get_name()),
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count = stack:get_count()
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}
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else
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hash[index] = {
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id = -1,
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count = 0
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}
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end
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end
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return hash
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end
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