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430 lines (382 loc) · 12.3 KB
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//! Module for creating and modifying inventories of any type.
use feather_items::{Item, ItemStack};
use once_cell::sync::Lazy;
use smallvec::{Array, SmallVec};
use std::cmp::min;
pub type SlotIndex = usize;
// Constants representing various standard inventory slot indices
pub const SLOT_CRAFTING_OUTPUT: SlotIndex = 0;
pub const SLOT_CRAFTING_INPUT_X0_Y0: SlotIndex = 1;
pub const SLOT_CRAFTING_INPUT_X1_Y0: SlotIndex = 2;
pub const SLOT_CRAFTING_INPUT_X0_Y1: SlotIndex = 3;
pub const SLOT_CRAFTING_INPUT_X1_Y1: SlotIndex = 4;
pub const SLOT_ARMOR_MIN: SlotIndex = 5;
pub const SLOT_ARMOR_MAX: SlotIndex = 8;
pub const SLOT_ARMOR_HEAD: SlotIndex = 5;
pub const SLOT_ARMOR_CHEST: SlotIndex = 6;
pub const SLOT_ARMOR_LEGS: SlotIndex = 7;
pub const SLOT_ARMOR_FEET: SlotIndex = 8;
pub const SLOT_OFFHAND: SlotIndex = 45;
pub const SLOT_INVENTORY_OFFSET: SlotIndex = 9;
pub const SLOT_HOTBAR_OFFSET: SlotIndex = 36;
pub const HOTBAR_SIZE: SlotIndex = 9;
pub const INVENTORY_SIZE: SlotIndex = 27;
pub const SLOT_ENTITY_EQUIPMENT_MAIN_HAND: SlotIndex = 0;
pub const SLOT_ENTITY_EQUIPMENT_OFF_HAND: SlotIndex = 1;
pub const SLOT_ENTITY_EQUIPMENT_BOOTS: SlotIndex = 2;
pub const SLOT_ENTITY_EQUIPMENT_LEGGINGS: SlotIndex = 3;
pub const SLOT_ENTITY_EQUIPMENT_CHESTPLATE: SlotIndex = 4;
pub const SLOT_ENTITY_EQUIPMENT_HELMET: SlotIndex = 5;
pub type Slot = Option<ItemStack>;
static COLLECT_SEARCH_ORDER: Lazy<Vec<SlotIndex>> = Lazy::new(|| {
let mut result = vec![];
for x in SLOT_HOTBAR_OFFSET..SLOT_HOTBAR_OFFSET + HOTBAR_SIZE {
result.push(x);
}
for x in SLOT_INVENTORY_OFFSET..SLOT_INVENTORY_OFFSET + INVENTORY_SIZE {
result.push(x);
}
result
});
pub fn armor_slot_to_entity_equipment(slot: SlotIndex) -> SlotIndex {
assert!(slot >= 5 && slot <= 8);
match slot {
SLOT_ARMOR_HEAD => SLOT_ENTITY_EQUIPMENT_HELMET,
SLOT_ARMOR_CHEST => SLOT_ENTITY_EQUIPMENT_CHESTPLATE,
SLOT_ARMOR_LEGS => SLOT_ENTITY_EQUIPMENT_LEGGINGS,
SLOT_ARMOR_FEET => SLOT_ENTITY_EQUIPMENT_BOOTS,
_ => unreachable!(),
}
}
/// Returns the max size of a stack with the given
/// type.
pub fn max_size(item: Item) -> u8 {
match item {
Item::WoodenSword
| Item::GoldenSword
| Item::StoneSword
| Item::IronSword
| Item::DiamondSword
| Item::WoodenAxe
| Item::GoldenAxe
| Item::StoneAxe
| Item::IronAxe
| Item::DiamondAxe
| Item::WoodenHoe
| Item::GoldenHoe
| Item::StoneHoe
| Item::IronHoe
| Item::DiamondHoe
| Item::WoodenPickaxe
| Item::GoldenPickaxe
| Item::StonePickaxe
| Item::IronPickaxe
| Item::DiamondPickaxe
| Item::WoodenShovel
| Item::GoldenShovel
| Item::StoneShovel
| Item::IronShovel
| Item::DiamondShovel
| Item::LeatherChestplate
| Item::GoldenChestplate
| Item::ChainmailChestplate
| Item::IronChestplate
| Item::DiamondChestplate
| Item::LeatherLeggings
| Item::GoldenLeggings
| Item::ChainmailLeggings
| Item::IronLeggings
| Item::DiamondLeggings
| Item::LeatherBoots
| Item::GoldenBoots
| Item::ChainmailBoots
| Item::IronBoots
| Item::DiamondBoots
| Item::LeatherHelmet
| Item::GoldenHelmet
| Item::ChainmailHelmet
| Item::IronHelmet
| Item::DiamondHelmet
| Item::Bow
| Item::WritableBook
| Item::FlintAndSteel
| Item::WhiteBed
| Item::OrangeBed
| Item::MagentaBed
| Item::LightBlueBed
| Item::YellowBed
| Item::LimeBed
| Item::PinkBed
| Item::GrayBed
| Item::LightGrayBed
| Item::CyanBed
| Item::PurpleBed
| Item::BlueBed
| Item::BrownBed
| Item::GreenBed
| Item::RedBed
| Item::BlackBed
| Item::ShulkerBox
| Item::TurtleEgg
| Item::TurtleHelmet
| Item::FishingRod
| Item::EnchantedBook
| Item::Potion
| Item::LingeringPotion
| Item::SplashPotion
| Item::WaterBucket
| Item::LavaBucket
| Item::TropicalFishBucket
| Item::CodBucket
| Item::MilkBucket
| Item::PufferfishBucket
| Item::SalmonBucket
| Item::CarrotOnAStick
| Item::Elytra
| Item::Shield
| Item::Trident
| Item::MusicDisc13
| Item::MusicDiscCat
| Item::MusicDiscBlocks
| Item::MusicDiscChirp
| Item::MusicDiscFar
| Item::MusicDiscMall
| Item::MusicDiscMellohi
| Item::MusicDiscStal
| Item::MusicDiscStrad
| Item::MusicDiscWard
| Item::MusicDisc11
| Item::MusicDiscWait
| Item::TotemOfUndying
| Item::Shears
| Item::AcaciaBoat
| Item::DarkOakBoat
| Item::OakBoat
| Item::SpruceBoat
| Item::BirchBoat
| Item::JungleBoat
| Item::MushroomStew
| Item::BeetrootSoup
| Item::RabbitStew
| Item::Cake
| Item::Minecart
| Item::ChestMinecart
| Item::CommandBlockMinecart
| Item::FurnaceMinecart
| Item::HopperMinecart
| Item::TntMinecart
| Item::DiamondHorseArmor
| Item::GoldenHorseArmor
| Item::Saddle
| Item::KnowledgeBook
| Item::DebugStick
| Item::IronHorseArmor => 1,
Item::EnderPearl
| Item::Snowball
| Item::WhiteBanner
| Item::OrangeBanner
| Item::MagentaBanner
| Item::LightBlueBanner
| Item::YellowBanner
| Item::LimeBanner
| Item::PinkBanner
| Item::GrayBanner
| Item::LightGrayBanner
| Item::CyanBanner
| Item::PurpleBanner
| Item::BlueBanner
| Item::BrownBanner
| Item::GreenBanner
| Item::RedBanner
| Item::BlackBanner
| Item::Sign
| Item::ArmorStand
| Item::Bucket
| Item::WrittenBook
| Item::Egg => 16,
_ => 64,
}
}
/// The various types of inventories ("windows").
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum InventoryType {
Player,
Container,
Chest,
CraftingTable,
Furnace,
Dispenser,
EnchantingTable,
BrewingStand,
Villager,
Beacon,
Anvil,
Hopper,
Dropper,
ShulkerBox,
Horse,
}
/// An inventory, consisting of a vector
/// of `Slot`s and a type.
#[derive(Debug, Clone)]
pub struct Inventory {
/// The item vector.
///
/// The vector always contains an entry
/// for each slot in the inventory, indexed
/// by the slot IDs. When an entry is set to
/// `None`, there is no item in the slot.
items: Vec<Option<ItemStack>>,
/// The type of this inventory.
pub ty: InventoryType,
}
impl Inventory {
/// Creates a new inventory of the given
/// type and number of slots.
pub fn new(ty: InventoryType, num_slots: u32) -> Self {
Self {
items: vec![None; num_slots as usize],
ty,
}
}
/// Retrieves a reference to the item at the given slot index.
///
/// # Panics
/// Panics if the index is out of bounds.
pub fn item_at(&self, index: SlotIndex) -> Option<&ItemStack> {
self.items[index].as_ref()
}
pub fn item_at_mut(&mut self, index: SlotIndex) -> Option<&mut ItemStack> {
self.items[index].as_mut()
}
/// Sets the item at the given slot index.
pub fn set_item_at(&mut self, index: SlotIndex, item: ItemStack) {
if item.amount == 0 {
self.items[index] = None;
} else {
self.items[index] = Some(item);
}
}
/// Clears the item at the given slot index, returning
/// the old item.
pub fn clear_item_at(&mut self, index: SlotIndex) -> Option<ItemStack> {
self.items[index].take()
}
/// Attempts to insert the given item into a player
/// inventory.
///
/// Returns the affected slots and the number of remaining
/// items which were not added to the inventory.
pub fn collect_item(&mut self, mut item: ItemStack) -> (SmallVec<[SlotIndex; 2]>, u8) {
let mut affected_slots = SmallVec::new();
// First, look for slots already having the type.
for slot in COLLECT_SEARCH_ORDER.iter() {
if let Some(slot_item) = self.item_at(*slot).cloned() {
if slot_item.ty == item.ty {
self.add_to_stack(&mut item, slot_item, *slot, &mut affected_slots);
if item.amount == 0 {
return (affected_slots, 0);
}
}
}
}
for slot in COLLECT_SEARCH_ORDER.iter() {
let slot_item = self.item_at(*slot).cloned();
if slot_item.is_none() {
let fake = ItemStack::new(item.ty, 0);
self.add_to_stack(&mut item, fake, *slot, &mut affected_slots);
if item.amount == 0 {
return (affected_slots, 0);
}
}
if let Some(slot_item) = slot_item {
if slot_item.ty == item.ty {
self.add_to_stack(&mut item, slot_item, *slot, &mut affected_slots);
if item.amount == 0 {
return (affected_slots, 0);
}
}
}
}
(affected_slots, item.amount)
}
/// Adds an item to a stack.
fn add_to_stack<A: Array<Item = SlotIndex>>(
&mut self,
item: &mut ItemStack,
slot_item: ItemStack,
slot: SlotIndex,
affected_slots: &mut SmallVec<A>,
) {
let added = min(item.amount, max_size(item.ty) - slot_item.amount);
item.amount -= added;
self.set_item_at(slot, ItemStack::new(slot_item.ty, slot_item.amount + added));
affected_slots.push(slot);
}
/// Returns the number of slots in this inventory.
pub fn slot_count(&self) -> u16 {
self.items.len() as u16
}
/// Returns a reference to this inventory's items.
pub fn items(&self) -> &[Option<ItemStack>] {
&self.items
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_inventory() {
let mut inv = Inventory::new(InventoryType::Chest, 36);
assert_eq!(inv.slot_count(), 36);
inv.set_item_at(0, ItemStack::new(Item::Air, 1));
let item = inv.item_at(0).unwrap();
assert_eq!(item.ty, Item::Air);
assert_eq!(item.amount, 1);
let item = inv.item_at_mut(0).unwrap();
item.ty = Item::Sponge;
assert_eq!(inv.item_at(0).unwrap().ty, Item::Sponge);
inv.clear_item_at(0);
assert!(inv.item_at(0).is_none());
}
#[test]
fn test_collect_item_basic() {
let mut inv = Inventory::new(InventoryType::Player, 46);
let item = ItemStack::new(Item::Cobblestone, 32);
inv.collect_item(item.clone());
assert_eq!(inv.item_at(SLOT_HOTBAR_OFFSET).unwrap(), &item);
}
#[test]
fn test_collect_item_full() {
let mut inv = Inventory::new(InventoryType::Player, 46);
let item = ItemStack::new(Item::DriedKelpBlock, 64);
for i in 0..46 {
inv.set_item_at(i, item.clone());
}
inv.collect_item(ItemStack::new(Item::Cobblestone, 16));
for i in 0..46 {
assert_eq!(inv.item_at(i).unwrap(), &item);
}
}
#[test]
fn test_collect_item_type_already_in() {
let mut inv = Inventory::new(InventoryType::Player, 46);
let item = ItemStack::new(Item::Cobblestone, 33);
inv.set_item_at(31, item.clone());
inv.collect_item(item.clone());
assert_eq!(inv.item_at(31).unwrap(), &ItemStack::new(item.ty, 64));
assert_eq!(
inv.item_at(SLOT_HOTBAR_OFFSET).unwrap(),
&ItemStack::new(item.ty, 2)
);
}
#[test]
fn test_collect_item_overstack() {
let mut inv = Inventory::new(InventoryType::Player, 46);
let item = ItemStack::new(Item::DiamondSword, 1);
inv.set_item_at(SLOT_HOTBAR_OFFSET, item.clone());
inv.collect_item(item.clone());
assert_eq!(inv.item_at(SLOT_HOTBAR_OFFSET).unwrap(), &item);
assert_eq!(inv.item_at(SLOT_HOTBAR_OFFSET + 1).unwrap(), &item);
}
}
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