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//! This module implements the entity

//! metadata format. See <https://wiki.vg/Entity_metadata>

//! for the specification.

use crate::{Direction, ValidBlockPosition};

use bitflags::bitflags;

use libcraft_items::InventorySlot;

use std::collections::BTreeMap;

use uuid::Uuid;

pub type OptUuid = Option<Uuid>;

pub type OptChat = Option<String>;

pub type OptVarInt = Option<i32>;

// Meta index constants.

pub const META_INDEX_ENTITY_BITMASK: u8 = 0;

pub const META_INDEX_AIR: u8 = 1;

pub const META_INDEX_CUSTOM_NAME: u8 = 2;

pub const META_INDEX_IS_CUSTOM_NAME_VISIBLE: u8 = 3;

pub const META_INDEX_IS_SILENT: u8 = 4;

pub const META_INDEX_NO_GRAVITY: u8 = 5;

pub const META_INDEX_POSE: u8 = 6;

pub const META_INDEX_FALLING_BLOCK_SPAWN_POSITION: u8 = 7;

bitflags! {

pub struct EntityBitMask: u8 {

const ON_FIRE = 0x01;

const CROUCHED = 0x02;

const SPRINTING = 0x08;

const SWIMMING = 0x10;

const INVISIBLE = 0x20;

const GLOWING_EFFECT = 0x40;

const FLYING_WITH_ELYTRA = 0x80;

}

#[derive(Clone, Debug, PartialEq)]

pub enum MetaEntry {

Byte(i8),

VarInt(i32),

Float(f32),

String(String),

Chat(String),

OptChat(OptChat),

Slot(InventorySlot),

Boolean(bool),

Rotation(f32, f32, f32),

Position(ValidBlockPosition),

OptPosition(Option<ValidBlockPosition>),

Direction(Direction),

OptUuid(OptUuid),

OptBlockId(Option<i32>),

Nbt(nbt::Blob),

Particle,

VillagerData(i32, i32, i32),

OptVarInt(OptVarInt),

Pose(i32),

}

impl MetaEntry {

pub fn id(&self) -> i32 {

match self {

MetaEntry::Byte(_) => 0,

MetaEntry::VarInt(_) => 1,

MetaEntry::Float(_) => 2,

MetaEntry::String(_) => 3,

MetaEntry::Chat(_) => 4,

MetaEntry::OptChat(_) => 5,

MetaEntry::Slot(_) => 6,

MetaEntry::Boolean(_) => 7,

MetaEntry::Rotation(_, _, _) => 8,

MetaEntry::Position(_) => 9,

MetaEntry::OptPosition(_) => 10,

MetaEntry::Direction(_) => 11,

MetaEntry::OptUuid(_) => 12,

MetaEntry::OptBlockId(_) => 13,

MetaEntry::Nbt(_) => 14,

MetaEntry::Particle => 15,

MetaEntry::VillagerData(_, _, _) => 16,

MetaEntry::OptVarInt(_) => 17,

MetaEntry::Pose(_) => 18,

}

pub enum Pose {

Standing,

FallFlying,

Sleeping,

Swimming,

SpinAttack,

Sneaking,

Dying,

}

impl ToMetaEntry for Pose {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::Pose(match self {

Self::Standing => 0,

Self::FallFlying => 1,

Self::Sleeping => 2,

Self::Swimming => 3,

Self::SpinAttack => 4,

Self::Sneaking => 5,

Self::Dying => 6,

})

}

pub trait ToMetaEntry {

fn to_meta_entry(&self) -> MetaEntry;

}

impl ToMetaEntry for u8 {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::Byte(*self as i8)

}

impl ToMetaEntry for i8 {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::Byte(*self)

}

impl ToMetaEntry for i32 {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::VarInt(*self)

}

impl ToMetaEntry for f32 {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::Float(*self)

}

impl ToMetaEntry for OptChat {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::OptChat(self.clone())

}

impl ToMetaEntry for InventorySlot {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::Slot(self.clone())

}

impl ToMetaEntry for bool {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::Boolean(*self)

}

impl ToMetaEntry for ValidBlockPosition {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::Position(*self)

}

impl ToMetaEntry for OptUuid {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::OptUuid(*self)

}

impl ToMetaEntry for OptVarInt {

fn to_meta_entry(&self) -> MetaEntry {

MetaEntry::OptVarInt(*self)

}

#[derive(Clone, Debug)]

pub struct EntityMetadata {

pub values: BTreeMap<u8, MetaEntry>,

}

impl EntityMetadata {

pub fn new() -> Self {

Self {

values: BTreeMap::new(),

}

/// Returns an entity metadata with the defaults for an `Entity`.

pub fn entity_base() -> Self {

Self::new()

.with(META_INDEX_ENTITY_BITMASK, EntityBitMask::empty().bits())

.with(META_INDEX_AIR, 0i32)

.with(META_INDEX_CUSTOM_NAME, OptChat::None)

.with(META_INDEX_IS_CUSTOM_NAME_VISIBLE, false)

.with(META_INDEX_IS_SILENT, false)

.with(META_INDEX_NO_GRAVITY, false)

}

pub fn with_many(mut self, values: &[(u8, MetaEntry)]) -> Self {

for val in values {

self.values.insert(val.0, val.1.clone());

}

self

}

pub fn set(&mut self, index: u8, entry: impl ToMetaEntry) {

self.values.insert(index, entry.to_meta_entry());

}

pub fn with(mut self, index: u8, entry: impl ToMetaEntry) -> Self {

self.set(index, entry);

self

}

pub fn get(&self, index: u8) -> Option<MetaEntry> {

self.values.get(&index).cloned()

}

pub fn iter(&self) -> impl Iterator<Item = (u8, &MetaEntry)> {

self.values.iter().map(|(key, entry)| (*key, entry))

}

impl Default for EntityMetadata {

fn default() -> Self {

Self::new()

}

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metadata.rs

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