Initial work on creating a WASM interface for PkmnLibRs

.cargo/config.toml

@@ -0,0 +1,3 @@
+[build]
+target = "wasm32-unknown-unknown"
+rustflags = ["-C", "target-feature=+reference-types,+multivalue"]

.gitignore

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+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+.idea

Cargo.toml

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+[workspace]
+
+members = [
+    "pkmn_lib_interface",
+    "gen_7_scripts"
+]
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
+lto = false
+debug-assertions = true

gen_7_scripts/Cargo.toml

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+[package]
+name = "gen7_scripts"
+version = "0.1.0"
+authors = ["Deukhoofd <Deukhoofd@gmail.com>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+pkmn_lib_interface = { path = "../pkmn_lib_interface" }

gen_7_scripts/src/lib.rs

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+#![feature(inline_const)]
+#![feature(inline_const_pat)]
+#![feature(wasm_abi)]
+#![no_std]
+#![allow(incomplete_features)]
+
+extern crate alloc;
+
+use alloc::boxed::Box;
+use pkmn_lib_interface::set_load_script_fn;
+
+#[macro_use]
+
+pub mod registered_scripts;
+pub mod test_script;
+
+#[no_mangle]
+extern "wasm" fn _init() {
+    set_load_script_fn(Box::new(registered_scripts::get_script));
+}

gen_7_scripts/src/registered_scripts.rs

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+use crate::test_script::TestScript;
+use alloc::boxed::Box;
+use pkmn_lib_interface::app_interface::{get_hash, StringKey};
+use pkmn_lib_interface::handling::{Script, ScriptCategory};
+
+macro_rules! resolve_match {
+    (
+        $mid:expr,
+        $(
+            $key:expr => $script:ident,
+        )*
+    ) => (
+        match $mid {
+            $(
+                const { get_hash($key) } => {
+                    return Some(Box::new($script {}))
+                }
+            )*
+            _ => {}
+        }
+    )
+}
+
+pub fn get_script(category: ScriptCategory, name: &StringKey) -> Option<Box<dyn Script>> {
+    match category {
+        ScriptCategory::Move => {
+            resolve_match!(
+                name.hash(),
+                b"test" => TestScript,
+            );
+        }
+        ScriptCategory::Ability => {}
+        ScriptCategory::Status => {}
+        ScriptCategory::Pokemon => {}
+        ScriptCategory::Battle => {}
+        ScriptCategory::Side => {}
+        ScriptCategory::ItemBattleTrigger => {}
+    }
+
+    None
+}

gen_7_scripts/src/test_script.rs

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+use pkmn_lib_interface::app_interface::list::ImmutableList;
+use pkmn_lib_interface::app_interface::{get_hash, BattleLibrary, DataLibrary, EffectParameter};
+use pkmn_lib_interface::dbg;
+use pkmn_lib_interface::handling::{Script, ScriptCapabilities};
+
+pub struct TestScript {}
+
+impl Script for TestScript {
+    fn new() -> Self {
+        TestScript {}
+    }
+    fn destroy(&self) {}
+
+    fn get_name(&self) -> &str {
+        "TestScript"
+    }
+
+    fn get_capabilities(&self) -> &[ScriptCapabilities] {
+        &[ScriptCapabilities::Initialize]
+    }
+
+    fn on_initialize(
+        &self,
+        library: &BattleLibrary,
+        parameters: Option<ImmutableList<EffectParameter>>,
+    ) {
+        let l = library.data_library();
+        let ml = l.move_library();
+        let m = ml.get_by_hash(const { get_hash(b"tackle") }).unwrap();
+        dbg!("found move!");
+        dbg!("{:?} has {} base power", m.name().str(), m.base_power());
+        dbg!(
+            "Found a parameter with value: {}",
+            parameters.unwrap().get(0).unwrap()
+        )
+    }
+}

pkmn_lib_interface/Cargo.toml

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+[package]
+name = "pkmn_lib_interface"
+version = "0.1.0"
+authors = ["Deukhoofd <Deukhoofd@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+wee_alloc = "0.4.5"
+cstr_core = { version = "0.2.5", features = ["nightly"]}
+lazy_static = { version = "1.4.0", features = ["spin_no_std"] }
+enumflags2 = { version = "0.7.5", default-features = false }
+spin = { version = "0.9.4", default-features = false, features = ["rwlock"] }
+paste = { version = "1.0.7" }
+
+[dev-dependencies]
+
+[profile.dev]
+lto = false
+

pkmn_lib_interface/src/app_interface/battling/battle_library.rs

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+use crate::app_interface::StaticData;
+use crate::{impl_extern_ctor, ExternRef};
+
+pub struct BattleLibrary {
+    ptr: ExternRef<BattleLibrary>,
+}
+
+impl_extern_ctor!(BattleLibrary);
+
+impl BattleLibrary {
+    pub fn data_library(&self) -> StaticData {
+        unsafe { StaticData::new(battle_library_get_static_data(self.ptr)) }
+    }
+}
+
+extern "wasm" {
+    fn battle_library_get_static_data(ptr: ExternRef<BattleLibrary>) -> ExternRef<StaticData>;
+}

pkmn_lib_interface/src/app_interface/battling/mod.rs

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+mod battle_library;
+mod turn_choices;
+
+pub use battle_library::BattleLibrary;
+pub use turn_choices::*;

pkmn_lib_interface/src/app_interface/battling/turn_choices.rs

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+pub struct BaseTurnChoice {}

pkmn_lib_interface/src/app_interface/library/data_libraries/item_library.rs

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+use crate::app_interface::{DataLibrary, Item};
+use crate::handling::Cacheable;
+use crate::{ExternRef, StringKey};
+use alloc::collections::BTreeMap;
+use alloc::rc::Rc;
+use spin::rwlock::RwLock;
+
+struct ItemLibraryInner {
+    ptr: ExternRef<ItemLibrary>,
+    cache: RwLock<BTreeMap<u32, Item>>,
+}
+
+#[derive(Clone)]
+pub struct ItemLibrary {
+    inner: Rc<ItemLibraryInner>,
+}
+
+impl ItemLibrary {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+        Self {
+            inner: Rc::new(ItemLibraryInner {
+                ptr,
+                cache: Default::default(),
+            }),
+        }
+    }
+}
+
+impl DataLibrary<Item> for ItemLibrary {
+    fn get_cache(&self) -> &spin::rwlock::RwLock<BTreeMap<u32, Item>> {
+        &self.inner.cache
+    }
+
+    fn get_self_ref(&self) -> ExternRef<Self> {
+        self.inner.ptr.clone()
+    }
+
+    fn _get_ref_by_name(ptr: ExternRef<Self>, name: ExternRef<StringKey>) -> ExternRef<Item> {
+        unsafe { move_library_get_move(ptr, name) }
+    }
+
+    fn _get_ref_by_hash(ptr: ExternRef<Self>, hash: u32) -> ExternRef<Item> {
+        unsafe { move_library_get_move_by_hash(ptr, hash) }
+    }
+}
+
+impl Cacheable for ItemLibrary {
+    fn get_cache<'a>() -> &'a mut BTreeMap<ExternRef<Self>, Self>
+    where
+        Self: Sized,
+    {
+        unsafe { &mut CACHE }
+    }
+}
+
+static mut CACHE: BTreeMap<ExternRef<ItemLibrary>, ItemLibrary> = BTreeMap::new();
+
+extern "wasm" {
+    fn move_library_get_move(
+        ptr: ExternRef<ItemLibrary>,
+        name: ExternRef<StringKey>,
+    ) -> ExternRef<Item>;
+    fn move_library_get_move_by_hash(ptr: ExternRef<ItemLibrary>, hash: u32) -> ExternRef<Item>;
+}

pkmn_lib_interface/src/app_interface/library/data_libraries/mod.rs

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+use crate::{impl_extern_ctor, ExternRef, ExternalReferenceType, StringKey};
+use alloc::collections::BTreeMap;
+use move_library::MoveLibrary;
+use spin::rwlock::RwLock;
+
+pub mod item_library;
+pub mod move_library;
+
+use crate::handling::Cacheable;
+pub use item_library::*;
+pub use move_library::*;
+
+pub struct StaticData {
+    ptr: ExternRef<Self>,
+}
+
+impl_extern_ctor!(StaticData);
+impl StaticData {
+    pub fn move_library(&self) -> MoveLibrary {
+        unsafe { MoveLibrary::new(static_data_get_move_library(self.ptr)) }
+    }
+}
+
+extern "wasm" {
+    fn static_data_get_move_library(ptr: ExternRef<StaticData>) -> ExternRef<MoveLibrary>;
+}
+
+pub trait DataLibrary<T>: Cacheable
+where
+    T: ExternalReferenceType,
+    T: Clone,
+{
+    fn get_cache(&self) -> &RwLock<BTreeMap<u32, T>>;
+    fn get_self_ref(&self) -> ExternRef<Self>
+    where
+        Self: Sized;
+    fn _get_ref_by_name(ptr: ExternRef<Self>, name: ExternRef<StringKey>) -> ExternRef<T>
+    where
+        Self: Sized;
+    fn _get_ref_by_hash(ptr: ExternRef<Self>, hash: u32) -> ExternRef<T>
+    where
+        Self: Sized;
+
+    fn get(&self, name: &StringKey) -> Option<T>
+    where
+        Self: Sized,
+    {
+        if let Some(v) = self.get_cache().read().get(&name.hash()) {
+            return Some(v.clone());
+        }
+
+        let v = Self::_get_ref_by_name(self.get_self_ref(), name.ptr()).get_value();
+        if let Some(v) = &v {
+            self.get_cache().write().insert(name.hash(), v.clone());
+        }
+        v
+    }
+
+    fn get_by_hash(&self, hash: u32) -> Option<T>
+    where
+        Self: Sized,
+    {
+        if let Some(v) = self.get_cache().read().get(&hash) {
+            return Some(v.clone());
+        }
+
+        let v = Self::_get_ref_by_hash(self.get_self_ref(), hash).get_value();
+        if let Some(v) = &v {
+            self.get_cache().write().insert(hash, v.clone());
+        }
+        v
+    }
+}

pkmn_lib_interface/src/app_interface/library/data_libraries/move_library.rs

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+use crate::app_interface::data_libraries::DataLibrary;
+use crate::app_interface::{MoveData, StringKey};
+use crate::handling::Cacheable;
+use crate::ExternRef;
+use alloc::collections::BTreeMap;
+use alloc::rc::Rc;
+use spin::RwLock;
+
+struct MoveLibraryInner {
+    ptr: ExternRef<MoveLibrary>,
+    cache: RwLock<BTreeMap<u32, MoveData>>,
+}
+
+#[derive(Clone)]
+pub struct MoveLibrary {
+    inner: Rc<MoveLibraryInner>,
+}
+
+impl MoveLibrary {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+        Self {
+            inner: Rc::new(MoveLibraryInner {
+                ptr,
+                cache: Default::default(),
+            }),
+        }
+    }
+}
+
+impl DataLibrary<MoveData> for MoveLibrary {
+    fn get_cache(&self) -> &spin::rwlock::RwLock<BTreeMap<u32, MoveData>> {
+        &self.inner.cache
+    }
+
+    fn get_self_ref(&self) -> ExternRef<Self> {
+        self.inner.ptr.clone()
+    }
+
+    fn _get_ref_by_name(ptr: ExternRef<Self>, name: ExternRef<StringKey>) -> ExternRef<MoveData> {
+        unsafe { move_library_get_move(ptr, name) }
+    }
+
+    fn _get_ref_by_hash(ptr: ExternRef<Self>, hash: u32) -> ExternRef<MoveData> {
+        unsafe { move_library_get_move_by_hash(ptr, hash) }
+    }
+}
+
+impl Cacheable for MoveLibrary {
+    fn get_cache<'a>() -> &'a mut BTreeMap<ExternRef<Self>, Self>
+    where
+        Self: Sized,
+    {
+        unsafe { &mut CACHE }
+    }
+}
+
+static mut CACHE: BTreeMap<ExternRef<MoveLibrary>, MoveLibrary> = BTreeMap::new();
+
+extern "wasm" {
+    fn move_library_get_move(
+        ptr: ExternRef<MoveLibrary>,
+        name: ExternRef<StringKey>,
+    ) -> ExternRef<MoveData>;
+    fn move_library_get_move_by_hash(ptr: ExternRef<MoveLibrary>, hash: u32)
+        -> ExternRef<MoveData>;
+}

pkmn_lib_interface/src/app_interface/library/effect_parameter.rs

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+use crate::app_interface::StringKey;
+use crate::{ExternRef, ExternalReferenceType};
+use core::fmt::{Display, Formatter};
+
+#[repr(u8)]
+enum EffectParameterType {
+    None,
+    Bool,
+    Int,
+    Float,
+    String,
+}
+
+#[derive(Clone)]
+pub enum EffectParameter {
+    None,
+    Bool(bool),
+    Int(i64),
+    Float(f32),
+    String(StringKey),
+}
+
+impl EffectParameter {
+    pub(crate) fn create(ptr: ExternRef<Self>) -> Self {
+        unsafe {
+            match effect_parameter_get_type(ptr) {
+                EffectParameterType::None => Self::None,
+                EffectParameterType::Bool => Self::Bool(effect_parameter_as_bool(ptr)),
+                EffectParameterType::Int => Self::Int(effect_parameter_as_int(ptr)),
+                EffectParameterType::Float => Self::Float(effect_parameter_as_float(ptr)),
+                EffectParameterType::String => {
+                    Self::String(StringKey::new(effect_parameter_as_string(ptr)))
+                }
+            }
+        }
+    }
+}
+
+impl ExternalReferenceType for EffectParameter {
+    fn from_extern_value(reference: ExternRef<Self>) -> Self
+    where
+        Self: Sized,
+    {
+        EffectParameter::create(reference)
+    }
+}
+
+impl Display for EffectParameter {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            EffectParameter::None => f.write_str("EffectParameter::None"),
+            EffectParameter::Bool(b) => f.write_fmt(format_args!("EffectParameter::Bool({})", b)),
+            EffectParameter::Int(i) => f.write_fmt(format_args!("EffectParameter::Int({})", i)),
+            EffectParameter::Float(r) => f.write_fmt(format_args!("EffectParameter::Float({})", r)),
+            EffectParameter::String(s) => {
+                f.write_fmt(format_args!("EffectParameter::String(\"{}\")", s))
+            }
+        }
+    }
+}
+
+extern "wasm" {
+    fn effect_parameter_get_type(ptr: ExternRef<EffectParameter>) -> EffectParameterType;
+    fn effect_parameter_as_bool(ptr: ExternRef<EffectParameter>) -> bool;
+    fn effect_parameter_as_int(ptr: ExternRef<EffectParameter>) -> i64;
+    fn effect_parameter_as_float(ptr: ExternRef<EffectParameter>) -> f32;
+    fn effect_parameter_as_string(ptr: ExternRef<EffectParameter>) -> ExternRef<StringKey>;
+}

pkmn_lib_interface/src/app_interface/library/item.rs

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+use crate::handling::cached_value::CachedValue;
+use crate::handling::Cacheable;
+use crate::{cached_value, ExternRef, ExternalReferenceType, StringKey};
+use alloc::rc::Rc;
+
+/// An item category defines which bag slot items are stored in.
+#[repr(u8)]
+#[derive(Clone)]
+pub enum ItemCategory {
+    /// This is where most items should go.
+    MiscItem,
+    /// Pokeballs are used for capturing Pokemons.
+    Pokeball,
+    /// Medicine is used for healing HP, PP, and status effects
+    Medicine,
+    /// Berry is used for all berries.
+    Berry,
+    /// TMHM is used for Technical and Hidden Machines.
+    TMHM,
+    /// Form Changer is used for items that change forms, such as mega stones.
+    FormChanger,
+    /// Key Items are single stored items, generally used for story progression.
+    KeyItem,
+    /// Mail is used for mail items.
+    Mail,
+}
+
+/// A battle item category defines how the item is categorized when in battle.
+#[repr(u8)]
+#[derive(Clone)]
+pub enum BattleItemCategory {
+    /// This item can't be used in battle.
+    None,
+    /// This item is used for healing Pokemon.
+    Healing,
+    /// This item is used for healing Pokemon from a status.
+    StatusHealing,
+    /// This item is used for capturing Pokemon.
+    Pokeball,
+    /// This item does not belong in above categories, but is still a battle item.
+    MiscBattleItem,
+}
+
+struct ItemInner {
+    ptr: ExternRef<Item>,
+    name: CachedValue<StringKey>,
+    category: CachedValue<ItemCategory>,
+    battle_category: CachedValue<BattleItemCategory>,
+    price: CachedValue<i32>,
+}
+
+/// An item is an object which the player can pick up, keep in their Bag, and use in some manner
+#[derive(Clone)]
+pub struct Item {
+    inner: Rc<ItemInner>,
+}
+
+impl Item {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+        Self::from_ref(ptr, &|ptr| Self {
+            inner: Rc::new(ItemInner {
+                ptr,
+                name: cached_value!({ StringKey::new(item_get_name(ptr)) }),
+                category: cached_value!({ item_get_category(ptr) }),
+                battle_category: cached_value!({ item_get_battle_category(ptr) }),
+                price: cached_value!({ item_get_price(ptr) }),
+            }),
+        })
+    }
+
+    pub(crate) fn ptr(&self) -> ExternRef<Self> {
+        self.inner.ptr
+    }
+
+    /// The name of the item.
+    pub fn name(&self) -> StringKey {
+        self.inner.name.value()
+    }
+    /// Which bag slot items are stored in.
+    pub fn category(&self) -> ItemCategory {
+        self.inner.category.value()
+    }
+    /// How the item is categorized when in battle.
+    pub fn battle_category(&self) -> BattleItemCategory {
+        self.inner.battle_category.value()
+    }
+    /// The buying value of the item.
+    pub fn price(&self) -> i32 {
+        self.inner.price.value()
+    }
+    pub fn has_flag(&self, flag: &StringKey) -> bool {
+        unsafe { item_has_flag(self.ptr(), flag.ptr()) }
+    }
+}
+
+crate::handling::cacheable::cacheable!(Item);
+
+impl ExternalReferenceType for Item {
+    fn from_extern_value(reference: ExternRef<Self>) -> Self {
+        Item::new(reference)
+    }
+}
+
+extern "wasm" {
+    fn item_get_name(ptr: ExternRef<Item>) -> ExternRef<StringKey>;
+    fn item_get_category(ptr: ExternRef<Item>) -> ItemCategory;
+    fn item_get_battle_category(ptr: ExternRef<Item>) -> BattleItemCategory;
+    fn item_get_price(ptr: ExternRef<Item>) -> i32;
+    fn item_has_flag(ptr: ExternRef<Item>, flag: ExternRef<StringKey>) -> bool;
+}

pkmn_lib_interface/src/app_interface/library/mod.rs

@@ -0,0 +1,11 @@
+pub mod data_libraries;
+pub mod effect_parameter;
+pub mod item;
+pub mod move_data;
+pub mod species;
+
+pub use data_libraries::*;
+pub use effect_parameter::EffectParameter;
+pub use item::*;
+pub use move_data::*;
+pub use species::*;

pkmn_lib_interface/src/app_interface/library/move_data.rs

@@ -0,0 +1,120 @@
+use crate::app_interface::StringKey;
+use crate::handling::cached_value::CachedValue;
+use crate::handling::Cacheable;
+use crate::{cached_value, ExternRef, ExternalReferenceType};
+use alloc::collections::BTreeMap;
+use alloc::rc::Rc;
+
+#[repr(u8)]
+#[derive(Clone)]
+pub enum MoveCategory {
+    Physical = 0,
+    Special = 1,
+    Status = 2,
+}
+
+#[repr(u8)]
+#[derive(Clone)]
+pub enum MoveTarget {
+    Adjacent,
+    AdjacentAlly,
+    AdjacentAllySelf,
+    AdjacentOpponent,
+
+    All,
+    AllAdjacent,
+    AllAdjacentOpponent,
+    AllAlly,
+    AllOpponent,
+
+    Any,
+
+    RandomOpponent,
+    OnSelf,
+}
+
+struct MoveDataInner {
+    ptr: ExternRef<MoveData>,
+    name: CachedValue<StringKey>,
+    move_type: CachedValue<u8>,
+    category: CachedValue<MoveCategory>,
+    base_power: CachedValue<u8>,
+    accuracy: CachedValue<u8>,
+    base_usages: CachedValue<u8>,
+    target: CachedValue<MoveTarget>,
+    priority: CachedValue<i8>,
+}
+
+#[derive(Clone)]
+pub struct MoveData {
+    inner: Rc<MoveDataInner>,
+}
+
+impl MoveData {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+        MoveData::from_ref(ptr, &|ptr| Self {
+            inner: Rc::new(MoveDataInner {
+                ptr,
+                name: cached_value!({ StringKey::new(move_data_get_name(ptr)) }),
+                move_type: cached_value!({ move_data_get_type(ptr) }),
+                category: cached_value!({ move_data_get_category(ptr) }),
+                base_power: cached_value!({ move_data_get_base_power(ptr) }),
+                accuracy: cached_value!({ move_data_get_accuracy(ptr) }),
+                base_usages: cached_value!({ move_data_get_base_power(ptr) }),
+                target: cached_value!({ move_data_get_target(ptr) }),
+                priority: cached_value!({ move_data_get_priority(ptr) }),
+            }),
+        })
+    }
+    pub(crate) fn ptr(&self) -> ExternRef<Self> {
+        self.inner.ptr
+    }
+
+    pub fn name(&self) -> StringKey {
+        self.inner.name.value()
+    }
+    pub fn move_type(&self) -> u8 {
+        self.inner.move_type.value()
+    }
+    pub fn category(&self) -> MoveCategory {
+        self.inner.category.value()
+    }
+    pub fn base_power(&self) -> u8 {
+        self.inner.base_power.value()
+    }
+    pub fn accuracy(&self) -> u8 {
+        self.inner.accuracy.value()
+    }
+    pub fn base_usages(&self) -> u8 {
+        self.inner.base_usages.value()
+    }
+    pub fn target(&self) -> MoveTarget {
+        self.inner.target.value()
+    }
+    pub fn priority(&self) -> i8 {
+        self.inner.priority.value()
+    }
+    pub fn has_flag(&self, flag: &StringKey) -> bool {
+        unsafe { move_data_has_flag(self.ptr(), flag.ptr()) }
+    }
+}
+
+impl ExternalReferenceType for MoveData {
+    fn from_extern_value(reference: ExternRef<Self>) -> Self {
+        MoveData::new(reference)
+    }
+}
+
+crate::handling::cacheable::cacheable!(MoveData);
+
+extern "wasm" {
+    fn move_data_get_name(ptr: ExternRef<MoveData>) -> ExternRef<StringKey>;
+    fn move_data_get_type(ptr: ExternRef<MoveData>) -> u8;
+    fn move_data_get_category(ptr: ExternRef<MoveData>) -> MoveCategory;
+    fn move_data_get_base_power(ptr: ExternRef<MoveData>) -> u8;
+    fn move_data_get_accuracy(ptr: ExternRef<MoveData>) -> u8;
+    fn move_data_get_base_usages(ptr: ExternRef<MoveData>) -> u8;
+    fn move_data_get_target(ptr: ExternRef<MoveData>) -> MoveTarget;
+    fn move_data_get_priority(ptr: ExternRef<MoveData>) -> i8;
+    fn move_data_has_flag(ptr: ExternRef<MoveData>, flag: ExternRef<StringKey>) -> bool;
+}

pkmn_lib_interface/src/app_interface/library/species.rs

@@ -0,0 +1,149 @@
+use crate::handling::cached_value::CachedValue;
+use crate::handling::Cacheable;
+use crate::{
+    cached_value, ExternRef, ExternalReferenceType, FFIArray, ImmutableList, StringKey,
+    VecExternRef,
+};
+use alloc::rc::Rc;
+use alloc::vec::Vec;
+
+#[repr(u8)]
+pub enum Gender {
+    Male = 0,
+    Female = 1,
+    Genderless = 2,
+}
+
+#[repr(u8)]
+pub enum Statistic {
+    HP = 0,
+    Attack = 1,
+    Defense = 2,
+    SpecialAttack = 3,
+    SpecialDefense = 4,
+    Speed = 5,
+}
+
+pub struct ImmutableStatisticSetInner {
+    ptr: ExternRef<ImmutableStatisticSet>,
+    /// The health point stat value.
+    hp: CachedValue<u16>,
+    /// The physical attack stat value.
+    attack: CachedValue<u16>,
+    /// The physical defense stat value.
+    defense: CachedValue<u16>,
+    /// The special attack stat value.
+    special_attack: CachedValue<u16>,
+    /// The special defense stat value.
+    special_defense: CachedValue<u16>,
+    /// The speed stat value.
+    speed: CachedValue<u16>,
+}
+
+#[derive(Clone)]
+pub struct ImmutableStatisticSet {
+    inner: Rc<ImmutableStatisticSetInner>,
+}
+
+impl ImmutableStatisticSet {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+        Self::from_ref(ptr, &|ptr| Self {
+            inner: Rc::new(ImmutableStatisticSetInner {
+                ptr,
+                hp: cached_value!({ static_statistics_set_get_hp(ptr) }),
+                attack: cached_value!({ static_statistics_set_get_attack(ptr) }),
+                defense: cached_value!({ static_statistics_set_get_defense(ptr) }),
+                special_attack: cached_value!({ static_statistics_set_get_special_attack(ptr) }),
+                special_defense: cached_value!({ static_statistics_set_get_special_defense(ptr) }),
+                speed: cached_value!({ static_statistics_set_get_speed(ptr) }),
+            }),
+        })
+    }
+
+    pub fn hp(&self) -> u16 {
+        self.inner.hp.value()
+    }
+    pub fn attack(&self) -> u16 {
+        self.inner.attack.value()
+    }
+    pub fn defense(&self) -> u16 {
+        self.inner.defense.value()
+    }
+    pub fn special_attack(&self) -> u16 {
+        self.inner.special_attack.value()
+    }
+    pub fn special_defense(&self) -> u16 {
+        self.inner.special_defense.value()
+    }
+    pub fn speed(&self) -> u16 {
+        self.inner.speed.value()
+    }
+}
+
+struct FormInner {
+    ptr: ExternRef<Form>,
+    name: CachedValue<StringKey>,
+    height: CachedValue<f32>,
+    weight: CachedValue<f32>,
+    types: CachedValue<Vec<u8>>,
+    base_experience: CachedValue<u32>,
+    base_stats: CachedValue<ImmutableStatisticSet>,
+    abilities: CachedValue<ImmutableList<StringKey>>,
+    hidden_abilities: CachedValue<ImmutableList<StringKey>>,
+    // moves: CachedValue<LearnableMoves>,
+}
+
+#[derive(Clone)]
+pub struct Form {
+    inner: Rc<FormInner>,
+}
+
+impl Form {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+        Self::from_ref(ptr, &|ptr| Self {
+            inner: Rc::new(FormInner {
+                ptr,
+                name: cached_value!({ form_get_name(ptr).get_value().unwrap() }),
+                height: cached_value!({ form_get_height(ptr) }),
+                weight: cached_value!({ form_get_weight(ptr) }),
+                types: cached_value!({
+                    let raw = form_get_types(ptr);
+                    Vec::from_raw_parts(raw.ptr(), raw.len(), raw.len())
+                }),
+                base_experience: cached_value!({ form_get_base_experience(ptr) }),
+                base_stats: cached_value!({ form_get_base_stats(ptr).get_value().unwrap() }),
+                abilities: cached_value!({ form_get_abilities(ptr).get_immutable_list() }),
+                hidden_abilities: cached_value!({
+                    form_get_hidden_abilities(ptr).get_immutable_list()
+                }),
+            }),
+        })
+    }
+}
+
+impl ExternalReferenceType for ImmutableStatisticSet {
+    fn from_extern_value(reference: ExternRef<Self>) -> Self {
+        ImmutableStatisticSet::new(reference)
+    }
+}
+
+crate::handling::cacheable::cacheable!(ImmutableStatisticSet);
+crate::handling::cacheable::cacheable!(Form);
+
+extern "wasm" {
+    fn static_statistics_set_get_hp(r: ExternRef<ImmutableStatisticSet>) -> u16;
+    fn static_statistics_set_get_attack(r: ExternRef<ImmutableStatisticSet>) -> u16;
+    fn static_statistics_set_get_defense(r: ExternRef<ImmutableStatisticSet>) -> u16;
+    fn static_statistics_set_get_special_attack(r: ExternRef<ImmutableStatisticSet>) -> u16;
+    fn static_statistics_set_get_special_defense(r: ExternRef<ImmutableStatisticSet>) -> u16;
+    fn static_statistics_set_get_speed(r: ExternRef<ImmutableStatisticSet>) -> u16;
+
+    fn form_get_name(r: ExternRef<Form>) -> ExternRef<StringKey>;
+    fn form_get_height(r: ExternRef<Form>) -> f32;
+    fn form_get_weight(r: ExternRef<Form>) -> f32;
+    fn form_get_types(r: ExternRef<Form>) -> FFIArray<u8>;
+    fn form_get_base_experience(r: ExternRef<Form>) -> u32;
+    fn form_get_base_stats(r: ExternRef<Form>) -> ExternRef<ImmutableStatisticSet>;
+    fn form_get_abilities(r: ExternRef<Form>) -> VecExternRef<StringKey>;
+    fn form_get_hidden_abilities(r: ExternRef<Form>) -> VecExternRef<StringKey>;
+}

pkmn_lib_interface/src/app_interface/list.rs

@@ -0,0 +1,74 @@
+use crate::{ExternalReferenceType, VecExternRef};
+use alloc::boxed::Box;
+use alloc::collections::BTreeMap;
+use alloc::vec::Vec;
+use core::marker::PhantomData;
+
+struct ImmutableListInner<T: Clone> {
+    extern_ref: VecExternRef<T>,
+    resource_type: PhantomData<T>,
+    values: spin::RwLock<Vec<Option<Option<T>>>>,
+}
+
+#[derive(Clone)]
+pub struct ImmutableList<T>
+where
+    T: Clone,
+    T: ExternalReferenceType,
+{
+    inner: *const ImmutableListInner<T>,
+}
+
+impl<T> ImmutableList<T>
+where
+    T: Clone,
+    T: ExternalReferenceType,
+{
+    fn new(extern_ref: VecExternRef<T>) -> Self {
+        let mut values = Vec::new();
+        values.resize(extern_ref.len() as usize, None);
+        let inner = Box::new(ImmutableListInner {
+            extern_ref,
+            resource_type: Default::default(),
+            values: spin::RwLock::new(values),
+        });
+        let inner_ptr = Box::into_raw(inner);
+        ImmutableList {
+            inner: inner_ptr as *const ImmutableListInner<T>,
+        }
+    }
+
+    pub(crate) fn from_ref(extern_ref: VecExternRef<T>) -> Self {
+        unsafe {
+            let existing = CACHE.get(&extern_ref.get_internal_index());
+            if let Some(v) = existing {
+                let inner = *v as *const ImmutableListInner<T>;
+                ImmutableList { inner }
+            } else {
+                let v = Self::new(extern_ref);
+                CACHE.insert(extern_ref.get_internal_index(), v.inner as *const u8);
+                v
+            }
+        }
+    }
+
+    pub fn get(&self, index: u32) -> Option<T> {
+        unsafe {
+            let inner = self.inner.as_ref().unwrap();
+            {
+                let rg = inner.values.read();
+                let v = rg.get(index as usize).unwrap();
+                if let Some(v) = v {
+                    return v.clone();
+                }
+            }
+            let r = inner.extern_ref.at(index);
+            let value = r.get_value();
+            let mut wg = inner.values.write();
+            wg[index as usize] = Some(value);
+            wg[index as usize].as_ref().unwrap().clone()
+        }
+    }
+}
+
+static mut CACHE: BTreeMap<u32, *const u8> = BTreeMap::new();

pkmn_lib_interface/src/app_interface/mod.rs

@@ -0,0 +1,9 @@
+pub mod battling;
+pub mod library;
+pub mod list;
+pub mod string_key;
+
+pub use battling::*;
+pub use library::*;
+pub use string_key::get_hash;
+pub use string_key::StringKey;

pkmn_lib_interface/src/app_interface/string_key.rs

@@ -0,0 +1,129 @@
+use crate::handling::Cacheable;
+use crate::{ExternRef, ExternalReferenceType};
+use alloc::rc::Rc;
+use core::cell::RefCell;
+use core::fmt::{Display, Formatter};
+use cstr_core::{c_char, CString};
+
+struct StringKeyInner {
+    ptr: ExternRef<StringKey>,
+    str: RefCell<Option<CString>>,
+    hash: RefCell<Option<u32>>,
+}
+
+#[derive(Clone)]
+pub struct StringKey {
+    data: Rc<StringKeyInner>,
+}
+
+impl StringKey {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+        StringKey::from_ref(ptr, &|ptr| -> StringKey {
+            StringKey {
+                data: Rc::new(StringKeyInner {
+                    ptr,
+                    str: RefCell::new(None),
+                    hash: RefCell::new(None),
+                }),
+            }
+        })
+    }
+
+    pub(super) fn ptr(&self) -> ExternRef<Self> {
+        self.data.ptr
+    }
+
+    pub fn str(&self) -> &CString {
+        if self.data.str.borrow().is_none() {
+            unsafe {
+                self.data
+                    .str
+                    .replace(Some(CString::from_raw(string_key_get_str(self.ptr()))));
+            }
+        }
+        unsafe { (*self.data.str.as_ptr()).as_ref().unwrap() }
+    }
+    pub fn hash(&self) -> u32 {
+        if self.data.hash.borrow().is_none() {
+            unsafe {
+                self.data
+                    .hash
+                    .replace(Some(string_key_get_hash(self.ptr())));
+            }
+        }
+        self.data.hash.borrow().unwrap()
+    }
+}
+
+crate::handling::cacheable::cacheable!(StringKey);
+
+impl ExternalReferenceType for StringKey {
+    fn from_extern_value(reference: ExternRef<Self>) -> Self {
+        StringKey::new(reference)
+    }
+}
+
+impl Display for StringKey {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        let s = self.str();
+        f.write_str(s.to_str().as_ref().unwrap())
+    }
+}
+
+extern "wasm" {
+    fn string_key_get_str(ptr: ExternRef<StringKey>) -> *mut c_char;
+    fn string_key_get_hash(ptr: ExternRef<StringKey>) -> u32;
+}
+
+const CRC_TABLE: &[u32] = &[
+    0, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+    0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+    0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+    0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+    0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+    0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+    0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+    0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+    0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+    0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+    0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+    0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+    0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+    0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+    0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+    0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+    0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+    0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+    0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+    0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+    0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+    0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+    0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+    0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
+    0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
+    0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+    0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+    0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+    0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+    0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+    0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
+];
+
+const fn to_lower(c: u8) -> u8 {
+    if c >= b'A' && c <= b'Z' {
+        return c + (b'a' - b'A');
+    }
+    c
+}
+
+pub const fn get_hash<const N: usize>(s: &[u8; N]) -> u32 {
+    let mut crc: u32 = 0xffffffff;
+
+    let mut i: usize = 0;
+    while i < N {
+        crc = (crc >> 8) ^ CRC_TABLE[((crc ^ (to_lower(s[i]) as u32)) & 0xff) as usize];
+        i += 1;
+    }
+    crc ^ 0xffffffff
+}

pkmn_lib_interface/src/handling/cacheable.rs

@@ -0,0 +1,37 @@
+use crate::ExternRef;
+use alloc::collections::BTreeMap;
+
+pub trait Cacheable {
+    fn get_cache<'a>() -> &'a mut BTreeMap<ExternRef<Self>, Self>
+    where
+        Self: Sized;
+
+    fn from_ref(ptr: ExternRef<Self>, ctor: &dyn Fn(ExternRef<Self>) -> Self) -> Self
+    where
+        Self: Sized,
+        Self: Clone,
+    {
+        let opt = Self::get_cache().get(&ptr);
+        if let Some(v) = opt {
+            return v.clone();
+        }
+        Self::get_cache().insert(ptr, ctor(ptr));
+        return Self::get_cache().get(&ptr).unwrap().clone();
+    }
+}
+
+macro_rules! cacheable {
+    ($type: ident) => {
+        paste::paste!{
+            static mut [<$type:upper _CACHE>]: alloc::collections::BTreeMap<ExternRef<$type>, $type> =
+                alloc::collections::BTreeMap::new();
+            impl crate::handling::Cacheable for $type {
+                fn get_cache<'a>() -> &'a mut alloc::collections::BTreeMap<ExternRef<$type>, $type> {
+                    unsafe { &mut [<$type:upper _CACHE>] }
+                }
+            }
+        }
+    };
+}
+
+pub(crate) use cacheable;

pkmn_lib_interface/src/handling/cached_value.rs

@@ -0,0 +1,36 @@
+use alloc::boxed::Box;
+
+pub struct CachedValue<T> {
+    init_fn: Box<dyn Fn() -> T>,
+    value: Option<T>,
+}
+
+impl<T> CachedValue<T>
+where
+    T: Clone,
+{
+    pub fn new(init_fn: Box<dyn Fn() -> T>) -> Self {
+        Self {
+            init_fn,
+            value: None,
+        }
+    }
+
+    #[inline]
+    pub fn value(&self) -> T {
+        if self.value.is_none() {
+            unsafe {
+                let s = self as *const Self as *mut Self;
+                s.as_mut().unwrap().value.replace((self.init_fn)());
+            }
+        }
+        self.value.as_ref().unwrap().clone()
+    }
+}
+
+#[macro_export]
+macro_rules! cached_value {
+    ($init: block) => {
+        CachedValue::new(alloc::boxed::Box::new(move || unsafe { $init }))
+    };
+}

pkmn_lib_interface/src/handling/capabilities.rs

@@ -0,0 +1,59 @@
+#[repr(u8)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum ScriptCapabilities {
+    Initialize = 1,
+    OnStack,
+    OnRemove,
+    OnBeforeTurn,
+    ChangeAttack,
+    ModifyNumberOfHits,
+    PreventAttack,
+    FailAttack,
+    StopBeforeAttack,
+    OnBeforeAttack,
+    FailIncomingAttack,
+    IsInvulnerable,
+    OnAttackMiss,
+    ChangeAttackType,
+    ChangeEffectiveness,
+    BlockCritical,
+    OnIncomingHit,
+    OnFaintingOpponent,
+    PreventStatBoostChange,
+    ModifyStatBoostChange,
+    PreventSecondaryEffects,
+    OnSecondaryEffect,
+    OnAfterHits,
+    PreventSelfSwitch,
+    ModifyEffectChance,
+    ModifyIncomingEffectChance,
+    OverrideBasePower,
+    ChangeDamageStatsUser,
+    BypassDefensiveStat,
+    BypassOffensiveStat,
+    ModifyStatModifier,
+    ModifyDamageModifier,
+    OverrideDamage,
+    OverrideIncomingDamage,
+    ChangeSpeed,
+    ChangePriority,
+    OnFail,
+    OnOpponentFail,
+    PreventRunAway,
+    PreventOpponentRunAway,
+    PreventOpponentSwitch,
+    OnEndTurn,
+    OnDamage,
+    OnFaint,
+    OnAfterHeldItemConsume,
+    PreventIncomingCritical,
+    ModifyCriticalStage,
+    OverrideCriticalModifier,
+    OverrideSTABModifier,
+    ModifyExperienceGain,
+    DoesShareExperience,
+    BlockWeather,
+    OnSwitchIn,
+    ModifyOffensiveStatValue,
+    ModifyDefensiveStatValue,
+}

pkmn_lib_interface/src/handling/extern_ref.rs

@@ -0,0 +1,160 @@
+use crate::ImmutableList;
+use core::cmp::Ordering;
+use core::intrinsics::transmute;
+use core::marker::PhantomData;
+
+#[repr(C)]
+pub struct ExternRef<T> {
+    p: u32,
+    resource_type: PhantomData<T>,
+}
+
+impl<T> ExternRef<T> {
+    pub fn is_null(&self) -> bool {
+        self.p == 0
+    }
+
+    pub fn get_value(&self) -> Option<T>
+    where
+        T: ExternalReferenceType,
+        T: Sized,
+        T:,
+    {
+        T::instantiate_from_extern_value(*self)
+    }
+}
+
+impl<T> Clone for ExternRef<T> {
+    fn clone(&self) -> Self {
+        Self {
+            p: self.p,
+            resource_type: Default::default(),
+        }
+    }
+}
+
+impl<T> Copy for ExternRef<T> {}
+
+impl<T> Eq for ExternRef<T> {}
+
+impl<T> PartialEq<Self> for ExternRef<T> {
+    fn eq(&self, other: &Self) -> bool {
+        u32::eq(&self.p, &other.p)
+    }
+}
+
+impl<T> PartialOrd<Self> for ExternRef<T> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        u32::partial_cmp(&self.p, &other.p)
+    }
+}
+
+impl<T> Ord for ExternRef<T> {
+    fn cmp(&self, other: &Self) -> Ordering {
+        u32::cmp(&self.p, &other.p)
+    }
+}
+
+#[repr(C)]
+pub struct VecExternRef<T> {
+    v: u64,
+    resource_type: PhantomData<T>,
+}
+
+impl<T> VecExternRef<T> {
+    pub fn is_null(&self) -> bool {
+        self.v == 0
+    }
+
+    pub(crate) fn get_internal_index(&self) -> u32 {
+        let v: (u32, u32) = unsafe { transmute(self.v) };
+        v.0
+    }
+
+    pub fn len(&self) -> u32 {
+        let v: (u32, u32) = unsafe { transmute(self.v) };
+        v.1
+    }
+
+    pub fn at(&self, index: u32) -> ExternRef<T> {
+        let p = unsafe { _vec_extern_ref_get_value(self.get_internal_index(), index) };
+        ExternRef {
+            p,
+            resource_type: Default::default(),
+        }
+    }
+
+    pub fn get_immutable_list(&self) -> ImmutableList<T>
+    where
+        T: Clone,
+        T: ExternalReferenceType,
+    {
+        ImmutableList::from_ref(self.clone())
+    }
+}
+
+impl<T> Clone for VecExternRef<T> {
+    fn clone(&self) -> Self {
+        Self {
+            v: self.v,
+            resource_type: Default::default(),
+        }
+    }
+}
+
+impl<T> Copy for VecExternRef<T> {}
+
+impl<T> Eq for VecExternRef<T> {}
+
+impl<T> PartialEq<Self> for VecExternRef<T> {
+    fn eq(&self, other: &Self) -> bool {
+        u64::eq(&self.v, &other.v)
+    }
+}
+
+impl<T> PartialOrd<Self> for VecExternRef<T> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        u64::partial_cmp(&self.v, &other.v)
+    }
+}
+
+impl<T> Ord for VecExternRef<T> {
+    fn cmp(&self, other: &Self) -> Ordering {
+        u64::cmp(&self.v, &other.v)
+    }
+}
+
+pub trait ExternalReferenceType {
+    fn from_extern_value(reference: ExternRef<Self>) -> Self
+    where
+        Self: Sized;
+
+    fn instantiate_from_extern_value(reference: ExternRef<Self>) -> Option<Self>
+    where
+        Self: Sized,
+    {
+        if reference.is_null() {
+            None
+        } else {
+            Some(Self::from_extern_value(reference))
+        }
+    }
+}
+
+#[macro_export]
+macro_rules! impl_extern_ctor {
+    ($name:ty) => {
+        impl $name {
+            pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+                Self { ptr }
+            }
+            pub(crate) fn ptr(&self) -> &ExternRef<Self> {
+                &self.ptr
+            }
+        }
+    };
+}
+
+extern "wasm" {
+    fn _vec_extern_ref_get_value(extern_ref: u32, index: u32) -> u32;
+}

pkmn_lib_interface/src/handling/ffi_array.rs

@@ -0,0 +1,39 @@
+use alloc::boxed::Box;
+use alloc::vec::Vec;
+use core::mem;
+
+#[repr(C)]
+pub struct FFIArray<T> {
+    ptr: *mut T,
+    len: usize,
+}
+
+impl<T> FFIArray<T> {
+    pub fn new(v: &[T]) -> Self {
+        let boxed_slice: Box<&[T]> = Box::new(v);
+        let r = Self {
+            ptr: boxed_slice.as_ptr() as *mut T,
+            len: boxed_slice.len(),
+        };
+        mem::forget(boxed_slice);
+        r
+    }
+
+    fn delete(&self) {
+        unsafe {
+            drop(Vec::from_raw_parts(self.ptr, self.len, self.len));
+        }
+    }
+
+    pub(crate) fn ptr(&self) -> *mut T {
+        self.ptr
+    }
+    pub(crate) fn len(&self) -> usize {
+        self.len
+    }
+}
+
+#[no_mangle]
+extern "wasm" fn delete_ffi_array(a: FFIArray<u8>) {
+    a.delete()
+}

pkmn_lib_interface/src/handling/mod.rs

@@ -0,0 +1,22 @@
+pub(crate) mod cacheable;
+pub(crate) mod cached_value;
+pub mod capabilities;
+pub mod extern_ref;
+pub mod ffi_array;
+pub mod script;
+
+pub use capabilities::*;
+
+pub(crate) use cacheable::Cacheable;
+pub use script::Script;
+
+#[repr(u8)]
+pub enum ScriptCategory {
+    Move,
+    Ability,
+    Status,
+    Pokemon,
+    Battle,
+    Side,
+    ItemBattleTrigger,
+}

pkmn_lib_interface/src/handling/script.rs

@@ -0,0 +1,39 @@
+use crate::app_interface::list::ImmutableList;
+use crate::app_interface::{BaseTurnChoice, BattleLibrary, EffectParameter};
+use crate::handling::ScriptCapabilities;
+use crate::ExternRef;
+use core::ffi::c_void;
+use core::fmt::Debug;
+
+pub trait Script {
+    fn new() -> Self
+    where
+        Self: Sized;
+    fn destroy(&self);
+    fn get_name(&self) -> &str;
+    fn get_capabilities(&self) -> &[ScriptCapabilities];
+
+    fn on_initialize(
+        &self,
+        _library: &BattleLibrary,
+        _parameters: Option<ImmutableList<EffectParameter>>,
+    ) {
+    }
+    fn on_before_turn(&self, _choice: ExternRef<BaseTurnChoice>) {}
+}
+
+impl Debug for dyn Script {
+    fn fmt(&self, _f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        core::fmt::Result::Ok(())
+    }
+}
+
+pub trait OwnerGetter {
+    fn get_owner<T>(&self) -> Option<ExternRef<T>> {
+        unimplemented!()
+    }
+}
+
+extern "wasm" {
+    pub fn get_script_owner(pointer: *const c_void) -> ExternRef<u8>;
+}

pkmn_lib_interface/src/lib.rs

@@ -0,0 +1,96 @@
+#![feature(core_panic)]
+#![feature(alloc_error_handler)]
+#![feature(fn_traits)]
+#![feature(const_for)]
+#![feature(const_mut_refs)]
+#![feature(inline_const)]
+#![feature(inline_const_pat)]
+#![feature(repr128)]
+#![feature(downcast_unchecked)]
+#![feature(panic_info_message)]
+#![feature(const_btree_new)]
+#![feature(wasm_abi)]
+#![feature(thread_local)]
+#![feature(build_hasher_simple_hash_one)]
+#![no_std]
+#![allow(incomplete_features)]
+
+extern crate alloc;
+extern crate core;
+extern crate wee_alloc;
+
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
+use crate::app_interface::list::ImmutableList;
+use crate::app_interface::{BaseTurnChoice, BattleLibrary, EffectParameter, StringKey};
+pub(crate) use crate::handling::extern_ref::*;
+use crate::handling::ffi_array::FFIArray;
+use crate::handling::{Script, ScriptCapabilities, ScriptCategory};
+use alloc::boxed::Box;
+
+#[macro_use]
+#[allow(dead_code)]
+pub mod app_interface;
+pub mod handling;
+pub mod utils;
+
+pub type LoadScriptFnType = Box<dyn Fn(ScriptCategory, &StringKey) -> Option<Box<dyn Script>>>;
+
+static mut LOAD_SCRIPT_FN: Option<LoadScriptFnType> = None;
+
+pub fn set_load_script_fn(f: LoadScriptFnType) {
+    unsafe {
+        LOAD_SCRIPT_FN = Some(f);
+    }
+}
+
+#[no_mangle]
+extern "wasm" fn load_script(category: ScriptCategory, name: ExternRef<StringKey>) -> u32 {
+    let name_c = StringKey::new(name);
+    let boxed_script = unsafe { &LOAD_SCRIPT_FN }.as_ref().unwrap()(category, &name_c);
+    if boxed_script.is_none() {
+        return 0;
+    }
+    let b = Box::new(boxed_script.unwrap());
+    Box::into_raw(b) as u32
+}
+
+#[no_mangle]
+unsafe extern "wasm" fn destroy_script(script: *mut u8) {
+    // By turning it from a raw pointer back into a Box with from_raw, we give ownership back to rust.
+    // This lets Rust do the cleanup.
+    let boxed_script = Box::from_raw(script as *mut Box<dyn Script>);
+    boxed_script.destroy();
+}
+
+#[no_mangle]
+unsafe extern "wasm" fn get_script_capabilities(
+    script: *const Box<dyn Script>,
+) -> FFIArray<ScriptCapabilities> {
+    let c = script.as_ref().unwrap().get_capabilities();
+    FFIArray::new(c)
+}
+
+#[no_mangle]
+unsafe extern "wasm" fn script_on_initialize(
+    script: *const Box<dyn Script>,
+    library: ExternRef<BattleLibrary>,
+    parameters: VecExternRef<EffectParameter>,
+) {
+    let lib = BattleLibrary::new(library);
+    let parameters = ImmutableList::from_ref(parameters);
+    script
+        .as_ref()
+        .unwrap()
+        .as_ref()
+        .on_initialize(&lib, Some(parameters));
+}
+
+#[no_mangle]
+unsafe extern "wasm" fn script_on_before_turn(
+    script: *const Box<dyn Script>,
+    choice: ExternRef<BaseTurnChoice>,
+) {
+    script.as_ref().unwrap().as_ref().on_before_turn(choice)
+}

pkmn_lib_interface/src/utils.rs

@@ -0,0 +1,75 @@
+use alloc::alloc::alloc;
+use core::alloc::Layout;
+#[cfg(not(test))]
+use core::panic::PanicInfo;
+use cstr_core::c_char;
+
+extern "wasm" {
+    fn _print(s: *const u8, len: usize);
+    fn _error(
+        message: *const u8,
+        message_len: usize,
+        file: *const u8,
+        file_len: usize,
+        line: u32,
+        position: u32,
+    );
+}
+
+pub fn print_raw(s: &[c_char]) {
+    unsafe {
+        _print(s.as_ptr(), s.len());
+    }
+}
+
+#[macro_export]
+macro_rules! println { ($($args:tt)*) => { pkmn_lib_interface::utils::print_raw(alloc::format!($($args)*).as_bytes()); } }
+
+#[macro_export]
+#[cfg(debug_assertions)]
+macro_rules! dbg { ($($args:tt)*) => { pkmn_lib_interface::utils::print_raw(alloc::format!($($args)*).as_bytes()); } }
+
+#[macro_export]
+#[cfg(not(debug_assertions))]
+macro_rules! dbg {
+    ($($args:tt)*) => {{}};
+}
+
+#[panic_handler]
+#[no_mangle]
+#[cfg(not(test))]
+pub fn begin_panic_handler(panic_info: &PanicInfo<'_>) -> ! {
+    let msg = panic_info.message().unwrap().as_str().unwrap();
+    let mut line = 0;
+    let mut position = 0;
+    let mut file = "";
+    if let Some(s) = panic_info.location() {
+        line = s.line();
+        position = s.column();
+        file = s.file();
+    }
+
+    unsafe {
+        _error(
+            msg.as_ptr(),
+            msg.len(),
+            file.as_ptr(),
+            file.len(),
+            line,
+            position,
+        );
+    }
+    loop {}
+}
+
+#[alloc_error_handler]
+#[no_mangle]
+#[cfg(not(test))]
+fn allocation_error_handler(layout: core::alloc::Layout) -> ! {
+    panic!("memory allocation of {} bytes failed", layout.size())
+}
+
+#[no_mangle]
+unsafe extern "wasm" fn allocate_mem(len: u32, align: u32) -> *mut u8 {
+    alloc(Layout::from_size_align(len as usize, align as usize).unwrap())
+}