Initial work on FFI

Cargo.toml

@@ -8,21 +8,21 @@ edition = "2018"
 
 [lib]
 name = "pkmn_lib"
-crate_type = ["rlib"]
+crate_type = ["cdylib", "rlib"]
 path = "src/lib.rs"
 
 [features]
 ffi = []
 serde = ["dep:serde"]
 wasm = ["dep:wasmer", "dep:unique-type-id", "dep:unique-type-id-derive"]
-default = ["serde", "wasm"]
+default = ["serde", "wasm", "ffi"]
 
 [profile.dev]
 opt-level = 0
 debug = true
 debug-assertions = true
 overflow-checks = true
-lto = "thin"
+lto = false
 panic = 'unwind'
 incremental = true
 codegen-units = 256
@@ -33,7 +33,7 @@ opt-level = 3
 debug = 1
 debug-assertions = false
 overflow-checks = true
-lto = "fat"
+lto = false
 panic = 'unwind'
 incremental = false
 codegen-units = 16
@@ -56,7 +56,7 @@ wasmer = { version = "3.0.0-beta", optional = true, default-features = true }
 unique-type-id = { version = "1.0.0", optional = true }
 unique-type-id-derive = { version = "1.0.0", optional = true }
 paste = { version = "1.0.8" }
-arcstr = "1.1.4"
+arcstr = { version = "1.1.4", features = ["std"] }
 
 [dev-dependencies]
 csv = "1.1.6"

src/ffi/mod.rs

@@ -0,0 +1,100 @@
+mod static_data;
+
+type OwnedPtr<T> = *mut T;
+type BorrowedPtr<T> = *const T;
+
+macro_rules! ffi_getter {
+    (
+        $type:ty, $func:ident, $returns: ty
+    ) => {
+        paste::paste! {
+            #[no_mangle]
+            extern "C" fn [< $type:snake _ $func >](ptr: ExternPointer<$type>) -> $returns {
+                ptr.as_ref().$func()
+            }
+        }
+    };
+}
+
+macro_rules! ffi_stringkey_getter {
+    (
+        $type:ty, $func:ident
+    ) => {
+        paste::paste! {
+            #[no_mangle]
+            extern "C" fn [< $type:lower _ $func >](ptr: ExternPointer<$type>) -> OwnedPtr<c_char> {
+                std::ffi::CString::new(ptr.as_ref().$func().str()).unwrap().into_raw()
+            }
+        }
+    };
+}
+
+macro_rules! ffi_vec_value_getters {
+    (
+        $type:ty, $func:ident, $returns: ty
+    ) => {
+        paste::paste! {
+            #[no_mangle]
+            extern "C" fn [< $type:lower _ $func _length>](ptr: ExternPointer<$type>) -> usize {
+                ptr.as_ref().$func().len()
+            }
+            #[no_mangle]
+            extern "C" fn [< $type:lower _ $func _get>](ptr: ExternPointer<$type>, index: usize) -> $returns {
+                *ptr.as_ref().$func().get(index).unwrap()
+            }
+        }
+    };
+}
+
+macro_rules! ffi_vec_stringkey_getters {
+    (
+        $type:ident, $func:ident
+    ) => {
+        paste::paste! {
+            #[no_mangle]
+            extern "C" fn [< $type:lower _ $func _length>](ptr: ExternPointer<$type>) -> usize {
+                ptr.as_ref().$func().len()
+            }
+            #[no_mangle]
+            extern "C" fn [< $type:lower _ $func _get>](ptr: ExternPointer<$type>, index: usize) -> OwnedPtr<c_char> {
+                CString::new(ptr.as_ref().$func().get(index).unwrap().str()).unwrap().into_raw()
+            }
+        }
+    };
+}
+
+pub(self) use ffi_getter;
+pub(self) use ffi_stringkey_getter;
+pub(self) use ffi_vec_stringkey_getters;
+pub(self) use ffi_vec_value_getters;
+
+#[repr(C)]
+pub(self) struct ExternPointer<T: ?Sized> {
+    ptr: *mut T,
+}
+
+impl<T: ?Sized> ExternPointer<T> {
+    pub(self) fn as_ref(&self) -> &T {
+        unsafe {
+            self.ptr.as_ref().expect(&format!(
+                "Given pointer of type '{}' was null",
+                std::any::type_name::<T>()
+            ))
+        }
+    }
+
+    pub(self) fn as_mut(&self) -> &mut T {
+        unsafe {
+            self.ptr.as_mut().expect(&format!(
+                "Given pointer of type '{}' was null",
+                std::any::type_name::<T>()
+            ))
+        }
+    }
+}
+
+impl<T> Into<ExternPointer<T>> for *mut T {
+    fn into(self) -> ExternPointer<T> {
+        ExternPointer { ptr: self }
+    }
+}

src/ffi/static_data/ability.rs

@@ -0,0 +1,53 @@
+use crate::ffi::{BorrowedPtr, ExternPointer, OwnedPtr};
+use crate::static_data::{Ability, EffectParameter};
+use crate::StringKey;
+use std::ffi::{c_char, CStr, CString};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+unsafe extern "C" fn ability_new(
+    name: *const c_char,
+    effect: *const c_char,
+    parameters: *const OwnedPtr<EffectParameter>,
+    parameters_length: usize,
+) -> OwnedPtr<Ability> {
+    let parameters = std::slice::from_raw_parts(parameters, parameters_length);
+    let mut parameters_vec: Vec<EffectParameter> = Vec::with_capacity(parameters_length);
+    for parameter in parameters {
+        parameters_vec.push(*Box::from_raw(*parameter));
+    }
+
+    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let effect: StringKey = CStr::from_ptr(effect).to_str().unwrap().into();
+
+    Box::into_raw(Box::new(Ability::new(&name, &effect, parameters_vec)))
+}
+
+#[no_mangle]
+unsafe extern "C" fn ability_drop(ptr: OwnedPtr<Ability>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+unsafe extern "C" fn ability_name(ptr: ExternPointer<Ability>) -> OwnedPtr<c_char> {
+    CString::new(ptr.as_ref().name().str()).unwrap().into_raw()
+}
+
+#[no_mangle]
+unsafe extern "C" fn ability_effect(ptr: ExternPointer<Ability>) -> OwnedPtr<c_char> {
+    CString::new(ptr.as_ref().effect().str()).unwrap().into_raw()
+}
+
+#[no_mangle]
+unsafe extern "C" fn ability_parameter_length(ptr: ExternPointer<Ability>) -> usize {
+    ptr.as_ref().parameters().len()
+}
+
+#[no_mangle]
+unsafe extern "C" fn ability_parameter_get(ptr: ExternPointer<Ability>, index: usize) -> BorrowedPtr<EffectParameter> {
+    if let Some(p) = ptr.as_ref().parameters().get(index) {
+        p as *const EffectParameter
+    } else {
+        std::ptr::null()
+    }
+}

src/ffi/static_data/form.rs

@@ -0,0 +1,90 @@
+use crate::ffi::{ffi_getter, ffi_vec_stringkey_getters, ffi_vec_value_getters, BorrowedPtr, ExternPointer, OwnedPtr};
+use crate::static_data::{Form, LearnableMoves, StaticStatisticSet, TypeIdentifier};
+use crate::StringKey;
+use hashbrown::HashSet;
+use std::ffi::{c_char, CStr, CString};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+unsafe extern "C" fn form_new(
+    name: *const c_char,
+    height: f32,
+    weight: f32,
+    base_experience: u32,
+    types: *const TypeIdentifier,
+    types_length: usize,
+    base_stats: OwnedPtr<StaticStatisticSet<u16>>,
+    abilities: *const BorrowedPtr<c_char>,
+    abilities_length: usize,
+    hidden_abilities: *const BorrowedPtr<c_char>,
+    hidden_abilities_length: usize,
+    moves: OwnedPtr<LearnableMoves>,
+    flags: *const *const c_char,
+    flags_length: usize,
+) -> OwnedPtr<Form> {
+    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+
+    let abilities = std::slice::from_raw_parts(abilities, abilities_length);
+    let mut abilities_vec = Vec::with_capacity(abilities_length);
+    for ability in abilities {
+        abilities_vec.push(CStr::from_ptr(*ability).into())
+    }
+    let hidden_abilities = std::slice::from_raw_parts(hidden_abilities, hidden_abilities_length);
+    let mut hidden_abilities_vec = Vec::with_capacity(hidden_abilities_length);
+    for ability in hidden_abilities {
+        hidden_abilities_vec.push(CStr::from_ptr(*ability).into())
+    }
+
+    let flags = std::slice::from_raw_parts(flags, flags_length);
+    let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
+    for flag in flags {
+        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+    }
+
+    Box::into_raw(Box::new(Form::new(
+        &name,
+        height,
+        weight,
+        base_experience,
+        std::slice::from_raw_parts(types, types_length).to_vec(),
+        *Box::from_raw(base_stats),
+        abilities_vec,
+        hidden_abilities_vec,
+        *Box::from_raw(moves),
+        flags_set,
+    )))
+}
+
+#[no_mangle]
+unsafe extern "C" fn form_drop(ptr: OwnedPtr<Form>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+unsafe extern "C" fn form_name(ptr: ExternPointer<Form>) -> OwnedPtr<c_char> {
+    let name = ptr.as_ref().name();
+    CString::new(name.str()).unwrap().into_raw()
+}
+
+ffi_getter!(Form, height, f32);
+ffi_getter!(Form, weight, f32);
+ffi_getter!(Form, base_experience, u32);
+
+ffi_vec_value_getters!(Form, types, TypeIdentifier);
+
+ffi_getter!(Form, base_stats, BorrowedPtr<StaticStatisticSet<u16>>);
+
+ffi_vec_stringkey_getters!(Form, abilities);
+ffi_vec_stringkey_getters!(Form, hidden_abilities);
+
+ffi_getter!(Form, moves, BorrowedPtr<LearnableMoves>);
+
+#[no_mangle]
+unsafe extern "C" fn form_has_flag(ptr: ExternPointer<Form>, flag: *const c_char) -> u8 {
+    let flag = CStr::from_ptr(flag).into();
+    if ptr.as_ref().has_flag(&flag) {
+        1
+    } else {
+        0
+    }
+}

src/ffi/static_data/growth_rate.rs

@@ -0,0 +1,27 @@
+use crate::defines::LevelInt;
+use crate::ffi::{ExternPointer, OwnedPtr};
+use crate::static_data::{GrowthRate, LookupGrowthRate};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+unsafe extern "C" fn growth_rate_lookup_new(array: *const u32, length: usize) -> OwnedPtr<LookupGrowthRate> {
+    let array = std::slice::from_raw_parts(array, length);
+    Box::into_raw(Box::new(LookupGrowthRate::new(array.to_vec())))
+}
+
+#[no_mangle]
+unsafe extern "C" fn growth_rate_lookup_drop(ptr: OwnedPtr<LookupGrowthRate>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+#[allow(improper_ctypes_definitions)]
+extern "C" fn growth_rate_calculate_level(ptr: ExternPointer<dyn GrowthRate>, experience: u32) -> LevelInt {
+    ptr.as_ref().calculate_level(experience)
+}
+
+#[no_mangle]
+#[allow(improper_ctypes_definitions)]
+extern "C" fn growth_rate_calculate_experience(ptr: ExternPointer<dyn GrowthRate>, level: LevelInt) -> u32 {
+    ptr.as_ref().calculate_experience(level)
+}

src/ffi/static_data/item.rs

@@ -0,0 +1,49 @@
+use crate::ffi::{ffi_getter, ExternPointer, OwnedPtr};
+use crate::static_data::{BattleItemCategory, Item, ItemCategory};
+use crate::StringKey;
+use hashbrown::HashSet;
+use std::ffi::{c_char, CStr, CString};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+unsafe extern "C" fn item_new(
+    name: *const c_char,
+    category: ItemCategory,
+    battle_category: BattleItemCategory,
+    price: i32,
+    flags: *const *const c_char,
+    flags_length: usize,
+) -> OwnedPtr<Item> {
+    let flags = std::slice::from_raw_parts(flags, flags_length);
+    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
+    for flag in flags {
+        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+    }
+    Box::into_raw(Box::new(Item::new(&name, category, battle_category, price, flags_set)))
+}
+
+#[no_mangle]
+unsafe extern "C" fn item_drop(ptr: OwnedPtr<Item>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+unsafe extern "C" fn item_name(ptr: ExternPointer<Item>) -> OwnedPtr<c_char> {
+    let name = ptr.as_ref().name();
+    CString::new(name.str()).unwrap().into_raw()
+}
+
+ffi_getter!(Item, category, ItemCategory);
+ffi_getter!(Item, battle_category, BattleItemCategory);
+ffi_getter!(Item, price, i32);
+
+#[no_mangle]
+unsafe extern "C" fn item_has_flag(ptr: ExternPointer<Item>, flag: *const c_char) -> u8 {
+    let flag = CStr::from_ptr(flag).into();
+    if ptr.as_ref().has_flag(&flag) {
+        1
+    } else {
+        0
+    }
+}

src/ffi/static_data/learnable_moves.rs

@@ -0,0 +1,24 @@
+use crate::defines::LevelInt;
+use crate::ffi::{BorrowedPtr, ExternPointer, OwnedPtr};
+use crate::static_data::LearnableMoves;
+use std::ffi::{c_char, CStr};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+extern "C" fn learnable_moves_new() -> OwnedPtr<LearnableMoves> {
+    Box::into_raw(Box::new(LearnableMoves::new()))
+}
+
+#[no_mangle]
+unsafe extern "C" fn learnable_moves_drop(ptr: OwnedPtr<LearnableMoves>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+unsafe extern "C" fn learnable_moves_add_level_move(
+    ptr: ExternPointer<LearnableMoves>,
+    level: LevelInt,
+    move_name: BorrowedPtr<c_char>,
+) {
+    ptr.as_mut().add_level_move(level, &CStr::from_ptr(move_name).into())
+}

src/ffi/static_data/mod.rs

@@ -0,0 +1,87 @@
+use crate::ffi::{ExternPointer, OwnedPtr};
+use crate::static_data::EffectParameter;
+use std::ffi::{c_char, CStr, CString};
+use std::ptr::drop_in_place;
+
+mod ability;
+mod form;
+mod growth_rate;
+mod item;
+mod learnable_moves;
+mod move_data;
+mod nature;
+mod species;
+mod statistic_set;
+
+#[no_mangle]
+extern "C" fn effect_parameter_new_bool(value: u8) -> OwnedPtr<EffectParameter> {
+    Box::into_raw(Box::new(EffectParameter::Bool(value == 1)))
+}
+
+#[no_mangle]
+extern "C" fn effect_parameter_new_int(value: i64) -> OwnedPtr<EffectParameter> {
+    Box::into_raw(Box::new(EffectParameter::Int(value)))
+}
+
+#[no_mangle]
+extern "C" fn effect_parameter_new_float(value: f32) -> OwnedPtr<EffectParameter> {
+    Box::into_raw(Box::new(EffectParameter::Float(value)))
+}
+
+#[no_mangle]
+unsafe extern "C" fn effect_parameter_new_string(value: *const c_char) -> OwnedPtr<EffectParameter> {
+    Box::into_raw(Box::new(EffectParameter::String(
+        CStr::from_ptr(value).to_str().unwrap().into(),
+    )))
+}
+
+#[no_mangle]
+unsafe extern "C" fn effect_parameter_drop(ptr: OwnedPtr<EffectParameter>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+extern "C" fn effect_parameter_get_type(ptr: ExternPointer<EffectParameter>) -> u8 {
+    match ptr.as_ref() {
+        EffectParameter::Bool(_) => 0,
+        EffectParameter::Int(_) => 1,
+        EffectParameter::Float(_) => 2,
+        EffectParameter::String(_) => 3,
+    }
+}
+
+#[no_mangle]
+extern "C" fn effect_parameter_get_as_bool(ptr: ExternPointer<EffectParameter>) -> u8 {
+    let p = ptr.as_ref();
+    if let EffectParameter::Bool(b) = p {
+        return if *b { 1 } else { 0 };
+    }
+    panic!("Unexpected effect parameter. Expected bool, was: {}", p);
+}
+
+#[no_mangle]
+extern "C" fn effect_parameter_get_as_int(ptr: ExternPointer<EffectParameter>) -> i64 {
+    let p = ptr.as_ref();
+    if let EffectParameter::Int(b) = p {
+        return *b;
+    }
+    panic!("Unexpected effect parameter. Expected int, was: {}", p);
+}
+
+#[no_mangle]
+extern "C" fn effect_parameter_get_as_float(ptr: ExternPointer<EffectParameter>) -> f32 {
+    let p = ptr.as_ref();
+    if let EffectParameter::Float(b) = p {
+        return *b;
+    }
+    panic!("Unexpected effect parameter. Expected float, was: {}", p);
+}
+
+#[no_mangle]
+extern "C" fn effect_parameter_get_as_string(ptr: ExternPointer<EffectParameter>) -> OwnedPtr<c_char> {
+    let p = ptr.as_ref();
+    if let EffectParameter::String(b) = p {
+        return CString::new(b.str().to_string()).unwrap().into_raw();
+    }
+    panic!("Unexpected effect parameter. Expected string, was: {}", p);
+}

src/ffi/static_data/move_data.rs

@@ -0,0 +1,133 @@
+use crate::ffi::{ffi_getter, BorrowedPtr, ExternPointer, OwnedPtr};
+use crate::static_data::{EffectParameter, MoveCategory, MoveData, MoveTarget, SecondaryEffect, TypeIdentifier};
+use crate::StringKey;
+use hashbrown::HashSet;
+use std::ffi::{c_char, CStr, CString};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+unsafe extern "C" fn move_data_new(
+    name: *const c_char,
+    move_type: TypeIdentifier,
+    category: MoveCategory,
+    base_power: u8,
+    accuracy: u8,
+    base_usages: u8,
+    target: MoveTarget,
+    priority: i8,
+    secondary_effect: *mut SecondaryEffect,
+    flags: *const *const c_char,
+    flags_length: usize,
+) -> OwnedPtr<MoveData> {
+    let flags = std::slice::from_raw_parts(flags, flags_length);
+    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
+    for flag in flags {
+        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+    }
+    let secondary_effect = if secondary_effect.is_null() {
+        None
+    } else {
+        Some(*Box::from_raw(secondary_effect))
+    };
+    Box::into_raw(Box::new(MoveData::new(
+        &name,
+        move_type,
+        category,
+        base_power,
+        accuracy,
+        base_usages,
+        target,
+        priority,
+        secondary_effect,
+        flags_set,
+    )))
+}
+
+#[no_mangle]
+unsafe extern "C" fn move_data_drop(ptr: OwnedPtr<MoveData>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+unsafe extern "C" fn move_data_name(ptr: ExternPointer<MoveData>) -> OwnedPtr<c_char> {
+    let name = ptr.as_ref().name();
+    CString::new(name.str()).unwrap().into_raw()
+}
+
+ffi_getter!(MoveData, move_type, TypeIdentifier);
+ffi_getter!(MoveData, category, MoveCategory);
+ffi_getter!(MoveData, base_power, u8);
+ffi_getter!(MoveData, accuracy, u8);
+ffi_getter!(MoveData, base_usages, u8);
+ffi_getter!(MoveData, target, MoveTarget);
+ffi_getter!(MoveData, priority, i8);
+
+#[no_mangle]
+unsafe extern "C" fn move_data_secondary_effect(ptr: ExternPointer<MoveData>) -> BorrowedPtr<SecondaryEffect> {
+    let effect = ptr.as_ref().secondary_effect();
+    if let Some(v) = effect {
+        v as *const SecondaryEffect
+    } else {
+        std::ptr::null()
+    }
+}
+
+#[no_mangle]
+unsafe extern "C" fn move_data_has_flag(ptr: ExternPointer<MoveData>, flag: *const c_char) -> u8 {
+    let flag = CStr::from_ptr(flag).into();
+    if ptr.as_ref().has_flag(&flag) {
+        1
+    } else {
+        0
+    }
+}
+
+#[no_mangle]
+unsafe extern "C" fn secondary_effect_new(
+    chance: f32,
+    effect_name: BorrowedPtr<c_char>,
+    parameters: *mut OwnedPtr<EffectParameter>,
+    parameters_length: usize,
+) -> OwnedPtr<SecondaryEffect> {
+    let parameter_slice = std::slice::from_raw_parts(parameters, parameters_length);
+    let mut parameters = Vec::with_capacity(parameters_length);
+    for parameter in parameter_slice {
+        parameters.push(*Box::from_raw(*parameter))
+    }
+
+    Box::into_raw(Box::new(SecondaryEffect::new(
+        chance,
+        CStr::from_ptr(effect_name).into(),
+        parameters,
+    )))
+}
+
+#[no_mangle]
+unsafe extern "C" fn secondary_effect_drop(ptr: OwnedPtr<SecondaryEffect>) {
+    drop_in_place(ptr)
+}
+
+ffi_getter!(SecondaryEffect, chance, f32);
+
+#[no_mangle]
+unsafe extern "C" fn secondary_effect_effect_name(ptr: ExternPointer<SecondaryEffect>) -> OwnedPtr<c_char> {
+    CString::new(ptr.as_ref().effect_name().str()).unwrap().into_raw()
+}
+
+#[no_mangle]
+unsafe extern "C" fn secondary_effect_parameter_length(ptr: ExternPointer<SecondaryEffect>) -> usize {
+    ptr.as_ref().parameters().len()
+}
+
+#[no_mangle]
+unsafe extern "C" fn secondary_effect_parameter_get(
+    ptr: ExternPointer<SecondaryEffect>,
+    index: usize,
+) -> BorrowedPtr<EffectParameter> {
+    if let Some(v) = ptr.as_ref().parameters().get(index) {
+        v as *const EffectParameter
+    } else {
+        std::ptr::null()
+    }
+}

src/ffi/static_data/nature.rs

@@ -0,0 +1,31 @@
+use crate::ffi::{ffi_getter, ExternPointer, OwnedPtr};
+use crate::static_data::{Nature, Statistic};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+extern "C" fn nature_new(
+    increase_stat: Statistic,
+    decrease_stat: Statistic,
+    increase_modifier: f32,
+    decrease_modifier: f32,
+) -> OwnedPtr<Nature> {
+    Box::into_raw(Box::new(Nature::new(
+        increase_stat,
+        decrease_stat,
+        increase_modifier,
+        decrease_modifier,
+    )))
+}
+
+#[no_mangle]
+unsafe extern "C" fn nature_drop(ptr: OwnedPtr<Nature>) {
+    drop_in_place(ptr)
+}
+
+ffi_getter!(Nature, increased_stat, Statistic);
+ffi_getter!(Nature, decreased_stat, Statistic);
+
+#[no_mangle]
+extern "C" fn nature_get_stat_modifier(ptr: ExternPointer<Nature>, stat: Statistic) -> f32 {
+    ptr.as_ref().get_stat_modifier(stat)
+}

src/ffi/static_data/species.rs

@@ -0,0 +1,62 @@
+use crate::ffi::{ffi_getter, ffi_stringkey_getter, BorrowedPtr, ExternPointer, OwnedPtr};
+use crate::static_data::{Form, Species};
+use crate::StringKey;
+use hashbrown::HashSet;
+use std::ffi::{c_char, CStr};
+use std::sync::Arc;
+
+#[no_mangle]
+unsafe extern "C" fn species_new(
+    id: u16,
+    name: BorrowedPtr<c_char>,
+    gender_rate: f32,
+    growth_rate: BorrowedPtr<c_char>,
+    capture_rate: u8,
+    default_form: OwnedPtr<Form>,
+    flags: *const *const c_char,
+    flags_length: usize,
+) -> OwnedPtr<Species> {
+    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let growth_rate: StringKey = CStr::from_ptr(growth_rate).to_str().unwrap().into();
+
+    let flags = std::slice::from_raw_parts(flags, flags_length);
+    let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
+    for flag in flags {
+        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+    }
+    Box::into_raw(Box::new(Species::new(
+        id,
+        &name,
+        gender_rate,
+        &growth_rate,
+        capture_rate,
+        *Box::from_raw(default_form),
+        flags_set,
+    )))
+}
+
+ffi_getter!(Species, id, u16);
+ffi_stringkey_getter!(Species, name);
+ffi_getter!(Species, gender_rate, f32);
+ffi_stringkey_getter!(Species, growth_rate);
+ffi_getter!(Species, capture_rate, u8);
+
+#[no_mangle]
+unsafe extern "C" fn species_add_form(
+    species: ExternPointer<Species>,
+    name: BorrowedPtr<c_char>,
+    form: OwnedPtr<Form>,
+) {
+    let form = *Box::from_raw(form);
+    species.as_mut().add_form(CStr::from_ptr(name).into(), form)
+}
+
+#[no_mangle]
+unsafe extern "C" fn species_get_form(species: ExternPointer<Species>, name: BorrowedPtr<c_char>) -> BorrowedPtr<Form> {
+    let form = species.as_ref().get_form(&CStr::from_ptr(name).into());
+    if let Some(form) = form {
+        Arc::as_ptr(form)
+    } else {
+        std::ptr::null()
+    }
+}

src/ffi/static_data/statistic_set.rs

@@ -0,0 +1,106 @@
+use crate::ffi::{ExternPointer, OwnedPtr};
+use crate::static_data::{StaticStatisticSet, Statistic, StatisticSet};
+use std::ptr::drop_in_place;
+
+macro_rules! statistic_set {
+    ($num_type:ident) => {
+    paste::paste!{
+
+#[no_mangle]
+extern "C" fn [<statistic_set_ $num_type _new>](
+    hp: $num_type,
+    attack: $num_type,
+    defense: $num_type,
+    special_attack: $num_type,
+    special_defense: $num_type,
+    speed: $num_type,
+) -> OwnedPtr<StatisticSet<$num_type>> {
+    Box::into_raw(Box::new(StatisticSet::new(
+        hp,
+        attack,
+        defense,
+        special_attack,
+        special_defense,
+        speed,
+    )))
+}
+
+#[no_mangle]
+unsafe extern "C" fn [<statistic_set_ $num_type _drop>](ptr: OwnedPtr<StatisticSet<$num_type>>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+extern "C" fn [<statistic_set_ $num_type _get_stat>](ptr: ExternPointer<StatisticSet<$num_type>>, stat: Statistic) -> $num_type {
+    ptr.as_ref().get_stat(stat)
+}
+
+#[no_mangle]
+extern "C" fn [<statistic_set_ $num_type _set_stat>](ptr: ExternPointer<StatisticSet<$num_type>>, stat: Statistic, value: $num_type) {
+    ptr.as_ref().set_stat(stat, value)
+}
+
+#[no_mangle]
+extern "C" fn [<statistic_set_ $num_type _increase_stat>](ptr: ExternPointer<StatisticSet<$num_type>>, stat: Statistic, value: $num_type) {
+    ptr.as_ref().increase_stat(stat, value)
+}
+
+#[no_mangle]
+extern "C" fn [<statistic_set_ $num_type _decrease_stat>](ptr: ExternPointer<StatisticSet<$num_type>>, stat: Statistic, value: $num_type) {
+    ptr.as_ref().decrease_stat(stat, value)
+}
+
+    }
+    };
+}
+
+statistic_set!(u8);
+statistic_set!(u16);
+statistic_set!(u32);
+statistic_set!(i8);
+statistic_set!(i16);
+statistic_set!(i32);
+
+macro_rules! static_statistic_set {
+    ($num_type:ident) => {
+    paste::paste!{
+
+#[no_mangle]
+extern "C" fn [<static_statistic_set_ $num_type _new>](
+    hp: $num_type,
+    attack: $num_type,
+    defense: $num_type,
+    special_attack: $num_type,
+    special_defense: $num_type,
+    speed: $num_type,
+) -> OwnedPtr<StaticStatisticSet<$num_type>> {
+    Box::into_raw(Box::new(StaticStatisticSet::new(
+        hp,
+        attack,
+        defense,
+        special_attack,
+        special_defense,
+        speed,
+    )))
+}
+
+#[no_mangle]
+unsafe extern "C" fn [<static_statistic_set_ $num_type _drop>](ptr: OwnedPtr<StaticStatisticSet<$num_type>>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+extern "C" fn [<static_statistic_set_ $num_type _get_stat>](ptr: ExternPointer<StaticStatisticSet<$num_type>>, stat: Statistic) -> $num_type {
+    ptr.as_ref().get_stat(stat)
+}
+
+    }
+    };
+}
+
+static_statistic_set!(u8);
+static_statistic_set!(u16);
+static_statistic_set!(u32);
+static_statistic_set!(i8);
+static_statistic_set!(i16);
+static_statistic_set!(i32);

src/lib.rs

@@ -28,6 +28,9 @@ pub mod defines;
 /// The dynamic data module holds data that can change during execution, and things that relate to
 /// this. This includes things as Pokemon themselves, battles, etc.
 pub mod dynamic_data;
+/// The Foreign Function Interface allows for non Rust applications to call this library.
+#[cfg(feature = "ffi")]
+mod ffi;
 /// Script implementations handles the different ways that dynamic scripts get loaded during battle.
 pub mod script_implementations;
 /// The static data module holds data that can be set once, and then never change. This includes

src/static_data/libraries/type_library.rs

@@ -6,6 +6,7 @@ use crate::StringKey;
 /// A unique key that can be used to store a reference to a type. Opaque reference to a byte
 /// internally.
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Default, Hash, Atom)]
+#[repr(C)]
 pub struct TypeIdentifier {
     /// The unique internal value.
     val: u8,

src/static_data/mod.rs

@@ -1,3 +1,4 @@
+use crate::StringKey;
 #[doc(inline)]
 pub use growth_rates::*;
 #[doc(inline)]
@@ -14,6 +15,7 @@ pub use species_data::*;
 pub use statistic_set::*;
 #[doc(inline)]
 pub use statistics::*;
+use std::fmt::{Display, Formatter};
 
 /// Growth rates define how fast a Pokemon can level up.
 mod growth_rates;
@@ -31,3 +33,29 @@ mod species_data;
 mod statistic_set;
 /// Statistics are numerical values on Pokemon that are used in battle.
 mod statistics;
+
+/// A parameter for an effect. This is basically a simple way to dynamically store multiple different
+/// primitives on data.
+#[derive(PartialEq, Debug)]
+#[cfg_attr(feature = "wasm", derive(unique_type_id_derive::UniqueTypeId))]
+pub enum EffectParameter {
+    /// A boolean value.
+    Bool(bool),
+    /// An integer value. Stored as a 64 bit int to deal with potentially large numbers.
+    Int(i64),
+    /// A float value. Stored as a 32 bit float.
+    Float(f32),
+    /// A string value.
+    String(StringKey),
+}
+
+impl Display for EffectParameter {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            EffectParameter::Bool(v) => f.write_fmt(format_args!("EffectParameter::Bool({})", v)),
+            EffectParameter::Int(v) => f.write_fmt(format_args!("EffectParameter::Int({})", v)),
+            EffectParameter::Float(v) => f.write_fmt(format_args!("EffectParameter::Float({})", v)),
+            EffectParameter::String(v) => f.write_fmt(format_args!("EffectParameter::String({})", v)),
+        }
+    }
+}

src/static_data/moves/move_data.rs

@@ -9,6 +9,7 @@ use crate::StringKey;
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[repr(u8)]
 pub enum MoveCategory {
     /// A physical move uses the physical attack stats and physical defense stats to calculate damage.
     Physical = 0,
@@ -21,6 +22,7 @@ pub enum MoveCategory {
 /// The move target defines what kind of targets the move can touch.
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[repr(u8)]
 pub enum MoveTarget {
     /// Adjacent allows a move to target any Pokemon that is either directly to the left or right of
     /// the user, opposed to the user, or left or right of the slot that is opposing the user.

src/static_data/moves/secondary_effect.rs

@@ -1,20 +1,6 @@
+use crate::static_data::EffectParameter;
 use crate::StringKey;
 
-/// A parameter for an effect. This is basically a simple way to dynamically store multiple different
-/// primitives on data.
-#[derive(PartialEq, Debug)]
-#[cfg_attr(feature = "wasm", derive(unique_type_id_derive::UniqueTypeId))]
-pub enum EffectParameter {
-    /// A boolean value.
-    Bool(bool),
-    /// An integer value. Stored as a 64 bit int to deal with potentially large numbers.
-    Int(i64),
-    /// A float value. Stored as a 32 bit float.
-    Float(f32),
-    /// A string value.
-    String(StringKey),
-}
-
 /// A secondary effect is an effect on a move that happens after it hits.
 #[derive(PartialEq, Debug)]
 pub struct SecondaryEffect {

src/static_data/natures.rs

@@ -48,9 +48,9 @@ impl Nature {
     /// Calculates the modifier for a given stat. If it's the increased stat, returns the increased
     /// modifier, if it's the decreased stat, returns the decreased modifier. Otherwise returns 1.0
     pub fn get_stat_modifier(&self, stat: Statistic) -> f32 {
-        if stat == self.increase_stat {
+        if stat == self.increase_stat && stat != self.decrease_stat {
             self.increase_modifier
-        } else if stat == self.decrease_stat {
+        } else if stat == self.decrease_stat && stat != self.increase_stat {
             self.decrease_modifier
         } else {
             1.0

src/utils/string_key.rs

@@ -42,8 +42,7 @@ impl StringKey {
     /// Creates a new StringKey. If we can find a value for this StringKey in the cache, we re-use
     /// that value.
     pub fn new(s: &str) -> Self {
-        let s: ArcStr = s.into();
-        let hash = StringKey::get_hash(s.as_str());
+        let hash = Self::get_hash(s);
         {
             let cache_read = STRING_CACHE.read();
             let cached_value = cache_read.get(&hash);
@@ -55,8 +54,15 @@ impl StringKey {
             }
         }
         {
-            let v = Self { str: s.clone(), hash };
             let mut cache_write = STRING_CACHE.write();
+            if let Some(cached_value) = cache_write.get(&hash) {
+                return Self {
+                    str: cached_value.clone(),
+                    hash,
+                };
+            }
+            let s: ArcStr = s.into();
+            let v = Self { str: s.clone(), hash };
             cache_write.insert(hash, s);
             v
         }
@@ -112,7 +118,7 @@ impl Display for StringKey {
 
 impl Into<StringKey> for &CStr {
     fn into(self) -> StringKey {
-        StringKey::new(self.to_str().unwrap().into())
+        StringKey::new(self.to_str().unwrap())
     }
 }
 /// Converts a character to lowercased in a const safe way.