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//! Trait to build a custom type for use with [`Engine`].
use crate::{types::dynamic::Variant, Engine, Identifier, RegisterNativeFunction};
use std::marker::PhantomData;
#[cfg(feature = "no_std")]
use std::prelude::v1::*;
#[cfg(any(not(feature = "no_index"), not(feature = "no_object")))]
use crate::func::register::Mut;
/// Trait to build the API of a custom type for use with an [`Engine`]
/// (i.e. register the type and its getters, setters, methods, etc.).
///
/// # Example
///
/// ```
/// use rhai::{CustomType, TypeBuilder, Engine};
///
/// #[derive(Debug, Clone, Eq, PartialEq)]
/// struct TestStruct {
/// field: i64
/// }
///
/// impl TestStruct {
/// fn new() -> Self {
/// Self { field: 1 }
/// }
/// fn update(&mut self, offset: i64) {
/// self.field += offset;
/// }
/// fn get_value(&mut self) -> i64 {
/// self.field
/// }
/// fn set_value(&mut self, value: i64) {
/// self.field = value;
/// }
/// }
///
/// impl CustomType for TestStruct {
/// fn build(mut builder: TypeBuilder<Self>) {
/// builder
/// .with_name("TestStruct")
/// .with_fn("new_ts", Self::new)
/// .with_fn("update", Self::update);
/// }
/// }
///
/// # fn main() -> Result<(), Box<rhai::EvalAltResult>> {
///
/// let mut engine = Engine::new();
///
/// // Register API for the custom type.
/// engine.build_type::<TestStruct>();
///
///
/// # #[cfg(not(feature = "no_object"))]
/// assert_eq!(
/// engine.eval::<TestStruct>("let x = new_ts(); x.update(41); x")?,
/// TestStruct { field: 42 }
/// );
/// # Ok(())
/// # }
/// ```
pub trait CustomType: Variant + Clone {
/// Builds the custom type for use with the [`Engine`].
///
/// Methods, property getters/setters, indexers etc. should be registered in this function.
fn build(builder: TypeBuilder<Self>);
}
impl Engine {
/// Build the API of a custom type for use with the [`Engine`].
///
/// The custom type must implement [`CustomType`].
#[inline]
pub fn build_type<T: CustomType>(&mut self) -> &mut Self {
T::build(TypeBuilder::new(self));
self
}
}
/// Builder to build the API of a custom type for use with an [`Engine`].
///
/// The type is automatically registered when this builder is dropped.
///
/// ## Pretty-Print Name
///
/// By default the type is registered with [`Engine::register_type`] (i.e. without a pretty-print name).
///
/// To define a pretty-print name, call [`with_name`][`TypeBuilder::with_name`],
/// to use [`Engine::register_type_with_name`] instead.
#[must_use]
pub struct TypeBuilder<'a, T: Variant + Clone> {
engine: &'a mut Engine,
name: Option<&'static str>,
_marker: PhantomData<T>,
}
impl<'a, T: Variant + Clone> TypeBuilder<'a, T> {
/// Create a [`TypeBuilder`] linked to a particular [`Engine`] instance.
#[inline(always)]
fn new(engine: &'a mut Engine) -> Self {
Self {
engine,
name: None,
_marker: PhantomData,
}
}
}
impl<'a, T: Variant + Clone> TypeBuilder<'a, T> {
/// Set a pretty-print name for the `type_of` function.
#[inline(always)]
pub fn with_name(&mut self, name: &'static str) -> &mut Self {
self.name = Some(name);
self
}
/// Register a custom function.
#[inline(always)]
pub fn with_fn<A: 'static, const N: usize, const C: bool, R: Variant + Clone, const L: bool>(
&mut self,
name: impl AsRef<str> + Into<Identifier>,
method: impl RegisterNativeFunction<A, N, C, R, L>,
) -> &mut Self {
self.engine.register_fn(name, method);
self
}
}
impl<'a, T> TypeBuilder<'a, T>
where
T: Variant + Clone + IntoIterator,
<T as IntoIterator>::Item: Variant + Clone,
{
/// Register a type iterator.
/// This is an advanced API.
#[inline(always)]
pub fn is_iterable(&mut self) -> &mut Self {
self.engine.register_iterator::<T>();
self
}
}
#[cfg(not(feature = "no_object"))]
impl<'a, T: Variant + Clone> TypeBuilder<'a, T> {
/// Register a getter function.
///
/// The function signature must start with `&mut self` and not `&self`.
///
/// Not available under `no_object`.
#[inline(always)]
pub fn with_get<const C: bool, V: Variant + Clone, const L: bool>(
&mut self,
name: impl AsRef<str>,
get_fn: impl RegisterNativeFunction<(Mut<T>,), 1, C, V, L> + crate::func::SendSync + 'static,
) -> &mut Self {
self.engine.register_get(name, get_fn);
self
}
/// Register a setter function.
///
/// Not available under `no_object`.
#[inline(always)]
pub fn with_set<const C: bool, V: Variant + Clone, const L: bool>(
&mut self,
name: impl AsRef<str>,
set_fn: impl RegisterNativeFunction<(Mut<T>, V), 2, C, (), L> + crate::func::SendSync + 'static,
) -> &mut Self {
self.engine.register_set(name, set_fn);
self
}
/// Short-hand for registering both getter and setter functions.
///
/// All function signatures must start with `&mut self` and not `&self`.
///
/// Not available under `no_object`.
#[inline(always)]
pub fn with_get_set<
const C1: bool,
const C2: bool,
V: Variant + Clone,
const L1: bool,
const L2: bool,
>(
&mut self,
name: impl AsRef<str>,
get_fn: impl RegisterNativeFunction<(Mut<T>,), 1, C1, V, L1> + crate::func::SendSync + 'static,
set_fn: impl RegisterNativeFunction<(Mut<T>, V), 2, C2, (), L2>
+ crate::func::SendSync
+ 'static,
) -> &mut Self {
self.engine.register_get_set(name, get_fn, set_fn);
self
}
}
#[cfg(any(not(feature = "no_index"), not(feature = "no_object")))]
impl<'a, T: Variant + Clone> TypeBuilder<'a, T> {
/// Register an index getter.
///
/// The function signature must start with `&mut self` and not `&self`.
///
/// Not available under both `no_index` and `no_object`.
#[inline(always)]
pub fn with_indexer_get<
X: Variant + Clone,
const C: bool,
V: Variant + Clone,
const L: bool,
>(
&mut self,
get_fn: impl RegisterNativeFunction<(Mut<T>, X), 2, C, V, L> + crate::func::SendSync + 'static,
) -> &mut Self {
self.engine.register_indexer_get(get_fn);
self
}
/// Register an index setter.
///
/// Not available under both `no_index` and `no_object`.
#[inline(always)]
pub fn with_indexer_set<
X: Variant + Clone,
const C: bool,
V: Variant + Clone,
const L: bool,
>(
&mut self,
set_fn: impl RegisterNativeFunction<(Mut<T>, X, V), 3, C, (), L>
+ crate::func::SendSync
+ 'static,
) -> &mut Self {
self.engine.register_indexer_set(set_fn);
self
}
/// Short-hand for registering both index getter and setter functions.
///
/// Not available under both `no_index` and `no_object`.
#[inline(always)]
pub fn with_indexer_get_set<
X: Variant + Clone,
const C1: bool,
const C2: bool,
V: Variant + Clone,
const L1: bool,
const L2: bool,
>(
&mut self,
get_fn: impl RegisterNativeFunction<(Mut<T>, X), 2, C1, V, L1> + crate::func::SendSync + 'static,
set_fn: impl RegisterNativeFunction<(Mut<T>, X, V), 3, C2, (), L2>
+ crate::func::SendSync
+ 'static,
) -> &mut Self {
self.engine.register_indexer_get_set(get_fn, set_fn);
self
}
}
impl<'a, T: Variant + Clone> Drop for TypeBuilder<'a, T> {
#[inline]
fn drop(&mut self) {
if let Some(name) = self.name {
self.engine.register_type_with_name::<T>(name);
} else {
self.engine.register_type::<T>();
}
}
}