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use crate::Node;
use std::marker::PhantomData;
// TODO: Rename to "Passthrough"
/// Passes-through the input value without changing it. This is useful for rerouting wires for organization purposes.
#[node_macro::node(skip_impl)]
fn identity<'i, T: 'i + Send>(value: T) -> T {
value
}
// Type
// TODO: Document this
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
pub struct TypeNode<N: for<'a> Node<'a, I>, I, O>(pub N, pub PhantomData<(I, O)>);
impl<'i, N, I: 'i, O: 'i> Node<'i, I> for TypeNode<N, I, O>
where
N: for<'n> Node<'n, I, Output = O>,
{
type Output = O;
fn eval(&'i self, input: I) -> Self::Output {
self.0.eval(input)
}
fn reset(&self) {
self.0.reset();
}
fn serialize(&self) -> Option<std::sync::Arc<dyn std::any::Any + Send + Sync>> {
self.0.serialize()
}
}
impl<'i, N: for<'a> Node<'a, I>, I: 'i> TypeNode<N, I, <N as Node<'i, I>>::Output> {
pub fn new(node: N) -> Self {
Self(node, PhantomData)
}
}
impl<'i, N: for<'a> Node<'a, I> + Clone, I: 'i> Clone for TypeNode<N, I, <N as Node<'i, I>>::Output> {
fn clone(&self) -> Self {
Self(self.0.clone(), self.1)
}
}
impl<'i, N: for<'a> Node<'a, I> + Copy, I: 'i> Copy for TypeNode<N, I, <N as Node<'i, I>>::Output> {}
// Into
pub struct IntoNode<O>(PhantomData<O>);
impl<O> IntoNode<O> {
pub const fn new() -> Self {
Self(PhantomData)
}
}
impl<O> Default for IntoNode<O> {
fn default() -> Self {
Self::new()
}
}
impl<'input, I: 'input, O: 'input> Node<'input, I> for IntoNode<O>
where
I: Into<O> + Sync + Send,
{
type Output = dyn_any::DynFuture<'input, O>;
#[inline]
fn eval(&'input self, input: I) -> Self::Output {
Box::pin(async move { input.into() })
}
}
/// The [`Convert`] trait allows for conversion between Rust primitive numeric types.
/// Because number casting is lossy, we cannot use the normal [`Into`] trait like we do for other types.
pub trait Convert<T>: Sized {
/// Converts this type into the (usually inferred) output type.
#[must_use]
fn convert(self) -> T;
}
impl<T: ToString> Convert<String> for T {
/// Converts this type into a `String` using its `ToString` implementation.
#[inline]
fn convert(self) -> String {
self.to_string()
}
}
/// Implements the [`Convert`] trait for conversion between the cartesian product of Rust's primitive numeric types.
macro_rules! impl_convert {
($from:ty, $to:ty) => {
impl Convert<$to> for $from {
fn convert(self) -> $to {
self as $to
}
}
};
($to:ty) => {
impl_convert!(f32, $to);
impl_convert!(f64, $to);
impl_convert!(i8, $to);
impl_convert!(u8, $to);
impl_convert!(u16, $to);
impl_convert!(i16, $to);
impl_convert!(i32, $to);
impl_convert!(u32, $to);
impl_convert!(i64, $to);
impl_convert!(u64, $to);
impl_convert!(i128, $to);
impl_convert!(u128, $to);
impl_convert!(isize, $to);
impl_convert!(usize, $to);
};
}
impl_convert!(f32);
impl_convert!(f64);
impl_convert!(i8);
impl_convert!(u8);
impl_convert!(u16);
impl_convert!(i16);
impl_convert!(i32);
impl_convert!(u32);
impl_convert!(i64);
impl_convert!(u64);
impl_convert!(i128);
impl_convert!(u128);
impl_convert!(isize);
impl_convert!(usize);
// Convert
pub struct ConvertNode<O>(PhantomData<O>);
impl<_O> ConvertNode<_O> {
pub const fn new() -> Self {
Self(core::marker::PhantomData)
}
}
impl<_O> Default for ConvertNode<_O> {
fn default() -> Self {
Self::new()
}
}
impl<'input, I: 'input + Convert<_O> + Sync + Send, _O: 'input> Node<'input, I> for ConvertNode<_O> {
type Output = ::dyn_any::DynFuture<'input, _O>;
#[inline]
fn eval(&'input self, input: I) -> Self::Output {
Box::pin(async move { input.convert() })
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
pub fn identity_node() {
assert_eq!(identity(&4), &4);
}
}
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