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use crate::Node;
use std::cell::{Cell, RefCell, RefMut};
use std::marker::PhantomData;
#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
pub struct IntNode<const N: u32>;
impl<'i, const N: u32, I> Node<'i, I> for IntNode<N> {
type Output = u32;
#[inline(always)]
fn eval(&'i self, _input: I) -> Self::Output {
N
}
}
#[derive(Default, Debug, Clone, Copy)]
pub struct ValueNode<T>(pub T);
impl<'i, T: 'i, I> Node<'i, I> for ValueNode<T> {
type Output = &'i T;
#[inline(always)]
fn eval(&'i self, _input: I) -> Self::Output {
&self.0
}
}
impl<T> ValueNode<T> {
pub const fn new(value: T) -> ValueNode<T> {
ValueNode(value)
}
}
impl<T> From<T> for ValueNode<T> {
fn from(value: T) -> Self {
ValueNode::new(value)
}
}
#[derive(Default, Debug, Clone, Copy)]
pub struct AsRefNode<T: AsRef<U>, U>(pub T, PhantomData<U>);
impl<'i, T: 'i + AsRef<U>, U: 'i> Node<'i, ()> for AsRefNode<T, U> {
type Output = &'i U;
#[inline(always)]
fn eval(&'i self, _input: ()) -> Self::Output {
self.0.as_ref()
}
}
impl<T: AsRef<U>, U> AsRefNode<T, U> {
pub const fn new(value: T) -> AsRefNode<T, U> {
AsRefNode(value, PhantomData)
}
}
#[derive(Default, Debug, Clone)]
pub struct RefCellMutNode<T>(pub RefCell<T>);
impl<'i, T: 'i> Node<'i, ()> for RefCellMutNode<T> {
type Output = RefMut<'i, T>;
#[inline(always)]
fn eval(&'i self, _input: ()) -> Self::Output {
let a = self.0.borrow_mut();
a
}
}
impl<T> RefCellMutNode<T> {
pub const fn new(value: T) -> RefCellMutNode<T> {
RefCellMutNode(RefCell::new(value))
}
}
#[derive(Default)]
pub struct OnceCellNode<T>(pub Cell<T>);
impl<'i, T: Default + 'i, I> Node<'i, I> for OnceCellNode<T> {
type Output = T;
#[inline(always)]
fn eval(&'i self, _input: I) -> Self::Output {
self.0.replace(T::default())
}
}
impl<T> OnceCellNode<T> {
pub const fn new(value: T) -> OnceCellNode<T> {
OnceCellNode(Cell::new(value))
}
}
#[derive(Clone, Copy)]
pub struct ClonedNode<T: Clone>(pub T);
impl<'i, T: Clone + 'i, I> Node<'i, I> for ClonedNode<T> {
type Output = T;
#[inline(always)]
fn eval(&'i self, _input: I) -> Self::Output {
self.0.clone()
}
}
impl<T: Clone> ClonedNode<T> {
pub const fn new(value: T) -> ClonedNode<T> {
ClonedNode(value)
}
}
impl<T: Clone> From<T> for ClonedNode<T> {
fn from(value: T) -> Self {
ClonedNode::new(value)
}
}
#[derive(Clone, Copy)]
/// The DebugClonedNode logs every time it is evaluated.
/// This is useful for debugging.
pub struct DebugClonedNode<T: Clone>(pub T);
impl<'i, T: Clone + 'i> Node<'i, ()> for DebugClonedNode<T> {
type Output = T;
#[inline(always)]
fn eval(&'i self, _input: ()) -> Self::Output {
#[cfg(not(target_arch = "spirv"))]
// KEEP THIS `debug!()` - It acts as the output for the debug node itself
log::debug!("DebugClonedNode::eval");
self.0.clone()
}
}
impl<T: Clone> DebugClonedNode<T> {
pub const fn new(value: T) -> DebugClonedNode<T> {
DebugClonedNode(value)
}
}
#[derive(Clone, Copy)]
pub struct CopiedNode<T: Copy>(pub T);
impl<'i, T: Copy + 'i, I> Node<'i, I> for CopiedNode<T> {
type Output = T;
#[inline(always)]
fn eval(&'i self, _input: I) -> Self::Output {
self.0
}
}
impl<T: Copy> CopiedNode<T> {
pub const fn new(value: T) -> CopiedNode<T> {
CopiedNode(value)
}
}
#[derive(Default)]
pub struct DefaultNode<T>(PhantomData<T>);
impl<'i, T: Default + 'i, I> Node<'i, I> for DefaultNode<T> {
type Output = T;
fn eval(&'i self, _input: I) -> Self::Output {
T::default()
}
}
impl<T> DefaultNode<T> {
pub fn new() -> Self {
Self(PhantomData)
}
}
#[repr(C)]
/// Return the unit value
#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
pub struct ForgetNode;
impl<'i, T: 'i> Node<'i, T> for ForgetNode {
type Output = ();
fn eval(&'i self, _input: T) -> Self::Output {}
}
impl ForgetNode {
pub const fn new() -> Self {
ForgetNode
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_int_node() {
let node = IntNode::<5>;
assert_eq!(node.eval(()), 5);
}
#[test]
fn test_value_node() {
let node = ValueNode::new(5);
assert_eq!(node.eval(()), &5);
let type_erased = &node as &dyn for<'a> Node<'a, (), Output = &'a i32>;
assert_eq!(type_erased.eval(()), &5);
}
#[test]
fn test_default_node() {
let node = DefaultNode::<u32>::new();
assert_eq!(node.eval(42), 0);
}
#[test]
#[allow(clippy::unit_cmp)]
fn test_unit_node() {
let node = ForgetNode::new();
assert_eq!(node.eval(()), ());
}
}
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