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vnode.rs
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vnode.rs
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#![allow(non_snake_case)]
use js_sys::{Array, JsString};
use wasm_bindgen::JsValue;
/// Represents a node in the virtual DOM of React.
#[non_exhaustive]
#[derive(Debug, Clone)]
pub enum VNode {
/// Represents a single virtual node.
Single(JsValue),
/// Represents an array of virtual nodes.
List(Array),
}
impl VNode {
/// Creates an empty node that doesn't render anything.
pub fn new() -> VNode {
VNode::Single(JsValue::null())
}
/// Adds the given node to the list.
pub fn push(&mut self, node: &VNode) {
match self {
VNode::Single(x) => {
*self = VNode::List({
let arr = Array::new();
if !x.is_null() {
arr.push(x);
}
arr.push(node.as_ref());
arr
});
}
VNode::List(arr) => {
arr.push(node.as_ref());
}
}
}
}
impl Default for VNode {
fn default() -> Self {
Self::new()
}
}
impl AsRef<JsValue> for VNode {
fn as_ref(&self) -> &JsValue {
match self {
VNode::Single(x) => x,
VNode::List(x) => x,
}
}
}
impl From<VNode> for JsValue {
fn from(value: VNode) -> Self {
match value {
VNode::Single(x) => x,
VNode::List(x) => x.into(),
}
}
}
impl<T: Into<VNode>> From<Option<T>> for VNode {
fn from(value: Option<T>) -> Self {
value.map(|value| value.into()).unwrap_or_default()
}
}
impl Extend<VNode> for VNode {
fn extend<T: IntoIterator<Item = VNode>>(&mut self, iter: T) {
for node in iter.into_iter() {
self.push(&node);
}
}
}
impl FromIterator<VNode> for VNode {
fn from_iter<T: IntoIterator<Item = VNode>>(iter: T) -> Self {
let mut result = Self::new();
for node in iter.into_iter() {
result.push(&node);
}
result
}
}
macro_rules! impl_into_vnode {
{ $( $T:ty ),* $(,)? } => {
$(
impl From<$T> for VNode {
fn from(value: $T) -> Self {
VNode::Single(value.into())
}
}
)*
};
}
// Implement `Into<VNode>` for as many `Display` types as possible
impl_into_vnode! {
&str, String, JsString,
f32, f64,
i8, i16, i32, i64, i128, isize,
u8, u16, u32, u64, u128, usize,
}
impl From<()> for VNode {
fn from(_: ()) -> Self {
VNode::new()
}
}
macro_rules! impl_into_vnode_for_tuples {
(@impl) => {};
(@impl $( $x:ident ),+) => {
impl<$( $x, )+> From<($( $x, )+)> for VNode
where $( $x: Into<VNode>, )+
{
fn from(($( $x, )+): ($( $x, )+)) -> VNode {
let mut result = VNode::new();
$( result.push(&$x.into()); )+
result
}
}
impl_into_vnode_for_tuples!(@next $( $x ),+);
};
(@next $first:ident) => {};
(@next $first:ident, $( $tt:tt )*) => {
impl_into_vnode_for_tuples!(@impl $( $tt )*);
};
($( $x:ident ),*) => {
impl_into_vnode_for_tuples!(@impl $( $x ),*);
}
}
impl_into_vnode_for_tuples!(
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
);