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use std::pin::Pin;
use std::collections::HashMap;
use std::future::Future;
use futures::future::join_all;
pub trait Component {
fn render(self: Box<Self>) -> Vec<RenderNode>;
}
pub enum RenderNode {
Suspense {
fallback: Box<RenderNode>,
children: Pin<Box<dyn Future<Output = Vec<RenderNode>>>>
},
Component(Box<dyn Component>),
Element {
name: String,
attributes: HashMap<String, String>,
children: Vec<RenderNode>
},
Fragment {
children: Vec<RenderNode>
},
TextNode {
content: String,
},
Null,
}
impl RenderNode {
pub(crate) fn render_to_string(self) -> Pin<Box<dyn Future<Output = String>>> {
match self {
RenderNode::Component(component) => {
let elements = component.render();
Box::pin((async move || {
join_all(elements.into_iter()
.map(|child| child.render_to_string())
.collect::<Vec<_>>()).await.join("")
})())
},
RenderNode::Suspense {fallback: _, children} => {
Box::pin((async move || {
join_all(children.await.into_iter()
.map(|child| child.render_to_string())).await
.join("")
})())
},
RenderNode::Element { name, attributes, children } => {
let text_attributes = attributes.into_iter()
.map(|(key, value)| format!(" {key}=\"{value}\""))
.collect::<Vec<_>>().join("");
Box::pin((async move || {
let rendered_children = join_all(children.into_iter()
.map(|child| child.render_to_string())
.collect::<Vec<_>>()).await.join("");
format!("<{name}{text_attributes}>{rendered_children}</{name}>")
})())
},
RenderNode::Fragment { children } => {
Box::pin((async move || {
join_all(children.into_iter()
.map(|child| child.render_to_string())).await
.join("")
})())
}
RenderNode::TextNode { content } => Box::pin((async move || content)()),
RenderNode::Null => Box::pin((async move || "".to_string())()),
}
}
}
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