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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>) -> RenderNode;
}
pub enum DoctypeElem {
Word(&'static str),
String(&'static str),
}
pub enum RenderNode {
Doctype(Vec<DoctypeElem>),
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,
}
const VOID_TAGS: [&str; 14] = [
"area", "base", "br", "col", "embed", "hr", "img", "input", "link", "meta", "param", "source",
"track", "wbr",
];
impl RenderNode {
pub(crate) fn render_to_string(self) -> Pin<Box<dyn Future<Output = String>>> {
match self {
RenderNode::Doctype(elements) => {
let strings = elements.iter().map(|elem| match elem {
DoctypeElem::Word(word) => word.to_string(),
DoctypeElem::String(string) => format!("\"{}\"", string),
}).collect::<Vec<_>>().join(" ").clone();
Box::pin(async move {
format!("<!doctype {}>", strings)
})
},
RenderNode::Component(component) => {
let result_root = component.render();
Box::pin(async move {
result_root.render_to_string().await
})
},
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)| {
let corrected_key = key.replace("_", "-");
format!(" {corrected_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("");
let is_void = VOID_TAGS.iter().any(|&s| s == name);
let has_children = rendered_children.trim() != "";
if has_children && is_void {
eprintln!("WARN: <{name}/> is a void tag, and should not have children");
}
if !has_children && is_void {
format!("<{name}{text_attributes}/>")
} else {
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() }),
}
}
}
pub trait IntoRender {
fn into_render(self) -> Vec<RenderNode>;
}
macro_rules! impl_str {
($t:ty) => {
impl IntoRender for $t {
fn into_render(self) -> Vec<RenderNode> {
vec![RenderNode::TextNode { content: String::from(self) }]
}
}
};
}
impl_str!(String);
impl_str!(&str);
impl_str!(std::borrow::Cow<'_,str>);
impl IntoRender for Vec<RenderNode> {
fn into_render(self) -> Vec<RenderNode> {
self
}
}
impl IntoRender for RenderNode {
fn into_render(self) -> Vec<RenderNode> {
vec![self]
}
}
|
