hashira 0.0.2-alpha

A server side rendering framework build on top of Yew
Documentation 
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use crate::server::{Metadata, PageLinks, PageScripts};
use std::sync::{Arc, Mutex};

#[derive(Clone)]
pub(crate) struct Inner {
    // The <title> of the page.
    pub(crate) title: Option<String>,

    // The `<meta>` tags of the page to render
    pub(crate) metadata: Metadata,

    // the <link> tags of the page to render
    pub(crate) links: PageLinks,

    // the <script> tags of the page to render
    pub(crate) scripts: PageScripts,
}

pub struct PageHead(Arc<Mutex<Inner>>); //

impl PageHead {
    pub(crate) fn new() -> Self {
        let inner = Arc::new(Mutex::new(Inner {
            title: None,
            metadata: Default::default(),
            links: Default::default(),
            scripts: Default::default(),
        }));

        PageHead(inner)
    }

    #[cfg_attr(feature="client", allow(dead_code))]
    pub(crate) fn into_parts(self) -> (Option<String>, Metadata, PageLinks, PageScripts) {
        let mut inner = self.0.lock().unwrap();
        let title = inner.title.take();
        let metadata = inner.metadata.clone();
        let links = inner.links.clone();
        let scripts = inner.scripts.clone();
        (title, metadata, links, scripts)
    }

    /// Adds a `<title>` element to the page head.
    pub fn title(&mut self, title: impl Into<String>) {
        self.0.lock().unwrap().title.replace(title.into());
    }

    /// Adds a `<meta>` element to the page head.
    pub fn metadata(&mut self, metadata: Metadata) {
        self.0.lock().unwrap().metadata.extend(metadata);
    }

    /// Adds a `<link>` element to the page head.
    pub fn links(&mut self, links: PageLinks) {
        self.0.lock().unwrap().links.extend(links);
    }

    /// Adds a `<script>` element to the page body.
    pub fn scripts(&mut self, scripts: PageScripts) {
        self.0.lock().unwrap().scripts.extend(scripts);
    }

    /// Merge the elements of this page head with other,
    /// replacing the elements in this that matches with the other.
    pub fn extend(&mut self, other: Self) {
        let mut this = self.0.lock().unwrap();
        let other = arc_unwrap_or_clone(other.0);

        if other.title.is_some() {
            this.title = other.title;
        }

        this.metadata.extend(other.metadata);
        this.links.extend(other.links);
        this.scripts.extend(other.scripts);
    }

    /// Merge the elements of this page with the other and return the new page head.
    pub fn merge(mut self, other: Self) -> Self {
        self.extend(other);
        self
    }
}

impl Clone for PageHead {
    fn clone(&self) -> Self {
        Self(self.0.clone())
    }
}

impl Default for PageHead {
    fn default() -> Self {
        PageHead::new()
    }
}

fn arc_unwrap_or_clone<T: Clone>(this: Arc<Mutex<T>>) -> T {
    match Arc::try_unwrap(this) {
        Ok(x) => x.into_inner().unwrap(),
        Err(arc) => {
            let inner = &*arc.lock().unwrap();
            inner.clone()
        }
    }
}