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script: Add infrastructure to track subresource loads in <link> and <style> elements.
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3 changed files with 86 additions and 6 deletions
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@ -62,6 +62,11 @@ pub struct HTMLLinkElement {
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/// https://html.spec.whatwg.org/multipage/#a-style-sheet-that-is-blocking-scripts
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parser_inserted: Cell<bool>,
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/// The number of loads that this link element has triggered (could be more
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/// than one because of imports), and how many of them have finished.
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pending_loads: Cell<u32>,
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/// Whether any of the loads have failed.
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any_failed_load: Cell<bool>,
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}
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impl HTMLLinkElement {
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@ -73,6 +78,8 @@ impl HTMLLinkElement {
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parser_inserted: Cell::new(creator == ElementCreator::ParserCreated),
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stylesheet: DOMRefCell::new(None),
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cssom_stylesheet: MutNullableJS::new(None),
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pending_loads: Cell::new(0),
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any_failed_load: Cell::new(false),
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}
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}
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@ -86,6 +93,16 @@ impl HTMLLinkElement {
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HTMLLinkElementBinding::Wrap)
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}
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pub fn parser_inserted(&self) -> bool {
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self.parser_inserted.get()
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}
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pub fn set_stylesheet(&self, s: Arc<Stylesheet>) {
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assert!(self.stylesheet.borrow().is_none());
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*self.stylesheet.borrow_mut() = Some(s);
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}
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pub fn get_stylesheet(&self) -> Option<Arc<Stylesheet>> {
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self.stylesheet.borrow().clone()
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}
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@ -217,6 +234,28 @@ impl VirtualMethods for HTMLLinkElement {
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impl HTMLLinkElement {
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pub fn increment_pending_loads_count(&self) {
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self.pending_loads.set(self.pending_loads.get() + 1)
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}
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/// Returns None if there are still pending loads, or whether any load has
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/// failed since the loads started.
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pub fn load_finished(&self, succeeded: bool) -> Option<bool> {
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assert!(self.pending_loads.get() > 0, "What finished?");
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if !succeeded {
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self.any_failed_load.set(true);
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}
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self.pending_loads.set(self.pending_loads.get() - 1);
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if self.pending_loads.get() != 0 {
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return None;
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}
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let any_failed = self.any_failed_load.get();
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self.any_failed_load.set(false);
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Some(any_failed)
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}
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/// https://html.spec.whatwg.org/multipage/#concept-link-obtain
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fn handle_stylesheet_url(&self, href: &str) {
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let document = document_from_node(self);
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@ -231,8 +270,11 @@ impl HTMLLinkElement {
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// Step 2.
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let url = match document.base_url().join(href) {
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Err(e) => return debug!("Parsing url {} failed: {}", href, e),
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Ok(url) => url,
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Err(e) => {
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debug!("Parsing url {} failed: {}", href, e);
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return;
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}
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};
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let element = self.upcast::<Element>();
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