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script: Abstract HTMLLinkElement and StyleElement into StylesheetOwner.

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This commit is contained in:
Emilio Cobos Álvarez 2016-12-16 16:39:58 +01:00
parent 072db0279a
commit b9901fbd89
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GPG key ID: 056B727BB9C1027C
4 changed files with 117 additions and 91 deletions
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73
components/script/stylesheet_loader.rs
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@ -3,15 +3,13 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use document_loader::LoadType;
use dom::bindings::codegen::Bindings::DOMTokenListBinding::DOMTokenListBinding::DOMTokenListMethods;
use dom::bindings::codegen::Bindings::HTMLLinkElementBinding::HTMLLinkElementBinding::HTMLLinkElementMethods;
use dom::bindings::inheritance::Castable;
use dom::bindings::refcounted::Trusted;
use dom::bindings::reflector::DomObject;
use dom::element::Element;
use dom::eventtarget::EventTarget;
use dom::htmlelement::HTMLElement;
use dom::htmllinkelement::HTMLLinkElement;
use dom::htmlstyleelement::HTMLStyleElement;
use dom::node::{document_from_node, window_from_node};
use encoding::EncodingRef;
use encoding::all::UTF_8;
@ -33,6 +31,23 @@ use style::parser::ParserContextExtraData;
use style::stylesheets::{ImportRule, Stylesheet, Origin};
use style::stylesheets::StylesheetLoader as StyleStylesheetLoader;
pub trait StylesheetOwner {
/// Returns whether this element was inserted by the parser (i.e., it should
/// trigger a document-load-blocking load).
fn parser_inserted(&self) -> bool;
/// Which referrer policy should loads triggered by this owner follow, or
/// `None` for the default.
fn referrer_policy(&self) -> Option<ReferrerPolicy>;
/// Notes that a new load is pending to finish.
fn increment_pending_loads_count(&self);
/// Returns None if there are still pending loads, or whether any load has
/// failed since the loads started.
fn load_finished(&self, successful: bool) -> Option<bool>;
}
pub enum StylesheetContextSource {
// NB: `media` is just an option so we avoid cloning it.
LinkElement { media: Option<MediaList>, url: ServoUrl },
@ -146,35 +161,18 @@ impl FetchResponseListener for StylesheetContext {
successful = metadata.status.map_or(false, |(code, _)| code == 200);
}
if let Some(ref link) = elem.downcast::<HTMLLinkElement>() {
if link.parser_inserted() {
document.decrement_script_blocking_stylesheet_count();
}
} else if let Some(ref style) = elem.downcast::<HTMLStyleElement>() {
if style.parser_inserted() {
document.decrement_script_blocking_stylesheet_count();
}
} else {
unreachable!(
"Stylesheet loads can only be triggered by <link> or <style> elements!");
let owner = elem.upcast::<Element>().as_stylesheet_owner()
.expect("Stylesheet not loaded by <style> or <link> element!");
if owner.parser_inserted() {
document.decrement_script_blocking_stylesheet_count();
}
let url = self.source.url();
document.finish_load(LoadType::Stylesheet(url));
if let Some(ref link) = elem.downcast::<HTMLLinkElement>() {
if let Some(any_failed) = link.load_finished(successful) {
let event = if any_failed { atom!("error") } else { atom!("load") };
link.upcast::<EventTarget>().fire_event(event);
}
} else if let Some(ref style) = elem.downcast::<HTMLStyleElement>() {
if let Some(any_failed) = style.load_finished(successful) {
let event = if any_failed { atom!("error") } else { atom!("load") };
style.upcast::<EventTarget>().fire_event(event);
}
} else {
unreachable!(
"Stylesheet loads can only be triggered by <link> or <style> elements!");
if let Some(any_failed) = owner.load_finished(successful) {
let event = if any_failed { atom!("error") } else { atom!("load") };
elem.upcast::<EventTarget>().fire_event(event);
}
}
}
@ -214,20 +212,13 @@ impl<'a> StylesheetLoader<'a> {
});
let mut referrer_policy = document.get_referrer_policy();
if let Some(ref link) = self.elem.downcast::<HTMLLinkElement>() {
link.increment_pending_loads_count();
if link.parser_inserted() {
document.increment_script_blocking_stylesheet_count();
}
if link.RelList().Contains("noreferrer".into()) {
referrer_policy = Some(ReferrerPolicy::NoReferrer);
}
} else if let Some(ref style) = self.elem.downcast::<HTMLStyleElement>() {
style.increment_pending_loads_count();
if style.parser_inserted() {
document.increment_script_blocking_stylesheet_count();
}
let owner = self.elem.upcast::<Element>().as_stylesheet_owner()
.expect("Stylesheet not loaded by <style> or <link> element!");
let referrer_policy = owner.referrer_policy()
.or_else(|| document.get_referrer_policy());
owner.increment_pending_loads_count();
if owner.parser_inserted() {
document.increment_script_blocking_stylesheet_count();
}
let request = RequestInit {