script: Rename StylesheetLoader to ElementStylesheetLoader (#39537)

`StylesheetLoader` implements the `StylesheetLoader` trait from Stylo.
This is pretty confusing as the names are the same. This change renames
the Servo version to `ElementStyleSheet` loader so that it's clearer
from reading the code what each of these things are.

Testing: This change just makes a few renames so shouldn't change test
results.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

components/script/dom/cssrulelist.rs

@@ -29,7 +29,7 @@ use crate::dom::cssstylesheet::CSSStyleSheet;
 use crate::dom::html::htmlelement::HTMLElement;
 use crate::dom::window::Window;
 use crate::script_runtime::CanGc;
-use crate::stylesheet_loader::StylesheetLoader;
+use crate::stylesheet_loader::ElementStylesheetLoader;
 
 unsafe_no_jsmanaged_fields!(RulesSource);
 
@@ -130,7 +130,7 @@ impl CSSRuleList {
             .and_then(DomRoot::downcast::<HTMLElement>);
         let loader = owner
             .as_ref()
-            .map(|element| StylesheetLoader::for_element(element));
+            .map(|element| ElementStylesheetLoader::new(element));
         let allow_import_rules = if self.parent_stylesheet.is_constructed() {
             AllowImportRules::No
         } else {

components/script/dom/html/htmllinkelement.rs

@@ -60,7 +60,7 @@ use crate::dom::virtualmethods::VirtualMethods;
 use crate::links::LinkRelations;
 use crate::network_listener::{PreInvoke, ResourceTimingListener, submit_timing};
 use crate::script_runtime::CanGc;
-use crate::stylesheet_loader::{StylesheetContextSource, StylesheetLoader, StylesheetOwner};
+use crate::stylesheet_loader::{ElementStylesheetLoader, StylesheetContextSource, StylesheetOwner};
 
 #[derive(Clone, Copy, JSTraceable, MallocSizeOf, PartialEq)]
 pub(crate) struct RequestGenerationId(u32);
@@ -589,7 +589,7 @@ impl HTMLLinkElement {
         self.request_generation_id
             .set(self.request_generation_id.get().increment());
 
-        let loader = StylesheetLoader::for_element(self.upcast());
+        let loader = ElementStylesheetLoader::new(self.upcast());
         loader.load(
             StylesheetContextSource::LinkElement { media: Some(media) },
             link_url,

components/script/dom/html/htmlstyleelement.rs

@@ -34,7 +34,7 @@ use crate::dom::stylesheet::StyleSheet as DOMStyleSheet;
 use crate::dom::stylesheetcontentscache::{StylesheetContentsCache, StylesheetContentsCacheKey};
 use crate::dom::virtualmethods::VirtualMethods;
 use crate::script_runtime::CanGc;
-use crate::stylesheet_loader::{StylesheetLoader, StylesheetOwner};
+use crate::stylesheet_loader::{ElementStylesheetLoader, StylesheetOwner};
 
 #[dom_struct]
 pub(crate) struct HTMLStyleElement {
@@ -133,7 +133,7 @@ impl HTMLStyleElement {
             .expect("Element.textContent must be a string");
         let shared_lock = node.owner_doc().style_shared_lock().clone();
         let mq = Arc::new(shared_lock.wrap(self.create_media_list(self.Media().str())));
-        let loader = StylesheetLoader::for_element(self.upcast());
+        let loader = ElementStylesheetLoader::new(self.upcast());
 
         let stylesheetcontents_create_callback = || {
             #[cfg(feature = "tracing")]

components/script/stylesheet_loader.rs

@@ -154,7 +154,7 @@ impl FetchResponseListener for StylesheetContext {
         _: RequestId,
         status: Result<ResourceFetchTiming, NetworkError>,
     ) {
-        let elem = self.elem.root();
+        let element = self.elem.root();
         let document = self.document.root();
         let mut successful = false;
 
@@ -201,12 +201,12 @@ impl FetchResponseListener for StylesheetContext {
             let protocol_encoding_label = metadata.charset.as_deref();
             let final_url = metadata.final_url;
 
-            let win = elem.owner_window();
+            let win = element.owner_window();
 
-            let loader = StylesheetLoader::for_element(&elem);
+            let loader = ElementStylesheetLoader::new(&element);
             match self.source {
                 StylesheetContextSource::LinkElement { ref mut media } => {
-                    let link = elem.downcast::<HTMLLinkElement>().unwrap();
+                    let link = element.downcast::<HTMLLinkElement>().unwrap();
                     // We must first check whether the generations of the context and the element match up,
                     // else we risk applying the wrong stylesheet when responses come out-of-order.
                     let is_stylesheet_load_applicable = self
@@ -268,7 +268,7 @@ impl FetchResponseListener for StylesheetContext {
             successful = metadata.status == http::StatusCode::OK;
         }
 
-        let owner = elem
+        let owner = element
             .upcast::<Element>()
             .as_stylesheet_owner()
             .expect("Stylesheet not loaded by <style> or <link> element!");
@@ -285,7 +285,8 @@ impl FetchResponseListener for StylesheetContext {
             } else {
                 atom!("load")
             };
-            elem.upcast::<EventTarget>()
+            element
+                .upcast::<EventTarget>()
                 .fire_event(event, CanGc::note());
         }
     }
@@ -325,17 +326,17 @@ impl ResourceTimingListener for StylesheetContext {
     }
 }
 
-pub(crate) struct StylesheetLoader<'a> {
+pub(crate) struct ElementStylesheetLoader<'a> {
-    elem: &'a HTMLElement,
+    element: &'a HTMLElement,
 }
 
-impl<'a> StylesheetLoader<'a> {
+impl<'a> ElementStylesheetLoader<'a> {
-    pub(crate) fn for_element(element: &'a HTMLElement) -> Self {
+    pub(crate) fn new(element: &'a HTMLElement) -> Self {
-        StylesheetLoader { elem: element }
+        ElementStylesheetLoader { element }
     }
 }
 
-impl StylesheetLoader<'_> {
+impl ElementStylesheetLoader<'_> {
     pub(crate) fn load(
         &self,
         source: StylesheetContextSource,
@@ -343,17 +344,17 @@ impl StylesheetLoader<'_> {
         cors_setting: Option<CorsSettings>,
         integrity_metadata: String,
     ) {
-        let document = self.elem.owner_document();
+        let document = self.element.owner_document();
         let shadow_root = self
-            .elem
+            .element
             .containing_shadow_root()
             .map(|sr| Trusted::new(&*sr));
         let generation = self
-            .elem
+            .element
             .downcast::<HTMLLinkElement>()
             .map(HTMLLinkElement::get_request_generation_id);
         let context = StylesheetContext {
-            elem: Trusted::new(self.elem),
+            elem: Trusted::new(self.element),
             source,
             url: url.clone(),
             metadata: None,
@@ -366,7 +367,7 @@ impl StylesheetLoader<'_> {
         };
 
         let owner = self
-            .elem
+            .element
             .upcast::<Element>()
             .as_stylesheet_owner()
             .expect("Stylesheet not loaded by <style> or <link> element!");
@@ -377,7 +378,7 @@ impl StylesheetLoader<'_> {
         }
 
         // https://html.spec.whatwg.org/multipage/#default-fetch-and-process-the-linked-resource
-        let global = self.elem.global();
+        let global = self.element.global();
         let request = create_a_potential_cors_request(
             Some(document.webview_id()),
             url.clone(),
@@ -390,7 +391,7 @@ impl StylesheetLoader<'_> {
             global.policy_container(),
         )
         .origin(document.origin().immutable().clone())
-        .pipeline_id(Some(self.elem.global().pipeline_id()))
+        .pipeline_id(Some(self.element.global().pipeline_id()))
         .referrer_policy(referrer_policy)
         .integrity_metadata(integrity_metadata);
 
@@ -398,7 +399,7 @@ impl StylesheetLoader<'_> {
     }
 }
 
-impl StyleStylesheetLoader for StylesheetLoader<'_> {
+impl StyleStylesheetLoader for ElementStylesheetLoader<'_> {
     /// Request a stylesheet after parsing a given `@import` rule, and return
     /// the constructed `@import` rule.
     fn request_stylesheet(