Implement CSSStyleSheet::replaceSync (#36586)

Implements the `replaceSync` method on CSSStyleSheet

Testing: Covered by wpt tests. Expectations are updated.

Signed-off-by: webbeef <me@webbeef.org>

3 files changed, 36 insertions, 1 deletions

diff --git a/components/script/dom/bindings/error.rs b/components/script/dom/bindings/error.rs
index b0fd301df6a..f5bd03cd8d7 100644
--- a/components/script/dom/bindings/error.rs
+++ b/components/script/dom/bindings/error.rs
@@ -93,6 +93,7 @@ pub(crate) fn throw_dom_exception(
         Error::NotReadable => DOMErrorName::NotReadableError,
         Error::Data => DOMErrorName::DataError,
         Error::Operation => DOMErrorName::OperationError,
+        Error::NotAllowed => DOMErrorName::NotAllowedError,
         Error::Type(message) => unsafe {
             assert!(!JS_IsExceptionPending(*cx));
             throw_type_error(*cx, &message);
diff --git a/components/script/dom/cssstylesheet.rs b/components/script/dom/cssstylesheet.rs
index 421e8f45523..a367c9943de 100644
--- a/components/script/dom/cssstylesheet.rs
+++ b/components/script/dom/cssstylesheet.rs
@@ -24,7 +24,7 @@ use crate::dom::bindings::reflector::{
     DomGlobal, reflect_dom_object, reflect_dom_object_with_proto,
 };
 use crate::dom::bindings::root::{DomRoot, MutNullableDom};
-use crate::dom::bindings::str::DOMString;
+use crate::dom::bindings::str::{DOMString, USVString};
 use crate::dom::cssrulelist::{CSSRuleList, RulesSource};
 use crate::dom::element::Element;
 use crate::dom::medialist::MediaList;
@@ -290,4 +290,32 @@ impl CSSStyleSheetMethods<crate::DomTypeHolder> for CSSStyleSheet {
         // > 8. Return -1.
         Ok(-1)
     }
+
+    /// <https://drafts.csswg.org/cssom/#synchronously-replace-the-rules-of-a-cssstylesheet>
+    fn ReplaceSync(&self, text: USVString) -> Result<(), Error> {
+        // Step 1. If the constructed flag is not set throw a NotAllowedError
+        if !self.is_constructed {
+            return Err(Error::NotAllowed);
+        }
+
+        // Step 2. Let rules be the result of running parse a stylesheet’s contents from text.
+        let global = self.global();
+        let window = global.as_window();
+
+        StyleStyleSheet::update_from_str(
+            &self.style_stylesheet,
+            &text,
+            UrlExtraData(window.get_url().get_arc()),
+            None,
+            window.css_error_reporter(),
+            AllowImportRules::No, // Step 3.If rules contains one or more @import rules, remove those rules from rules.
+        );
+
+        // Step 4. Set sheet’s CSS rules to rules.
+        // We reset our rule list, which will be initialized properly
+        // at the next getter access.
+        self.rulelist.set(None);
+
+        Ok(())
+    }
 }
diff --git a/components/script/dom/domexception.rs b/components/script/dom/domexception.rs
index 15c0a717fd3..fbb807b7a95 100644
--- a/components/script/dom/domexception.rs
+++ b/components/script/dom/domexception.rs
@@ -53,6 +53,7 @@ pub(crate) enum DOMErrorName {
     NotReadableError,
     DataError,
     OperationError,
+    NotAllowedError,
 }
 
 impl DOMErrorName {
@@ -84,6 +85,7 @@ impl DOMErrorName {
             "NotReadableError" => Some(DOMErrorName::NotReadableError),
             "DataError" => Some(DOMErrorName::DataError),
             "OperationError" => Some(DOMErrorName::OperationError),
+            "NotAllowedError" => Some(DOMErrorName::NotAllowedError),
             _ => None,
         }
     }
@@ -135,6 +137,10 @@ impl DOMException {
             DOMErrorName::OperationError => {
                 "The operation failed for an operation-specific reason."
             },
+            DOMErrorName::NotAllowedError => {
+                r#"The request is not allowed by the user agent or the platform in the current context,
+                possibly because the user denied permission."#
+            },
         };
 
         (