Do not use borrowed types in the selectors::Element trait. #23463

RazrFalcon · 2019-05-26T16:18:23Z

This change allows implementing the selectors::Element trait for types that doesn't support borrowed types, like rc-tree.

./mach build -d does not report any errors
./mach test-tidy does not report any errors
These changes fix selectors::Element without borrowed types #22972

This change is

highfive · 2019-05-26T16:18:30Z

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @asajeffrey (or someone else) soon.

highfive · 2019-05-26T16:18:31Z

Heads up! This PR modifies the following files:

@emilio: components/style/dom_apis.rs, components/style/rule_collector.rs, components/style/selector_map.rs, components/style/bloom.rs, components/style/sharing/mod.rs and 2 more

highfive · 2019-05-26T16:18:33Z

Warning

These commits modify style code, but no tests are modified. Please consider adding a test!

RazrFalcon · 2019-05-26T16:19:06Z

components/selectors/tree.rs

@@ -58,10 +58,21 @@ pub trait Element: Sized + Clone + Debug {

    fn is_html_element_in_html_document(&self) -> bool;

-    fn local_name(&self) -> &<Self::Impl as SelectorImpl>::BorrowedLocalName;
+    fn local_name_hash(&self) -> u32;


This is ugly. I know. We need three methods instead of one now...

I think we don't need get_local_name or get_namespace, instead fn local_name and fn namespace should move to TElement (in components/style/dom.rs).

RazrFalcon · 2019-05-26T16:19:59Z

components/style/selector_map.rs

@@ -226,7 +226,7 @@ impl SelectorMap<Rule> {
            }
        });

-        if let Some(rules) = self.local_name_hash.get(rule_hash_target.local_name()) {
+        if let Some(rules) = self.local_name_hash.get(&rule_hash_target.get_local_name()) {


This method invokes clone() now. Which is bad. By I don't know how to fix it.

This doesn't need to use selectors::Element. You can move the fn local_name signature to TElement. So selectors doesn't need get_local_name, and this shouldn't need to call clone().

emilio

Thanks for the patch! Needs some changes, I think it can be simpler.

emilio · 2019-05-26T16:33:14Z

components/style/selector_map.rs

@@ -226,7 +226,7 @@ impl SelectorMap<Rule> {
            }
        });

-        if let Some(rules) = self.local_name_hash.get(rule_hash_target.local_name()) {
+        if let Some(rules) = self.local_name_hash.get(&rule_hash_target.get_local_name()) {


This doesn't need to use selectors::Element. You can move the fn local_name signature to TElement. So selectors doesn't need get_local_name, and this shouldn't need to call clone().

emilio · 2019-05-26T16:33:59Z

components/style/bloom.rs

-    f(element.local_name().get_hash());
-    f(element.namespace().get_hash());
+    f(element.local_name_hash());
+    f(element.namespace_hash());


Same, this doesn't need to use selectors::Element, and selectors doesn't need Element::namespace_hash.

emilio · 2019-05-26T16:35:00Z

components/selectors/tree.rs

@@ -58,10 +58,21 @@ pub trait Element: Sized + Clone + Debug {

    fn is_html_element_in_html_document(&self) -> bool;

-    fn local_name(&self) -> &<Self::Impl as SelectorImpl>::BorrowedLocalName;
+    fn local_name_hash(&self) -> u32;


I think we don't need get_local_name or get_namespace, instead fn local_name and fn namespace should move to TElement (in components/style/dom.rs).

emilio · 2019-05-26T16:37:57Z

components/style/invalidation/stylesheets.rs

@@ -90,8 +90,7 @@ impl Invalidation {
                // This could look at the quirks mode of the document, instead
                // of testing against both names, but it's probably not worth
                // it.
-                let local_name = element.local_name();
-                return *local_name == **name || *local_name == **lower_name;
+                return element.has_local_name(name) || element.has_local_name(lower_name);


Similarly this shouldn't need to change.

emilio · 2019-05-26T16:38:17Z

components/style/rule_collector.rs

@@ -42,7 +42,7 @@ pub fn containing_shadow_ignoring_svg_use<E: TElement>(
    loop {
        let host = shadow.host();
        let host_is_svg_use_element =
-            host.is_svg_element() && host.local_name() == &*local_name!("use");
+            host.is_svg_element() && host.has_local_name(&local_name!("use"));


these don't need to change, but may be nicer this way, your call.

emilio · 2019-05-26T16:39:03Z

components/style/sharing/mod.rs

-
-        if target.namespace() != candidate.element.namespace() {
-            trace!("Miss: Namespace");
+        if !target.is_same_type(&candidate.element) {


This doesn't need to change either, and I'd prefer to keep the two checks to remain separate to see why it fails.

RazrFalcon · 2019-05-26T16:59:58Z

components/style/invalidation/element/element_wrapper.rs

+        &self,
+        local_name: &<Self::Impl as ::selectors::SelectorImpl>::BorrowedLocalName,
+    ) -> bool {
+        self.element.has_local_name(local_name)


Not sure it this is correct.

Yes, this is right, local name / namespace don't change.

emilio · 2019-05-26T17:11:05Z

components/style/dom.rs

@@ -877,6 +877,12 @@ pub trait TElement:
        hints: &mut V,
    ) where
        V: Push<ApplicableDeclarationBlock>;
+
+    /// Returns element's local name.
+    fn local_name(&self) -> &LocalName;


This still needs to use the Borrowed* gunk, so that you don't break Firefox.

Also this actually needs to be implemented, right?

Not sure what exact type should be used?

Yes. It's used in the code.

Closes #22972

RazrFalcon · 2019-05-27T19:37:13Z

Finally, I was able to build it locally without any errors.

RazrFalcon · 2019-05-29T10:35:21Z

@emilio ?

emilio

Yeah, sorry for the lag.

This looks great, thanks! But I need to fix the Firefox implementation as well in servo/components/style/gecko/wrapper.rs.

So I'll land this after #23456 lands, if you don't mind.

Thanks again!

RazrFalcon · 2019-05-29T19:49:38Z

Thanks. No problem.

emilio · 2019-06-03T12:47:45Z

I'm cherry-picking this in the next sync

emilio · 2019-06-03T13:47:28Z

#23503 includes this commit along with the Firefox changes needed. Thanks a lot for the patch @RazrFalcon!

…it. r=emilio This cherry-picks servo/servo#23463 with a few fixes for the Gecko build.

Closes servo#22972 Closes servo#23463

…it. r=emilio This cherry-picks servo/servo#23463 with a few fixes for the Gecko build.

style: sync changes from mozilla-central See each individual commit for details. This also cherry-picks #23463 with a few fixes that were needed in Gecko-only code.  --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23503)

…it. r=emilio This cherry-picks servo/servo#23463 with a few fixes for the Gecko build. UltraBlame original commit: 53a5f4a6e1de21b62be288cac96763aeece78277

highfive assigned asajeffrey May 26, 2019

highfive added the S-awaiting-review There is new code that needs to be reviewed. label May 26, 2019

RazrFalcon commented May 26, 2019

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emilio requested changes May 26, 2019

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emilio reviewed May 26, 2019

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RazrFalcon commented May 26, 2019

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emilio reviewed May 26, 2019

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RazrFalcon mentioned this pull request May 27, 2019

selectors::Element without borrowed types #22972

Closed

Do not use borrowed types in the selectors::Element trait.

99b8fac

Closes #22972

emilio approved these changes May 29, 2019

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emilio mentioned this pull request Jun 3, 2019

style: sync changes from mozilla-central #23503

Merged

emilio closed this Jun 3, 2019

moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this pull request Jun 4, 2019

Bug 1556388 - Do not use borrowed types in the selectors::Element tra…

8e33a62

…it. r=emilio This cherry-picks servo/servo#23463 with a few fixes for the Gecko build.

emilio pushed a commit to emilio/servo that referenced this pull request Jun 4, 2019

style: Do not use borrowed types in the selectors::Element trait.

6f1df51

Closes servo#22972 Closes servo#23463

lissyx pushed a commit to lissyx/mozilla-central that referenced this pull request Jun 4, 2019

Bug 1556388 - Do not use borrowed types in the selectors::Element tra…

edacec0

…it. r=emilio This cherry-picks servo/servo#23463 with a few fixes for the Gecko build.

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Do not use borrowed types in the selectors::Element trait. #23463

Do not use borrowed types in the selectors::Element trait. #23463

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Do not use borrowed types in the selectors::Element trait. #23463

Do not use borrowed types in the selectors::Element trait. #23463

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