style: Use more CascadeData and less Stylist for XBL stuff.

Just some more uses of Stylist in XBL that can be converted right away.

I'm trying to make XBL not use a Stylist, slowly...

components/style/dom.rs

@@ -31,7 +31,7 @@ use std::fmt;
 use std::fmt::Debug;
 use std::hash::Hash;
 use std::ops::Deref;
-use stylist::{CascadeData, Stylist};
+use stylist::CascadeData;
 use traversal_flags::TraversalFlags;
 
 /// An opaque handle to a node, which, unlike UnsafeNode, cannot be transformed
@@ -751,10 +751,10 @@ pub trait TElement
     /// Implements Gecko's `nsBindingManager::WalkRules`.
     ///
     /// Returns whether to cut off the inheritance.
-    fn each_xbl_stylist<'a, F>(&self, _: F) -> bool
+    fn each_xbl_cascade_data<'a, F>(&self, _: F) -> bool
     where
         Self: 'a,
-        F: FnMut(AtomicRef<'a, Stylist>),
+        F: FnMut(AtomicRef<'a, CascadeData>, QuirksMode),
     {
         false
     }
@@ -768,24 +768,11 @@ pub trait TElement
         Self: 'a,
         F: FnMut(AtomicRef<'a, CascadeData>, QuirksMode),
     {
-        let cut_off_inheritance = self.each_xbl_stylist(|stylist| {
+        let cut_off_inheritance = self.each_xbl_cascade_data(&mut f);
-            let quirks_mode = stylist.quirks_mode();
-            f(
-                AtomicRef::map(stylist, |stylist| stylist.author_cascade_data()),
-                quirks_mode,
-            )
-        });
 
         let mut current = self.assigned_slot();
         while let Some(slot) = current {
-            slot.each_xbl_stylist(|stylist| {
+            slot.each_xbl_cascade_data(&mut f);
-                let quirks_mode = stylist.quirks_mode();
-                f(
-                    AtomicRef::map(stylist, |stylist| stylist.author_cascade_data()),
-                    quirks_mode,
-                )
-            });
-
             current = slot.assigned_slot();
         }
 
@@ -794,8 +781,9 @@ pub trait TElement
 
     /// Gets the current existing CSS transitions, by |property, end value| pairs in a FnvHashMap.
     #[cfg(feature = "gecko")]
-    fn get_css_transitions_info(&self)
+    fn get_css_transitions_info(
-                                -> FnvHashMap<LonghandId, Arc<AnimationValue>>;
+        &self,
+    ) -> FnvHashMap<LonghandId, Arc<AnimationValue>>;
 
     /// Does a rough (and cheap) check for whether or not transitions might need to be updated that
     /// will quickly return false for the common case of no transitions specified or running. If

components/style/gecko/wrapper.rs

@@ -86,7 +86,7 @@ use std::mem;
 use std::ops::DerefMut;
 use std::ptr;
 use string_cache::{Atom, Namespace, WeakAtom, WeakNamespace};
-use stylist::Stylist;
+use stylist::CascadeData;
 
 /// A simple wrapper over `nsIDocument`.
 #[derive(Clone, Copy)]
@@ -429,12 +429,12 @@ impl<'lb> GeckoXBLBinding<'lb> {
         }
     }
 
-    fn each_xbl_stylist<F>(&self, f: &mut F)
+    fn each_xbl_cascade_data<F>(&self, f: &mut F)
     where
-        F: FnMut(AtomicRef<'lb, Stylist>),
+        F: FnMut(AtomicRef<'lb, CascadeData>, QuirksMode),
     {
         if let Some(base) = self.base_binding() {
-            base.each_xbl_stylist(f);
+            base.each_xbl_cascade_data(f);
         }
 
         let raw_data = unsafe {
@@ -443,7 +443,8 @@ impl<'lb> GeckoXBLBinding<'lb> {
 
         if let Some(raw_data) = raw_data {
             let data = PerDocumentStyleData::from_ffi(&*raw_data).borrow();
-            f(AtomicRef::map(data, |d| &d.stylist));
+            let quirks_mode = data.stylist.quirks_mode();
+            f(AtomicRef::map(data, |d| d.stylist.author_cascade_data()), quirks_mode);
         }
     }
 }
@@ -1374,10 +1375,10 @@ impl<'le> TElement for GeckoElement<'le> {
         self.may_have_animations() && unsafe { Gecko_ElementHasCSSTransitions(self.0) }
     }
 
-    fn each_xbl_stylist<'a, F>(&self, mut f: F) -> bool
+    fn each_xbl_cascade_data<'a, F>(&self, mut f: F) -> bool
     where
         'le: 'a,
-        F: FnMut(AtomicRef<'a, Stylist>),
+        F: FnMut(AtomicRef<'a, CascadeData>, QuirksMode),
     {
         // Walk the binding scope chain, starting with the binding attached to
         // our content, up till we run out of scopes or we get cut off.
@@ -1388,7 +1389,7 @@ impl<'le> TElement for GeckoElement<'le> {
 
         while let Some(element) = current {
             if let Some(binding) = element.get_xbl_binding() {
-                binding.each_xbl_stylist(&mut f);
+                binding.each_xbl_cascade_data(&mut f);
 
                 // If we're not looking at our original element, allow the
                 // binding to cut off style inheritance.
@@ -1416,8 +1417,7 @@ impl<'le> TElement for GeckoElement<'le> {
 
     fn xbl_binding_anonymous_content(&self) -> Option<GeckoNode<'le>> {
         self.get_xbl_binding_with_content()
-            .map(|b| unsafe { b.anon_content().as_ref() }.unwrap())
+            .map(|b| unsafe { GeckoNode::from_content(&*b.anon_content()) })
-            .map(GeckoNode::from_content)
     }
 
     fn get_css_transitions_info(

components/style/stylist.rs

@@ -1268,8 +1268,8 @@ impl Stylist {
             }
 
             for slot in slots.iter().rev() {
-                slot.each_xbl_stylist(|stylist| {
+                slot.each_xbl_cascade_data(|cascade_data, _quirks_mode| {
-                    if let Some(map) = stylist.cascade_data.author.slotted_rules(pseudo_element) {
+                    if let Some(map) = cascade_data.slotted_rules(pseudo_element) {
                         map.get_all_matching_rules(
                             element,
                             rule_hash_target,
@@ -1287,8 +1287,8 @@ impl Stylist {
         // even for getDefaultComputedStyle!
         //
         // Also, this doesn't account for the author_styles_enabled stuff.
-        let cut_off_inheritance = element.each_xbl_stylist(|stylist| {
+        let cut_off_inheritance = element.each_xbl_cascade_data(|cascade_data, quirks_mode| {
-            if let Some(map) = stylist.cascade_data.author.normal_rules(pseudo_element) {
+            if let Some(map) = cascade_data.normal_rules(pseudo_element) {
                 // NOTE(emilio): This is needed because the XBL stylist may
                 // think it has a different quirks mode than the document.
                 //
@@ -1299,7 +1299,7 @@ impl Stylist {
                     context.matching_mode(),
                     context.bloom_filter,
                     context.nth_index_cache.as_mut().map(|s| &mut **s),
-                    stylist.quirks_mode,
+                    quirks_mode,
                 );
                 matching_context.pseudo_element_matching_fn = context.pseudo_element_matching_fn;