Refactor style to be completely backend-independent

This commit refactors the style crate to be completely independent of
the actual implementation and pseudo-elements supported.

This also adds a gecko backend which introduces parsing for the
anonymous box pseudo-elements[1], although there's still no way of
querying them.

https://mxr.mozilla.org/mozilla-central/source/layout/style/nsCSSAnonBoxList.h

1 files changed, 6 insertions, 4 deletions

diff --git a/components/layout/layout_thread.rs b/components/layout/layout_thread.rs
index aaa6a1e98c0..a540039c51b 100644
--- a/components/layout/layout_thread.rs
+++ b/components/layout/layout_thread.rs
@@ -62,13 +62,15 @@ use std::sync::mpsc::{channel, Sender, Receiver};
 use std::sync::{Arc, Mutex, MutexGuard, RwLock};
 use style::animation::Animation;
 use style::computed_values::{filter, mix_blend_mode};
-use style::context::{SharedStyleContext, StylistWrapper, ReflowGoal};
+use style::context::{ReflowGoal, StylistWrapper};
 use style::dom::{TDocument, TElement, TNode};
 use style::error_reporting::ParseErrorReporter;
 use style::media_queries::{Device, MediaType};
 use style::parallel::WorkQueueData;
-use style::selector_matching::{Stylist, USER_OR_USER_AGENT_STYLESHEETS};
-use style::stylesheets::{CSSRuleIteratorExt, Stylesheet};
+use style::selector_impl::ServoSelectorImpl;
+use style::selector_matching::USER_OR_USER_AGENT_STYLESHEETS;
+use style::servo::{SharedStyleContext, Stylesheet, Stylist};
+use style::stylesheets::CSSRuleIteratorExt;
 use traversal::RecalcStyleAndConstructFlows;
 use url::Url;
 use util::geometry::MAX_RECT;
@@ -477,7 +479,7 @@ impl LayoutThread {
             style_context: SharedStyleContext {
                 viewport_size: self.viewport_size.clone(),
                 screen_size_changed: screen_size_changed,
-                stylist: StylistWrapper(&*rw_data.stylist),
+                stylist: StylistWrapper::<ServoSelectorImpl>(&*rw_data.stylist),
                 generation: self.generation,
                 goal: goal,
                 new_animations_sender: Mutex::new(self.new_animations_sender.clone()),