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Refactor style to be completely backend-independent

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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
This commit is contained in:
Emilio Cobos Álvarez 2016-02-08 02:53:22 +01:00
parent a164176876
commit dd503dfacb
41 changed files with 767 additions and 310 deletions
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14
components/style/context.rs
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@ -8,19 +8,20 @@ use dom::OpaqueNode;
use error_reporting::ParseErrorReporter;
use euclid::Size2D;
use matching::{ApplicableDeclarationsCache, StyleSharingCandidateCache};
use selector_impl::SelectorImplExt;
use selector_matching::Stylist;
use std::cell::RefCell;
use std::collections::HashMap;
use std::sync::mpsc::Sender;
use std::sync::{Arc, Mutex, RwLock};
pub struct StylistWrapper(pub *const Stylist);
pub struct StylistWrapper<Impl: SelectorImplExt>(pub *const Stylist<Impl>);
// FIXME(#6569) This implementation is unsound.
#[allow(unsafe_code)]
unsafe impl Sync for StylistWrapper {}
unsafe impl<Impl: SelectorImplExt> Sync for StylistWrapper<Impl> {}
pub struct SharedStyleContext {
pub struct SharedStyleContext<Impl: SelectorImplExt> {
/// The current viewport size.
pub viewport_size: Size2D<Au>,
@ -30,7 +31,7 @@ pub struct SharedStyleContext {
/// The CSS selector stylist.
///
/// FIXME(#2604): Make this no longer an unsafe pointer once we have fast `RWArc`s.
pub stylist: StylistWrapper,
pub stylist: StylistWrapper<Impl>,
/// Starts at zero, and increased by one every time a layout completes.
/// This can be used to easily check for invalid stale data.
@ -58,8 +59,9 @@ pub struct LocalStyleContext {
pub style_sharing_candidate_cache: RefCell<StyleSharingCandidateCache>,
}
pub trait StyleContext<'a> {
fn shared_context(&self) -> &'a SharedStyleContext;
pub trait StyleContext<'a, Impl: SelectorImplExt> {
fn shared_context(&self) -> &'a SharedStyleContext<Impl>;
fn local_context(&self) -> &LocalStyleContext;
}