stylo: Implement Element.matches using stylo.

ports/geckolib/glue.rs

@@ -6,7 +6,7 @@ use cssparser::{Parser, ParserInput};
 use cssparser::ToCss as ParserToCss;
 use env_logger::LogBuilder;
 use malloc_size_of::MallocSizeOfOps;
-use selectors::Element;
+use selectors::{self, Element};
 use selectors::matching::{MatchingContext, MatchingMode, matches_selector};
 use servo_arc::{Arc, ArcBorrow, RawOffsetArc};
 use std::cell::RefCell;
@@ -122,7 +122,7 @@ use style::properties::animated_properties::compare_property_priority;
 use style::properties::parse_one_declaration_into;
 use style::rule_cache::RuleCacheConditions;
 use style::rule_tree::{CascadeLevel, StyleSource};
-use style::selector_parser::PseudoElementCascadeType;
+use style::selector_parser::{PseudoElementCascadeType, SelectorImpl};
 use style::shared_lock::{SharedRwLockReadGuard, StylesheetGuards, ToCssWithGuard, Locked};
 use style::string_cache::Atom;
 use style::style_adjuster::StyleAdjuster;
@@ -1522,6 +1522,22 @@ pub extern "C" fn Servo_StyleRule_SelectorMatchesElement(rule: RawServoStyleRule
     })
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn Servo_SelectorList_Matches(
+    element: RawGeckoElementBorrowed,
+    selectors: &::selectors::SelectorList<SelectorImpl>,
+) -> bool {
+    let element = GeckoElement(element);
+    let mut context = MatchingContext::new(
+        MatchingMode::Normal,
+        None,
+        None,
+        element.owner_document_quirks_mode(),
+    );
+
+    selectors::matching::matches_selector_list(selectors, &element, &mut context)
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_ImportRule_GetHref(rule: RawServoImportRuleBorrowed, result: *mut nsAString) {
     read_locked_arc(rule, |rule: &ImportRule| {
@@ -4102,3 +4118,25 @@ pub extern "C" fn Servo_CorruptRuleHashAndCrash(set: RawServoStyleSetBorrowed, i
     let per_doc_data = PerDocumentStyleData::from_ffi(set).borrow();
     per_doc_data.stylist.corrupt_rule_hash_and_crash(index);
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn Servo_SelectorList_Parse(
+    selector_list: *const nsACString,
+) -> *mut ::selectors::SelectorList<SelectorImpl> {
+    use style::selector_parser::SelectorParser;
+
+    debug_assert!(!selector_list.is_null());
+
+    let input = ::std::str::from_utf8_unchecked(&**selector_list);
+    let selector_list = match SelectorParser::parse_author_origin_no_namespace(&input) {
+        Ok(selector_list) => selector_list,
+        Err(..) => return ptr::null_mut(),
+    };
+
+    Box::into_raw(Box::new(selector_list))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Servo_SelectorList_Drop(list: *mut ::selectors::SelectorList<SelectorImpl>) {
+    let _ = Box::from_raw(list);
+}