Add basic CSSOM support for @import rule.

components/style/stylesheets.rs

@@ -633,6 +633,9 @@ pub struct ImportRule {
     /// It contains an empty list of rules and namespace set that is updated
     /// when it loads.
     pub stylesheet: Arc<Stylesheet>,
+
+    /// The line and column of the rule's source code.
+    pub source_location: SourceLocation,
 }
 
 impl Clone for ImportRule {
@@ -641,6 +644,7 @@ impl Clone for ImportRule {
         ImportRule {
             url: self.url.clone(),
             stylesheet: Arc::new(stylesheet.clone()),
+            source_location: self.source_location.clone(),
         }
     }
 }
@@ -1530,6 +1534,8 @@ impl<'a> AtRuleParser for TopLevelRuleParser<'a> {
 
     fn parse_prelude(&mut self, name: &str, input: &mut Parser)
                      -> Result<AtRuleType<AtRulePrelude, CssRule>, ()> {
+        let location = get_location_with_offset(input.current_source_location(),
+                                                self.context.line_number_offset);
         match_ignore_ascii_case! { name,
             "import" => {
                 if self.state.get() <= State::Imports {
@@ -1561,7 +1567,8 @@ impl<'a> AtRuleParser for TopLevelRuleParser<'a> {
                                 dirty_on_viewport_size_change: AtomicBool::new(false),
                                 disabled: AtomicBool::new(false),
                                 quirks_mode: self.context.quirks_mode,
-                            })
+                            }),
+                            source_location: location,
                         }
                     }, &mut |import_rule| {
                         Arc::new(self.shared_lock.wrap(import_rule))
@@ -1576,9 +1583,6 @@ impl<'a> AtRuleParser for TopLevelRuleParser<'a> {
                 if self.state.get() <= State::Namespaces {
                     self.state.set(State::Namespaces);
 
-                    let location = get_location_with_offset(input.current_source_location(),
-                                                            self.context.line_number_offset);
-
                     let prefix_result = input.try(|input| input.expect_ident());
                     let url = Namespace::from(try!(input.expect_url_or_string()));
 

ports/geckolib/glue.rs

@@ -30,6 +30,7 @@ use style::gecko_bindings::bindings::{RawGeckoElementBorrowed, RawGeckoElementBo
 use style::gecko_bindings::bindings::{RawGeckoKeyframeListBorrowed, RawGeckoKeyframeListBorrowedMut};
 use style::gecko_bindings::bindings::{RawServoDeclarationBlockBorrowed, RawServoDeclarationBlockStrong};
 use style::gecko_bindings::bindings::{RawServoDocumentRule, RawServoDocumentRuleBorrowed};
+use style::gecko_bindings::bindings::{RawServoImportRule, RawServoImportRuleBorrowed};
 use style::gecko_bindings::bindings::{RawServoKeyframe, RawServoKeyframeBorrowed, RawServoKeyframeStrong};
 use style::gecko_bindings::bindings::{RawServoKeyframesRule, RawServoKeyframesRuleBorrowed};
 use style::gecko_bindings::bindings::{RawServoMediaList, RawServoMediaListBorrowed, RawServoMediaListStrong};
@@ -56,7 +57,6 @@ use style::gecko_bindings::bindings::RawGeckoServoStyleRuleListBorrowedMut;
 use style::gecko_bindings::bindings::RawServoAnimationValueBorrowed;
 use style::gecko_bindings::bindings::RawServoAnimationValueMapBorrowedMut;
 use style::gecko_bindings::bindings::RawServoAnimationValueStrong;
-use style::gecko_bindings::bindings::RawServoImportRuleBorrowed;
 use style::gecko_bindings::bindings::RawServoStyleRuleBorrowed;
 use style::gecko_bindings::bindings::ServoComputedValuesBorrowedOrNull;
 use style::gecko_bindings::bindings::nsTArrayBorrowed_uintptr_t;
@@ -988,6 +988,12 @@ impl_basic_rule_funcs! { (Style, StyleRule, RawServoStyleRule),
     to_css: Servo_StyleRule_GetCssText,
 }
 
+impl_basic_rule_funcs! { (Import, ImportRule, RawServoImportRule),
+    getter: Servo_CssRules_GetImportRuleAt,
+    debug: Servo_ImportRule_Debug,
+    to_css: Servo_ImportRule_GetCssText,
+}
+
 impl_basic_rule_funcs_without_getter! { (Keyframe, RawServoKeyframe),
     debug: Servo_Keyframe_Debug,
     to_css: Servo_Keyframe_GetCssText,
@@ -1077,6 +1083,13 @@ pub extern "C" fn Servo_StyleRule_GetSelectorText(rule: RawServoStyleRuleBorrowe
     })
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_ImportRule_GetHref(rule: RawServoImportRuleBorrowed, result: *mut nsAString) {
+    read_locked_arc(rule, |rule: &ImportRule| {
+        write!(unsafe { &mut *result }, "{}", rule.url.as_str()).unwrap();
+    })
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_Keyframe_GetKeyText(keyframe: RawServoKeyframeBorrowed, result: *mut nsAString) {
     read_locked_arc(keyframe, |keyframe: &Keyframe| {