Add stylo FFI for CSSStyleRule

components/style/binding_tools/regen.py

@@ -335,7 +335,8 @@
             "ServoComputedValues",
             "ServoCssRules",
             "RawServoStyleSheet",
-            "RawServoDeclarationBlock"
+            "RawServoDeclarationBlock",
+            "RawServoStyleRule",
         ],
         "servo_owned_types": [
             "RawServoStyleSet",

components/style/gecko/conversions.rs

@@ -11,13 +11,14 @@
 use app_units::Au;
 use gecko::values::{convert_rgba_to_nscolor, StyleCoordHelpers};
 use gecko_bindings::bindings::{Gecko_CreateGradient, Gecko_SetGradientImageValue, Gecko_SetUrlImageValue};
-use gecko_bindings::bindings::{RawServoStyleSheet, RawServoDeclarationBlock, ServoComputedValues, ServoCssRules};
+use gecko_bindings::bindings::{RawServoStyleSheet, RawServoDeclarationBlock, RawServoStyleRule};
+use gecko_bindings::bindings::{ServoComputedValues, ServoCssRules};
 use gecko_bindings::structs::{nsStyleCoord_CalcValue, nsStyleImage};
 use gecko_bindings::sugar::ns_style_coord::{CoordDataValue, CoordDataMut};
 use gecko_bindings::sugar::ownership::{HasArcFFI, HasFFI};
 use parking_lot::RwLock;
 use properties::{ComputedValues, PropertyDeclarationBlock};
-use stylesheets::{CssRule, Stylesheet};
+use stylesheets::{CssRule, Stylesheet, StyleRule};
 use values::computed::{CalcLengthOrPercentage, Gradient, Image, LengthOrPercentage, LengthOrPercentageOrAuto};
 
 unsafe impl HasFFI for Stylesheet {
@@ -39,6 +40,11 @@ unsafe impl HasFFI for RwLock<Vec<CssRule>> {
 }
 unsafe impl HasArcFFI for RwLock<Vec<CssRule>> {}
 
+unsafe impl HasFFI for RwLock<StyleRule> {
+    type FFIType = RawServoStyleRule;
+}
+unsafe impl HasArcFFI for RwLock<StyleRule> {}
+
 impl From<CalcLengthOrPercentage> for nsStyleCoord_CalcValue {
     fn from(other: CalcLengthOrPercentage) -> nsStyleCoord_CalcValue {
         let has_percentage = other.percentage.is_some();

components/style/gecko_bindings/bindings.rs

@@ -24,6 +24,11 @@ pub type RawServoDeclarationBlockBorrowedOrNull<'a> = Option<&'a RawServoDeclara
 pub type RawServoDeclarationBlockBorrowed<'a> = &'a RawServoDeclarationBlock;
 enum RawServoDeclarationBlockVoid{ }
 pub struct RawServoDeclarationBlock(RawServoDeclarationBlockVoid);
+pub type RawServoStyleRuleStrong = ::gecko_bindings::sugar::ownership::Strong<RawServoStyleRule>;
+pub type RawServoStyleRuleBorrowedOrNull<'a> = Option<&'a RawServoStyleRule>;
+pub type RawServoStyleRuleBorrowed<'a> = &'a RawServoStyleRule;
+enum RawServoStyleRuleVoid{ }
+pub struct RawServoStyleRule(RawServoStyleRuleVoid);
 pub type RawGeckoNodeBorrowed<'a> = &'a RawGeckoNode;
 pub type RawGeckoNodeBorrowedOrNull<'a> = Option<&'a RawGeckoNode>;
 pub type RawGeckoElementBorrowed<'a> = &'a RawGeckoElement;
@@ -220,6 +225,12 @@ extern "C" {
     pub fn Servo_DeclarationBlock_Release(ptr:
                                               RawServoDeclarationBlockBorrowed);
 }
+extern "C" {
+    pub fn Servo_StyleRule_AddRef(ptr: RawServoStyleRuleBorrowed);
+}
+extern "C" {
+    pub fn Servo_StyleRule_Release(ptr: RawServoStyleRuleBorrowed);
+}
 extern "C" {
     pub fn Servo_StyleSet_Drop(ptr: RawServoStyleSetOwned);
 }
@@ -994,6 +1005,11 @@ extern "C" {
     pub fn Servo_CssRules_ListTypes(rules: ServoCssRulesBorrowed,
                                     result: nsTArrayBorrowed_uintptr_t);
 }
+extern "C" {
+    pub fn Servo_CssRules_GetStyleRuleAt(rules: ServoCssRulesBorrowed,
+                                         index: u32)
+     -> RawServoStyleRuleStrong;
+}
 extern "C" {
     pub fn Servo_ParseProperty(property: *const nsACString_internal,
                                value: *const nsACString_internal,

ports/geckolib/glue.rs

@@ -23,6 +23,7 @@ use style::gecko::wrapper::{GeckoElement, GeckoNode};
 use style::gecko::wrapper::DUMMY_BASE_URL;
 use style::gecko_bindings::bindings::{RawGeckoElementBorrowed, RawGeckoNodeBorrowed};
 use style::gecko_bindings::bindings::{RawServoDeclarationBlockBorrowed, RawServoDeclarationBlockStrong};
+use style::gecko_bindings::bindings::{RawServoStyleRuleBorrowed, RawServoStyleRuleStrong};
 use style::gecko_bindings::bindings::{RawServoStyleSetBorrowed, RawServoStyleSetOwned};
 use style::gecko_bindings::bindings::{RawServoStyleSheetBorrowed, ServoComputedValuesBorrowed};
 use style::gecko_bindings::bindings::{RawServoStyleSheetStrong, ServoComputedValuesStrong};
@@ -47,7 +48,7 @@ use style::properties::{apply_declarations, parse_one_declaration};
 use style::selector_parser::PseudoElementCascadeType;
 use style::sequential;
 use style::string_cache::Atom;
-use style::stylesheets::{CssRule, Origin, Stylesheet};
+use style::stylesheets::{CssRule, Origin, Stylesheet, StyleRule};
 use style::thread_state;
 use style::timer::Timer;
 use style_traits::ToCss;
@@ -290,6 +291,18 @@ pub extern "C" fn Servo_CssRules_ListTypes(rules: ServoCssRulesBorrowed,
     result.iter_mut().zip(iter).fold((), |_, (r, v)| *r = v);
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_CssRules_GetStyleRuleAt(rules: ServoCssRulesBorrowed, index: u32)
+                                                -> RawServoStyleRuleStrong {
+    let rules = RwLock::<Vec<CssRule>>::as_arc(&rules).read();
+    match rules[index as usize] {
+        CssRule::Style(ref rule) => rule.clone().into_strong(),
+        _ => {
+            unreachable!("GetStyleRuleAt should only be called on a style rule");
+        }
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_CssRules_AddRef(rules: ServoCssRulesBorrowed) -> () {
     unsafe { RwLock::<Vec<CssRule>>::addref(rules) };
@@ -300,6 +313,16 @@ pub extern "C" fn Servo_CssRules_Release(rules: ServoCssRulesBorrowed) -> () {
     unsafe { RwLock::<Vec<CssRule>>::release(rules) };
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_StyleRule_AddRef(rule: RawServoStyleRuleBorrowed) -> () {
+    unsafe { RwLock::<StyleRule>::addref(rule) };
+}
+
+#[no_mangle]
+pub extern "C" fn Servo_StyleRule_Release(rule: RawServoStyleRuleBorrowed) -> () {
+    unsafe { RwLock::<StyleRule>::release(rule) };
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_ComputedValues_Get(node: RawGeckoNodeBorrowed)
      -> ServoComputedValuesStrong {