style: Generalise BorderCornerRadius as Size.

components/style/values/computed/border.rs

@@ -7,11 +7,11 @@
 use values::animated::ToAnimatedZero;
 use values::computed::{Number, NumberOrPercentage};
 use values::computed::length::LengthOrPercentage;
-use values::generics::border::BorderCornerRadius as GenericBorderCornerRadius;
 use values::generics::border::BorderImageSideWidth as GenericBorderImageSideWidth;
 use values::generics::border::BorderImageSlice as GenericBorderImageSlice;
 use values::generics::border::BorderRadius as GenericBorderRadius;
 use values::generics::rect::Rect;
+use values::generics::size::Size;
 
 /// A computed value for the `border-image-width` property.
 pub type BorderImageWidth = Rect<BorderImageSideWidth>;
@@ -26,7 +26,7 @@ pub type BorderImageSlice = GenericBorderImageSlice<NumberOrPercentage>;
 pub type BorderRadius = GenericBorderRadius<LengthOrPercentage>;
 
 /// A computed value for the `border-*-radius` longhand properties.
-pub type BorderCornerRadius = GenericBorderCornerRadius<LengthOrPercentage>;
+pub type BorderCornerRadius = Size<LengthOrPercentage>;
 
 impl BorderImageSideWidth {
     /// Returns `1`.

components/style/values/generics/border.rs

@@ -4,10 +4,10 @@
 
 //! Generic types for CSS values related to borders.
 
-use euclid::Size2D;
 use std::fmt;
 use style_traits::ToCss;
 use values::generics::rect::Rect;
+use values::generics::size::Size;
 
 /// A generic value for a single side of a `border-image-width` property.
 #[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
@@ -42,22 +42,15 @@ pub struct BorderImageSlice<NumberOrPercentage> {
 #[derive(PartialEq, ToComputedValue)]
 pub struct BorderRadius<LengthOrPercentage> {
     /// The top left radius.
-    pub top_left: BorderCornerRadius<LengthOrPercentage>,
+    pub top_left: Size<LengthOrPercentage>,
     /// The top right radius.
-    pub top_right: BorderCornerRadius<LengthOrPercentage>,
+    pub top_right: Size<LengthOrPercentage>,
     /// The bottom right radius.
-    pub bottom_right: BorderCornerRadius<LengthOrPercentage>,
+    pub bottom_right: Size<LengthOrPercentage>,
     /// The bottom left radius.
-    pub bottom_left: BorderCornerRadius<LengthOrPercentage>,
+    pub bottom_left: Size<LengthOrPercentage>,
 }
 
-/// A generic value for `border-*-radius` longhand properties.
-#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
-#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
-#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug)]
-#[derive(PartialEq, ToComputedValue)]
-pub struct BorderCornerRadius<L>(pub Size2D<L>);
-
 impl<N> From<N> for BorderImageSlice<N>
     where N: Clone,
 {
@@ -87,11 +80,7 @@ impl<N> ToCss for BorderImageSlice<N>
 impl<L> BorderRadius<L> {
     /// Returns a new `BorderRadius<L>`.
     #[inline]
-    pub fn new(tl: BorderCornerRadius<L>,
-               tr: BorderCornerRadius<L>,
-               br: BorderCornerRadius<L>,
-               bl: BorderCornerRadius<L>)
-               -> Self {
+    pub fn new(tl: Size<L>, tr: Size<L>, br: Size<L>, bl: Size<L>) -> Self {
         BorderRadius {
             top_left: tl,
             top_right: tr,
@@ -135,34 +124,3 @@ impl<L> ToCss for BorderRadius<L>
         Self::serialize_rects(widths, heights, dest)
     }
 }
-
-impl<L> BorderCornerRadius<L> {
-    #[inline]
-    /// Create a new `BorderCornerRadius` for an area of given width and height.
-    pub fn new(width: L, height: L) -> BorderCornerRadius<L> {
-        BorderCornerRadius(Size2D::new(width, height))
-    }
-}
-
-impl<L: Clone> From<L> for BorderCornerRadius<L> {
-    fn from(radius: L) -> Self {
-        Self::new(radius.clone(), radius)
-    }
-}
-
-impl<L> ToCss for BorderCornerRadius<L>
-    where L: ToCss + PartialEq,
-{
-    fn to_css<W>(&self, dest: &mut W) -> fmt::Result
-        where W: fmt::Write
-    {
-        self.0.width.to_css(dest)?;
-
-        if self.0.height != self.0.width {
-            dest.write_str(" ")?;
-            self.0.height.to_css(dest)?;
-        }
-
-        Ok(())
-    }
-}

components/style/values/generics/mod.rs

@@ -25,6 +25,7 @@ pub mod grid;
 pub mod image;
 pub mod position;
 pub mod rect;
+pub mod size;
 pub mod svg;
 pub mod text;
 pub mod transform;

components/style/values/generics/size.rs

@@ -0,0 +1,103 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! Generic type for CSS properties that are composed by two dimensions.
+
+use cssparser::Parser;
+use euclid::Size2D;
+use parser::ParserContext;
+use std::fmt;
+use style_traits::{ToCss, ParseError};
+use values::animated::ToAnimatedValue;
+
+/// A generic size, for `border-*-radius` longhand properties, or
+/// `border-spacing`.
+#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
+#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
+#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug)]
+#[derive(PartialEq, ToComputedValue)]
+pub struct Size<L>(pub Size2D<L>);
+
+impl<L> Size<L> {
+    #[inline]
+    /// Create a new `Size` for an area of given width and height.
+    pub fn new(width: L, height: L) -> Size<L> {
+        Size(Size2D::new(width, height))
+    }
+
+    /// Returns the width component.
+    pub fn width(&self) -> &L {
+        &self.0.width
+    }
+
+    /// Returns the height component.
+    pub fn height(&self) -> &L {
+        &self.0.height
+    }
+
+    /// Parse a `Size` with a given parsing function.
+    pub fn parse_with<'i, 't, F>(
+        context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+        parse_one: F,
+    ) -> Result<Self, ParseError<'i>>
+    where
+        L: Clone,
+        F: Fn(&ParserContext, &mut Parser<'i, 't>) -> Result<L, ParseError<'i>>
+    {
+        let first = parse_one(context, input)?;
+        let second = input
+            .try(|i| parse_one(context, i))
+            .unwrap_or_else(|_| first.clone());
+        Ok(Self::new(first, second))
+    }
+}
+
+impl<L: Clone> From<L> for Size<L> {
+    fn from(size: L) -> Self {
+        Self::new(size.clone(), size)
+    }
+}
+
+impl<L> ToCss for Size<L>
+where L:
+    ToCss + PartialEq,
+{
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result
+    where W:
+        fmt::Write
+    {
+        self.0.width.to_css(dest)?;
+
+        if self.0.height != self.0.width {
+            dest.write_str(" ")?;
+            self.0.height.to_css(dest)?;
+        }
+
+        Ok(())
+    }
+}
+
+impl<L> ToAnimatedValue for Size<L>
+where L:
+    ToAnimatedValue,
+{
+    type AnimatedValue = Size<L::AnimatedValue>;
+
+    #[inline]
+    fn to_animated_value(self) -> Self::AnimatedValue {
+        Size(Size2D::new(
+            self.0.width.to_animated_value(),
+            self.0.height.to_animated_value(),
+        ))
+    }
+
+    #[inline]
+    fn from_animated_value(animated: Self::AnimatedValue) -> Self {
+        Size(Size2D::new(
+            L::from_animated_value(animated.0.width),
+            L::from_animated_value(animated.0.height),
+        ))
+    }
+}

components/style/values/specified/border.rs

@@ -8,7 +8,7 @@ use cssparser::Parser;
 use parser::{Parse, ParserContext};
 use style_traits::ParseError;
 use values::computed::{Context, NonNegativeLength, ToComputedValue};
-use values::generics::border::BorderCornerRadius as GenericBorderCornerRadius;
+use values::generics::size::Size;
 use values::generics::border::BorderImageSideWidth as GenericBorderImageSideWidth;
 use values::generics::border::BorderImageSlice as GenericBorderImageSlice;
 use values::generics::border::BorderRadius as GenericBorderRadius;
@@ -44,7 +44,7 @@ pub type BorderImageSlice = GenericBorderImageSlice<NumberOrPercentage>;
 pub type BorderRadius = GenericBorderRadius<LengthOrPercentage>;
 
 /// A specified value for the `border-*-radius` longhand properties.
-pub type BorderCornerRadius = GenericBorderCornerRadius<LengthOrPercentage>;
+pub type BorderCornerRadius = Size<LengthOrPercentage>;
 
 impl BorderSideWidth {
     /// Parses, with quirks.

tests/unit/style/parsing/border.rs

@@ -29,14 +29,14 @@ macro_rules! assert_border_radius_values {
         let input = parse(BorderRadius::parse, $input)
                           .expect(&format!("Failed parsing {} as border radius",
                                   $input));
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_left.0.width), $tlw);
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_right.0.width), $trw);
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_right.0.width), $brw);
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_left.0.width), $blw);
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_left.0.height), $tlh);
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_right.0.height), $trh);
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_right.0.height), $brh);
-        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_left.0.height), $blh);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_left.0.width()), $tlw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_right.0.width()), $trw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_right.0.width()), $brw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_left.0.width()), $blw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_left.0.height()), $tlh);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_right.0.height()), $trh);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_right.0.height()), $brh);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_left.0.height()), $blh);
     }
 }