style: Move border-image-repeat outside of mako.

components/style/values/computed/border.rs

@@ -5,8 +5,10 @@
 //! Computed types for CSS values related to borders.
 
 use app_units::Au;
+use std::fmt::{self, Write};
+use style_traits::{ToCss, CssWriter};
 use values::animated::ToAnimatedZero;
-use values::computed::{Number, NumberOrPercentage};
+use values::computed::{Context, Number, NumberOrPercentage, ToComputedValue};
 use values::computed::length::{LengthOrPercentage, NonNegativeLength};
 use values::generics::border::BorderCornerRadius as GenericBorderCornerRadius;
 use values::generics::border::BorderImageSideWidth as GenericBorderImageSideWidth;
@@ -15,6 +17,7 @@ use values::generics::border::BorderRadius as GenericBorderRadius;
 use values::generics::border::BorderSpacing as GenericBorderSpacing;
 use values::generics::rect::Rect;
 use values::generics::size::Size;
+use values::specified::border::{BorderImageRepeat as SpecifiedBorderImageRepeat, RepeatKeyword};
 
 /// A computed value for the `border-image-width` property.
 pub type BorderImageWidth = Rect<BorderImageSideWidth>;
@@ -81,3 +84,44 @@ impl ToAnimatedZero for BorderCornerRadius {
         Err(())
     }
 }
+
+/// The computed value of the `border-image-repeat` property:
+///
+/// https://drafts.csswg.org/css-backgrounds/#the-border-image-repeat
+#[derive(Clone, Debug, MallocSizeOf, PartialEq)]
+pub struct BorderImageRepeat(pub RepeatKeyword, pub RepeatKeyword);
+
+impl BorderImageRepeat {
+    /// Returns the `stretch` value.
+    pub fn stretch() -> Self {
+        BorderImageRepeat(RepeatKeyword::Stretch, RepeatKeyword::Stretch)
+    }
+}
+
+impl ToCss for BorderImageRepeat {
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        self.0.to_css(dest)?;
+        if self.0 != self.1 {
+            dest.write_str(" ")?;
+            self.1.to_css(dest)?;
+        }
+        Ok(())
+    }
+}
+
+impl ToComputedValue for SpecifiedBorderImageRepeat {
+    type ComputedValue = BorderImageRepeat;
+
+    #[inline]
+    fn to_computed_value(&self, _: &Context) -> Self::ComputedValue {
+        BorderImageRepeat(self.0, self.1.unwrap_or(self.0))
+    }
+
+    #[inline]
+    fn from_computed_value(computed: &Self::ComputedValue) -> Self {
+        SpecifiedBorderImageRepeat(computed.0, Some(computed.1))
+    }
+}