style: Should not serialize default radius of circle.

Should not serialize default shape-outside circle() function radius.

The ToCss impl of Circle and Ellipse turn out to be identical in specified and computed value, thus move them to generics.

Differential Revision: https://phabricator.services.mozilla.com/D35183

components/style/values/computed/basic_shape.rs

@@ -10,8 +10,6 @@
 use crate::values::computed::url::ComputedUrl;
 use crate::values::computed::{Image, LengthPercentage, NonNegativeLengthPercentage};
 use crate::values::generics::basic_shape as generic;
-use std::fmt::{self, Write};
-use style_traits::{CssWriter, ToCss};
 
 /// A computed alias for FillRule.
 pub use crate::values::generics::basic_shape::FillRule;
@@ -42,34 +40,3 @@ pub type Ellipse =
 
 /// The computed value of `ShapeRadius`
 pub type ShapeRadius = generic::GenericShapeRadius<NonNegativeLengthPercentage>;
-
-impl ToCss for Circle {
-    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
-    where
-        W: Write,
-    {
-        dest.write_str("circle(")?;
-        self.radius.to_css(dest)?;
-        dest.write_str(" at ")?;
-        self.position.to_css(dest)?;
-        dest.write_str(")")
-    }
-}
-
-impl ToCss for Ellipse {
-    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
-    where
-        W: Write,
-    {
-        dest.write_str("ellipse(")?;
-        if (self.semiaxis_x, self.semiaxis_y) != Default::default() {
-            self.semiaxis_x.to_css(dest)?;
-            dest.write_str(" ")?;
-            self.semiaxis_y.to_css(dest)?;
-            dest.write_str(" ")?;
-        }
-        dest.write_str("at ")?;
-        self.position.to_css(dest)?;
-        dest.write_str(")")
-    }
-}

components/style/values/generics/basic_shape.rs

@@ -378,6 +378,48 @@ where
     }
 }
 
+impl<H, V, NonNegativeLengthPercentage> ToCss for Circle<H, V, NonNegativeLengthPercentage>
+where
+    GenericPosition<H, V>: ToCss,
+    NonNegativeLengthPercentage: ToCss + PartialEq,
+{
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        dest.write_str("circle(")?;
+        if self.radius != Default::default() {
+            self.radius.to_css(dest)?;
+            dest.write_str(" ")?;
+        }
+        dest.write_str("at ")?;
+        self.position.to_css(dest)?;
+        dest.write_str(")")
+    }
+}
+
+impl<H, V, NonNegativeLengthPercentage> ToCss for Ellipse<H, V, NonNegativeLengthPercentage>
+where
+    GenericPosition<H, V>: ToCss,
+    NonNegativeLengthPercentage: ToCss + PartialEq,
+{
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        dest.write_str("ellipse(")?;
+        if self.semiaxis_x != Default::default() || self.semiaxis_y != Default::default() {
+            self.semiaxis_x.to_css(dest)?;
+            dest.write_str(" ")?;
+            self.semiaxis_y.to_css(dest)?;
+            dest.write_str(" ")?;
+        }
+        dest.write_str("at ")?;
+        self.position.to_css(dest)?;
+        dest.write_str(")")
+    }
+}
+
 impl<L> Default for ShapeRadius<L> {
     #[inline]
     fn default() -> Self {

components/style/values/specified/basic_shape.rs

@@ -20,8 +20,7 @@ use crate::values::specified::SVGPathData;
 use crate::values::specified::{LengthPercentage, NonNegativeLengthPercentage};
 use crate::Zero;
 use cssparser::Parser;
-use std::fmt::{self, Write};
+use style_traits::{ParseError, StyleParseErrorKind};
-use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
 
 /// A specified alias for FillRule.
 pub use crate::values::generics::basic_shape::FillRule;
@@ -239,23 +238,6 @@ impl Circle {
     }
 }
 
-impl ToCss for Circle {
-    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
-    where
-        W: Write,
-    {
-        dest.write_str("circle(")?;
-        if generic::ShapeRadius::ClosestSide != self.radius {
-            self.radius.to_css(dest)?;
-            dest.write_str(" ")?;
-        }
-
-        dest.write_str("at ")?;
-        self.position.to_css(dest)?;
-        dest.write_str(")")
-    }
-}
-
 impl Parse for Ellipse {
     fn parse<'i, 't>(
         context: &ParserContext,
@@ -293,25 +275,6 @@ impl Ellipse {
     }
 }
 
-impl ToCss for Ellipse {
-    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
-    where
-        W: Write,
-    {
-        dest.write_str("ellipse(")?;
-        if self.semiaxis_x != ShapeRadius::default() || self.semiaxis_y != ShapeRadius::default() {
-            self.semiaxis_x.to_css(dest)?;
-            dest.write_str(" ")?;
-            self.semiaxis_y.to_css(dest)?;
-            dest.write_str(" ")?;
-        }
-
-        dest.write_str("at ")?;
-        self.position.to_css(dest)?;
-        dest.write_str(")")
-    }
-}
-
 impl Parse for ShapeRadius {
     fn parse<'i, 't>(
         context: &ParserContext,