Cleanup Polygon and make it generic

components/style/gecko/conversions.rs

@@ -329,6 +329,7 @@ pub mod basic_shape {
     use values::computed::basic_shape::*;
     use values::computed::position;
     use values::generics::BorderRadiusSize as GenericBorderRadiusSize;
+    use values::generics::basic_shape::FillRule;
 
     // using Borrow so that we can have a non-moving .into()
     impl<T: Borrow<StyleBasicShape>> From<T> for BasicShape {

components/style/values/computed/basic_shape.rs

@@ -12,9 +12,11 @@ use style_traits::ToCss;
 use values::computed::LengthOrPercentage;
 use values::computed::position::Position;
 use values::generics::basic_shape::{BorderRadius as GenericBorderRadius, ShapeRadius as GenericShapeRadius};
+use values::generics::basic_shape::Polygon as GenericPolygon;
 use values::specified::url::SpecifiedUrl;
 
-pub use values::specified::basic_shape::{self, FillRule, GeometryBox, ShapeBox};
+pub use values::generics::basic_shape::FillRule;
+pub use values::specified::basic_shape::{self, GeometryBox, ShapeBox};
 
 #[derive(Clone, PartialEq, Debug)]
 #[cfg_attr(feature = "servo", derive(HeapSizeOf))]
@@ -141,35 +143,8 @@ impl ToCss for Ellipse {
     }
 }
 
-#[derive(Clone, PartialEq, Debug)]
-#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
-#[allow(missing_docs)]
-/// https://drafts.csswg.org/css-shapes/#funcdef-polygon
-pub struct Polygon {
-    pub fill: FillRule,
-    pub coordinates: Vec<(LengthOrPercentage, LengthOrPercentage)>,
-}
-
-impl ToCss for Polygon {
-    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-        try!(dest.write_str("polygon("));
-        let mut need_space = false;
-        if self.fill != Default::default() {
-            try!(self.fill.to_css(dest));
-            try!(dest.write_str(", "));
-        }
-        for coord in &self.coordinates {
-            if need_space {
-                try!(dest.write_str(", "));
-            }
-            try!(coord.0.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(coord.1.to_css(dest));
-            need_space = true;
-        }
-        dest.write_str(")")
-    }
-}
+/// The computed value of `Polygon`
+pub type Polygon = GenericPolygon<LengthOrPercentage>;
 
 /// The computed value of `BorderRadius`
 pub type BorderRadius = GenericBorderRadius<LengthOrPercentage>;

components/style/values/generics/basic_shape.rs

@@ -5,11 +5,14 @@
 //! CSS handling for the [`basic-shape`](https://drafts.csswg.org/css-shapes/#typedef-basic-shape)
 //! types that are generic over their `ToCss` implementations.
 
+use cssparser::Parser;
 use euclid::size::Size2D;
+use parser::{Parse, ParserContext};
 use properties::shorthands::serialize_four_sides;
+use std::ascii::AsciiExt;
 use std::fmt;
 use style_traits::ToCss;
-use values::computed::{Context, ToComputedValue};
+use values::computed::{ComputedValueAsSpecified, Context, ToComputedValue};
 use values::generics::BorderRadiusSize;
 
 /// A generic type used for `border-radius`, `outline-radius` and `inset()` values.
@@ -126,3 +129,108 @@ impl<L: ToComputedValue> ToComputedValue for ShapeRadius<L> {
         }
     }
 }
+
+// https://drafts.csswg.org/css-shapes/#typedef-fill-rule
+// NOTE: Basic shapes spec says that these are the only two values, however
+// https://www.w3.org/TR/SVG/painting.html#FillRuleProperty
+// says that it can also be `inherit`
+define_css_keyword_enum!(FillRule:
+    "nonzero" => NonZero,
+    "evenodd" => EvenOdd
+);
+
+impl ComputedValueAsSpecified for FillRule {}
+
+impl Default for FillRule {
+    #[inline]
+    fn default() -> Self { FillRule::NonZero }
+}
+
+#[derive(Clone, PartialEq, Debug)]
+#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
+/// A generic type for representing the `polygon()` function
+///
+/// https://drafts.csswg.org/css-shapes/#funcdef-polygon
+pub struct Polygon<L> {
+    /// The filling rule for a polygon.
+    pub fill: FillRule,
+    /// A collection of (x, y) coordinates to draw the polygon.
+    pub coordinates: Vec<(L, L)>,
+}
+
+impl<L: Parse> Polygon<L> {
+    /// Parse the inner arguments of a `polygon` function.
+    pub fn parse_function_arguments(context: &ParserContext, input: &mut Parser) -> Result<Self, ()> {
+        let fill = input.try(|i| -> Result<_, ()> {
+            let fill = FillRule::parse(i)?;
+            i.expect_comma()?;      // only eat the comma if there is something before it
+            Ok(fill)
+        }).ok().unwrap_or_default();
+
+        let buf = input.parse_comma_separated(|i| {
+            Ok((L::parse(context, i)?, L::parse(context, i)?))
+        })?;
+
+        Ok(Polygon {
+            fill: fill,
+            coordinates: buf,
+        })
+    }
+}
+
+impl<L: Parse> Parse for Polygon<L> {
+    fn parse(context: &ParserContext, input: &mut Parser) -> Result<Self, ()> {
+        match input.expect_function() {
+            Ok(ref s) if s.eq_ignore_ascii_case("polygon") =>
+                input.parse_nested_block(|i| Polygon::parse_function_arguments(context, i)),
+            _ => Err(())
+        }
+    }
+}
+
+impl<L: ToCss> ToCss for Polygon<L> {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        dest.write_str("polygon(")?;
+        if self.fill != FillRule::default() {
+            self.fill.to_css(dest)?;
+            dest.write_str(", ")?;
+        }
+
+        for (i, coord) in self.coordinates.iter().enumerate() {
+            if i > 0 {
+                dest.write_str(", ")?;
+            }
+
+            coord.0.to_css(dest)?;
+            dest.write_str(" ")?;
+            coord.1.to_css(dest)?;
+        }
+
+        dest.write_str(")")
+    }
+}
+
+impl<L: ToComputedValue> ToComputedValue for Polygon<L> {
+    type ComputedValue = Polygon<L::ComputedValue>;
+
+    #[inline]
+    fn to_computed_value(&self, cx: &Context) -> Self::ComputedValue {
+        Polygon {
+            fill: self.fill.to_computed_value(cx),
+            coordinates: self.coordinates.iter().map(|c| {
+                (c.0.to_computed_value(cx), c.1.to_computed_value(cx))
+            }).collect(),
+        }
+    }
+
+    #[inline]
+    fn from_computed_value(computed: &Self::ComputedValue) -> Self {
+        Polygon {
+            fill: ToComputedValue::from_computed_value(&computed.fill),
+            coordinates: computed.coordinates.iter().map(|c| {
+                (ToComputedValue::from_computed_value(&c.0),
+                 ToComputedValue::from_computed_value(&c.1))
+            }).collect(),
+        }
+    }
+}

components/style/values/specified/basic_shape.rs

@@ -18,6 +18,7 @@ use values::computed::{ComputedValueAsSpecified, Context, ToComputedValue};
 use values::computed::basic_shape as computed_basic_shape;
 use values::generics::BorderRadiusSize;
 use values::generics::basic_shape::{BorderRadius as GenericBorderRadius, ShapeRadius as GenericShapeRadius};
+use values::generics::basic_shape::Polygon as GenericPolygon;
 use values::specified::{LengthOrPercentage, Percentage};
 use values::specified::position::{Keyword, Position};
 use values::specified::url::SpecifiedUrl;
@@ -520,99 +521,8 @@ impl ToComputedValue for Ellipse {
     }
 }
 
-
-#[derive(Clone, PartialEq, Debug)]
-#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
-/// https://drafts.csswg.org/css-shapes/#funcdef-polygon
-#[allow(missing_docs)]
-pub struct Polygon {
-    pub fill: FillRule,
-    pub coordinates: Vec<(LengthOrPercentage, LengthOrPercentage)>,
-}
-
-impl Polygon {
-    #[allow(missing_docs)]
-    pub fn parse_function_arguments(context: &ParserContext, input: &mut Parser) -> Result<Polygon, ()> {
-        let fill = input.try(|input| {
-            let fill = FillRule::parse(input);
-            // only eat the comma if there is something before it
-            try!(input.expect_comma());
-            fill
-        }).ok().unwrap_or_else(Default::default);
-
-        let buf = try!(input.parse_comma_separated(|input| {
-            Ok((try!(LengthOrPercentage::parse(context, input)),
-                try!(LengthOrPercentage::parse(context, input))))
-        }));
-
-        Ok(Polygon {
-            fill: fill,
-            coordinates: buf,
-        })
-    }
-}
-
-impl Parse for Polygon {
-    fn parse(context: &ParserContext, input: &mut Parser) -> Result<Self, ()> {
-        match input.try(|i| i.expect_function()) {
-            Ok(ref s) if s.eq_ignore_ascii_case("polygon") =>
-                input.parse_nested_block(|i| Polygon::parse_function_arguments(context, i)),
-            _ => Err(())
-        }
-    }
-}
-
-impl ToCss for Polygon {
-    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-        try!(dest.write_str("polygon("));
-        let mut need_space = false;
-        if self.fill != Default::default() {
-            try!(self.fill.to_css(dest));
-            try!(dest.write_str(", "));
-        }
-
-        for coord in &self.coordinates {
-            if need_space {
-                try!(dest.write_str(", "));
-            }
-
-            try!(coord.0.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(coord.1.to_css(dest));
-            need_space = true;
-        }
-
-        dest.write_str(")")
-    }
-}
-
-impl ToComputedValue for Polygon {
-    type ComputedValue = computed_basic_shape::Polygon;
-
-    #[inline]
-    fn to_computed_value(&self, cx: &Context) -> Self::ComputedValue {
-        computed_basic_shape::Polygon {
-            fill: self.fill.to_computed_value(cx),
-            coordinates: self.coordinates.iter()
-                                         .map(|c| {
-                                            (c.0.to_computed_value(cx),
-                                             c.1.to_computed_value(cx))
-                                         }).collect(),
-        }
-    }
-
-    #[inline]
-    fn from_computed_value(computed: &Self::ComputedValue) -> Self {
-        Polygon {
-            fill: ToComputedValue::from_computed_value(&computed.fill),
-            coordinates: computed.coordinates.iter()
-                                             .map(|c| {
-                                                (ToComputedValue::from_computed_value(&c.0),
-                                                 ToComputedValue::from_computed_value(&c.1))
-                                             }).collect(),
-        }
-    }
-}
+/// The specified value of `Polygon`
+pub type Polygon = GenericPolygon<LengthOrPercentage>;
 
 /// The specified value of `ShapeRadius`
 pub type ShapeRadius = GenericShapeRadius<LengthOrPercentage>;
@@ -677,23 +587,6 @@ fn parse_one_set_of_border_values(context: &ParserContext, mut input: &mut Parse
     }
 }
 
-// https://drafts.csswg.org/css-shapes/#typedef-fill-rule
-// NOTE: Basic shapes spec says that these are the only two values, however
-// https://www.w3.org/TR/SVG/painting.html#FillRuleProperty
-// says that it can also be `inherit`
-define_css_keyword_enum!(FillRule:
-    "nonzero" => NonZero,
-    "evenodd" => EvenOdd
-);
-
-impl ComputedValueAsSpecified for FillRule {}
-
-impl Default for FillRule {
-    fn default() -> Self {
-        FillRule::NonZero
-    }
-}
-
 /// https://drafts.fxtf.org/css-masking-1/#typedef-geometry-box
 #[derive(Clone, PartialEq, Copy, Debug)]
 #[cfg_attr(feature = "servo", derive(HeapSizeOf))]