Auto merge of #17186 - servo:derive-all-the-things, r=emilio

Use more generics and remove more code from mako files

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9 files changed, 159 insertions, 164 deletions

diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index 2186967279a..3c8e359e4de 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -2232,23 +2232,16 @@ fn static_assert() {
     }
     % endfor
 
-    pub fn set_scroll_snap_points_x(&mut self, v: longhands::scroll_snap_points_x::computed_value::T) {
-        match v.0 {
-            None => self.gecko.mScrollSnapPointsX.set_value(CoordDataValue::None),
-            Some(l) => l.to_gecko_style_coord(&mut self.gecko.mScrollSnapPointsX),
-        };
-    }
-
-    ${impl_coord_copy('scroll_snap_points_x', 'mScrollSnapPointsX')}
-
-    pub fn set_scroll_snap_points_y(&mut self, v: longhands::scroll_snap_points_y::computed_value::T) {
-        match v.0 {
-            None => self.gecko.mScrollSnapPointsY.set_value(CoordDataValue::None),
-            Some(l) => l.to_gecko_style_coord(&mut self.gecko.mScrollSnapPointsY),
-        };
-    }
+    % for axis in ["x", "y"]:
+        pub fn set_scroll_snap_points_${axis}(&mut self, v: longhands::scroll_snap_points_${axis}::computed_value::T) {
+            match v.repeated() {
+                None => self.gecko.mScrollSnapPoints${axis.upper()}.set_value(CoordDataValue::None),
+                Some(l) => l.to_gecko_style_coord(&mut self.gecko.mScrollSnapPoints${axis.upper()}),
+            };
+        }
 
-    ${impl_coord_copy('scroll_snap_points_y', 'mScrollSnapPointsY')}
+        ${impl_coord_copy('scroll_snap_points_' + axis, 'mScrollSnapPoints' + axis.upper())}
+    % endfor
 
     pub fn set_scroll_snap_coordinate<I>(&mut self, v: I)
         where I: IntoIterator<Item = longhands::scroll_snap_coordinate::computed_value::single_value::T>,
diff --git a/components/style/properties/helpers/animated_properties.mako.rs b/components/style/properties/helpers/animated_properties.mako.rs
index f018967fb9a..d98b66b8e29 100644
--- a/components/style/properties/helpers/animated_properties.mako.rs
+++ b/components/style/properties/helpers/animated_properties.mako.rs
@@ -39,9 +39,8 @@ use values::CSSFloat;
 use values::{Auto, Either};
 use values::computed::{Angle, LengthOrPercentageOrAuto, LengthOrPercentageOrNone};
 use values::computed::{BorderCornerRadius, ClipRect};
-use values::computed::{CalcLengthOrPercentage, Context, LengthOrPercentage};
-use values::computed::{MaxLength, MozLength};
-use values::computed::ToComputedValue;
+use values::computed::{CalcLengthOrPercentage, Context, ComputedValueAsSpecified};
+use values::computed::{LengthOrPercentage, MaxLength, MozLength, ToComputedValue};
 use values::generics::{SVGPaint, SVGPaintKind};
 use values::generics::border::BorderCornerRadius as GenericBorderCornerRadius;
 use values::generics::position as generic_position;
@@ -73,6 +72,10 @@ pub enum TransitionProperty {
     Unsupported(Atom)
 }
 
+no_viewport_percentage!(TransitionProperty);
+
+impl ComputedValueAsSpecified for TransitionProperty {}
+
 impl TransitionProperty {
     /// Iterates over each longhand property.
     pub fn each<F: FnMut(&TransitionProperty) -> ()>(mut cb: F) {
diff --git a/components/style/properties/longhand/box.mako.rs b/components/style/properties/longhand/box.mako.rs
index 8ab5e298dbf..623810c8724 100644
--- a/components/style/properties/longhand/box.mako.rs
+++ b/components/style/properties/longhand/box.mako.rs
@@ -424,36 +424,17 @@ ${helpers.predefined_type("transition-timing-function",
                           extra_prefixes="moz webkit",
                           spec="https://drafts.csswg.org/css-transitions/#propdef-transition-timing-function")}
 
-<%helpers:vector_longhand name="transition-property"
-                          allow_empty="True"
-                          need_index="True"
-                          animation_value_type="none"
-                          extra_prefixes="moz webkit"
-                          spec="https://drafts.csswg.org/css-transitions/#propdef-transition-property">
-
-    use values::computed::ComputedValueAsSpecified;
-
-    pub use properties::animated_properties::TransitionProperty;
-    pub use properties::animated_properties::TransitionProperty as SpecifiedValue;
-
-    pub mod computed_value {
-        // NB: Can't generate the type here because it needs all the longhands
-        // generated beforehand.
-        pub use super::SpecifiedValue as T;
-    }
-
-    pub fn parse(_context: &ParserContext, input: &mut Parser) -> Result<SpecifiedValue,()> {
-        SpecifiedValue::parse(input)
-    }
-
-    pub fn get_initial_specified_value() -> SpecifiedValue {
-        TransitionProperty::All
-    }
-
-    no_viewport_percentage!(SpecifiedValue);
-
-    impl ComputedValueAsSpecified for SpecifiedValue { }
-</%helpers:vector_longhand>
+${helpers.predefined_type("transition-property",
+                          "TransitionProperty",
+                          "computed::TransitionProperty::All",
+                          initial_specified_value="specified::TransitionProperty::All",
+                          vector=True,
+                          allow_empty=True,
+                          need_index=True,
+                          needs_context=False,
+                          animation_value_type="none",
+                          extra_prefixes="moz webkit",
+                          spec="https://drafts.csswg.org/css-transitions/#propdef-transition-property")}
 
 ${helpers.predefined_type("transition-delay",
                           "Time",
@@ -463,7 +444,7 @@ ${helpers.predefined_type("transition-delay",
                           need_index=True,
                           animation_value_type="none",
                           extra_prefixes="moz webkit",
-                          spec="https://drafts.csswg.org/css-transitions/#propdef-transition-duration")}
+                          spec="https://drafts.csswg.org/css-transitions/#propdef-transition-delay")}
 
 <%helpers:vector_longhand name="animation-name"
                           need_index="True"
@@ -547,18 +528,16 @@ ${helpers.predefined_type("animation-duration",
                           extra_prefixes="moz webkit",
                           spec="https://drafts.csswg.org/css-transitions/#propdef-transition-duration")}
 
-<%helpers:vector_longhand name="animation-timing-function"
-                          need_index="True"
+${helpers.predefined_type("animation-timing-function",
+                          "TimingFunction",
+                          "computed::TimingFunction::ease()",
+                          initial_specified_value="specified::TimingFunction::ease()",
+                          vector=True,
+                          need_index=True,
                           animation_value_type="none",
-                          extra_prefixes="moz webkit"
-                          spec="https://drafts.csswg.org/css-animations/#propdef-animation-timing-function",
-                          allowed_in_keyframe_block="True">
-    pub use properties::longhands::transition_timing_function::single_value::computed_value;
-    pub use properties::longhands::transition_timing_function::single_value::get_initial_value;
-    pub use properties::longhands::transition_timing_function::single_value::get_initial_specified_value;
-    pub use properties::longhands::transition_timing_function::single_value::parse;
-    pub use properties::longhands::transition_timing_function::single_value::SpecifiedValue;
-</%helpers:vector_longhand>
+                          extra_prefixes="moz webkit",
+                          allowed_in_keyframe_block=True,
+                          spec="https://drafts.csswg.org/css-transitions/#propdef-animation-timing-function")}
 
 <%helpers:vector_longhand name="animation-iteration-count"
                           need_index="True"
@@ -660,111 +639,28 @@ ${helpers.single_keyword("animation-fill-mode",
                          spec="https://drafts.csswg.org/css-animations/#propdef-animation-fill-mode",
                          allowed_in_keyframe_block=False)}
 
-<%helpers:vector_longhand name="animation-delay"
-                          need_index="True"
+${helpers.predefined_type("animation-delay",
+                          "Time",
+                          "computed::Time::zero()",
+                          initial_specified_value="specified::Time::zero()",
+                          vector=True,
+                          need_index=True,
                           animation_value_type="none",
                           extra_prefixes="moz webkit",
                           spec="https://drafts.csswg.org/css-animations/#propdef-animation-delay",
-                          allowed_in_keyframe_block="False">
-    pub use properties::longhands::transition_delay::single_value::computed_value;
-    pub use properties::longhands::transition_delay::single_value::get_initial_specified_value;
-    pub use properties::longhands::transition_delay::single_value::{get_initial_value, parse};
-    pub use properties::longhands::transition_delay::single_value::SpecifiedValue;
-</%helpers:vector_longhand>
-
-<%helpers:longhand products="gecko" name="scroll-snap-points-y" animation_value_type="none"
-                   spec="Nonstandard (https://www.w3.org/TR/2015/WD-css-snappoints-1-20150326/#scroll-snap-points)">
-    use std::fmt;
-    use style_traits::ToCss;
-    use values::specified::LengthOrPercentage;
-
-    pub mod computed_value {
-        use values::computed::LengthOrPercentage;
-
-        #[derive(Debug, Clone, PartialEq)]
-        #[cfg_attr(feature = "servo", derive(HeapSizeOf))]
-        pub struct T(pub Option<LengthOrPercentage>);
-    }
-
-    #[derive(Clone, Debug, HasViewportPercentage, PartialEq)]
-    #[cfg_attr(feature = "servo", derive(HeapSizeOf))]
-    pub enum SpecifiedValue {
-        None,
-        Repeat(LengthOrPercentage),
-    }
-
-    impl ToCss for computed_value::T {
-        fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-            match self.0 {
-                None => dest.write_str("none"),
-                Some(ref l) => {
-                    try!(dest.write_str("repeat("));
-                    try!(l.to_css(dest));
-                    dest.write_str(")")
-                },
-            }
-        }
-    }
-    impl ToCss for SpecifiedValue {
-        fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-            match *self {
-                SpecifiedValue::None => dest.write_str("none"),
-                SpecifiedValue::Repeat(ref l) => {
-                    try!(dest.write_str("repeat("));
-                    try!(l.to_css(dest));
-                    dest.write_str(")")
-                },
-            }
-        }
-    }
-
-    #[inline]
-    pub fn get_initial_value() -> computed_value::T {
-        computed_value::T(None)
-    }
-
-    impl ToComputedValue for SpecifiedValue {
-        type ComputedValue = computed_value::T;
-
-        #[inline]
-        fn to_computed_value(&self, context: &Context) -> computed_value::T {
-            match *self {
-                SpecifiedValue::None => computed_value::T(None),
-                SpecifiedValue::Repeat(ref l) =>
-                    computed_value::T(Some(l.to_computed_value(context))),
-            }
-        }
-        #[inline]
-        fn from_computed_value(computed: &computed_value::T) -> Self {
-            match *computed {
-                computed_value::T(None) => SpecifiedValue::None,
-                computed_value::T(Some(l)) =>
-                    SpecifiedValue::Repeat(ToComputedValue::from_computed_value(&l))
-            }
-        }
-    }
-
-    pub fn parse(context: &ParserContext, input: &mut Parser) -> Result<SpecifiedValue, ()> {
-        if input.try(|input| input.expect_ident_matching("none")).is_ok() {
-            Ok(SpecifiedValue::None)
-        } else if input.try(|input| input.expect_function_matching("repeat")).is_ok() {
-            input.parse_nested_block(|input| {
-                LengthOrPercentage::parse_non_negative(context, input).map(SpecifiedValue::Repeat)
-            })
-        } else {
-            Err(())
-        }
-    }
-</%helpers:longhand>
-
-<%helpers:longhand products="gecko" name="scroll-snap-points-x" animation_value_type="none"
-                   spec="Nonstandard (https://www.w3.org/TR/2015/WD-css-snappoints-1-20150326/#scroll-snap-points)">
-    pub use super::scroll_snap_points_y::SpecifiedValue;
-    pub use super::scroll_snap_points_y::computed_value;
-    pub use super::scroll_snap_points_y::get_initial_value;
-    pub use super::scroll_snap_points_y::parse;
-</%helpers:longhand>
-
+                          allowed_in_keyframe_block=False)}
+
+% for axis in ["x", "y"]:
+    ${helpers.predefined_type(
+        "scroll-snap-points-" + axis,
+        "ScrollSnapPoint",
+        "computed::ScrollSnapPoint::none()",
+        animation_value_type="none",
+        products="gecko",
+        disable_when_testing=True,
+        spec="Nonstandard (https://www.w3.org/TR/2015/WD-css-snappoints-1-20150326/#scroll-snap-points)",
+    )}
+% endfor
 
 ${helpers.predefined_type("scroll-snap-destination",
                           "Position",
diff --git a/components/style/values/computed/gecko.rs b/components/style/values/computed/gecko.rs
new file mode 100644
index 00000000000..96ca82669cd
--- /dev/null
+++ b/components/style/values/computed/gecko.rs
@@ -0,0 +1,11 @@
+/* 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/. */
+
+//! Computed types for legacy Gecko-only properties.
+
+use values::computed::length::LengthOrPercentage;
+use values::generics::gecko::ScrollSnapPoint as GenericScrollSnapPoint;
+
+/// A computed type for scroll snap points.
+pub type ScrollSnapPoint = GenericScrollSnapPoint<LengthOrPercentage>;
diff --git a/components/style/values/computed/mod.rs b/components/style/values/computed/mod.rs
index 26165dc4e13..acfc09f5c80 100644
--- a/components/style/values/computed/mod.rs
+++ b/components/style/values/computed/mod.rs
@@ -23,10 +23,13 @@ use super::specified;
 
 pub use app_units::Au;
 pub use cssparser::Color as CSSColor;
+pub use properties::animated_properties::TransitionProperty;
 pub use self::background::BackgroundSize;
 pub use self::border::{BorderImageSlice, BorderImageWidth, BorderImageSideWidth};
 pub use self::border::{BorderRadius, BorderCornerRadius};
 pub use self::image::{Gradient, GradientItem, ImageLayer, LineDirection, Image, ImageRect};
+#[cfg(feature = "gecko")]
+pub use self::gecko::ScrollSnapPoint;
 pub use self::rect::LengthOrNumberRect;
 pub use super::{Auto, Either, None_};
 #[cfg(feature = "gecko")]
@@ -45,6 +48,8 @@ pub mod background;
 pub mod basic_shape;
 pub mod border;
 pub mod image;
+#[cfg(feature = "gecko")]
+pub mod gecko;
 pub mod length;
 pub mod position;
 pub mod rect;
diff --git a/components/style/values/generics/gecko.rs b/components/style/values/generics/gecko.rs
new file mode 100644
index 00000000000..52c7b130992
--- /dev/null
+++ b/components/style/values/generics/gecko.rs
@@ -0,0 +1,54 @@
+/* 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 types for legacy Gecko-only properties that should probably be
+//! unshipped at some point in the future.
+
+use std::fmt;
+use style_traits::ToCss;
+
+/// A generic value for scroll snap points.
+#[derive(Clone, Copy, Debug, HasViewportPercentage, PartialEq, ToComputedValue)]
+pub enum ScrollSnapPoint<LengthOrPercentage> {
+    /// `none`
+    None,
+    /// `repeat(<length-or-percentage>)`
+    Repeat(LengthOrPercentage)
+}
+
+impl<L> ScrollSnapPoint<L> {
+    /// Returns `none`.
+    #[inline]
+    pub fn none() -> Self {
+        ScrollSnapPoint::None
+    }
+
+    /// Returns the repeat argument, if any.
+    #[inline]
+    pub fn repeated(&self) -> Option<&L> {
+        match *self {
+            ScrollSnapPoint::None => None,
+            ScrollSnapPoint::Repeat(ref length) => Some(length),
+        }
+    }
+}
+
+impl<L> ToCss for ScrollSnapPoint<L>
+where
+    L: ToCss,
+{
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result
+    where
+        W: fmt::Write,
+    {
+        match *self {
+            ScrollSnapPoint::None => dest.write_str("none"),
+            ScrollSnapPoint::Repeat(ref length) => {
+                dest.write_str("repeat(")?;
+                length.to_css(dest)?;
+                dest.write_str(")")
+            },
+        }
+    }
+}
diff --git a/components/style/values/generics/mod.rs b/components/style/values/generics/mod.rs
index 3ff55fda6c8..ef88d7c342c 100644
--- a/components/style/values/generics/mod.rs
+++ b/components/style/values/generics/mod.rs
@@ -16,6 +16,8 @@ use values::specified::url::SpecifiedUrl;
 pub mod background;
 pub mod basic_shape;
 pub mod border;
+#[cfg(feature = "gecko")]
+pub mod gecko;
 pub mod grid;
 pub mod image;
 pub mod position;
diff --git a/components/style/values/specified/gecko.rs b/components/style/values/specified/gecko.rs
new file mode 100644
index 00000000000..08af968463e
--- /dev/null
+++ b/components/style/values/specified/gecko.rs
@@ -0,0 +1,26 @@
+/* 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/. */
+
+//! Specified types for legacy Gecko-only properties.
+
+use cssparser::Parser;
+use parser::{Parse, ParserContext};
+use values::generics::gecko::ScrollSnapPoint as GenericScrollSnapPoint;
+use values::specified::length::LengthOrPercentage;
+
+/// A specified type for scroll snap points.
+pub type ScrollSnapPoint = GenericScrollSnapPoint<LengthOrPercentage>;
+
+impl Parse for ScrollSnapPoint {
+    fn parse(context: &ParserContext, input: &mut Parser) -> Result<Self, ()> {
+        if input.try(|i| i.expect_ident_matching("none")).is_ok() {
+            return Ok(GenericScrollSnapPoint::None);
+        }
+        input.expect_function_matching("repeat")?;
+        let length = input.parse_nested_block(|i| {
+            LengthOrPercentage::parse_non_negative(context, i)
+        })?;
+        Ok(GenericScrollSnapPoint::Repeat(length))
+    }
+}
diff --git a/components/style/values/specified/mod.rs b/components/style/values/specified/mod.rs
index 2299362f6de..b198295064f 100644
--- a/components/style/values/specified/mod.rs
+++ b/components/style/values/specified/mod.rs
@@ -27,6 +27,7 @@ use super::generics::grid::TrackList as GenericTrackList;
 use values::computed::ComputedValueAsSpecified;
 use values::specified::calc::CalcNode;
 
+pub use properties::animated_properties::TransitionProperty;
 #[cfg(feature = "gecko")]
 pub use self::align::{AlignItems, AlignJustifyContent, AlignJustifySelf, JustifyItems};
 pub use self::background::BackgroundSize;
@@ -34,7 +35,8 @@ pub use self::border::{BorderCornerRadius, BorderImageSlice, BorderImageWidth};
 pub use self::border::{BorderImageSideWidth, BorderRadius, BorderSideWidth};
 pub use self::color::Color;
 pub use self::rect::LengthOrNumberRect;
-pub use super::generics::grid::GridLine;
+#[cfg(feature = "gecko")]
+pub use self::gecko::ScrollSnapPoint;
 pub use self::image::{ColorStop, EndingShape as GradientEndingShape, Gradient};
 pub use self::image::{GradientItem, GradientKind, Image, ImageRect, ImageLayer};
 pub use self::length::AbsoluteLength;
@@ -45,6 +47,7 @@ pub use self::length::{MaxLength, MozLength};
 pub use self::position::{Position, PositionComponent};
 pub use self::text::{LetterSpacing, LineHeight, WordSpacing};
 pub use self::transform::{TimingFunction, TransformOrigin};
+pub use super::generics::grid::GridLine;
 
 #[cfg(feature = "gecko")]
 pub mod align;
@@ -53,6 +56,8 @@ pub mod basic_shape;
 pub mod border;
 pub mod calc;
 pub mod color;
+#[cfg(feature = "gecko")]
+pub mod gecko;
 pub mod grid;
 pub mod image;
 pub mod length;