Use generics for scroll-snap-points-*

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>;

components/style/values/computed/mod.rs

@@ -28,6 +28,8 @@ 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")]
@@ -46,6 +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;

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(")")
+            },
+        }
+    }
+}

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;

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))
+    }
+}

components/style/values/specified/mod.rs

@@ -35,7 +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;
@@ -46,6 +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;
@@ -54,6 +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;