style: Move Ratio into independent files.

Based on https://drafts.csswg.org/css-values/#ratios, <ratio> should be
a general types in css values, and now the media query and the position use
this type, so let's move it into the independent files.

Differential Revision: https://phabricator.services.mozilla.com/D106218

components/style/gecko/media_features.rs

@@ -10,8 +10,8 @@ use crate::media_queries::media_feature::{AllowsRanges, ParsingRequirements};
 use crate::media_queries::media_feature::{Evaluator, MediaFeatureDescription};
 use crate::media_queries::media_feature_expression::RangeOrOperator;
 use crate::media_queries::{Device, MediaType};
-use crate::values::computed::position::Ratio;
 use crate::values::computed::CSSPixelLength;
+use crate::values::computed::Ratio;
 use crate::values::computed::Resolution;
 use crate::Atom;
 use app_units::Au;

components/style/media_queries/media_feature.rs

@@ -7,7 +7,7 @@
 use super::media_feature_expression::RangeOrOperator;
 use super::Device;
 use crate::parser::ParserContext;
-use crate::values::computed::position::Ratio;
+use crate::values::computed::Ratio;
 use crate::values::computed::{CSSPixelLength, Resolution};
 use crate::Atom;
 use cssparser::Parser;

components/style/media_queries/media_feature_expression.rs

@@ -15,8 +15,7 @@ use crate::parser::{Parse, ParserContext};
 #[cfg(feature = "servo")]
 use crate::servo::media_queries::MEDIA_FEATURES;
 use crate::str::{starts_with_ignore_ascii_case, string_as_ascii_lowercase};
-use crate::values::computed::position::Ratio;
-use crate::values::computed::{self, ToComputedValue};
+use crate::values::computed::{self, Ratio, ToComputedValue};
 use crate::values::specified::{Integer, Length, Number, Resolution};
 use crate::values::{serialize_atom_identifier, CSSFloat};
 use crate::{Atom, Zero};
@@ -498,15 +497,9 @@ impl MediaExpressionValue {
                 MediaExpressionValue::Float(number.get())
             },
             Evaluator::NumberRatio(..) => {
-                use crate::values::generics::position::Ratio as GenericRatio;
-                use crate::values::generics::NonNegative;
-                use crate::values::specified::position::Ratio;
-
-                let ratio = Ratio::parse(context, input)?;
-                MediaExpressionValue::NumberRatio(GenericRatio(
-                    NonNegative(ratio.0.get()),
-                    NonNegative(ratio.1.get()),
-                ))
+                use crate::values::specified::Ratio as SpecifiedRatio;
+                let ratio = SpecifiedRatio::parse(context, input)?;
+                MediaExpressionValue::NumberRatio(Ratio::new(ratio.0.get(), ratio.1.get()))
             },
             Evaluator::Resolution(..) => {
                 MediaExpressionValue::Resolution(Resolution::parse(context, input)?)

components/style/values/computed/mod.rs

@@ -77,6 +77,7 @@ pub use self::position::AspectRatio;
 pub use self::position::{
     GridAutoFlow, GridTemplateAreas, MasonryAutoFlow, Position, PositionOrAuto, ZIndex,
 };
+pub use self::ratio::Ratio;
 pub use self::rect::NonNegativeLengthOrNumberRect;
 pub use self::resolution::Resolution;
 pub use self::svg::MozContextProperties;
@@ -122,6 +123,7 @@ pub mod outline;
 pub mod page;
 pub mod percentage;
 pub mod position;
+pub mod ratio;
 pub mod rect;
 pub mod resolution;
 pub mod svg;

components/style/values/computed/position.rs

@@ -12,11 +12,9 @@ use crate::values::generics::position::AspectRatio as GenericAspectRatio;
 use crate::values::generics::position::Position as GenericPosition;
 use crate::values::generics::position::PositionComponent as GenericPositionComponent;
 use crate::values::generics::position::PositionOrAuto as GenericPositionOrAuto;
-use crate::values::generics::position::Ratio as GenericRatio;
 use crate::values::generics::position::ZIndex as GenericZIndex;
 pub use crate::values::specified::position::{GridAutoFlow, GridTemplateAreas, MasonryAutoFlow};
-use crate::{One, Zero};
-use std::cmp::{Ordering, PartialOrd};
+use crate::Zero;
 use std::fmt::{self, Write};
 use style_traits::{CssWriter, ToCss};
 
@@ -72,34 +70,5 @@ impl GenericPositionComponent for LengthPercentage {
 /// A computed value for the `z-index` property.
 pub type ZIndex = GenericZIndex<Integer>;
 
-/// A computed <ratio> value.
-pub type Ratio = GenericRatio<NonNegativeNumber>;
-
-impl PartialOrd for Ratio {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        f64::partial_cmp(
-            &((self.0).0 as f64 * (other.1).0 as f64),
-            &((self.1).0 as f64 * (other.0).0 as f64),
-        )
-    }
-}
-
-impl Ratio {
-    /// Returns a new Ratio.
-    pub fn new(a: f32, b: f32) -> Self {
-        GenericRatio(a.into(), b.into())
-    }
-
-    /// Returns the used value. A ratio of 0/0 behaves as the ratio 1/0.
-    /// https://drafts.csswg.org/css-values-4/#ratios
-    pub fn used_value(self) -> Self {
-        if self.0.is_zero() && self.1.is_zero() {
-            Ratio::new(One::one(), Zero::zero())
-        } else {
-            self
-        }
-    }
-}
-
 /// A computed value for the `aspect-ratio` property.
 pub type AspectRatio = GenericAspectRatio<NonNegativeNumber>;

components/style/values/computed/ratio.rs

@@ -0,0 +1,39 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+//! `<ratio>` computed values.
+
+use crate::values::computed::NonNegativeNumber;
+use crate::values::generics::ratio::Ratio as GenericRatio;
+use crate::{One, Zero};
+use std::cmp::{Ordering, PartialOrd};
+
+/// A computed <ratio> value.
+pub type Ratio = GenericRatio<NonNegativeNumber>;
+
+impl PartialOrd for Ratio {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        f64::partial_cmp(
+            &((self.0).0 as f64 * (other.1).0 as f64),
+            &((self.1).0 as f64 * (other.0).0 as f64),
+        )
+    }
+}
+
+impl Ratio {
+    /// Returns a new Ratio.
+    pub fn new(a: f32, b: f32) -> Self {
+        GenericRatio(a.into(), b.into())
+    }
+
+    /// Returns the used value. A ratio of 0/0 behaves as the ratio 1/0.
+    /// https://drafts.csswg.org/css-values-4/#ratios
+    pub fn used_value(self) -> Self {
+        if self.0.is_zero() && self.1.is_zero() {
+            Ratio::new(One::one(), Zero::zero())
+        } else {
+            self
+        }
+    }
+}

components/style/values/generics/mod.rs

@@ -11,8 +11,7 @@ use crate::parser::{Parse, ParserContext};
 use crate::Zero;
 use cssparser::Parser;
 use std::ops::Add;
-use style_traits::{KeywordsCollectFn, ParseError};
-use style_traits::{SpecifiedValueInfo, StyleParseErrorKind};
+use style_traits::{KeywordsCollectFn, ParseError, SpecifiedValueInfo, StyleParseErrorKind};
 
 pub mod background;
 pub mod basic_shape;
@@ -33,6 +32,7 @@ pub mod length;
 pub mod motion;
 pub mod page;
 pub mod position;
+pub mod ratio;
 pub mod rect;
 pub mod size;
 pub mod svg;

components/style/values/generics/position.rs

@@ -5,8 +5,7 @@
 //! Generic types for CSS handling of specified and computed values of
 //! [`position`](https://drafts.csswg.org/css-backgrounds-3/#position)
 
-use std::fmt::{self, Write};
-use style_traits::{CssWriter, ToCss};
+use crate::values::generics::ratio::Ratio;
 
 /// A generic type for representing a CSS [position](https://drafts.csswg.org/css-values/#position).
 #[derive(
@@ -154,50 +153,6 @@ impl<Integer> ZIndex<Integer> {
     }
 }
 
-/// A generic value for the `<ratio>` value.
-#[derive(
-    Animate,
-    Clone,
-    ComputeSquaredDistance,
-    Copy,
-    Debug,
-    MallocSizeOf,
-    PartialEq,
-    SpecifiedValueInfo,
-    ToAnimatedZero,
-    ToComputedValue,
-    ToResolvedValue,
-    ToShmem,
-)]
-#[repr(C)]
-pub struct Ratio<N>(pub N, pub N);
-
-impl<N> ToCss for Ratio<N>
-where
-    N: ToCss
-{
-    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
-    where
-        W: Write,
-    {
-        self.0.to_css(dest)?;
-        // Even though 1 could be omitted, we don't per
-        // https://drafts.csswg.org/css-values-4/#ratio-value:
-        //
-        //     The second <number> is optional, defaulting to 1. However,
-        //     <ratio> is always serialized with both components.
-        //
-        // And for compat reasons, see bug 1669742.
-        //
-        // We serialize with spaces for consistency with all other
-        // slash-delimited things, see
-        // https://github.com/w3c/csswg-drafts/issues/4282
-        dest.write_str(" / ")?;
-        self.1.to_css(dest)?;
-        Ok(())
-    }
-}
-
 /// Ratio or None.
 #[derive(
     Animate,

components/style/values/generics/ratio.rs

@@ -0,0 +1,53 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+//! Generic types for CSS values related to <ratio>.
+//! https://drafts.csswg.org/css-values/#ratios
+
+use std::fmt::{self, Write};
+use style_traits::{CssWriter, ToCss};
+
+/// A generic value for the `<ratio>` value.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C)]
+pub struct Ratio<N>(pub N, pub N);
+
+impl<N> ToCss for Ratio<N>
+where
+    N: ToCss,
+{
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        self.0.to_css(dest)?;
+        // Even though 1 could be omitted, we don't per
+        // https://drafts.csswg.org/css-values-4/#ratio-value:
+        //
+        //     The second <number> is optional, defaulting to 1. However,
+        //     <ratio> is always serialized with both components.
+        //
+        // And for compat reasons, see bug 1669742.
+        //
+        // We serialize with spaces for consistency with all other
+        // slash-delimited things, see
+        // https://github.com/w3c/csswg-drafts/issues/4282
+        dest.write_str(" / ")?;
+        self.1.to_css(dest)?;
+        Ok(())
+    }
+}

components/style/values/specified/mod.rs

@@ -77,6 +77,7 @@ pub use self::position::{
     GridAutoFlow, GridTemplateAreas, MasonryAutoFlow, Position, PositionOrAuto,
 };
 pub use self::position::{PositionComponent, ZIndex};
+pub use self::ratio::Ratio;
 pub use self::rect::NonNegativeLengthOrNumberRect;
 pub use self::resolution::Resolution;
 pub use self::svg::MozContextProperties;
@@ -124,6 +125,7 @@ pub mod outline;
 pub mod percentage;
 pub mod page;
 pub mod position;
+pub mod ratio;
 pub mod rect;
 pub mod resolution;
 pub mod source_size_list;

components/style/values/specified/position.rs

@@ -16,10 +16,9 @@ use crate::values::generics::position::AspectRatio as GenericAspectRatio;
 use crate::values::generics::position::Position as GenericPosition;
 use crate::values::generics::position::PositionComponent as GenericPositionComponent;
 use crate::values::generics::position::PositionOrAuto as GenericPositionOrAuto;
-use crate::values::generics::position::Ratio as GenericRatio;
 use crate::values::generics::position::ZIndex as GenericZIndex;
 use crate::values::specified::{AllowQuirks, Integer, LengthPercentage, NonNegativeNumber};
-use crate::{Atom, One, Zero};
+use crate::{Atom, Zero};
 use cssparser::Parser;
 use selectors::parser::SelectorParseErrorKind;
 use servo_arc::Arc;
@@ -900,6 +899,7 @@ impl Parse for AspectRatio {
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
         use crate::values::generics::position::PreferredRatio;
+        use crate::values::specified::Ratio;
 
         let location = input.current_source_location();
         let mut auto = input.try_parse(|i| i.expect_ident_matching("auto"));
@@ -926,31 +926,13 @@ impl AspectRatio {
     /// Returns Self by a valid ratio.
     pub fn from_mapped_ratio(w: f32, h: f32) -> Self {
         use crate::values::generics::position::PreferredRatio;
+        use crate::values::generics::ratio::Ratio;
         AspectRatio {
             auto: true,
-            ratio: PreferredRatio::Ratio(GenericRatio(
+            ratio: PreferredRatio::Ratio(Ratio(
                 NonNegativeNumber::new(w),
                 NonNegativeNumber::new(h),
             )),
         }
     }
 }
-
-/// A specified <ratio> value.
-pub type Ratio = GenericRatio<NonNegativeNumber>;
-
-// https://drafts.csswg.org/css-values-4/#ratios
-impl Parse for Ratio {
-    fn parse<'i, 't>(
-        context: &ParserContext,
-        input: &mut Parser<'i, 't>,
-    ) -> Result<Self, ParseError<'i>> {
-        let a = NonNegativeNumber::parse(context, input)?;
-        let b = match input.try_parse(|input| input.expect_delim('/')) {
-            Ok(()) => NonNegativeNumber::parse(context, input)?,
-            _ => One::one(),
-        };
-
-        Ok(GenericRatio(a, b))
-    }
-}

components/style/values/specified/ratio.rs

@@ -0,0 +1,32 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+//! Specified types for <ratio>.
+//!
+//! [ratio]: https://drafts.csswg.org/css-values/#ratios
+
+use crate::parser::{Parse, ParserContext};
+use crate::values::generics::ratio::Ratio as GenericRatio;
+use crate::values::specified::NonNegativeNumber;
+use crate::One;
+use cssparser::Parser;
+use style_traits::ParseError;
+
+/// A specified <ratio> value.
+pub type Ratio = GenericRatio<NonNegativeNumber>;
+
+impl Parse for Ratio {
+    fn parse<'i, 't>(
+        context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<Self, ParseError<'i>> {
+        let a = NonNegativeNumber::parse(context, input)?;
+        let b = match input.try_parse(|input| input.expect_delim('/')) {
+            Ok(()) => NonNegativeNumber::parse(context, input)?,
+            _ => One::one(),
+        };
+
+        Ok(GenericRatio(a, b))
+    }
+}