style: Move extremum lengths to the individual Size / MaxSize types

This will prevent growing them when introducing fit-content(<length>).

This can _almost_ be derived, if it wasn't because of the quirky stuff.
I think the macro is probably good enough for now but let me know if you
disagree.

Differential Revision: https://phabricator.services.mozilla.com/D106713

components/style/values/computed/length.rs

@@ -185,7 +185,10 @@ impl Size {
             GenericSize::Auto => false,
             GenericSize::LengthPercentage(ref lp) => lp.is_definitely_zero(),
             #[cfg(feature = "gecko")]
-            GenericSize::ExtremumLength(..) => false,
+            GenericSize::MinContent |
+            GenericSize::MaxContent |
+            GenericSize::MozFitContent |
+            GenericSize::MozAvailable => false
         }
     }
 }
@@ -495,37 +498,6 @@ pub type NonNegativeLengthPercentageOrNormal =
 /// Either a non-negative `<length>` or a `<number>`.
 pub type NonNegativeLengthOrNumber = GenericLengthOrNumber<NonNegativeLength, NonNegativeNumber>;
 
-/// A type for possible values for min- and max- flavors of width, height,
-/// block-size, and inline-size.
-#[allow(missing_docs)]
-#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
-#[derive(
-    Clone,
-    Copy,
-    Debug,
-    Eq,
-    FromPrimitive,
-    MallocSizeOf,
-    Parse,
-    PartialEq,
-    SpecifiedValueInfo,
-    ToAnimatedValue,
-    ToAnimatedZero,
-    ToComputedValue,
-    ToCss,
-    ToResolvedValue,
-    ToShmem,
-)]
-#[repr(u8)]
-pub enum ExtremumLength {
-    #[parse(aliases = "-moz-max-content")]
-    MaxContent,
-    #[parse(aliases = "-moz-min-content")]
-    MinContent,
-    MozFitContent,
-    MozAvailable,
-}
-
 /// A computed value for `min-width`, `min-height`, `width` or `height` property.
 pub type Size = GenericSize<NonNegativeLengthPercentage>;
 

components/style/values/computed/mod.rs

@@ -63,7 +63,7 @@ pub use self::font::{FontVariantAlternates, FontWeight};
 pub use self::font::{FontVariantEastAsian, FontVariationSettings};
 pub use self::font::{MathDepth, MozScriptMinSize, MozScriptSizeMultiplier, XLang, XTextZoom};
 pub use self::image::{Gradient, Image, LineDirection, MozImageRect};
-pub use self::length::{CSSPixelLength, ExtremumLength, NonNegativeLength};
+pub use self::length::{CSSPixelLength, NonNegativeLength};
 pub use self::length::{Length, LengthOrNumber, LengthPercentage, NonNegativeLengthOrNumber};
 pub use self::length::{LengthOrAuto, LengthPercentageOrAuto, MaxSize, Size};
 pub use self::length::{NonNegativeLengthPercentage, NonNegativeLengthPercentageOrAuto};

components/style/values/generics/length.rs

@@ -6,7 +6,6 @@
 
 use crate::parser::{Parse, ParserContext};
 #[cfg(feature = "gecko")]
-use crate::values::computed::ExtremumLength;
 use crate::Zero;
 use cssparser::Parser;
 use style_traits::ParseError;
@@ -151,9 +150,14 @@ impl<LengthPercentage: Parse> Parse for LengthPercentageOrAuto<LengthPercentage>
 pub enum GenericSize<LengthPercent> {
     LengthPercentage(LengthPercent),
     Auto,
-    #[cfg(feature = "gecko")]
     #[animation(error)]
-    ExtremumLength(ExtremumLength),
+    MaxContent,
+    #[animation(error)]
+    MinContent,
+    #[animation(error)]
+    MozFitContent,
+    #[animation(error)]
+    MozAvailable,
 }
 
 pub use self::GenericSize as Size;
@@ -194,9 +198,16 @@ impl<LengthPercentage> Size<LengthPercentage> {
 pub enum GenericMaxSize<LengthPercent> {
     LengthPercentage(LengthPercent),
     None,
-    #[cfg(feature = "gecko")]
     #[animation(error)]
-    ExtremumLength(ExtremumLength),
+    #[parse(aliases = "-moz-max-content")]
+    MaxContent,
+    #[animation(error)]
+    #[parse(aliases = "-moz-min-content")]
+    MinContent,
+    #[animation(error)]
+    MozFitContent,
+    #[animation(error)]
+    MozAvailable,
 }
 
 pub use self::GenericMaxSize as MaxSize;

components/style/values/specified/length.rs

@@ -1226,6 +1226,27 @@ impl Parse for Size {
     }
 }
 
+macro_rules! parse_size_non_length {
+    ($size:ident, $input:expr, $auto_or_none:expr => $auto_or_none_ident:ident) => {{
+        let size = $input.try_parse(|input| {
+            Ok(try_match_ident_ignore_ascii_case! { input,
+                #[cfg(feature = "gecko")]
+                "min-content" | "-moz-min-content" => $size::MinContent,
+                #[cfg(feature = "gecko")]
+                "max-content" | "-moz-max-content" => $size::MaxContent,
+                #[cfg(feature = "gecko")]
+                "-moz-fit-content" => $size::MozFitContent,
+                #[cfg(feature = "gecko")]
+                "-moz-available" => $size::MozAvailable,
+                $auto_or_none => $size::$auto_or_none_ident,
+            })
+        });
+        if size.is_ok() {
+            return size;
+        }
+    }};
+}
+
 impl Size {
     /// Parses, with quirks.
     pub fn parse_quirky<'i, 't>(
@@ -1233,16 +1254,7 @@ impl Size {
         input: &mut Parser<'i, 't>,
         allow_quirks: AllowQuirks,
     ) -> Result<Self, ParseError<'i>> {
-        #[cfg(feature = "gecko")]
-        {
-            if let Ok(l) = input.try_parse(computed::ExtremumLength::parse) {
-                return Ok(GenericSize::ExtremumLength(l));
-            }
-        }
-
-        if input.try_parse(|i| i.expect_ident_matching("auto")).is_ok() {
-            return Ok(GenericSize::Auto);
-        }
+        parse_size_non_length!(Size, input, "auto" => Auto);
 
         let length = NonNegativeLengthPercentage::parse_quirky(context, input, allow_quirks)?;
         Ok(GenericSize::LengthPercentage(length))
@@ -1274,16 +1286,7 @@ impl MaxSize {
         input: &mut Parser<'i, 't>,
         allow_quirks: AllowQuirks,
     ) -> Result<Self, ParseError<'i>> {
-        #[cfg(feature = "gecko")]
-        {
-            if let Ok(l) = input.try_parse(computed::ExtremumLength::parse) {
-                return Ok(GenericMaxSize::ExtremumLength(l));
-            }
-        }
-
-        if input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
-            return Ok(GenericMaxSize::None);
-        }
+        parse_size_non_length!(MaxSize, input, "none" => None);
 
         let length = NonNegativeLengthPercentage::parse_quirky(context, input, allow_quirks)?;
         Ok(GenericMaxSize::LengthPercentage(length))