style: Implement parsing for baseline-source

Differential Revision: https://phabricator.services.mozilla.com/D173884

components/style/properties/data.py

@@ -428,6 +428,7 @@ class Longhand(Property):
                 "AlignSelf",
                 "Appearance",
                 "AspectRatio",
+                "BaselineSource",
                 "BreakBetween",
                 "BreakWithin",
                 "BackgroundRepeat",
@@ -785,6 +786,8 @@ class PropertyRestrictions:
                 "-webkit-text-fill-color",
                 "-webkit-text-stroke-color",
                 "vertical-align",
+                # Will become shorthand of vertical-align (Bug 1830771)
+                "baseline-source",
                 "line-height",
                 # Kinda like css-backgrounds?
                 "background-blend-mode",
@@ -818,6 +821,8 @@ class PropertyRestrictions:
                 "-webkit-text-fill-color",
                 "-webkit-text-stroke-color",
                 "vertical-align",
+                # Will become shorthand of vertical-align (Bug 1830771)
+                "baseline-source",
                 "line-height",
                 # Kinda like css-backgrounds?
                 "background-blend-mode",

components/style/properties/longhands/box.mako.rs

@@ -94,6 +94,16 @@ ${helpers.predefined_type(
     servo_restyle_damage = "reflow",
 )}
 
+${helpers.predefined_type(
+    "baseline-source",
+    "BaselineSource",
+    "computed::BaselineSource::Auto",
+    engines="gecko servo-2013",
+    animation_value_type="discrete",
+    spec="https://drafts.csswg.org/css-inline-3/#baseline-source",
+    servo_restyle_damage = "reflow",
+)}
+
 // CSS 2.1, Section 11 - Visual effects
 
 ${helpers.single_keyword(

components/style/values/computed/box.rs

@@ -13,10 +13,10 @@ use crate::values::generics::box_::{
 use crate::values::specified::box_ as specified;
 
 pub use crate::values::specified::box_::{
-    Appearance, BreakBetween, BreakWithin, Clear as SpecifiedClear, Contain, ContainerName,
-    ContainerType, ContentVisibility, Display, Float as SpecifiedFloat, Overflow, OverflowAnchor,
-    OverflowClipBox, OverscrollBehavior, ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop,
-    ScrollSnapStrictness, ScrollSnapType, ScrollbarGutter, TouchAction, WillChange,
+    Appearance, BaselineSource, BreakBetween, BreakWithin, Clear as SpecifiedClear, Contain,
+    ContainerName, ContainerType, ContentVisibility, Display, Float as SpecifiedFloat, Overflow,
+    OverflowAnchor, OverflowClipBox, OverscrollBehavior, ScrollSnapAlign, ScrollSnapAxis,
+    ScrollSnapStop, ScrollSnapStrictness, ScrollSnapType, ScrollbarGutter, TouchAction, WillChange,
 };
 
 /// A computed value for the `vertical-align` property.

components/style/values/computed/mod.rs

@@ -57,7 +57,7 @@ pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, S
 pub use self::box_::{
     ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop, ScrollSnapStrictness, ScrollSnapType,
 };
-pub use self::box_::{TouchAction, VerticalAlign, WillChange};
+pub use self::box_::{BaselineSource, TouchAction, VerticalAlign, WillChange};
 pub use self::color::{
     Color, ColorOrAuto, ColorPropertyValue, ColorScheme, ForcedColorAdjust, PrintColorAdjust,
 };

components/style/values/specified/box.rs

@@ -8,7 +8,7 @@ use crate::parser::{Parse, ParserContext};
 #[cfg(feature = "gecko")]
 use crate::properties::{LonghandId, PropertyDeclarationId, PropertyId};
 use crate::values::generics::box_::{
-    GenericLineClamp, GenericPerspective, GenericContainIntrinsicSize, GenericVerticalAlign,
+    GenericContainIntrinsicSize, GenericLineClamp, GenericPerspective, GenericVerticalAlign,
     VerticalAlignKeyword,
 };
 use crate::values::specified::length::{LengthPercentage, NonNegativeLength};
@@ -606,6 +606,33 @@ impl Parse for VerticalAlign {
     }
 }
 
+/// A specified value for the `baseline-source` property.
+/// https://drafts.csswg.org/css-inline-3/#baseline-source
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    Hash,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToCss,
+    ToShmem,
+    ToComputedValue,
+    ToResolvedValue,
+)]
+#[repr(u8)]
+pub enum BaselineSource {
+    /// `Last` for `inline-block`, `First` otherwise.
+    Auto,
+    /// Use first baseline for alignment.
+    First,
+    /// Use last baseline for alignment.
+    Last,
+}
+
 /// https://drafts.csswg.org/css-scroll-snap-1/#snap-axis
 #[allow(missing_docs)]
 #[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
@@ -1176,7 +1203,20 @@ pub enum ContentVisibility {
     Visible,
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq, MallocSizeOf, SpecifiedValueInfo, ToComputedValue, ToCss, Parse, ToResolvedValue, ToShmem)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    PartialEq,
+    Eq,
+    MallocSizeOf,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    Parse,
+    ToResolvedValue,
+    ToShmem,
+)]
 #[repr(u8)]
 #[allow(missing_docs)]
 /// https://drafts.csswg.org/css-contain-3/#container-type
@@ -1237,8 +1277,7 @@ impl ContainerName {
         if !for_query && first.eq_ignore_ascii_case("none") {
             return Ok(Self::none());
         }
-        const DISALLOWED_CONTAINER_NAMES: &'static [&'static str] =
-            &["none", "not", "or", "and"];
+        const DISALLOWED_CONTAINER_NAMES: &'static [&'static str] = &["none", "not", "or", "and"];
         idents.push(CustomIdent::from_ident(
             location,
             first,

components/style/values/specified/mod.rs

@@ -44,7 +44,7 @@ pub use self::box_::{Contain, Display};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, ScrollbarGutter};
 pub use self::box_::{ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
 pub use self::box_::{ScrollSnapStrictness, ScrollSnapType};
-pub use self::box_::{TouchAction, VerticalAlign, WillChange};
+pub use self::box_::{BaselineSource, TouchAction, VerticalAlign, WillChange};
 pub use self::color::{
     Color, ColorOrAuto, ColorPropertyValue, ColorScheme, ForcedColorAdjust, PrintColorAdjust,
 };