Auto-generate code for grid-template-{rows,columns}

components/style/properties/longhand/position.mako.rs

@@ -319,6 +319,17 @@ ${helpers.predefined_type("object-position",
                               spec="https://drafts.csswg.org/css-grid/#propdef-grid-auto-%ss" % kind,
                               products="gecko",
                               boxed=True)}
+
+    // NOTE: The spec lists only `none | <track-list> | <auto-track-list>`, but gecko seems to support
+    // `subgrid <line-name-list>?` in addition to this (probably old spec). We should support it soon.
+    ${helpers.predefined_type("grid-template-%ss" % kind,
+                              "TrackListOrNone",
+                              "Either::Second(None_)",
+                              products="none",
+                              spec="https://drafts.csswg.org/css-grid/#propdef-grid-template-%ss" % kind,
+                              boxed=True,
+                              animation_value_type="none")}
+
 % endfor
 
 <%helpers:longhand name="grid-auto-flow"

components/style/values/computed/mod.rs

@@ -19,6 +19,7 @@ use super::{CSSFloat, CSSInteger, RGBA};
 use super::generics::BorderRadiusSize as GenericBorderRadiusSize;
 use super::specified;
 use super::specified::grid::{TrackBreadth as GenericTrackBreadth, TrackSize as GenericTrackSize};
+use super::specified::grid::TrackList as GenericTrackList;
 
 pub use app_units::Au;
 pub use cssparser::Color as CSSColor;
@@ -595,6 +596,13 @@ pub type TrackBreadth = GenericTrackBreadth<LengthOrPercentage>;
 /// The computed value of a grid `<track-size>`
 pub type TrackSize = GenericTrackSize<LengthOrPercentage>;
 
+/// The computed value of a grid `<track-list>`
+/// (could also be `<auto-track-list>` or `<explicit-track-list>`)
+pub type TrackList = GenericTrackList<TrackSize>;
+
+/// `<track-list> | none`
+pub type TrackListOrNone = Either<TrackList, None_>;
+
 impl ClipRectOrAuto {
     /// Return an auto (default for clip-rect and image-region) value
     pub fn auto() -> Self {

components/style/values/specified/mod.rs

@@ -13,6 +13,7 @@ use euclid::size::Size2D;
 use itoa;
 use parser::{ParserContext, Parse};
 use self::grid::{TrackBreadth as GenericTrackBreadth, TrackSize as GenericTrackSize};
+use self::grid::{TrackList as GenericTrackList, TrackSizeOrRepeat};
 use self::url::SpecifiedUrl;
 use std::ascii::AsciiExt;
 use std::f32;
@@ -942,6 +943,13 @@ pub type TrackBreadth = GenericTrackBreadth<LengthOrPercentage>;
 /// The specified value of a grid `<track-size>`
 pub type TrackSize = GenericTrackSize<LengthOrPercentage>;
 
+/// The specified value of a grid `<track-list>`
+/// (could also be `<auto-track-list>` or `<explicit-track-list>`)
+pub type TrackList = GenericTrackList<TrackSizeOrRepeat>;
+
+/// `<track-list> | none`
+pub type TrackListOrNone = Either<TrackList, None_>;
+
 #[derive(Debug, Clone, PartialEq)]
 #[cfg_attr(feature = "servo", derive(HeapSizeOf))]
 #[allow(missing_docs)]