Move TransformStyle out of Mako files

components/style/properties/gecko.mako.rs

@@ -62,6 +62,7 @@ use values::computed::{NonNegativeLength, ToComputedValue, Percentage};
 use values::computed::font::{FontSize, SingleFontFamily};
 use values::computed::effects::{BoxShadow, Filter, SimpleShadow};
 use values::computed::outline::OutlineStyle;
+use values::generics::transform::TransformStyle;
 use computed_values::border_style;
 
 pub mod style_structs {
@@ -3345,6 +3346,25 @@ fn static_assert() {
         self.copy_transition_property_from(other)
     }
 
+    // Hand-written because the Mako helpers transform `Preserve3d` into `PRESERVE3D`.
+    pub fn set_transform_style(&mut self, v: TransformStyle) {
+        self.gecko.mTransformStyle = match v {
+            TransformStyle::Flat => structs::NS_STYLE_TRANSFORM_STYLE_FLAT as u8,
+            TransformStyle::Preserve3d => structs::NS_STYLE_TRANSFORM_STYLE_PRESERVE_3D as u8,
+        };
+    }
+
+    // Hand-written because the Mako helpers transform `Preserve3d` into `PRESERVE3D`.
+    pub fn clone_transform_style(&self) -> TransformStyle {
+        match self.gecko.mTransformStyle as u32 {
+            structs::NS_STYLE_TRANSFORM_STYLE_FLAT => TransformStyle::Flat,
+            structs::NS_STYLE_TRANSFORM_STYLE_PRESERVE_3D => TransformStyle::Preserve3d,
+            _ => panic!("illegal transform style"),
+        }
+    }
+
+    ${impl_simple_copy('transform_style', 'mTransformStyle')}
+
     ${impl_transition_count('property', 'Property')}
 
     pub fn animations_equals(&self, other: &Self) -> bool {

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

@@ -526,14 +526,16 @@ ${helpers.single_keyword("transform-box",
                          gecko_inexhaustive="True",
                          animation_value_type="discrete")}
 
-// `auto` keyword is not supported in gecko yet.
-${helpers.single_keyword("transform-style",
-                         "auto flat preserve-3d" if product == "servo" else
-                         "flat preserve-3d",
-                         spec="https://drafts.csswg.org/css-transforms/#transform-style-property",
-                         extra_prefixes="moz webkit",
-                         flags="CREATES_STACKING_CONTEXT FIXPOS_CB",
-                         animation_value_type="discrete")}
+${helpers.predefined_type(
+    "transform-style",
+    "TransformStyle",
+    "computed::TransformStyle::" + ("Auto" if product == "servo" else "Flat"),
+    spec="https://drafts.csswg.org/css-transforms-2/#transform-style-property",
+    needs_context=False,
+    extra_prefixes="moz webkit",
+    flags="CREATES_STACKING_CONTEXT FIXPOS_CB",
+    animation_value_type="discrete",
+)}
 
 ${helpers.predefined_type("transform-origin",
                           "TransformOrigin",

components/style/values/computed/mod.rs

@@ -73,7 +73,8 @@ pub use self::svg::MozContextProperties;
 pub use self::table::XSpan;
 pub use self::text::{InitialLetter, LetterSpacing, LineHeight, TextAlign, TextOverflow, WordSpacing};
 pub use self::time::Time;
-pub use self::transform::{TimingFunction, Transform, TransformOperation, TransformOrigin, Rotate, Translate, Scale};
+pub use self::transform::{Rotate, Scale, TimingFunction, Transform, TransformOperation};
+pub use self::transform::{TransformOrigin, TransformStyle, Translate};
 pub use self::ui::MozForceBrokenImageIcon;
 
 #[cfg(feature = "gecko")]

components/style/values/computed/transform.rs

@@ -18,6 +18,8 @@ use values::generics::transform::TimingFunction as GenericTimingFunction;
 use values::generics::transform::TransformOrigin as GenericTransformOrigin;
 use values::generics::transform::Translate as GenericTranslate;
 
+pub use values::generics::transform::TransformStyle;
+
 /// A single operation in a computed CSS `transform`
 pub type TransformOperation = GenericTransformOperation<
     Angle,

components/style/values/generics/transform.rs

@@ -714,3 +714,13 @@ pub enum Translate<LengthOrPercentage, Length> {
     /// '<length-percentage> <length-percentage> <length>'
     Translate3D(LengthOrPercentage, LengthOrPercentage, Length),
 }
+
+#[allow(missing_docs)]
+#[derive(Clone, Copy, Debug, MallocSizeOf, Parse, PartialEq, ToComputedValue, ToCss)]
+pub enum TransformStyle {
+    #[cfg(feature = "servo")]
+    Auto,
+    Flat,
+    #[css(keyword = "preserve-3d")]
+    Preserve3d,
+}

components/style/values/specified/mod.rs

@@ -69,7 +69,8 @@ pub use self::table::XSpan;
 pub use self::text::{InitialLetter, LetterSpacing, LineHeight, TextDecorationLine};
 pub use self::text::{TextAlign, TextAlignKeyword, TextOverflow, WordSpacing};
 pub use self::time::Time;
-pub use self::transform::{TimingFunction, Transform, TransformOrigin, Rotate, Translate, Scale};
+pub use self::transform::{Rotate, Scale, TimingFunction, Transform};
+pub use self::transform::{TransformOrigin, TransformStyle, Translate};
 pub use self::ui::MozForceBrokenImageIcon;
 pub use super::generics::grid::GridTemplateComponent as GenericGridTemplateComponent;
 

components/style/values/specified/transform.rs

@@ -22,6 +22,8 @@ use values::specified::{self, Angle, Number, Length, Integer};
 use values::specified::{LengthOrNumber, LengthOrPercentage, LengthOrPercentageOrNumber};
 use values::specified::position::{Side, X, Y};
 
+pub use values::generics::transform::TransformStyle;
+
 /// A single operation in a specified CSS `transform`
 pub type TransformOperation = GenericTransformOperation<
     Angle,

components/style_derive/parse.rs

@@ -21,7 +21,9 @@ pub fn derive(input: DeriveInput) -> Tokens {
         );
 
         let variant_attrs = cg::parse_variant_attrs::<CssVariantAttrs>(variant);
-        let identifier = cg::to_css_identifier(variant.ident.as_ref());
+        let identifier = cg::to_css_identifier(
+            &variant_attrs.keyword.as_ref().unwrap_or(&variant.ident).as_ref(),
+        );
         let ident = &variant.ident;
 
         match_body = quote! {

components/style_derive/to_css.rs

@@ -23,10 +23,19 @@ pub fn derive(input: DeriveInput) -> Tokens {
 
         if variant_attrs.dimension {
             assert_eq!(bindings.len(), 1);
-            assert!(variant_attrs.function.is_none(), "That makes no sense");
+            assert!(
+                variant_attrs.function.is_none() && variant_attrs.keyword.is_none(),
+                "That makes no sense"
+            );
         }
 
-        let mut expr = if !bindings.is_empty() {
+        let mut expr = if let Some(keyword) = variant_attrs.keyword {
+            assert!(bindings.is_empty());
+            let keyword = keyword.to_string();
+            quote! {
+                ::std::fmt::Write::write_str(dest, #keyword)
+            }
+        } else if !bindings.is_empty() {
             let mut expr = quote! {};
             if variant_attrs.iterable {
                 assert_eq!(bindings.len(), 1);
@@ -128,6 +137,7 @@ pub struct CssVariantAttrs {
     pub iterable: bool,
     pub comma: bool,
     pub dimension: bool,
+    pub keyword: Option<Ident>,
     pub aliases: Option<String>,
 }