style: Support image-set in the content property

Differential Revision: https://phabricator.services.mozilla.com/D107397

components/style/values/computed/counters.rs

@@ -4,7 +4,7 @@
 
 //! Computed values for counter properties
 
-use crate::values::computed::url::ComputedImageUrl;
+use crate::values::computed::image::Image;
 use crate::values::generics::counters as generics;
 use crate::values::generics::counters::CounterIncrement as GenericCounterIncrement;
 use crate::values::generics::counters::CounterSetOrReset as GenericCounterSetOrReset;
@@ -16,7 +16,7 @@ pub type CounterIncrement = GenericCounterIncrement<i32>;
 pub type CounterSetOrReset = GenericCounterSetOrReset<i32>;
 
 /// A computed value for the `content` property.
-pub type Content = generics::GenericContent<ComputedImageUrl>;
+pub type Content = generics::GenericContent<Image>;
 
 /// A computed content item.
-pub type ContentItem = generics::GenericContentItem<ComputedImageUrl>;
+pub type ContentItem = generics::GenericContentItem<Image>;

components/style/values/generics/counters.rs

@@ -148,18 +148,18 @@ fn is_decimal(counter_type: &CounterStyleType) -> bool {
     Clone, Debug, Eq, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss, ToShmem,
 )]
 #[repr(u8)]
-pub enum GenericContent<ImageUrl> {
+pub enum GenericContent<Image> {
     /// `normal` reserved keyword.
     Normal,
     /// `none` reserved keyword.
     None,
     /// Content items.
-    Items(#[css(iterable)] crate::OwnedSlice<GenericContentItem<ImageUrl>>),
+    Items(#[css(iterable)] crate::OwnedSlice<GenericContentItem<Image>>),
 }
 
 pub use self::GenericContent as Content;
 
-impl<ImageUrl> Content<ImageUrl> {
+impl<Image> Content<Image> {
     /// Whether `self` represents list of items.
     #[inline]
     pub fn is_items(&self) -> bool {
@@ -180,14 +180,13 @@ impl<ImageUrl> Content<ImageUrl> {
     Eq,
     MallocSizeOf,
     PartialEq,
-    SpecifiedValueInfo,
     ToComputedValue,
     ToCss,
     ToResolvedValue,
     ToShmem,
 )]
 #[repr(u8)]
-pub enum GenericContentItem<ImageUrl> {
+pub enum GenericContentItem<I> {
     /// Literal string content.
     String(crate::OwnedStr),
     /// `counter(name, style)`.
@@ -220,8 +219,8 @@ pub enum GenericContentItem<ImageUrl> {
     /// `attr([namespace? `|`]? ident)`
     #[cfg(any(feature = "gecko", feature = "servo-layout-2020"))]
     Attr(Attr),
-    /// `url(url)`
+    /// image-set(url) | url(url)
-    Url(ImageUrl),
+    Image(I),
 }
 
 pub use self::GenericContentItem as ContentItem;

components/style/values/specified/counters.rs

@@ -11,7 +11,7 @@ use crate::values::generics::counters as generics;
 use crate::values::generics::counters::CounterPair;
 #[cfg(feature = "gecko")]
 use crate::values::generics::CounterStyle;
-use crate::values::specified::url::SpecifiedImageUrl;
+use crate::values::specified::image::Image;
 #[cfg(any(feature = "gecko", feature = "servo-layout-2020"))]
 use crate::values::specified::Attr;
 use crate::values::specified::Integer;
@@ -19,7 +19,7 @@ use crate::values::CustomIdent;
 use cssparser::{Parser, Token};
 #[cfg(any(feature = "gecko", feature = "servo-layout-2013"))]
 use selectors::parser::SelectorParseErrorKind;
-use style_traits::{ParseError, StyleParseErrorKind};
+use style_traits::{KeywordsCollectFn, ParseError, SpecifiedValueInfo, StyleParseErrorKind};
 
 /// A specified value for the `counter-increment` property.
 pub type CounterIncrement = generics::GenericCounterIncrement<Integer>;
@@ -83,10 +83,10 @@ fn parse_counters<'i, 't>(
 }
 
 /// The specified value for the `content` property.
-pub type Content = generics::GenericContent<SpecifiedImageUrl>;
+pub type Content = generics::GenericContent<Image>;
 
 /// The specified value for a content item in the `content` property.
-pub type ContentItem = generics::GenericContentItem<SpecifiedImageUrl>;
+pub type ContentItem = generics::GenericContentItem<Image>;
 
 impl Content {
     #[cfg(feature = "servo-layout-2013")]
@@ -137,8 +137,8 @@ impl Parse for Content {
         loop {
             #[cfg(any(feature = "gecko", feature = "servo-layout-2020"))]
             {
-                if let Ok(url) = input.try_parse(|i| SpecifiedImageUrl::parse(context, i)) {
+                if let Ok(image) = input.try_parse(|i| Image::parse_only_url(context, i)) {
-                    content.push(generics::ContentItem::Url(url));
+                    content.push(generics::ContentItem::Image(image));
                     continue;
                 }
             }
@@ -214,3 +214,20 @@ impl Parse for Content {
         Ok(generics::Content::Items(content.into()))
     }
 }
+
+impl<Image> SpecifiedValueInfo for generics::GenericContentItem<Image> {
+    fn collect_completion_keywords(f: KeywordsCollectFn) {
+        f(&[
+            "url",
+            "image-set",
+            "counter",
+            "counters",
+            "attr",
+            "open-quote",
+            "close-quote",
+            "no-open-quote",
+            "no-close-quote",
+            "-moz-alt-content",
+        ]);
+    }
+}