1 files changed, 47 insertions, 0 deletions
diff --git a/servo/components/style/values/generics/url.rs b/servo/components/style/values/generics/url.rs
new file mode 100644
index 0000000000..46ed453e82
--- /dev/null
+++ b/servo/components/style/values/generics/url.rs
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Generic types for url properties.
+
+/// An image url or none, used for example in list-style-image
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    Parse,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C, u8)]
+pub enum GenericUrlOrNone<U> {
+    /// `none`
+    None,
+    /// A URL.
+    Url(U),
+}
+
+pub use self::GenericUrlOrNone as UrlOrNone;
+
+impl<Url> UrlOrNone<Url> {
+    /// Initial "none" value for properties such as `list-style-image`
+    pub fn none() -> Self {
+        UrlOrNone::None
+    }
+
+    /// Returns whether the value is `none`.
+    pub fn is_none(&self) -> bool {
+        match *self {
+            UrlOrNone::None => true,
+            UrlOrNone::Url(..) => false,
+        }
+    }
+}