Use generics for scroll-snap-points-*

components/style/values/specified/gecko.rs

@@ -0,0 +1,26 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+//! Specified types for legacy Gecko-only properties.
+
+use cssparser::Parser;
+use parser::{Parse, ParserContext};
+use values::generics::gecko::ScrollSnapPoint as GenericScrollSnapPoint;
+use values::specified::length::LengthOrPercentage;
+
+/// A specified type for scroll snap points.
+pub type ScrollSnapPoint = GenericScrollSnapPoint<LengthOrPercentage>;
+
+impl Parse for ScrollSnapPoint {
+    fn parse(context: &ParserContext, input: &mut Parser) -> Result<Self, ()> {
+        if input.try(|i| i.expect_ident_matching("none")).is_ok() {
+            return Ok(GenericScrollSnapPoint::None);
+        }
+        input.expect_function_matching("repeat")?;
+        let length = input.parse_nested_block(|i| {
+            LengthOrPercentage::parse_non_negative(context, i)
+        })?;
+        Ok(GenericScrollSnapPoint::Repeat(length))
+    }
+}