1 files changed, 101 insertions, 0 deletions
diff --git a/servo/components/style/values/generics/size.rs b/servo/components/style/values/generics/size.rs
new file mode 100644
index 0000000000..979b8f9322
--- /dev/null
+++ b/servo/components/style/values/generics/size.rs
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+/* 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 type for CSS properties that are composed by two dimensions.
+
+use crate::parser::ParserContext;
+use crate::Zero;
+use cssparser::Parser;
+use std::fmt::{self, Write};
+use style_traits::{CssWriter, ParseError, ToCss};
+
+/// A generic size, for `border-*-radius` longhand properties, or
+/// `border-spacing`.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    Deserialize,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    Serialize,
+    ToAnimatedZero,
+    ToAnimatedValue,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[allow(missing_docs)]
+#[repr(C)]
+pub struct Size2D<L> {
+    pub width: L,
+    pub height: L,
+}
+
+impl<L> Size2D<L> {
+    #[inline]
+    /// Create a new `Size2D` for an area of given width and height.
+    pub fn new(width: L, height: L) -> Self {
+        Self { width, height }
+    }
+
+    /// Returns the width component.
+    pub fn width(&self) -> &L {
+        &self.width
+    }
+
+    /// Returns the height component.
+    pub fn height(&self) -> &L {
+        &self.height
+    }
+
+    /// Parse a `Size2D` with a given parsing function.
+    pub fn parse_with<'i, 't, F>(
+        context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+        parse_one: F,
+    ) -> Result<Self, ParseError<'i>>
+    where
+        L: Clone,
+        F: Fn(&ParserContext, &mut Parser<'i, 't>) -> Result<L, ParseError<'i>>,
+    {
+        let first = parse_one(context, input)?;
+        let second = input
+            .try_parse(|i| parse_one(context, i))
+            .unwrap_or_else(|_| first.clone());
+        Ok(Self::new(first, second))
+    }
+}
+
+impl<L> ToCss for Size2D<L>
+where
+    L: ToCss + PartialEq,
+{
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        self.width.to_css(dest)?;
+
+        if self.height != self.width {
+            dest.write_char(' ')?;
+            self.height.to_css(dest)?;
+        }
+
+        Ok(())
+    }
+}
+
+impl<L: Zero> Zero for Size2D<L> {
+    fn zero() -> Self {
+        Self::new(L::zero(), L::zero())
+    }
+
+    fn is_zero(&self) -> bool {
+        self.width.is_zero() && self.height.is_zero()
+    }
+}