diff options
Diffstat (limited to 'servo/components/style/values/generics/ratio.rs')
-rw-r--r-- | servo/components/style/values/generics/ratio.rs | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/servo/components/style/values/generics/ratio.rs b/servo/components/style/values/generics/ratio.rs new file mode 100644 index 0000000000..8c66fed602 --- /dev/null +++ b/servo/components/style/values/generics/ratio.rs @@ -0,0 +1,50 @@ +/* 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 CSS values related to <ratio>. +//! https://drafts.csswg.org/css-values/#ratios + +use std::fmt::{self, Write}; +use style_traits::{CssWriter, ToCss}; + +/// A generic value for the `<ratio>` value. +#[derive( + Clone, + Copy, + Debug, + MallocSizeOf, + PartialEq, + SpecifiedValueInfo, + ToComputedValue, + ToResolvedValue, + ToShmem, +)] +#[repr(C)] +pub struct Ratio<N>(pub N, pub N); + +impl<N> ToCss for Ratio<N> +where + N: ToCss, +{ + fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result + where + W: Write, + { + self.0.to_css(dest)?; + // Even though 1 could be omitted, we don't per + // https://drafts.csswg.org/css-values-4/#ratio-value: + // + // The second <number> is optional, defaulting to 1. However, + // <ratio> is always serialized with both components. + // + // And for compat reasons, see bug 1669742. + // + // We serialize with spaces for consistency with all other + // slash-delimited things, see + // https://github.com/w3c/csswg-drafts/issues/4282 + dest.write_str(" / ")?; + self.1.to_css(dest)?; + Ok(()) + } +} |