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7fe7b2ffb1
Most of types just derive it using proc_macro directly. Some of value types need manual impl. In my current plan, this new trait will be used in bug 1434130 to expose values as well. Bug: 1455576 Reviewed-by: emilio MozReview-Commit-ID: LI7fy45VkRw
43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Generic types for url properties.
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use cssparser::Parser;
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use parser::{Parse, ParserContext};
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use style_traits::ParseError;
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/// An image url or none, used for example in list-style-image
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#[derive(Animate, Clone, ComputeSquaredDistance, Debug, MallocSizeOf, PartialEq,
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SpecifiedValueInfo, ToAnimatedValue, ToAnimatedZero, ToComputedValue,
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ToCss)]
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pub enum UrlOrNone<Url> {
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/// `none`
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None,
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/// `A URL`
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Url(Url),
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}
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impl<Url> UrlOrNone<Url> {
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/// Initial "none" value for properties such as `list-style-image`
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pub fn none() -> Self {
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UrlOrNone::None
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}
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}
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impl<Url> Parse for UrlOrNone<Url>
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where
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Url: Parse,
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{
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<UrlOrNone<Url>, ParseError<'i>> {
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if let Ok(url) = input.try(|input| Url::parse(context, input)) {
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return Ok(UrlOrNone::Url(url));
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}
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input.expect_ident_matching("none")?;
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Ok(UrlOrNone::None)
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}
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}
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