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style: Update the syntax of scroll() to accept <scroller> and <axis> in any order

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The order of <scroller> and <axis> doesn't matter in the parser.
However, we serialize <scroller> first, if it is not the initial value.

Differential Revision: https://phabricator.services.mozilla.com/D173906
This commit is contained in:
Boris Chiou 2023-05-04 21:35:14 +00:00 • committed by Martin Robinson
parent a27f477c7d
commit f96c75c8d0
1 changed files with 21 additions and 7 deletions
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28
components/style/values/specified/animation.rs
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@ -283,12 +283,12 @@ impl Default for ScrollAxis {
#[css(function = "scroll")]
#[repr(C)]
pub struct ScrollFunction {
/// The axis of scrolling that drives the progress of the timeline.
#[css(skip_if = "ScrollAxis::is_default")]
pub axis: ScrollAxis,
/// The scroll container element whose scroll position drives the progress of the timeline.
#[css(skip_if = "Scroller::is_default")]
pub scroller: Scroller,
/// The axis of scrolling that drives the progress of the timeline.
#[css(skip_if = "ScrollAxis::is_default")]
pub axis: ScrollAxis,
}
impl ScrollFunction {
@ -296,11 +296,25 @@ impl ScrollFunction {
fn parse_arguments<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
// <scroll()> = scroll( [ <scroller> || <axis> ]? )
// https://drafts.csswg.org/scroll-animations-1/#funcdef-scroll
//
// FIXME: This doesn't match the spec. I will update it in Bug 1814444.
let mut scroller = None;
let mut axis = None;
loop {
if scroller.is_none() {
scroller = input.try_parse(Scroller::parse).ok();
}
if axis.is_none() {
axis = input.try_parse(ScrollAxis::parse).ok();
if axis.is_some() {
continue;
}
}
break;
}
Ok(Self {
axis: input.try_parse(ScrollAxis::parse).unwrap_or_default(),
scroller: input.try_parse(Scroller::parse).unwrap_or_default(),
scroller: scroller.unwrap_or_default(),
axis: axis.unwrap_or_default(),
})
}
}