style/values/resolved/
counters.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5//! Resolved values for counter properties
6
7use super::{Context, ToResolvedValue};
8use crate::values::computed;
9#[cfg(feature = "gecko")]
10use selectors::parser::PseudoElement;
11
12/// https://drafts.csswg.org/css-content/#content-property
13///
14/// We implement this at resolved value time because otherwise it causes us to allocate a bunch of
15/// useless initial structs for all ::before / ::after, which is a bit unfortunate.
16///
17/// Though these should be temporary, mostly, so if this causes complexity in
18/// other places, it should be fine to move to `StyleAdjuster`.
19///
20/// See https://github.com/w3c/csswg-drafts/issues/4632 for where some related
21/// issues are being discussed.
22impl ToResolvedValue for computed::Content {
23    type ResolvedValue = Self;
24
25    #[inline]
26    fn to_resolved_value(self, context: &Context) -> Self {
27        let (is_before_or_after, is_marker) = match context.style.pseudo() {
28            Some(ref pseudo) => (pseudo.is_before_or_after(), pseudo.is_marker()),
29            None => (false, false),
30        };
31        match self {
32            Self::Normal if is_before_or_after => Self::None,
33            // For now, make `content: none` resolve to `normal` for pseudos
34            // other than ::before, ::after and ::marker, as we don't respect it.
35            // https://github.com/w3c/csswg-drafts/issues/6124
36            Self::None if !is_before_or_after && !is_marker => Self::Normal,
37            other => other,
38        }
39    }
40
41    #[inline]
42    fn from_resolved_value(resolved: Self) -> Self {
43        resolved
44    }
45}
style/values/resolved/counters.rs

style/values/resolved/
counters.rs
