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
10/// https://drafts.csswg.org/css-content/#content-property
11///
12/// We implement this at resolved value time because otherwise it causes us to
13/// allocate a bunch of useless initial structs for ::before / ::after, which is
14/// a bit unfortunate.
15///
16/// Though these should be temporary, mostly, so if this causes complexity in
17/// other places, it should be fine to move to `StyleAdjuster`.
18///
19/// See https://github.com/w3c/csswg-drafts/issues/4632 for where some related
20/// issues are being discussed.
21impl ToResolvedValue for computed::Content {
22    type ResolvedValue = Self;
23
24    #[inline]
25    fn to_resolved_value(self, context: &Context) -> Self {
26        let (is_pseudo, is_before_or_after, is_marker) = match context.style.pseudo() {
27            Some(ref pseudo) => (true, pseudo.is_before_or_after(), pseudo.is_marker()),
28            None => (false, false, false),
29        };
30        match self {
31            Self::Normal if is_before_or_after => Self::None,
32            // For now, make `content: none` compute to `normal` for pseudos
33            // other than ::before, ::after and ::marker, as we don't respect it.
34            // https://github.com/w3c/csswg-drafts/issues/6124
35            // Ditto for non-pseudo elements if the pref is disabled.
36            Self::None
37                if (is_pseudo && !is_before_or_after && !is_marker) ||
38                    (!is_pseudo &&
39                        !static_prefs::pref!("layout.css.element-content-none.enabled")) =>
40            {
41                Self::Normal
42            },
43            other => other,
44        }
45    }
46
47    #[inline]
48    fn from_resolved_value(resolved: Self) -> Self {
49        resolved
50    }
51}
style/values/resolved/counters.rs

style/values/resolved/
counters.rs
