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layout: Simplify Contents a little (#32487)

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Instead of duplicating some of `NonReplacedContents` in `Contents`,
divide it into either replaced and non-replaced content, since this is
how the layout system processes `Contents` always. In addition, stop
using `TryInto` to match replaced or non-replaced contents, as it is
quite confusing to handle an `Err` as a success case.
This commit is contained in:
Martin Robinson 2024-06-21 12:13:31 +02:00 • committed by GitHub
parent 44064b1439
commit 66edef8065
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GPG key ID: B5690EEEBB952194
4 changed files with 34 additions and 41 deletions
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51
components/layout_2020/dom_traversal.rs
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@ -122,20 +122,19 @@ where
#[derive(Debug)]
pub(super) enum Contents {
/// Refers to a DOM subtree, plus `::before` and `::after` pseudo-elements.
OfElement,
/// Any kind of content that is not replaced, including the contents of pseudo-elements.
NonReplaced(NonReplacedContents),
/// Example: an `<img src=…>` element.
/// <https://drafts.csswg.org/css2/conform.html#replaced-element>
Replaced(ReplacedContent),
/// Content of a `::before` or `::after` pseudo-element that is being generated.
/// <https://drafts.csswg.org/css2/generate.html#content>
OfPseudoElement(Vec<PseudoElementContentItem>),
}
#[derive(Debug)]
pub(super) enum NonReplacedContents {
/// Refers to a DOM subtree, plus `::before` and `::after` pseudo-elements.
OfElement,
/// Content of a `::before` or `::after` pseudo-element that is being generated.
/// <https://drafts.csswg.org/css2/generate.html#content>
OfPseudoElement(Vec<PseudoElementContentItem>),
}
@ -221,7 +220,8 @@ fn traverse_element<'dom, Node>(
}
},
Display::GeneratingBox(display) => {
let contents = replaced.map_or(Contents::OfElement, Contents::Replaced);
let contents =
replaced.map_or(NonReplacedContents::OfElement.into(), Contents::Replaced);
let display = display.used_value_for_contents(&contents);
let box_slot = element.element_box_slot();
let info = NodeAndStyleInfo::new(element, style);
@ -251,7 +251,7 @@ fn traverse_pseudo_element<'dom, Node>(
Display::GeneratingBox(display) => {
let items = generate_pseudo_element_content(&info.style, element, context);
let box_slot = element.pseudo_element_box_slot(which);
let contents = Contents::OfPseudoElement(items);
let contents = NonReplacedContents::OfPseudoElement(items).into();
handler.handle_element(&info, display, contents, box_slot);
},
}
@ -310,30 +310,25 @@ fn traverse_pseudo_element_contents<'dom, Node>(
impl Contents {
/// Returns true iff the `try_from` impl below would return `Err(_)`
pub fn is_replaced(&self) -> bool {
match self {
Contents::OfElement | Contents::OfPseudoElement(_) => false,
Contents::Replaced(_) => true,
}
}
}
impl std::convert::TryFrom<Contents> for NonReplacedContents {
type Error = ReplacedContent;
fn try_from(contents: Contents) -> Result<Self, Self::Error> {
match contents {
Contents::OfElement => Ok(NonReplacedContents::OfElement),
Contents::OfPseudoElement(items) => Ok(NonReplacedContents::OfPseudoElement(items)),
Contents::Replaced(replaced) => Err(replaced),
}
matches!(self, Contents::Replaced(_))
}
}
impl From<NonReplacedContents> for Contents {
fn from(contents: NonReplacedContents) -> Self {
fn from(non_replaced_contents: NonReplacedContents) -> Self {
Contents::NonReplaced(non_replaced_contents)
}
}
impl std::convert::TryFrom<Contents> for NonReplacedContents {
type Error = &'static str;
fn try_from(contents: Contents) -> Result<Self, Self::Error> {
match contents {
NonReplacedContents::OfElement => Contents::OfElement,
NonReplacedContents::OfPseudoElement(items) => Contents::OfPseudoElement(items),
Contents::NonReplaced(non_replaced_contents) => Ok(non_replaced_contents),
Contents::Replaced(_) => {
Err("Tried to covnert a `Contents::Replaced` into `NonReplacedContent`")
},
}
}
}