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Prevent double allocation due to `Content::sequence` (#5084)

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Laurenz 2024-10-01 12:47:59 +02:00 committed by GitHub
parent 63e6150ca1
commit d03af848eb
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1 changed files with 8 additions and 10 deletions
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18
crates/typst/src/foundations/content.rs
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@ -245,16 +245,14 @@ impl Content {
/// Create a new sequence element from multiples elements.
pub fn sequence(iter: impl IntoIterator<Item = Self>) -> Self {
let mut iter = iter.into_iter();
let Some(first) = iter.next() else { return Self::empty() };
let Some(second) = iter.next() else { return first };
SequenceElem::new(
std::iter::once(first)
.chain(std::iter::once(second))
.chain(iter)
.collect(),
)
.into()
let vec: Vec<_> = iter.into_iter().collect();
if vec.is_empty() {
Self::empty()
} else if vec.len() == 1 {
vec.into_iter().next().unwrap()
} else {
SequenceElem::new(vec).into()
}
}
/// Whether the contained element is of type `T`.