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prepass: avoid peekable for block iter

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This commit is contained in:
Noah Hellman 2023-06-14 20:04:31 +02:00
parent 5ddbd728a8
commit 253d1d2d4b
1 changed files with 27 additions and 20 deletions
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47
src/lib.rs
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@ -598,49 +598,56 @@ impl<'s> PrePass<'s> {
#[must_use]
fn new(
src: &'s str,
blocks: std::slice::Iter<block::Event<'s>>,
mut blocks: std::slice::Iter<block::Event<'s>>,
inline_parser: &mut inline::Parser<'s>,
) -> Self {
let mut link_definitions = Map::new();
let mut headings: Vec<Heading> = Vec::new();
let mut used_ids: Set<String> = Set::new();
let mut blocks = blocks.peekable();
let mut attr_prev: Option<Range<usize>> = None;
while let Some(e) = blocks.next() {
match e.kind {
block::EventKind::Enter(block::Node::Leaf(block::Leaf::LinkDefinition {
label,
})) => {
fn next_is_inline(
bs: &mut std::iter::Peekable<std::slice::Iter<block::Event>>,
) -> bool {
matches!(bs.peek().map(|e| &e.kind), Some(block::EventKind::Inline))
}
// All link definition tags have to be obtained initially, as references can
// appear before the definition.
let attrs = attr_prev
.as_ref()
.map_or_else(Attributes::new, |sp| attr::parse(&src[sp.clone()]));
let url = if !next_is_inline(&mut blocks) {
"".into()
} else {
let start = src[blocks.next().as_ref().unwrap().span.clone()]
.trim_matches(|c: char| c.is_ascii_whitespace());
if !next_is_inline(&mut blocks) {
start.into()
} else {
let url = if let Some(block::Event {
kind: block::EventKind::Inline,
span,
}) = blocks.next()
{
let start =
src[span.clone()].trim_matches(|c: char| c.is_ascii_whitespace());
if let Some(block::Event {
kind: block::EventKind::Inline,
span,
}) = blocks.next()
{
let mut url = start.to_string();
while next_is_inline(&mut blocks) {
url.push_str(
src[span.clone()].trim_matches(|c: char| c.is_ascii_whitespace()),
);
while let Some(block::Event {
kind: block::EventKind::Inline,
span,
}) = blocks.next()
{
url.push_str(
src[blocks.next().as_ref().unwrap().span.clone()]
src[span.clone()]
.trim_matches(|c: char| c.is_ascii_whitespace()),
);
}
url.into()
url.into() // owned
} else {
start.into() // borrowed
}
} else {
"".into() // static
};
link_definitions.insert(label, (url, attrs));
}