74 lines
2.3 KiB
Rust
74 lines
2.3 KiB
Rust
use pulldown_cmark::{CowStr, Event, Tag};
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use std::iter::Peekable;
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pub struct FootnoteBackrefs<'a, I: Iterator<Item = Event<'a>>> {
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iter: Peekable<I>,
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next: Option<Event<'a>>,
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}
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pub fn new<'a, I: Iterator<Item = Event<'a>>>(iter: I) -> FootnoteBackrefs<'a, I> {
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FootnoteBackrefs {
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iter: iter.peekable(),
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next: None,
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}
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}
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impl<'a, I: Iterator<Item = Event<'a>>> Iterator for FootnoteBackrefs<'a, I> {
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type Item = Event<'a>;
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fn next(&mut self) -> Option<Self::Item> {
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if let Some(e) = self.next.take() {
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return Some(e);
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}
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match self.iter.next() {
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Some(Event::FootnoteReference(label)) => {
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let html = format!(
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r##"<sup class="footnote-reference" id="fnref{}"><a href="#{}">[{}]</a></sup>"##,
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label, label, label
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);
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Some(Event::Html(CowStr::Boxed(html.into_boxed_str())))
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}
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Some(Event::End(Tag::Paragraph)) => {
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if let Some(Event::End(Tag::FootnoteDefinition(label))) = self.iter.peek() {
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assert!(self.next.is_none());
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self.next = Some(Event::End(Tag::Paragraph));
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let html = format!(
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r##" <a href="#fnref{}" class="footnote-backref">↩</a>"##,
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label
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);
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Some(Event::Html(CowStr::Boxed(html.into_boxed_str())))
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} else {
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Some(Event::End(Tag::Paragraph))
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}
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}
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e => e,
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use pulldown_cmark::{html, Options, Parser};
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fn render(s: &str) -> String {
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let mut out = String::new();
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let parser = Parser::new_ext(s, Options::ENABLE_FOOTNOTES);
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let footnote_backrefs = super::new(parser);
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html::push_html(&mut out, footnote_backrefs);
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out
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}
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#[test]
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fn test_footnote_backrefs() {
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assert_eq!(
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render("foo[^1]\n\n[^1]: bar"),
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r##"<p>foo<sup class="footnote-reference" id="fnref1"><a href="#1">[1]</a></sup></p>
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<div class="footnote-definition" id="1"><sup class="footnote-definition-label">1</sup>
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<p>bar <a href="#fnref1" class="footnote-backref">↩</a></p>
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</div>
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"##
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);
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}
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}
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