101 lines
3.4 KiB
Rust
101 lines
3.4 KiB
Rust
use pulldown_cmark::{CowStr, Event, Tag};
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use std::collections::VecDeque;
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pub fn new<'a, I: Iterator<Item = Event<'a>>>(iter: I) -> FootnoteDefs<'a, I> {
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FootnoteDefs {
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iter,
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footnote_events: VecDeque::new(),
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has_started_emitting_defs: false,
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}
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}
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pub struct FootnoteDefs<'a, I: Iterator<Item = Event<'a>>> {
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iter: I,
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footnote_events: VecDeque<Event<'a>>,
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has_started_emitting_defs: bool,
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}
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impl<'a, I: Iterator<Item = Event<'a>>> Iterator for FootnoteDefs<'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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match self.iter.next() {
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Some(Event::Start(Tag::FootnoteDefinition(ref id))) => {
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self.footnote_events.push_back(Event::Html(
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format!(
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r#"<div id="{}" class="footnote-item"><span class="footnote-marker">{}.</span>"#,
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id, id
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)
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.into(),
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));
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loop {
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match self.iter.next() {
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Some(Event::End(Tag::FootnoteDefinition(_))) => {
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self.footnote_events.push_back(Event::Html("</div>".into()));
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break;
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}
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Some(e) => {
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self.footnote_events.push_back(e);
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}
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None => {
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break;
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}
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}
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}
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self.next()
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}
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Some(e) => Some(e),
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None => {
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if !self.has_started_emitting_defs && !self.footnote_events.is_empty() {
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self.has_started_emitting_defs = true;
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let before: CowStr<'a> =
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r#"<hr class="footnotes-sep"><section class="footnotes">"#.into();
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self.footnote_events.push_front(Event::Html(before));
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let after: CowStr<'a> = "</section>".into();
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self.footnote_events.push_back(Event::Html(after));
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}
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self.footnote_events.pop_front()
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}
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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_group_footnotes() {
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assert_eq!(
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render("foo[^1]\n\n[^1]: bar\n\nbaz"),
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r##"<p>foo<sup class="footnote-reference"><a href="#1">1</a></sup></p>
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<p>baz</p>
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<hr class="footnotes-sep"><section class="footnotes"><div id="1" class="footnote-item"><span class="footnote-marker">1.</span>
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<p>bar</p>
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</div></section>"##
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);
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}
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#[test]
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fn test_multiple() {
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assert_eq!(
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render("foo[^1] bar[^2]\n\n[^1]: foo\n\n[^2]: bar"),
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r##"<p>foo<sup class="footnote-reference"><a href="#1">1</a></sup> bar<sup class="footnote-reference"><a href="#2">2</a></sup></p>
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<hr class="footnotes-sep"><section class="footnotes"><div id="1" class="footnote-item"><span class="footnote-marker">1.</span>
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<p>foo</p>
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</div><div id="2" class="footnote-item"><span class="footnote-marker">2.</span>
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<p>bar</p>
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</div></section>"##
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);
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}
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}
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