Use ranges returned by pulldown

Co-authored-by: Joshua Nelson <joshua@yottadb.com>

src/librustdoc/html/markdown.rs

@@ -414,11 +414,13 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for LinkReplacer<'a, I> {
     }
 }
 
+type SpannedEvent<'a> = (Event<'a>, Range<usize>);
+
 /// Make headings links with anchor IDs and build up TOC.
 struct HeadingLinks<'a, 'b, 'ids, I> {
     inner: I,
     toc: Option<&'b mut TocBuilder>,
-    buf: VecDeque<Event<'a>>,
+    buf: VecDeque<SpannedEvent<'a>>,
     id_map: &'ids mut IdMap,
 }
 
@@ -428,8 +430,10 @@ impl<'a, 'b, 'ids, I> HeadingLinks<'a, 'b, 'ids, I> {
     }
 }
 
-impl<'a, 'b, 'ids, I: Iterator<Item = Event<'a>>> Iterator for HeadingLinks<'a, 'b, 'ids, I> {
+impl<'a, 'b, 'ids, I: Iterator<Item = SpannedEvent<'a>>> Iterator
-    type Item = Event<'a>;
+    for HeadingLinks<'a, 'b, 'ids, I>
+{
+    type Item = SpannedEvent<'a>;
 
     fn next(&mut self) -> Option<Self::Item> {
         if let Some(e) = self.buf.pop_front() {
@@ -437,31 +441,29 @@ impl<'a, 'b, 'ids, I: Iterator<Item = Event<'a>>> Iterator for HeadingLinks<'a,
         }
 
         let event = self.inner.next();
-        if let Some(Event::Start(Tag::Heading(level))) = event {
+        if let Some((Event::Start(Tag::Heading(level)), _)) = event {
             let mut id = String::new();
             for event in &mut self.inner {
-                match &event {
+                match &event.0 {
                     Event::End(Tag::Heading(..)) => break,
+                    Event::Start(Tag::Link(_, _, _)) | Event::End(Tag::Link(..)) => {}
                     Event::Text(text) | Event::Code(text) => {
                         id.extend(text.chars().filter_map(slugify));
+                        self.buf.push_back(event);
                     }
-                    _ => {}
+                    _ => self.buf.push_back(event),
-                }
-                match event {
-                    Event::Start(Tag::Link(_, _, _)) | Event::End(Tag::Link(..)) => {}
-                    event => self.buf.push_back(event),
                 }
             }
             let id = self.id_map.derive(id);
 
             if let Some(ref mut builder) = self.toc {
                 let mut html_header = String::new();
-                html::push_html(&mut html_header, self.buf.iter().cloned());
+                html::push_html(&mut html_header, self.buf.iter().map(|(ev, _)| ev.clone()));
                 let sec = builder.push(level as u32, html_header, id.clone());
-                self.buf.push_front(Event::Html(format!("{} ", sec).into()));
+                self.buf.push_front((Event::Html(format!("{} ", sec).into()), 0..0));
             }
 
-            self.buf.push_back(Event::Html(format!("</a></h{}>", level).into()));
+            self.buf.push_back((Event::Html(format!("</a></h{}>", level).into()), 0..0));
 
             let start_tags = format!(
                 "<h{level} id=\"{id}\" class=\"section-header\">\
@@ -469,7 +471,7 @@ impl<'a, 'b, 'ids, I: Iterator<Item = Event<'a>>> Iterator for HeadingLinks<'a,
                 id = id,
                 level = level
             );
-            return Some(Event::Html(start_tags.into()));
+            return Some((Event::Html(start_tags.into()), 0..0));
         }
         event
     }
@@ -560,23 +562,23 @@ impl<'a, I> Footnotes<'a, I> {
     }
 }
 
-impl<'a, I: Iterator<Item = Event<'a>>> Iterator for Footnotes<'a, I> {
+impl<'a, I: Iterator<Item = SpannedEvent<'a>>> Iterator for Footnotes<'a, I> {
-    type Item = Event<'a>;
+    type Item = SpannedEvent<'a>;
 
     fn next(&mut self) -> Option<Self::Item> {
         loop {
             match self.inner.next() {
-                Some(Event::FootnoteReference(ref reference)) => {
+                Some((Event::FootnoteReference(ref reference), range)) => {
                     let entry = self.get_entry(&reference);
                     let reference = format!(
                         "<sup id=\"fnref{0}\"><a href=\"#fn{0}\">{0}</a></sup>",
                         (*entry).1
                     );
-                    return Some(Event::Html(reference.into()));
+                    return Some((Event::Html(reference.into()), range));
                 }
-                Some(Event::Start(Tag::FootnoteDefinition(def))) => {
+                Some((Event::Start(Tag::FootnoteDefinition(def)), _)) => {
                     let mut content = Vec::new();
-                    for event in &mut self.inner {
+                    for (event, _) in &mut self.inner {
                         if let Event::End(Tag::FootnoteDefinition(..)) = event {
                             break;
                         }
@@ -607,7 +609,7 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for Footnotes<'a, I> {
                             ret.push_str("</li>");
                         }
                         ret.push_str("</ol></div>");
-                        return Some(Event::Html(ret.into()));
+                        return Some((Event::Html(ret.into()), 0..0));
                     } else {
                         return None;
                     }
@@ -917,13 +919,14 @@ impl Markdown<'_> {
         };
 
         let p = Parser::new_with_broken_link_callback(md, opts(), Some(&mut replacer));
+        let p = p.into_offset_iter();
 
         let mut s = String::with_capacity(md.len() * 3 / 2);
 
         let p = HeadingLinks::new(p, None, &mut ids);
-        let p = LinkReplacer::new(p, links);
-        let p = CodeBlocks::new(p, codes, edition, playground);
         let p = Footnotes::new(p);
+        let p = LinkReplacer::new(p.map(|(ev, _)| ev), links);
+        let p = CodeBlocks::new(p, codes, edition, playground);
         html::push_html(&mut s, p);
 
         s
@@ -934,7 +937,7 @@ impl MarkdownWithToc<'_> {
     crate fn into_string(self) -> String {
         let MarkdownWithToc(md, mut ids, codes, edition, playground) = self;
 
-        let p = Parser::new_ext(md, opts());
+        let p = Parser::new_ext(md, opts()).into_offset_iter();
 
         let mut s = String::with_capacity(md.len() * 3 / 2);
 
@@ -942,8 +945,8 @@ impl MarkdownWithToc<'_> {
 
         {
             let p = HeadingLinks::new(p, Some(&mut toc), &mut ids);
-            let p = CodeBlocks::new(p, codes, edition, playground);
             let p = Footnotes::new(p);
+            let p = CodeBlocks::new(p.map(|(ev, _)| ev), codes, edition, playground);
             html::push_html(&mut s, p);
         }
 
@@ -959,19 +962,19 @@ impl MarkdownHtml<'_> {
         if md.is_empty() {
             return String::new();
         }
-        let p = Parser::new_ext(md, opts());
+        let p = Parser::new_ext(md, opts()).into_offset_iter();
 
         // Treat inline HTML as plain text.
-        let p = p.map(|event| match event {
+        let p = p.map(|event| match event.0 {
-            Event::Html(text) => Event::Text(text),
+            Event::Html(text) => (Event::Text(text), event.1),
             _ => event,
         });
 
         let mut s = String::with_capacity(md.len() * 3 / 2);
 
         let p = HeadingLinks::new(p, None, &mut ids);
-        let p = CodeBlocks::new(p, codes, edition, playground);
         let p = Footnotes::new(p);
+        let p = CodeBlocks::new(p.map(|(ev, _)| ev), codes, edition, playground);
         html::push_html(&mut s, p);
 
         s
@@ -1153,7 +1156,8 @@ crate fn markdown_links(md: &str) -> Vec<(String, Option<Range<usize>>)> {
             shortcut_links.push((link.reference.to_owned(), locate(link.reference)));
             None
         };
-        let p = Parser::new_with_broken_link_callback(md, opts(), Some(&mut push));
+        let p =
+            Parser::new_with_broken_link_callback(md, opts(), Some(&mut push)).into_offset_iter();
 
         // There's no need to thread an IdMap through to here because
         // the IDs generated aren't going to be emitted anywhere.
@@ -1161,7 +1165,7 @@ crate fn markdown_links(md: &str) -> Vec<(String, Option<Range<usize>>)> {
         let iter = Footnotes::new(HeadingLinks::new(p, None, &mut ids));
 
         for ev in iter {
-            if let Event::Start(Tag::Link(_, dest, _)) = ev {
+            if let Event::Start(Tag::Link(_, dest, _)) = ev.0 {
                 debug!("found link: {}", dest);
                 links.push(match dest {
                     CowStr::Borrowed(s) => (s.to_owned(), locate(s)),