Turn markdown_split_summary_and_content into a method of Markdown

Author: GuillaumeGomez

src/librustdoc/html/markdown.rs

@@ -1348,6 +1348,55 @@ impl<'a> Markdown<'a> {
             CodeBlocks::new(p, codes, edition, playground)
         })
     }
+
+    /// Convert markdown to (summary, remaining) HTML.
+    ///
+    /// - The summary is the first top-level Markdown element (usually a paragraph, but potentially
+    ///   any block).
+    /// - The remaining docs contain everything after the summary.
+    pub(crate) fn split_summary_and_content(self) -> (Option<String>, Option<String>) {
+        if self.content.is_empty() {
+            return (None, None);
+        }
+        let mut p = self.into_iter();
+
+        let mut event_level = 0;
+        let mut summary_events = Vec::new();
+        let mut get_next_tag = false;
+
+        let mut end_of_summary = false;
+        while let Some(event) = p.next() {
+            match event {
+                Event::Start(_) => event_level += 1,
+                Event::End(kind) => {
+                    event_level -= 1;
+                    if event_level == 0 {
+                        // We're back at the "top" so it means we're done with the summary.
+                        end_of_summary = true;
+                        // We surround tables with `<div>` HTML tags so this is a special case.
+                        get_next_tag = kind == TagEnd::Table;
+                    }
+                }
+                _ => {}
+            }
+            summary_events.push(event);
+            if end_of_summary {
+                if get_next_tag && let Some(event) = p.next() {
+                    summary_events.push(event);
+                }
+                break;
+            }
+        }
+        let mut summary = String::new();
+        html::push_html(&mut summary, summary_events.into_iter());
+        if summary.is_empty() {
+            return (None, None);
+        }
+        let mut content = String::new();
+        html::push_html(&mut content, p);
+
+        if content.is_empty() { (Some(summary), None) } else { (Some(summary), Some(content)) }
+    }
 }
 
 impl MarkdownWithToc<'_> {
@@ -1421,52 +1470,6 @@ impl MarkdownItemInfo<'_> {
     }
 }
 
-pub(crate) fn markdown_split_summary_and_content(
-    md: Markdown<'_>,
-) -> (Option<String>, Option<String>) {
-    if md.content.is_empty() {
-        return (None, None);
-    }
-    let mut p = md.into_iter();
-
-    let mut event_level = 0;
-    let mut summary_events = Vec::new();
-    let mut get_next_tag = false;
-
-    let mut end_of_summary = false;
-    while let Some(event) = p.next() {
-        match event {
-            Event::Start(_) => event_level += 1,
-            Event::End(kind) => {
-                event_level -= 1;
-                if event_level == 0 {
-                    // We're back at the "top" so it means we're done with the summary.
-                    end_of_summary = true;
-                    // We surround tables with `<div>` HTML tags so this is a special case.
-                    get_next_tag = kind == TagEnd::Table;
-                }
-            }
-            _ => {}
-        }
-        summary_events.push(event);
-        if end_of_summary {
-            if get_next_tag && let Some(event) = p.next() {
-                summary_events.push(event);
-            }
-            break;
-        }
-    }
-    let mut summary = String::new();
-    html::push_html(&mut summary, summary_events.into_iter());
-    if summary.is_empty() {
-        return (None, None);
-    }
-    let mut content = String::new();
-    html::push_html(&mut content, p);
-
-    if content.is_empty() { (Some(summary), None) } else { (Some(summary), Some(content)) }
-}
-
 impl MarkdownSummaryLine<'_> {
     pub(crate) fn into_string_with_has_more_content(self) -> (String, bool) {
         let MarkdownSummaryLine(md, links) = self;

src/librustdoc/html/render/mod.rs

@@ -75,7 +75,6 @@ use crate::html::format::{
 };
 use crate::html::markdown::{
     HeadingOffset, IdMap, Markdown, MarkdownItemInfo, MarkdownSummaryLine,
-    markdown_split_summary_and_content,
 };
 use crate::html::static_files::SCRAPE_EXAMPLES_HELP_MD;
 use crate::html::{highlight, sources};
@@ -1944,15 +1943,16 @@ fn render_impl(
             .impl_item
             .opt_doc_value()
             .map(|dox| {
-                markdown_split_summary_and_content(Markdown {
+                Markdown {
                     content: &*dox,
                     links: &i.impl_item.links(cx),
                     ids: &mut cx.id_map,
                     error_codes: cx.shared.codes,
                     edition: cx.shared.edition(),
                     playground: &cx.shared.playground,
                     heading_offset: HeadingOffset::H4,
-                })
+                }
+                .split_summary_and_content()
             })
             .unwrap_or((None, None));
         render_impl_summary(