feat: [WIP] generate alt text for ref elements

crates/typst-library/src/model/bibliography.rs

@@ -877,7 +877,7 @@ impl<'a> Generator<'a> {
                         renderer.display_elem_child(elem, &mut None, false)?;
                     if let Some(location) = first_occurrences.get(item.key.as_str()) {
                         let dest = Destination::Location(*location);
-                        // TODO: accept user supplied alt text
+                        // TODO(accessibility): generate alt text
                         content = content.linked(dest, None);
                     }
                     StrResult::Ok(content)
@@ -1013,7 +1013,7 @@ impl ElemRenderer<'_> {
         if let Some(hayagriva::ElemMeta::Entry(i)) = elem.meta {
             if let Some(location) = (self.link)(i) {
                 let dest = Destination::Location(location);
-                // TODO: accept user supplied alt text
+                // TODO(accessibility): generate alt text
                 content = content.linked(dest, None);
             }
         }

crates/typst-library/src/model/footnote.rs

@@ -147,7 +147,7 @@ impl Show for Packed<FootnoteElem> {
         let sup = SuperElem::new(num).pack().spanned(span);
         let loc = loc.variant(1);
         // Add zero-width weak spacing to make the footnote "sticky".
-        // TODO: accept user supplied alt text
+        // TODO(accessibility): generate alt text
         Ok(HElem::hole().pack() + sup.linked(Destination::Location(loc), None))
     }
 }
@@ -297,7 +297,7 @@ impl Show for Packed<FootnoteEntry> {
         let sup = SuperElem::new(num)
             .pack()
             .spanned(span)
-            // TODO: accept user supplied alt text
+            // TODO(accessibility): generate alt text
             .linked(Destination::Location(loc), None)
             .located(loc.variant(1));
 

crates/typst-library/src/model/outline.rs

@@ -2,7 +2,7 @@ use std::num::NonZeroUsize;
 use std::str::FromStr;
 
 use comemo::{Track, Tracked};
-use ecow::eco_format;
+use ecow::{eco_format, EcoString};
 use smallvec::SmallVec;
 use typst_syntax::Span;
 use typst_utils::{Get, NonZeroExt};
@@ -23,7 +23,7 @@ use crate::layout::{
 };
 use crate::math::EquationElem;
 use crate::model::{Destination, HeadingElem, NumberingPattern, ParElem, Refable};
-use crate::text::{LocalName, SpaceElem, TextElem};
+use crate::text::{LocalName, SmartQuoteElem, SmartQuotes, SpaceElem, TextElem};
 
 /// A table of contents, figures, or other elements.
 ///
@@ -435,18 +435,11 @@ impl Show for Packed<OutlineEntry> {
         let context = Context::new(None, Some(styles));
         let context = context.track();
 
-        // TODO: prefix should be wrapped in a `Lbl` structure element
+        // TODO(accessibility): prefix should be wrapped in a `Lbl` structure element
         let prefix = self.prefix(engine, context, span)?;
         let body = self.body().at(span)?;
         let page = self.page(engine, context, span)?;
-        let alt = {
+        let alt = alt_text(styles, &prefix, &body, &page);
-            // TODO: accept user supplied alt text
-            let prefix = prefix.as_ref().map(|p| p.plain_text()).unwrap_or_default();
-            let body = body.plain_text();
-            let page_str = PageElem::local_name_in(styles);
-            let page_nr = page.plain_text();
-            eco_format!("{prefix} \"{body}\", {page_str} {page_nr}")
-        };
         let inner = self.inner(context, span, body, page)?;
         let block = if self.element.is::<EquationElem>() {
             let body = prefix.unwrap_or_default() + inner;
@@ -704,6 +697,27 @@ cast! {
     v: Content => v.unpack::<Self>().map_err(|_| "expected outline entry")?
 }
 
+fn alt_text(
+    styles: StyleChain,
+    prefix: &Option<Content>,
+    body: &Content,
+    page: &Content,
+) -> EcoString {
+    let prefix = prefix.as_ref().map(|p| p.plain_text()).unwrap_or_default();
+    let body = body.plain_text();
+    let page_str = PageElem::local_name_in(styles);
+    let page_nr = page.plain_text();
+    let quotes = SmartQuotes::get(
+        SmartQuoteElem::quotes_in(styles),
+        TextElem::lang_in(styles),
+        TextElem::region_in(styles),
+        SmartQuoteElem::alternative_in(styles),
+    );
+    let open = quotes.double_open;
+    let close = quotes.double_close;
+    eco_format!("{prefix} {open}{body}{close} {page_str} {page_nr}",)
+}
+
 /// Measures the width of a prefix.
 fn measure_prefix(
     engine: &mut Engine,

crates/typst-library/src/model/reference.rs

@@ -338,13 +338,18 @@ fn show_reference(
         Smart::Custom(Some(supplement)) => supplement.resolve(engine, styles, [elem])?,
     };
 
+    let alt = {
+        let supplement = supplement.plain_text();
+        let numbering = numbers.plain_text();
+        eco_format!("{supplement} {numbering}",)
+    };
+
     let mut content = numbers;
     if !supplement.is_empty() {
         content = supplement + TextElem::packed("\u{a0}") + content;
     }
 
-    // TODO: accept user supplied alt text
+    Ok(content.linked(Destination::Location(loc), Some(alt)))
-    Ok(content.linked(Destination::Location(loc), None))
 }
 
 /// Turn a reference into a citation.