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feat: [WIP] allow specifying alt text for links

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# Date:      Wed May 28 17:47:35 2025 +0200
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# On branch pdf-accessibility
# Your branch and 'origin/pdf-accessibility' have diverged,
# and have 11 and 5 different commits each, respectively.
#
# Changes to be committed:
#	modified:   crates/typst-ide/src/jump.rs
#	modified:   crates/typst-layout/src/flow/distribute.rs
#	modified:   crates/typst-layout/src/modifiers.rs
#	modified:   crates/typst-library/src/foundations/content.rs
#	modified:   crates/typst-library/src/layout/frame.rs
#	modified:   crates/typst-library/src/model/bibliography.rs
#	modified:   crates/typst-library/src/model/footnote.rs
#	modified:   crates/typst-library/src/model/link.rs
#	modified:   crates/typst-library/src/model/outline.rs
#	modified:   crates/typst-library/src/model/reference.rs
#	modified:   crates/typst-pdf/src/convert.rs
#	modified:   crates/typst-pdf/src/link.rs
#	modified:   crates/typst-render/src/lib.rs
#	modified:   crates/typst-svg/src/lib.rs
#	modified:   tests/src/run.rs
#
This commit is contained in:
Tobias Schmitz 2025-05-28 17:47:35 +02:00
parent f43599c3da
commit 9d788cd73d
No known key found for this signature in database
15 changed files with 84 additions and 73 deletions
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2
crates/typst-ide/src/jump.rs
View File

@ -36,7 +36,7 @@ pub fn jump_from_click(
) -> Option<Jump> {
// Try to find a link first.
for (pos, item) in frame.items() {
if let FrameItem::Link(dest, size) = item {
if let FrameItem::Link(_, dest, size) = item {
if is_in_rect(*pos, *size, click) {
return Some(match dest {
Destination::Url(url) => Jump::Url(url.clone()),

2
crates/typst-layout/src/flow/distribute.rs
View File

@ -93,7 +93,7 @@ impl Item<'_, '_> {
Self::Frame(frame, _) => {
frame.size().is_zero()
&& frame.items().all(|(_, item)| {
matches!(item, FrameItem::Link(_, _) | FrameItem::Tag(_))
matches!(item, FrameItem::Link(..) | FrameItem::Tag(_))
})
}
Self::Placed(_, placed) => !placed.float,

6
crates/typst-layout/src/modifiers.rs
View File

@ -1,3 +1,4 @@
use ecow::EcoString;
use typst_library::foundations::StyleChain;
use typst_library::layout::{Abs, Fragment, Frame, FrameItem, HideElem, Point, Sides};
use typst_library::model::{Destination, LinkElem, ParElem};
@ -21,6 +22,7 @@ use typst_library::model::{Destination, LinkElem, ParElem};
pub struct FrameModifiers {
/// A destination to link to.
dest: Option<Destination>,
alt: Option<EcoString>,
/// Whether the contents of the frame should be hidden.
hidden: bool,
}
@ -28,8 +30,10 @@ pub struct FrameModifiers {
impl FrameModifiers {
/// Retrieve all modifications that should be applied per-frame.
pub fn get_in(styles: StyleChain) -> Self {
// TODO: maybe verify that an alt text was provided here
Self {
dest: LinkElem::current_in(styles),
alt: LinkElem::alt_in(styles),
hidden: HideElem::hidden_in(styles),
}
}
@ -102,7 +106,7 @@ fn modify_frame(
pos.x -= outset.left;
size += outset.sum_by_axis();
}
frame.push(pos, FrameItem::Link(dest.clone(), size));
frame.push(pos, FrameItem::Link(modifiers.alt.clone(), dest.clone(), size));
}
if modifiers.hidden {

5
crates/typst-library/src/foundations/content.rs
View File

@ -503,8 +503,9 @@ impl Content {
}
/// Link the content somewhere.
pub fn linked(self, dest: Destination) -> Self {
self.styled(LinkElem::set_current(Some(dest)))
pub fn linked(self, alt: Option<EcoString>, dest: Destination) -> Self {
self.styled(LinkElem::set_alt(alt))
.styled(LinkElem::set_current(Some(dest)))
}
/// Set alignments for this content.

5
crates/typst-library/src/layout/frame.rs
View File

@ -4,6 +4,7 @@ use std::fmt::{self, Debug, Formatter};
use std::num::NonZeroUsize;
use std::sync::Arc;
use ecow::EcoString;
use typst_syntax::Span;
use typst_utils::{LazyHash, Numeric};
@ -473,7 +474,7 @@ pub enum FrameItem {
/// An image and its size.
Image(Image, Size, Span),
/// An internal or external link to a destination.
Link(Destination, Size),
Link(Option<EcoString>, Destination, Size),
/// An introspectable element that produced something within this frame.
Tag(Tag),
}
@ -485,7 +486,7 @@ impl Debug for FrameItem {
Self::Text(text) => write!(f, "{text:?}"),
Self::Shape(shape, _) => write!(f, "{shape:?}"),
Self::Image(image, _, _) => write!(f, "{image:?}"),
Self::Link(dest, _) => write!(f, "Link({dest:?})"),
Self::Link(alt, dest, _) => write!(f, "Link({alt:?}, {dest:?})"),
Self::Tag(tag) => write!(f, "{tag:?}"),
}
}

6
crates/typst-library/src/model/bibliography.rs
View File

@ -873,7 +873,8 @@ 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);
content = content.linked(dest);
// TODO: accept user supplied alt text
content = content.linked(None, dest);
}
StrResult::Ok(content)
})
@ -1008,7 +1009,8 @@ impl ElemRenderer<'_> {
if let Some(hayagriva::ElemMeta::Entry(i)) = elem.meta {
if let Some(location) = (self.link)(i) {
let dest = Destination::Location(location);
content = content.linked(dest);
// TODO: accept user supplied alt text
content = content.linked(None, dest);
}
}

6
crates/typst-library/src/model/footnote.rs
View File

@ -147,7 +147,8 @@ 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".
Ok(HElem::hole().pack() + sup.linked(Destination::Location(loc)))
// TODO: accept user supplied alt text
Ok(HElem::hole().pack() + sup.linked(None, Destination::Location(loc)))
}
}
@ -296,7 +297,8 @@ impl Show for Packed<FootnoteEntry> {
let sup = SuperElem::new(num)
.pack()
.spanned(span)
.linked(Destination::Location(loc))
// TODO: accept user supplied alt text
.linked(None, Destination::Location(loc))
.located(loc.variant(1));
Ok(Content::sequence([

8
crates/typst-library/src/model/link.rs
View File

@ -40,6 +40,9 @@ use crate::text::TextElem;
/// `https://` is automatically turned into a link.
#[elem(Locatable, Show)]
pub struct LinkElem {
/// A text describing the link.
pub alt: Option<EcoString>,
/// The destination the link points to.
///
/// - To link to web pages, `dest` should be a valid URL string. If the URL
@ -123,12 +126,13 @@ impl Show for Packed<LinkElem> {
body
}
} else {
let alt = self.alt(styles);
match &self.dest {
LinkTarget::Dest(dest) => body.linked(dest.clone()),
LinkTarget::Dest(dest) => body.linked(alt, dest.clone()),
LinkTarget::Label(label) => {
let elem = engine.introspector.query_label(*label).at(self.span())?;
let dest = Destination::Location(elem.location().unwrap());
body.clone().linked(dest)
body.clone().linked(alt, dest)
}
}
})

24
crates/typst-library/src/model/outline.rs
View File

@ -2,6 +2,7 @@ use std::num::NonZeroUsize;
use std::str::FromStr;
use comemo::{Track, Tracked};
use ecow::eco_format;
use smallvec::SmallVec;
use typst_syntax::Span;
use typst_utils::{Get, NonZeroExt};
@ -17,8 +18,7 @@ use crate::introspection::{
Counter, CounterKey, Introspector, Locatable, Location, Locator, LocatorLink,
};
use crate::layout::{
Abs, Axes, BlockBody, BlockElem, BoxElem, Dir, Em, Fr, HElem, Length, Region, Rel,
RepeatElem, Sides,
Abs, Axes, BlockBody, BlockElem, BoxElem, Dir, Em, Fr, HElem, Length, PageElem, Region, Rel, RepeatElem, Sides
};
use crate::math::EquationElem;
use crate::model::{Destination, HeadingElem, NumberingPattern, ParElem, Refable};
@ -422,7 +422,17 @@ impl Show for Packed<OutlineEntry> {
let context = context.track();
let prefix = self.prefix(engine, context, span)?;
let inner = self.inner(engine, context, span)?;
let body = self.body().at(span)?;
let page = self.page(engine, context, span)?;
let alt = {
// 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(engine, context, span, body, page)?;
let block = if self.element.is::<EquationElem>() {
let body = prefix.unwrap_or_default() + inner;
BlockElem::new()
@ -434,7 +444,7 @@ impl Show for Packed<OutlineEntry> {
};
let loc = self.element_location().at(span)?;
Ok(block.linked(Destination::Location(loc)))
Ok(block.linked(Some(alt), Destination::Location(loc)))
}
}
@ -571,6 +581,8 @@ impl OutlineEntry {
engine: &mut Engine,
context: Tracked<Context>,
span: Span,
body: Content,
page: Content,
) -> SourceResult<Content> {
let styles = context.styles().at(span)?;
@ -591,7 +603,7 @@ impl OutlineEntry {
seq.push(TextElem::packed("\u{202B}"));
}
seq.push(self.body().at(span)?);
seq.push(body);
if rtl {
// "Pop Directional Formatting"
@ -616,7 +628,7 @@ impl OutlineEntry {
// Add the page number. The word joiner in front ensures that the page
// number doesn't stand alone in its line.
seq.push(TextElem::packed("\u{2060}"));
seq.push(self.page(engine, context, span)?);
seq.push(page);
Ok(Content::sequence(seq))
}

3
crates/typst-library/src/model/reference.rs
View File

@ -309,7 +309,8 @@ fn show_reference(
content = supplement + TextElem::packed("\u{a0}") + content;
}
Ok(content.linked(Destination::Location(loc)))
// TODO: accept user supplied alt text
Ok(content.linked(None, Destination::Location(loc)))
}
/// Turn a reference into a citation.

6
crates/typst-pdf/src/convert.rs
View File

@ -1,7 +1,7 @@
use std::collections::{BTreeMap, HashMap, HashSet};
use std::num::NonZeroU64;
use ecow::{eco_format, EcoVec};
use ecow::{eco_format, EcoString, EcoVec};
use krilla::annotation::Annotation;
use krilla::configure::{Configuration, ValidationError, Validator};
use krilla::destination::{NamedDestination, XyzDestination};
@ -314,7 +314,9 @@ pub(crate) fn handle_frame(
FrameItem::Image(image, size, span) => {
handle_image(gc, fc, image, *size, surface, *span)?
}
FrameItem::Link(d, s) => handle_link(fc, gc, d, *s),
FrameItem::Link(alt, dest, size) => {
handle_link(fc, gc, alt.as_ref().map(EcoString::to_string), dest, *size)
}
FrameItem::Tag(introspection::Tag::Start(elem)) => {
handle_open_tag(gc, surface, elem)
}

76
crates/typst-pdf/src/link.rs
View File

@ -2,7 +2,7 @@ use krilla::action::{Action, LinkAction};
use krilla::annotation::{Annotation, LinkAnnotation, Target};
use krilla::destination::XyzDestination;
use krilla::geom::Rect;
use typst_library::layout::{Abs, Point, Size};
use typst_library::layout::{Abs, Point, Position, Size};
use typst_library::model::Destination;
use crate::convert::{FrameContext, GlobalContext};
@ -12,6 +12,7 @@ use crate::util::{AbsExt, PointExt};
pub(crate) fn handle_link(
fc: &mut FrameContext,
gc: &mut GlobalContext,
alt: Option<String>,
dest: &Destination,
size: Size,
) {
@ -45,61 +46,42 @@ pub(crate) fn handle_link(
// TODO: Support quad points.
let placeholder = gc.tags.reserve_placeholder();
gc.tags.push(TagNode::Placeholder(placeholder));
// TODO: add some way to add alt text to annotations.
// probably through [typst_layout::modifiers::FrameModifiers]
let pos = match dest {
let target = match dest {
Destination::Url(u) => {
fc.push_annotation(
placeholder,
Annotation::new_link(
LinkAnnotation::new(
rect,
None,
Target::Action(Action::Link(LinkAction::new(u.to_string()))),
),
Some(u.to_string()),
),
);
return;
Target::Action(Action::Link(LinkAction::new(u.to_string())))
}
Destination::Position(p) => *p,
Destination::Position(p) => match pos_to_target(gc, *p) {
Some(target) => target,
None => return,
},
Destination::Location(loc) => {
if let Some(nd) = gc.loc_to_names.get(loc) {
// If a named destination has been registered, it's already guaranteed to
// not point to an excluded page.
fc.push_annotation(
placeholder,
LinkAnnotation::new(
rect,
None,
Target::Destination(krilla::destination::Destination::Named(
nd.clone(),
)),
)
.into(),
);
return;
Target::Destination(krilla::destination::Destination::Named(nd.clone()))
} else {
gc.document.introspector.position(*loc)
let pos = gc.document.introspector.position(*loc);
match pos_to_target(gc, pos) {
Some(target) => target,
None => return,
}
}
}
};
let page_index = pos.page.get() - 1;
if let Some(index) = gc.page_index_converter.pdf_page_index(page_index) {
fc.push_annotation(
placeholder,
LinkAnnotation::new(
rect,
None,
Target::Destination(krilla::destination::Destination::Xyz(
XyzDestination::new(index, pos.point.to_krilla()),
)),
)
.into(),
);
}
let placeholder = gc.tags.reserve_placeholder();
gc.tags.push(TagNode::Placeholder(placeholder));
fc.push_annotation(
placeholder,
Annotation::new_link(LinkAnnotation::new(rect, None, target), alt),
);
}
fn pos_to_target(gc: &mut GlobalContext, pos: Position) -> Option<Target> {
let page_index = pos.page.get() - 1;
let index = gc.page_index_converter.pdf_page_index(page_index)?;
let dest = XyzDestination::new(index, pos.point.to_krilla());
Some(Target::Destination(krilla::destination::Destination::Xyz(dest)))
}

2
crates/typst-render/src/lib.rs
View File

@ -167,7 +167,7 @@ fn render_frame(canvas: &mut sk::Pixmap, state: State, frame: &Frame) {
FrameItem::Image(image, size, _) => {
image::render_image(canvas, state.pre_translate(*pos), image, *size);
}
FrameItem::Link(_, _) => {}
FrameItem::Link(..) => {}
FrameItem::Tag(_) => {}
}
}

4
crates/typst-svg/src/lib.rs
View File

@ -207,7 +207,7 @@ impl SVGRenderer {
for (pos, item) in frame.items() {
// File size optimization.
// TODO: SVGs could contain links, couldn't they?
if matches!(item, FrameItem::Link(_, _) | FrameItem::Tag(_)) {
if matches!(item, FrameItem::Link(..) | FrameItem::Tag(_)) {
continue;
}
@ -228,7 +228,7 @@ impl SVGRenderer {
self.render_shape(state.pre_translate(*pos), shape)
}
FrameItem::Image(image, size, _) => self.render_image(image, size),
FrameItem::Link(_, _) => unreachable!(),
FrameItem::Link(..) => unreachable!(),
FrameItem::Tag(_) => unreachable!(),
};

2
tests/src/run.rs
View File

@ -524,7 +524,7 @@ fn render_links(canvas: &mut sk::Pixmap, ts: sk::Transform, frame: &Frame) {
let ts = ts.pre_concat(to_sk_transform(&group.transform));
render_links(canvas, ts, &group.frame);
}
FrameItem::Link(_, size) => {
FrameItem::Link(_, _, size) => {
let w = size.x.to_pt() as f32;
let h = size.y.to_pt() as f32;
let rect = sk::Rect::from_xywh(0.0, 0.0, w, h).unwrap();