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-rw-r--r--crates/typst-layout/src/lib.rs16
-rw-r--r--crates/typst-layout/src/rules.rs890
2 files changed, 893 insertions, 13 deletions
diff --git a/crates/typst-layout/src/lib.rs b/crates/typst-layout/src/lib.rs
index 443e90d6..361bab46 100644
--- a/crates/typst-layout/src/lib.rs
+++ b/crates/typst-layout/src/lib.rs
@@ -10,21 +10,11 @@ mod modifiers;
mod pad;
mod pages;
mod repeat;
+mod rules;
mod shapes;
mod stack;
mod transforms;
-pub use self::flow::{layout_columns, layout_fragment, layout_frame};
-pub use self::grid::{layout_grid, layout_table};
-pub use self::image::layout_image;
-pub use self::lists::{layout_enum, layout_list};
-pub use self::math::{layout_equation_block, layout_equation_inline};
-pub use self::pad::layout_pad;
+pub use self::flow::{layout_fragment, layout_frame};
pub use self::pages::layout_document;
-pub use self::repeat::layout_repeat;
-pub use self::shapes::{
- layout_circle, layout_curve, layout_ellipse, layout_line, layout_path,
- layout_polygon, layout_rect, layout_square,
-};
-pub use self::stack::layout_stack;
-pub use self::transforms::{layout_move, layout_rotate, layout_scale, layout_skew};
+pub use self::rules::register;
diff --git a/crates/typst-layout/src/rules.rs b/crates/typst-layout/src/rules.rs
new file mode 100644
index 00000000..ebccd92e
--- /dev/null
+++ b/crates/typst-layout/src/rules.rs
@@ -0,0 +1,890 @@
+use std::num::NonZeroUsize;
+
+use comemo::Track;
+use ecow::{eco_format, EcoVec};
+use smallvec::smallvec;
+use typst_library::diag::{bail, At, SourceResult};
+use typst_library::foundations::{
+ dict, Content, Context, NativeElement, NativeRuleMap, Packed, Resolve, ShowFn, Smart,
+ StyleChain, Target,
+};
+use typst_library::introspection::{Counter, Locator, LocatorLink};
+use typst_library::layout::{
+ Abs, AlignElem, Alignment, Axes, BlockBody, BlockElem, ColumnsElem, Em, GridCell,
+ GridChild, GridElem, GridItem, HAlignment, HElem, HideElem, InlineElem, LayoutElem,
+ Length, MoveElem, OuterVAlignment, PadElem, PlaceElem, PlacementScope, Region, Rel,
+ RepeatElem, RotateElem, ScaleElem, Sides, Size, Sizing, SkewElem, Spacing,
+ StackChild, StackElem, TrackSizings, VElem,
+};
+use typst_library::math::EquationElem;
+use typst_library::model::{
+ Attribution, BibliographyElem, CiteElem, CiteGroup, CslSource, Destination, EmphElem,
+ EnumElem, FigureCaption, FigureElem, FootnoteElem, FootnoteEntry, HeadingElem,
+ LinkElem, LinkTarget, ListElem, Outlinable, OutlineElem, OutlineEntry, ParElem,
+ ParbreakElem, QuoteElem, RefElem, StrongElem, TableCell, TableElem, TermsElem, Works,
+};
+use typst_library::pdf::EmbedElem;
+use typst_library::text::{
+ DecoLine, Decoration, HighlightElem, ItalicToggle, LinebreakElem, LocalName,
+ OverlineElem, RawElem, RawLine, ScriptKind, ShiftSettings, Smallcaps, SmallcapsElem,
+ SpaceElem, StrikeElem, SubElem, SuperElem, TextElem, TextSize, UnderlineElem,
+ WeightDelta,
+};
+use typst_library::visualize::{
+ CircleElem, CurveElem, EllipseElem, ImageElem, LineElem, PathElem, PolygonElem,
+ RectElem, SquareElem, Stroke,
+};
+use typst_utils::{Get, NonZeroExt, Numeric};
+
+/// Register show rules for the [paged target](Target::Paged).
+pub fn register(rules: &mut NativeRuleMap) {
+ use Target::Paged;
+
+ // Model.
+ rules.register(Paged, STRONG_RULE);
+ rules.register(Paged, EMPH_RULE);
+ rules.register(Paged, LIST_RULE);
+ rules.register(Paged, ENUM_RULE);
+ rules.register(Paged, TERMS_RULE);
+ rules.register(Paged, LINK_RULE);
+ rules.register(Paged, HEADING_RULE);
+ rules.register(Paged, FIGURE_RULE);
+ rules.register(Paged, FIGURE_CAPTION_RULE);
+ rules.register(Paged, QUOTE_RULE);
+ rules.register(Paged, FOOTNOTE_RULE);
+ rules.register(Paged, FOOTNOTE_ENTRY_RULE);
+ rules.register(Paged, OUTLINE_RULE);
+ rules.register(Paged, OUTLINE_ENTRY_RULE);
+ rules.register(Paged, REF_RULE);
+ rules.register(Paged, CITE_GROUP_RULE);
+ rules.register(Paged, BIBLIOGRAPHY_RULE);
+ rules.register(Paged, TABLE_RULE);
+ rules.register(Paged, TABLE_CELL_RULE);
+
+ // Text.
+ rules.register(Paged, SUB_RULE);
+ rules.register(Paged, SUPER_RULE);
+ rules.register(Paged, UNDERLINE_RULE);
+ rules.register(Paged, OVERLINE_RULE);
+ rules.register(Paged, STRIKE_RULE);
+ rules.register(Paged, HIGHLIGHT_RULE);
+ rules.register(Paged, SMALLCAPS_RULE);
+ rules.register(Paged, RAW_RULE);
+ rules.register(Paged, RAW_LINE_RULE);
+
+ // Layout.
+ rules.register(Paged, ALIGN_RULE);
+ rules.register(Paged, PAD_RULE);
+ rules.register(Paged, COLUMNS_RULE);
+ rules.register(Paged, STACK_RULE);
+ rules.register(Paged, GRID_RULE);
+ rules.register(Paged, GRID_CELL_RULE);
+ rules.register(Paged, MOVE_RULE);
+ rules.register(Paged, SCALE_RULE);
+ rules.register(Paged, ROTATE_RULE);
+ rules.register(Paged, SKEW_RULE);
+ rules.register(Paged, REPEAT_RULE);
+ rules.register(Paged, HIDE_RULE);
+ rules.register(Paged, LAYOUT_RULE);
+
+ // Visualize.
+ rules.register(Paged, IMAGE_RULE);
+ rules.register(Paged, LINE_RULE);
+ rules.register(Paged, RECT_RULE);
+ rules.register(Paged, SQUARE_RULE);
+ rules.register(Paged, ELLIPSE_RULE);
+ rules.register(Paged, CIRCLE_RULE);
+ rules.register(Paged, POLYGON_RULE);
+ rules.register(Paged, CURVE_RULE);
+ rules.register(Paged, PATH_RULE);
+
+ // Math.
+ rules.register(Paged, EQUATION_RULE);
+
+ // PDF.
+ rules.register(Paged, EMBED_RULE);
+}
+
+const STRONG_RULE: ShowFn<StrongElem> = |elem, _, styles| {
+ Ok(elem
+ .body
+ .clone()
+ .set(TextElem::delta, WeightDelta(elem.delta.get(styles))))
+};
+
+const EMPH_RULE: ShowFn<EmphElem> =
+ |elem, _, _| Ok(elem.body.clone().set(TextElem::emph, ItalicToggle(true)));
+
+const LIST_RULE: ShowFn<ListElem> = |elem, _, styles| {
+ let tight = elem.tight.get(styles);
+
+ let mut realized = BlockElem::multi_layouter(elem.clone(), crate::lists::layout_list)
+ .pack()
+ .spanned(elem.span());
+
+ if tight {
+ let spacing = elem
+ .spacing
+ .get(styles)
+ .unwrap_or_else(|| styles.get(ParElem::leading));
+ let v = VElem::new(spacing.into()).with_weak(true).with_attach(true).pack();
+ realized = v + realized;
+ }
+
+ Ok(realized)
+};
+
+const ENUM_RULE: ShowFn<EnumElem> = |elem, _, styles| {
+ let tight = elem.tight.get(styles);
+
+ let mut realized = BlockElem::multi_layouter(elem.clone(), crate::lists::layout_enum)
+ .pack()
+ .spanned(elem.span());
+
+ if tight {
+ let spacing = elem
+ .spacing
+ .get(styles)
+ .unwrap_or_else(|| styles.get(ParElem::leading));
+ let v = VElem::new(spacing.into()).with_weak(true).with_attach(true).pack();
+ realized = v + realized;
+ }
+
+ Ok(realized)
+};
+
+const TERMS_RULE: ShowFn<TermsElem> = |elem, _, styles| {
+ let span = elem.span();
+ let tight = elem.tight.get(styles);
+
+ let separator = elem.separator.get_ref(styles);
+ let indent = elem.indent.get(styles);
+ let hanging_indent = elem.hanging_indent.get(styles);
+ let gutter = elem.spacing.get(styles).unwrap_or_else(|| {
+ if tight {
+ styles.get(ParElem::leading)
+ } else {
+ styles.get(ParElem::spacing)
+ }
+ });
+
+ let pad = hanging_indent + indent;
+ let unpad = (!hanging_indent.is_zero())
+ .then(|| HElem::new((-hanging_indent).into()).pack().spanned(span));
+
+ let mut children = vec![];
+ for child in elem.children.iter() {
+ let mut seq = vec![];
+ seq.extend(unpad.clone());
+ seq.push(child.term.clone().strong());
+ seq.push(separator.clone());
+ seq.push(child.description.clone());
+
+ // Text in wide term lists shall always turn into paragraphs.
+ if !tight {
+ seq.push(ParbreakElem::shared().clone());
+ }
+
+ children.push(StackChild::Block(Content::sequence(seq)));
+ }
+
+ let padding =
+ Sides::default().with(styles.resolve(TextElem::dir).start(), pad.into());
+
+ let mut realized = StackElem::new(children)
+ .with_spacing(Some(gutter.into()))
+ .pack()
+ .spanned(span)
+ .padded(padding)
+ .set(TermsElem::within, true);
+
+ if tight {
+ let spacing = elem
+ .spacing
+ .get(styles)
+ .unwrap_or_else(|| styles.get(ParElem::leading));
+ let v = VElem::new(spacing.into())
+ .with_weak(true)
+ .with_attach(true)
+ .pack()
+ .spanned(span);
+ realized = v + realized;
+ }
+
+ Ok(realized)
+};
+
+const LINK_RULE: ShowFn<LinkElem> = |elem, engine, _| {
+ let body = elem.body.clone();
+ Ok(match &elem.dest {
+ LinkTarget::Dest(dest) => body.linked(dest.clone()),
+ LinkTarget::Label(label) => {
+ let elem = engine.introspector.query_label(*label).at(elem.span())?;
+ let dest = Destination::Location(elem.location().unwrap());
+ body.linked(dest)
+ }
+ })
+};
+
+const HEADING_RULE: ShowFn<HeadingElem> = |elem, engine, styles| {
+ const SPACING_TO_NUMBERING: Em = Em::new(0.3);
+
+ let span = elem.span();
+ let mut realized = elem.body.clone();
+
+ let hanging_indent = elem.hanging_indent.get(styles);
+ let mut indent = match hanging_indent {
+ Smart::Custom(length) => length.resolve(styles),
+ Smart::Auto => Abs::zero(),
+ };
+
+ if let Some(numbering) = elem.numbering.get_ref(styles).as_ref() {
+ let location = elem.location().unwrap();
+ let numbering = Counter::of(HeadingElem::ELEM)
+ .display_at_loc(engine, location, styles, numbering)?
+ .spanned(span);
+
+ if hanging_indent.is_auto() {
+ let pod = Region::new(Axes::splat(Abs::inf()), Axes::splat(false));
+
+ // We don't have a locator for the numbering here, so we just
+ // use the measurement infrastructure for now.
+ let link = LocatorLink::measure(location);
+ let size = (engine.routines.layout_frame)(
+ engine,
+ &numbering,
+ Locator::link(&link),
+ styles,
+ pod,
+ )?
+ .size();
+
+ indent = size.x + SPACING_TO_NUMBERING.resolve(styles);
+ }
+
+ let spacing = HElem::new(SPACING_TO_NUMBERING.into()).with_weak(true).pack();
+
+ realized = numbering + spacing + realized;
+ }
+
+ let block = if indent != Abs::zero() {
+ let body = HElem::new((-indent).into()).pack() + realized;
+ let inset = Sides::default()
+ .with(styles.resolve(TextElem::dir).start(), Some(indent.into()));
+ BlockElem::new()
+ .with_body(Some(BlockBody::Content(body)))
+ .with_inset(inset)
+ } else {
+ BlockElem::new().with_body(Some(BlockBody::Content(realized)))
+ };
+
+ Ok(block.pack().spanned(span))
+};
+
+const FIGURE_RULE: ShowFn<FigureElem> = |elem, _, styles| {
+ let span = elem.span();
+ let mut realized = elem.body.clone();
+
+ // Build the caption, if any.
+ if let Some(caption) = elem.caption.get_cloned(styles) {
+ let (first, second) = match caption.position.get(styles) {
+ OuterVAlignment::Top => (caption.pack(), realized),
+ OuterVAlignment::Bottom => (realized, caption.pack()),
+ };
+ realized = Content::sequence(vec![
+ first,
+ VElem::new(elem.gap.get(styles).into())
+ .with_weak(true)
+ .pack()
+ .spanned(span),
+ second,
+ ]);
+ }
+
+ // Ensure that the body is considered a paragraph.
+ realized += ParbreakElem::shared().clone().spanned(span);
+
+ // Wrap the contents in a block.
+ realized = BlockElem::new()
+ .with_body(Some(BlockBody::Content(realized)))
+ .pack()
+ .spanned(span);
+
+ // Wrap in a float.
+ if let Some(align) = elem.placement.get(styles) {
+ realized = PlaceElem::new(realized)
+ .with_alignment(align.map(|align| HAlignment::Center + align))
+ .with_scope(elem.scope.get(styles))
+ .with_float(true)
+ .pack()
+ .spanned(span);
+ } else if elem.scope.get(styles) == PlacementScope::Parent {
+ bail!(
+ span,
+ "parent-scoped placement is only available for floating figures";
+ hint: "you can enable floating placement with `figure(placement: auto, ..)`"
+ );
+ }
+
+ Ok(realized)
+};
+
+const FIGURE_CAPTION_RULE: ShowFn<FigureCaption> = |elem, engine, styles| {
+ Ok(BlockElem::new()
+ .with_body(Some(BlockBody::Content(elem.realize(engine, styles)?)))
+ .pack()
+ .spanned(elem.span()))
+};
+
+const QUOTE_RULE: ShowFn<QuoteElem> = |elem, _, styles| {
+ let span = elem.span();
+ let block = elem.block.get(styles);
+
+ let mut realized = elem.body.clone();
+
+ if elem.quotes.get(styles).unwrap_or(!block) {
+ // Add zero-width weak spacing to make the quotes "sticky".
+ let hole = HElem::hole().pack();
+ let sticky = Content::sequence([hole.clone(), realized, hole]);
+ realized = QuoteElem::quoted(sticky, styles);
+ }
+
+ let attribution = elem.attribution.get_ref(styles);
+
+ if block {
+ realized = BlockElem::new()
+ .with_body(Some(BlockBody::Content(realized)))
+ .pack()
+ .spanned(span);
+
+ if let Some(attribution) = attribution.as_ref() {
+ // Bring the attribution a bit closer to the quote.
+ let gap = Spacing::Rel(Em::new(0.9).into());
+ let v = VElem::new(gap).with_weak(true).pack();
+ realized += v;
+ realized += BlockElem::new()
+ .with_body(Some(BlockBody::Content(attribution.realize(span))))
+ .pack()
+ .aligned(Alignment::END);
+ }
+
+ realized = PadElem::new(realized).pack();
+ } else if let Some(Attribution::Label(label)) = attribution {
+ realized += SpaceElem::shared().clone();
+ realized += CiteElem::new(*label).pack().spanned(span);
+ }
+
+ Ok(realized)
+};
+
+const FOOTNOTE_RULE: ShowFn<FootnoteElem> = |elem, engine, styles| {
+ let span = elem.span();
+ let loc = elem.declaration_location(engine).at(span)?;
+ let numbering = elem.numbering.get_ref(styles);
+ let counter = Counter::of(FootnoteElem::ELEM);
+ let num = counter.display_at_loc(engine, loc, styles, numbering)?;
+ 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)))
+};
+
+const FOOTNOTE_ENTRY_RULE: ShowFn<FootnoteEntry> = |elem, engine, styles| {
+ let span = elem.span();
+ let number_gap = Em::new(0.05);
+ let default = StyleChain::default();
+ let numbering = elem.note.numbering.get_ref(default);
+ let counter = Counter::of(FootnoteElem::ELEM);
+ let Some(loc) = elem.note.location() else {
+ bail!(
+ span, "footnote entry must have a location";
+ hint: "try using a query or a show rule to customize the footnote instead"
+ );
+ };
+
+ let num = counter.display_at_loc(engine, loc, styles, numbering)?;
+ let sup = SuperElem::new(num)
+ .pack()
+ .spanned(span)
+ .linked(Destination::Location(loc))
+ .located(loc.variant(1));
+
+ Ok(Content::sequence([
+ HElem::new(elem.indent.get(styles).into()).pack(),
+ sup,
+ HElem::new(number_gap.into()).with_weak(true).pack(),
+ elem.note.body_content().unwrap().clone(),
+ ]))
+};
+
+const OUTLINE_RULE: ShowFn<OutlineElem> = |elem, engine, styles| {
+ let span = elem.span();
+
+ // Build the outline title.
+ let mut seq = vec![];
+ if let Some(title) = elem.title.get_cloned(styles).unwrap_or_else(|| {
+ Some(TextElem::packed(Packed::<OutlineElem>::local_name_in(styles)).spanned(span))
+ }) {
+ seq.push(
+ HeadingElem::new(title)
+ .with_depth(NonZeroUsize::ONE)
+ .pack()
+ .spanned(span),
+ );
+ }
+
+ let elems = engine.introspector.query(&elem.target.get_ref(styles).0);
+ let depth = elem.depth.get(styles).unwrap_or(NonZeroUsize::MAX);
+
+ // Build the outline entries.
+ for elem in elems {
+ let Some(outlinable) = elem.with::<dyn Outlinable>() else {
+ bail!(span, "cannot outline {}", elem.func().name());
+ };
+
+ let level = outlinable.level();
+ if outlinable.outlined() && level <= depth {
+ let entry = OutlineEntry::new(level, elem);
+ seq.push(entry.pack().spanned(span));
+ }
+ }
+
+ Ok(Content::sequence(seq))
+};
+
+const OUTLINE_ENTRY_RULE: ShowFn<OutlineEntry> = |elem, engine, styles| {
+ let span = elem.span();
+ let context = Context::new(None, Some(styles));
+ let context = context.track();
+
+ let prefix = elem.prefix(engine, context, span)?;
+ let inner = elem.inner(engine, context, span)?;
+ let block = if elem.element.is::<EquationElem>() {
+ let body = prefix.unwrap_or_default() + inner;
+ BlockElem::new()
+ .with_body(Some(BlockBody::Content(body)))
+ .pack()
+ .spanned(span)
+ } else {
+ elem.indented(engine, context, span, prefix, inner, Em::new(0.5).into())?
+ };
+
+ let loc = elem.element_location().at(span)?;
+ Ok(block.linked(Destination::Location(loc)))
+};
+
+const REF_RULE: ShowFn<RefElem> = |elem, engine, styles| elem.realize(engine, styles);
+
+const CITE_GROUP_RULE: ShowFn<CiteGroup> = |elem, engine, _| elem.realize(engine);
+
+const BIBLIOGRAPHY_RULE: ShowFn<BibliographyElem> = |elem, engine, styles| {
+ const COLUMN_GUTTER: Em = Em::new(0.65);
+ const INDENT: Em = Em::new(1.5);
+
+ let span = elem.span();
+
+ let mut seq = vec![];
+ if let Some(title) = elem.title.get_ref(styles).clone().unwrap_or_else(|| {
+ Some(
+ TextElem::packed(Packed::<BibliographyElem>::local_name_in(styles))
+ .spanned(span),
+ )
+ }) {
+ seq.push(
+ HeadingElem::new(title)
+ .with_depth(NonZeroUsize::ONE)
+ .pack()
+ .spanned(span),
+ );
+ }
+
+ let works = Works::generate(engine).at(span)?;
+ let references = works
+ .references
+ .as_ref()
+ .ok_or_else(|| match elem.style.get_ref(styles).source {
+ CslSource::Named(style) => eco_format!(
+ "CSL style \"{}\" is not suitable for bibliographies",
+ style.display_name()
+ ),
+ CslSource::Normal(..) => {
+ "CSL style is not suitable for bibliographies".into()
+ }
+ })
+ .at(span)?;
+
+ if references.iter().any(|(prefix, _)| prefix.is_some()) {
+ let row_gutter = styles.get(ParElem::spacing);
+
+ let mut cells = vec![];
+ for (prefix, reference) in references {
+ cells.push(GridChild::Item(GridItem::Cell(
+ Packed::new(GridCell::new(prefix.clone().unwrap_or_default()))
+ .spanned(span),
+ )));
+ cells.push(GridChild::Item(GridItem::Cell(
+ Packed::new(GridCell::new(reference.clone())).spanned(span),
+ )));
+ }
+ seq.push(
+ GridElem::new(cells)
+ .with_columns(TrackSizings(smallvec![Sizing::Auto; 2]))
+ .with_column_gutter(TrackSizings(smallvec![COLUMN_GUTTER.into()]))
+ .with_row_gutter(TrackSizings(smallvec![row_gutter.into()]))
+ .pack()
+ .spanned(span),
+ );
+ } else {
+ for (_, reference) in references {
+ let realized = reference.clone();
+ let block = if works.hanging_indent {
+ let body = HElem::new((-INDENT).into()).pack() + realized;
+ let inset = Sides::default()
+ .with(styles.resolve(TextElem::dir).start(), Some(INDENT.into()));
+ BlockElem::new()
+ .with_body(Some(BlockBody::Content(body)))
+ .with_inset(inset)
+ } else {
+ BlockElem::new().with_body(Some(BlockBody::Content(realized)))
+ };
+
+ seq.push(block.pack().spanned(span));
+ }
+ }
+
+ Ok(Content::sequence(seq))
+};
+
+const TABLE_RULE: ShowFn<TableElem> = |elem, _, _| {
+ Ok(BlockElem::multi_layouter(elem.clone(), crate::grid::layout_table)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const TABLE_CELL_RULE: ShowFn<TableCell> = |elem, _, styles| {
+ show_cell(elem.body.clone(), elem.inset.get(styles), elem.align.get(styles))
+};
+
+const SUB_RULE: ShowFn<SubElem> = |elem, _, styles| {
+ show_script(
+ styles,
+ elem.body.clone(),
+ elem.typographic.get(styles),
+ elem.baseline.get(styles),
+ elem.size.get(styles),
+ ScriptKind::Sub,
+ )
+};
+
+const SUPER_RULE: ShowFn<SuperElem> = |elem, _, styles| {
+ show_script(
+ styles,
+ elem.body.clone(),
+ elem.typographic.get(styles),
+ elem.baseline.get(styles),
+ elem.size.get(styles),
+ ScriptKind::Super,
+ )
+};
+
+fn show_script(
+ styles: StyleChain,
+ body: Content,
+ typographic: bool,
+ baseline: Smart<Length>,
+ size: Smart<TextSize>,
+ kind: ScriptKind,
+) -> SourceResult<Content> {
+ let font_size = styles.resolve(TextElem::size);
+ Ok(body.set(
+ TextElem::shift_settings,
+ Some(ShiftSettings {
+ typographic,
+ shift: baseline.map(|l| -Em::from_length(l, font_size)),
+ size: size.map(|t| Em::from_length(t.0, font_size)),
+ kind,
+ }),
+ ))
+}
+
+const UNDERLINE_RULE: ShowFn<UnderlineElem> = |elem, _, styles| {
+ Ok(elem.body.clone().set(
+ TextElem::deco,
+ smallvec![Decoration {
+ line: DecoLine::Underline {
+ stroke: elem.stroke.resolve(styles).unwrap_or_default(),
+ offset: elem.offset.resolve(styles),
+ evade: elem.evade.get(styles),
+ background: elem.background.get(styles),
+ },
+ extent: elem.extent.resolve(styles),
+ }],
+ ))
+};
+
+const OVERLINE_RULE: ShowFn<OverlineElem> = |elem, _, styles| {
+ Ok(elem.body.clone().set(
+ TextElem::deco,
+ smallvec![Decoration {
+ line: DecoLine::Overline {
+ stroke: elem.stroke.resolve(styles).unwrap_or_default(),
+ offset: elem.offset.resolve(styles),
+ evade: elem.evade.get(styles),
+ background: elem.background.get(styles),
+ },
+ extent: elem.extent.resolve(styles),
+ }],
+ ))
+};
+
+const STRIKE_RULE: ShowFn<StrikeElem> = |elem, _, styles| {
+ Ok(elem.body.clone().set(
+ TextElem::deco,
+ smallvec![Decoration {
+ // Note that we do not support evade option for strikethrough.
+ line: DecoLine::Strikethrough {
+ stroke: elem.stroke.resolve(styles).unwrap_or_default(),
+ offset: elem.offset.resolve(styles),
+ background: elem.background.get(styles),
+ },
+ extent: elem.extent.resolve(styles),
+ }],
+ ))
+};
+
+const HIGHLIGHT_RULE: ShowFn<HighlightElem> = |elem, _, styles| {
+ Ok(elem.body.clone().set(
+ TextElem::deco,
+ smallvec![Decoration {
+ line: DecoLine::Highlight {
+ fill: elem.fill.get_cloned(styles),
+ stroke: elem
+ .stroke
+ .resolve(styles)
+ .unwrap_or_default()
+ .map(|stroke| stroke.map(Stroke::unwrap_or_default)),
+ top_edge: elem.top_edge.get(styles),
+ bottom_edge: elem.bottom_edge.get(styles),
+ radius: elem.radius.resolve(styles).unwrap_or_default(),
+ },
+ extent: elem.extent.resolve(styles),
+ }],
+ ))
+};
+
+const SMALLCAPS_RULE: ShowFn<SmallcapsElem> = |elem, _, styles| {
+ let sc = if elem.all.get(styles) { Smallcaps::All } else { Smallcaps::Minuscules };
+ Ok(elem.body.clone().set(TextElem::smallcaps, Some(sc)))
+};
+
+const RAW_RULE: ShowFn<RawElem> = |elem, _, styles| {
+ let lines = elem.lines.as_deref().unwrap_or_default();
+
+ let mut seq = EcoVec::with_capacity((2 * lines.len()).saturating_sub(1));
+ for (i, line) in lines.iter().enumerate() {
+ if i != 0 {
+ seq.push(LinebreakElem::shared().clone());
+ }
+
+ seq.push(line.clone().pack());
+ }
+
+ let mut realized = Content::sequence(seq);
+
+ if elem.block.get(styles) {
+ // Align the text before inserting it into the block.
+ realized = realized.aligned(elem.align.get(styles).into());
+ realized = BlockElem::new()
+ .with_body(Some(BlockBody::Content(realized)))
+ .pack()
+ .spanned(elem.span());
+ }
+
+ Ok(realized)
+};
+
+const RAW_LINE_RULE: ShowFn<RawLine> = |elem, _, _| Ok(elem.body.clone());
+
+const ALIGN_RULE: ShowFn<AlignElem> =
+ |elem, _, styles| Ok(elem.body.clone().aligned(elem.alignment.get(styles)));
+
+const PAD_RULE: ShowFn<PadElem> = |elem, _, _| {
+ Ok(BlockElem::multi_layouter(elem.clone(), crate::pad::layout_pad)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const COLUMNS_RULE: ShowFn<ColumnsElem> = |elem, _, _| {
+ Ok(BlockElem::multi_layouter(elem.clone(), crate::flow::layout_columns)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const STACK_RULE: ShowFn<StackElem> = |elem, _, _| {
+ Ok(BlockElem::multi_layouter(elem.clone(), crate::stack::layout_stack)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const GRID_RULE: ShowFn<GridElem> = |elem, _, _| {
+ Ok(BlockElem::multi_layouter(elem.clone(), crate::grid::layout_grid)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const GRID_CELL_RULE: ShowFn<GridCell> = |elem, _, styles| {
+ show_cell(elem.body.clone(), elem.inset.get(styles), elem.align.get(styles))
+};
+
+/// Function with common code to display a grid cell or table cell.
+fn show_cell(
+ mut body: Content,
+ inset: Smart<Sides<Option<Rel<Length>>>>,
+ align: Smart<Alignment>,
+) -> SourceResult<Content> {
+ let inset = inset.unwrap_or_default().map(Option::unwrap_or_default);
+
+ if inset != Sides::default() {
+ // Only pad if some inset is not 0pt.
+ // Avoids a bug where using .padded() in any way inside Show causes
+ // alignment in align(...) to break.
+ body = body.padded(inset);
+ }
+
+ if let Smart::Custom(alignment) = align {
+ body = body.aligned(alignment);
+ }
+
+ Ok(body)
+}
+
+const MOVE_RULE: ShowFn<MoveElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::transforms::layout_move)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const SCALE_RULE: ShowFn<ScaleElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::transforms::layout_scale)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const ROTATE_RULE: ShowFn<RotateElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::transforms::layout_rotate)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const SKEW_RULE: ShowFn<SkewElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::transforms::layout_skew)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const REPEAT_RULE: ShowFn<RepeatElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::repeat::layout_repeat)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const HIDE_RULE: ShowFn<HideElem> =
+ |elem, _, _| Ok(elem.body.clone().set(HideElem::hidden, true));
+
+const LAYOUT_RULE: ShowFn<LayoutElem> = |elem, _, _| {
+ Ok(BlockElem::multi_layouter(
+ elem.clone(),
+ |elem, engine, locator, styles, regions| {
+ // Gets the current region's base size, which will be the size of the
+ // outer container, or of the page if there is no such container.
+ let Size { x, y } = regions.base();
+ let loc = elem.location().unwrap();
+ let context = Context::new(Some(loc), Some(styles));
+ let result = elem
+ .func
+ .call(engine, context.track(), [dict! { "width" => x, "height" => y }])?
+ .display();
+ crate::flow::layout_fragment(engine, &result, locator, styles, regions)
+ },
+ )
+ .pack()
+ .spanned(elem.span()))
+};
+
+const IMAGE_RULE: ShowFn<ImageElem> = |elem, _, styles| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::image::layout_image)
+ .with_width(elem.width.get(styles))
+ .with_height(elem.height.get(styles))
+ .pack()
+ .spanned(elem.span()))
+};
+
+const LINE_RULE: ShowFn<LineElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_line)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const RECT_RULE: ShowFn<RectElem> = |elem, _, styles| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_rect)
+ .with_width(elem.width.get(styles))
+ .with_height(elem.height.get(styles))
+ .pack()
+ .spanned(elem.span()))
+};
+
+const SQUARE_RULE: ShowFn<SquareElem> = |elem, _, styles| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_square)
+ .with_width(elem.width.get(styles))
+ .with_height(elem.height.get(styles))
+ .pack()
+ .spanned(elem.span()))
+};
+
+const ELLIPSE_RULE: ShowFn<EllipseElem> = |elem, _, styles| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_ellipse)
+ .with_width(elem.width.get(styles))
+ .with_height(elem.height.get(styles))
+ .pack()
+ .spanned(elem.span()))
+};
+
+const CIRCLE_RULE: ShowFn<CircleElem> = |elem, _, styles| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_circle)
+ .with_width(elem.width.get(styles))
+ .with_height(elem.height.get(styles))
+ .pack()
+ .spanned(elem.span()))
+};
+
+const POLYGON_RULE: ShowFn<PolygonElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_polygon)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const CURVE_RULE: ShowFn<CurveElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_curve)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const PATH_RULE: ShowFn<PathElem> = |elem, _, _| {
+ Ok(BlockElem::single_layouter(elem.clone(), crate::shapes::layout_path)
+ .pack()
+ .spanned(elem.span()))
+};
+
+const EQUATION_RULE: ShowFn<EquationElem> = |elem, _, styles| {
+ if elem.block.get(styles) {
+ Ok(BlockElem::multi_layouter(elem.clone(), crate::math::layout_equation_block)
+ .pack()
+ .spanned(elem.span()))
+ } else {
+ Ok(InlineElem::layouter(elem.clone(), crate::math::layout_equation_inline)
+ .pack()
+ .spanned(elem.span()))
+ }
+};
+
+const EMBED_RULE: ShowFn<EmbedElem> = |_, _, _| Ok(Content::empty());
generated by cgit v1.2.3 (git 2.25.1) at 2026-03-15 16:30:58 +0000