Overline, Underline, Overbracket, Underbracket

5 files changed, 324 insertions, 171 deletions

diff --git a/library/src/math/braced.rs b/library/src/math/braced.rs
deleted file mode 100644
index e207cb92..00000000
--- a/library/src/math/braced.rs
+++ /dev/null
@@ -1,123 +0,0 @@
-use super::*;
-
-const BRACED_GAP: Em = Em::new(0.3);
-
-/// # Underbrace
-/// A horizontal brace under content, with an optional annotation below.
-///
-/// ## Example
-/// ```
-/// $ underbrace(1 + 2 + ... + 5, "numbers") $
-/// ```
-///
-/// ## Parameters
-/// - body: Content (positional, required)
-///   The content above the brace.
-///
-/// - annotation: Content (positional)
-///   The optional content below the brace.
-///
-/// ## Category
-/// math
-#[func]
-#[capable(LayoutMath)]
-#[derive(Debug, Hash)]
-pub struct UnderbraceNode {
-    /// The content above the brace.
-    pub body: Content,
-    /// The optional content below the brace.
-    pub annotation: Option<Content>,
-}
-
-#[node]
-impl UnderbraceNode {
-    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
-        let body = args.expect("body")?;
-        let annotation = args.eat()?;
-        Ok(Self { body, annotation }.pack())
-    }
-}
-
-impl LayoutMath for UnderbraceNode {
-    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
-        let gap = BRACED_GAP.scaled(ctx);
-        let body = ctx.layout_row(&self.body)?;
-        let glyph = GlyphFragment::new(ctx, '⏟');
-        let brace = glyph.stretch_horizontal(ctx, body.width(), Abs::zero());
-
-        let mut rows = vec![body, brace.into()];
-        ctx.style(ctx.style.for_subscript());
-        rows.extend(
-            self.annotation
-                .as_ref()
-                .map(|annotation| ctx.layout_row(annotation))
-                .transpose()?,
-        );
-        ctx.unstyle();
-        ctx.push(stack(ctx, rows, Align::Center, gap, 0));
-
-        Ok(())
-    }
-}
-
-/// # Overbrace
-/// A horizontal brace over content, with an optional annotation above.
-///
-/// ## Example
-/// ```
-/// $ overbrace(1 + 2 + ... + 5, "numbers") $
-/// ```
-///
-/// ## Parameters
-/// - body: Content (positional, required)
-///   The content below the brace.
-///
-/// - annotation: Content (positional)
-///   The optional content above the brace.
-///
-/// ## Category
-/// math
-#[func]
-#[capable(LayoutMath)]
-#[derive(Debug, Hash)]
-pub struct OverbraceNode {
-    /// The content below the brace.
-    pub body: Content,
-    /// The optional content above the brace.
-    pub annotation: Option<Content>,
-}
-
-#[node]
-impl OverbraceNode {
-    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
-        let body = args.expect("body")?;
-        let annotation = args.eat()?;
-        Ok(Self { body, annotation }.pack())
-    }
-}
-
-impl LayoutMath for OverbraceNode {
-    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
-        let gap = BRACED_GAP.scaled(ctx);
-        let body = ctx.layout_row(&self.body)?;
-        let glyph = GlyphFragment::new(ctx, '⏞');
-        let brace = glyph.stretch_horizontal(ctx, body.width(), Abs::zero());
-
-        let mut rows = vec![];
-        ctx.style(ctx.style.for_superscript());
-        rows.extend(
-            self.annotation
-                .as_ref()
-                .map(|annotation| ctx.layout_row(annotation))
-                .transpose()?,
-        );
-        ctx.unstyle();
-        rows.push(brace.into());
-        rows.push(body);
-
-        let last = rows.len() - 1;
-        ctx.push(stack(ctx, rows, Align::Center, gap, last));
-
-        Ok(())
-    }
-}
diff --git a/library/src/math/matrix.rs b/library/src/math/matrix.rs
index 27e1b282..45ebdda7 100644
--- a/library/src/math/matrix.rs
+++ b/library/src/math/matrix.rs
@@ -172,61 +172,20 @@ fn layout(
 
     let mut frame = stack(ctx, rows, align, gap, 0);
     let height = frame.height();
+    let target = height + VERTICAL_PADDING.of(height);
     frame.set_baseline(frame.height() / 2.0 + axis);
 
     if let Some(left) = left {
-        ctx.push(GlyphFragment::new(ctx, left).stretch_vertical(ctx, height, short_fall));
+        ctx.push(GlyphFragment::new(ctx, left).stretch_vertical(ctx, target, short_fall));
     }
 
     ctx.push(frame);
 
     if let Some(right) = right {
         ctx.push(
-            GlyphFragment::new(ctx, right).stretch_vertical(ctx, height, short_fall),
+            GlyphFragment::new(ctx, right).stretch_vertical(ctx, target, short_fall),
         );
     }
 
     Ok(())
 }
-
-/// Stack rows on top of each other.
-///
-/// Add a `gap` between each row and uses the baseline of the `baseline`th
-/// row for the whole frame.
-pub(super) fn stack(
-    ctx: &MathContext,
-    rows: Vec<MathRow>,
-    align: Align,
-    gap: Abs,
-    baseline: usize,
-) -> Frame {
-    let mut width = Abs::zero();
-    let mut height = rows.len().saturating_sub(1) as f64 * gap;
-
-    let points = alignments(&rows);
-    let rows: Vec<_> =
-        rows.into_iter().map(|row| row.to_line_frame(ctx, &points)).collect();
-
-    for row in &rows {
-        height += row.height();
-        width.set_max(row.width());
-    }
-
-    let extra = VERTICAL_PADDING.of(height);
-    height += extra;
-
-    let mut y = extra / 2.0;
-    let mut frame = Frame::new(Size::new(width, height));
-
-    for (i, row) in rows.into_iter().enumerate() {
-        let x = align.position(width - row.width());
-        let pos = Point::new(x, y);
-        if i == baseline {
-            frame.set_baseline(y + row.baseline());
-        }
-        y += row.height() + gap;
-        frame.push_frame(pos, row);
-    }
-
-    frame
-}
diff --git a/library/src/math/mod.rs b/library/src/math/mod.rs
index 4c002cea..2d914c31 100644
--- a/library/src/math/mod.rs
+++ b/library/src/math/mod.rs
@@ -5,7 +5,6 @@ mod ctx;
 mod accent;
 mod align;
 mod attach;
-mod braced;
 mod frac;
 mod fragment;
 mod lr;
@@ -14,6 +13,7 @@ mod op;
 mod root;
 mod row;
 mod spacing;
+mod stack;
 mod stretch;
 mod style;
 mod symbols;
@@ -21,12 +21,12 @@ mod symbols;
 pub use self::accent::*;
 pub use self::align::*;
 pub use self::attach::*;
-pub use self::braced::*;
 pub use self::frac::*;
 pub use self::lr::*;
 pub use self::matrix::*;
 pub use self::op::*;
 pub use self::root::*;
+pub use self::stack::*;
 pub use self::style::*;
 
 use ttf_parser::GlyphId;
@@ -65,8 +65,12 @@ pub fn module(sym: &Module) -> Module {
     math.def_func::<ScriptsNode>("scripts");
     math.def_func::<LimitsNode>("limits");
     math.def_func::<AccentNode>("accent");
+    math.def_func::<UnderlineNode>("underline");
+    math.def_func::<OverlineNode>("overline");
     math.def_func::<UnderbraceNode>("underbrace");
     math.def_func::<OverbraceNode>("overbrace");
+    math.def_func::<UnderbracketNode>("underbracket");
+    math.def_func::<OverbracketNode>("overbracket");
 
     // Fractions and matrix-likes.
     math.def_func::<FracNode>("frac");
diff --git a/library/src/math/stack.rs b/library/src/math/stack.rs
new file mode 100644
index 00000000..c8a1252c
--- /dev/null
+++ b/library/src/math/stack.rs
@@ -0,0 +1,315 @@
+use super::*;
+
+const LINE_GAP: Em = Em::new(0.15);
+const BRACE_GAP: Em = Em::new(0.25);
+const BRACKET_GAP: Em = Em::new(0.25);
+
+/// # Underline
+/// A horizontal line under content.
+///
+/// ## Example
+/// ```
+/// $ underline(1 + 2 + ... + 5) $
+/// ```
+///
+/// ## Parameters
+/// - body: Content (positional, required)
+///   The content above the line.
+///
+/// ## Category
+/// math
+#[func]
+#[capable(LayoutMath)]
+#[derive(Debug, Hash)]
+pub struct UnderlineNode(Content);
+
+#[node]
+impl UnderlineNode {
+    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
+        Ok(Self(args.expect("body")?).pack())
+    }
+}
+
+impl LayoutMath for UnderlineNode {
+    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
+        layout(ctx, &self.0, &None, '\u{305}', LINE_GAP, false)
+    }
+}
+
+/// # Overline
+/// A horizontal line over content.
+///
+/// ## Example
+/// ```
+/// $ overline(1 + 2 + ... + 5) $
+/// ```
+///
+/// ## Parameters
+/// - body: Content (positional, required)
+///   The content below the line.
+///
+/// ## Category
+/// math
+#[func]
+#[capable(LayoutMath)]
+#[derive(Debug, Hash)]
+pub struct OverlineNode(Content);
+
+#[node]
+impl OverlineNode {
+    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
+        Ok(Self(args.expect("body")?).pack())
+    }
+}
+
+impl LayoutMath for OverlineNode {
+    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
+        layout(ctx, &self.0, &None, '\u{332}', LINE_GAP, true)
+    }
+}
+
+/// # Underbrace
+/// A horizontal brace under content, with an optional annotation below.
+///
+/// ## Example
+/// ```
+/// $ underbrace(1 + 2 + ... + 5, "numbers") $
+/// ```
+///
+/// ## Parameters
+/// - body: Content (positional, required)
+///   The content above the brace.
+///
+/// - annotation: Content (positional)
+///   The optional content below the brace.
+///
+/// ## Category
+/// math
+#[func]
+#[capable(LayoutMath)]
+#[derive(Debug, Hash)]
+pub struct UnderbraceNode {
+    /// The content above the brace.
+    pub body: Content,
+    /// The optional content below the brace.
+    pub annotation: Option<Content>,
+}
+
+#[node]
+impl UnderbraceNode {
+    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
+        let body = args.expect("body")?;
+        let annotation = args.eat()?;
+        Ok(Self { body, annotation }.pack())
+    }
+}
+
+impl LayoutMath for UnderbraceNode {
+    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
+        layout(ctx, &self.body, &self.annotation, '⏟', BRACE_GAP, false)
+    }
+}
+
+/// # Overbrace
+/// A horizontal brace over content, with an optional annotation above.
+///
+/// ## Example
+/// ```
+/// $ overbrace(1 + 2 + ... + 5, "numbers") $
+/// ```
+///
+/// ## Parameters
+/// - body: Content (positional, required)
+///   The content below the brace.
+///
+/// - annotation: Content (positional)
+///   The optional content above the brace.
+///
+/// ## Category
+/// math
+#[func]
+#[capable(LayoutMath)]
+#[derive(Debug, Hash)]
+pub struct OverbraceNode {
+    /// The content below the brace.
+    pub body: Content,
+    /// The optional content above the brace.
+    pub annotation: Option<Content>,
+}
+
+#[node]
+impl OverbraceNode {
+    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
+        let body = args.expect("body")?;
+        let annotation = args.eat()?;
+        Ok(Self { body, annotation }.pack())
+    }
+}
+
+impl LayoutMath for OverbraceNode {
+    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
+        layout(ctx, &self.body, &self.annotation, '⏞', BRACE_GAP, true)
+    }
+}
+
+/// # Underbracket
+/// A horizontal bracket under content, with an optional annotation below.
+///
+/// ## Example
+/// ```
+/// $ underbracket(1 + 2 + ... + 5, "numbers") $
+/// ```
+///
+/// ## Parameters
+/// - body: Content (positional, required)
+///   The content above the bracket.
+///
+/// - annotation: Content (positional)
+///   The optional content below the bracket.
+///
+/// ## Category
+/// math
+#[func]
+#[capable(LayoutMath)]
+#[derive(Debug, Hash)]
+pub struct UnderbracketNode {
+    /// The content above the bracket.
+    pub body: Content,
+    /// The optional content below the bracket.
+    pub annotation: Option<Content>,
+}
+
+#[node]
+impl UnderbracketNode {
+    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
+        let body = args.expect("body")?;
+        let annotation = args.eat()?;
+        Ok(Self { body, annotation }.pack())
+    }
+}
+
+impl LayoutMath for UnderbracketNode {
+    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
+        layout(ctx, &self.body, &self.annotation, '⎵', BRACKET_GAP, false)
+    }
+}
+
+/// # Overbracket
+/// A horizontal bracket over content, with an optional annotation above.
+///
+/// ## Example
+/// ```
+/// $ overbracket(1 + 2 + ... + 5, "numbers") $
+/// ```
+///
+/// ## Parameters
+/// - body: Content (positional, required)
+///   The content below the bracket.
+///
+/// - annotation: Content (positional)
+///   The optional content above the bracket.
+///
+/// ## Category
+/// math
+#[func]
+#[capable(LayoutMath)]
+#[derive(Debug, Hash)]
+pub struct OverbracketNode {
+    /// The content below the bracket.
+    pub body: Content,
+    /// The optional content above the bracket.
+    pub annotation: Option<Content>,
+}
+
+#[node]
+impl OverbracketNode {
+    fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
+        let body = args.expect("body")?;
+        let annotation = args.eat()?;
+        Ok(Self { body, annotation }.pack())
+    }
+}
+
+impl LayoutMath for OverbracketNode {
+    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
+        layout(ctx, &self.body, &self.annotation, '⎴', BRACKET_GAP, true)
+    }
+}
+
+/// Layout an over- or underthing.
+fn layout(
+    ctx: &mut MathContext,
+    body: &Content,
+    annotation: &Option<Content>,
+    c: char,
+    gap: Em,
+    reverse: bool,
+) -> SourceResult<()> {
+    let gap = gap.scaled(ctx);
+    let body = ctx.layout_row(body)?;
+    let glyph = GlyphFragment::new(ctx, c);
+    let stretched = glyph.stretch_horizontal(ctx, body.width(), Abs::zero());
+
+    let mut rows = vec![body, stretched.into()];
+    ctx.style(if reverse {
+        ctx.style.for_subscript()
+    } else {
+        ctx.style.for_superscript()
+    });
+    rows.extend(
+        annotation
+            .as_ref()
+            .map(|annotation| ctx.layout_row(annotation))
+            .transpose()?,
+    );
+    ctx.unstyle();
+
+    let mut baseline = 0;
+    if reverse {
+        rows.reverse();
+        baseline = rows.len() - 1;
+    }
+
+    ctx.push(stack(ctx, rows, Align::Center, gap, baseline));
+
+    Ok(())
+}
+
+/// Stack rows on top of each other.
+///
+/// Add a `gap` between each row and uses the baseline of the `baseline`th
+/// row for the whole frame.
+pub(super) fn stack(
+    ctx: &MathContext,
+    rows: Vec<MathRow>,
+    align: Align,
+    gap: Abs,
+    baseline: usize,
+) -> Frame {
+    let mut width = Abs::zero();
+    let mut height = rows.len().saturating_sub(1) as f64 * gap;
+
+    let points = alignments(&rows);
+    let rows: Vec<_> =
+        rows.into_iter().map(|row| row.to_line_frame(ctx, &points)).collect();
+
+    for row in &rows {
+        height += row.height();
+        width.set_max(row.width());
+    }
+
+    let mut y = Abs::zero();
+    let mut frame = Frame::new(Size::new(width, height));
+
+    for (i, row) in rows.into_iter().enumerate() {
+        let x = align.position(width - row.width());
+        let pos = Point::new(x, y);
+        if i == baseline {
+            frame.set_baseline(y + row.baseline());
+        }
+        y += row.height() + gap;
+        frame.push_frame(pos, row);
+    }
+
+    frame
+}
diff --git a/library/src/text/symbols.rs b/library/src/text/symbols.rs
index 36e49849..8bc6222a 100644
--- a/library/src/text/symbols.rs
+++ b/library/src/text/symbols.rs
@@ -150,13 +150,11 @@ symbols! {
     breve: '˘',
     caret: '‸',
     caron: 'ˇ',
-    cedilla: '¸',
     circum: '^',
     diaer: '¨',
     grave: '`',
     macron: '¯',
     tilde: '~',
-    overline: '‾',
 
     // Currency.
     bitcoin: '₿',