Return SourceResult in try_new

crates/typst-layout/src/math/accent.rs

@@ -42,7 +42,8 @@ pub fn layout_accent(
         styles
     };
 
-    let mut glyph = GlyphFragment::new(ctx.font, accent_styles, accent.0, elem.span());
+    let mut glyph =
+        GlyphFragment::new_char(ctx.font, accent_styles, accent.0, elem.span())?;
 
     // Forcing the accent to be at least as large as the base makes it too wide
     // in many cases.

crates/typst-layout/src/math/frac.rs

@@ -109,12 +109,12 @@ fn layout_frac_like(
     frame.push_frame(denom_pos, denom);
 
     if binom {
-        let mut left = GlyphFragment::new(ctx.font, styles, '(', span);
+        let mut left = GlyphFragment::new_char(ctx.font, styles, '(', span)?;
         left.stretch_vertical(ctx, height - short_fall);
         left.center_on_axis();
         ctx.push(left);
         ctx.push(FrameFragment::new(styles, frame));
-        let mut right = GlyphFragment::new(ctx.font, styles, ')', span);
+        let mut right = GlyphFragment::new_char(ctx.font, styles, ')', span)?;
         right.stretch_vertical(ctx, height - short_fall);
         right.center_on_axis();
         ctx.push(right);

crates/typst-layout/src/math/fragment.rs

@@ -4,7 +4,7 @@ use az::SaturatingAs;
 use rustybuzz::{BufferFlags, UnicodeBuffer};
 use ttf_parser::math::{GlyphAssembly, GlyphConstruction, GlyphPart};
 use ttf_parser::GlyphId;
-use typst_library::diag::warning;
+use typst_library::diag::{bail, warning, SourceResult};
 use typst_library::foundations::StyleChain;
 use typst_library::introspection::Tag;
 use typst_library::layout::{
@@ -258,21 +258,25 @@ pub struct GlyphFragment {
 }
 
 impl GlyphFragment {
-    /// Calls `try_new` with the given character, assuming the font has a glyph
+    /// Calls `new` with the given character.
-    /// for it.
+    pub fn new_char(
-    pub fn new(font: &Font, styles: StyleChain, c: char, span: Span) -> Self {
+        font: &Font,
-        Self::try_new(font, styles, c.encode_utf8(&mut [0; 4]), span).unwrap()
+        styles: StyleChain,
+        c: char,
+        span: Span,
+    ) -> SourceResult<Self> {
+        Self::new(font, styles, c.encode_utf8(&mut [0; 4]), span)
     }
 
-    /// Try to create a new glyph out of the given string. Will return None if
+    /// Try to create a new glyph out of the given string. Will bail if the
-    /// the result from shaping the string is not a single glyph or is a tofu.
+    /// result from shaping the string is not a single glyph or is a tofu.
     #[comemo::memoize]
-    pub fn try_new(
+    pub fn new(
         font: &Font,
         styles: StyleChain,
         text: &str,
         span: Span,
-    ) -> Option<GlyphFragment> {
+    ) -> SourceResult<GlyphFragment> {
         let mut buffer = UnicodeBuffer::new();
         buffer.push_str(text);
         buffer.set_language(language(styles));
@@ -296,7 +300,7 @@ impl GlyphFragment {
 
         let buffer = rustybuzz::shape_with_plan(font.rusty(), &plan, buffer);
         if buffer.len() != 1 {
-            return None;
+            bail!(span, "did not get a single glyph after shaping {}", text);
         }
 
         let info = buffer.glyph_infos()[0];
@@ -304,7 +308,7 @@ impl GlyphFragment {
 
         // TODO: add support for coverage and fallback, like in normal text shaping.
         if info.glyph_id == 0 {
-            return None;
+            bail!(span, "current font is missing a glyph for {}", text);
         }
 
         let cluster = info.cluster as usize;
@@ -353,7 +357,7 @@ impl GlyphFragment {
             modifiers: FrameModifiers::get_in(styles),
         };
         fragment.update_glyph();
-        Some(fragment)
+        Ok(fragment)
     }
 
     /// Sets element id and boxes in appropriate way without changing other

crates/typst-layout/src/math/mat.rs

@@ -183,8 +183,12 @@ fn layout_body(
     // We pad ascent and descent with the ascent and descent of the paren
     // to ensure that normal matrices are aligned with others unless they are
     // way too big.
-    let paren =
+    let paren = GlyphFragment::new_char(
-        GlyphFragment::new(ctx.font, styles.chain(&denom_style), '(', Span::detached());
+        ctx.font,
+        styles.chain(&denom_style),
+        '(',
+        Span::detached(),
+    )?;
 
     for (column, col) in columns.iter().zip(&mut cols) {
         for (cell, (ascent, descent)) in column.iter().zip(&mut heights) {
@@ -313,7 +317,7 @@ fn layout_delimiters(
     frame.set_baseline(height / 2.0 + axis);
 
     if let Some(left_c) = left {
-        let mut left = GlyphFragment::new(ctx.font, styles, left_c, span);
+        let mut left = GlyphFragment::new_char(ctx.font, styles, left_c, span)?;
         left.stretch_vertical(ctx, target - short_fall);
         left.center_on_axis();
         ctx.push(left);
@@ -322,7 +326,7 @@ fn layout_delimiters(
     ctx.push(FrameFragment::new(styles, frame));
 
     if let Some(right_c) = right {
-        let mut right = GlyphFragment::new(ctx.font, styles, right_c, span);
+        let mut right = GlyphFragment::new_char(ctx.font, styles, right_c, span)?;
         right.stretch_vertical(ctx, target - short_fall);
         right.center_on_axis();
         ctx.push(right);

crates/typst-layout/src/math/root.rs

@@ -49,7 +49,7 @@ pub fn layout_root(
 
     // Layout root symbol.
     let target = radicand.height() + thickness + gap;
-    let mut sqrt = GlyphFragment::new(ctx.font, styles, '√', span);
+    let mut sqrt = GlyphFragment::new_char(ctx.font, styles, '√', span)?;
     sqrt.stretch_vertical(ctx, target);
     let sqrt = sqrt.into_frame();
 

crates/typst-layout/src/math/text.rs

@@ -70,7 +70,7 @@ fn layout_inline_text(
         let mut fragments = vec![];
         for unstyled_c in text.chars() {
             let c = styled_char(styles, unstyled_c, false);
-            let glyph = GlyphFragment::new(ctx.font, styles, c, span);
+            let glyph = GlyphFragment::new_char(ctx.font, styles, c, span)?;
             fragments.push(glyph.into());
         }
         let frame = MathRun::new(fragments).into_frame(styles);
@@ -125,19 +125,15 @@ pub fn layout_symbol(
         _ => (elem.text, styles),
     };
     let c = styled_char(styles, unstyled_c, true);
-    let fragment: MathFragment = match GlyphFragment::try_new(
+    let fragment: MathFragment =
-        ctx.font,
+        match GlyphFragment::new_char(ctx.font, symbol_styles, c, elem.span()) {
-        symbol_styles,
+            Ok(mut glyph) => {
-        c.encode_utf8(&mut [0; 4]),
-        elem.span(),
-    ) {
-        Some(mut glyph) => {
                 adjust_glyph_layout(&mut glyph, ctx, styles);
                 glyph.into()
             }
-        None => {
+            Err(_) => {
                 // Not in the math font, fallback to normal inline text layout.
-            // TODO: Should replace this with proper fallback in [`GlyphFragment::try_new`].
+                // TODO: Should replace this with proper fallback in [`GlyphFragment::new`].
                 layout_inline_text(c.encode_utf8(&mut [0; 4]), elem.span(), ctx, styles)?
                     .into()
             }

crates/typst-layout/src/math/underover.rs

@@ -285,7 +285,7 @@ fn layout_underoverspreader(
     let body = ctx.layout_into_run(body, styles)?;
     let body_class = body.class();
     let body = body.into_fragment(styles);
-    let mut glyph = GlyphFragment::new(ctx.font, styles, c, span);
+    let mut glyph = GlyphFragment::new_char(ctx.font, styles, c, span)?;
     glyph.stretch_horizontal(ctx, body.width());
 
     let mut rows = vec![];