A few math fixes

library/src/math/mod.rs

@@ -61,7 +61,8 @@ impl Layout for MathNode {
     ) -> SourceResult<Fragment> {
         let mut t = Texifier::new(styles);
         self.texify(&mut t)?;
-        layout_tex(vt, &t.finish(), self.display, styles)
+        Ok(layout_tex(vt, &t.finish(), self.display, styles)
+            .unwrap_or(Fragment::frame(Frame::new(Size::zero()))))
     }
 }
 

library/src/math/tex.rs

@@ -14,7 +14,7 @@ pub fn layout_tex(
     tex: &str,
     display: bool,
     styles: StyleChain,
-) -> SourceResult<Fragment> {
+) -> Result<Fragment, &'static str> {
     // Load the font.
     let variant = variant(styles);
     let world = vt.world();
@@ -27,11 +27,13 @@ pub fn layout_tex(
     }
 
     // Prepare the font context.
-    let font = font.expect("failed to find suitable math font");
+    let Some(font) = font else { return Err("failed to find suitable math font") };
-    let ctx = font
+    let Some(ctx) = font
         .math()
         .map(|math| FontContext::new(font.ttf(), math))
-        .expect("failed to create font context");
+    else {
+        return Err("failed to create math font context");
+    };
 
     // Layout the formula.
     let em = styles.get(TextNode::SIZE);
@@ -45,7 +47,7 @@ pub fn layout_tex(
             Error::Layout(LayoutError::Font(err)) => err.to_string(),
         })
     else {
-        panic!("failed to layout with rex: {tex}");
+        return Err("failed to layout math");
     };
 
     // Determine the metrics.

src/syntax/kind.rs

@@ -405,7 +405,15 @@ impl SyntaxKind {
             Self::EnumNumbering(_) => "enumeration item numbering",
             Self::DescItem => "description list item",
             Self::Math => "math formula",
-            Self::Atom(_) => "math atom",
+            Self::Atom(s) => match s.as_str() {
+                "(" => "opening paren",
+                ")" => "closing paren",
+                "{" => "opening brace",
+                "}" => "closing brace",
+                "[" => "opening bracket",
+                "]" => "closing bracket",
+                _ => "math atom",
+            },
             Self::Script => "script",
             Self::Frac => "fraction",
             Self::AlignPoint => "alignment point",

src/syntax/parser.rs

@@ -338,9 +338,13 @@ impl<'s> Parser<'s> {
             Some(SyntaxKind::RightParen) => self.inside(Group::Paren),
             Some(SyntaxKind::Star) => self.inside(Group::Strong),
             Some(SyntaxKind::Underscore) => self.inside(Group::Emph),
-            Some(SyntaxKind::Dollar) => {
+            Some(SyntaxKind::Dollar) => self
-                self.groups.last().map(|group| group.kind) == Some(Group::Math)
+                .groups
-            }
+                .iter()
+                .rev()
+                .skip_while(|group| matches!(group.kind, Group::MathRow(..)))
+                .next()
+                .map_or(false, |group| group.kind == Group::Math),
             Some(SyntaxKind::Semicolon) => self.inside(Group::Expr),
             Some(SyntaxKind::From) => self.inside(Group::Imports),
             Some(SyntaxKind::Atom(s)) => match s.as_str() {

tests/typ/math/syntax.typ

@@ -22,3 +22,7 @@ $ 1 + 2 = #{1 + 2} $
 $ A sub:eq:not B $
 ```
 <table>
+
+---
+// Error: 8 expected closing paren
+$ sum_( $