From e4f5385e35e69d4abd5df2cfbe5ea656a8423cf8 Mon Sep 17 00:00:00 2001
From: claude <claude@verso>
Date: Mon, 8 Jun 2026 06:54:56 +0000
Subject: [PATCH] fix(typst): fix zero-length token error for
 LineCommentContent

LineCommentContent { ![\n]* } matches the empty string, which Lezer
rejects as a zero-length token (infinite-loop risk). Change to ![\n]+
and mark it optional in the LineComment rule so empty // comments parse.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../js/features/source-editor/lezer-typst/typst.grammar       | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/services/web/frontend/js/features/source-editor/lezer-typst/typst.grammar b/services/web/frontend/js/features/source-editor/lezer-typst/typst.grammar
index 68c9db2ec6..142c822282 100644
--- a/services/web/frontend/js/features/source-editor/lezer-typst/typst.grammar
+++ b/services/web/frontend/js/features/source-editor/lezer-typst/typst.grammar
@@ -38,7 +38,7 @@ Heading { HeadingMark HeadingTitle? }
 // External tokens are context-isolated by the LR state machine — no merging.
 
 // ── Comments ──────────────────────────────────────────────────────────────
-LineComment { "//" LineCommentContent }
+LineComment { "//" LineCommentContent? }
 // BlockCommentBody is external so it can track nesting depth —
 // Typst supports /* /* nested */ */ block comments.
 BlockComment { "/*" BlockCommentBody? "*/" }
@@ -182,7 +182,7 @@ Escape { "\\" EscapeChar }
   }
 
   // Comment content — everything to end of line.
-  LineCommentContent { ![\n]* }
+  LineCommentContent { ![\n]+ }
 
   // Math content — everything between the $ delimiters (no crossing newlines).
   MathContent { ![$\n]+ }