From d3f27aded88764d43892bb074815fd8fc089bf4c Mon Sep 17 00:00:00 2001
From: Rodrigo Pombo <pombopombopombo@gmail.com>
Date: Fri, 7 Jan 2022 22:39:29 +0100
Subject: [PATCH] Fix annotation regex

---
 packages/mdx/src/plugin/annotations.ts              | 12 ++++++++----
 packages/playground/content/comment-annotations.mdx |  3 +++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/packages/mdx/src/plugin/annotations.ts b/packages/mdx/src/plugin/annotations.ts
index 23b53fdf..62e5daf3 100644
--- a/packages/mdx/src/plugin/annotations.ts
+++ b/packages/mdx/src/plugin/annotations.ts
@@ -50,6 +50,7 @@ export function extractAnnotationsFromCode(code: Code) {
   return [annotations, focusList.join(",")] as const
 }
 
+const commentRegex = /\/\/\s+(\w+)(\S*)\s*(.*)/
 function getCommentData(line: Code["lines"][0]) {
   const comment = line.tokens.find(t =>
     t.content.trim().startsWith("//")
@@ -59,10 +60,13 @@ function getCommentData(line: Code["lines"][0]) {
     return {}
   }
 
-  const commentRegex = /\/\/\s+(\w+)(\S*)\s*(.*)/
-  const [, key, focusString, data] = commentRegex.exec(
-    comment
-  )
+  const result = commentRegex.exec(comment)
+
+  if (!result) {
+    return {}
+  }
+
+  const [, key, focusString, data] = result
 
   return {
     key,
diff --git a/packages/playground/content/comment-annotations.mdx b/packages/playground/content/comment-annotations.mdx
index c7954b76..30d5aa99 100644
--- a/packages/playground/content/comment-annotations.mdx
+++ b/packages/playground/content/comment-annotations.mdx
@@ -42,6 +42,9 @@ function lorem(ipsum, dolor = 1) {
 }
 
 // this comment isn't an annotation
+//hello
+// 你好
+// å
 function adipiscing(...elit) {
   console.log(elit)
   // box[19:36] aqua