From c1e853cc7d92ff489294b992827031ca3a42f9b7 Mon Sep 17 00:00:00 2001
From: Reinier Hartog <me@rmhartog.me>
Date: Tue, 21 May 2024 11:36:15 +0200
Subject: [PATCH] fix: ignore invalid escape sequences in doc text

---
 packages/compiler/src/core/scanner.ts | 28 ++++++++++++++++++++++++++-
 packages/compiler/test/parser.test.ts | 24 +++++++++++------------
 2 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/packages/compiler/src/core/scanner.ts b/packages/compiler/src/core/scanner.ts
index f245b4f742..d4acda5b92 100644
--- a/packages/compiler/src/core/scanner.ts
+++ b/packages/compiler/src/core/scanner.ts
@@ -1044,7 +1044,33 @@ export function createScanner(
 
   function getDocTextValue(): string {
     if (tokenFlags & TokenFlags.Escaped) {
-      return unescapeString(tokenPosition, position);
+      let start = tokenPosition;
+      const end = position;
+
+      let result = "";
+      let pos = start;
+
+      while (pos < end) {
+        const ch = input.charCodeAt(pos);
+        if (ch !== CharCode.Backslash) {
+          pos++;
+          continue;
+        }
+
+        result += input.substring(start, pos);
+        switch (input.charCodeAt(pos + 1)) {
+          case CharCode.At:
+            result += "@";
+            break;
+          default:
+            result += input.substring(pos, pos + 2);
+        }
+        pos += 2;
+        start = pos;
+      }
+
+      result += input.substring(start, pos);
+      return result;
     } else {
       return input.substring(tokenPosition, position);
     }
diff --git a/packages/compiler/test/parser.test.ts b/packages/compiler/test/parser.test.ts
index 94d802e49c..e9e551d70c 100644
--- a/packages/compiler/test/parser.test.ts
+++ b/packages/compiler/test/parser.test.ts
@@ -1045,18 +1045,18 @@ describe("compiler: parser", () => {
             strictEqual(
               docs[0].content[0].text,
               "This one has a `code span` and a code fence and it spreads over\n" +
-              "more than one line.\n\n" +
-              "```\n" +
-              "This is not a @tag because we're in a code fence.\n" +
-              "  This is indented code.\n" +
-              "```\n\n" +
-              "```\n" +
-              "This code fence is glued\n" +
-              "to the stars\n" +
-              "```\n\n" +
-              "`This is not a @tag either because we're in a code span`.\n" + 
-              "\n" + 
-              "This is not a @tag because it is escaped."
+                "more than one line.\n\n" +
+                "```\n" +
+                "This is not a @tag because we're in a code fence.\n" +
+                "  This is indented code.\n" +
+                "```\n\n" +
+                "```\n" +
+                "This code fence is glued\n" +
+                "to the stars\n" +
+                "```\n\n" +
+                "`This is not a @tag either because we're in a code span`.\n" +
+                "\n" +
+                "This is not a @tag because it is escaped."
             );
             strictEqual(docs[0].tags.length, 6);
             const [xParam, yParam, tTemplate, uTemplate, returns, pretend] = docs[0].tags;