From fe6a1e3d1cb92665b8a152fb0cf1686fb9e7ca25 Mon Sep 17 00:00:00 2001
From: Jos de Jong <wjosdejong@gmail.com>
Date: Mon, 13 Nov 2023 17:49:47 +0100
Subject: [PATCH] fix: crash when input ends with a truncated unicode character

---
 src/parse.test.ts | 10 +++++++++-
 src/parse.ts      |  6 +-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/parse.test.ts b/src/parse.test.ts
index ab64762..2c80eb7 100644
--- a/src/parse.test.ts
+++ b/src/parse.test.ts
@@ -388,7 +388,15 @@ describe('throw meaningful exceptions', () => {
     },
     { input: 'foo', expectedError: "JSON value expected but got 'f' at position 0" },
     { input: '"\\a"', expectedError: "Invalid escape character '\\a' at position 1" },
-    { input: '"\\u26"', expectedError: "Invalid unicode character '\\u26' at position 1" },
+    { input: '"\\u2', expectedError: "Invalid unicode character '\\u2' at position 1" },
+    { input: '"\\u26', expectedError: "Invalid unicode character '\\u26' at position 1" },
+    { input: '"\\u260', expectedError: "Invalid unicode character '\\u260' at position 1" },
+    {
+      input: '"\\u2605',
+      expectedError: "End of string '\"' expected but reached end of input at position 7"
+    },
+    { input: '{"s \\ud', expectedError: "Invalid unicode character '\\ud' at position 4" },
+    { input: '"\\u26"', expectedError: "Invalid unicode character '\\u26\"' at position 1" },
     { input: '"\\uZ000"', expectedError: "Invalid unicode character '\\uZ000' at position 1" }
   ]
 
diff --git a/src/parse.ts b/src/parse.ts
index e91f35a..29cc174 100644
--- a/src/parse.ts
+++ b/src/parse.ts
@@ -300,11 +300,7 @@ export function parse(
   }
 
   function throwInvalidUnicodeCharacter(start: number) {
-    let end = start + 2
-    while (/\w/.test(text[end])) {
-      end++
-    }
-    const chars = text.slice(start, end)
+    const chars = text.slice(start, start + 6)
     throw new SyntaxError(`Invalid unicode character '${chars}' ${pos()}`)
   }