From 81f4013dcf6ef5345a7d51c12a4e824d5ad822cd Mon Sep 17 00:00:00 2001
From: Sam Pagenkopf <ssaammp@gmail.com>
Date: Sun, 4 Feb 2024 18:18:07 -0600
Subject: [PATCH] add lexer error

---
 structedit/liveparse.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/structedit/liveparse.js b/structedit/liveparse.js
index 929cf09..c1ab337 100644
--- a/structedit/liveparse.js
+++ b/structedit/liveparse.js
@@ -13,8 +13,8 @@ function load() {
 }
 
 function generateTree(text) {
-  const lexed = lexString(text);
   try {
+    const lexed = lexString(text);
     const parsed = parseTokens(lexed);
     const tree = trimTree(parsed);
     console.log(JSON.stringify(tree));
@@ -63,6 +63,9 @@ function lexString(text, position = 0) {
       matchKind = candidate[0];
     }
     if (!candidate || end > text.length) {
+      if (matchKind === "UNKNOWN") {
+        throw new Error(`Unknown Token: ${token}`);
+      }
       if (end <= text.length) token = token.slice(0, -1);
       if (matchKind !== 'white') {
         const parsedToken = {