handle input file parsing errors - fixes #1

Author: mesarth

src/Controller.ts

@@ -66,7 +66,18 @@ export class Controller {
     }
 
     const document = await vscode.workspace.openTextDocument(selectedFileUri);
-    inputContent = JSON.parse(document.getText());
+    try {
+      inputContent = JSON.parse(document.getText());
+    }
+    catch (error: any) {
+      execution.replaceOutput([
+        new vscode.NotebookCellOutput([
+          vscode.NotebookCellOutputItem.text(`Error parsing JSON file. Please check the file and try again. \n\n${error.message}`),
+        ])
+      ]);
+      execution.end(false, Date.now());
+      return;
+    }
 
     if (isMainThread) {
       const worker = new Worker(join(__filename, '../worker.js'), {

src/Serializer.ts

@@ -50,7 +50,8 @@ export class Serializer implements vscode.NotebookSerializer {
     let contents: RawNotebookCell[] = [];
 
     for (const cell of data.cells) {
-      const rawOutput = cell?.outputs?.at(0)?.items[0].data;
+      const outputItem = cell?.outputs?.at(0)?.items[0];
+      const rawOutput = outputItem?.mime === 'text/x-json' ? outputItem.data : undefined;
       let output = undefined;
       if (rawOutput) {
         output = JSON.parse(new TextDecoder().decode(rawOutput));