Fix value, value highlighting in editor

src/app/editor/editor.component.ts

@@ -2,6 +2,7 @@ import { CommonModule } from '@angular/common';
 import {
   Component,
   ElementRef,
+  SecurityContext,
   computed,
   effect,
   input,
@@ -11,6 +12,7 @@ import {
 import hljs from 'highlight.js/lib/core';
 import { ProtoMessage } from '../model/proto-message.model';
 import { ProtoFieldComponent } from '../proto-field/proto-field.component';
+import { DomSanitizer } from '@angular/platform-browser';
 
 @Component({
   selector: 'app-editor',
@@ -24,19 +26,44 @@ export class EditorComponent {
   fileContents = input<string>();
   selectedMessage = input.required<ProtoMessage>();
 
-  protected values = computed(() => {
-    const message = this.selectedMessage();
-    return message.values.map((value) => null);
-  });
+  protected values = signal<any>(undefined);
 
   private code = viewChild<ElementRef<HTMLElement>>('code');
 
-  constructor() {
+  constructor(private sanitizer: DomSanitizer) {
     effect(() => {
       const element = this.code()?.nativeElement;
       if (element) {
-        hljs.highlightElement(element);
+        if (!this.values()) {
+          return;
+        }
+        const json = JSON.stringify(this.values(), undefined, 2);
+        const highlighted = hljs.highlightAuto(json, ['json']);
+        const sanitized = sanitizer.sanitize(
+          SecurityContext.HTML,
+          highlighted.value
+        );
+        if (sanitized) {
+          element.innerHTML = sanitized;
+        }
       }
     });
+    effect(
+      () => {
+        const message = this.selectedMessage();
+        this.values.set(
+          Object.fromEntries(
+            message.values.map((value) => [[value.name, null]])
+          )
+        );
+      },
+      { allowSignalWrites: true }
+    );
+  }
+
+  protected updateValue(key: string, value: any) {
+    const existingValue = { ...this.values() };
+    existingValue[key] = value;
+    this.values.set(existingValue);
   }
 }