1 files changed, 10 insertions, 2 deletions
diff --git a/nuldoc-src/docbook/to_html.ts b/nuldoc-src/docbook/to_html.ts
index c824780..9f176d4 100644
--- a/nuldoc-src/docbook/to_html.ts
+++ b/nuldoc-src/docbook/to_html.ts
@@ -9,6 +9,7 @@ import {
   forEachChild,
   forEachChildRecursively,
   Node,
+  RawHTML,
   removeChildElements,
   Text,
 } from "../dom.ts";
@@ -239,6 +240,7 @@ function transformNoteElement(doc: Document) {
       children: [{
         kind: "text",
         content: "Note",
+        raw: true,
       }],
     };
     const contentElement: Element = {
@@ -298,12 +300,18 @@ function highlightPrograms(doc: Document) {
     if (!language) {
       return;
     }
-    const sourceCode = (codeElement.children[0] as Text).content;
+    const sourceCodeNode = codeElement.children[0] as Text | RawHTML;
+    const sourceCode = sourceCodeNode.content;
+
+    if (!hljs.getLanguage(language)) {
+      return;
+    }
 
     const highlighted =
       hljs.highlight(sourceCode, { language: language }).value;
 
-    (codeElement.children[0] as Text).content = highlighted;
+    sourceCodeNode.content = highlighted;
+    sourceCodeNode.raw = true;
     codeElement.attributes.set("class", "highlight");
   });
 }