Xojo Syntax Highlight for Web

Syntax highlighting for the Xojo programming language — four independent, single-file, zero-dependency drop-ins for the most popular web highlighting libraries.

Library	File	Language
highlight.js	highlightjs/xojo.highlight.js	JavaScript (ES module)
Prism.js	prismjs/xojo.prism.js	JavaScript (IIFE)
CodeMirror 6	codemirror/xojo.codemirror.js	JavaScript (ES module)
Pygments	pygments/xojo.pygments.py	Python

Each implementation handles Xojo-specific syntax that VB-based grammars miss: // and ' comments, Var, Nil, Self/Super/Me, #tag/#pragma preprocessor directives, and &h/&b numeric literals — all case-insensitive.

---

Quick Start

Run a demo server

python3 -m http.server 8000

Then open:

• Landing page: http://localhost:8000/
• highlight.js demo: http://localhost:8000/highlightjs/demo/
• Prism.js demo: http://localhost:8000/prismjs/demo/
• CodeMirror 6 demo: http://localhost:8000/codemirror/demo/

---

1. highlight.js

Copy highlightjs/xojo.highlight.js into your project.

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/atom-one-dark.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
<script type="module">
  import xojo from './xojo.highlight.js';
  hljs.registerLanguage('xojo', xojo);
  hljs.highlightAll();
</script>

<pre><code class="language-xojo">
Var greeting As String = "Hello, World!"
</code></pre>

See highlightjs/README.md and highlightjs/userguide.md for full details.

---

2. Prism.js

Copy prismjs/xojo.prism.js into your project. Load it after prism.js.

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/prism.min.js"></script>
<script src="./xojo.prism.js"></script>

<pre><code class="language-xojo">
Var greeting As String = "Hello, World!"
</code></pre>

Prism auto-highlights on DOMContentLoaded — no extra JavaScript needed.

See prismjs/README.md and prismjs/userguide.md for full details.

---

3. CodeMirror 6

Copy codemirror/xojo.codemirror.js into your project.

<script type="importmap">
{
  "imports": {
    "codemirror":           "https://esm.sh/*codemirror@6",
    "@codemirror/language": "https://esm.sh/*@codemirror/language@6"
  }
}
</script>

<script type="module">
  import { EditorView, basicSetup } from "codemirror";
  import { StreamLanguage }         from "@codemirror/language";
  import { xojoStreamParser }       from "./xojo.codemirror.js";

  new EditorView({
    doc: 'Var greeting As String = "Hello, World!"',
    extensions: [ basicSetup, StreamLanguage.define(xojoStreamParser) ],
    parent: document.getElementById("editor"),
  });
</script>

<div id="editor"></div>

See codemirror/README.md and codemirror/userguide.md for full details.

---

4. Pygments

No install required — copy pygments/xojo.pygments.py into your project.

# Highlight a file to HTML from the command line
python3 -m pygments -x -l pygments/xojo.pygments.py:XojoLexer yourfile.xojo_code \
  -f html -O full,style=monokai -o output.html

# Generate the demo page
python3 pygments/demo/demo.py
# Output: pygments/demo/output.html

See pygments/README.md for Python API usage and full details.

---

Directory Structure

xojo-syntax-highlight/
├── highlightjs/
│   ├── xojo.highlight.js      # highlight.js grammar (ES module)
│   ├── demo/index.html        # interactive demo
│   ├── README.md
│   └── userguide.md
├── prismjs/
│   ├── xojo.prism.js          # Prism.js grammar (IIFE, self-registers)
│   ├── demo/index.html
│   ├── README.md
│   └── userguide.md
├── codemirror/
│   ├── xojo.codemirror.js     # CodeMirror 6 StreamParser
│   ├── test.mjs               # Node.js test suite
│   ├── demo/index.html
│   ├── README.md
│   └── userguide.md
├── pygments/
│   ├── xojo.pygments.py       # Pygments RegexLexer
│   ├── test.py                # Python test suite
│   ├── demo/demo.py           # HTML demo generator
│   └── README.md
├── index.html                 # landing page
└── README.md

---

Running Tests

# CodeMirror (Node.js)
cd codemirror && node test.mjs

# Pygments (Python)
python3 pygments/test.py

---

Clone & develop

git clone https://github.com/Jedt3D/xojo-syntax-highlight-for-web.git
cd xojo-syntax-highlight-for-web
python3 -m http.server 8000

No build step — all four grammars are single-file libraries.

---

License

MIT