GRL Syntax Highlighting for VS Code

A professional Visual Studio Code extension for Grule Rule Language (GRL) syntax highlighting, auto-completion, and rule authoring.
Designed for Rust Rule Engine, Drools-compatible workflows, and advanced business rule systems.

✨ Features

Syntax Highlighting: Full GRL keyword, attribute, function, action, and pattern highlighting.
Auto-complete Snippets: Quickly insert rule templates, attributes (no-loop, agenda-group, activation-group, etc.), actions, and patterns.
Function Detection: Automatically highlights function names (e.g. log, update, sendEmail) before (.
Advanced Attribute Support: Supports all Drools-style attributes: no-loop, agenda-group, activation-group, lock-on-active, date-effective, date-expires, salience.
Works with .grl files: Just open or create a .grl file and start writing!

📸 Screenshots

Syntax Highlighting Example

🚀 Quick Start

Install:

Download from VS Code Marketplace (after publish).

Or run:

code --install-extension grl-syntax-highlighting-<version>.vsix

Open a .grl file:
- Start typing GRL rules, attributes, actions, and functions.
- Use auto-complete for fast rule authoring.

📝 Example

rule "VIPCustomerWelcome" salience 20 no-loop agenda-group "welcome" {
    when
        Customer.tier == "VIP" && Customer.welcome_sent != true
    then
        SendEmail(Customer.email, "VIP Welcome Package", "Welcome to our VIP program!");
        LogToDatabase("customer_events", "vip_welcome_sent");
        Customer.welcome_sent = true;
}

⚡ Supported GRL Features

Keywords: rule, when, then, salience, exists, forall, not, true, false
Attributes: agenda-group, activation-group, lock-on-active, no-loop, date-effective, date-expires
Actions/Functions: Auto-highlight and snippet support for all common GRL actions and functions
Pattern Matching: exists(...), forall(...), !exists(...)
String & Number Highlighting

🔧 Requirements

Visual Studio Code v1.60 or higher
No additional dependencies

⚙️ Extension Settings

This extension does not add custom settings.
Just install and use!

🐞 Known Issues

If you find any issues, please report them on GitHub Issues.

📦 Release Notes

1.0.0

Initial release: syntax highlighting, auto-complete snippets, advanced attribute support.

🤝 Contributing

Pull requests and feedback are welcome!
See CONTRIBUTING.md for details.

📚 More Information

**Enjoy professional GRL authoring in VS

Grule Rule Language (GRL) Syntax & Snippets

Ton That Vu