SPDX License Expression Parser and Evaluator

This library parses and evaluates SPDX license expressions. This library provides a robust and efficient way to handle license expressions in your .NET applications, ensuring compliance with SPDX standards.

Features

• SPDX License Expression Parsing: Parse complex SPDX license expressions with ease.
• License Evaluation: Evaluate license expressions against a given context to determine compliance.
• Customizable Context: Implement your own context to evaluate licenses based on your specific requirements.

Getting Started

Prerequisites

• .NET 6.0 SDK or later

Usage

Here's a simple example of how to use the library to parse and evaluate a license expression:

using Progalgo.SPDX;

class AcceptedLicensesContext : HashSet<string>, ILegalContext<bool>
{
    public bool Evaluate(License license, IEnumerable<Exception> exceptions)
    {
        return this.Contains(license.Id);
    }

    public bool EvaluateOption(IEnumerable<bool> vals)
    {
        return vals.Any(x => x);
    }

    public bool EvaluateAnd(IEnumerable<bool> vals)
    {
        return vals.All(x => x);
    }
}

class Program
{
    static void Main()
    {
        LicenseExpression expression = new("MIT OR Apache-2.0");
        var context = new AcceptedLicensesContext { "MIT" };

        bool isCompliant = expression.Evaluate(context);
        Console.WriteLine($"Is compliant: {isCompliant}");
    }
}

Running Tests

To run the tests, use the following command:

dotnet test

Contributing

We welcome contributions!

License

This project is licensed under the GPL License.

Acknowledgements

• FParsec for the powerful F# parser combinator library used in this project.

Contact

For any questions or feedback, please open an issue on GitHub.