FEEL Scala

A parser and interpreter for FEEL that is written in Scala (see What is FEEL?).

The FEEL engine started as a slack time project, grown to a community-driven project and is now officially maintained by Camunda :rocket:

It is integrated in the following projects:

• Camunda Platform as part of the DMN engine
• Zeebe as expression language

Features: :sparkles:

• full support for unary-tests and expressions (DMN 1.2)
• including built-in functions
• extensible by own functions and custom object mappers

Usage

Please have a look at the documentation. It describes how to write FEEL expressions (e.g. data types, language constructs, builtin-functions, etc.), and contains some examples.

Install

Please have a look at the documentation. It describes how to intregrate the engine into your application, and how to extend/customize it.

Contribution

Contributions are welcome 🎉 Please have a look at the Contribution Guide.

The following resources can help to understand some general concepts behind the implementation:

• Build your own Programming Language with Scala
• Easy Parsing with Parser Combinators
• FastParse - Documentation of the Parser Library

License

Apache License, Version 2.0