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A DMN FEEL parser and interpreter written in JavaScript

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feelin

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A DMN FEEL parser and interpreter written in JavaScript. ➡️ Try it out.

Usage

import {
  unaryTest,
  evaluate
} from 'feelin';

unaryTest('1', { '?': 1 }); // true
unaryTest('[1..end]', { '?': 1, end: 10 }); // true

evaluate("Mike's dauther.name", {
  'Mike\'s dauther.name': 'Lisa'
}); // "Lisa"

evaluate('for a in [1, 2, 3] return a * 2'); // [ 2, 4, 6 ]

evaluate('every rate in rates() satisfies rate < 10', {
  rates() {
    return [ 10, 20 ];
  }
}); // false

Features

  • Recognizes full FEEL grammar
  • Context sensitive (incl. names with spaces)
  • Recovers on errors
  • Temporal types and operations
  • Built-in FEEL functions
  • Full DMN TCK compliance

Build and Run

# build the library and run all tests
npm run all

# spin up for local development
npm run dev

# execute FEEL tests in DMN TCK
npm run tck

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License

MIT

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A DMN FEEL parser and interpreter written in JavaScript

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  • JavaScript 51.7%
  • TypeScript 48.3%