Ruby feelin

This gem uses embed V8 JavaScript engine and feelin JavaScript library to parse and evaluate DMN FEEL expressions. Performance of this approach for executing JS in Ruby is comparable with V8 native performance.

Install

gem 'feelin'

Usage

Evaluate

# without context
FEELIN.evaluate('for a in [1, 2, 3] return a * 2') # [ 2, 4, 6 ]

# with context
FEELIN.evaluate("Mike's daughter.name", { 'Mike\'s daughter.name' => 'Lisa' }) # Lisa

Unary tests

# without context
FEELIN.unary_test('1', 1) # true

# with context
FEELIN.unary_test('[1..end]', 1, { 'end' => 10 }) # true

Custom functions

FEELIN.add_function('rates', proc { [10, 20] })
FEELIN.evaluate('every rate in rates() satisfies rate < 10') # false

Versioning policy

Because this library is a wrapper - it is released with the same major/minor version numbers as the underlying feelin library