This gem is used in packø, needed to check tag filters in non-relational databases.
Simple example:
require 'boolean/expression'
Boolean::Expression['something || something-else'][:something] # => true
Boolean::Expression['something && something-else'][:something] # => false
Boolean::Expression['something && !something-else'][:something] # => trueYou can also use more complex expression with parenthesis and NOT operators.