Module: Factbase::Ordering

Included in:
Term
Defined in:
lib/factbase/terms/ordering.rb

Overview

Ordering terms.

Author

Yegor Bugayenko ([email protected])

Copyright

Copyright © 2024-2025 Yegor Bugayenko

License

MIT

Instance Method Summary collapse

Instance Method Details

#prev(fact, maps, fb) ⇒ Object 



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# File 'lib/factbase/terms/ordering.rb', line 14

def prev(fact, maps, fb)
  assert_args(1)
  before = @prev
  v = _values(0, fact, maps, fb)
  @prev = v
  before
end

#unique(fact, maps, fb) ⇒ Object 



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# File 'lib/factbase/terms/ordering.rb', line 22

def unique(fact, maps, fb)
  @uniques = {} if @uniques.nil?
  raise "Too few operands for 'unique' (at least 1 expected)" if @operands.empty?
  results = []
  @operands.each_with_index do |_, i|
    @uniques[i] = [] if @uniques[i].nil?
    vv = _values(i, fact, maps, fb)
    return false if vv.nil?
    vv = [vv] unless vv.respond_to?(:to_a)
    vv.each do |v|
      if @uniques[i].include?(v)
        results << false
      else
        @uniques[i] << v
        results << true
      end
    end
  end
  return false if results.all?(false)
  true
end