Module: Factbase::Term::Ordering

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

Overview

Ordering terms.

Author

Yegor Bugayenko ([email protected])

Copyright

Copyright © 2024 Yegor Bugayenko

License

MIT

Instance Method Summary collapse

Instance Method Details

#prev(fact, maps) ⇒ Object 



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# File 'lib/factbase/terms/ordering.rb', line 31

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

#unique(fact, maps) ⇒ Object 



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# File 'lib/factbase/terms/ordering.rb', line 39

def unique(fact, maps)
  @uniques = [] if @uniques.nil?
  assert_args(1)
  vv = the_values(0, fact, maps)
  return false if vv.nil?
  vv = [vv] unless vv.is_a?(Array)
  vv.each do |v|
    return false if @uniques.include?(v)
    @uniques << v
  end
  true
end