Module: Factbase::Meta

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

Overview

Meta terms.

Author

Yegor Bugayenko ([email protected])

Copyright

Copyright © 2024-2025 Yegor Bugayenko

License

MIT

Instance Method Summary collapse

Instance Method Details

#absent(fact, _maps, _fb) ⇒ Object 



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# File 'lib/factbase/terms/meta.rb', line 19

def absent(fact, _maps, _fb)
  assert_args(1)
  _by_symbol(0, fact).nil?
end

#exists(fact, _maps, _fb) ⇒ Object 



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

def exists(fact, _maps, _fb)
  assert_args(1)
  !_by_symbol(0, fact).nil?
end

#many(fact, maps, fb) ⇒ Object

The property has many (more than one) values.



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# File 'lib/factbase/terms/meta.rb', line 46

def many(fact, maps, fb)
  assert_args(1)
  v = _values(0, fact, maps, fb)
  !v.nil? && v.size > 1
end

#nil(fact, maps, fb) ⇒ Object 



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# File 'lib/factbase/terms/meta.rb', line 40

def nil(fact, maps, fb)
  assert_args(1)
  _values(0, fact, maps, fb).nil?
end

#one(fact, maps, fb) ⇒ Object

The property has exactly one value.



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# File 'lib/factbase/terms/meta.rb', line 53

def one(fact, maps, fb)
  assert_args(1)
  v = _values(0, fact, maps, fb)
  !v.nil? && v.size == 1
end

#size(fact, _maps, _fb) ⇒ Object 



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# File 'lib/factbase/terms/meta.rb', line 24

def size(fact, _maps, _fb)
  assert_args(1)
  v = _by_symbol(0, fact)
  return 0 if v.nil?
  return 1 unless v.respond_to?(:to_a)
  v.size
end

#type(fact, _maps, _fb) ⇒ Object 



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# File 'lib/factbase/terms/meta.rb', line 32

def type(fact, _maps, _fb)
  assert_args(1)
  v = _by_symbol(0, fact)
  return 'nil' if v.nil?
  v = v[0] if v.respond_to?(:each) && v.size == 1
  v.class.to_s
end