Class: Factbase::Not

Inherits:

TermBase

• Object
• TermBase
• Factbase::Not

Defined in:

lib/factbase/terms/not.rb

Overview

The 'not' term that negates a boolean operand. Logical negation (NOT) of an operand.

Instance Method Summary

• #evaluate(fact, maps, fb) ⇒ Boolean

  Evaluate term on a fact.

• #initialize(operands) ⇒ Not constructor

  Constructor.

Constructor Details

#initialize(operands) ⇒ Not

Constructor.

Parameters:

• operands (Array) —

  Operands

# File 'lib/factbase/terms/not.rb', line 13

def initialize(operands)
  super()
  @operands = operands
  @op = :not
end

Instance Method Details

#evaluate(fact, maps, fb) ⇒ Boolean

Evaluate term on a fact.

Parameters:

• fact (Factbase::Fact) —

  The fact

• maps (Array<Factbase::Fact>) —

  All maps available

Returns:

• (Boolean) —

  Negated boolean result of the operand

# File 'lib/factbase/terms/not.rb', line 23

def evaluate(fact, maps, fb)
  assert_args(1)
  !Factbase::Boolean.new(_values(0, fact, maps, fb), @operands[0]).bool?
end