Class: Factbase::Zero

Inherits:

TermBase

• Object
• TermBase
• Factbase::Zero

Defined in:

lib/factbase/terms/zero.rb

Overview

The ‘zero` term that evaluates whether any of the operand values is zero when applied to a fact.

Instance Method Summary

• #evaluate(fact, maps, fb) ⇒ Boolean

  Evaluate term on a fact.

• #initialize(operands) ⇒ Zero constructor

  Constructor.

Methods included from TermShared

#to_s

Constructor Details

#initialize(operands) ⇒ Zero

Constructor.

Parameters:

• operands (Array) —

  Operands

# File 'lib/factbase/terms/zero.rb', line 12

def initialize(operands)
  super()
  @operands = operands
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

• fb (Factbase) —

  Factbase to use for sub-queries

Returns:

• (Boolean) —

  True if any value is zero

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

def evaluate(fact, maps, fb)
  assert_args(1)
  vv = _values(0, fact, maps, fb)
  return false if vv.nil?
  vv.any? { |v| (v.is_a?(Integer) || v.is_a?(Float)) && v.zero? }
end