Class: Factbase::ToString

Inherits:

TermBase

• Object
• TermBase
• Factbase::ToString

Defined in:

lib/factbase/terms/to_string.rb

Overview

This class is used to evaluate a term and return its string representation.

Instance Method Summary

• #evaluate(fact, maps, fb) ⇒ String

  Evaluate term on a fact.

• #initialize(operands) ⇒ ToString constructor

  Constructor.

Methods included from TermShared

#to_s

Constructor Details

#initialize(operands) ⇒ ToString

Constructor.

Parameters:

• operands (Array) —

  Operands

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

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

Instance Method Details

#evaluate(fact, maps, fb) ⇒ String

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:

• (String) —

  The same value as string

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

def evaluate(fact, maps, fb)
  assert_args(1)
  vv = _values(0, fact, maps, fb)
  return nil if vv.nil?
  vv[0].to_s
end