Module: LogStash::Filters::MathCalculationElements

Defined in:
lib/logstash/filters/math_calculation_elements.rb

Defined Under Namespace

Classes: FieldElement, LiteralElement, RegisterElement

Constant Summary collapse

REGISTER_REFERENCE_RE = 
/^MEM\[(\d+)]$/

Class Method Summary collapse

Class Method Details

.build(reference, position, register) ⇒ Object 



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# File 'lib/logstash/filters/math_calculation_elements.rb', line 8

def self.build(reference, position, register)
  case reference
  when Numeric
    if position == 3
      # literal reference for result element
      nil
    else
      LiteralElement.new(reference, position)
    end
  when String
    match = REGISTER_REFERENCE_RE.match(reference)
    if match
      RegisterElement.new(reference, position, match[1].to_i, register)
    else
      FieldElement.new(reference, position)
    end
  else
    nil
  end
end