Class: Qti::V1::Models::Numerics::Precision

Inherits:
ScoringBase
  • Object
show all
Includes:
ActionView::Helpers::NumberHelper
Defined in:
lib/qti/v1/models/numerics/precision.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from ScoringBase

#equal_node, #gt_node, #gte_node, #lte_node

Constructor Details

#initialize(scoring_node) ⇒ Precision

Returns a new instance of Precision.



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# File 'lib/qti/v1/models/numerics/precision.rb', line 10

def initialize(scoring_node)
  super(scoring_node)
end

Class Method Details

.significant_digits(number_s) ⇒ Object 



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# File 'lib/qti/v1/models/numerics/precision.rb', line 44

def self.significant_digits(number_s)
  sig = 0
  zeros = 0
  number_s.each_char do |c|
    next if (sig.zero? && c == '0') || c == '.'
    if c == '0'
      zeros += 1
    else
      sig += zeros + 1
      zeros = 0
    end
  end
  # this is not exactly significant digits
  # trailing zeros are ignored
  # because gt_node and lte_ndoe don't expect trailing zeros
  sig
end

Instance Method Details

#precision ⇒ Object 



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# File 'lib/qti/v1/models/numerics/precision.rb', line 36

def precision
  sig = [
    Precision.significant_digits(gt_node.content),
    Precision.significant_digits(lte_node.content)
  ].max
  sig - 1
end

#scoring_data ⇒ Object 



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# File 'lib/qti/v1/models/numerics/precision.rb', line 14

def scoring_data
  return unless equal_node && gt_node && lte_node
  Struct.new(
    :id,
    :type,
    :value,
    :precision,
    :precision_type
  ).new(
    equal_node.attributes['respident']&.value,
    'preciseResponse',
    value,
    precision.to_s,
    'significantDigits'
  )
end

#value ⇒ Object 



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# File 'lib/qti/v1/models/numerics/precision.rb', line 31

def value
  fval = equal_node.content.to_f
  number_with_precision(fval, precision: precision, significant: true)
end