Class: Numeric

Inherits:
Object show all
Defined in:
lib/json/canonicalization.rb

Instance Method Summary collapse

Instance Method Details

#to_json_c14n ⇒ Object

Raises:

  • (RangeError) 


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# File 'lib/json/canonicalization.rb', line 29

def to_json_c14n
  raise RangeError if self.is_a?(Float) && (self.nan? || self.infinite?)
  return "0" if self.zero?
  num = self
  if num < 0
    num, sign = -num, '-'
  end
  native_rep = "%.15E" % num
  decimal, exponential = native_rep.split('E')
  exp_val = exponential.to_i
  exponential = exp_val > 0 ? ('+' + exp_val.to_s) : exp_val.to_s

  integral, fractional = decimal.split('.')
  fractional = fractional.sub(/0+$/, '')  # Remove trailing zeros

  if exp_val > 0 && exp_val < 21
    while exp_val > 0
      integral += fractional.to_s[0] || '0'
      fractional = fractional.to_s[1..-1]
      exp_val -= 1
    end
    exponential = nil
  elsif exp_val == 0
    exponential = nil
  elsif exp_val < 0 && exp_val > -7
    # Small numbers are shown as 0.etc with e-6 as lower limit
    fractional, integral, exponential = integral + fractional.to_s, '0', nil
    fractional = ("0" * (-exp_val - 1)) + fractional
  end

  fractional = nil if fractional.to_s.empty?
  sign.to_s + integral + (fractional ? ".#{fractional}" : '') + (exponential ? "e#{exponential}" : '')
end