Class: Istox::FMath

Inherits:
Object
  • Object
show all
Defined in:
lib/istox/helpers/f_math.rb

Class Method Summary collapse

Class Method Details

.add(x, y) ⇒ Object 



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# File 'lib/istox/helpers/f_math.rb', line 5

def add(x, y)
  BigDecimal.mode(BigDecimal::ROUND_MODE, :down)

  x = 0 if x.blank?
  y = 0 if y.blank?

  x = ::BigDecimal.new(x.to_s)
  y = ::BigDecimal.new(y.to_s)

  return x.add(y, 100).truncate(18).to_s
end

.div(x, y) ⇒ Object 



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# File 'lib/istox/helpers/f_math.rb', line 41

def div(x, y)
  BigDecimal.mode(BigDecimal::ROUND_MODE, :down)

  x = 0 if x.blank?
  y = 0 if y.blank?

  x = to_fixed(x)
  y = to_fixed(y)

  return ::BigDecimal.new("1").to_s if x == y

  fixed_1 = ::BigDecimal.new("1e18")
  
  if (((x.div(y, 100)).modulo(BigDecimal.new(10)) == 0) && (x.modulo(y) == 0)) 
    return from_fixed((x.div(y, 100).mult(fixed_1, 100)))
  end

  r_y = fixed_1.mult(fixed_1, 100).truncate(0).div(y, 100).truncate(0)

  result = from_fixed(x.mult(r_y, 100).truncate(0).div(fixed_1, 100).truncate(0))

  return result.truncate(18).to_s
end

.mul(x, y) ⇒ Object 



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# File 'lib/istox/helpers/f_math.rb', line 29

def mul(x, y)
  BigDecimal.mode(BigDecimal::ROUND_MODE, :down)

  x = 0 if x.blank?
  y = 0 if y.blank?

  x = ::BigDecimal.new(x.to_s)
  y = ::BigDecimal.new(y.to_s)

  return x.mult(y, 100).truncate(18).to_s
end

.round_down(x, digits) ⇒ Object 



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# File 'lib/istox/helpers/f_math.rb', line 71

def round_down(x, digits)
  BigDecimal.mode(BigDecimal::ROUND_MODE, :down)
  x = 0 if x.blank?
  ::BigDecimal.new(x.to_s).round(digits).to_s
end

.round_up(x, digits) ⇒ Object 



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# File 'lib/istox/helpers/f_math.rb', line 65

def round_up(x, digits)
  BigDecimal.mode(BigDecimal::ROUND_MODE, :up)
  x = 0 if x.blank?
  ::BigDecimal.new(x.to_s).round(digits).to_s
end

.sub(x, y) ⇒ Object 



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# File 'lib/istox/helpers/f_math.rb', line 17

def sub(x, y)
  BigDecimal.mode(BigDecimal::ROUND_MODE, :down)

  x = 0 if x.blank?
  y = 0 if y.blank?

  x = ::BigDecimal.new(x.to_s)
  y = ::BigDecimal.new(y.to_s)

  return x.sub(y, 100).truncate(18).to_s
end