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Edit File : util.rb \| Size : 3.88 KB
# frozen_string_literal: false # #-- # bigdecimal/util extends various native classes to provide the #to_d method, # and provides BigDecimal#to_d and BigDecimal#to_digits. #++ require 'bigdecimal' class Integer < Numeric # call-seq: # int.to_d -> bigdecimal # # Returns the value of +int+ as a BigDecimal. # # require 'bigdecimal' # require 'bigdecimal/util' # # 42.to_d # => 0.42e2 # # See also BigDecimal::new. # def to_d BigDecimal(self) end end class Float < Numeric # call-seq: # float.to_d -> bigdecimal # float.to_d(precision) -> bigdecimal # # Returns the value of +float+ as a BigDecimal. # The +precision+ parameter is used to determine the number of # significant digits for the result. When +precision+ is set to +0+, # the number of digits to represent the float being converted is determined # automatically. # The default +precision+ is +0+. # # require 'bigdecimal' # require 'bigdecimal/util' # # 0.5.to_d # => 0.5e0 # 1.234.to_d # => 0.1234e1 # 1.234.to_d(2) # => 0.12e1 # # See also BigDecimal::new. # def to_d(precision=0) BigDecimal(self, precision) end end class String # call-seq: # str.to_d -> bigdecimal # # Returns the result of interpreting leading characters in +str+ # as a BigDecimal. # # require 'bigdecimal' # require 'bigdecimal/util' # # "0.5".to_d # => 0.5e0 # "123.45e1".to_d # => 0.12345e4 # "45.67 degrees".to_d # => 0.4567e2 # # See also BigDecimal::new. # def to_d BigDecimal.interpret_loosely(self) end end class BigDecimal < Numeric # call-seq: # a.to_digits -> string # # Converts a BigDecimal to a String of the form "nnnnnn.mmm". # This method is deprecated; use BigDecimal#to_s("F") instead. # # require 'bigdecimal/util' # # d = BigDecimal("3.14") # d.to_digits # => "3.14" # def to_digits if self.nan? \|\| self.infinite? \|\| self.zero? self.to_s else i = self.to_i.to_s _,f,_,z = self.frac.split i + "." + ("0"(-z)) + f end end # call-seq: # a.to_d -> bigdecimal # # Returns self. # # require 'bigdecimal/util' # # d = BigDecimal("3.14") # d.to_d # => 0.314e1 # def to_d self end end class Rational < Numeric # call-seq: # rat.to_d(precision) -> bigdecimal # # Returns the value as a BigDecimal. # # The required +precision+ parameter is used to determine the number of # significant digits for the result. # # require 'bigdecimal' # require 'bigdecimal/util' # # Rational(22, 7).to_d(3) # => 0.314e1 # # See also BigDecimal::new. # def to_d(precision) BigDecimal(self, precision) end end class Complex < Numeric # call-seq: # cmp.to_d -> bigdecimal # cmp.to_d(precision) -> bigdecimal # # Returns the value as a BigDecimal. # # The +precision+ parameter is required for a rational complex number. # This parameter is used to determine the number of significant digits # for the result. # # require 'bigdecimal' # require 'bigdecimal/util' # # Complex(0.1234567, 0).to_d(4) # => 0.1235e0 # Complex(Rational(22, 7), 0).to_d(3) # => 0.314e1 # # See also BigDecimal::new. # def to_d(args) BigDecimal(self) unless self.imag.zero? # to raise eerror if args.length == 0 case self.real when Rational BigDecimal(self.real) # to raise error end end self.real.to_d(*args) end end class NilClass # call-seq: # nil.to_d -> bigdecimal # # Returns nil represented as a BigDecimal. # # require 'bigdecimal' # require 'bigdecimal/util' # # nil.to_d # => 0.0 # def to_d BigDecimal(0) end end Back

Edit File : util.rb | Size : 3.88 KB

# frozen_string_literal: false
#
#--
# bigdecimal/util extends various native classes to provide the #to_d method,
# and provides BigDecimal#to_d and BigDecimal#to_digits.
#++

require 'bigdecimal'

class Integer < Numeric
  # call-seq:
  #     int.to_d  -> bigdecimal
  #
  # Returns the value of +int+ as a BigDecimal.
  #
  #     require 'bigdecimal'
  #     require 'bigdecimal/util'
  #
  #     42.to_d   # => 0.42e2
  #
  # See also BigDecimal::new.
  #
  def to_d
    BigDecimal(self)
  end
end

class Float < Numeric
  # call-seq:
  #     float.to_d             -> bigdecimal
  #     float.to_d(precision)  -> bigdecimal
  #
  # Returns the value of +float+ as a BigDecimal.
  # The +precision+ parameter is used to determine the number of
  # significant digits for the result. When +precision+ is set to +0+,
  # the number of digits to represent the float being converted is determined
  # automatically.
  # The default +precision+ is +0+.
  #
  #     require 'bigdecimal'
  #     require 'bigdecimal/util'
  #
  #     0.5.to_d         # => 0.5e0
  #     1.234.to_d       # => 0.1234e1
  #     1.234.to_d(2)    # => 0.12e1
  #
  # See also BigDecimal::new.
  #
  def to_d(precision=0)
    BigDecimal(self, precision)
  end
end

class String
  # call-seq:
  #     str.to_d  -> bigdecimal
  #
  # Returns the result of interpreting leading characters in +str+
  # as a BigDecimal.
  #
  #     require 'bigdecimal'
  #     require 'bigdecimal/util'
  #
  #     "0.5".to_d             # => 0.5e0
  #     "123.45e1".to_d        # => 0.12345e4
  #     "45.67 degrees".to_d   # => 0.4567e2
  #
  # See also BigDecimal::new.
  #
  def to_d
    BigDecimal.interpret_loosely(self)
  end
end

class BigDecimal < Numeric
  # call-seq:
  #     a.to_digits -> string
  #
  # Converts a BigDecimal to a String of the form "nnnnnn.mmm".
  # This method is deprecated; use BigDecimal#to_s("F") instead.
  #
  #     require 'bigdecimal/util'
  #
  #     d = BigDecimal("3.14")
  #     d.to_digits                  # => "3.14"
  #
  def to_digits
    if self.nan? || self.infinite? || self.zero?
      self.to_s
    else
      i       = self.to_i.to_s
      _,f,_,z = self.frac.split
      i + "." + ("0"*(-z)) + f
    end
  end

# call-seq:
  #     a.to_d -> bigdecimal
  #
  # Returns self.
  #
  #     require 'bigdecimal/util'
  #
  #     d = BigDecimal("3.14")
  #     d.to_d                       # => 0.314e1
  #
  def to_d
    self
  end
end

class Rational < Numeric
  # call-seq:
  #     rat.to_d(precision)  -> bigdecimal
  #
  # Returns the value as a BigDecimal.
  #
  # The required +precision+ parameter is used to determine the number of
  # significant digits for the result.
  #
  #     require 'bigdecimal'
  #     require 'bigdecimal/util'
  #
  #     Rational(22, 7).to_d(3)   # => 0.314e1
  #
  # See also BigDecimal::new.
  #
  def to_d(precision)
    BigDecimal(self, precision)
  end
end

class Complex < Numeric
  # call-seq:
  #     cmp.to_d             -> bigdecimal
  #     cmp.to_d(precision)  -> bigdecimal
  #
  # Returns the value as a BigDecimal.
  #
  # The +precision+ parameter is required for a rational complex number.
  # This parameter is used to determine the number of significant digits
  # for the result.
  #
  #     require 'bigdecimal'
  #     require 'bigdecimal/util'
  #
  #     Complex(0.1234567, 0).to_d(4)   # => 0.1235e0
  #     Complex(Rational(22, 7), 0).to_d(3)   # => 0.314e1
  #
  # See also BigDecimal::new.
  #
  def to_d(*args)
    BigDecimal(self) unless self.imag.zero? # to raise eerror

if args.length == 0
      case self.real
      when Rational
        BigDecimal(self.real) # to raise error
      end
    end
    self.real.to_d(*args)
  end
end

class NilClass
  # call-seq:
  #     nil.to_d -> bigdecimal
  #
  # Returns nil represented as a BigDecimal.
  #
  #     require 'bigdecimal'
  #     require 'bigdecimal/util'
  #
  #     nil.to_d   # => 0.0
  #
  def to_d
    BigDecimal(0)
  end
end

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