Module: SecurerRandomer

Defined in:
lib/securer_randomer/rand.rb,
lib/securer_randomer/version.rb

Constant Summary collapse

VERSION =

rubocop:disable Style/MutableConstant

'0.1.8'

Class Method Summary collapse

Class Method Details

.kernel_rand(max = 0) ⇒ Object 



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# File 'lib/securer_randomer/rand.rb', line 4

def self.kernel_rand(max = 0)
  rand(max, true)
end

.rand(n = 0, emulate_kernel = false) ⇒ Object 



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# File 'lib/securer_randomer/rand.rb', line 8

def self.rand(n = 0, emulate_kernel = false)
  if n.is_a?(Range)
    unless n.begin.is_a?(Numeric) and n.end.is_a?(Numeric)
      if emulate_kernel and defined?(JRUBY_VERSION)
        raise NoMethodError, "undefined method `-' for \"#{n.end}\""
      else
        raise TypeError, 'no implicit conversion of Range into Fixnum'
      end
    end

    if n.end < n.begin
      if emulate_kernel
        raise ArgumentError, "invalid argument - #{n}" if defined?(JRUBY_VERSION)

        nil
      else
        m = Range.new(n.end, n.begin, false)

        while true # TODO: better way to do this than looping?
          q = _rand_range(m)

          break q unless n.exclude_end? and q == n.end
        end
      end
    elsif n.begin == n.end and n.exclude_end?
      raise ArgumentError, "invalid argument - #{n}" if emulate_kernel and defined?(JRUBY_VERSION)

      nil
    else
      _rand_range(n)
    end
  else
    raise TypeError, "no implicit conversion of #{n.class} into Fixnum" \
      unless n.nil? or n.is_a?(Numeric)

    if n.nil? or n.zero?
      _randex
    elsif emulate_kernel
      _rand_range(Range.new(0, n.to_i.abs, true))
    else
      _rand_range(Range.new(0, n.abs, true)) * (n < 0 ? -1 : 1)
    end
  end
end