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Versions: 14
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Contents
module Spruz
# A bit more versatile rounding for Ruby
module Round
def self.included(klass)
if klass.instance_method(:round)
klass.class_eval do
begin
alias_method :__old_round__, :round
remove_method :round
rescue NameError
end
end
super
else
raise NoMethodError, 'no round method found'
end
end
def round(places = nil)
if places == nil || places == 0
return __old_round__
elsif places.respond_to?(:to_int)
places = places.to_int
else
raise TypeError, "argument places has to be like an Integer"
end
if places < 0
max_places = -Math.log(self.abs + 1) / Math.log(10)
raise ArgumentError, "places has to be >= #{max_places.ceil}" if max_places > places
end
t = self
f = 10.0 ** places
t *= f
if t.infinite?
result = self
else
if t >= 0.0
t = (t + 0.5).floor
elsif t < 0.0
t = (t - 0.5).ceil
end
t /= f
result = t.nan? ? self : t
end
max_places and result = result.to_i # if places < 0
result
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems