66 lines
1.0 KiB
Ruby
66 lines
1.0 KiB
Ruby
# frozen_string_literal: true
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# date.rb: Written by Tadayoshi Funaba 1998-2011
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require 'date_core'
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class Date
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def infinite?
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false
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end
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class Infinity < Numeric # :nodoc:
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include Comparable
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def initialize(d=1) @d = d <=> 0 end
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def d() @d end
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protected :d
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def zero?() false end
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def finite?() false end
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def infinite?() d.nonzero? end
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def nan?() d.zero? end
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def abs() self.class.new end
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def -@() self.class.new(-d) end
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def +@() self.class.new(+d) end
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def <=>(other)
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case other
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when Infinity; return d <=> other.d
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when Numeric; return d
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else
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begin
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l, r = other.coerce(self)
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return l <=> r
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rescue NoMethodError
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end
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end
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nil
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end
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def coerce(other)
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case other
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when Numeric; return -d, d
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else
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super
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end
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end
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def to_f
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return 0 if @d == 0
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if @d > 0
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Float::INFINITY
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else
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-Float::INFINITY
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end
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end
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end
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end
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