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class Range
def intersection(other)
return nil unless intersect?(other)
[self.min, other.min].max..[self.max, other.max].min
end
alias_method :&, :intersection
def intersect?(other)
self.max > other.min and other.max > self.min
end
def remove(other)
return self if (self.max < other.min or other.max < self.min)
[].tap do |remaining|
remaining << (self.min..other.min-1) if self.min < other.min
remaining << (other.max+1..self.max) if other.max < self.max
remaining.compact!
end
end
alias_method :-, :remove
end
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