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module Chronic
# A Span represents a range of time. Since this class extends
# Range, you can use #begin and #end to get the beginning and
# ending times of the span (they will be of class Time)
class Span < Range
# Returns the width of this span in seconds
def width
(self.end - self.begin).to_i
end
# Add a number of seconds to this span, returning the
# resulting Span
def +(seconds)
Span.new(self.begin + seconds, self.end + seconds)
end
# Subtract a number of seconds to this span, returning the
# resulting Span
def -(seconds)
self + -seconds
end
# Prints this span in a nice fashion
def to_s
'(' << self.begin.to_s << '..' << self.end.to_s << ')'
end
alias :cover? :include? if RUBY_VERSION =~ /^1.8/
end
end
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