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Contents
#
# A numeric interval
#
# --
# could be done with a Range but proved annoying in practice
# what with Range's immutability, etc.
# ++
#
class UnionInterval
attr_accessor :min, :max
# initialize with set min or max values.
# To create an interval with no lower bound call:
# UnionInterval.new(nil, 69)
# Pass nil (or omit) +max+ for no upper bound:
# UnionInterval.new(5, nil)
def initialize min=nil, max=nil
self.min = min
self.max = max
end
# Expand the interval to include all the vals
def << vals
self.min = [min, vals.to_a].flatten.compact.min
self.max = [max, vals.to_a].flatten.compact.max
end
def + min_max
sum_min = [min, min_max.to_a].flatten.compact.min
sum_max = [max, min_max.to_a].flatten.compact.max
UnionInterval.new sum_min, sum_max
end
# returns span as an array:
# [min, max]
def to_a
[min, max]
end
# true if the extent is defined but empty (lower bound exceeds upper bound)
def empty?
min && max && (min > max)
end
def include? val
val && (!min || (val >= min)) && (!max || (val <= max))
end
def size
return 0 unless max && min
max - min
end
# string conversion:
# #<span:7..956734>
def to_s
"#<span:#{min}..#{max}>"
end
def inspect() to_s end
end
Version data entries
5 entries across 5 versions & 1 rubygems