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Contents
module EDTF
class Epoch
extend Forwardable
include Enumerable
include Comparable
class << self
attr_reader :duration, :format
def current
new(Date.today.year)
end
private :new, :current
end
attr_reader :year
def_delegators :to_range, *Range.instance_methods(false).reject { |m|
m.to_s =~ /^(each|min|max|cover\?|inspect|to_s)$|^\W/
}
def initialize(year = 0)
self.year = year
end
def year=(year)
@year = (year / self.class.duration) * self.class.duration
end
alias get year
alias set year=
def cover?(other)
return false unless other.respond_to?(:day_precision)
other = other.day_precision
min.day_precision! <= other && other <= max.day_precision!
end
def <=>(other)
case other
when Date
cover?(other) ? 0 : to_date <=> other
when Interval, Season
[min, max] <=> [other.min, other.max]
when Epoch
[year, self.class.duration] <=> [other.year, other.class.duration]
else
nil
end
rescue
nil
end
def ===(other)
(self <=> other) == 0
rescue
false
end
def each
if block_given?
to_range.each(&Proc.new)
else
to_enum
end
end
def to_date
Date.new(year).year_precision!
end
alias min to_date
def max
to_date.advance(:years => self.class.duration - 1).end_of_year
end
def to_range
min..max
end
def edtf
self.class.format % (year / self.class.duration)
end
alias to_s edtf
end
class Century < Epoch
@duration = 100.freeze
@format = '%02dxx'.freeze
public_class_method :current, :new
end
class Decade < Epoch
@duration = 10.freeze
@format = '%03dx'.freeze
public_class_method :current, :new
end
end
Version data entries
10 entries across 10 versions & 1 rubygems