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# Contains some utility methods that are used by the other classes
module Egn
module Util
WEIGHTS = [2,4,8,5,10,9,7,3,6]
# The EGN can have three different formats depending on the century. It can
# be determined by examining the month.
# The rules are as follows:
# * For people born in 1900..1999 the month does not change
# * For people born in 1800..1899 the month is +20 (e.g January is 21)
# * For people born in 2000..2099 the month is +40 (e.g December is 52)
def self.determine_date(year, month)
case month
when (1..12)
year = "19#{year}"
when (21..32)
month -= 20
year = "18#{year}"
when (41..52)
month -= 40
year = "20#{year}"
end
[year.to_i, month]
end
# The checksum is calculated from the first 9 digits.
def self.egn_checksum(egn)
sum = egn.split('').map(&:to_i).zip(WEIGHTS).map { |n| n.reduce(:*) }.reduce(:+)
rest = sum % 11
rest < 10 ? rest : 0
end
# Get a random date
def self.time_rand(from = 0.0, to = Time.now)
Time.at(from + rand * (to.to_f - from.to_f))
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems