Sha256: f2a11f86cabc3370076eb1123d9d09057cb49ac14798ff71d43c532b83282ea3
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Size: 1.76 KB
Versions: 8
Compression:
Stored size: 1.76 KB
Contents
module Petrarca
class InvalidEANPrefixError < StandardError; end
class InvalidRangeError < StandardError; end
module Helpers
extend self
def split(isbn)
isbn = Petrarca.dehyphenate(isbn)
ean_prefix = isbn[0, 3]
unless ean_prefix == "978" || ean_prefix == "979"
raise InvalidEANPrefixError.new("Invalid EAN prefix: #{ean_prefix}")
end
body = isbn[3, 9]
check_digit = isbn[12, 1]
begin
registration_group, body = Helpers.split_to_parts(body, REGISTRATION_GROUP_RANGES[ean_prefix])
rescue InvalidRangeError
raise InvalidRangeError.new("Registration group is not defined: #{body} (under #{ean_prefix})")
end
prefix = "#{ean_prefix}-#{registration_group}"
begin
registrant, publication = Helpers.split_to_parts(body, REGISTRANT_RANGES[prefix])
rescue InvalidRangeError
raise InvalidRangeError.new("Registrant is not defined: #{body} (under #{prefix})")
end
[ean_prefix, registration_group, registrant, publication, check_digit]
end
def split_to_parts(body, ranges)
parts = ranges.map do |range_str|
s, e = range_str.split("-")
prefix = body[0, s.size]
if Range.new(s.to_i, e.to_i).cover?(prefix.to_i)
[prefix, body[(prefix.size)..]]
else
nil
end
end.compact
unless parts.empty?
parts.first
else
raise InvalidRangeError.new(body)
end
end
def load_ranges(range_file)
ranges = {}
File.open(range_file, "r") do |f|
f.each_line do |line|
next if line.start_with?("#")
g, r = line.chomp.split(":")
ranges[g] = r.split(",") unless r.nil?
end
end
ranges
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems