Sha256: 38d01fda4952894c4274ea8668185ab5f91f620ffee6a1c60d3f5e400e0df646
Contents?: true
Size: 1.75 KB
Versions: 16
Compression:
Stored size: 1.75 KB
Contents
module Petrarca
class InvalidEANPrefixError < StandardError; end
class InvalidRangeError < StandardError; end
module Helpers
extend self
def split(isbn)
isbn = isbn.to_s.delete("-")
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
16 entries across 16 versions & 1 rubygems