Module: ISBN

Extended by:
ISBN
Included in:
ISBN
Defined in:
lib/isbn.rb

Defined Under Namespace

Classes: Invalid10DigitISBN, Invalid13DigitISBN, InvalidISBNError, InvalidSourceString, No10DigitISBNAvailable

Instance Method Summary collapse

Instance Method Details

#as_new(isbn) ⇒ Object Also known as: unused 



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# File 'lib/isbn.rb', line 49

def as_new(isbn)
  case isbn.size
  when 13
    case isbn
    when /^978/ then isbn
    when /^290/ then thirteen("978#{isbn[3..-1]}")
    when /^979/ then isbn
    when /^291/ then thirteen("979#{isbn[3..-1]}")
    end
  when 10 then ten(isbn)
  else raise ISBN::InvalidISBNError
  end
end

#as_used(isbn) ⇒ Object Also known as: used 



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# File 'lib/isbn.rb', line 34

def as_used(isbn)
  case isbn.size
  when 13
    case isbn
    when /^978/ then thirteen("290#{isbn[3..-1]}")
    when /^290/ then isbn
    when /^979/ then thirteen("291#{isbn[3..-1]}")
    when /^291/ then isbn
    end
  when 10 then thirteen("290#{isbn}")
  else raise ISBN::InvalidISBNError
  end
end

#from_image(url) ⇒ Object 



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# File 'lib/isbn.rb', line 75

def from_image(url)
  require "open-uri"
  require "tempfile"
  tmp = Tempfile.new("tmp")
  tmp.write(open(url, "rb:binary").read)
  tmp.close
  isbn = %x{djpeg -pnm #{tmp.path} | gocr -}
  isbn.strip.gsub(" ", "").gsub(/o/i, "0").gsub("_", "2").gsub(/2J$/, "45")
end

#from_string(source) ⇒ Object

Raises:



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# File 'lib/isbn.rb', line 85

def from_string(source)
  regex = /(?:ISBN[- ]*13|ISBN[- ]*10|)\s*((?:(?:97[89])?[ -]?(?:[0-9][ -]*){9})[ -]*(?:[0-9xX]))/
  match = source.scan(regex).flatten
  match.map! { |i| i.gsub(/[\s-]+/, "-") }
  match = match.find {|i| ISBN.valid?(i) }
  raise InvalidSourceString unless match
  match
end

#ten(isbn) ⇒ Object Also known as: as_ten

Raises:



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# File 'lib/isbn.rb', line 4

def ten(isbn)
  raise InvalidISBNError unless isbn.is_a? String
  isbn = isbn.delete("-")
  raise No10DigitISBNAvailable if isbn =~ /^979/
  case isbn.size
  when 10 then isbn = isbn[0..8]
  when 13 then isbn = isbn[/(?:^978|^290)*(.{9})\w/,1]
  else raise Invalid10DigitISBN
  end
  case ck = (11 - (isbn.split(//).zip((2..10).to_a.reverse).inject(0) {|s,n| s += n[0].to_i * n[1]} % 11))
  when 10 then isbn << "X"
  when 11 then isbn << "0"
  else isbn << ck.to_s
  end
end

#thirteen(isbn) ⇒ Object Also known as: as_thirteen

Raises:



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# File 'lib/isbn.rb', line 21

def thirteen(isbn)
  raise InvalidISBNError unless isbn.is_a? String
  isbn = isbn.delete("-")
  raise Invalid13DigitISBN unless (isbn.size == 10 || isbn.size == 13)
  isbn = isbn.rjust(13,"978")[/(.+)\w/,1] # adjust to 13 digit isbn and remove check digit
  raise Invalid13DigitISBN unless isbn.size == 12 # after adjustments isbn should be 12 digits
  case ck = (10 - (isbn.split(//).zip([1,3]*6).inject(0) {|s,n| s += n[0].to_i * n[1]} % 10))
  when 10 then isbn << "0"
  else isbn << ck.to_s
  end
end

#valid?(isbn) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/isbn.rb', line 65

def valid?(isbn)
  return false unless isbn.is_a?(String)
  isbn = isbn.delete("-")
  case isbn.size
  when 13 then isbn[-1] == thirteen(isbn)[-1]
  when 10 then isbn[-1].upcase == ten(isbn)[-1]
  else false
  end
end

#with_dashes(isbn) ⇒ Object

Raises:



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# File 'lib/isbn.rb', line 94

def with_dashes(isbn)
  s = isbn.gsub("-", "")
  return s.scan(/(...)(.)(....)(....)(.)/).join('-') if s.size == 13
  return s.scan(/(.)(....)(....)(.)/).join('-') if s.size == 10
  raise InvalidSourceString
end