Provided by: libbusiness-isbn-perl_3.009-1_all 
NAME
Business::ISBN - work with International Standard Book Numbers
SYNOPSIS
use Business::ISBN;
# 10 digit ISBNs
$isbn10 = Business::ISBN->new('1565922573');
$isbn10 = Business::ISBN->new('1-56592-257-3');
# 13 digit ISBNs
$isbn13 = Business::ISBN->new('978-0-596-52724-2');
# convert
$isbn10 = $isbn13->as_isbn10; # for the 978 prefixes
$isbn13 = $isbn10->as_isbn13;
# maybe you don't care what it is as long as everything works
$isbn = Business::ISBN->new( $ARGV[0] );
#print the ISBN with hyphens at usual positions
print $isbn->as_string;
#print the ISBN with hyphens at specified positions.
#this not does affect the default positions
print $isbn->as_string([]);
#print the group code or publisher code
print $isbn->group_code;
print $isbn->publisher_code;
#check to see if the ISBN is valid
$isbn->is_valid;
#fix the ISBN checksum. BEWARE: the error might not be
#in the checksum!
$isbn->fix_checksum;
# create an EAN13 barcode in PNG format
$isbn->png_barcode;
DESCRIPTION
This modules handles International Standard Book Numbers, including ISBN-10 and ISBN-13.
The data come from Business::ISBN::Data, which means you can update the data separately
from the code. Also, you can use Business::ISBN::Data with whatever RangeMessage.xml you
like if you have updated data. See that module for details.
Function interface
valid_isbn_checksum( ISBN10 | ISBN13 )
This function is exportable on demand, and works for either 10 or 13 character ISBNs).
use Business::ISBN qw( valid_isbn_checksum );
Returns 1 if the ISBN is a valid ISBN with the right checksum.
Returns 0 if the ISBN has valid prefix and publisher codes, but an invalid checksum.
Returns undef if the ISBN does not validate for any other reason.
Object interface
new($isbn)
The constructor accepts a scalar representing the ISBN.
The string representing the ISBN may contain characters other than "[0-9xX]", although
these will be removed in the internal representation. The resulting string must look
like an ISBN - the first nine characters must be digits and the tenth character must
be a digit, 'x', or 'X'.
The constructor attempts to determine the group code and the publisher code. If these
data cannot be determined, the constructor sets "$obj->error" to something other than
"GOOD_ISBN". An object is still returned and it is up to the program to check the
"error" method for one of five values or one of the "error_*" methods to check for a
particular error. The actual values of these symbolic versions are the same as those
from previous versions of this module which used literal values:
Business::ISBN::INVALID_PUBLISHER_CODE
Business::ISBN::INVALID_GROUP_CODE
Business::ISBN::BAD_CHECKSUM
Business::ISBN::GOOD_ISBN
Business::ISBN::BAD_ISBN
If you have one of these values and want to turn it into a string, you can use the
%Business::ISBN::ERROR_TEXT hash, which is exportable by asking for it explicitly in
the import list:
use Business::ISBN qw(%ERROR_TEXT);
As of version 2.010_01, you can get this text from "error_text" so you don't have to
import anything.
The string passed as the ISBN need not be a valid ISBN as long as it superficially
looks like one. This allows one to use the fix_checksum() method. Despite the
disclaimer in the discussion of that method, the author has found it extremely useful.
One should check the validity of the ISBN with is_valid() rather than relying on the
return value of the constructor. If all one wants to do is check the validity of an
ISBN, one can skip the object-oriented interface and use the valid_isbn_checksum()
function which is exportable on demand.
If the constructor decides it cannot create an object, it returns "undef". It may do
this if the string passed as the ISBN cannot be munged to the internal format meaning
that it does not even come close to looking like an ISBN.
Instance methods
input_isbn
Returns the starting ISBN. Since you may insert hyphens or fix checksums, you might
want to see the original data.
common_data
Returns the starting ISBN after normalization, which removes anything that isn't a
digit or a valid checksum character.
isbn
Returns the current value of ISBN, even if it has an invalid checksum. This is the
raw data so it doesn't have the hyphens. If you want hyphenation, try "as_string".
The "isbn" method should be the same as as_string( [] ).
error
Return the error code for the reason the ISBN isn't valid. The return value is a key
in %ERROR_TEXT.
error_is_bad_group
error_is_bad_publisher
error_is_article_out_of_range
error_is_bad_checksum
Returns true if the ISBN error is that type.
error_text
Returns a text version of the error text
is_valid
Return true if the ISBN is valid, meaning that it has a valid prefix (for ISBN-13),
group code, and publisher code; and its checksum validates.
type
Returns either "ISBN10" or "ISBN13".
prefix
Returns the prefix for the ISBN. This is currently either 978 or 979 for ISBN-13. It
returns the empty string (so, a defined value) for ISBN-10.
group_code
Returns the group code for the ISBN. This is the numerical version, for example, '0'
for the English group. The valid group codes come from "Business::ISBN::Data".
group
Returns the group name for the ISBN. This is the string version. For instance,
'English' for the '0' group. The names come from "Business::ISBN::Data".
publisher_code
Returns the publisher code for the ISBN. This is the numeric version, for instance
'596' for O'Reilly Media.
article_code
Returns the article code for the ISBN. This is the numeric version that uniquely
identifies the item.
article_code_length
Returns the article code length for the ISBN.
article_code_min
Returns the minimum article code length for the publisher code.
article_code_max
Returns the max article code length for the publisher code.
checksum
Returns the checksum code for the ISBN. This checksum may not be valid since you can
create an object an fix the checksum later with "fix_checksum".
is_valid_checksum
Returns "Business::ISBN::GOOD_ISBN" for valid checksums and
"Business::ISBN::BAD_CHECKSUM" otherwise. This does not guarantee that the rest of the
ISBN is actually assigned to a book.
fix_checksum
Checks the checksum and modifies the ISBN to set it correctly if needed.
as_string(), as_string([])
Return the ISBN as a string. This function takes an optional anonymous array (or
array reference) that specifies the placement of hyphens in the string. An empty
anonymous array produces a string with no hyphens. An empty argument list
automatically hyphenates the ISBN based on the discovered group and publisher codes.
An ISBN that is not valid may produce strange results.
The positions specified in the passed anonymous array are only used for one method use
and do not replace the values specified by the constructor. The method assumes that
you know what you are doing and will attempt to use the least three positions
specified. If you pass an anonymous array of several positions, the list will be
sorted and the lowest three positions will be used. Positions less than 1 and greater
than 12 are silently ignored.
A terminating 'x' is changed to 'X'.
as_isbn10
Returns a new ISBN object. If the object is already ISBN-10, this method clones it. If
it is an ISBN-13 with the prefix 978, it returns the ISBN-10 equivalent. For all other
cases it returns undef.
as_isbn13
Returns a new ISBN object. If the object is already ISBN-13, this method clones it. If
it is an ISBN-10, it returns the ISBN-13 equivalent with the 978 prefix.
increment
Returns the next "Business::ISBN" by incrementing the article code of the specified
ISBN (object or scalar).
Returns undef, if the parameter is invalid or equals the maximum possible ISBN for the
publisher.
$isbn = Business::ISBN->new('1565922573'); # 1-56592-257-3
$next_isbn = $isbn->increment; # 1-56592-258-1
If the next article code would exceed the maximum possible article code (such as
incrementing 999 to 1000), this returns ARTICLE_CODE_OUT_OF_RANGE as the error.
decrement
Returns the previous "Business::ISBN" by decrementing the article code of the
specified ISBN (object or scalar).
Returns undef, if the parameter is invalid or equals the minimum possible ISBN for the
publisher.
$isbn = Business::ISBN->new('1565922573'); # 1-56592-257-3
$prev_isbn = $isbn->decrement; # 1-56592-256-5
If the next article code would exceed the maximum possible article code (such as
incrementing 000 to -1), this returns ARTICLE_CODE_OUT_OF_RANGE as the error.
png_barcode
Returns image data in PNG format for the barcode for the ISBN. This works with ISBN-10
and ISBN-13. The ISBN-10s are automaically converted to ISBN-13.
This requires "GD::Barcode::EAN13".
BUGS
TO DO
* i would like to create the bar codes with the price extension
SOURCE AVAILABILITY
This source is in Github:
https://github.com/briandfoy/business-isbn
AUTHOR
brian d foy "<briandfoy@pobox.com>"
COPYRIGHT AND LICENSE
Copyright © 2001-2024, brian d foy <briandfoy@pobox.com>. All rights reserved.
This module is licensed under the Artistic License 2.0. See the LICENSE file in the
distribution, or https://opensource.org/licenses/Artistic-2.0
CREDITS
Thanks to Mark W. Eichin "<eichin@thok.org>" for suggestions and discussions on EAN
support.
Thanks to Andy Lester "<andy@petdance.com>" for lots of bug fixes and testing.
Ed Summers "<esummers@cpan.org>" has volunteered to help with this module.
Markus Spann "<markus_spann@gmx.de>" added "increment" and "decrement".