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package WWW::Scraper::ISBN::Driver; |
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134950
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use strict; |
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use warnings; |
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our $VERSION = '1.05'; |
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#---------------------------------------------------------------------------- |
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# Library Modules |
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use Carp; |
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7153
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#---------------------------------------------------------------------------- |
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# Public API |
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# Preloaded methods go here. |
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sub new { |
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my $proto = shift; |
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my $class = ref($proto) || $proto; |
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my $self = { |
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FOUND => 0, |
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VERBOSITY => 0, |
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BOOK => undef, |
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ERROR => '' |
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}; |
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bless ($self, $class); |
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return $self; |
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} |
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sub found { my $self = shift; return $self->_accessor('FOUND',@_) } |
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sub verbosity { my $self = shift; return $self->_accessor('VERBOSITY',@_) } |
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sub book { my $self = shift; return $self->_accessor('BOOK',@_) } |
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sub error { my $self = shift; return $self->_accessor('ERROR',@_) } |
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sub _accessor { |
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my $self = shift; |
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my $accessor = shift; |
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if (@_) { $self->{$accessor} = shift }; |
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return $self->{$accessor}; |
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} |
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sub search { |
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742
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croak(q{Child class must overload 'search()' method.}); |
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} |
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#---------------------------------------------------------------------------- |
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# Internal Class methods |
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# a generic method for storing the error & setting not found |
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sub handler { |
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my $self = shift; |
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if (@_) { |
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$self->{ERROR} = shift; |
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print "Error: $self->{ERROR}\n" if $self->verbosity; |
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}; |
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return $self->found(0); |
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} |
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sub convert_to_ean13 { |
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1
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5926
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my $self = shift; |
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my $isbn = shift || return; |
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my $prefix; |
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100
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return unless(length $isbn == 10 || length $isbn == 13); |
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100
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if(length $isbn == 13) { |
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100
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return if($isbn !~ /^(978|979)(\d{10})$/); |
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($prefix,$isbn) = ($1,$2); |
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} else { |
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100
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return if($isbn !~ /^(\d{10}|\d{9}X)$/); |
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$prefix = '978'; |
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} |
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my $isbn13 = $prefix . $isbn; |
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chop($isbn13); |
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my @isbn = split(//,$isbn13); |
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my ($lsum,$hsum) = (0,0); |
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while(@isbn) { |
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$hsum += shift @isbn; |
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$lsum += shift @isbn; |
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} |
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my $csum = ($lsum * 3) + $hsum; |
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$csum %= 10; |
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100
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$csum = 10 - $csum if($csum != 0); |
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return $isbn13 . $csum; |
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} |
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sub convert_to_isbn10 { |
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1
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my $self = shift; |
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my $ean = shift || return; |
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96
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16
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100
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100
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return unless(length $ean == 10 || length $ean == 13); |
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100
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return if($ean !~ /^(?:978|979)?(\d{9})[\dX]$/); |
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my ($isbn,$isbn10) = ($1,$1); |
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100
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13
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my ($csum, $pos, $digit) = (0, 0, 0); |
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13
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for ($pos = 9; $pos > 0; $pos--) { |
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117
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$digit = $isbn % 10; |
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117
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$isbn /= 10; # Decimal shift ISBN for next time |
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117
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$csum += ($pos * $digit); |
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} |
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13
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$csum %= 11; |
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13
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100
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30
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$csum = 'X' if ($csum == 10); |
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13
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147
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return $isbn10 . $csum; |
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} |
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111
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sub is_valid { |
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my $self = shift; |
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100
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my $isbn = shift or return 0; |
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115
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# validate and convert into EAN13 format |
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10
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my $ean = $self->convert_to_ean13($isbn); |
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10
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100
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return 0 if(!$ean); |
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9
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100
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100
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return 0 if(length $isbn == 13 && $isbn ne $ean); |
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8
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100
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100
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30
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return 0 if(length $isbn == 10 && $isbn ne $self->convert_to_isbn10($ean)); |
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122
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6
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35
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return 1; |
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} |
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1; |
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127
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__END__ |