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package PerlIO::via::Skip; |
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#use 5.008004; |
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use strict; |
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use warnings; |
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#use Data::Dumper; |
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require Exporter; |
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our $VERSION = '0.06'; |
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use constant DEFAULTS => ( start => undef , |
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end => undef , |
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maxlines => undef , |
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skippatterns => undef , |
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skipblanklines => 0 , |
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skipcomments => 0 , |
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after => 0 , |
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nread_ => 0 , |
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nwrite_ => 0 , |
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n_ => 0 , |
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bipolar => sub { |
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my $obj = shift; |
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($_[0]..$_[1]) ? ++$obj->{n_} : ($obj->{n_}=0); |
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($obj->{n_} > ($obj->{after}||0)) ? return 1 :0; |
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}, ); |
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sub PUSHED { |
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my ($class, $mode, $fh) = @_ ; |
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($mode =~ /^[rwa]$/) or return -1 ; |
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my $obj = (defined $ENV{ viaSKIP}) |
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? bless { DEFAULTS, %{$ENV{ viaSKIP}} } |
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: bless { DEFAULTS } ; |
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# init stuff |
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reset; |
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$obj->{qr_} = [compile_patterns( $obj->{skippatterns} ) ]; |
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$obj->{skipblanklines} and ($obj->{qr_} = [ qr/^\s*$/, @{$obj->{qr_}}]); |
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$obj->{skipcomments} and ($obj->{qr_} = [ qr/^\s*#/, @{$obj->{qr_}}]); |
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0
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($obj->{bipolar})->( $obj, 0, 1 ); |
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(defined $obj->{start}) ? ($obj->{start} = qr/\s*$obj->{start}\s*/) |
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: ($obj->{start} = qr/^/ ); |
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(defined $obj->{ end }) ? ($obj->{ end } = qr/\s*$obj->{ end }\s*/) |
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: ($obj->{ end } = qr/^.\A/ ); |
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$obj; |
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} |
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sub compile_patterns { |
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my $pats = shift; |
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return unless $pats; |
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return qr/$pats/ unless ref $pats; |
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map {qr/$_/} @$pats; |
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} |
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sub FILL { |
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my ($obj, $fh) = @_ ; |
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# stop output if maxlines will be exceeded |
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1
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(defined $obj->{maxlines}) && |
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($obj->{nread_} >= $obj->{maxlines}) && return; |
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1
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2
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local $_ = <$fh>; |
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1
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return undef unless (defined $_); |
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1
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my ($s, $e) = ( $obj->{start} , $obj->{end} ); |
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1
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until ( pattern_check( $obj , $_ ) && |
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($obj->{bipolar})->( $obj, scalar (?$s?), scalar (/$e/) ) |
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){ |
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$_ = <$fh>; |
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$. = $obj->{nread_}; |
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return undef unless (defined $_); |
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} |
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# update stats |
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1
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$. = ++ $obj->{nread_}; |
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1
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$_; |
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} |
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sub pattern_check { |
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# return FALSE if line should be ignored |
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my ($obj, $line) = @_ ; |
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return 1 unless @{$obj->{qr_}}; |
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for (@{$obj->{qr_}} ) { |
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return 0 if $line =~ $_ ; |
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} |
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1; |
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} |
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sub WRITE { |
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my ($obj, $buf, $fh) = @_ ; |
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local $_ = $buf; |
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return 0 if (defined $obj->{maxlines}) && |
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($obj->{nwrite_} >= $obj->{maxlines}); |
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return 0 unless pattern_check( $obj , $_ ); |
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my $s = ?$obj->{start}? ; |
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my $e = /$obj->{end}/ ; |
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#print qq (write: "$_"\n); |
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return 0 unless ($obj->{bipolar})->( $obj , $s , $e ); |
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printf $fh "%s", $buf; |
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++ $obj->{nwrite_}; |
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length ; |
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} |
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105
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1; |
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__END__ |
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# Below is stub documentation for your module. You'd better edit it! |
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109
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=head1 NAME |
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111
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PerlIO::via::Skip - PerlIO layer for skipping lines |
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113
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=head1 SYNOPSIS |
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115
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use PerlIO::via::Skip; |
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117
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$ENV{ viaSKIP} = { start=>'Fiat', end=>'Reno' }; |
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open my $i ,'<:via(Skip)', 'cars' or die $!; |
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120
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121
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$ENV{ viaSKIP} = { start => 'Fiat' , |
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end => undef , |
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maxlines => 10 , |
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after => 0 , |
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skippatterns => [qw( a e )] , |
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skipcomments => 1 , |
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skipblanklines => 1 , } |
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open my $i ,'<:via(Skip)', 'cars' or die $!; |
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130
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131
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=head1 DESCRIPTION |
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133
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This module implements a PerlIO layer that discards lines from |
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IO streams. By default, all lines are accepted and passed-through |
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as if no filters are present. Input filters discard input lines, |
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and output filters discard output lines; therefore, input lines |
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(that meet user's criteria) are excluded from input, and in a similar |
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manner when specified, output lines are omitted from output. |
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140
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The code is re-entrant. Multiple filters can be |
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stacked together without interfering with one another. |
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These filters were designed for read, write, and append handles |
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( 'r', 'w', 'a'), but will refuse installation |
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for read-write mode. |
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146
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=head1 CONFIGURATION |
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148
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In order to stay re-entrant, configuration is done by setting the |
149
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global variable $ENV{viaSKIP} . While other PerlIO modules are |
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usually configured via class variables through import(), I choose |
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to sacrifice pretty syntax for data integrity. During the call to |
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open(), or during binmode(), the filter reads its configuration |
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from the $ENV{viaSKIP} variable; since this is a dynamic value, you |
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probably want to change it before the open(), or binmode() if other |
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filters should read a different configurations. |
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157
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The env variable 'viaSKIP' takes the form of a hash reference. |
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For example: $ENV{ viaSKIP } = { maxlines=> 10, start=>'apple' }; |
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160
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Where 'maxlines', and 'start' are configuration parameters. Here are |
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all the parameters that allow you to alter the characteristics of |
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the filter: |
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164
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maxlines limit the maximum number of input (or output) lines |
165
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skippatterns skip lines containing one of these patterns |
166
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skipblanklines skip whitespace lines |
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skipcomments skip lines with (leading) comments |
168
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start Start a bipolar vibrator. Skip leading lines |
169
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until a certain pattern |
170
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end End a bipolar vibrator. Skip remaining lines |
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after a certain pattern. |
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after Used with a bipolar vibrator. Skip more leading lines, |
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after you find the start pattern. |
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175
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176
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=head2 EXPORT |
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178
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None by default. |
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180
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181
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=head1 SEE ALSO |
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183
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Consult the documentation of the range operator, |
184
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when in scalar context for a description on how |
185
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the bipolar vibrator operates. Note, however, |
186
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that in this implementation the bipolar is designed |
187
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for only full one cycle. (Will need to change |
188
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the range operator from a a m?? regex to a m// regex |
189
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if you need infinite cycles.) |
190
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191
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192
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=head1 AUTHOR |
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194
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Ioannis Tambouras E<lt>ioannis@cpan.org> |
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196
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=head1 COPYRIGHT AND LICENSE |
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198
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Copyright (C) 2005 by Ioannis Tambouras |
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200
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This library is free software; you can redistribute it and/or modify |
201
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it under the same terms as Perl itself, either Perl version 5.8.4 or, |
202
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at your option, any later version of Perl 5 you may have available. |
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204
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205
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=cut |