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#!/usr/bin/perl |
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#------------------------------------------------------------------------------- |
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# Generate a unique but stable name from a string |
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# Philip R Brenan at gmail dot com, Appa Apps Ltd, 2016 |
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#------------------------------------------------------------------------------- |
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# podDocumentation |
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package Data::Unique::Name; |
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require v5.16.0; |
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use warnings FATAL => qw(all); |
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use strict; |
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use Carp; |
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our $VERSION = '20170810'; |
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#1 Constructor |
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sub new($) # Construct a new set of unique names |
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{my ($length) = @_; # Maximum length of generated names |
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bless {length=>$length, count=>{}} |
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} |
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#1 Methods |
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sub generateUniqueName($$) # Generate a unique name corresponding to a string |
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{my ($set, $string) = @_; # Set of unique strings, string |
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my $l = $set->{length}; |
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my $s = $string =~ s/\W//gsr =~ s/\d+\Z//sr; |
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$s = substr($s, 0, $l) if length($s) > $l; |
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if (my $n = $set->{count}{$s}) |
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{$set->{count}{$s}++; |
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return $s.$n; |
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} |
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$set->{count}{$s}++; |
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$s |
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} |
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# podDocumentation |
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#------------------------------------------------------------------------------- |
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# Export |
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#------------------------------------------------------------------------------- |
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require Exporter; |
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use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
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@ISA = qw(Exporter); |
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@EXPORT = qw(); |
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@EXPORT_OK = qw(); |
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%EXPORT_TAGS = (all=>[@EXPORT, @EXPORT_OK]); |
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=encoding utf-8 |
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=head1 Name |
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Data::Unique::Name - Generate a unique but stable name from a string |
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=head1 Synopsis |
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use Data::Unique::Name; |
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my $u = Data::Unique::Name::new(4); |
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ok $u->generateUniqueName("aaaa") eq "aaaa"; |
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ok $u->generateUniqueName("aaaa") eq "aaaa1"; |
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ok $u->generateUniqueName("aaaa1") eq "aaaa2"; |
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ok $u->generateUniqueName("aaaa2") eq "aaaa3"; |
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ok $u->generateUniqueName("aaaab") eq "aaaa4"; |
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ok $u->generateUniqueName("a a a a b") eq "aaaa5"; |
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ok $u->generateUniqueName("a-a(a)/ab") eq "aaaa6"; |
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ok $u->generateUniqueName("bbbbb") eq "bbbb"; |
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ok $u->generateUniqueName("bbbbbb") eq "bbbb1"; |
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ok $u->generateUniqueName("bbbbbbb") eq "bbbb2"; |
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=head1 Description |
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=head2 Constructor |
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=head3 new |
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Construct a new set of unique names |
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1 $length Maximum length of generated names # File name to be used on S3 |
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=head2 Methods |
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=head3 generateUniqueName |
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Generate a unique name corresponding to a string |
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1 $set Set of unique strings |
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2 $string String |
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=head1 Index |
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=head1 Installation |
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This module is written in 100% Pure Perl and, thus, it is easy to read, use, |
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modify and install. |
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Standard Module::Build process for building and installing modules: |
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perl Build.PL |
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./Build |
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./Build test |
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./Build install |
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=head1 Author |
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=head1 Copyright |
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Copyright (c) 2016-2017 Philip R Brenan. |
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This module is free software. It may be used, redistributed and/or modified |
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under the same terms as Perl itself. |
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=cut |
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# Tests and documentation |
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sub test |
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{my $p = __PACKAGE__; |
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return if eval "eof(${p}::DATA)"; |
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my $s = eval "join('', <${p}::DATA>)"; |
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$@ and die $@; |
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eval $s; |
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$@ and die $@; |
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} |
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test unless caller; |
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1; |
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__DATA__ |