[28669] | 1 | ###########################################################################
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| 2 | #
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| 3 | # TabSeparatedPlugin.pm -- A plugin for tab-separated metadata files
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright 2006 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 | # Based on CVSPlugin
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| 28 |
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| 29 | package TabSeparatedPlugin;
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| 30 |
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| 31 |
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| 32 | use SplitTextFile;
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| 33 | use MetadataRead;
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| 34 | use strict;
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| 35 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 36 |
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| 37 |
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| 38 | # TabSeparatedPlugin is a sub-class of SplitTextFile.
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| 39 | sub BEGIN {
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| 40 | @TabSeparatedPlugin::ISA = ('MetadataRead', 'SplitTextFile');
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| 41 | }
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| 42 |
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| 43 |
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| 44 | my $arguments =
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| 45 | [ { 'name' => "process_exp",
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[31492] | 46 | 'desc' => "{BaseImporter.process_exp}",
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[28669] | 47 | 'type' => "regexp",
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| 48 | 'reqd' => "no",
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| 49 | 'deft' => &get_default_process_exp() },
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| 50 | { 'name' => "split_exp",
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| 51 | 'desc' => "{SplitTextFile.split_exp}",
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| 52 | 'type' => "regexp",
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| 53 | 'reqd' => "no",
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| 54 | 'deft' => &get_default_split_exp(),
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| 55 | 'hiddengli' => "yes" }
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| 56 | ];
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| 57 |
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| 58 |
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| 59 | my $options = { 'name' => "TabSeparatedPlugin",
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| 60 | 'desc' => "{TabSeparatedPlugin.desc}",
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| 61 | 'abstract' => "no",
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| 62 | 'inherits' => "yes",
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| 63 | 'explodes' => "yes",
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| 64 | 'args' => $arguments };
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| 65 |
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| 66 |
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| 67 | # This plugin processes files with the suffix ".tab"
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| 68 | sub get_default_process_exp {
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| 69 | return q^(?i)(\.tab)$^;
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| 70 | }
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| 71 |
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| 72 |
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| 73 | # This plugin splits the input text by line
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| 74 | sub get_default_split_exp {
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| 75 | return q^\r?\n^;
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| 76 | }
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| 77 |
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| 78 |
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| 79 | sub new
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| 80 | {
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| 81 | my ($class) = shift (@_);
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| 82 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 83 | push(@$pluginlist, $class);
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| 84 |
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| 85 | push(@{$hashArgOptLists->{"ArgList"}}, @{$arguments});
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| 86 | push(@{$hashArgOptLists->{"OptList"}}, $options);
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| 87 |
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| 88 | my $self = new SplitTextFile($pluginlist, $inputargs, $hashArgOptLists);
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| 89 |
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| 90 | return bless $self, $class;
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| 91 | }
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| 92 |
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| 93 |
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| 94 | sub read_file
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| 95 | {
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| 96 | my $self = shift (@_);
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| 97 | my ($filename, $encoding, $language, $textref) = @_;
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| 98 |
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[28782] | 99 | # Read in file the usual ReadTextFile way
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| 100 | # This ensure that $textref is a unicode aware string
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| 101 | $self->SUPER::read_file(@_);
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[28669] | 102 |
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[28782] | 103 | #
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| 104 | # Now top-up the processing of the text with what this plugin
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| 105 | # needs
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| 106 | #
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| 107 |
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[28669] | 108 | # Remove any blank lines so the data is split and processed properly
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| 109 | $$textref =~ s/\n(\s*)\n/\n/g;
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| 110 |
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| 111 | # The first line contains the metadata element names
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| 112 | $$textref =~ s/^(.*?)\r?\n//;
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| 113 | my @tab_file_fields = ();
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| 114 | my $tab_file_field_line = $1 . "\t"; # To make the regular expressions simpler
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| 115 | while ($tab_file_field_line ne "") {
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| 116 | if ($tab_file_field_line =~ s/^(.*?)\t//) {
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| 117 | my $tab_file_field = $1;
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| 118 | $tab_file_field =~ s/ //g; # Remove any spaces from the field names
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| 119 | push(@tab_file_fields, $tab_file_field);
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| 120 | }
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| 121 | # The line must be formatted incorrectly
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| 122 | else {
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| 123 | print STDERR "Error: Badly formatted Tab field line: $tab_file_field_line.\n";
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| 124 | last;
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| 125 | }
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| 126 | }
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| 127 | $self->{'tab_file_fields'} = \@tab_file_fields;
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| 128 | }
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| 129 |
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| 130 |
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| 131 | sub process
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| 132 | {
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| 133 | my $self = shift (@_);
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| 134 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 135 | my $outhandle = $self->{'outhandle'};
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| 136 |
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| 137 | my $section = $doc_obj->get_top_section();
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| 138 | my $tab_line = $$textref;
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| 139 | my @tab_file_fields = @{$self->{'tab_file_fields'}};
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| 140 |
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| 141 | # Add the raw line as the document text
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| 142 | $doc_obj->add_utf8_text($section, $tab_line);
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| 143 |
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| 144 | # Build a hash of metadata name to metadata value for this line
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| 145 | my $i = 0;
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| 146 | $tab_line .= "\t"; # To make the regular expressions simpler
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| 147 | while ($tab_line ne "") {
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| 148 | if ($tab_line =~ s/^(.*?)\t//) {
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| 149 | # Only bother with non-empty values
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| 150 | if ($1 ne "" && defined($tab_file_fields[$i])) {
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| 151 | $doc_obj->add_utf8_metadata($section, $tab_file_fields[$i], $1);
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| 152 | }
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| 153 | }
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| 154 | # The line must be formatted incorrectly
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| 155 | else {
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| 156 | print STDERR "Error: Badly formatted Tab line: $tab_line.\n";
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| 157 | last;
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| 158 | }
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| 159 |
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| 160 | $i++;
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| 161 | }
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| 162 |
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| 163 | # Record was processed successfully
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| 164 | return 1;
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| 165 | }
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| 166 |
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| 167 |
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| 168 | 1;
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