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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46 | 'desc' => "{BaseImporter.process_exp}",
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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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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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102 |
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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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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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