| 1 | ###########################################################################
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| 2 | #
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| 3 | # ReadTxtFile.pm -- base class for import plugins that have plain text files
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999-2005 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 |
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| 26 | package ReadTextFile;
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| 27 |
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| 28 | use strict;
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| 29 | no strict 'subs';
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| 30 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 31 |
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| 32 |
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| 33 | use multiread;
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| 34 | use encodings;
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| 35 | use unicode;
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| 36 | use cnseg;
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| 37 | use textcat;
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| 38 | use doc;
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| 39 | eval "require diagnostics"; # some perl distros (eg mac) don't have this
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| 40 | use ghtml;
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| 41 | use gsprintf 'gsprintf';
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| 42 |
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| 43 | use AutoExtractMetadata;
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| 44 |
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| 45 | sub BEGIN {
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| 46 | @ReadTextFile::ISA = ( 'AutoExtractMetadata' );
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| 47 | }
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| 48 |
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| 49 | my $encoding_plus_auto_list =
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| 50 | [ { 'name' => "auto",
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| 51 | 'desc' => "{ReadTextFile.input_encoding.auto}" } ];
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| 52 | push(@{$encoding_plus_auto_list},@{$BasePlugin::encoding_list});
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| 53 |
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| 54 | my $arguments =
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| 55 | [ { 'name' => "input_encoding",
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| 56 | 'desc' => "{ReadTextFile.input_encoding}",
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| 57 | 'type' => "enum",
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| 58 | 'list' => $encoding_plus_auto_list,
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| 59 | 'reqd' => "no" ,
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| 60 | 'deft' => "auto" } ,
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| 61 | { 'name' => "default_encoding",
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| 62 | 'desc' => "{ReadTextFile.default_encoding}",
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| 63 | 'type' => "enum",
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| 64 | 'list' => $BasePlugin::encoding_list,
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| 65 | 'reqd' => "no",
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| 66 | 'deft' => "utf8" },
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| 67 | { 'name' => "extract_language",
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| 68 | 'desc' => "{ReadTextFile.extract_language}",
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| 69 | 'type' => "flag",
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| 70 | 'reqd' => "no" },
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| 71 | { 'name' => "default_language",
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| 72 | 'desc' => "{ReadTextFile.default_language}",
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| 73 | 'type' => "string",
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| 74 | 'deft' => "en",
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| 75 | 'reqd' => "no" },
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| 76 | { 'name' => "separate_cjk",
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| 77 | 'desc' => "{ReadTextFile.separate_cjk}",
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| 78 | 'type' => "flag",
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| 79 | 'reqd' => "no"},
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| 80 | ];
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| 81 |
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| 82 |
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| 83 | my $options = { 'name' => "ReadTextFile",
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| 84 | 'desc' => "{ReadTextFile.desc}",
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| 85 | 'abstract' => "yes",
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| 86 | 'inherits' => "no",
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| 87 | 'args' => $arguments };
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| 88 |
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| 89 |
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| 90 |
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| 91 | sub new {
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| 92 | my $class = shift (@_);
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| 93 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 94 | push(@$pluginlist, $class);
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| 95 |
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| 96 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 97 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 98 |
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| 99 | my $self = new AutoExtractMetadata($pluginlist, $inputargs, $hashArgOptLists);
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| 100 |
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| 101 | return bless $self, $class;
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| 102 |
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| 103 | }
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| 104 |
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| 105 |
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| 106 |
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| 107 | # The ReadTextFile read_into_doc_obj() function. This function does all the
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| 108 | # right things to make general options work for a given plugin. It reads in
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| 109 | # a file and sets up a slew of metadata all saved in doc_obj, which
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| 110 | # it then returns as part of a tuple (process_status,doc_obj)
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| 111 | #
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| 112 | # Much of this functionality used to reside in read, but it was broken
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| 113 | # down into a supporting routine to make the code more flexible.
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| 114 | #
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| 115 | # recursive plugins (e.g. RecPlug) and specialized plugins like those
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| 116 | # capable of processing many documents within a single file (e.g.
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| 117 | # GMLPlug) will normally want to implement their own version of
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| 118 | # read_into_doc_obj()
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| 119 | #
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| 120 | # Note that $base_dir might be "" and that $file might
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| 121 | # include directories
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| 122 | sub read_into_doc_obj {
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| 123 | my $self = shift (@_);
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| 124 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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| 125 |
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| 126 | my $outhandle = $self->{'outhandle'};
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| 127 |
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| 128 | # should we move this to read? What about secondary plugins?
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| 129 | print STDERR "<Processing n='$file' p='$self->{'plugin_type'}'>\n" if ($gli);
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| 130 | print $outhandle "$self->{'plugin_type'} processing $file\n"
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| 131 | if $self->{'verbosity'} > 1;
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| 132 |
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| 133 | my ($filename_full_path, $filename_no_path) = $self->get_full_filenames($base_dir, $file);
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| 134 | # Do encoding stuff
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| 135 | my ($language, $encoding) = $self->textcat_get_language_encoding ($filename_full_path);
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| 136 | if ($self->{'verbosity'} > 2) {
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| 137 | print $outhandle "ReadTextFile: reading $file as ($encoding,$language)\n";
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| 138 | }
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| 139 |
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| 140 | # create a new document
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| 141 | my $doc_obj = new doc ($filename_full_path, "indexed_doc");
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| 142 | my $top_section = $doc_obj->get_top_section();
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| 143 |
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| 144 | # this should look at the plugin option too...
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| 145 | $doc_obj->set_OIDtype ($processor->{'OIDtype'}, $processor->{'OIDmetadata'});
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| 146 | $doc_obj->add_utf8_metadata($top_section, "Plugin", "$self->{'plugin_type'}");
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| 147 | $doc_obj->add_utf8_metadata($top_section, "FileSize", (-s $filename_full_path));
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| 148 | $self->set_Source_metadata($doc_obj, $filename_no_path, $encoding);
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| 149 |
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| 150 | $doc_obj->add_utf8_metadata($top_section, "Language", $language);
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| 151 | $doc_obj->add_utf8_metadata($top_section, "Encoding", $encoding);
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| 152 |
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| 153 | # read in file ($text will be in utf8)
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| 154 | my $text = "";
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| 155 | $self->read_file ($filename_full_path, $encoding, $language, \$text);
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| 156 |
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| 157 | if (!length ($text)) {
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| 158 | if ($gli) {
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| 159 | print STDERR "<ProcessingError n='$file' r='File contains no text'>\n";
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| 160 | }
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| 161 | gsprintf($outhandle, "$self->{'plugin_type'}: {ReadTextFile.file_has_no_text}\n", $filename_full_path) if $self->{'verbosity'};
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| 162 |
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| 163 | my $failhandle = $self->{'failhandle'};
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| 164 | gsprintf($failhandle, "$file: " . ref($self) . ": {ReadTextFile.empty_file}\n");
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| 165 | # print $failhandle "$file: " . ref($self) . ": file contains no text\n";
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| 166 | $self->{'num_not_processed'} ++;
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| 167 |
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| 168 | return (0,undef); # what should we return here?? error but don't want to pass it on
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| 169 | }
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| 170 |
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| 171 | # do plugin specific processing of doc_obj
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| 172 | unless (defined ($self->process (\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli))) {
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| 173 | $text = '';
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| 174 | undef $text;
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| 175 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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| 176 | return (-1,undef);
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| 177 | }
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| 178 | $text='';
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| 179 | undef $text;
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| 180 |
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| 181 | # include any metadata passed in from previous plugins
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| 182 | # note that this metadata is associated with the top level section
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| 183 | $self->add_associated_files($doc_obj, $filename_full_path);
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| 184 | $self->extra_metadata ($doc_obj, $top_section, $metadata);
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| 185 |
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| 186 | # do any automatic metadata extraction
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| 187 | $self->auto_extract_metadata ($doc_obj);
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| 188 |
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| 189 |
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| 190 | # if we haven't found any Title so far, assign one
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| 191 | $self->title_fallback($doc_obj,$top_section,$filename_no_path);
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| 192 |
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| 193 | $self->add_OID($doc_obj);
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| 194 |
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| 195 | return (1,$doc_obj);
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| 196 | }
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| 197 |
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| 198 | # uses the multiread package to read in the entire file pointed to
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| 199 | # by filename and loads the resulting text into $$textref. Input text
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| 200 | # may be in any of the encodings handled by multiread, output text
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| 201 | # will be in utf8
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| 202 | sub read_file {
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| 203 | my $self = shift (@_);
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| 204 | my ($filename, $encoding, $language, $textref) = @_;
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| 205 |
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| 206 | if (!-r $filename)
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| 207 | {
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| 208 | my $outhandle = $self->{'outhandle'};
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| 209 | gsprintf($outhandle, "{ReadTextFile.read_denied}\n", $filename) if $self->{'verbosity'};
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| 210 | # print $outhandle "Read permission denied for $filename\n" if $self->{'verbosity'};
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| 211 | return;
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| 212 | }
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| 213 | $$textref = "";
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| 214 | if (!open (FILE, $filename)) {
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| 215 | gsprintf(STDERR, "ReadTextFile::read_file {ReadTextFile.could_not_open_for_reading} ($!)\n", $filename);
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| 216 | die "\n";
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| 217 | }
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| 218 |
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| 219 | if ($encoding eq "ascii") {
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| 220 | undef $/;
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| 221 | $$textref = <FILE>;
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| 222 | $/ = "\n";
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| 223 | } else {
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| 224 | my $reader = new multiread();
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| 225 | $reader->set_handle ('ReadTextFile::FILE');
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| 226 | $reader->set_encoding ($encoding);
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| 227 | $reader->read_file ($textref);
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| 228 | #Now segments chinese if the separate_cjk option is set
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| 229 | if ($self->{'separate_cjk'}) {
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| 230 | # segment the Chinese words
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| 231 | $$textref = &cnseg::segment($$textref);
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| 232 | }
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| 233 | }
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| 234 | close FILE;
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| 235 | }
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| 236 |
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| 237 |
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| 238 | sub textcat_get_language_encoding {
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| 239 | my $self = shift (@_);
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| 240 | my ($filename) = @_;
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| 241 |
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| 242 |
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| 243 | my ($language, $encoding, $extracted_encoding);
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| 244 | if ($self->{'input_encoding'} eq "auto") {
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| 245 | # use textcat to automatically work out the input encoding and language
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| 246 | ($language, $encoding) = $self->get_language_encoding ($filename);
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| 247 | } elsif ($self->{'extract_language'}) {
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| 248 | # use textcat to get language metadata
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| 249 | ($language, $extracted_encoding) = $self->get_language_encoding ($filename);
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| 250 | $encoding = $self->{'input_encoding'};
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| 251 | # don't print this message for english... english in utf8 is identical
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| 252 | # to english in iso-8859-1 (except for some punctuation). We don't have
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| 253 | # a language model for en_utf8, so textcat always says iso-8859-1!
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| 254 | if ($extracted_encoding ne $encoding && $language ne "en"
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| 255 | && $self->{'verbosity'}) {
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| 256 | my $plugin_name = ref ($self);
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| 257 | my $outhandle = $self->{'outhandle'};
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| 258 | gsprintf($outhandle, "$plugin_name: {ReadTextFile.wrong_encoding}\n", $filename, $encoding, $extracted_encoding);
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| 259 | }
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| 260 | } else {
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| 261 | $language = $self->{'default_language'};
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| 262 | $encoding = $self->{'input_encoding'};
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| 263 | }
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| 264 |
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| 265 | return ($language, $encoding);
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| 266 | }
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| 267 |
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| 268 | # Uses textcat to work out the encoding and language of the text in
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| 269 | # $filename. All html tags are removed before processing.
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| 270 | # returns an array containing "language" and "encoding"
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| 271 | sub get_language_encoding {
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| 272 | my $self = shift (@_);
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| 273 | my ($filename) = @_;
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| 274 | my $outhandle = $self->{'outhandle'};
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| 275 | my $unicode_format = "";
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| 276 | my $best_language = "";
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| 277 | my $best_encoding = "";
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| 278 |
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| 279 | # read in file
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| 280 | if (!open (FILE, $filename)) {
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| 281 | gsprintf(STDERR, "ReadTextFile::get_language_encoding {ReadTextFile.could_not_open_for_reading} ($!)\n", $filename);
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| 282 | # this is a pretty bad error, but try to continue anyway
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| 283 | return ($self->{'default_language'}, $self->{'input_encoding'});
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| 284 | }
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| 285 | undef $/;
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| 286 | my $text = <FILE>;
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| 287 | $/ = "\n";
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| 288 | close FILE;
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| 289 |
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| 290 | # check if first few bytes have a Byte Order Marker
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| 291 | my $bom=substr($text,0,2); # check 16bit unicode
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| 292 | if ($bom eq "\xff\xfe") { # little endian 16bit unicode
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| 293 | $unicode_format="unicode";
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| 294 | } elsif ($bom eq "\xfe\xff") { # big endian 16bit unicode
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| 295 | $unicode_format="unicode";
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| 296 | } else {
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| 297 | $bom=substr($text,0,3); # check utf-8
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| 298 | if ($bom eq "\xef\xbb\xbf") { # utf-8 coded FEFF bom
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| 299 | $unicode_format="utf8";
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| 300 | # } elsif ($bom eq "\xef\xbf\xbe") { # utf-8 coded FFFE bom. Error!?
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| 301 | # $unicode_format="utf8";
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| 302 | }
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| 303 | }
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| 304 |
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| 305 |
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| 306 | # handle html files specially
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| 307 | # XXX this doesn't match plugins derived from HTMLPlug (except ConvertTo)
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| 308 | if (ref($self) eq 'HTMLPlugin' ||
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| 309 | (exists $self->{'converted_to'} && $self->{'converted_to'} eq 'HTML')){
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| 310 |
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| 311 | # remove <title>stuff</title> -- as titles tend often to be in English
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| 312 | # for foreign language documents
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| 313 | $text =~ s!<title>.*?</title>!!si;
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| 314 |
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| 315 | # see if this html file specifies its encoding
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| 316 | if ($text =~ /^<\?xml.*encoding="(.+?)"/) {
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| 317 | $best_encoding = $1;
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| 318 | } elsif ($text =~ /<meta http-equiv.*content-type.*charset=(.+?)"/i) {#"
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| 319 | $best_encoding = $1;
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| 320 | }
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| 321 | if ($best_encoding) { # we extracted an encoding
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| 322 | $best_encoding =~ s/-+/_/g;
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| 323 | $best_encoding = lc($best_encoding); # lowercase
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| 324 | if ($best_encoding eq "utf_8") { $best_encoding = "utf8" }
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| 325 | $self->{'input_encoding'} = $best_encoding;
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| 326 | }
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| 327 |
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| 328 | # remove all HTML tags
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| 329 | $text =~ s/<[^>]*>//sg;
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| 330 | }
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| 331 |
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| 332 | # get the language/encoding
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| 333 | $self->{'textcat'} = new textcat() if (!defined($self->{'textcat'}));
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| 334 | my $results = $self->{'textcat'}->classify(\$text);
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| 335 |
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| 336 | # if textcat returns 3 or less possibilities we'll use the
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| 337 | # first one in the list - otherwise use the defaults
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| 338 | if (scalar @$results > 3) {
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| 339 | if ($unicode_format) { # in case the first had a BOM
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| 340 | $best_encoding=$unicode_format;
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| 341 | } else {
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| 342 | my %guessed_encodings = ();
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| 343 | foreach my $result (@$results) {
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| 344 | $result =~ /([^\-]+)$/;
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| 345 | my $enc=$1;
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| 346 | if (!defined($guessed_encodings{$enc})) {
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| 347 | $guessed_encodings{$enc}=0;
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| 348 | }
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| 349 | $guessed_encodings{$enc}++;
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| 350 | }
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| 351 |
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| 352 | $guessed_encodings{""}=-1; # for default best_encoding of ""
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| 353 | foreach my $enc (keys %guessed_encodings) {
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| 354 | if ($guessed_encodings{$enc} >
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| 355 | $guessed_encodings{$best_encoding}){
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| 356 | $best_encoding=$enc;
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| 357 | }
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| 358 | }
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| 359 | }
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| 360 |
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| 361 | if ($self->{'input_encoding'} ne 'auto') {
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| 362 | if ($self->{'extract_language'} && ($self->{'verbosity'}>2)) {
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| 363 | gsprintf($outhandle,
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| 364 | "ReadTextFile: {ReadTextFile.could_not_extract_language}\n",
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| 365 | $filename, $self->{'default_language'});
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| 366 | }
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| 367 | $best_language = $self->{'default_language'};
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| 368 | $best_encoding = $self->{'input_encoding'};
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| 369 |
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| 370 | } else {
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| 371 | if ($self->{'verbosity'}>2) {
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| 372 | gsprintf($outhandle,
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| 373 | "ReadTextFile: {ReadTextFile.could_not_extract_language}\n",
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| 374 | $filename, $self->{'default_language'});
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| 375 | }
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| 376 | $best_language = $self->{'default_language'};
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| 377 | }
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| 378 | } else { # <= 3 suggestions
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| 379 | my ($language, $encoding) = $results->[0] =~ /^([^-]*)(?:-(.*))?$/;
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| 380 | if (!defined $language) {
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| 381 | if ($self->{'verbosity'}>2) {
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| 382 | gsprintf($outhandle,
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| 383 | "ReadTextFile: {ReadTextFile.could_not_extract_language}\n",
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| 384 | $filename, $self->{'default_language'});
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| 385 | }
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| 386 | $language = $self->{'default_language'};
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| 387 | }
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| 388 | if (!defined $encoding) {
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| 389 | if ($self->{'verbosity'}>2) {
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| 390 | gsprintf($outhandle,
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| 391 | "ReadTextFile: {ReadTextFile.could_not_extract_encoding}\n",
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| 392 | $filename, $self->{'default_encoding'});
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| 393 | }
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| 394 | $encoding = $self->{'default_encoding'};
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| 395 | }
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| 396 | $best_language = $language;
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| 397 | if (! $best_encoding ) { # may already be set... eg from html meta tag
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| 398 | $best_encoding = $encoding;
|
|---|
| 399 | }
|
|---|
| 400 | }
|
|---|
| 401 |
|
|---|
| 402 | my $text_copy = $text;
|
|---|
| 403 | if ($best_encoding =~ /^iso_8859/ && unicode::ensure_utf8(\$text_copy)==0) {
|
|---|
| 404 | # the text is valid utf8, so assume that's the real encoding
|
|---|
| 405 | # (since textcat is based on probabilities)
|
|---|
| 406 | $best_encoding = 'utf8';
|
|---|
| 407 | }
|
|---|
| 408 |
|
|---|
| 409 | # check for equivalents where textcat doesn't have some encodings...
|
|---|
| 410 | # eg MS versions of standard encodings
|
|---|
| 411 | if ($best_encoding =~ /^iso_8859_(\d+)/) {
|
|---|
| 412 | my $iso = $1; # which variant of the iso standard?
|
|---|
| 413 | # iso-8859 sets don't use chars 0x80-0x9f, windows codepages do
|
|---|
| 414 | if ($text =~ /[\x80-\x9f]/) {
|
|---|
| 415 | # Western Europe
|
|---|
| 416 | if ($iso == 1 or $iso == 15) { $best_encoding = 'windows_1252' }
|
|---|
| 417 | elsif ($iso == 2) {$best_encoding = 'windows_1250'} # Central Europe
|
|---|
| 418 | elsif ($iso == 5) {$best_encoding = 'windows_1251'} # Cyrillic
|
|---|
| 419 | elsif ($iso == 6) {$best_encoding = 'windows_1256'} # Arabic
|
|---|
| 420 | elsif ($iso == 7) {$best_encoding = 'windows_1253'} # Greek
|
|---|
| 421 | elsif ($iso == 8) {$best_encoding = 'windows_1255'} # Hebrew
|
|---|
| 422 | elsif ($iso == 9) {$best_encoding = 'windows_1254'} # Turkish
|
|---|
| 423 | }
|
|---|
| 424 | }
|
|---|
| 425 |
|
|---|
| 426 | if ($best_encoding !~ /^(ascii|utf8|unicode)$/ &&
|
|---|
| 427 | !defined $encodings::encodings->{$best_encoding}) {
|
|---|
| 428 | if ($self->{'verbosity'}) {
|
|---|
| 429 | gsprintf($outhandle, "ReadTextFile: {ReadTextFile.unsupported_encoding}\n",
|
|---|
| 430 | $filename, $best_encoding, $self->{'default_encoding'});
|
|---|
| 431 | }
|
|---|
| 432 | $best_encoding = $self->{'default_encoding'};
|
|---|
| 433 | }
|
|---|
| 434 |
|
|---|
| 435 | return ($best_language, $best_encoding);
|
|---|
| 436 | }
|
|---|
| 437 |
|
|---|
| 438 |
|
|---|
| 439 |
|
|---|
| 440 | # Overridden by exploding plugins (eg. ISISPlug)
|
|---|
| 441 | sub clean_up_after_exploding
|
|---|
| 442 | {
|
|---|
| 443 | my $self = shift(@_);
|
|---|
| 444 | }
|
|---|
| 445 |
|
|---|
| 446 |
|
|---|
| 447 | 1;
|
|---|
