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 |
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50 | my $arguments =
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51 | [ { 'name' => "input_encoding",
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52 | 'desc' => "{ReadTextFile.input_encoding}",
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53 | 'type' => "enum",
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54 | 'list' => $BasePlugin::encoding_plus_auto_list,
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55 | 'reqd' => "no" ,
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56 | 'deft' => "auto" } ,
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57 | { 'name' => "default_encoding",
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58 | 'desc' => "{ReadTextFile.default_encoding}",
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59 | 'type' => "enum",
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60 | 'list' => $BasePlugin::encoding_list,
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61 | 'reqd' => "no",
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62 | 'deft' => "utf8" },
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63 | { 'name' => "extract_language",
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64 | 'desc' => "{ReadTextFile.extract_language}",
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65 | 'type' => "flag",
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66 | 'reqd' => "no" },
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67 | { 'name' => "default_language",
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68 | 'desc' => "{ReadTextFile.default_language}",
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69 | 'type' => "string",
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70 | 'deft' => "en",
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71 | 'reqd' => "no" },
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72 | { 'name' => "first",
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73 | 'desc' => "{ReadTextFile.first}",
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74 | 'type' => "string",
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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 | 'hiddengli' => "yes" },
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81 | ];
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82 |
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83 |
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84 | my $options = { 'name' => "ReadTextFile",
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85 | 'desc' => "{ReadTxtFile.desc}",
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86 | 'abstract' => "yes",
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87 | 'inherits' => "no",
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88 | 'args' => $arguments };
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89 |
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90 |
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91 |
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92 | sub new {
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93 | my $class = shift (@_);
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94 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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95 | push(@$pluginlist, $class);
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96 |
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97 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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98 | push(@{$hashArgOptLists->{"OptList"}},$options);
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99 |
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100 | my $self = new AutoExtractMetadata($pluginlist, $inputargs, $hashArgOptLists);
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101 |
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102 | return bless $self, $class;
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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 |
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108 | # The ReadTextFile read_into_doc_obj() function. This function does all the
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109 | # right things to make general options work for a given plugin. It reads in
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110 | # a file and sets up a slew of metadata all saved in doc_obj, which
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111 | # it then returns as part of a tuple (process_status,doc_obj)
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112 | #
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113 | # Much of this functionality used to reside in read, but it was broken
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114 | # down into a supporting routine to make the code more flexible.
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115 | #
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116 | # recursive plugins (e.g. RecPlug) and specialized plugins like those
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117 | # capable of processing many documents within a single file (e.g.
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118 | # GMLPlug) will normally want to implement their own version of
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119 | # read_into_doc_obj()
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120 | #
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121 | # Note that $base_dir might be "" and that $file might
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122 | # include directories
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123 | sub read_into_doc_obj {
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124 | my $self = shift (@_);
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125 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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126 |
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127 | my $outhandle = $self->{'outhandle'};
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128 |
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129 | # should we move this to read? What about secondary plugins?
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130 | print STDERR "<Processing n='$file' p='$self->{'plugin_type'}'>\n" if ($gli);
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131 | print $outhandle "$self->{'plugin_type'} processing $file\n"
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132 | if $self->{'verbosity'} > 1;
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133 |
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134 | my ($filename_full_path, $filename_no_path) = $self->get_full_filenames($base_dir, $file);
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135 | # Do encoding stuff
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136 | my ($language, $encoding) = $self->textcat_get_language_encoding ($filename_full_path);
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137 | if ($self->{'verbosity'} > 2) {
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138 | print $outhandle "ReadTextFile: reading $file as ($encoding,$language)\n";
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139 | }
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140 |
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141 | # create a new document
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142 | my $doc_obj = new doc ($filename_full_path, "indexed_doc");
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143 | my $top_section = $doc_obj->get_top_section();
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144 |
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145 | # this should look at the plugin option too...
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146 | $doc_obj->set_OIDtype ($processor->{'OIDtype'}, $processor->{'OIDmetadata'});
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147 | $doc_obj->add_utf8_metadata($top_section, "Plugin", "$self->{'plugin_type'}");
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148 | $doc_obj->add_utf8_metadata($top_section, "FileSize", (-s $filename_full_path));
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149 | $self->set_Source_metadata($doc_obj, $filename_no_path, $encoding);
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150 |
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151 | $doc_obj->add_utf8_metadata($top_section, "Language", $language);
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152 | $doc_obj->add_utf8_metadata($top_section, "Encoding", $encoding);
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153 |
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154 | # read in file ($text will be in utf8)
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155 | my $text = "";
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156 | $self->read_file ($filename_full_path, $encoding, $language, \$text);
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157 |
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158 | if (!length ($text)) {
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159 | if ($gli) {
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160 | print STDERR "<ProcessingError n='$file' r='File contains no text'>\n";
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161 | }
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162 | gsprintf($outhandle, "$self->{'plugin_type'}: {ReadTextFile.file_has_no_text}\n", $filename_full_path) if $self->{'verbosity'};
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163 |
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164 | my $failhandle = $self->{'failhandle'};
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165 | gsprintf($failhandle, "$file: " . ref($self) . ": {ReadTextFile.empty_file}\n");
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166 | # print $failhandle "$file: " . ref($self) . ": file contains no text\n";
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167 | $self->{'num_not_processed'} ++;
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168 |
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169 | return (0,undef); # what should we return here?? error but don't want to pass it on
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170 | }
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171 |
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172 | # do plugin specific processing of doc_obj
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173 | unless (defined ($self->process (\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli))) {
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174 | $text = '';
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175 | undef $text;
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176 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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177 | return (-1,undef);
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178 | }
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179 | $text='';
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180 | undef $text;
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181 |
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182 | # include any metadata passed in from previous plugins
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183 | # note that this metadata is associated with the top level section
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184 | $self->add_associated_files($doc_obj, $filename_full_path);
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185 | $self->extra_metadata ($doc_obj, $top_section, $metadata);
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186 |
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187 | # do any automatic metadata extraction
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188 | $self->auto_extract_metadata ($doc_obj);
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189 |
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190 |
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191 | # if we haven't found any Title so far, assign one
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192 | $self->title_fallback($doc_obj,$top_section,$filename_no_path);
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193 |
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194 | $self->add_OID($doc_obj);
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195 |
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196 | return (1,$doc_obj);
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197 | }
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198 |
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199 | sub auto_extract_metadata {
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200 | my $self = shift(@_);
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201 | my ($doc_obj) = @_;
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202 |
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203 | if ($self->{'first'}) {
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204 | my $thissection = $doc_obj->get_top_section();
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205 | while (defined $thissection) {
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206 | my $text = $doc_obj->get_text($thissection);
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207 | $self->extract_first_NNNN_characters (\$text, $doc_obj, $thissection) if $text =~ /./;
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208 | $thissection = $doc_obj->get_next_section ($thissection);
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209 | }
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210 | }
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211 | $self->SUPER::auto_extract_metadata($doc_obj);
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212 | }
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213 |
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214 | # uses the multiread package to read in the entire file pointed to
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215 | # by filename and loads the resulting text into $$textref. Input text
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216 | # may be in any of the encodings handled by multiread, output text
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217 | # will be in utf8
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218 | sub read_file {
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219 | my $self = shift (@_);
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220 | my ($filename, $encoding, $language, $textref) = @_;
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221 |
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222 | if (!-r $filename)
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223 | {
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224 | my $outhandle = $self->{'outhandle'};
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225 | gsprintf($outhandle, "{ReadTextFile.read_denied}\n", $filename) if $self->{'verbosity'};
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226 | # print $outhandle "Read permission denied for $filename\n" if $self->{'verbosity'};
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227 | return;
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228 | }
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229 | $$textref = "";
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230 | if (!open (FILE, $filename)) {
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231 | gsprintf(STDERR, "ReadTextFile::read_file {ReadTextFile.could_not_open_for_reading} ($!)\n", $filename);
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232 | die "\n";
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233 | }
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234 |
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235 | if ($encoding eq "ascii") {
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236 | undef $/;
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237 | $$textref = <FILE>;
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238 | $/ = "\n";
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239 | } else {
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240 | my $reader = new multiread();
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241 | $reader->set_handle ('ReadTextFile::FILE');
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242 | $reader->set_encoding ($encoding);
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243 | $reader->read_file ($textref);
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244 | #Now segments chinese if the separate_cjk option is set
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245 | if ($self->{'separate_cjk'}) {
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246 | # segment the Chinese words
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247 | $$textref = &cnseg::segment($$textref);
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248 | }
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249 | }
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250 | close FILE;
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251 | }
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252 |
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253 |
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254 | sub textcat_get_language_encoding {
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255 | my $self = shift (@_);
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256 | my ($filename) = @_;
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257 |
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258 |
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259 | my ($language, $encoding, $extracted_encoding);
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260 | if ($self->{'input_encoding'} eq "auto") {
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261 | # use textcat to automatically work out the input encoding and language
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262 | ($language, $encoding) = $self->get_language_encoding ($filename);
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263 | } elsif ($self->{'extract_language'}) {
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264 | # use textcat to get language metadata
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265 | ($language, $extracted_encoding) = $self->get_language_encoding ($filename);
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266 | $encoding = $self->{'input_encoding'};
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267 | # don't print this message for english... english in utf8 is identical
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268 | # to english in iso-8859-1 (except for some punctuation). We don't have
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269 | # a language model for en_utf8, so textcat always says iso-8859-1!
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270 | if ($extracted_encoding ne $encoding && $language ne "en"
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271 | && $self->{'verbosity'}) {
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272 | my $plugin_name = ref ($self);
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273 | my $outhandle = $self->{'outhandle'};
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274 | gsprintf($outhandle, "$plugin_name: {ReadTextFile.wrong_encoding}\n", $filename, $encoding, $extracted_encoding);
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275 | }
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276 | } else {
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277 | $language = $self->{'default_language'};
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278 | $encoding = $self->{'input_encoding'};
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279 | }
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280 |
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281 | return ($language, $encoding);
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282 | }
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283 |
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284 | # Uses textcat to work out the encoding and language of the text in
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285 | # $filename. All html tags are removed before processing.
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286 | # returns an array containing "language" and "encoding"
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287 | sub get_language_encoding {
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288 | my $self = shift (@_);
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289 | my ($filename) = @_;
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290 | my $outhandle = $self->{'outhandle'};
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291 | my $unicode_format = "";
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292 | my $best_language = "";
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293 | my $best_encoding = "";
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294 |
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295 | # read in file
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296 | if (!open (FILE, $filename)) {
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297 | gsprintf(STDERR, "ReadTextFile::get_language_encoding {ReadTextFile.could_not_open_for_reading} ($!)\n", $filename);
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298 | # this is a pretty bad error, but try to continue anyway
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299 | return ($self->{'default_language'}, $self->{'input_encoding'});
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300 | }
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301 | undef $/;
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302 | my $text = <FILE>;
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303 | $/ = "\n";
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304 | close FILE;
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305 |
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306 | # check if first few bytes have a Byte Order Marker
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307 | my $bom=substr($text,0,2); # check 16bit unicode
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308 | if ($bom eq "\xff\xfe") { # little endian 16bit unicode
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309 | $unicode_format="unicode";
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310 | } elsif ($bom eq "\xfe\xff") { # big endian 16bit unicode
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311 | $unicode_format="unicode";
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312 | } else {
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313 | $bom=substr($text,0,3); # check utf-8
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314 | if ($bom eq "\xef\xbb\xbf") { # utf-8 coded FEFF bom
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315 | $unicode_format="utf8";
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316 | # } elsif ($bom eq "\xef\xbf\xbe") { # utf-8 coded FFFE bom. Error!?
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317 | # $unicode_format="utf8";
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318 | }
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319 | }
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320 |
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321 |
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322 | # handle html files specially
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323 | # XXX this doesn't match plugins derived from HTMLPlug (except ConvertTo)
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324 | if (ref($self) eq 'HTMLPlug' ||
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325 | (exists $self->{'converted_to'} && $self->{'converted_to'} eq 'HTML')){
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326 |
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327 | # remove <title>stuff</title> -- as titles tend often to be in English
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328 | # for foreign language documents
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329 | $text =~ s!<title>.*?</title>!!si;
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330 |
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331 | # see if this html file specifies its encoding
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332 | if ($text =~ /^<\?xml.*encoding="(.+?)"/) {
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333 | $best_encoding = $1;
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334 | } elsif ($text =~ /<meta http-equiv.*content-type.*charset=(.+?)"/i) {#"
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335 | $best_encoding = $1;
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336 | }
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337 | if ($best_encoding) { # we extracted an encoding
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338 | $best_encoding =~ s/-+/_/g;
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339 | $best_encoding = lc($best_encoding); # lowercase
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340 | if ($best_encoding eq "utf_8") { $best_encoding = "utf8" }
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341 | $self->{'input_encoding'} = $best_encoding;
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342 | }
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343 |
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344 | # remove all HTML tags
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345 | $text =~ s/<[^>]*>//sg;
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346 | }
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347 |
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348 | # get the language/encoding
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349 | $self->{'textcat'} = new textcat() if (!defined($self->{'textcat'}));
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350 | my $results = $self->{'textcat'}->classify(\$text);
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351 |
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352 | # if textcat returns 3 or less possibilities we'll use the
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353 | # first one in the list - otherwise use the defaults
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354 | if (scalar @$results > 3) {
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355 | if ($unicode_format) { # in case the first had a BOM
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356 | $best_encoding=$unicode_format;
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357 | } else {
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358 | my %guessed_encodings = ();
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359 | foreach my $result (@$results) {
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360 | $result =~ /([^\-]+)$/;
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361 | my $enc=$1;
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362 | if (!defined($guessed_encodings{$enc})) {
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363 | $guessed_encodings{$enc}=0;
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364 | }
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365 | $guessed_encodings{$enc}++;
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366 | }
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367 |
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368 | $guessed_encodings{""}=-1; # for default best_encoding of ""
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369 | foreach my $enc (keys %guessed_encodings) {
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370 | if ($guessed_encodings{$enc} >
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371 | $guessed_encodings{$best_encoding}){
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372 | $best_encoding=$enc;
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373 | }
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374 | }
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375 | }
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376 |
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377 | if ($self->{'input_encoding'} ne 'auto') {
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378 | if ($self->{'extract_language'} && ($self->{'verbosity'}>2)) {
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379 | gsprintf($outhandle,
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380 | "ReadTextFile: {ReadTextFile.could_not_extract_language}\n",
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381 | $filename, $self->{'default_language'});
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382 | }
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383 | $best_language = $self->{'default_language'};
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384 | $best_encoding = $self->{'input_encoding'};
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385 |
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386 | } else {
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387 | if ($self->{'verbosity'}>2) {
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388 | gsprintf($outhandle,
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389 | "ReadTextFile: {ReadTextFile.could_not_extract_language}\n",
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390 | $filename, $self->{'default_language'});
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391 | }
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392 | $best_language = $self->{'default_language'};
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393 | }
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394 | } else { # <= 3 suggestions
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395 | my ($language, $encoding) = $results->[0] =~ /^([^-]*)(?:-(.*))?$/;
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396 | if (!defined $language) {
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397 | if ($self->{'verbosity'}>2) {
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398 | gsprintf($outhandle,
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399 | "ReadTextFile: {ReadTextFile.could_not_extract_language}\n",
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400 | $filename, $self->{'default_language'});
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401 | }
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402 | $language = $self->{'default_language'};
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403 | }
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404 | if (!defined $encoding) {
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405 | if ($self->{'verbosity'}>2) {
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406 | gsprintf($outhandle,
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407 | "ReadTextFile: {ReadTextFile.could_not_extract_encoding}\n",
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408 | $filename, $self->{'default_encoding'});
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409 | }
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410 | $encoding = $self->{'default_encoding'};
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411 | }
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412 | $best_language = $language;
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413 | if (! $best_encoding ) { # may already be set... eg from html meta tag
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414 | $best_encoding = $encoding;
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415 | }
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416 | }
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417 |
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418 | my $text_copy = $text;
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419 | if ($best_encoding =~ /^iso_8859/ && unicode::ensure_utf8(\$text_copy)==0) {
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420 | # the text is valid utf8, so assume that's the real encoding
|
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421 | # (since textcat is based on probabilities)
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422 | $best_encoding = 'utf8';
|
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423 | }
|
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424 |
|
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425 | # check for equivalents where textcat doesn't have some encodings...
|
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426 | # eg MS versions of standard encodings
|
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427 | if ($best_encoding =~ /^iso_8859_(\d+)/) {
|
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428 | my $iso = $1; # which variant of the iso standard?
|
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429 | # iso-8859 sets don't use chars 0x80-0x9f, windows codepages do
|
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430 | if ($text =~ /[\x80-\x9f]/) {
|
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431 | # Western Europe
|
---|
432 | if ($iso == 1 or $iso == 15) { $best_encoding = 'windows_1252' }
|
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433 | elsif ($iso == 2) {$best_encoding = 'windows_1250'} # Central Europe
|
---|
434 | elsif ($iso == 5) {$best_encoding = 'windows_1251'} # Cyrillic
|
---|
435 | elsif ($iso == 6) {$best_encoding = 'windows_1256'} # Arabic
|
---|
436 | elsif ($iso == 7) {$best_encoding = 'windows_1253'} # Greek
|
---|
437 | elsif ($iso == 8) {$best_encoding = 'windows_1255'} # Hebrew
|
---|
438 | elsif ($iso == 9) {$best_encoding = 'windows_1254'} # Turkish
|
---|
439 | }
|
---|
440 | }
|
---|
441 |
|
---|
442 | if ($best_encoding !~ /^(ascii|utf8|unicode)$/ &&
|
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443 | !defined $encodings::encodings->{$best_encoding}) {
|
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444 | if ($self->{'verbosity'}) {
|
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445 | gsprintf($outhandle, "ReadTextFile: {ReadTextFile.unsupported_encoding}\n",
|
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446 | $filename, $best_encoding, $self->{'default_encoding'});
|
---|
447 | }
|
---|
448 | $best_encoding = $self->{'default_encoding'};
|
---|
449 | }
|
---|
450 |
|
---|
451 | return ($best_language, $best_encoding);
|
---|
452 | }
|
---|
453 |
|
---|
454 |
|
---|
455 |
|
---|
456 | # FIRSTNNN: extract the first NNN characters as metadata
|
---|
457 | sub extract_first_NNNN_characters {
|
---|
458 | my $self = shift (@_);
|
---|
459 | my ($textref, $doc_obj, $thissection) = @_;
|
---|
460 |
|
---|
461 | foreach my $size (split /,/, $self->{'first'}) {
|
---|
462 | my $tmptext = $$textref;
|
---|
463 | $tmptext =~ s/^\s+//;
|
---|
464 | $tmptext =~ s/\s+$//;
|
---|
465 | $tmptext =~ s/\s+/ /gs;
|
---|
466 | $tmptext = substr ($tmptext, 0, $size);
|
---|
467 | $tmptext =~ s/\s\S*$/…/;
|
---|
468 | $doc_obj->add_utf8_metadata ($thissection, "First$size", $tmptext);
|
---|
469 | }
|
---|
470 | }
|
---|
471 |
|
---|
472 | # Overridden by exploding plugins (eg. ISISPlug)
|
---|
473 | sub clean_up_after_exploding
|
---|
474 | {
|
---|
475 | my $self = shift(@_);
|
---|
476 | }
|
---|
477 |
|
---|
478 |
|
---|
479 | 1;
|
---|