| 1 | ###########################################################################
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| 2 | #
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| 3 | # ConvertToPlug.pm -- plugin that inherits from HTML or TEXT Plug, depending
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| 4 | # on plugin argument convert_to
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| 5 | #
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| 6 | # A component of the Greenstone digital library software
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| 7 | # from the New Zealand Digital Library Project at the
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| 8 | # University of Waikato, New Zealand.
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| 9 | #
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| 10 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 11 | #
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| 12 | # This program is free software; you can redistribute it and/or modify
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| 13 | # it under the terms of the GNU General Public License as published by
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| 14 | # the Free Software Foundation; either version 2 of the License, or
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| 15 | # (at your option) any later version.
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| 16 | #
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| 17 | # This program is distributed in the hope that it will be useful,
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| 18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | # GNU General Public License for more details.
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| 21 | #
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| 22 | # You should have received a copy of the GNU General Public License
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| 23 | # along with this program; if not, write to the Free Software
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| 24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 25 | #
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| 26 | ###########################################################################
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| 27 |
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| 28 | # The plugin is inherited by such plugins as WordPlug and PDFPlug.
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| 29 | # It facilitates the conversion of these document types to either HTML
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| 30 | # or TEXT by setting up variable that instruct ConvertToBasPlug
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| 31 | # how to work.
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| 32 |
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| 33 | # It works by dynamically inheriting HTMLPlug or TEXTPlug based on
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| 34 | # the plugin argument 'convert_to'. If the argument is not present,
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| 35 | # the default is to inherit HTMLPlug.
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| 36 |
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| 37 |
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| 38 | package ConvertToPlug;
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| 39 |
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| 40 | use BasPlug;
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| 41 | use HTMLPlug;
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| 42 | use TEXTPlug;
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| 43 |
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| 44 | sub BEGIN {
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| 45 | @ISA = ('HTMLPlug');
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| 46 | # @ISA = ('HTMLPlug', 'TEXTPlug');
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| 47 | # @ISA = ('BasPlug'); #, 'HTMLPlug', 'TEXTPlug');
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| 48 | }
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| 49 |
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| 50 | # use strict; # this breaks 'print $outhandle ' error msgs.
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| 51 |
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| 52 | sub print_usage {
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| 53 | my ($plugin_name) = @_;
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| 54 |
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| 55 | # for when this function is called directly by pluginfo.pl
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| 56 | if (ref ($plugin_name)) {
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| 57 | $plugin_name = ref ($plugin_name);
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| 58 | }
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| 59 |
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| 60 | print STDERR "\n usage: plugin $plugin_name [options]\n\n";
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| 61 | print STDERR " options:\n";
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| 62 | print STDERR " -convert_to (html|text) plugin converts to TEXT or HTML\n";
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| 63 | print STDERR " (default html)\n";
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| 64 | }
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| 65 |
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| 66 | sub parse_args
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| 67 | {
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| 68 | my $class = shift (@_);
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| 69 | my ($args) = @_;
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| 70 |
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| 71 | my $plugin_name = $class;
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| 72 | $plugin_name =~ s/\.pm$//;
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| 73 |
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| 74 | my $generate_format;
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| 75 | my $kea_arg;
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| 76 |
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| 77 | if (!parsargv::parse($args,
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| 78 | q^extract_keyphrases^, \$kea_arg->{'kea'}, #with extra options
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| 79 | q^extract_keyphrase_options/.*/^, \$kea_arg->{'kea_options'}, #no extra options
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| 80 | q^convert_to/(html|text)/html^, \$generate_format,
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| 81 | "allow_extra_options")) {
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| 82 |
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| 83 | print STDERR "\nIncorrect options passed to $plugin_name, ";
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| 84 | print STDERR "check your collect.cfg configuration file\n";
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| 85 | &print_usage($plugin_name);
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| 86 | die "\n";
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| 87 | }
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| 88 |
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| 89 | return ($plugin_name,$generate_format, $kea_arg);
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| 90 | }
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| 91 |
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| 92 | sub new {
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| 93 | my $class = shift (@_);
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| 94 | my ($plugin_name,$generate_format, $kea_arg) = $class->parse_args(\@_);
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| 95 | my $self;
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| 96 |
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| 97 | if ($generate_format eq "text")
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| 98 | {
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| 99 | $self = new TEXTPlug ($class, @_);
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| 100 | $self->{'convert_to'} = "TEXT";
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| 101 | $self->{'convert_to_ext'} = "txt";
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| 102 | }
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| 103 | else
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| 104 | {
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| 105 | $self = new HTMLPlug ($class, @_);
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| 106 | $self->{'convert_to'} = "HTML";
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| 107 | $self->{'convert_to_ext'} = "html";
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| 108 |
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| 109 | $self->{'rename_assoc_files'} = 1;
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| 110 | $self->{'metadata_fields'} .= ",GENERATOR";
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| 111 | }
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| 112 |
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| 113 | #if kea data to be extracted...
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| 114 | $self->{'kea'} = 1 if($kea_arg->{'kea'});
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| 115 | $self->{'kea_options'} = 1 if($kea_arg->{'kea_options'});
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| 116 |
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| 117 | return bless $self, $class;
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| 118 | }
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| 119 |
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| 120 |
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| 121 |
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| 122 | # Run conversion utility on the input file.
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| 123 | #
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| 124 | # The conversion takes place in a collection specific 'tmp' directory so
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| 125 | # that we don't accidentally damage the input.
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| 126 | #
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| 127 | # The desired output type is indicated by $output_ext. This is usually
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| 128 | # something like "html" or "word", but can be "best" (or the empty string)
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| 129 | # to indicate that the conversion utility should do the best it can.
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| 130 |
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| 131 | sub tmp_area_convert_file {
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| 132 | my $self = shift (@_);
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| 133 | my ($output_ext,$input_filename, $textref) = @_;
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| 134 |
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| 135 | my $convert_to = $self->{'convert_to'};
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| 136 |
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| 137 | # softlink to collection tmp dir
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| 138 | my $colname = &util::use_collection();
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| 139 | my $tmp_dirname
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| 140 | = &util::filename_cat($ENV{'GSDLHOME'},"collect",$colname,"tmp");
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| 141 | &util::mk_dir($tmp_dirname) if (!-e $tmp_dirname);
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| 142 |
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| 143 | # derive tmp filename from input filename
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| 144 | my ($tailname,$dirname,$suffix)
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| 145 | = File::Basename::fileparse($input_filename,'\.[^\.]+$');
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| 146 |
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| 147 | # Remove any white space from filename -- no risk of name collision, and
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| 148 | # makes later conversion by utils simpler. Leave spaces in path...
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| 149 | $tailname =~ s/\s+//g;
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| 150 |
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| 151 | my $tmp_filename = &util::filename_cat($tmp_dirname,"$tailname$suffix");
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| 152 |
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| 153 | &util::soft_link($input_filename,$tmp_filename);
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| 154 |
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| 155 | my $verbosity = $self->{'verbosity'};
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| 156 | if ($verbosity>0)
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| 157 | {
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| 158 | print STDERR "Converting $tailname$suffix to $convert_to format\n";
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| 159 | }
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| 160 |
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| 161 | # Execute the conversion command and get the type of the result,
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| 162 | # making sure the converter gives us the appropriate output type
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| 163 | my $output_type = lc($convert_to);
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| 164 | my $cmd = "gsConvert.pl -verbose $verbosity -output $output_type \"$tmp_filename\"";
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| 165 | $output_type = `$cmd`;
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| 166 |
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| 167 | # Check STDERR here
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| 168 |
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| 169 | chomp $output_type;
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| 170 | if ($output_type eq "fail") {
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| 171 | print STDERR "Could not convert $tailname$suffix to $convert_to format\n";
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| 172 | return "";
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| 173 | ### exit 1;
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| 174 | }
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| 175 |
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| 176 | # remove symbolic link to original file
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| 177 | &util::rm($tmp_filename);
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| 178 |
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| 179 | # store the *actual* output type and return the output filename
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| 180 | $self->{'convert_to_ext'} = $output_type;
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| 181 | my $output_filename = $tmp_filename;
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| 182 | $output_filename =~ s/$suffix$/.$output_type/;
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| 183 |
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| 184 | return $output_filename;
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| 185 | }
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| 186 |
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| 187 |
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| 188 | # Remove collection specific tmp directory and all its contents.
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| 189 |
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| 190 | sub cleanup_tmp_area {
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| 191 | my $self = shift (@_);
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| 192 |
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| 193 | my $colname = &util::use_collection();
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| 194 | my $tmp_dirname
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| 195 | = &util::filename_cat($ENV{'GSDLHOME'},"collect",$colname,"tmp");
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| 196 | &util::rm_r($tmp_dirname);
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| 197 | &util::mk_dir($tmp_dirname);
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| 198 | }
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| 199 |
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| 200 |
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| 201 |
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| 202 |
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| 203 | # Override BasPlug read
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| 204 | # We don't want to get language encoding stuff until after we've converted
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| 205 | # our file to either TEXT or HTML.
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| 206 | sub read {
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| 207 | my $self = shift (@_);
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| 208 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs) = @_;
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| 209 | # if ($self->is_recursive()) {
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| 210 | # die "BasPlug::read function must be implemented in sub-class for recursive plugins\n";
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| 211 | # }
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| 212 |
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| 213 | my $outhandle = $self->{'outhandle'};
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| 214 |
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| 215 | my $filename = &util::filename_cat($base_dir, $file);
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| 216 | return 0 if $self->{'block_exp'} ne "" && $filename =~ /$self->{'block_exp'}/;
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| 217 | if ($filename !~ /$self->{'process_exp'}/ || !-f $filename) {
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| 218 | return undef;
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| 219 | }
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| 220 | my $plugin_name = ref ($self);
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| 221 | $file =~ s/^[\/\\]+//; # $file often begins with / so we'll tidy it up
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| 222 |
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| 223 | # read in file ($text will be in utf8)
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| 224 | my $text = "";
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| 225 |
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| 226 | my $output_ext = $self->{'convert_to_ext'};
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| 227 | my $conv_filename = $self->tmp_area_convert_file($output_ext,$filename);
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| 228 | if ("$conv_filename" eq "") {return 0;} # allows continue on errors
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| 229 | if (! -e "$conv_filename") {return 0;} # allows continue on errors
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| 230 | $self->{'conv_filename'} = $conv_filename;
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| 231 |
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| 232 | # Do encoding stuff
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| 233 | my ($language, $encoding);
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| 234 | if ($self->{'input_encoding'} eq "auto") {
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| 235 | # use textcat to automatically work out the input encoding and language
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| 236 | ($language, $encoding) = $self->get_language_encoding ($conv_filename);
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| 237 | } elsif ($self->{'extract_language'}) {
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| 238 | # use textcat to get language metadata
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| 239 |
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| 240 | my ($language, $extracted_encoding) = $self->get_language_encoding ($conv_filename);
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| 241 | $encoding = $self->{'input_encoding'};
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| 242 | if ($extracted_encoding ne $encoding && $self->{'verbosity'}) {
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| 243 | print $outhandle "$plugin_name: WARNING: $file was read using $encoding encoding but ";
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| 244 | print $outhandle "appears to be encoded as $extracted_encoding.\n";
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| 245 | }
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| 246 | } else {
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| 247 | $language = $self->{'default_language'};
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| 248 | $encoding = $self->{'input_encoding'};
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| 249 | }
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| 250 |
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| 251 | BasPlug::read_file($self,$conv_filename, $encoding, \$text);
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| 252 | if (!length ($text)) {
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| 253 | print $outhandle "$plugin_name: ERROR: $file contains no text\n" if $self->{'verbosity'};
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| 254 | return 0;
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| 255 | }
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| 256 |
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| 257 | # create a new document
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| 258 | my $doc_obj = new doc ($conv_filename, "indexed_doc");
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| 259 |
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| 260 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Language",
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| 261 | $language);
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| 262 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Encoding",
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| 263 | $encoding);
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| 264 |
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| 265 |
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| 266 | # include any metadata passed in from previous plugins
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| 267 | # note that this metadata is associated with the top level section
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| 268 | $self->extra_metadata ($doc_obj, $doc_obj->get_top_section(), $metadata);
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| 269 | # do plugin specific processing of doc_obj
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| 270 | return undef unless defined ($self->process (\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj));
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| 271 | # do any automatic metadata extraction
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| 272 | $self->auto_extract_metadata ($doc_obj);
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| 273 | # add an OID
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| 274 | $doc_obj->set_OID();
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| 275 | # process the document
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| 276 | $processor->process($doc_obj);
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| 277 | $self->cleanup_tmp_area();
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| 278 |
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| 279 |
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| 280 | return 1;
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| 281 | }
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| 282 |
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| 283 |
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| 284 | # do plugin specific processing of doc_obj for HTML type
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| 285 | sub process_type {
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| 286 | my $self = shift (@_);
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| 287 | my ($doc_ext, $textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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| 288 |
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| 289 | my $conv_filename = $self->{'conv_filename'};
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| 290 | my $tmp_dirname = File::Basename::dirname($conv_filename);
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| 291 | my $tmp_tailname = File::Basename::basename($conv_filename);
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| 292 |
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| 293 | my $convert_to = $self->{'convert_to'};
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| 294 | my $ret_val;
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| 295 |
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| 296 | if ($convert_to eq "TEXT")
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| 297 | {
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| 298 |
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| 299 | $ret_val = TEXTPlug::process($self,$textref,$pluginfo,
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| 300 | $tmp_dirname,$tmp_tailname,
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| 301 | $metadata,$doc_obj);
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| 302 | }
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| 303 | else
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| 304 | {
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| 305 | $ret_val = HTMLPlug::process($self,$textref,$pluginfo,
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| 306 | $tmp_dirname,$tmp_tailname,
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| 307 | $metadata,$doc_obj);
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| 308 | }
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| 309 |
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| 310 | # associate original file with doc object
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| 311 | my $cursection = $doc_obj->get_top_section();
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| 312 | my $filename = &util::filename_cat($base_dir,$file);
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| 313 | $doc_obj->associate_file($filename, "doc.$doc_ext", undef, $cursection);
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| 314 |
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| 315 | my $doclink = "<a href=_httpcollection_/index/assoc/[archivedir]/doc.$doc_ext>";
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| 316 | $doc_obj->add_utf8_metadata ($cursection, "srclink", $doclink);
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| 317 | $doc_obj->add_utf8_metadata ($cursection, "srcicon", "_icon".$doc_ext."_");
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| 318 | $doc_obj->add_utf8_metadata ($cursection, "/srclink", "</a>");
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| 319 | return $ret_val;
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| 320 | }
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| 321 |
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| 322 | 1;
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