| 1 | ###########################################################################
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| 2 | #
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| 3 | # PostScriptPlugin.pm -- plugin to process PostScript 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 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 PostScriptPlugin;
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| 27 |
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| 28 | use ConvertBinaryFile;
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| 29 | use ReadTextFile; # for read_file in convert_post_process. do we need it?
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| 30 | use sorttools;
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| 31 |
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| 32 | use strict;
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| 33 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 34 |
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| 35 | sub BEGIN {
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| 36 | @PostScriptPlugin::ISA = ('ConvertBinaryFile', 'ReadTextFile');
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| 37 | }
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| 38 |
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| 39 | my $convert_to_list =
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| 40 | [ { 'name' => "auto",
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| 41 | 'desc' => "{ConvertBinaryFile.convert_to.auto}" },
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| 42 | { 'name' => "text",
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| 43 | 'desc' => "{ConvertBinaryFile.convert_to.text}" },
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| 44 | { 'name' => "pagedimg_jpg",
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| 45 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_jpg}" },
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| 46 | { 'name' => "pagedimg_gif",
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| 47 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_gif}" },
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| 48 | { 'name' => "pagedimg_png",
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| 49 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_png}" }
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| 50 | ];
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| 51 |
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| 52 | my $arguments =
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| 53 | [ { 'name' => "convert_to",
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| 54 | 'desc' => "{ConvertBinaryFile.convert_to}",
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| 55 | 'type' => "enum",
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| 56 | 'reqd' => "yes",
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| 57 | 'list' => $convert_to_list,
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| 58 | 'deft' => "text" },
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| 59 | { 'name' => "process_exp",
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| 60 | 'desc' => "{BasePlugin.process_exp}",
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| 61 | 'type' => "regexp",
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| 62 | 'deft' => &get_default_process_exp(),
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| 63 | 'reqd' => "no" },
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| 64 | { 'name' => "block_exp",
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| 65 | 'desc' => "{BasePlugin.block_exp}",
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| 66 | 'type' => 'regexp',
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| 67 | 'deft' => &get_default_block_exp() },
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| 68 | { 'name' => "extract_date",
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| 69 | 'desc' => "{PostScriptPlugin.extract_date}",
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| 70 | 'type' => "flag" },
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| 71 | { 'name' => "extract_pages",
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| 72 | 'desc' => "{PostScriptPlugin.extract_pages}",
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| 73 | 'type' => "flag" },
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| 74 | { 'name' => "extract_title",
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| 75 | 'desc' => "{PostScriptPlugin.extract_title}",
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| 76 | 'type' => "flag" } ];
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| 77 |
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| 78 | my $options = { 'name' => "PostScriptPlugin",
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| 79 | 'desc' => "{PostScriptPlugin.desc}",
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| 80 | 'abstract' => "no",
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| 81 | 'inherits' => "yes",
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| 82 | 'srcreplaceable' => "yes", # Source docs in postscript format can be replaced with GS-generated html
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| 83 | 'args' => $arguments };
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| 84 |
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| 85 | sub new {
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| 86 | my ($class) = shift (@_);
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| 87 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 88 | push(@$pluginlist, $class);
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| 89 |
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| 90 | push(@$inputargs,"-title_sub");
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| 91 | push(@$inputargs,'^(Page\s+\d+)?(\s*1\s+)?');
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| 92 |
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| 93 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 94 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 95 |
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| 96 | my $self = new ConvertBinaryFile($pluginlist, $inputargs, $hashArgOptLists);
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| 97 |
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| 98 | if ($self->{'info_only'}) {
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| 99 | # don't worry about any options etc
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| 100 | return bless $self, $class;
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| 101 | }
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| 102 |
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| 103 | $self->{'filename_extension'} = "ps";
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| 104 | $self->{'file_type'} = "PS";
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| 105 |
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| 106 | if ($self->{'convert_to'} eq "auto") {
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| 107 | $self->{'convert_to'} = "text";
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| 108 | }
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| 109 |
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| 110 | # set convert_to_plugin and convert_to_ext
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| 111 | $self->ConvertBinaryFile::set_standard_convert_settings();
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| 112 | my $secondary_plugin_name = $self->{'convert_to_plugin'};
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| 113 | my $secondary_plugin_options = $self->{'secondary_plugin_options'};
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| 114 |
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| 115 | if (!defined $secondary_plugin_options->{$secondary_plugin_name}) {
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| 116 | $secondary_plugin_options->{$secondary_plugin_name} = [];
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| 117 | }
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| 118 | my $specific_options = $secondary_plugin_options->{$secondary_plugin_name};
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| 119 |
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| 120 | # following title_sub removes "Page 1" added by ps2ascii, and a leading
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| 121 | # "1", which is often the page number at the top of the page. Bad Luck
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| 122 | # if your document title actually starts with "1 " - is there a better way?
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| 123 | push(@$specific_options, "-title_sub", '^(Page\s+\d+)?(\s*1\s+)?');
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| 124 | push(@$specific_options, "-file_rename_method", "none");
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| 125 |
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| 126 | if ($secondary_plugin_name eq "TextPlugin") {
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| 127 | push(@$specific_options, "-input_encoding", "utf8");
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| 128 | push(@$specific_options,"-extract_language") if $self->{'extract_language'};
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| 129 | } elsif ($secondary_plugin_name eq "PagedImagePlugin") {
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| 130 | push(@$specific_options, "-processing_tmp_files");
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| 131 | }
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| 132 |
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| 133 | $self = bless $self, $class;
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| 134 | # used for convert_post_process
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| 135 | $self->{'input_encoding'} = "auto";
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| 136 | $self->{'default_encoding'} = "utf8";
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| 137 |
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| 138 | $self->load_secondary_plugins($class,$secondary_plugin_options, $hashArgOptLists);
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| 139 |
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| 140 | return $self;
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| 141 | }
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| 142 |
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| 143 |
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| 144 | sub get_default_block_exp {
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| 145 | my $self = shift (@_);
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| 146 |
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| 147 | return q^(?i)\.(eps)$^;
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| 148 | }
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| 149 |
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| 150 | sub get_default_process_exp {
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| 151 | my $self = shift (@_);
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| 152 |
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| 153 | return q^(?i)\.ps$^;
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| 154 | }
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| 155 |
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| 156 | # this has been commented out in other plugins. do we need it here?
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| 157 | # ps files are converted to images (item file should be in utf8) or text (uses pstoascii), so we shouldn't need to ensure utf8
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| 158 | sub convert_post_process
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| 159 | {
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| 160 | my $self = shift (@_);
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| 161 | my ($conv_filename) = @_;
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| 162 |
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| 163 | my $outhandle=$self->{'outhandle'};
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| 164 |
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| 165 | my ($language, $encoding) = $self->textcat_get_language_encoding ($conv_filename);
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| 166 |
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| 167 | # read in file ($text will be in utf8)
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| 168 | my $text = "";
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| 169 | $self->read_file ($conv_filename, $encoding, $language, \$text);
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| 170 |
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| 171 | # turn any high bytes that aren't valid utf-8 into utf-8.
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| 172 | unicode::ensure_utf8(\$text);
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| 173 |
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| 174 | # Write it out again!
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| 175 | $self->utf8_write_file (\$text, $conv_filename);
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| 176 | }
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| 177 |
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| 178 | sub extract_metadata_from_postscript {
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| 179 | my $self = shift (@_);
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| 180 |
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| 181 | my ($filename,$doc) = @_;
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| 182 |
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| 183 | my $section = $doc->get_top_section();
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| 184 |
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| 185 | my $title_found = 0;
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| 186 | my $pages_found = 0;
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| 187 | my $date_found = 0;
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| 188 |
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| 189 | print STDERR "PostScriptPlugin: extracting PostScript metadata from \"$filename\"\n"
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| 190 | if $self->{'verbosity'} > 1;
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| 191 |
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| 192 | open(INPUT, "<$filename");
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| 193 | my $date;
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| 194 |
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| 195 | while(my $line =<INPUT>) {
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| 196 | if ($self->{'extract_title'} && !$title_found) {
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| 197 | foreach my $word ($line =~ m|Title: ([-A-Za-z0-9@/\/\(\):,. ]*)|g) {
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| 198 | my $new_word = $word;
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| 199 | $new_word =~ s/\(Untitled\)//i;
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| 200 | $new_word =~ s/\(Microsoft Word\)//i;
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| 201 | $new_word =~ s/Microsoft Word//i;
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| 202 | $new_word =~ s/^\(//i;
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| 203 | $new_word =~ s/\)$//i;
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| 204 | $new_word =~ s/^ - //i;
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| 205 | if ($new_word ne "") {
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| 206 | $doc->add_utf8_metadata($section, "Title", $new_word );
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| 207 | $title_found = 1;
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| 208 | }
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| 209 | }
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| 210 | }
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| 211 | if ($self->{'extract_date'} && !$date_found) {
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| 212 | foreach my $word ($line =~ m/(Creation[-A-Za-z0-9@\/\(\):,. ]*)/g) {
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| 213 | if ($word =~ m/ ([A-Za-z][A-Za-z][A-Za-z]) ([0-9 ][0-9]) ?[0-9: ]+ ([0-9]{4})/) {
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| 214 | $date = &sorttools::format_date($2,$1,$3);
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| 215 | if (defined $date) {
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| 216 | $doc->add_utf8_metadata($section, "Date", $date );
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| 217 | }
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| 218 | }
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| 219 | if ($word =~ m/D:([0-9]{4})([0-9]{2})([0-9]{2})[0-9]{6}\)/) {
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| 220 | $date = &sorttools::format_date($3,$2,$1);
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| 221 | if (defined $date) {
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| 222 | $doc->add_utf8_metadata($section, "Date", $date );
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| 223 | }
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| 224 | }
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| 225 | if ($word =~ m/CreationDate: ([0-9]{4}) ([A-Za-z][A-Za-z][A-Za-z]) ([0-9 ][0-9]) [0-9:]*/) {
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| 226 | $date = &sorttools::format_date($3,$2,$1);
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| 227 | if (defined $date) {
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| 228 | $doc->add_utf8_metadata($section, "Date", $date );
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| 229 | }
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| 230 | }
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| 231 | $date_found = 1;
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| 232 | }
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| 233 | }
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| 234 | if ($self->{'extract_pages'} && !$pages_found) {
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| 235 | foreach my $word ($line =~ m/(Pages: [0-9]*)/g) {
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| 236 | my $digits = $word;
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| 237 | $digits =~ s/[^0-9]//g;
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| 238 | if ($digits ne "" && $digits ne "0") {
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| 239 | $doc->add_utf8_metadata($section, "Pages", $digits );
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| 240 | $pages_found = 1;
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| 241 | }
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| 242 | }
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| 243 | }
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| 244 | }
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| 245 | }
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| 246 |
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| 247 | # do plugin specific processing of doc_obj
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| 248 | sub process {
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| 249 | my $self = shift (@_);
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| 250 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 251 |
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| 252 | my $filename = &util::filename_cat($base_dir,$file);
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| 253 | $self->extract_metadata_from_postscript($filename, $doc_obj);
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| 254 |
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| 255 | return $self->SUPER::process(@_);
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| 256 |
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| 257 | }
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| 258 |
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| 259 |
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| 260 | 1;
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| 261 |
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