source: gsdl/trunk/perllib/plugins/PagedImgPlug.pm@ 14176

Last change on this file since 14176 was 14176, checked in by qq6, 14 years ago

modified by Shaoqun

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Line 
1###########################################################################
2#
3# PagedImgPlug.pm -- plugin for sets of images and OCR text that
4# make up a document
5# A component of the Greenstone digital library software
6# from the New Zealand Digital Library Project at the
7# University of Waikato, New Zealand.
8#
9# Copyright (C) 1999 New Zealand Digital Library Project
10#
11# This program is free software; you can redistribute it and/or modify
12# it under the terms of the GNU General Public License as published by
13# the Free Software Foundation; either version 2 of the License, or
14# (at your option) any later version.
15#
16# This program is distributed in the hope that it will be useful,
17# but WITHOUT ANY WARRANTY; without even the implied warranty of
18# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19# GNU General Public License for more details.
20#
21# You should have received a copy of the GNU General Public License
22# along with this program; if not, write to the Free Software
23# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24#
25###########################################################################
26
27# PagedImgPlug
28# processes sequences of images, with optional OCR text
29#
30# This plugin takes *.item files, which contain metadata and lists of image
31# files, and produces a document containing sections, one for each page.
32# The files should be named something.item, then you can have more than one
33# book in a directory. You will need to create these files, one for each
34# document/book.
35#
36#There are two formats for the item files: a plain text format, and an xml
37#format. You can use either format, and can have both formats in the same
38#collection if you like. If you use the plain format, you must not start the
39#file off with <PagedDocument>
40
41#### PLAIN FORMAT
42# The format of the xxx.item file is as follows:
43# The first lines contain any metadata for the whole document
44# <metadata-name>metadata-value
45# eg.
46# <Title>Snail farming
47# <Date>19230102
48# Then comes a list of pages, one page per line, each line has the format
49#
50# pagenum:imagefile:textfile:r
51#
52# page num and imagefile are required. pagenum is used for the Title
53# of the section, and in the display is shown as page <pagenum>.
54# imagefile is the image for the page. textfile is an optional text
55# file containing the OCR (or any) text for the page - this gets added
56# as the text for the section. r is optional, and signals that the image
57# should be rotated 180deg. Eg use this if the image has been made upside down.
58# So an example item file looks like:
59# <Title>Snail farming
60# <Date>19960403
61# 1:p1.gif:p1.txt:
62# 2:p2.gif::
63# 3:p3.gif:p3.txt:
64# 3b:p3b.gif:p3b.txt:r
65# The second page has no text, the fourth page is a back page, and
66# should be rotated.
67#
68
69#### XML FORMAT
70# The xml format looks like the following
71#<PagedDocument>
72#<Metadata name="Title">The Title of the entire document</Metadata>
73#<Page pagenum="1" imgfile="xxx.jpg" txtfile="yyy.jpg">
74#<Metadata name="Title">The Title of this page</Metadata>
75#</Page>
76#... more pages
77#</PagedDocument>
78#PagedDocument contains a list of Pages, Metadata and PageGroups. Any metadata
79#that is not inside another tag will belong to the document.
80#Each Page has a pagenum (not used at the moment), an imgfile and/or a txtfile.
81#These are both optional - if neither is used, the section will have no content.
82#Pages can also have metadata associated with them.
83#PageGroups can be introduced at any point - they can contain Metadata and Pages and other PageGroups. They are used to introduce hierarchical structure into the document.
84#For example
85#<PagedDocument>
86#<PageGroup>
87#<Page>
88#<Page>
89#</PageGroup>
90#<Page>
91#</PagedDocument>
92#would generate a structure like
93#X
94#--X
95# --X
96# --X
97#--X
98#PageGroup tags can also have imgfile/textfile metadata if you like - this way they get some content themselves.
99
100#Currently the XML structure doesn't work very well with the paged document type, unless you use numerical Titles for each section.
101#There is still a bit of work to do on this format:
102#* enable other text file types, eg html, pdf etc
103#* make the document paging work properly
104#* add pagenum as Title unless a Title is present?
105
106# All the supplemetary image amd text files should be in the same folder as
107# the .item file.
108#
109# To display the images instead of the document text, you can use [srcicon]
110# in the DocumentText format statement.
111# For example,
112#
113# format DocumentText "<center><table width=_pagewidth_><tr><td>[srcicon]</td></tr></table></center>"
114#
115# To have it create thumbnail size images, use the '-thumbnail' option.
116# To have it create medium size images for display, use the '-screenview'
117# option. As usual, running
118# 'perl -S pluginfo.pl PagedImgPlug' will list all the options.
119
120# If you want the resulting documents to be presented with a table of
121# contents, use '-documenttype hierarchy', otherwise they will have
122# next and previous arrows, and a goto page X box.
123
124# If you have used -screenview, you can also use [screenicon] in the format
125# statement to display the smaller image. Here is an example that switches
126# between the two:
127#
128# format DocumentText "<center><table width=_pagewidth_><tr><td>{If}{_cgiargp_ eq full,<a href='_httpdocument_&d=_cgiargd_&p=small'>Switch to small version.</a>,<a href='_httpdocument_&d=_cgiargd_&p=full'>Switch to fullsize version</a>}</td></tr><tr><td>{If}{_cgiargp_ eq full,<a href='_httpdocument_&d=_cgiargd_&p=small' title='Switch to small version'>[srcicon]</a>,<a href='_httpdocument_&d=_cgiargd_&p=full' title='Switch to fullsize version'>[screenicon]</a>}</td></tr></table></center>"
129#
130# Additional metadata can be added into the .item files, alternatively you can
131# use normal metadata.xml files, with the name of the xxx.item file as the
132# FileName (only for document level metadata).
133
134package PagedImgPlug;
135
136use XMLPlug;
137use strict;
138no strict 'refs'; # allow filehandles to be variables and viceversa
139
140sub BEGIN {
141 @PagedImgPlug::ISA = ('XMLPlug');
142}
143
144my $type_list =
145 [ { 'name' => "paged",
146 'desc' => "{PagedImgPlug.documenttype.paged}" },
147 { 'name' => "hierarchy",
148 'desc' => "{PagedImgPlug.documenttype.hierarchy}" } ];
149
150my $arguments =
151 [ { 'name' => "process_exp",
152 'desc' => "{BasPlug.process_exp}",
153 'type' => "string",
154 'deft' => &get_default_process_exp(),
155 'reqd' => "no" },
156 { 'name' => "block_exp",
157 'desc' => "{BasPlug.block_exp}",
158 'type' => "string",
159 'deft' => &get_default_block_exp(),
160 'reqd' => "no" },
161 { 'name' => "title_sub",
162 'desc' => "{HTMLPlug.title_sub}",
163 'type' => "string",
164 'deft' => "" },
165 { 'name' => "noscaleup",
166 'desc' => "{ImagePlug.noscaleup}",
167 'type' => "flag",
168 'reqd' => "no" },
169 { 'name' => "thumbnail",
170 'desc' => "{PagedImgPlug.thumbnail}",
171 'type' => "flag",
172 'reqd' => "no" },
173 { 'name' => "thumbnailsize",
174 'desc' => "{ImagePlug.thumbnailsize}",
175 'type' => "int",
176 'deft' => "100",
177 'range' => "1,",
178 'reqd' => "no" },
179 { 'name' => "thumbnailtype",
180 'desc' => "{ImagePlug.thumbnailtype}",
181 'type' => "string",
182 'deft' => "gif",
183 'reqd' => "no" },
184 { 'name' => "screenview",
185 'desc' => "{PagedImgPlug.screenview}",
186 'type' => "flag",
187 'reqd' => "no" },
188 { 'name' => "screenviewsize",
189 'desc' => "{PagedImgPlug.screenviewsize}",
190 'type' => "int",
191 'deft' => "500",
192 'range' => "1,",
193 'reqd' => "no" },
194 { 'name' => "screenviewtype",
195 'desc' => "{PagedImgPlug.screenviewtype}",
196 'type' => "string",
197 'deft' => "jpg",
198 'reqd' => "no" },
199 { 'name' => "converttotype",
200 'desc' => "{ImagePlug.converttotype}",
201 'type' => "string",
202 'deft' => "",
203 'reqd' => "no" },
204 { 'name' => "minimumsize",
205 'desc' => "{ImagePlug.minimumsize}",
206 'type' => "int",
207 'deft' => "100",
208 'range' => "1,",
209 'reqd' => "no" },
210 { 'name' => "headerpage",
211 'desc' => "{PagedImgPlug.headerpage}",
212 'type' => "flag",
213 'reqd' => "no" },
214 { 'name' => "documenttype",
215 'desc' => "{PagedImgPlug.documenttype}",
216 'type' => "enum",
217 'list' => $type_list,
218 'deft' => "paged",
219 'reqd' => "no" } ];
220
221
222my $options = { 'name' => "PagedImgPlug",
223 'desc' => "{PagedImgPlug.desc}",
224 'abstract' => "no",
225 'inherits' => "yes",
226 'args' => $arguments };
227
228sub new {
229 my ($class) = shift (@_);
230 my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
231 push(@$pluginlist, $class);
232
233 if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
234 if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
235
236 my $self = new XMLPlug($pluginlist, $inputargs, $hashArgOptLists);
237
238 return bless $self, $class;
239}
240
241sub get_default_process_exp {
242 my $self = shift (@_);
243
244 return q^\.item$^;
245}
246
247sub get_doctype {
248 my $self = shift(@_);
249
250 return "PagedDocument";
251}
252
253
254# want to block everything except the .item ones
255# but instead we will block images and txt files
256sub get_default_block_exp {
257 my $self = shift (@_);
258
259 return q^(?i)(\.jpe?g|\.gif|\.png|\.tif?f|\.te?xt|~)$^
260}
261
262# Create the thumbnail and screenview images, and discover the Image's
263# size, width, and height using the convert utility.
264sub process_image {
265 my $self = shift (@_);
266 my $filename = shift (@_); # filename with full path
267 my $srcfile = shift (@_); # filename without path
268 my $doc_obj = shift (@_);
269 my $section = shift (@_); #the current section
270 my $rotate = shift (@_); # whether to rotate the image or not
271 $rotate = 0 unless defined $rotate;
272
273 # check that the image file exists!!
274 if (!-f $filename) {
275 print "PagedImgPlug: ERROR: File $filename does not exist, skipping\n";
276 return 0;
277 }
278
279 my $top=0;
280 if ($section eq $doc_obj->get_top_section()) {
281 $top=1;
282 }
283 my $verbosity = $self->{'verbosity'};
284 my $outhandle = $self->{'outhandle'};
285
286 # check the filename is okay
287 return 0 if ($srcfile eq "" || $filename eq "");
288
289 my $minimumsize = $self->{'minimumsize'};
290 if (defined $minimumsize && (-s $filename < $minimumsize)) {
291 print $outhandle "PagedImgPlug: \"$filename\" too small, skipping\n"
292 if ($verbosity > 1);
293 }
294
295 # Convert the image to a new type (if required), and rotate if required.
296 my $converttotype = $self->{'converttotype'};
297 my $originalfilename = ""; # only set if we do a conversion
298 my $type = "unknown";
299 my $converted = 0;
300 my $rotated=0;
301
302 if ($converttotype ne "" && $filename !~ /$converttotype$/) {
303 $converted=1;
304 $originalfilename = $filename;
305 my $filehead = &util::get_tmp_filename();
306 $filename = $filehead . ".$converttotype";
307 my $n = 1;
308 while (-e $filename) {
309 $filename = "$filehead$n\.$converttotype";
310 $n++;
311 }
312 $self->{'tmp_filename1'} = $filename;
313
314 my $rotate_option = "";
315 if ($rotate eq "r") {
316 $rotate_option = "-rotate 180 ";
317 }
318
319 my $command = "convert -verbose \"$originalfilename\" $rotate_option \"$filename\"";
320 print $outhandle "CONVERT: $command\n" if ($verbosity > 2);
321 my $result = '';
322 $result = `$command`;
323 print $outhandle "CONVERT RESULT = $result\n" if ($verbosity > 2);
324
325 $type = $converttotype;
326 } elsif ($rotate eq "r") {
327 $rotated=1;
328 $originalfilename = $filename;
329 $filename = &util::get_tmp_filename();
330
331 my $command = "convert \"$originalfilename\" -rotate 180 \"$filename\"";
332 print $outhandle "ROTATE: $command\n" if ($verbosity > 2);
333 my $result = '';
334 $result = `$command`;
335 print $outhandle "ROTATE RESULT = $result\n" if ($verbosity > 2);
336
337 }
338
339
340 # Add the image metadata
341 my $file; # the new file name
342 my $id = $srcfile;
343 $id =~ s/\.([^\.]*)$//; # the new file name without an extension
344 if ($converted) {
345 # we have converted the image
346 # add on the new extension
347 $file .= "$id.$converttotype";
348 } else {
349 $file = $srcfile;
350 }
351
352 my $url =$file; # the new file name prepared for a url
353 my $srcurl = $srcfile;
354 ##$url =~ s/ /%20/g;
355 ##$srcurl =~ s/ /%20/g;
356
357 $doc_obj->add_metadata ($section, "Image", $url);
358
359 # Also want to set filename as 'Source' metadata to be
360 # consistent with other plugins
361 $doc_obj->add_metadata ($section, "Source", $srcurl);
362
363 my ($image_type, $image_width, $image_height, $image_size)
364 = &identify($filename, $outhandle, $verbosity);
365
366 $doc_obj->add_metadata ($section, "ImageType", $image_type);
367 $doc_obj->add_metadata ($section, "ImageWidth", $image_width);
368 $doc_obj->add_metadata ($section, "ImageHeight", $image_height);
369 $doc_obj->add_metadata ($section, "ImageSize", $image_size);
370 $doc_obj->add_metadata ($section, "FileFormat", "PagedImg");
371 # add NoText metadata which can be used to suppress the dummy text
372 $doc_obj->add_metadata ($section, "NoText", "1");
373
374 if ($type eq "unknown" && $image_type) {
375 $type = $image_type;
376 }
377
378 if ($top) {
379 $doc_obj->add_metadata ($section, "srclink",
380 "<a href=\"_httpprefix_/collect/[collection]/index/assoc/[assocfilepath]/[Image]\">");
381 $doc_obj->add_metadata ($section, "srcicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/[assocfilepath]/[Image]\">");
382
383 } else {
384 $doc_obj->add_metadata ($section, "srclink",
385 "<a href=\"_httpprefix_/collect/[collection]/index/assoc/[parent(Top):assocfilepath]/[Image]\">");
386 $doc_obj->add_metadata ($section, "srcicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/[parent(Top):assocfilepath]/[Image]\">");
387
388 }
389 $doc_obj->add_metadata ($section, "/srclink", "</a>");
390
391
392 # Add the image as an associated file
393 $doc_obj->associate_file($filename,$file,"image/$type",$section);
394 print $outhandle "associating file $filename as name $file\n" if ($verbosity > 2);
395
396 if ($self->{'thumbnail'}) {
397 # Make the thumbnail image
398 my $thumbnailsize = $self->{'thumbnailsize'} || 100;
399 my $thumbnailtype = $self->{'thumbnailtype'} || 'gif';
400
401 my $filehead = &util::get_tmp_filename();
402 my $thumbnailfile = $filehead . ".$thumbnailtype";
403 my $n=1;
404 while (-e $thumbnailfile) {
405 $thumbnailfile = $filehead . $n . ".$thumbnailtype";
406 $n++;
407 }
408
409 $self->{'tmp_filename2'} = $thumbnailfile;
410
411 # Generate the thumbnail with convert
412 my $command = "convert -verbose -geometry $thumbnailsize"
413 . "x$thumbnailsize \"$filename\" \"$thumbnailfile\"";
414 print $outhandle "THUMBNAIL: $command\n" if ($verbosity > 2);
415 my $result = '';
416 $result = `$command 2>&1` ;
417 print $outhandle "THUMB RESULT: $result\n" if ($verbosity > 2);
418
419 # Add the thumbnail as an associated file ...
420 if (-e "$thumbnailfile") {
421 $doc_obj->associate_file("$thumbnailfile", $id."thumb.$thumbnailtype", "image/$thumbnailtype",$section);
422 $doc_obj->add_metadata ($section, "ThumbType", $thumbnailtype);
423 $doc_obj->add_metadata ($section, "Thumb", $id."thumb.$thumbnailtype");
424 if ($top) {
425 $doc_obj->add_metadata ($section, "thumbicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/[assocfilepath]/[Thumb]\" width=[ThumbWidth] height=[ThumbHeight]>");
426 } else {
427 $doc_obj->add_metadata ($section, "thumbicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/[parent(Top):assocfilepath]/[Thumb]\" width=[ThumbWidth] height=[ThumbHeight]>");
428 }
429 }
430
431 # Extract Thumnail metadata from convert output
432 if ($result =~ m/[0-9]+x[0-9]+=>([0-9]+)x([0-9]+)/) {
433 $doc_obj->add_metadata ($section, "ThumbWidth", $1);
434 $doc_obj->add_metadata ($section, "ThumbHeight", $2);
435 }
436 }
437 # Make a screen-sized version of the picture if requested
438 if ($self->{'screenview'}) {
439
440 # To do: if the actual image is smaller than the screenview size,
441 # we should use the original !
442
443 my $screenviewsize = $self->{'screenviewsize'} || 500;
444 my $screenviewtype = $self->{'screenviewtype'} || 'jpeg';
445 my $filehead = &util::get_tmp_filename();
446 my $screenviewfilename = $filehead . ".$screenviewtype";
447 my $n=1;
448 while (-e $screenviewfilename) {
449 $screenviewfilename = "$filehead$n\.$screenviewtype";
450 $n++;
451 }
452 $self->{'tmp_filename3'} = $screenviewfilename;
453
454 # make the screenview image
455 my $command = "convert -verbose -geometry $screenviewsize"
456 . "x$screenviewsize \"$filename\" \"$screenviewfilename\"";
457 print $outhandle "SCREENVIEW: $command\n" if ($verbosity > 2);
458 my $result = "";
459 $result = `$command 2>&1` ;
460 print $outhandle "SCREENVIEW RESULT: $result\n" if ($verbosity > 3);
461
462 # get screenview dimensions, size and type
463 if ($result =~ m/[0-9]+x[0-9]+=>([0-9]+)x([0-9]+)/) {
464 $doc_obj->add_metadata ($section, "ScreenWidth", $1);
465 $doc_obj->add_metadata ($section, "ScreenHeight", $2);
466 }elsif ($result =~ m/([0-9]+)x([0-9]+)/) {
467 #if the image hasn't changed size, the previous regex doesn't match
468 $doc_obj->add_metadata ($section, "ScreenWidth", $1);
469 $doc_obj->add_metadata ($section, "ScreenHeight", $2);
470 }
471
472 #add the screenview as an associated file ...
473 if (-e "$screenviewfilename") {
474 $doc_obj->associate_file("$screenviewfilename", $id."sv.$screenviewtype",
475 "image/$screenviewtype",$section);
476 print $outhandle "associating screen file $screenviewfilename as name $id sv.$screenviewtype\n" if ($verbosity > 2);
477
478 $doc_obj->add_metadata ($section, "ScreenType", $screenviewtype);
479 $doc_obj->add_metadata ($section, "Screen", $id."sv.$screenviewtype");
480
481 if ($top) {
482 $doc_obj->add_metadata ($section, "screenicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/[assocfilepath]/[Screen]\" width=[ScreenWidth] height=[ScreenHeight]>");
483 } else {
484 $doc_obj->add_metadata ($section, "screenicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/[parent(Top):assocfilepath]/[Screen]\" width=[ScreenWidth] height=[ScreenHeight]>");
485
486 }
487 } else {
488 print $outhandle "PagedImgPlug: couldn't find \"$screenviewfilename\"\n";
489 }
490 }
491
492 return $type;
493
494
495}
496
497
498
499# Discover the characteristics of an image file with the ImageMagick
500# "identify" command.
501
502sub identify {
503 my ($image, $outhandle, $verbosity) = @_;
504
505 # Use the ImageMagick "identify" command to get the file specs
506 my $command = "identify \"$image\" 2>&1";
507 print $outhandle "$command\n" if ($verbosity > 2);
508 my $result = '';
509 $result = `$command`;
510 print $outhandle "$result\n" if ($verbosity > 3);
511
512 # Read the type, width, and height
513 my $type = 'unknown';
514 my $width = 'unknown';
515 my $height = 'unknown';
516
517 my $image_safe = quotemeta $image;
518 if ($result =~ /^$image_safe (\w+) (\d+)x(\d+)/) {
519 $type = $1;
520 $width = $2;
521 $height = $3;
522 }
523
524 # Read the size
525 my $size = "unknown";
526 if ($result =~ m/^.* ([0-9]+)b/) {
527 $size = $1;
528 } elsif ($result =~ m/^.* ([0-9]+)kb/) {
529 $size = 1024 * $1;
530 }
531
532 print $outhandle "file: $image:\t $type, $width, $height, $size\n"
533 if ($verbosity > 3);
534
535 # Return the specs
536 return ($type, $width, $height, $size);
537}
538
539
540# The PagedImgPlug read() function. This function does all the right things
541# to make general options work for a given plugin. It calls the process()
542# function which does all the work specific to a plugin (like the old
543# read functions used to do). Most plugins should define their own
544# process() function and let this read() function keep control.
545#
546# PagedImgPlug overrides read() because there is no need to read the actual
547# text of the file in, because the contents of the file is not text...
548#
549# Return number of files processed, undef if can't process
550# Note that $base_dir might be "" and that $file might
551# include directories
552
553sub read_into_doc_obj {
554 my $self = shift (@_);
555 my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
556 my $outhandle = $self->{'outhandle'};
557
558 #check process and block exps, smart block, etc
559 my ($block_status,$filename) = $self->read_block(@_);
560 return $block_status if ((!defined $block_status) || ($block_status==0));
561
562 print $outhandle "PagedImgPlug processing \"$filename\"\n"
563 if $self->{'verbosity'} > 1;
564 print STDERR "<Processing n='$file' p='PagedImgPlug'>\n" if ($gli);
565
566 # here we need to decide if we have an old text .item file, or a new xml
567 # .item file - for now the test is if the first non-empty line is
568 # <PagedDocument> then its xml
569 my $xml_version = 0;
570 open (ITEMFILE, $filename) || die "couldn't open $filename\n";
571
572 my $backup_filename = "backup.item";
573 open (BACKUP,">$backup_filename")|| die "couldn't write to $backup_filename\n";
574 my $line = "";
575 my $num = 0;
576 $line = <ITEMFILE>;
577 while ($line !~ /\w/) {
578 $line = <ITEMFILE>;
579 }
580 chomp $line;
581 if ($line =~ /<PagedDocument/) {
582 $xml_version = 1;
583 }
584 close ITEMFILE;
585 open (ITEMFILE, $filename) || die "couldn't open $filename\n";
586 $line = <ITEMFILE>;
587 $line =~ s/^\xEF\xBB\xBF//; # strip BOM
588 $line =~ s/\x0B+//ig;
589 $line =~ s/&/&amp;/g;
590 print BACKUP ($line);
591 #Tidy up the item file some metadata title contains \vt-vertical tab
592 while ($line = <ITEMFILE>) {
593 $line =~ s/\x0B+//ig;
594 $line =~ s/&/&amp;/g;
595 print BACKUP ($line);
596 }
597 close ITEMFILE;
598 close BACKUP;
599 &File::Copy::copy ($backup_filename, $filename);
600 &util::rm($backup_filename);
601
602 my $doc_obj;
603 if ($xml_version) {
604 $file =~ s/^[\/\\]+//; # $file often begins with / so we'll tidy it up
605 $self->{'file'} = $file;
606 $self->{'filename'} = $filename;
607 $self->{'processor'} = $processor;
608 $self->{'metadata'} = $metadata;
609
610 eval {
611 $@ = "";
612 my $xslt = $self->{'xslt'};
613 if (defined $xslt && ($xslt ne "")) {
614 # perform xslt
615 my $transformed_xml = $self->apply_xslt($xslt,$filename);
616
617 # feed transformed file (now in memory as string) into XML parser
618 #$self->{'parser'}->parse($transformed_xml);
619 $self->parse_string($transformed_xml);
620 }
621 else {
622 #$self->{'parser'}->parsefile($filename);
623 $self->parse_file($filename);
624 }
625 };
626
627
628
629 if ($@) {
630
631 # parsefile may either croak somewhere in XML::Parser (e.g. because
632 # the document is not well formed) or die somewhere in XMLPlug or a
633 # derived plugin (e.g. because we're attempting to process a
634 # document whose DOCTYPE is not meant for this plugin). For the
635 # first case we'll print a warning and continue, for the second
636 # we'll just continue quietly
637
638 print STDERR "**** XML Parse Error is: $@\n";
639
640 my ($msg) = $@ =~ /Carp::croak\(\'(.*?)\'\)/;
641 if (defined $msg) {
642 my $outhandle = $self->{'outhandle'};
643 my $plugin_name = ref ($self);
644 print $outhandle "$plugin_name failed to process $file ($msg)\n";
645 }
646
647 # reset ourself for the next document
648 $self->{'section_level'}=0;
649 print STDERR "<ProcessingError n='$file'>\n" if ($gli);
650 return -1; # error during processing
651 }
652 $doc_obj = $self->{'doc_obj'};
653 } else {
654 my ($dir);
655 ($dir, $file) = $filename =~ /^(.*?)([^\/\\]*)$/;
656
657 #process the .item file
658 $doc_obj = $self->process_item($filename, $dir, $file, $processor);
659
660 }
661
662 if ($self->{'cover_image'}) {
663 $self->associate_cover_image($doc_obj, $filename);
664 }
665
666 # include any metadata passed in from previous plugins
667 # note that this metadata is associated with the top level section
668 my $section = $doc_obj->get_top_section();
669 $self->extra_metadata ($doc_obj, $section, $metadata);
670 #my $text="";
671 # do plugin specific processing of doc_obj
672 #unless (defined ($self->process(\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj))) {
673 #print STDERR "<ProcessingError n='$file'>\n" if ($gli);
674 #return -1;
675 #}
676 # do any automatic metadata extraction
677 $self->auto_extract_metadata ($doc_obj);
678
679 $self->{'num_processed'}++;
680 return (1,$doc_obj);
681}
682
683sub read
684{
685 my $self = shift (@_);
686 my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_; my ($process_status,$doc_obj) = $self->read_into_doc_obj(@_);
687
688 if ((defined $process_status) && ($process_status == 1)) {
689 # process the document
690 $processor->process($doc_obj);
691
692 #if(defined($self->{'places_filename'})){
693 # &util::rm($self->{'places_filename'});
694 # $self->{'places_filename'} = undef;
695 #}
696 #$self->{'num_processed'} ++;
697 undef $doc_obj;
698 }
699
700 # clean up temporary files - we do this here instead of in
701 # process_image becuase associated files aren't actually copied
702 # until after process has been run.
703 if (defined $self->{'tmp_filename1'} &&
704 -e $self->{'tmp_filename1'}) {
705 &util::rm($self->{'tmp_filename1'})
706 }
707 if (defined $self->{'tmp_filename2'} &&
708 -e $self->{'tmp_filename2'}) {
709 &util::rm($self->{'tmp_filename2'})
710 }
711 if (defined $self->{'tmp_filename3'} &&
712 -e $self->{'tmp_filename3'}) {
713 &util::rm($self->{'tmp_filename3'})
714 }
715 # if process_status == 1, then the file has been processed.
716 return $process_status;
717}
718
719sub xml_start_tag {
720 my $self = shift(@_);
721 my ($expat, $element) = @_;
722 $self->{'element'} = $element;
723
724 my $doc_obj = $self->{'doc_obj'};
725 if ($element eq "PagedDocument") {
726 $self->{'current_section'} = $doc_obj->get_top_section();
727 } elsif ($element eq "PageGroup" || $element eq "Page") {
728 # create a new section as a child
729 $self->{'current_section'} = $doc_obj->insert_section($doc_obj->get_end_child($self->{'current_section'}));
730 $self->{'num_pages'}++;
731 # assign pagenum as what??
732 my $pagenum = $_{'pagenum'}; #TODO!!
733 if (defined $pagenum) {
734 $doc_obj->set_utf8_metadata_element($self->{'current_section'}, 'PageNum', $pagenum);
735 }
736 my ($imgfile) = $_{'imgfile'};
737 if (defined $imgfile) {
738 $self->process_image($self->{'base_dir'}.$imgfile, $imgfile, $doc_obj, $self->{'current_section'});
739 }
740 my ($txtfile) = $_{'txtfile'};
741 if (defined($txtfile)&& $txtfile ne "") {
742 $self->process_text ($self->{'base_dir'}.$txtfile, $txtfile, $doc_obj, $self->{'current_section'});
743 $doc_obj->set_metadata_element($self->{'current_section'},"NoText","0");
744 } else {
745 # otherwise add in some dummy text
746 #create an empty text string so we don't break downstream plugins
747 my $text = &gsprintf::lookup_string("{BasPlug.dummy_text}",1);
748 $doc_obj->add_utf8_text($self->{'current_section'}, $text);
749 $doc_obj->add_metadata($self->{'current_section'},"NoText","1");
750 }
751 } elsif ($element eq "Metadata") {
752 $self->{'metadata_name'} = $_{'name'};
753 }
754}
755
756sub xml_end_tag {
757 my $self = shift(@_);
758 my ($expat, $element) = @_;
759
760 my $doc_obj = $self->{'doc_obj'};
761 if ($element eq "Page" || $element eq "PageGroup") {
762 # if Title hasn't been assigned, set PageNum as Title
763 if (!defined $doc_obj->get_metadata_element ($self->{'current_section'}, "Title") && defined $doc_obj->get_metadata_element ($self->{'current_section'}, "PageNum" )) {
764 $doc_obj->add_utf8_metadata ($self->{'current_section'}, "Title", $doc_obj->get_metadata_element ($self->{'current_section'}, "PageNum" ));
765 }
766 # move the current section back to the parent
767 $self->{'current_section'} = $doc_obj->get_parent_section($self->{'current_section'});
768 } elsif ($element eq "Metadata") {
769
770 $doc_obj->add_utf8_metadata ($self->{'current_section'}, $self->{'metadata_name'}, $self->{'metadata_value'});
771 $self->{'metadata_name'} = "";
772 $self->{'metadata_value'} = "";
773
774 }
775 # otherwise we ignore the end tag
776}
777
778
779sub xml_text {
780 my $self = shift(@_);
781 my ($expat) = @_;
782
783 if ($self->{'element'} eq "Metadata" && $self->{'metadata_name'}) {
784 $self->{'metadata_value'} .= $_;
785 }
786}
787
788sub xml_doctype {
789}
790
791sub open_document {
792 my $self = shift(@_);
793
794 # create a new document
795 $self->{'doc_obj'} = new doc ($self->{'filename'}, "indexed_doc");
796 my $doc_obj = $self->{'doc_obj'};
797 $doc_obj->set_OIDtype ($self->{'processor'}->{'OIDtype'});
798 my ($dir, $file) = $self->{'filename'} =~ /^(.*?)([^\/\\]*)$/;
799 $self->{'base_dir'} = $dir;
800 $self->{'num_pages'} = 0;
801 my $topsection = $doc_obj->get_top_section();
802 if ($self->{'documenttype'} eq 'paged') {
803 # set the gsdlthistype metadata to Paged - this ensures this document will
804 # be treated as a Paged doc, even if Titles are not numeric
805
806 $doc_obj->set_utf8_metadata_element ($topsection, "gsdlthistype", "Paged");
807 } else {
808 $doc_obj->set_utf8_metadata_element ($topsection, "gsdlthistype", "Hierarchy");
809 }
810
811 $doc_obj->add_metadata ($topsection, "Source", $file);
812 if ($self->{'headerpage'}) {
813 $doc_obj->add_text($topsection, &gsprintf::lookup_string("{BasPlug.dummy_text}"));
814 }
815
816}
817
818sub close_document {
819 my $self = shift(@_);
820 my $doc_obj = $self->{'doc_obj'};
821
822 $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Plugin", "$self->{'plugin_type'}");
823 $doc_obj->add_metadata($doc_obj->get_top_section(), "FileFormat", "PagedImg");
824
825 # add numpages metadata
826 $doc_obj->set_utf8_metadata_element ($doc_obj->get_top_section(), 'NumPages', $self->{'num_pages'});
827
828 # add an OID
829 $doc_obj->set_OID();
830
831}
832
833sub process_item {
834 my $self = shift (@_);
835 my ($filename, $dir, $file, $processor) = @_;
836
837 my $doc_obj = new doc ($filename, "indexed_doc");
838 $doc_obj->set_OIDtype ($processor->{'OIDtype'}, $processor->{'OIDmetadata'});
839 my $topsection = $doc_obj->get_top_section();
840 $doc_obj->add_utf8_metadata($topsection, "Plugin", "$self->{'plugin_type'}");
841 $doc_obj->add_metadata($topsection, "FileFormat", "PagedImg");
842
843 if ($self->{'documenttype'} eq 'paged') {
844 # set the gsdlthistype metadata to Paged - this ensures this document will
845 # be treated as a Paged doc, even if Titles are not numeric
846 $doc_obj->set_utf8_metadata_element ($topsection, "gsdlthistype", "Paged");
847 } else {
848 $doc_obj->set_utf8_metadata_element ($topsection, "gsdlthistype", "Hierarchy");
849 }
850
851 $doc_obj->add_metadata ($topsection, "Source", $file);
852
853 open (ITEMFILE, $filename) || die "couldn't open $filename\n";
854 my $line = "";
855 my $num = 0;
856 while (defined ($line = <ITEMFILE>)) {
857 next unless $line =~ /\w/;
858 chomp $line;
859 next if $line =~ /^#/; # ignore comment lines
860 if ($line =~ /^<([^>]*)>\s*(.*?)\s*$/) {
861 $doc_obj->set_utf8_metadata_element ($topsection, $1, $2);
862 #$meta->{$1} = $2;
863 } else {
864 $num++;
865 # line should be like page:imagefilename:textfilename:r - the r is optional -> means rotate the image 180 deg
866 $line =~ s/^\s+//; #remove space at the front
867 $line =~ s/\s+$//; #remove space at the end
868 my ($pagenum, $imgname, $txtname, $rotate) = split /:/, $line;
869
870 # create a new section for each image file
871 my $cursection = $doc_obj->insert_section($doc_obj->get_end_child($topsection));
872 # the page number becomes the Title
873 $doc_obj->set_utf8_metadata_element($cursection, 'Title', $pagenum);
874
875 # process the image for this page if there is one
876 if (defined $imgname && $imgname ne "") {
877 my $result1 = $self->process_image($dir.$imgname, $imgname, $doc_obj, $cursection, $rotate);
878
879 if (!defined $result1)
880 {
881 print "PagedImgPlug: couldn't process image \"$dir.$imgname\" for item \"$filename\"\n";
882 }
883 }
884 # process the text file if one is there
885 if (defined $txtname && $txtname ne "") {
886 my $result2 = $self->process_text ($dir.$txtname, $txtname, $doc_obj, $cursection);
887
888 if (!defined $result2) {
889 print "PagedImgPlug: couldn't process text file \"$dir.$txtname\" for item \"$filename\"\n";
890 }
891 else{
892 $doc_obj->set_metadata_element($cursection, "NoText", "0");
893 }
894 } else {
895 # otherwise add in some dummy text
896 $doc_obj->add_text($cursection, &gsprintf::lookup_string("{BasPlug.dummy_text}"));
897 # add NoText metadata which can be used to suppress the dummy text
898 }
899 }
900 }
901
902 close ITEMFILE;
903
904 # if we want a header page, we need to add some text into the top section, otherwise this section will become invisible
905 if ($self->{'headerpage'}) {
906 $doc_obj->add_text($topsection, &gsprintf::lookup_string("{BasPlug.dummy_text}"));
907 }
908 $file =~ s/\.item//i;
909 $doc_obj->set_OID ();
910 # add numpages metadata
911 $doc_obj->set_utf8_metadata_element ($topsection, 'NumPages', "$num");
912 return $doc_obj;
913}
914
915sub process_text {
916 my $self = shift (@_);
917 my ($fullpath, $file, $doc_obj, $cursection) = @_;
918
919 # check that the text file exists!!
920 if (!-f $fullpath) {
921 print "PagedImgPlug: ERROR: File $fullpath does not exist, skipping\n";
922 return 0;
923 }
924
925 # Do encoding stuff
926 my ($language, $encoding) = $self->textcat_get_language_encoding ($fullpath);
927
928 my $text="";
929 &BasPlug::read_file($self, $fullpath, $encoding, $language, \$text);
930 if (!length ($text)) {
931 # It's a bit unusual but not out of the question to have no text, so just give a warning
932 print "PagedImgPlug: WARNING: $fullpath contains no text\n";
933 }
934
935 # we need to escape the escape character, or else mg will convert into
936 # eg literal newlines, instead of leaving the text as '\n'
937 $text =~ s/\\/\\\\/g; # macro language
938 $text =~ s/_/\\_/g; # macro language
939 $text =~ s/</&lt;/g;
940 $text =~ s/>/&gt;/g;
941
942 # insert preformat tags and add text to document object
943 $doc_obj->add_utf8_text($cursection, "<pre>\n$text\n</pre>");
944
945 return 1;
946}
947
948# do plugin specific processing of doc_obj
949sub process {
950 my $self = shift (@_);
951 my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
952 my $outhandle = $self->{'outhandle'};
953
954 return 1;
955}
956
9571;
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