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lonpage.pm
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Thu Jun 20 17:47:35 2002 UTC (21 years, 10 months ago) by
sakharuk
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can print pages, but 1. somebody needs to define the width of minipage
inside the table (corresponds to HTML table) 2. if the table is sufficiently
large somebody has to split the table. Now I am trying to resolve these
problems.
1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # $Id: lonpage.pm,v 1.40 2002/06/20 17:47:35 sakharuk Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # (TeX Content Handler
29: #
30: # YEAR=2000
31: # 05/29/00,05/30 Gerd Kortemeyer)
32: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
33: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16,
34: # YEAR=2001
35: # 08/13/01,08/30,10/1 Gerd Kortemeyer
36: # 12/16 Scott Harrison
37: # YEAR=2002
38: # 03/19 Gerd Kortemeyer
39: #
40: ###
41:
42: package Apache::lonpage;
43:
44: use strict;
45: use Apache::Constants qw(:common :http);
46: use Apache::lonnet();
47: use Apache::loncommon();
48: use Apache::lonxml();
49: use HTML::TokeParser;
50: use GDBM_File;
51: use Apache::lonsequence;
52:
53: # -------------------------------------------------------------- Module Globals
54: my %hash;
55: my @rows;
56:
57: # ------------------------------------------------------------------ Euclid gcd
58:
59: sub euclid {
60: my ($e,$f)=@_;
61: my $a; my $b; my $r;
62: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
63: while ($r!=0) {
64: $a=$b; $b=$r;
65: $r=$a%$b;
66: }
67: return $b;
68: }
69:
70: # ------------------------------------------------------------ Build page table
71:
72: sub tracetable {
73: my ($sofar,$rid,$beenhere)=@_;
74: my $further=$sofar;
75: unless ($beenhere=~/\&$rid\&/) {
76: $beenhere.=$rid.'&';
77:
78: if (defined($hash{'is_map_'.$rid})) {
79: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
80: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
81: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
82: $sofar=
83: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
84: '&'.$frid.'&');
85: $sofar++;
86: if ($hash{'src_'.$frid}) {
87: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
88: if (($brepriv eq '2') || ($brepriv eq 'F')) {
89: if (defined($rows[$sofar])) {
90: $rows[$sofar].='&'.$frid;
91: } else {
92: $rows[$sofar]=$frid;
93: }
94: }
95: }
96: }
97: } else {
98: $sofar++;
99: if ($hash{'src_'.$rid}) {
100: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
101: if (($brepriv eq '2') || ($brepriv eq 'F')) {
102: if (defined($rows[$sofar])) {
103: $rows[$sofar].='&'.$rid;
104: } else {
105: $rows[$sofar]=$rid;
106: }
107: }
108: }
109: }
110:
111: if (defined($hash{'to_'.$rid})) {
112: my $mincond=1;
113: my $next='';
114: foreach (split(/\,/,$hash{'to_'.$rid})) {
115: my $thiscond=
116: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
117: if ($thiscond>=$mincond) {
118: if ($next) {
119: $next.=','.$_.':'.$thiscond;
120: } else {
121: $next=$_.':'.$thiscond;
122: }
123: if ($thiscond>$mincond) { $mincond=$thiscond; }
124: }
125: }
126: foreach (split(/\,/,$next)) {
127: my ($linkid,$condval)=split(/\:/,$_);
128: if ($condval>=$mincond) {
129: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
130: if ($now>$further) { $further=$now; }
131: }
132: }
133:
134: }
135: }
136: return $further;
137: }
138:
139: # ================================================================ Main Handler
140:
141: sub handler {
142: my $r=shift;
143:
144: # ------------------------------------------- Set document type for header only
145:
146: if ($r->header_only) {
147: if ($ENV{'browser.mathml'}) {
148: $r->content_type('text/xml');
149: } else {
150: $r->content_type('text/html');
151: }
152: $r->send_http_header;
153: return OK;
154: }
155:
156: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
157: ['forceselect','launch']);
158:
159: my $requrl=$r->uri;
160: my $target = $ENV{'form.grade_target'};
161: # ----------------------------------------------------------------- Tie db file
162: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
163: my $fn=$ENV{'request.course.fn'};
164: if (-e "$fn.db") {
165: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
166: # ------------------------------------------------------------------- Hash tied
167: my $firstres=$hash{'map_start_'.$requrl};
168: my $lastres=$hash{'map_finish_'.$requrl};
169: if (($firstres) && ($lastres)) {
170: # ----------------------------------------------------------------- Render page
171:
172: @rows=();
173:
174: &tracetable(0,$firstres,'&'.$lastres.'&');
175: if ($hash{'src_'.$lastres}) {
176: my $brepriv=
177: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
178: if (($brepriv eq '2') || ($brepriv eq 'F')) {
179: $rows[$#rows+1]=''.$lastres;
180: }
181: }
182:
183: # ------------------------------------------------------------ Add to symb list
184:
185: my $i;
186: my %symbhash=();
187: for ($i=0;$i<=$#rows;$i++) {
188: if ($rows[$i]) {
189: my @colcont=split(/\&/,$rows[$i]);
190: foreach (@colcont) {
191: $symbhash{$hash{'src_'.$_}}='';
192: }
193: }
194: }
195: &Apache::lonnet::symblist($requrl,%symbhash);
196:
197: # ------------------------------------------------------------------ Page parms
198:
199: my $number_of_columns = 1;
200: my $j;
201: my $lcm=1;
202: my $contents=0;
203: my $nforms=0;
204:
205: my %ssibody=();
206: my %ssibgcolor=();
207: my %ssitext=();
208: my %ssilink=();
209: my %ssivlink=();
210: my %ssialink=();
211:
212: my %metalink=();
213:
214: my %cellemb=();
215:
216: my $allscript='';
217: my $allmeta='';
218:
219: my $isxml=0;
220: my $xmlheader='';
221: my $xmlbody='';
222:
223: # --------------------------------------------- Get SSI output, post parameters
224:
225: for ($i=0;$i<=$#rows;$i++) {
226: if ($rows[$i]) {
227: $contents++;
228: my @colcont=split(/\&/,$rows[$i]);
229: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
230: foreach (@colcont) {
231: my $src=$hash{'src_'.$_};
232: $src=~/\.(\w+)$/;
233: $metalink{$_}=$src.'.meta';
234: $cellemb{$_}=Apache::loncommon::fileembstyle($1);
235: if ($cellemb{$_} eq 'ssi') {
236: # --------------------------------------------------------- This is an SSI cell
237: my $prefix=$_.'_';
238: my %posthash=('request.prefix' => $prefix);
239: if (($ENV{'form.'.$prefix.'submit'})
240: || ($ENV{'form.all_submit'})) {
241: foreach (keys %ENV) {
242: if ($_=~/^form.$prefix/) {
243: my $name=$_;
244: $name=~s/^form.$prefix//;
245: $posthash{$name}=$ENV{$_};
246: }
247: }
248: }
249: my $output=Apache::lonnet::ssi($src,%posthash);
250: my $parser=HTML::TokeParser->new(\$output);
251: my $token;
252: my $thisdir=$src;
253: my $bodydef=0;
254: my $thisxml=0;
255: my @rlinks=();
256: if ($output=~/\?xml/) {
257: $isxml=1;
258: $thisxml=1;
259: $output=~
260: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
261: $xmlheader=$1;
262: }
263: while ($token=$parser->get_token) {
264: if ($token->[0] eq 'S') {
265: if ($token->[1] eq 'a') {
266: if ($token->[2]->{'href'}) {
267: $rlinks[$#rlinks+1]=
268: $token->[2]->{'href'};
269: }
270: } elsif ($token->[1] eq 'img') {
271: $rlinks[$#rlinks+1]=
272: $token->[2]->{'src'};
273: } elsif ($token->[1] eq 'embed') {
274: $rlinks[$#rlinks+1]=
275: $token->[2]->{'src'};
276: } elsif ($token->[1] eq 'base') {
277: $thisdir=$token->[2]->{'href'};
278: } elsif ($token->[1] eq 'body') {
279: $bodydef=1;
280: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
281: $ssitext{$_}=$token->[2]->{'text'};
282: $ssilink{$_}=$token->[2]->{'link'};
283: $ssivlink{$_}=$token->[2]->{'vlink'};
284: $ssialink{$_}=$token->[2]->{'alink'};
285: if ($thisxml) {
286: $xmlbody=$token->[4];
287: }
288: } elsif ($token->[1] eq 'meta') {
289: if ($token->[4] !~ m:/>$:) {
290: $allmeta.="\n".$token->[4].'</meta>';
291: } else {
292: $allmeta.="\n".$token->[4];
293: }
294: } elsif (($token->[1] eq 'script') &&
295: ($bodydef==0)) {
296: $allscript.="\n\n"
297: .$parser->get_text('/script');
298: }
299: }
300: }
301: if ($output=~/\<body[^\>]*\>(.*)/si) {
302: $output=$1;
303: }
304: $output=~s/\<\/body\>.*//si;
305: if ($output=~/\<form/si) {
306: $nforms++;
307: $output=~s/\<form[^\>]*\>//gsi;
308: $output=~s/\<\/form[^\>]*\>//gsi;
309: $output=~
310: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
311: }
312: $thisdir=~s/\/[^\/]*$//;
313: foreach (@rlinks) {
314: unless (($_=~/^http:\/\//i) ||
315: ($_=~/^\//) ||
316: ($_=~/^javascript:/i) ||
317: ($_=~/^mailto:/i) ||
318: ($_=~/^\#/)) {
319: my $newlocation=
320: &Apache::lonnet::hreflocation($thisdir,$_);
321: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
322: }
323: }
324: # -------------------------------------------------- Deal with Applet codebases
325: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
326: $ssibody{$_}=$output;
327: # ---------------------------------------------------------------- End SSI cell
328: }
329: }
330: }
331: }
332: unless ($contents) {
333: $r->content_type('text/html');
334: $r->send_http_header;
335: $r->print('<html><body>Empty page.</body></html>');
336: } else {
337: # ------------------------------------------------------------------ Build page
338:
339: # ---------------------------------------------------------------- Send headers
340: unless ($target eq 'tex') {
341: if ($isxml) {
342: $r->content_type('text/xml');
343: $r->send_http_header;
344: $r->print($xmlheader);
345: } else {
346: $r->content_type('text/html');
347: $r->send_http_header;
348: $r->print('<html>');
349: }
350: # ------------------------------------------------------------------------ Head
351: $r->print("\n<head>\n".$allmeta);
352: $allscript=~
353: s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
354: if ($allscript) {
355: $r->print("\n<script language='JavaScript'>\n".
356: $allscript."\n</script>\n");
357: }
358: $r->print(&Apache::lonxml::registerurl(1,undef));
359: $r->print("\n</head>\n");
360: # ------------------------------------------------------------------ Start body
361: if ($isxml) {
362: $r->print($xmlbody);
363: } else {
364: $r->print('<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonxml::loadevents.'" onUnload="'.&Apache::lonxml::unloadevents.'">');
365: }
366: # ------------------------------------------------------------------ Start form
367: if ($nforms) {
368: $r->print('<form method="post" action="'.
369: $requrl.'">');
370: }
371: } else {
372: $r->print('\documentclass[letterpaper]{article}
373: \newcommand{\keephidden}[1]{}
374: \usepackage[dvips]{graphicx}
375: \usepackage{epsfig}
376: \usepackage{calc}
377: \begin{document}');
378: }
379: # ----------------------------------------------------------------- Start table
380: if ($target eq 'tex') {
381: $r->print('\begin{tabular}INSERT');
382: } else {
383: $r->print('<table cols="'.$lcm.'" border="0">');
384: }
385: for ($i=0;$i<=$#rows;$i++) {
386: if ($rows[$i]) {
387: unless ($target eq 'tex') {
388: $r->print("\n<tr>");
389: }
390: my @colcont=split(/\&/,$rows[$i]);
391: my $avespan=$lcm/($#colcont+1);
392: for ($j=0;$j<=$#colcont;$j++) {
393: my $rid=$colcont[$j];
394: my $metainfo='<a href="'.
395: $metalink{$rid}.'" target="LONcatInfo">'.
396: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
397: '</img></a><a href="/adm/evaluate?postdata='.
398: &Apache::lonnet::escape(&Apache::lonnet::declutter($hash{'src_'.$rid}))
399: .'" target="LONcatInfo">'.
400: '<img src="/adm/lonMisc/eval_button.gif" border=0>'.
401: '</img></a>';
402: if (
403: ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
404: (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'}))) {
405: my ($mapid,$resid)=split(/\./,$rid);
406: my $symb=
407: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
408: '___'.$resid.'___'.
409: &Apache::lonnet::declutter($hash{'src_'.$rid});
410: $metainfo.=
411: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
412: '&command=submission" target="LONcatInfo">'.
413: '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
414: '</img></a>'.
415: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
416: '&command=gradingmenu" target="LONcatInfo">'.
417: '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
418: '</img></a>'.
419: '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
420: '" target="LONcatInfo">'.
421: '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
422: '</img></a>';
423: }
424: $metainfo.='<br></br>';
425: unless ($target eq 'tex') {
426: $r->print('<td colspan="'.$avespan.'"');
427: }
428: if ($cellemb{$rid} eq 'ssi') {
429: unless ($target eq 'tex') {
430: if ($ssibgcolor{$rid}) {
431: $r->print(' bgcolor="'.
432: $ssibgcolor{$rid}.'"');
433: }
434: $r->print('>'.$metainfo.'<font');
435:
436: if ($ssitext{$rid}) {
437: $r->print(' text="'.$ssitext{$rid}.'"');
438: }
439: if ($ssilink{$rid}) {
440: $r->print(' link="'.$ssilink{$rid}.'"');
441: }
442: if ($ssitext{$rid}) {
443: $r->print(' vlink="'.$ssivlink{$rid}.'"');
444: }
445: if ($ssialink{$rid}) {
446: $r->print(' alink="'.$ssialink{$rid}.'"');
447: }
448: $r->print('>');
449: }
450: $r->print($ssibody{$rid});
451: unless ($target eq 'tex') {
452: $r->print('</font>');
453: }
454: } elsif ($cellemb{$rid} eq 'img') {
455: $r->print('>'.$metainfo.'<img src="'.
456: $hash{'src_'.$rid}.'"></img>');
457: } elsif ($cellemb{$rid} eq 'emb') {
458: $r->print('>'.$metainfo.'<embed src="'.
459: $hash{'src_'.$rid}.'"></embed>');
460: }
461: unless ($target eq 'tex') {
462: $r->print('</td>');
463: } else {
464: $number_of_columns++;
465: $r->print(' & ');
466: }
467: }
468: unless ($target eq 'tex') {
469: $r->print('</tr>');
470: } else {
471: $number_of_columns = 1;
472: $r->print('REMOVE\\\\');
473: }
474: }
475: }
476: unless ($target eq 'tex') {
477: $r->print("\n</table>");
478: } else {
479: $r->print('\end{tabular}');
480: }
481: # ---------------------------------------------------------------- Submit, etc.
482: if ($nforms) {
483: $r->print(
484: '<input name="all_submit" value="Submit All" type="'.
485: (($nforms>1)?'submit':'hidden').'"></input></form>');
486: }
487: unless ($target eq 'tex') {
488: $r->print('</body>'.&Apache::lonxml::xmlend());
489: } else {
490: $r->print('\end{document}'.$number_of_columns);
491: }
492: # -------------------------------------------------------------------- End page
493: }
494: # ------------------------------------------------------------- End render page
495: } else {
496: $r->content_type('text/html');
497: $r->send_http_header;
498: &Apache::lonsequence::viewmap($r,$requrl);
499: }
500: # ------------------------------------------------------------------ Untie hash
501: unless (untie(%hash)) {
502: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
503: "Could not untie coursemap $fn (browse).</font>");
504: }
505: # -------------------------------------------------------------------- All done
506: return OK;
507: # ----------------------------------------------- Errors, hash could no be tied
508: }
509: }
510: }
511: $r->content_type('text/html');
512: $r->send_http_header;
513: &Apache::lonsequence::viewmap($r,$requrl);
514: return OK;
515: }
516:
517: 1;
518: __END__
519:
520: =head1 NAME
521:
522: Apache::lonpage - Page Handler
523:
524: =head1 SYNOPSIS
525:
526: Invoked by /etc/httpd/conf/srm.conf:
527:
528: <LocationMatch "^/res/.*\.page$>
529: SetHandler perl-script
530: PerlHandler Apache::lonpage
531: </LocationMatch>
532:
533: =head1 INTRODUCTION
534:
535: This module renders a .page resource.
536:
537: This is part of the LearningOnline Network with CAPA project
538: described at http://www.lon-capa.org.
539:
540: =head1 HANDLER SUBROUTINE
541:
542: This routine is called by Apache and mod_perl.
543:
544: =over 4
545:
546: =item *
547:
548: set document type for header only
549:
550: =item *
551:
552: tie db file
553:
554: =item *
555:
556: render page
557:
558: =item *
559:
560: add to symb list
561:
562: =item *
563:
564: page parms
565:
566: =item *
567:
568: Get SSI output, post parameters
569:
570: =item *
571:
572: SSI cell rendering
573:
574: =item *
575:
576: Deal with Applet codebases
577:
578: =item *
579:
580: Build page
581:
582: =item *
583:
584: send headers
585:
586: =item *
587:
588: start body
589:
590: =item *
591:
592: start form
593:
594: =item *
595:
596: start table
597:
598: =item *
599:
600: submit element, etc, render page, untie hash
601:
602: =back
603:
604: =head1 OTHER SUBROUTINES
605:
606: =over 4
607:
608: =item *
609:
610: euclid() : Euclid's method for determining the greatest common denominator.
611:
612: =item *
613:
614: tracetable() : Build page table.
615:
616: =back
617:
618: =cut
619:
620:
621:
622:
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