Annotation of rat/lonsequence.pm, revision 1.18

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Sequence Handler
                      4: #
1.18    ! raeburn     5: # $Id: lonsequence.pm,v 1.17 2004/05/21 20:16:40 raeburn Exp $
1.5       www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA 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: # LON-CAPA 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 LON-CAPA; if not, write to the Free Software
                     23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
                     27: # http://www.lon-capa.org/
                     28: #
1.1       www        29: # (Handler to resolve ambiguous file locations
                     30: #
                     31: # (TeX Content Handler
                     32: #
                     33: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
                     34: #
                     35: # 10/11,10/12 Gerd Kortemeyer)
                     36: #
                     37: # 10/16 Gerd Kortemeyer
                     38: 
1.3       www        39: package Apache::lonsequence;
1.1       www        40: 
                     41: use strict;
                     42: use Apache::lonnet;
1.3       www        43: use Apache::Constants qw(:common :http REDIRECT);
1.1       www        44: use GDBM_File;
1.8       www        45: use Apache::lonratedt;
                     46: use Apache::lonratsrv;
1.11      www        47: use Apache::lonpageflip;
1.14      www        48: use Apache::loncommon;
1.16      www        49: use Apache::lonlocal;
1.1       www        50: 
1.12      www        51: my %selhash;
                     52: my $successtied;
1.8       www        53: 
                     54: # ----------------------------------------- Attempt to read from resource space
                     55: 
                     56: sub attemptread {
                     57:     my $fn=shift;
                     58:     &Apache::lonnet::repcopy($fn);
                     59:     if (-e $fn) {
                     60: 	return &Apache::lonratedt::attemptread($fn);
                     61:     } else {
                     62:         return ();
                     63:     }
                     64: }
                     65: 
1.15      www        66: sub mapread {
                     67:     my $fn=shift;
                     68:     &Apache::lonnet::repcopy($fn);
                     69:     if (-e $fn) {
                     70: 	return &Apache::lonratedt::mapread($fn,'');
                     71:     } else {
                     72:         return ();
                     73:     }
                     74: }
                     75: 
1.8       www        76: # ---------------------------------------------------------------- View Handler
                     77: 
                     78: sub viewmap {
1.9       www        79:     my ($r,$url)=@_;
1.8       www        80:     $r->print('<html>');
                     81:     if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
                     82: <script>
                     83: 
                     84: function select_group() {
1.12      www        85:     window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
1.8       www        86: }
                     87: 
                     88: function queue(val) {
                     89:     if (eval("document.forms."+val+".filelink.checked")) {
                     90: 	var l=val.length;
                     91: 	var v=val.substring(4,l);
                     92: 	document.forms.fileattr.acts.value+='1a'+v+'b';
                     93:     }
                     94:     else {
                     95: 	var l=val.length;
                     96: 	var v=val.substring(4,l);
                     97: 	document.forms.fileattr.acts.value+='0a'+v+'b';
                     98:     }
                     99: }
                    100: 
                    101: </script>
                    102: ENDSCRIPT
                    103:     }
1.14      www       104:     $r->print(&Apache::loncommon::bodytag('Map Contents').'<h1>'.$url.'</h1>');
1.12      www       105: # ------------------ This is trying to select. Provide buttons and tie %selhash
1.8       www       106:     if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
                    107: <form name=fileattr><input type=hidden name=acts value=''>
                    108: <input type="button" name="close" value='CLOSE' onClick="self.close()">
                    109: <input type="button" name="groupimport" value='GROUP IMPORT'
                    110: onClick="javascript:select_group()">
                    111: </form>   
                    112: ENDSELECT
1.12      www       113:     my $diropendb = 
                    114:     "/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db";
1.13      albertel  115:         if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
1.12      www       116: 	    if ($ENV{'form.launch'} eq '1') {
                    117: 	       &start_fresh_session();
                    118: 	    }
                    119:             $successtied=1;
                    120: 
                    121: # - Evaluate actions from previous page (both cumulatively and chronologically)
                    122:         if ($ENV{'form.catalogmode'} eq 'groupimport') {
                    123: 	    my $acts=$ENV{'form.acts'};
                    124: 	    my @Acts=split(/b/,$acts);
                    125: 	    my %ahash;
                    126: 	    my %achash;
                    127: 	    my $ac=0;
                    128: 	    # some initial hashes for working with data
                    129: 	    foreach (@Acts) {
                    130: 		my ($state,$ref)=split(/a/);
                    131: 		$ahash{$ref}=$state;
                    132: 		$achash{$ref}=$ac;
                    133: 		$ac++;
                    134: 	    }
                    135: 	    # sorting through the actions and changing the tied database hash
                    136: 	    foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
                    137: 		my $key=$_;
                    138: 		if ($ahash{$key} eq '1') {
                    139: 		    $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
                    140: 			$selhash{'pre_'.$key.'_title'};
                    141: 		    $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
                    142: 			$selhash{'storectr'}+0;
                    143: 		    $selhash{'storectr'}++;
                    144: 		}
                    145: 		if ($ahash{$key} eq '0') {
                    146: 		    if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
                    147: 		       delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
                    148: 		    }
                    149: 		}
                    150: 	    }
                    151: 	    # deleting the previously cached listing
                    152: 	    foreach (keys %selhash) {
                    153: 		if ($_ =~ /^pre_/ && $_ =~/link$/) {
                    154: 		    my $key = $_;
                    155: 		    $key =~ s/^pre_//;
                    156: 		    $key =~ s/_[^_]*$//;
                    157: 		    delete $selhash{'pre_'.$key.'_title'};
                    158: 		    delete $selhash{'pre_'.$key.'_link'};
                    159: 		}
                    160: 	    }
                    161: 	}
                    162: # -
                    163:         }
1.8       www       164:     }
1.12      www       165: # ----------------------------- successtied is now '1' if in working selectmode
1.15      www       166:     my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
                    167:     if ($fatal==1) {
1.16      www       168:        $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
1.15      www       169:     }
1.8       www       170:     my $idx=0;
                    171:     foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
                    172: 	if (defined($_)) {
                    173:             $idx++;
1.12      www       174:             if ($successtied) { 
1.8       www       175: 		$r->print('<form name="form'.$idx.'">');
                    176:             }
                    177: 	    my ($title,$url)=split(/\:/,$_);
                    178:             $title=~s/\&colon\;/\:/g;
                    179:             $url=~s/\&colon\;/\:/g;
                    180:             unless ($title) { $title=(split(/\//,$url))[-1] };
1.16      www       181:             unless ($title) { $title='<i>'.&mt('Empty').'</i>'; }
1.8       www       182:             if ($url) {
1.12      www       183: 		if ($successtied) {
                    184: 		    my $checked='';
                    185: 	           if ($selhash{'store_'.$url}) {
                    186: 	       	      $checked=" checked";
                    187: 	           }
                    188: 	           $selhash{"pre_${idx}_link"}=$url;
                    189: 	           $selhash{"pre_${idx}_title"}=$title;
                    190: 
1.8       www       191: 		    $r->print(<<ENDCHECKBOX);
                    192: <input type='checkbox' name='filelink' 
1.12      www       193: value='$url' onClick='javascript:queue("form$idx")'$checked>
1.8       www       194: <input type='hidden' name='title' value='$title'>
                    195: ENDCHECKBOX
                    196:                 }
                    197: 		$r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
                    198:             }
                    199:             $r->print(&Apache::lonratsrv::qtescape($title));
                    200:             if ($url) { $r->print('</a>'); }
1.12      www       201:             if ($successtied) {
1.8       www       202: 		$r->print('</form>');
                    203:             } else {
                    204: 		$r->print('<br>');
                    205:             }
                    206:         }
                    207:     }
                    208:     $r->print('</body></html>');
1.12      www       209:     if ($successtied) {
                    210: 	untie %selhash;
                    211:     }
1.8       www       212: }
                    213: 
1.12      www       214: # ----------------------------------------------------------- Clean out selhash
                    215: sub start_fresh_session {
                    216:     foreach (keys %selhash) {
                    217: 	if ($_ =~ /^pre_/) {
                    218: 	    delete $selhash{$_};
                    219: 	}
                    220: 	if ($_ =~ /^store/) {
                    221: 	    delete $selhash{$_};
                    222: 	}
                    223:     }
                    224: }
                    225: 
                    226: 
1.1       www       227: # ================================================================ Main Handler
                    228: 
                    229: sub handler {
                    230:    my $r=shift;
                    231: 
                    232:    if ($r->header_only) {
1.16      www       233:       &Apache::loncommon::content_type($r,'text/html');
1.1       www       234:       $r->send_http_header;
                    235:       return OK;
                    236:    }
1.8       www       237:  
                    238:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.12      www       239:                                           ['forceselect','launch']);
1.1       www       240: 
1.2       www       241:    my %hash;
1.1       www       242:    my %bighash;
1.2       www       243:    my $requrl=$r->uri;
                    244: 
1.12      www       245:    $successtied=0;
1.3       www       246: # ------------------------------------------------------------ Tie symb db file
1.9       www       247:   my $disurl='';
                    248:   my $dismapid='';
1.18    ! raeburn   249:   my $exitdisid = '';
        !           250:   my $arrow_dir = '';
1.9       www       251: 
                    252:   if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
1.2       www       253:        my $last;
                    254:        if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1.13      albertel  255:                     &GDBM_READER(),0640)) {
1.2       www       256: 	   $last=$hash{'last_direction'};
                    257:            untie(%hash);
                    258:        }
1.3       www       259:        my $direction='';
                    260:        my $prevmap='';
                    261:        if ($last) {
                    262: 	  ($prevmap,$direction)=(split(/\_\_\_/,$last));
                    263:        }
                    264: # ------------------------------------------------------------- Tie big db file
1.1       www       265:        if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.13      albertel  266:                     &GDBM_READER(),0640)) {
1.3       www       267: 	   my $disid='';
1.17      raeburn   268:            my $randomout ='';
1.10      www       269: 
1.3       www       270:            if ($direction eq 'back') {
                    271: 	       $disid=$bighash{'map_finish_'.$requrl};
                    272:            } else {
                    273:                $disid=$bighash{'map_start_'.$requrl};
1.18    ! raeburn   274:            }
1.3       www       275:            if ($disid) {
                    276: 	       $disurl=$bighash{'src_'.$disid};
1.4       www       277:                $dismapid=(split(/\./,$disid))[1];
1.17      raeburn   278:                $randomout = $bighash{'randomout_'.$disid};
1.18    ! raeburn   279:            } elsif (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
        !           280:                     &GDBM_READER(),0640)) {
        !           281:                $last=$hash{'last_known'};
        !           282:                untie(%hash);
1.3       www       283:            }
1.18    ! raeburn   284: 
        !           285: 
1.17      raeburn   286: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
1.18    ! raeburn   287:            while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
1.11      www       288: 	       $direction=($direction?$direction:'forward');
                    289:                ($disid,$requrl)=
                    290:                          &Apache::lonpageflip::fullmove($disid,
                    291:                            &Apache::lonnet::declutter($requrl),$direction);
                    292:                if ($disid) {
                    293: 	           $disurl=$bighash{'src_'.$disid};
                    294:                    $dismapid=(split(/\./,$disid))[1];
                    295:                }
                    296:  	   }
1.18    ! raeburn   297:            $exitdisid = $disid;
        !           298:            $arrow_dir = $direction;
1.11      www       299: 
1.3       www       300: # --------------------------------------- Untie hash, make sure to come by here
                    301:            untie(%bighash);
1.9       www       302:        }
                    303:    }
                    304: 
                    305: # now either disurl is set (going to first page), or we need another display
                    306:    if ($disurl) {
1.3       www       307: # -------------------------------------------------- Has first or last resource
1.9       www       308:       &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
1.7       www       309:                    'last_known' => &Apache::lonnet::declutter($disurl)); 
1.16      www       310:       &Apache::loncommon::content_type($r,'text/html');
1.9       www       311:       $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
                    312:       return REDIRECT;
1.1       www       313:    } else {
1.16      www       314:        &Apache::loncommon::content_type($r,'text/html');
1.9       www       315:        $r->send_http_header;
1.18    ! raeburn   316:        if ($exitdisid eq '') {
        !           317:            my %lt =&Apache::lonlocal::texthash(
        !           318:                    'back' => 'beginning',
        !           319:                    'forward' => 'end',
        !           320:                    'emfo' => 'Empty Folder/Sequence',
        !           321:                    'nere' => 'Next resource could not be displayed',
        !           322:                    'goba' => 'Go Back',
        !           323:                    'nacc' => 'Navigate Course Content',
        !           324:                           );
        !           325:            my $warnmsg = 'As all folders and sequences ';
        !           326:            if ($arrow_dir eq 'forward') {
        !           327:                $warnmsg .= &mt('following the current resource were empty').',';
        !           328:            } elsif ($arrow_dir eq 'back') {
        !           329:                $warnmsg .= &mt('preceding the current resource were empty').',';
        !           330:            }
        !           331:            $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
        !           332:            my $bodytag=&Apache::loncommon::bodytag(&mt('emfo'));
        !           333:            $r->print(<<ENDNONE);
        !           334: <head><title>$lt{'emfo'}</title></head>
        !           335: $bodytag
        !           336: <h3>$lt{'nere'}</h3>
        !           337: <p>$warnmsg</p>
        !           338: <ul>
        !           339:   <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
        !           340:   <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
        !           341: </ul>
        !           342: </body>
        !           343:  </html>
        !           344: ENDNONE
        !           345:        } else {
        !           346:            &viewmap($r,$requrl);
        !           347:        }
1.9       www       348:        return OK;
1.1       www       349:    }
                    350: }
                    351: 
                    352: 1;
                    353: __END__
                    354: 
                    355: 
                    356: 
                    357: 
                    358: 
                    359: 
                    360: 

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