Annotation of rat/lonsequence.pm, revision 1.12

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Sequence Handler
                      4: #
1.12    ! www         5: # $Id: lonsequence.pm,v 1.11 2002/05/23 15:07:55 www 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;
1.1       www        48: 
1.12    ! www        49: my %selhash;
        !            50: my $successtied;
1.8       www        51: 
                     52: # ----------------------------------------- Attempt to read from resource space
                     53: 
                     54: sub attemptread {
                     55:     my $fn=shift;
                     56:     &Apache::lonnet::repcopy($fn);
                     57:     if (-e $fn) {
                     58: 	return &Apache::lonratedt::attemptread($fn);
                     59:     } else {
                     60:         return ();
                     61:     }
                     62: }
                     63: 
                     64: # ---------------------------------------------------------------- View Handler
                     65: 
                     66: sub viewmap {
1.9       www        67:     my ($r,$url)=@_;
1.8       www        68:     $r->print('<html>');
                     69:     if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
                     70: <script>
                     71: 
                     72: function select_group() {
1.12    ! www        73:     window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
1.8       www        74: }
                     75: 
                     76: function queue(val) {
                     77:     if (eval("document.forms."+val+".filelink.checked")) {
                     78: 	var l=val.length;
                     79: 	var v=val.substring(4,l);
                     80: 	document.forms.fileattr.acts.value+='1a'+v+'b';
                     81:     }
                     82:     else {
                     83: 	var l=val.length;
                     84: 	var v=val.substring(4,l);
                     85: 	document.forms.fileattr.acts.value+='0a'+v+'b';
                     86:     }
                     87: }
                     88: 
                     89: </script>
                     90: ENDSCRIPT
                     91:     }
1.9       www        92:     $r->print('<body bgcolor="#FFFFFF">');
1.12    ! www        93: # ------------------ This is trying to select. Provide buttons and tie %selhash
1.8       www        94:     if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
                     95: <form name=fileattr><input type=hidden name=acts value=''>
                     96: <input type="button" name="close" value='CLOSE' onClick="self.close()">
                     97: <input type="button" name="groupimport" value='GROUP IMPORT'
                     98: onClick="javascript:select_group()">
                     99: </form>   
                    100: ENDSELECT
1.12    ! www       101:     my $diropendb = 
        !           102:     "/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db";
        !           103:         if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) {
        !           104: 	    if ($ENV{'form.launch'} eq '1') {
        !           105: 	       &start_fresh_session();
        !           106: 	    }
        !           107:             $successtied=1;
        !           108: 
        !           109: # - Evaluate actions from previous page (both cumulatively and chronologically)
        !           110:         if ($ENV{'form.catalogmode'} eq 'groupimport') {
        !           111: 	    my $acts=$ENV{'form.acts'};
        !           112: 	    my @Acts=split(/b/,$acts);
        !           113: 	    my %ahash;
        !           114: 	    my %achash;
        !           115: 	    my $ac=0;
        !           116: 	    # some initial hashes for working with data
        !           117: 	    foreach (@Acts) {
        !           118: 		my ($state,$ref)=split(/a/);
        !           119: 		$ahash{$ref}=$state;
        !           120: 		$achash{$ref}=$ac;
        !           121: 		$ac++;
        !           122: 	    }
        !           123: 	    # sorting through the actions and changing the tied database hash
        !           124: 	    foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
        !           125: 		my $key=$_;
        !           126: 		if ($ahash{$key} eq '1') {
        !           127: 		    $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
        !           128: 			$selhash{'pre_'.$key.'_title'};
        !           129: 		    $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
        !           130: 			$selhash{'storectr'}+0;
        !           131: 		    $selhash{'storectr'}++;
        !           132: 		}
        !           133: 		if ($ahash{$key} eq '0') {
        !           134: 		    if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
        !           135: 		       delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
        !           136: 		    }
        !           137: 		}
        !           138: 	    }
        !           139: 	    # deleting the previously cached listing
        !           140: 	    foreach (keys %selhash) {
        !           141: 		if ($_ =~ /^pre_/ && $_ =~/link$/) {
        !           142: 		    my $key = $_;
        !           143: 		    $key =~ s/^pre_//;
        !           144: 		    $key =~ s/_[^_]*$//;
        !           145: 		    delete $selhash{'pre_'.$key.'_title'};
        !           146: 		    delete $selhash{'pre_'.$key.'_link'};
        !           147: 		}
        !           148: 	    }
        !           149: 	}
        !           150: # -
        !           151:         }
1.8       www       152:     }
1.12    ! www       153: # ----------------------------- successtied is now '1' if in working selectmode
1.8       www       154:     my $idx=0;
                    155:     foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
                    156: 	if (defined($_)) {
                    157:             $idx++;
1.12    ! www       158:             if ($successtied) { 
1.8       www       159: 		$r->print('<form name="form'.$idx.'">');
                    160:             }
                    161: 	    my ($title,$url)=split(/\:/,$_);
                    162:             $title=~s/\&colon\;/\:/g;
                    163:             $url=~s/\&colon\;/\:/g;
                    164:             unless ($title) { $title=(split(/\//,$url))[-1] };
                    165:             unless ($title) { $title='<i>Empty</i>'; }
                    166:             if ($url) {
1.12    ! www       167: 		if ($successtied) {
        !           168: 		    my $checked='';
        !           169: 	           if ($selhash{'store_'.$url}) {
        !           170: 	       	      $checked=" checked";
        !           171: 	           }
        !           172: 	           $selhash{"pre_${idx}_link"}=$url;
        !           173: 	           $selhash{"pre_${idx}_title"}=$title;
        !           174: 
1.8       www       175: 		    $r->print(<<ENDCHECKBOX);
                    176: <input type='checkbox' name='filelink' 
1.12    ! www       177: value='$url' onClick='javascript:queue("form$idx")'$checked>
1.8       www       178: <input type='hidden' name='title' value='$title'>
                    179: ENDCHECKBOX
                    180:                 }
                    181: 		$r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
                    182:             }
                    183:             $r->print(&Apache::lonratsrv::qtescape($title));
                    184:             if ($url) { $r->print('</a>'); }
1.12    ! www       185:             if ($successtied) {
1.8       www       186: 		$r->print('</form>');
                    187:             } else {
                    188: 		$r->print('<br>');
                    189:             }
                    190:         }
                    191:     }
                    192:     $r->print('</body></html>');
1.12    ! www       193:     if ($successtied) {
        !           194: 	untie %selhash;
        !           195:     }
1.8       www       196: }
                    197: 
1.12    ! www       198: # ----------------------------------------------------------- Clean out selhash
        !           199: sub start_fresh_session {
        !           200:     foreach (keys %selhash) {
        !           201: 	if ($_ =~ /^pre_/) {
        !           202: 	    delete $selhash{$_};
        !           203: 	}
        !           204: 	if ($_ =~ /^store/) {
        !           205: 	    delete $selhash{$_};
        !           206: 	}
        !           207:     }
        !           208: }
        !           209: 
        !           210: 
1.1       www       211: # ================================================================ Main Handler
                    212: 
                    213: sub handler {
                    214:    my $r=shift;
                    215: 
                    216:    if ($r->header_only) {
                    217:       $r->content_type('text/html');
                    218:       $r->send_http_header;
                    219:       return OK;
                    220:    }
1.8       www       221:  
                    222:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.12    ! www       223:                                           ['forceselect','launch']);
1.1       www       224: 
1.2       www       225:    my %hash;
1.1       www       226:    my %bighash;
1.2       www       227:    my $requrl=$r->uri;
                    228: 
1.12    ! www       229:    $successtied=0;
1.3       www       230: # ------------------------------------------------------------ Tie symb db file
1.9       www       231:   my $disurl='';
                    232:   my $dismapid='';
                    233: 
                    234:   if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
1.2       www       235:        my $last;
                    236:        if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
                    237:                     &GDBM_READER,0640)) {
                    238: 	   $last=$hash{'last_direction'};
                    239:            untie(%hash);
                    240:        }
1.3       www       241:        my $direction='';
                    242:        my $prevmap='';
                    243:        if ($last) {
                    244: 	  ($prevmap,$direction)=(split(/\_\_\_/,$last));
                    245:        }
                    246: # ------------------------------------------------------------- Tie big db file
1.1       www       247:        if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                    248:                     &GDBM_READER,0640)) {
1.3       www       249: 	   my $disid='';
1.10      www       250: 
1.3       www       251:            if ($direction eq 'back') {
                    252: 	       $disid=$bighash{'map_finish_'.$requrl};
                    253:            } else {
                    254:                $disid=$bighash{'map_start_'.$requrl};
                    255:            } 
                    256:            if ($disid) {
                    257: 	       $disurl=$bighash{'src_'.$disid};
1.4       www       258:                $dismapid=(split(/\./,$disid))[1];
1.3       www       259:            }
1.11      www       260: # ------------------------- If this is an empty one, skip to next non-empty one
                    261:            if ((!$disurl) && ($disid)) {
                    262: 	       $direction=($direction?$direction:'forward');
                    263:                ($disid,$requrl)=
                    264:                          &Apache::lonpageflip::fullmove($disid,
                    265:                            &Apache::lonnet::declutter($requrl),$direction);
                    266:                if ($disid) {
                    267: 	           $disurl=$bighash{'src_'.$disid};
                    268:                    $dismapid=(split(/\./,$disid))[1];
                    269:                }
                    270:  	   }
                    271: 
1.3       www       272: # --------------------------------------- Untie hash, make sure to come by here
                    273:            untie(%bighash);
1.9       www       274:        }
                    275:    }
                    276: 
                    277: # now either disurl is set (going to first page), or we need another display
                    278: 
                    279:    if ($disurl) {
1.3       www       280: # -------------------------------------------------- Has first or last resource
1.9       www       281:       &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
1.7       www       282:                    'last_known' => &Apache::lonnet::declutter($disurl)); 
1.9       www       283:       $r->content_type('text/html');
                    284:       $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
                    285:       return REDIRECT;
1.1       www       286:    } else {
1.9       www       287:        $r->content_type('text/html');
                    288:        $r->send_http_header;
                    289:        &viewmap($r,$requrl);
                    290:        return OK;
1.1       www       291:    }
                    292: }
                    293: 
                    294: 1;
                    295: __END__
                    296: 
                    297: 
                    298: 
                    299: 
                    300: 
                    301: 
                    302: 

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