Annotation of rat/lonsequence.pm, revision 1.14

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Sequence Handler
                      4: #
1.14    ! www         5: # $Id: lonsequence.pm,v 1.13 2002/08/12 18:21:42 albertel 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;
1.1       www        49: 
1.12      www        50: my %selhash;
                     51: my $successtied;
1.8       www        52: 
                     53: # ----------------------------------------- Attempt to read from resource space
                     54: 
                     55: sub attemptread {
                     56:     my $fn=shift;
                     57:     &Apache::lonnet::repcopy($fn);
                     58:     if (-e $fn) {
                     59: 	return &Apache::lonratedt::attemptread($fn);
                     60:     } else {
                     61:         return ();
                     62:     }
                     63: }
                     64: 
                     65: # ---------------------------------------------------------------- View Handler
                     66: 
                     67: sub viewmap {
1.9       www        68:     my ($r,$url)=@_;
1.8       www        69:     $r->print('<html>');
                     70:     if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
                     71: <script>
                     72: 
                     73: function select_group() {
1.12      www        74:     window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
1.8       www        75: }
                     76: 
                     77: function queue(val) {
                     78:     if (eval("document.forms."+val+".filelink.checked")) {
                     79: 	var l=val.length;
                     80: 	var v=val.substring(4,l);
                     81: 	document.forms.fileattr.acts.value+='1a'+v+'b';
                     82:     }
                     83:     else {
                     84: 	var l=val.length;
                     85: 	var v=val.substring(4,l);
                     86: 	document.forms.fileattr.acts.value+='0a'+v+'b';
                     87:     }
                     88: }
                     89: 
                     90: </script>
                     91: ENDSCRIPT
                     92:     }
1.14    ! www        93:     $r->print(&Apache::loncommon::bodytag('Map Contents').'<h1>'.$url.'</h1>');
1.12      www        94: # ------------------ This is trying to select. Provide buttons and tie %selhash
1.8       www        95:     if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
                     96: <form name=fileattr><input type=hidden name=acts value=''>
                     97: <input type="button" name="close" value='CLOSE' onClick="self.close()">
                     98: <input type="button" name="groupimport" value='GROUP IMPORT'
                     99: onClick="javascript:select_group()">
                    100: </form>   
                    101: ENDSELECT
1.12      www       102:     my $diropendb = 
                    103:     "/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db";
1.13      albertel  104:         if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
1.12      www       105: 	    if ($ENV{'form.launch'} eq '1') {
                    106: 	       &start_fresh_session();
                    107: 	    }
                    108:             $successtied=1;
                    109: 
                    110: # - Evaluate actions from previous page (both cumulatively and chronologically)
                    111:         if ($ENV{'form.catalogmode'} eq 'groupimport') {
                    112: 	    my $acts=$ENV{'form.acts'};
                    113: 	    my @Acts=split(/b/,$acts);
                    114: 	    my %ahash;
                    115: 	    my %achash;
                    116: 	    my $ac=0;
                    117: 	    # some initial hashes for working with data
                    118: 	    foreach (@Acts) {
                    119: 		my ($state,$ref)=split(/a/);
                    120: 		$ahash{$ref}=$state;
                    121: 		$achash{$ref}=$ac;
                    122: 		$ac++;
                    123: 	    }
                    124: 	    # sorting through the actions and changing the tied database hash
                    125: 	    foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
                    126: 		my $key=$_;
                    127: 		if ($ahash{$key} eq '1') {
                    128: 		    $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
                    129: 			$selhash{'pre_'.$key.'_title'};
                    130: 		    $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
                    131: 			$selhash{'storectr'}+0;
                    132: 		    $selhash{'storectr'}++;
                    133: 		}
                    134: 		if ($ahash{$key} eq '0') {
                    135: 		    if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
                    136: 		       delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
                    137: 		    }
                    138: 		}
                    139: 	    }
                    140: 	    # deleting the previously cached listing
                    141: 	    foreach (keys %selhash) {
                    142: 		if ($_ =~ /^pre_/ && $_ =~/link$/) {
                    143: 		    my $key = $_;
                    144: 		    $key =~ s/^pre_//;
                    145: 		    $key =~ s/_[^_]*$//;
                    146: 		    delete $selhash{'pre_'.$key.'_title'};
                    147: 		    delete $selhash{'pre_'.$key.'_link'};
                    148: 		}
                    149: 	    }
                    150: 	}
                    151: # -
                    152:         }
1.8       www       153:     }
1.12      www       154: # ----------------------------- successtied is now '1' if in working selectmode
1.8       www       155:     my $idx=0;
                    156:     foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
                    157: 	if (defined($_)) {
                    158:             $idx++;
1.12      www       159:             if ($successtied) { 
1.8       www       160: 		$r->print('<form name="form'.$idx.'">');
                    161:             }
                    162: 	    my ($title,$url)=split(/\:/,$_);
                    163:             $title=~s/\&colon\;/\:/g;
                    164:             $url=~s/\&colon\;/\:/g;
                    165:             unless ($title) { $title=(split(/\//,$url))[-1] };
                    166:             unless ($title) { $title='<i>Empty</i>'; }
                    167:             if ($url) {
1.12      www       168: 		if ($successtied) {
                    169: 		    my $checked='';
                    170: 	           if ($selhash{'store_'.$url}) {
                    171: 	       	      $checked=" checked";
                    172: 	           }
                    173: 	           $selhash{"pre_${idx}_link"}=$url;
                    174: 	           $selhash{"pre_${idx}_title"}=$title;
                    175: 
1.8       www       176: 		    $r->print(<<ENDCHECKBOX);
                    177: <input type='checkbox' name='filelink' 
1.12      www       178: value='$url' onClick='javascript:queue("form$idx")'$checked>
1.8       www       179: <input type='hidden' name='title' value='$title'>
                    180: ENDCHECKBOX
                    181:                 }
                    182: 		$r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
                    183:             }
                    184:             $r->print(&Apache::lonratsrv::qtescape($title));
                    185:             if ($url) { $r->print('</a>'); }
1.12      www       186:             if ($successtied) {
1.8       www       187: 		$r->print('</form>');
                    188:             } else {
                    189: 		$r->print('<br>');
                    190:             }
                    191:         }
                    192:     }
                    193:     $r->print('</body></html>');
1.12      www       194:     if ($successtied) {
                    195: 	untie %selhash;
                    196:     }
1.8       www       197: }
                    198: 
1.12      www       199: # ----------------------------------------------------------- Clean out selhash
                    200: sub start_fresh_session {
                    201:     foreach (keys %selhash) {
                    202: 	if ($_ =~ /^pre_/) {
                    203: 	    delete $selhash{$_};
                    204: 	}
                    205: 	if ($_ =~ /^store/) {
                    206: 	    delete $selhash{$_};
                    207: 	}
                    208:     }
                    209: }
                    210: 
                    211: 
1.1       www       212: # ================================================================ Main Handler
                    213: 
                    214: sub handler {
                    215:    my $r=shift;
                    216: 
                    217:    if ($r->header_only) {
                    218:       $r->content_type('text/html');
                    219:       $r->send_http_header;
                    220:       return OK;
                    221:    }
1.8       www       222:  
                    223:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.12      www       224:                                           ['forceselect','launch']);
1.1       www       225: 
1.2       www       226:    my %hash;
1.1       www       227:    my %bighash;
1.2       www       228:    my $requrl=$r->uri;
                    229: 
1.12      www       230:    $successtied=0;
1.3       www       231: # ------------------------------------------------------------ Tie symb db file
1.9       www       232:   my $disurl='';
                    233:   my $dismapid='';
                    234: 
                    235:   if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
1.2       www       236:        my $last;
                    237:        if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1.13      albertel  238:                     &GDBM_READER(),0640)) {
1.2       www       239: 	   $last=$hash{'last_direction'};
                    240:            untie(%hash);
                    241:        }
1.3       www       242:        my $direction='';
                    243:        my $prevmap='';
                    244:        if ($last) {
                    245: 	  ($prevmap,$direction)=(split(/\_\_\_/,$last));
                    246:        }
                    247: # ------------------------------------------------------------- Tie big db file
1.1       www       248:        if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.13      albertel  249:                     &GDBM_READER(),0640)) {
1.3       www       250: 	   my $disid='';
1.10      www       251: 
1.3       www       252:            if ($direction eq 'back') {
                    253: 	       $disid=$bighash{'map_finish_'.$requrl};
                    254:            } else {
                    255:                $disid=$bighash{'map_start_'.$requrl};
                    256:            } 
                    257:            if ($disid) {
                    258: 	       $disurl=$bighash{'src_'.$disid};
1.4       www       259:                $dismapid=(split(/\./,$disid))[1];
1.3       www       260:            }
1.11      www       261: # ------------------------- If this is an empty one, skip to next non-empty one
                    262:            if ((!$disurl) && ($disid)) {
                    263: 	       $direction=($direction?$direction:'forward');
                    264:                ($disid,$requrl)=
                    265:                          &Apache::lonpageflip::fullmove($disid,
                    266:                            &Apache::lonnet::declutter($requrl),$direction);
                    267:                if ($disid) {
                    268: 	           $disurl=$bighash{'src_'.$disid};
                    269:                    $dismapid=(split(/\./,$disid))[1];
                    270:                }
                    271:  	   }
                    272: 
1.3       www       273: # --------------------------------------- Untie hash, make sure to come by here
                    274:            untie(%bighash);
1.9       www       275:        }
                    276:    }
                    277: 
                    278: # now either disurl is set (going to first page), or we need another display
                    279: 
                    280:    if ($disurl) {
1.3       www       281: # -------------------------------------------------- Has first or last resource
1.9       www       282:       &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
1.7       www       283:                    'last_known' => &Apache::lonnet::declutter($disurl)); 
1.9       www       284:       $r->content_type('text/html');
                    285:       $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
                    286:       return REDIRECT;
1.1       www       287:    } else {
1.9       www       288:        $r->content_type('text/html');
                    289:        $r->send_http_header;
                    290:        &viewmap($r,$requrl);
                    291:        return OK;
1.1       www       292:    }
                    293: }
                    294: 
                    295: 1;
                    296: __END__
                    297: 
                    298: 
                    299: 
                    300: 
                    301: 
                    302: 
                    303: 

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>