--- rat/lonsequence.pm 2001/11/29 19:23:49 1.5 +++ rat/lonsequence.pm 2006/04/04 15:32:12 1.26 @@ -2,7 +2,7 @@ # # Sequence Handler # -# $Id: lonsequence.pm,v 1.5 2001/11/29 19:23:49 www Exp $ +# $Id: lonsequence.pm,v 1.26 2006/04/04 15:32:12 albertel Exp $ # # Copyright Michigan State University Board of Trustees # @@ -28,13 +28,6 @@ # # (Handler to resolve ambiguous file locations # -# (TeX Content Handler -# -# 05/29/00,05/30,10/11 Gerd Kortemeyer) -# -# 10/11,10/12 Gerd Kortemeyer) -# -# 10/16 Gerd Kortemeyer package Apache::lonsequence; @@ -42,110 +35,320 @@ use strict; use Apache::lonnet; use Apache::Constants qw(:common :http REDIRECT); use GDBM_File; +use Apache::lonratedt; +use Apache::lonratsrv; +use Apache::lonpageflip; +use Apache::loncommon; +use Apache::lonlocal; + +my %selhash; +my $successtied; + +# ----------------------------------------- Attempt to read from resource space + +sub attemptread { + my $fn=shift; + &Apache::lonnet::repcopy($fn); + if (-e $fn) { + return &Apache::lonratedt::attemptread($fn); + } else { + return (); + } +} +sub mapread { + my $fn=shift; + &Apache::lonnet::repcopy($fn); + if (-e $fn) { + return &Apache::lonratedt::mapread($fn,''); + } else { + return (); + } +} + +# ---------------------------------------------------------------- View Handler -# ----------------------------------------------------------- Could not resolve +sub viewmap { + my ($r,$url)=@_; -sub getlost { - my ($r,$errmsg)=@_; - $r->content_type('text/html'); - $r->send_http_header; - $r->print( - 'Unknown Error

'. - 'LON-CAPA

Could not handle sequence resource reference.

'.$errmsg. - ''); + my $js; + if ($env{'form.forceselect'}) { + $js = (< + +function select_group() { + window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value; } +function queue(val) { + if (eval("document.forms."+val+".filelink.checked")) { + var l=val.length; + var v=val.substring(4,l); + document.forms.fileattr.acts.value+='1a'+v+'b'; + } + else { + var l=val.length; + var v=val.substring(4,l); + document.forms.fileattr.acts.value+='0a'+v+'b'; + } +} + + +ENDSCRIPT + } + + $r->print(&Apache::loncommon::start_page('Map Contents',$js). + '

'.$url.'

'); +# ------------------ This is trying to select. Provide buttons and tie %selhash + if ($env{'form.forceselect'}) { $r->print(< + + + +ENDSELECT + my $diropendb = + "/home/httpd/perl/tmp/$env{'user.domain'}\_$env{'user.name'}_groupsec.db"; + if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) { + if ($env{'form.launch'} eq '1') { + &start_fresh_session(); + } + $successtied=1; + +# - Evaluate actions from previous page (both cumulatively and chronologically) + if ($env{'form.catalogmode'} eq 'groupimport') { + my $acts=$env{'form.acts'}; + my @Acts=split(/b/,$acts); + my %ahash; + my %achash; + my $ac=0; + # some initial hashes for working with data + foreach (@Acts) { + my ($state,$ref)=split(/a/); + $ahash{$ref}=$state; + $achash{$ref}=$ac; + $ac++; + } + # sorting through the actions and changing the tied database hash + foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) { + my $key=$_; + if ($ahash{$key} eq '1') { + $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}= + $selhash{'pre_'.$key.'_title'}; + $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}= + $selhash{'storectr'}+0; + $selhash{'storectr'}++; + } + if ($ahash{$key} eq '0') { + if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) { + delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}; + } + } + } + # deleting the previously cached listing + foreach (keys %selhash) { + if ($_ =~ /^pre_/ && $_ =~/link$/) { + my $key = $_; + $key =~ s/^pre_//; + $key =~ s/_[^_]*$//; + delete $selhash{'pre_'.$key.'_title'}; + delete $selhash{'pre_'.$key.'_link'}; + } + } + } +# - + } + } +# ----------------------------- successtied is now '1' if in working selectmode + my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),''); + if ($fatal==1) { + $r->print('

'.&mt('Map contents are not shown in order.').'


'); + } + my $idx=0; + foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) { + if (defined($_)) { + $idx++; + if ($successtied) { + $r->print('
'); + } + my ($title,$url)=split(/\:/,$_); + $title=~s/\&colon\;/\:/g; + $url=~s/\&colon\;/\:/g; + unless ($title) { $title=(split(/\//,$url))[-1] }; + unless ($title) { $title=''.&mt('Empty').''; } + if ($url) { + if ($successtied) { + my $checked=''; + if ($selhash{'store_'.$url}) { + $checked=" checked"; + } + $selhash{"pre_${idx}_link"}=$url; + $selhash{"pre_${idx}_title"}=$title; + + $r->print(< + +ENDCHECKBOX + } + $r->print(''); + } + $r->print(&Apache::lonratsrv::qtescape($title)); + if ($url) { $r->print(''); } + if ($successtied) { + $r->print(''); + } else { + $r->print('
'); + } + } + } + $r->print(&Apache::loncommon::end_page()); + if ($successtied) { + untie %selhash; + } +} + +# ----------------------------------------------------------- Clean out selhash +sub start_fresh_session { + foreach (keys %selhash) { + if ($_ =~ /^pre_/) { + delete $selhash{$_}; + } + if ($_ =~ /^store/) { + delete $selhash{$_}; + } + } +} + + # ================================================================ Main Handler sub handler { my $r=shift; if ($r->header_only) { - $r->content_type('text/html'); + &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; return OK; } + + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['forceselect','launch']); my %hash; my %bighash; my $requrl=$r->uri; + $successtied=0; # ------------------------------------------------------------ Tie symb db file - if ($ENV{'request.course.fn'}) { + my $disurl=''; + my $dismapid=''; + my $exitdisid = ''; + my $arrow_dir = ''; + + if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) { my $last; - if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', - &GDBM_READER,0640)) { + if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { $last=$hash{'last_direction'}; untie(%hash); } my $direction=''; my $prevmap=''; if ($last) { - ($prevmap,$direction)=(split(/\_\_\_/,$last)); + ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last); } # ------------------------------------------------------------- Tie big db file - if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', - &GDBM_READER,0640)) { + if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db', + &GDBM_READER(),0640)) { my $disid=''; - my $whatend=''; + my $randomout =''; + if ($direction eq 'back') { $disid=$bighash{'map_finish_'.$requrl}; - $whatend='End'; } else { $disid=$bighash{'map_start_'.$requrl}; - $whatend='Beginning'; - } - my $disurl=''; - my $dismapid=''; + } if ($disid) { $disurl=$bighash{'src_'.$disid}; $dismapid=(split(/\./,$disid))[1]; + if (!$env{'request.role.adv'}) { + $randomout = $bighash{'randomout_'.$disid}; + } + } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { + $last=$hash{'last_known'}; + untie(%hash); } - my $symb=''; - my $sequencetitle=''; - unless($disurl) { - if ($symb=&Apache::lonnet::symbread()) { - my ($mapurl,$mapid)=split(/\_\_\_/,$symb); - $sequencetitle=$bighash{'title_'. - $bighash{'map_pc_/res/'.$mapurl}.'.'. - $mapid}; + + +# ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one + while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) { + $direction=($direction?$direction:'forward'); + ($disid,$requrl)= + &Apache::lonpageflip::fullmove($disid, + &Apache::lonnet::declutter($requrl),$direction); + if ($disid) { + $disurl=$bighash{'src_'.$disid}; + $dismapid=(split(/\./,$disid))[1]; + if (!$env{'request.role.adv'}) { + $randomout = $bighash{'randomout_'.$disid}; + } } - } + } + $exitdisid = $disid; + $arrow_dir = $direction; + # --------------------------------------- Untie hash, make sure to come by here untie(%bighash); - if ($disurl) { + } + } + +# now either disurl is set (going to first page), or we need another display + if ($disurl) { # -------------------------------------------------- Has first or last resource - &Apache::lonnet::symblist($requrl,$disurl => $dismapid, - 'last_known' => &Apache::lonnet::declutter($disurl)); - $r->content_type('text/html'); - $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl); - return REDIRECT; - } else { -# ---------- Does not have first or last resource, try to find out where we are - unless ($symb) { - $r->internal_redirect('/adm/ambiguous'); - } - $r->content_type('text/html'); - $r->send_http_header; - $r->print(< -

$whatend of

-

$sequencetitle

- -ENDSYMB - return OK + &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid], + 'last_known' => [$disurl,$dismapid]); + &Apache::loncommon::content_type($r,'text/html'); + $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl); + return REDIRECT; + } else { + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + if ($exitdisid eq '' && $arrow_dir ne '') { + my %lt =&Apache::lonlocal::texthash( + 'back' => 'beginning', + 'forward' => 'end', + 'nere' => 'Next resource could not be displayed', + 'goba' => 'Go Back', + 'nacc' => 'Navigate Course Content', + ); + my $warnmsg = &mt('As all folders and sequences '); + if ($arrow_dir eq 'forward') { + $warnmsg .= &mt('following the current resource were empty').','; + } elsif ($arrow_dir eq 'back') { + $warnmsg .= &mt('preceding the current resource were empty').','; } + $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.'); + my $start_page= + &Apache::loncommon::start_page('Empty Folder/Sequence'); + my $end_page= + &Apache::loncommon::end_page(); + $r->print(<$lt{'nere'} +

$warnmsg

+ +$end_page +ENDNONE } else { - &getlost($r,'Could not access course structure.'); - return OK; + &viewmap($r,$requrl); } - } else { - $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized"; - return HTTP_NOT_ACCEPTABLE; + return OK; } - - return OK; } 1; 500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.