--- rat/lonpageflip.pm 2000/10/07 22:30:30 1.3 +++ rat/lonpageflip.pm 2000/11/14 19:14:03 1.12 @@ -10,12 +10,12 @@ # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, # 10/02 Gerd Kortemeyer) # -# 10/03,10/05,10/06,10/07 Gerd Kortemeyer +# 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17,11/14 Gerd Kortemeyer package Apache::lonpageflip; use strict; -use Apache::Constants qw(:common :http); +use Apache::Constants qw(:common :http REDIRECT); use Apache::lonnet(); use HTML::TokeParser; use GDBM_File; @@ -25,7 +25,8 @@ use GDBM_File; my %hash; sub addrid { - my ($current,$new)=@_; + my ($current,$new,$condid)=@_; + unless ($condid) { $condid=0; } if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { if ($current) { $current.=','.$new; @@ -49,73 +50,224 @@ sub handler { return OK; } - -# --------BEGIN DEBUG ONLY TRASH - $r->content_type('text/html'); - $r->send_http_header; - - $r->print(''); -# --------END DEBUG ONLY TRASH - - my %cachehash=(); - my $redir=0; + my %cachehash=(); + my $multichoice=0; + my %multichoicehash=(); + my $redirecturl=''; + my $next=''; + my @possibilities=(); if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { $ENV{'form.postdata'}=~/(\w+)\:(.*)/; my $direction=$1; my $currenturl=$2; - my $redirecturl=$currenturl; + if ($direction eq 'return') { +# -------------------------------------------------------- Return to last known + my $last; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', + &GDBM_READER,0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + my $newloc; + if ($last) { + $newloc='/res/'.(split(/\_\_\_/,$last))[1]; + } else { + $newloc='/adm/noidea.html'; + } + $r->content_type('text/html'); + $r->header_out(Location => + 'http://'.$ENV{'HTTP_HOST'}.$newloc); + + return REDIRECT; + } $currenturl=~s/^http\:\/\///; $currenturl=~s/^[^\/]+//; + unless ($currenturl=~/\/res\//) { + my $last; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', + &GDBM_READER,0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + if ($last) { + $currenturl='/res/'.(split(/\_\_\_/,$last))[1]; + } else { + $r->content_type('text/html'); + $r->header_out(Location => + 'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html'); + return REDIRECT; + } + } # ------------------------------------------- Do we have any idea where we are? my $position; if ($position=Apache::lonnet::symbread($currenturl)) { # ------------------------------------------------------------------------- Yes my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); $cachehash{$thisurl}=$mapnum; +# ============================================================ Tie the big hash if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', &GDBM_READER,0640)) { my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum; my $next=''; + my $mincond=1; + my $posnext=''; if ($direction eq 'forward') { - map { - $next=&addrid($next,$hash{'goesto_'.$_}); +# --------------------------------------------------------------------- Forward + map { + my $thiscond= + &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); + if ($thiscond>=$mincond) { + if ($posnext) { + $posnext.=','.$_.':'.$thiscond; + } else { + $posnext=$_.':'.$thiscond; + } + if ($thiscond>$mincond) { $mincond=$thiscond; } + } } split(/\,/,$hash{'to_'.$rid}); - my @possibilities=split(/,/,$next); - if ($#possibilities==1) { - my $goto=$possibilities[0]; - } + map { + my ($linkid,$condval)=split(/\:/,$_); + if ($condval>=$mincond) { + $next=&addrid($next,$hash{'goesto_'.$linkid}, + $hash{'condid_'.$hash{'undercond_'.$linkid}}); + } + } split(/\,/,$posnext); } elsif ($direction eq 'back') { - } elsif ($direction eq 'up') { +# ------------------------------------------------------------------- Backwards + map { + my $thiscond= + &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); + if ($thiscond>=$mincond) { + if ($posnext) { + $posnext.=','.$_.':'.$thiscond; + } else { + $posnext=$_.':'.$thiscond; + } + if ($thiscond>$mincond) { $mincond=$thiscond; } + } + } split(/\,/,$hash{'from_'.$rid}); + map { + my ($linkid,$condval)=split(/\:/,$_); + if ($condval>=$mincond) { + $next=&addrid($next,$hash{'comesfrom_'.$linkid}, + $hash{'condid_'.$hash{'undercond_'.$linkid}}); + } + } split(/\,/,$posnext); + } elsif ($direction eq 'up') { +# -------------------------------------------------------------------------- Up } elsif ($direction eq 'down') { +# ------------------------------------------------------------------------ Down + } +# ----------------------------------------------------- Check out possibilities + if ($next) { + @possibilities=split(/\,/,$next); + if ($#possibilities==0) { +# ---------------------------------------------- Only one possibility, redirect + $redirecturl=$hash{'src_'.$next}; + $cachehash{&Apache::lonnet::declutter($redirecturl)} + =(split(/\./,$next))[1]; + if ($hash{'param_'.$next}) { + my ($mapid,$resid)=split(/\./,$next); + &Apache::lonnet::appendparms( + &Apache::lonnet::declutter($hash{'map_id_'.$mapid}). + '___'.$resid.'___'. + &Apache::lonnet::declutter($redirecturl), + $hash{'param_'.$next}); + } + } else { +# ------------------------ There are multiple possibilities for a next resource + $multichoice=1; + map { + $multichoicehash{'src_'.$_}=$hash{'src_'.$_}; + $multichoicehash{'title_'.$_}=$hash{'title_'.$_}; + $multichoicehash{'type_'.$_}=$hash{'type_'.$_}; + $cachehash + {&Apache::lonnet::declutter( + $multichoicehash + {'src_'.$_} + )} + =(split(/\./,$_))[1]; + if ($hash{'param_'.$_}) { + my ($mapid,$resid)=split(/\./,$_); + &Apache::lonnet::appendparms( + &Apache::lonnet::declutter($hash{'map_id_'.$mapid}). + '___'.$resid.'___'. + &Apache::lonnet::declutter($hash{'src_'.$_}), + $hash{'param_'.$_}); + } + } @possibilities; + } + } else { +# -------------------------------------------------------------- No place to go + $multichoice=-1; } +# ----------------- The program must come past this point to untie the big hash untie(%hash); - $r->print($rid.' - '.$next); +# --------------------------------------------------------- Store position info + $cachehash{'last_direction'}=$direction; + $cachehash{'last_known'}=&Apache::lonnet::declutter($currenturl); + &Apache::lonnet::symblist($mapurl,%cachehash); +# ============================================== Do not return before this line + if ($redirecturl) { +# ----------------------------------------------------- There is a URL to go to + $r->content_type('text/html'); + $r->header_out(Location => + 'http://'.$ENV{'HTTP_HOST'}.$redirecturl); + return REDIRECT; + } else { +# --------------------------------------------------------- There was a problem + $r->content_type('text/html'); + $r->send_http_header; + if ($#possibilities>0) { + $r->print(<Choose Next Location + +

LON-CAPA

+There are several possibilities of where to go next. +

+Please click on the the resource you intend to access: +

+ + +ENDSTART + map { + $r->print( + ''); + } @possibilities; + $r->print('
TitleType
'. + $multichoicehash{'title_'.$_}. + ''.$multichoicehash{'type_'.$_}. + '
'); + return OK; + } else { + $r->print(<Choose Next Location + + +

Sorry!

+

Next resource could not be identified.

+ + +ENDNONE + return OK; + } + } + } else { +# ------------------------------------------------- Problem, could not tie hash + $ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; + return HTTP_NOT_ACCEPTABLE; } } else { -# -------------------------------------------------------------------------- No - $r->print('No idea '.$currenturl); +# ---------------------------------------- No, could not determine where we are + $r->internal_redirect('/adm/ambiguous'); } -# -------------------------- Class was not initialized or page fliped strangely } else { +# -------------------------- Class was not initialized or page fliped strangely $ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; return HTTP_NOT_ACCEPTABLE; } - - - - -# ------TRASH BELOW -# --------------------------- TRASH - - $r->print(''); - return OK; - - -# ========================================================= TOTAL TRASH - -# &Apache::lonnet::symblist($requrl,%symbhash); - } 1;