--- rat/lonpageflip.pm 2000/10/09 19:37:35 1.4 +++ rat/lonpageflip.pm 2000/11/16 11:58:30 1.13 @@ -10,7 +10,8 @@ # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, # 10/02 Gerd Kortemeyer) # -# 10/03,10/05,10/06,10/07,10/09 Gerd Kortemeyer +# 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17, +# 11/14,11/16 Gerd Kortemeyer package Apache::lonpageflip; @@ -29,9 +30,9 @@ sub addrid { unless ($condid) { $condid=0; } if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { if ($current) { - $current.=','.$new.':'.$condid; + $current.=','.$new; } else { - $current=''.$new.':'.$condid; + $current=''.$new; } } return $current; @@ -50,7 +51,9 @@ sub handler { return OK; } - my %cachehash=(); + my %cachehash=(); + my $multichoice=0; + my %multichoicehash=(); my $redirecturl=''; my $next=''; my @possibilities=(); @@ -59,80 +62,197 @@ sub handler { $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,$hash{'goesto_'.$_}, - $hash{'condid_'.$hash{'undercond_'.$_}}); +# --------------------------------------------------------------------- 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}); + 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') { - map { - $next=&addrid($next,$hash{'comesfrom_'.$_}, - $hash{'condid_'.$hash{'undercond_'.$_}}); +# ------------------------------------------------------------------- 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') { - } - my $redirectid=''; +# ------------------------------------------------------------------------ Down + } # ----------------------------------------------------- Check out possibilities if ($next) { @possibilities=split(/\,/,$next); if ($#possibilities==0) { - $redirectid=(split(/\:/,$next))[0]; +# ---------------------------------------------- Only one possibility, redirect + $redirecturl=$hash{'src_'.$next}; + $cachehash{&Apache::lonnet::declutter($redirecturl)} + =(split(/\./,$next))[1]; } 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(/\./,$_))[1]; + } @possibilities; } - } - if ($redirectid) { - $redirecturl=$hash{'src_'.$redirectid}; + } else { +# -------------------------------------------------------------- No place to go + $multichoice=-1; } +# ----------------- The program must come past this point to untie the big hash untie(%hash); +# --------------------------------------------------------- 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, could not determine where we are + $r->internal_redirect('/adm/ambiguous'); } -# -------------------------------------------------------- No, could not decide - } - $r->content_type('text/html'); - $r->send_http_header; - - $r->print(''); - -# -------------------------- 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;