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Diff for /loncom/interface/loncommon.pm between versions 1.7 and 1.20

version 1.7, 2001/10/26 17:09:04 version 1.20, 2001/12/25 21:02:35
Line 1 Line 1
 # The LearningOnline Network  # The LearningOnline Network with CAPA
 # a pile of common routines  # a pile of common routines
 # 2/13 Guy Albertelli  #
   # $Id$
   #
   # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
   # YEAR=2001
   # 2/13-12/7 Guy Albertelli
   # 12/11,12/12,12/17 Scott Harrison
   # 12/21 Gerd Kortemeyer
   # 12/21 Scott Harrison
   # 12/25 Gerd Kortemeyer
   
 # Makes a table out of the previous attempts  # Makes a table out of the previous attempts
 # Inputs result_from_symbread, user, domain, course_id  # Inputs result_from_symbread, user, domain, course_id
   # Reads in non-network-related .tab files
   
 package Apache::loncommon;  package Apache::loncommon;
   
 use strict;  use strict;
   use POSIX qw(strftime);
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
 use Apache::lonmsg();  use Apache::lonmsg();
   
   # ----------------------------------------------- Filetypes/Languages/Copyright
   my %language;
   my %cprtag;
   my %fe; my %fd;
   my %fc;
   
   # -------------------------------------------------------------- Thesaurus data
   my @therelated=();
   my @theword=();
   my @thecount=();
   my %theindex=();
   my $thetotalcount=0;
   my $thefuzzy=2;
   my $thethreshold=0.1/$thefuzzy;
   my $theavecount;
   
   # ----------------------------------------------------------------------- BEGIN
   BEGIN {
   # ------------------------------------------------------------------- languages
       {
    my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
    '/language.tab');
    if ($fh) {
       while (<$fh>) {
    next if /^\#/;
    chomp;
    my ($key,$val)=(split(/\s+/,$_,2));
    $language{$key}=$val;
       }
    }
       }
   # ------------------------------------------------------------------ copyrights
       {
    my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonIncludes'}.
     '/copyright.tab');
    if ($fh) {
       while (<$fh>) {
    next if /^\#/;
    chomp;
    my ($key,$val)=(split(/\s+/,$_,2));
    $cprtag{$key}=$val;
       }
    }
       }
   # ------------------------------------------------------------- file categories
       {
    my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
     '/filecategories.tab');
    if ($fh) {
       while (<$fh>) {
    next if /^\#/;
    chomp;
    my ($key,$val)=(split(/\s+/,$_,2));
    push @{$fc{$key}},$val;
       }
    }
       }
   # ------------------------------------------------------------------ file types
       {
    my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
          '/filetypes.tab');
    if ($fh) {
               while (<$fh>) {
    next if (/^\#/);
    chomp;
    my ($ending,$emb,$descr)=split(/\s+/,$_,3);
    if ($descr ne '') { 
       $fe{$ending}=lc($emb);
       $fd{$ending}=$descr;
    }
       }
    }
       }
   # -------------------------------------------------------------- Thesaurus data
       {
    my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
          '/thesaurus.dat');
    if ($fh) {
               while (<$fh>) {
                  my ($tword,$tindex,$tcount,$trelated)=split(/\@/,$_);
                  $theindex{$tword}=$tindex;
                  $theword[$tindex]=$tword;
                  $thecount[$tindex]=$tcount;
                  $thetotalcount+=$tcount;
                  $therelated[$tindex]=$trelated;
      }
           }
           $theavecount=$thetotalcount/$#thecount;
       }
   }
   # ============================================================= END BEGIN BLOCK
   
   
   # ---------------------------------------------------------- Is this a keyword?
   
   sub keyword {
       my $newword=shift;
       $newword=~s/\W//g;
       $newword=~tr/A-Z/a-z/;
       my $tindex=$theindex{$newword};
       if ($tindex) {
           if ($thecount[$tindex]>$theavecount) {
              return 1;
           }
       }
       return 0;
   }
   # -------------------------------------------------------- Return related words
   
   sub related {
       my $newword=shift;
       $newword=~s/\W//g;
       $newword=~tr/A-Z/a-z/;
       my $tindex=$theindex{$newword};
       if ($tindex) {
           my %found=();
           foreach (split(/\,/,$therelated[$tindex])) {
   # - Related word found
               my ($ridx,$rcount)=split(/\:/,$_);
   # - Direct relation index
               my $directrel=$rcount/$thecount[$tindex];
               if ($directrel>$thethreshold) {
                  foreach (split(/\,/,$therelated[$ridx])) {
                     my ($rridx,$rrcount)=split(/\:/,$_);
                     if ($rridx==$tindex) {
   # - Determine reverse relation index
                        my $revrel=$rrcount/$thecount[$ridx];
   # - Calculate full index
                        $found{$ridx}=$directrel*$revrel;
                        if ($found{$ridx}>$thethreshold) {
                           foreach (split(/\,/,$therelated[$ridx])) {
                               my ($rrridx,$rrrcount)=split(/\:/,$_);
                               unless ($found{$rrridx}) {
                                  my $revrevrel=$rrrcount/$thecount[$ridx];
                                  if (
                             $directrel*$revrel*$revrevrel>$thethreshold
                                  ) {
                                     $found{$rrridx}=
                                          $directrel*$revrel*$revrevrel;
                                  }
                               }
                           }
                        }
                     }
                  }
               }
           }
       }
       return ();
   }
   
   # ---------------------------------------------------------------- Language IDs
   sub languageids {
       return sort(keys(%language));
   }
   
   # -------------------------------------------------------- Language Description
   sub languagedescription {
       return $language{shift(@_)};
   }
   
   # --------------------------------------------------------------- Copyright IDs
   sub copyrightids {
       return sort(keys(%cprtag));
   }
   
   # ------------------------------------------------------- Copyright Description
   sub copyrightdescription {
       return $cprtag{shift(@_)};
   }
   
   # ------------------------------------------------------------- File Categories
   sub filecategories {
       return sort(keys(%fc));
   }
   
   # -------------------------------------- File Types within a specified category
   sub filecategorytypes {
       return @{$fc{lc(shift(@_))}};
   }
   
   # ------------------------------------------------------------------ File Types
   sub fileextensions {
       return sort(keys(%fe));
   }
   
   # ------------------------------------------------------------- Embedding Style
   sub fileembstyle {
       return $fe{lc(shift(@_))};
   }
   
   # ------------------------------------------------------------ Description Text
   sub filedescription {
       return $fd{lc(shift(@_))};
   }
   
   # ------------------------------------------------------------ Description Text
   sub filedescriptionex {
       my $ex=shift;
       return '.'.$ex.' '.$fd{lc($ex)};
   }
   
 sub get_previous_attempt {  sub get_previous_attempt {
   my ($symb,$username,$domain,$course)=@_;    my ($symb,$username,$domain,$course)=@_;
   my $prevattempts='';    my $prevattempts='';
Line 21  sub get_previous_attempt { Line 255  sub get_previous_attempt {
       my %lasthash=();        my %lasthash=();
       my $version;        my $version;
       for ($version=1;$version<=$returnhash{'version'};$version++) {        for ($version=1;$version<=$returnhash{'version'};$version++) {
         map {          foreach (sort(split(/\:/,$returnhash{$version.':keys'}))) {
   $lasthash{$_}=$returnhash{$version.':'.$_};    $lasthash{$_}=$returnhash{$version.':'.$_};
         } sort(split(/\:/,$returnhash{$version.':keys'}));          }
       }        }
       $prevattempts='<table border=2></tr><th>History</th>';        $prevattempts='<table border=2></tr><th>History</th>';
       map {        foreach (sort(keys %lasthash)) {
         $prevattempts.='<th>'.$_.'</th>';          $prevattempts.='<th>'.$_.'</th>';
       } sort(keys %lasthash);        }
       for ($version=1;$version<=$returnhash{'version'};$version++) {        for ($version=1;$version<=$returnhash{'version'};$version++) {
         $prevattempts.='</tr><tr><th>Attempt '.$version.'</th>';          $prevattempts.='</tr><tr><th>Attempt '.$version.'</th>';
         map {          foreach (sort(keys %lasthash)) {
   my $value;    my $value;
   if ($_ =~ /timestamp/) {    if ($_ =~ /timestamp/) {
     $value=scalar(localtime($returnhash{$version.':'.$_}));      $value=scalar(localtime($returnhash{$version.':'.$_}));
Line 39  sub get_previous_attempt { Line 273  sub get_previous_attempt {
     $value=$returnhash{$version.':'.$_};      $value=$returnhash{$version.':'.$_};
   }    }
   $prevattempts.='<td>'.$value.'</td>';       $prevattempts.='<td>'.$value.'</td>';   
         } sort(keys %lasthash);          }
       }        }
       $prevattempts.='</tr><tr><th>Current</th>';        $prevattempts.='</tr><tr><th>Current</th>';
       map {        foreach (sort(keys %lasthash)) {
  my $value;   my $value;
  if ($_ =~ /timestamp/) {   if ($_ =~ /timestamp/) {
   $value=scalar(localtime($lasthash{$_}));    $value=scalar(localtime($lasthash{$_}));
Line 50  sub get_previous_attempt { Line 284  sub get_previous_attempt {
   $value=$lasthash{$_};    $value=$lasthash{$_};
  }   }
  $prevattempts.='<td>'.$value.'</td>';   $prevattempts.='<td>'.$value.'</td>';
       } sort(keys %lasthash);        }
       $prevattempts.='</tr></table>';        $prevattempts.='</tr></table>';
     } else {      } else {
       $prevattempts='Nothing submitted - no attempts.';        $prevattempts='Nothing submitted - no attempts.';
Line 60  sub get_previous_attempt { Line 294  sub get_previous_attempt {
   }    }
 }  }
   
   sub get_student_view {
     my ($symb,$username,$domain,$courseid) = @_;
     my ($map,$id,$feedurl) = split(/___/,$symb);
     my (%old,%moreenv);
     my @elements=('symb','courseid','domain','username');
     foreach my $element (@elements) {
       $old{$element}=$ENV{'form.grade_'.$element};
       $moreenv{'form.grade_'.$element}=eval '$'.$element #'
     }
     &Apache::lonnet::appenv(%moreenv);
     my $userview=&Apache::lonnet::ssi('/res/'.$feedurl);
     &Apache::lonnet::delenv('form.grade_');
     foreach my $element (@elements) {
       $ENV{'form.grade_'.$element}=$old{$element};
     }
     $userview=~s/\<body[^\>]*\>//gi;
     $userview=~s/\<\/body\>//gi;
     $userview=~s/\<html\>//gi;
     $userview=~s/\<\/html\>//gi;
     $userview=~s/\<head\>//gi;
     $userview=~s/\<\/head\>//gi;
     $userview=~s/action\s*\=/would_be_action\=/gi;
     return $userview;
   }
   
   sub get_student_answers {
     my ($symb,$username,$domain,$courseid) = @_;
     my ($map,$id,$feedurl) = split(/___/,$symb);
     my (%old,%moreenv);
     my @elements=('symb','courseid','domain','username');
     foreach my $element (@elements) {
       $old{$element}=$ENV{'form.grade_'.$element};
       $moreenv{'form.grade_'.$element}=eval '$'.$element #'
     }
     $moreenv{'form.grade_target'}='answer';
     &Apache::lonnet::appenv(%moreenv);
     my $userview=&Apache::lonnet::ssi('/res/'.$feedurl);
     &Apache::lonnet::delenv('form.grade_');
     foreach my $element (@elements) {
       $ENV{'form.grade_'.$element}=$old{$element};
     }
     $userview=~s/\<body[^\>]*\>//gi;
     $userview=~s/\<\/body\>//gi;
     $userview=~s/\<html\>//gi;
     $userview=~s/\<\/html\>//gi;
     $userview=~s/\<head\>//gi;
     $userview=~s/\<\/head\>//gi;
     $userview=~s/action\s*\=/would_be_action\=/gi;
     return $userview;
   }
   
 sub get_unprocessed_cgi {  sub get_unprocessed_cgi {
   my ($query)= @_;    my ($query)= @_;
   map {    foreach (split(/&/,$query)) {
     my ($name, $value) = split(/=/,$_);      my ($name, $value) = split(/=/,$_);
     $value =~ tr/+/ /;      $value =~ tr/+/ /;
     $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;      $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
     if (!defined($ENV{'form.'.$name})) { $ENV{'form.'.$name}=$value; }      if (!defined($ENV{'form.'.$name})) { $ENV{'form.'.$name}=$value; }
   } (split(/&/,$query));    }
 }  }
   
 sub cacheheader {  sub cacheheader {
   my $date=localtime;    my $date=strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime);
   my $output .='<meta HTTP-EQUIV="Expires" CONTENT="'.$date.'" />    my $output .='<meta HTTP-EQUIV="Expires" CONTENT="'.$date.'" />
                 <meta HTTP-EQUIV="Cache-control" CONTENT="no-cache" />                  <meta HTTP-EQUIV="Cache-control" CONTENT="no-cache" />
                 <meta HTTP-EQUIV="Pragma" CONTENT="no-cache" />';                  <meta HTTP-EQUIV="Pragma" CONTENT="no-cache" />';
   return $output;    return $output;
 }  }
   
   sub no_cache {
     my ($r) = @_;
     my $date=strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime);
     $r->no_cache(1);
     $r->header_out("Pragma" => "no-cache");
     $r->header_out("Expires" => $date);
   }
 1;  1;
 __END__;  __END__;
   
   
   =head1 NAME
   
   Apache::loncommon - pile of common routines
   
   =head1 SYNOPSIS
   
   Referenced by other mod_perl Apache modules.
   
   Invocation:
    &Apache::loncommon::SUBROUTINENAME(ARGUMENTS);
   
   =head1 INTRODUCTION
   
   Common collection of used subroutines.  This collection helps remove
   redundancy from other modules and increase efficiency of memory usage.
   
   Current things done:
   
    Makes a table out of the previous homework attempts
    Inputs result_from_symbread, user, domain, course_id
    Reads in non-network-related .tab files
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 HANDLER SUBROUTINE
   
   There is no handler subroutine.
   
   =head1 OTHER SUBROUTINES
   
   =over 4
   
   =item *
   
   BEGIN() : initialize values from language.tab, copyright.tab, filetypes.tab,
   and filecategories.tab.
   
   =item *
   
   languageids() : returns list of all language ids
   
   =item *
   
   languagedescription() : returns description of a specified language id
   
   =item *
   
   copyrightids() : returns list of all copyrights
   
   =item *
   
   copyrightdescription() : returns description of a specified copyright id
   
   =item *
   
   filecategories() : returns list of all file categories
   
   =item *
   
   filecategorytypes() : returns list of file types belonging to a given file
   category
   
   =item *
   
   fileembstyle() : returns embedding style for a specified file type
   
   =item *
   
   filedescription() : returns description for a specified file type
   
   =item *
   
   filedescriptionex() : returns description for a specified file type with
   extra formatting
   
   =item *
   
   get_previous_attempt() : return string with previous attempt on problem
   
   =item *
   
   get_student_view() : show a snapshot of what student was looking at
   
   =item *
   
   get_student_answers() : show a snapshot of how student was answering problem
   
   =item *
   
   get_unprocessed_cgi() : get unparsed CGI parameters
   
   =item *
   
   cacheheader() : returns cache-controlling header code
   
   =item *
   
   nocache() : specifies header code to not have cache
   
   =back
   
   =cut
Removed from v.1.7  
changed lines
  Added in v.1.20

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