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Diff for /loncom/interface/loncommon.pm between versions 1.36 and 1.171

version 1.36, 2002/04/26 18:57:27 version 1.171, 2004/01/13 15:48:25
Line 25 Line 25
 #  #
 # http://www.lon-capa.org/  # 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  
 # 12/25,12/28 Gerd Kortemeyer  
 # YEAR=2002  
 # 1/4 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
Line 40 Line 32
   
 # POD header:  # POD header:
   
   =pod
   
 =head1 NAME  =head1 NAME
   
 Apache::loncommon - pile of common routines  Apache::loncommon - pile of common routines
   
 =head1 SYNOPSIS  =head1 SYNOPSIS
   
 Referenced by other mod_perl Apache modules.  Common routines for manipulating connections, student answers,
       domains, common Javascript fragments, etc.
 Invocation:  
  &Apache::loncommon::SUBROUTINENAME(ARGUMENTS);  
   
 =head1 INTRODUCTION  =head1 OVERVIEW
   
 Common collection of used subroutines.  This collection helps remove  A collection of commonly used subroutines that don't have a natural
   home anywhere else. This collection helps remove
 redundancy from other modules and increase efficiency of memory usage.  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.  
   
 =head2 Subroutines  
   
 =over 4  
   
 =cut   =cut 
   
 # End of POD header  # End of POD header
Line 76  package Apache::loncommon; Line 56  package Apache::loncommon;
   
 use strict;  use strict;
 use Apache::lonnet();  use Apache::lonnet();
 use POSIX qw(strftime);  use GDBM_File;
 use Apache::Constants qw(:common);  use POSIX qw(strftime mktime);
   use Apache::Constants qw(:common :http :methods);
 use Apache::lonmsg();  use Apache::lonmsg();
   use Apache::lonmenu();
   use Apache::lonlocal;
   use HTML::Entities;
   
 my $readit;  my $readit;
   
   ##
   ## Global Variables
   ##
   
 # ----------------------------------------------- Filetypes/Languages/Copyright  # ----------------------------------------------- Filetypes/Languages/Copyright
 my %language;  my %language;
   my %supported_language;
 my %cprtag;  my %cprtag;
 my %fe; my %fd;  my %fe; my %fd;
 my %fc;  my %category_extensions;
   
 # -------------------------------------------------------------- Thesaurus data  # ---------------------------------------------- Designs
 my @therelated;  
 my @theword;  
 my @thecount;  
 my %theindex;  
 my $thetotalcount;  
 my $thefuzzy=2;  
 my $thethreshold=0.1/$thefuzzy;  
 my $theavecount;  
   
 # ----------------------------------------------------------------------- BEGIN  my %designhash;
 =item BEGIN()   
   
 Initialize values from language.tab, copyright.tab, filetypes.tab,  # ---------------------------------------------- Thesaurus variables
 and filecategories.tab.  #
   # %Keywords:
   #      A hash used by &keyword to determine if a word is considered a keyword.
   # $thesaurus_db_file 
   #      Scalar containing the full path to the thesaurus database.
   
 =cut  my %Keywords;
 # ----------------------------------------------------------------------- BEGIN  my $thesaurus_db_file;
   
   #
   # Initialize values from language.tab, copyright.tab, filetypes.tab,
   # thesaurus.tab, and filecategories.tab.
   #
 BEGIN {  BEGIN {
       # Variable initialization
       $thesaurus_db_file = $Apache::lonnet::perlvar{'lonTabDir'}."/thesaurus.db";
       #
     unless ($readit) {      unless ($readit) {
 # ------------------------------------------------------------------- languages  # ------------------------------------------------------------------- languages
     {      {
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.          my $langtabfile = $Apache::lonnet::perlvar{'lonTabDir'}.
  '/language.tab');                                     '/language.tab';
  if ($fh) {          if ( open(my $fh,"<$langtabfile") ) {
     while (<$fh>) {              while (<$fh>) {
  next if /^\#/;                  next if /^\#/;
  chomp;                  chomp;
  my ($key,$val)=(split(/\s+/,$_,2));                  my ($key,$two,$country,$three,$enc,$val,$sup)=(split(/\t/,$_));
  $language{$key}=$val;                  $language{$key}=$val.' - '.$enc;
     }                  if ($sup) {
  }                      $supported_language{$key}=$sup;
                   }
               }
               close($fh);
           }
     }      }
 # ------------------------------------------------------------------ copyrights  # ------------------------------------------------------------------ copyrights
     {      {
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonIncludes'}.          my $copyrightfile = $Apache::lonnet::perlvar{'lonIncludes'}.
   '/copyright.tab');                                    '/copyright.tab';
  if ($fh) {          if ( open (my $fh,"<$copyrightfile") ) {
     while (<$fh>) {              while (<$fh>) {
  next if /^\#/;                  next if /^\#/;
  chomp;                  chomp;
  my ($key,$val)=(split(/\s+/,$_,2));                  my ($key,$val)=(split(/\s+/,$_,2));
  $cprtag{$key}=$val;                  $cprtag{$key}=$val;
     }              }
  }              close($fh);
           }
     }      }
 # ------------------------------------------------------------- file categories  
   # -------------------------------------------------------------- domain designs
   
       my $filename;
       my $designdir=$Apache::lonnet::perlvar{'lonTabDir'}.'/lonDomColors';
       opendir(DIR,$designdir);
       while ($filename=readdir(DIR)) {
    my ($domain)=($filename=~/^(\w+)\./);
     {      {
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.          my $designfile = $designdir.'/'.$filename;
   '/filecategories.tab');          if ( open (my $fh,"<$designfile") ) {
  if ($fh) {              while (<$fh>) {
     while (<$fh>) {                  next if /^\#/;
  next if /^\#/;                  chomp;
  chomp;                  my ($key,$val)=(split(/\=/,$_));
  my ($key,$val)=(split(/\s+/,$_,2));                  if ($val) { $designhash{$domain.'.'.$key}=$val; }
  push @{$fc{$key}},$val;              }
     }              close($fh);
  }          }
     }      }
 # ------------------------------------------------------------------ file types  
       }
       closedir(DIR);
   
   
   # ------------------------------------------------------------- file categories
     {      {
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.          my $categoryfile = $Apache::lonnet::perlvar{'lonTabDir'}.
        '/filetypes.tab');                                    '/filecategories.tab';
  if ($fh) {          if ( open (my $fh,"<$categoryfile") ) {
             while (<$fh>) {              while (<$fh>) {
  next if (/^\#/);                  next if /^\#/;
  chomp;                  chomp;
  my ($ending,$emb,$descr)=split(/\s+/,$_,3);                  my ($extension,$category)=(split(/\s+/,$_,2));
  if ($descr ne '') {                   push @{$category_extensions{lc($category)}},$extension;
     $fe{$ending}=lc($emb);              }
     $fd{$ending}=$descr;              close($fh);
  }          }
     }  
  }  
     }      }
 # -------------------------------------------------------------- Thesaurus data  # ------------------------------------------------------------------ file types
     {      {
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.          my $typesfile = $Apache::lonnet::perlvar{'lonTabDir'}.
        '/thesaurus.dat');                 '/filetypes.tab';
  if ($fh) {          if ( open (my $fh,"<$typesfile") ) {
             while (<$fh>) {              while (<$fh>) {
                my ($tword,$tindex,$tcount,$trelated)=split(/\@/,$_);                  next if (/^\#/);
                $theindex{$tword}=$tindex;                  chomp;
                $theword[$tindex]=$tword;                  my ($ending,$emb,$descr)=split(/\s+/,$_,3);
                $thecount[$tindex]=$tcount;                  if ($descr ne '') {
                $thetotalcount+=$tcount;                      $fe{$ending}=lc($emb);
                $therelated[$tindex]=$trelated;                      $fd{$ending}=$descr;
    }                  }
               }
               close($fh);
         }          }
         $theavecount=$thetotalcount/$#thecount;  
     }      }
     &Apache::lonnet::logthis(      &Apache::lonnet::logthis(
               "<font color=yellow>INFO: Read file types and thesaurus</font>");                "<font color=yellow>INFO: Read file types</font>");
     $readit=1;      $readit=1;
 }      }  # end of unless($readit) 
           
 }  }
 # ============================================================= END BEGIN BLOCK  
   
 =item linked_select_forms(...)  ###############################################################
   ##           HTML and Javascript Helper Functions            ##
   ###############################################################
   
   =pod 
   
   =head1 HTML and Javascript Functions
   
   =over 4
   
   =item * browser_and_searcher_javascript ()
   
   X<browsing, javascript>X<searching, javascript>Returns a string
   containing javascript with two functions, C<openbrowser> and
   C<opensearcher>. Returned string does not contain E<lt>scriptE<gt>
   tags.
   
   =item * openbrowser(formname,elementname,only,omit) [javascript]
   
   inputs: formname, elementname, only, omit
   
   formname and elementname indicate the name of the html form and name of
   the element that the results of the browsing selection are to be placed in. 
   
   Specifying 'only' will restrict the browser to displaying only files
   with the given extension.  Can be a comma seperated list.
   
   Specifying 'omit' will restrict the browser to NOT displaying files
   with the given extension.  Can be a comma seperated list.
   
   =item * opensearcher(formname, elementname) [javascript]
   
   Inputs: formname, elementname
   
   formname and elementname specify the name of the html form and the name
   of the element the selection from the search results will be placed in.
   
   =cut
   
   sub browser_and_searcher_javascript {
       my $resurl=&lastresurl();
       return <<END;
       var editbrowser = null;
       function openbrowser(formname,elementname,only,omit,titleelement) {
           var url = '$resurl/?';
           if (editbrowser == null) {
               url += 'launch=1&';
           }
           url += 'catalogmode=interactive&';
           url += 'mode=edit&';
           url += 'form=' + formname + '&';
           if (only != null) {
               url += 'only=' + only + '&';
           } 
           if (omit != null) {
               url += 'omit=' + omit + '&';
           }
           if (titleelement != null) {
               url += 'titleelement=' + titleelement + '&';
           }
           url += 'element=' + elementname + '';
           var title = 'Browser';
           var options = 'scrollbars=1,resizable=1,menubar=0';
           options += ',width=700,height=600';
           editbrowser = open(url,title,options,'1');
           editbrowser.focus();
       }
       var editsearcher;
       function opensearcher(formname,elementname,titleelement) {
           var url = '/adm/searchcat?';
           if (editsearcher == null) {
               url += 'launch=1&';
           }
           url += 'catalogmode=interactive&';
           url += 'mode=edit&';
           url += 'form=' + formname + '&';
           if (titleelement != null) {
               url += 'titleelement=' + titleelement + '&';
           }
           url += 'element=' + elementname + '';
           var title = 'Search';
           var options = 'scrollbars=1,resizable=1,menubar=0';
           options += ',width=700,height=600';
           editsearcher = open(url,title,options,'1');
           editsearcher.focus();
       }
   END
   }
   
   sub lastresurl {
       if ($ENV{'environment.lastresurl'}) {
    return $ENV{'environment.lastresurl'}
       } else {
    return '/res';
       }
   }
   
   sub storeresurl {
       my $resurl=&Apache::lonnet::clutter(shift);
       unless ($resurl=~/^\/res/) { return 0; }
       $resurl=~s/\/$//;
       &Apache::lonnet::put('environment',{'lastresurl' => $resurl});
       &Apache::lonnet::appenv('environment.lastresurl' => $resurl);
       return 1;
   }
   
   sub studentbrowser_javascript {
      unless (
               (($ENV{'request.course.id'}) && 
                (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'})))
            || ($ENV{'request.role'}=~/^(au|dc|su)/)
             ) { return ''; }  
      return (<<'ENDSTDBRW');
   <script type="text/javascript" language="Javascript" >
       var stdeditbrowser;
       function openstdbrowser(formname,uname,udom,roleflag) {
           var url = '/adm/pickstudent?';
           var filter;
           eval('filter=document.'+formname+'.'+uname+'.value;');
           if (filter != null) {
              if (filter != '') {
                  url += 'filter='+filter+'&';
      }
           }
           url += 'form=' + formname + '&unameelement='+uname+
                                       '&udomelement='+udom;
    if (roleflag) { url+="&roles=1"; }
           var title = 'Student_Browser';
           var options = 'scrollbars=1,resizable=1,menubar=0';
           options += ',width=700,height=600';
           stdeditbrowser = open(url,title,options,'1');
           stdeditbrowser.focus();
       }
   </script>
   ENDSTDBRW
   }
   
   sub selectstudent_link {
      my ($form,$unameele,$udomele)=@_;
      if ($ENV{'request.course.id'}) {  
          unless (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'})) {
      return '';
          }
          return "<a href='".'javascript:openstdbrowser("'.$form.'","'.$unameele.
           '","'.$udomele.'");'."'>".&mt('Select User')."</a>";
      }
      if ($ENV{'request.role'}=~/^(au|dc|su)/) {
          return "<a href='".'javascript:openstdbrowser("'.$form.'","'.$unameele.
           '","'.$udomele.'",1);'."'>".&mt('Select User')."</a>";
      }
      return '';
   }
   
   sub coursebrowser_javascript {
       my ($domainfilter)=@_;
      return (<<ENDSTDBRW);
   <script type="text/javascript" language="Javascript" >
       var stdeditbrowser;
       function opencrsbrowser(formname,uname,udom) {
           var url = '/adm/pickcourse?';
           var filter;
           if (filter != null) {
              if (filter != '') {
                  url += 'filter='+filter+'&';
      }
           }
           var domainfilter='$domainfilter';
           if (domainfilter != null) {
              if (domainfilter != '') {
                  url += 'domainfilter='+domainfilter+'&';
      }
           }
           url += 'form=' + formname + '&cnumelement='+uname+
                                       '&cdomelement='+udom;
           var title = 'Course_Browser';
           var options = 'scrollbars=1,resizable=1,menubar=0';
           options += ',width=700,height=600';
           stdeditbrowser = open(url,title,options,'1');
           stdeditbrowser.focus();
       }
   </script>
   ENDSTDBRW
   }
   
   sub selectcourse_link {
      my ($form,$unameele,$udomele)=@_;
       return "<a href='".'javascript:opencrsbrowser("'.$form.'","'.$unameele.
           '","'.$udomele.'");'."'>".&mt('Select Course')."</a>";
   }
   
   =pod
   
   =item * linked_select_forms(...)
   
 linked_select_forms returns a string containing a <script></script> block  linked_select_forms returns a string containing a <script></script> block
 and html for two <select> menus.  The select menus will be linked in that  and html for two <select> menus.  The select menus will be linked in that
Line 201  linked_select_forms takes the following Line 399  linked_select_forms takes the following
   
 =over 4  =over 4
   
 =item $formname, the name of the <form> tag  =item * $formname, the name of the <form> tag
   
 =item $middletext, the text which appears between the <select> tags  =item * $middletext, the text which appears between the <select> tags
   
 =item $firstdefault, the default value for the first menu  =item * $firstdefault, the default value for the first menu
   
 =item $firstselectname, the name of the first <select> tag  =item * $firstselectname, the name of the first <select> tag
   
 =item $secondselectname, the name of the second <select> tag  =item * $secondselectname, the name of the second <select> tag
   
 =item $hashref, a reference to a hash containing the data for the menus.  =item * $hashref, a reference to a hash containing the data for the menus.
   
   =back 
   
 Below is an example of such a hash.  Only the 'text', 'default', and   Below is an example of such a hash.  Only the 'text', 'default', and 
 'select2' keys must appear as stated.  keys(%menu) are the possible   'select2' keys must appear as stated.  keys(%menu) are the possible 
 values for the first select menu.  The text that coincides with the   values for the first select menu.  The text that coincides with the 
 first menu values is given in $menu{$choice1}->{'text'}.  The values   first menu value is given in $menu{$choice1}->{'text'}.  The values 
 and text for the second menu are given in the hash pointed to by   and text for the second menu are given in the hash pointed to by 
 $menu{$choice1}->{'select2'}.    $menu{$choice1}->{'select2'}.  
   
  my %menu = ( A1 => { text =>"Choice A1" ,   my %menu = ( A1 => { text =>"Choice A1" ,
                       default => "B3",                         default => "B3",
                       select2 => {                          select2 => { 
                           B1 => "Choice B1",                             B1 => "Choice B1",
                           B2 => "Choice B2",                             B2 => "Choice B2",
                           B3 => "Choice B3",                             B3 => "Choice B3",
                           B4 => "Choice B4"                             B4 => "Choice B4"
                           }                             }
                   },                     },
               A2 => { text =>"Choice A2" ,                 A2 => { text =>"Choice A2" ,
                       default => "C2",                         default => "C2",
                       select2 => {                          select2 => { 
                           C1 => "Choice C1",                             C1 => "Choice C1",
                           C2 => "Choice C2",                             C2 => "Choice C2",
                           C3 => "Choice C3"                             C3 => "Choice C3"
                           }                             }
                   },                     },
               A3 => { text =>"Choice A3" ,                 A3 => { text =>"Choice A3" ,
                       default => "D6",                         default => "D6",
                       select2 => {                          select2 => { 
                           D1 => "Choice D1",                             D1 => "Choice D1",
                           D2 => "Choice D2",                             D2 => "Choice D2",
                           D3 => "Choice D3",                             D3 => "Choice D3",
                           D4 => "Choice D4",                             D4 => "Choice D4",
                           D5 => "Choice D5",                             D5 => "Choice D5",
                           D6 => "Choice D6",                             D6 => "Choice D6",
                           D7 => "Choice D7"                             D7 => "Choice D7"
                           }                             }
                   }                     }
               );                 );
   
 =back  
   
 =cut  =cut
   
 # ------------------------------------------------  
   
 sub linked_select_forms {  sub linked_select_forms {
     my ($formname,      my ($formname,
         $middletext,          $middletext,
Line 305  function select1_changed() { Line 501  function select1_changed() {
     // in with the nuclear      // in with the nuclear
     for (i=0;i<values.length; i++) {      for (i=0;i<values.length; i++) {
         $second.options[i] = new Option(values[i]);          $second.options[i] = new Option(values[i]);
           $second.options[i].value = values[i];
         $second.options[i].text = texts[i];          $second.options[i].text = texts[i];
         if (values[i] == select2def) {          if (values[i] == select2def) {
             $second.options[i].selected = true;              $second.options[i].selected = true;
Line 318  END Line 515  END
     foreach my $value (sort(keys(%$hashref))) {      foreach my $value (sort(keys(%$hashref))) {
         $result.="    <option value=\"$value\" ";          $result.="    <option value=\"$value\" ";
         $result.=" selected=\"true\" " if ($value eq $firstdefault);          $result.=" selected=\"true\" " if ($value eq $firstdefault);
         $result.=">$hashref->{$value}->{'text'}</option>\n";          $result.=">".&mt($hashref->{$value}->{'text'})."</option>\n";
     }      }
     $result .= "</select>\n";      $result .= "</select>\n";
     my %select2 = %{$hashref->{$firstdefault}->{'select2'}};      my %select2 = %{$hashref->{$firstdefault}->{'select2'}};
Line 328  END Line 525  END
     foreach my $value (sort(keys(%select2))) {      foreach my $value (sort(keys(%select2))) {
         $result.="    <option value=\"$value\" ";                  $result.="    <option value=\"$value\" ";        
         $result.=" selected=\"true\" " if ($value eq $seconddefault);          $result.=" selected=\"true\" " if ($value eq $seconddefault);
         $result.=">$select2{$value}</option>\n";          $result.=">".&mt($select2{$value})."</option>\n";
     }      }
     $result .= "</select>\n";      $result .= "</select>\n";
     #    return $debug;      #    return $debug;
     return $result;      return $result;
 }   #  end of sub linked_select_forms {  }   #  end of sub linked_select_forms {
   
   =pod
   
   =item * help_open_topic($topic, $text, $stayOnPage, $width, $height)
   
   Returns a string corresponding to an HTML link to the given help
   $topic, where $topic corresponds to the name of a .tex file in
   /home/httpd/html/adm/help/tex, with underscores replaced by
   spaces. 
   
   $text will optionally be linked to the same topic, allowing you to
   link text in addition to the graphic. If you do not want to link
   text, but wish to specify one of the later parameters, pass an
   empty string. 
   
   $stayOnPage is a value that will be interpreted as a boolean. If true,
   the link will not open a new window. If false, the link will open
   a new window using Javascript. (Default is false.) 
   
   $width and $height are optional numerical parameters that will
   override the width and height of the popped up window, which may
   be useful for certain help topics with big pictures included. 
   
   =cut
   
   sub help_open_topic {
       my ($topic, $text, $stayOnPage, $width, $height) = @_;
       $text = "" if (not defined $text);
       $stayOnPage = 0 if (not defined $stayOnPage);
       if ($ENV{'browser.interface'} eq 'textual' ||
    $ENV{'environment.remote'} eq 'off' ) {
    $stayOnPage=1;
       }
       $width = 350 if (not defined $width);
       $height = 400 if (not defined $height);
       my $filename = $topic;
       $filename =~ s/ /_/g;
   
       my $template = "";
       my $link;
   
       $topic=~s/\W/\_/g;
   
       if (!$stayOnPage)
       {
    $link = "javascript:void(open('/adm/help/${filename}.hlp', 'Help_for_$topic', 'menubar=0,toolbar=1,scrollbars=1,width=$width,height=$height,resizable=yes'))";
       }
       else
       {
    $link = "/adm/help/${filename}.hlp";
       }
   
       # Add the text
       if ($text ne "")
       {
    $template .= 
     "<table bgcolor='#3333AA' cellspacing='1' cellpadding='1' border='0'><tr>".
     "<td bgcolor='#5555FF'><a href=\"$link\"><font color='#FFFFFF' size='2'>$text</font></a>";
       }
   
       # Add the graphic
       $template .= <<"ENDTEMPLATE";
    <a href="$link"><image src="/adm/help/gif/smallHelp.gif" border="0" alt="(Help: $topic)" /></a>
   ENDTEMPLATE
       if ($text ne '') { $template.='</td></tr></table>' };
       return $template;
   
   }
   
   # This is a quicky function for Latex cheatsheet editing, since it 
   # appears in at least four places
   sub helpLatexCheatsheet {
       my $other = shift;
       my $addOther = '';
       if ($other) {
    $addOther = Apache::loncommon::help_open_topic($other, shift,
          undef, undef, 600) .
      '</td><td>';
       }
       return '<table><tr><td>'.
    $addOther .
    &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
       undef,undef,600)
    .'</td><td>'.
    &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
       undef,undef,600)
    .'</td></tr></table>';
   }
   
   =pod
   
   =item * csv_translate($text) 
   
   Translate $text to allow it to be output as a 'comma seperated values' 
   format.
   
   =cut
   
   sub csv_translate {
       my $text = shift;
       $text =~ s/\"/\"\"/g;
       $text =~ s/\n//g;
       return $text;
   }
   
   =pod
   
   =item * change_content_javascript():
   
   This and the next function allow you to create small sections of an
   otherwise static HTML page that you can update on the fly with
   Javascript, even in Netscape 4.
   
   The Javascript fragment returned by this function (no E<lt>scriptE<gt> tag)
   must be written to the HTML page once. It will prove the Javascript
   function "change(name, content)". Calling the change function with the
   name of the section 
   you want to update, matching the name passed to C<changable_area>, and
   the new content you want to put in there, will put the content into
   that area.
   
   B<Note>: Netscape 4 only reserves enough space for the changable area
   to contain room for the original contents. You need to "make space"
   for whatever changes you wish to make, and be B<sure> to check your
   code in Netscape 4. This feature in Netscape 4 is B<not> powerful;
   it's adequate for updating a one-line status display, but little more.
   This script will set the space to 100% width, so you only need to
   worry about height in Netscape 4.
   
   Modern browsers are much less limiting, and if you can commit to the
   user not using Netscape 4, this feature may be used freely with
   pretty much any HTML.
   
   =cut
   
   sub change_content_javascript {
       # If we're on Netscape 4, we need to use Layer-based code
       if ($ENV{'browser.type'} eq 'netscape' &&
    $ENV{'browser.version'} =~ /^4\./) {
    return (<<NETSCAPE4);
    function change(name, content) {
       doc = document.layers[name+"___escape"].layers[0].document;
       doc.open();
       doc.write(content);
       doc.close();
    }
   NETSCAPE4
       } else {
    # Otherwise, we need to use semi-standards-compliant code
    # (technically, "innerHTML" isn't standard but the equivalent
    # is really scary, and every useful browser supports it
    return (<<DOMBASED);
    function change(name, content) {
       element = document.getElementById(name);
       element.innerHTML = content;
    }
   DOMBASED
       }
   }
   
   =pod
   
   =item * changable_area($name, $origContent):
   
   This provides a "changable area" that can be modified on the fly via
   the Javascript code provided in C<change_content_javascript>. $name is
   the name you will use to reference the area later; do not repeat the
   same name on a given HTML page more then once. $origContent is what
   the area will originally contain, which can be left blank.
   
   =cut
   
   sub changable_area {
       my ($name, $origContent) = @_;
   
       if ($ENV{'browser.type'} eq 'netscape' &&
    $ENV{'browser.version'} =~ /^4\./) {
    # If this is netscape 4, we need to use the Layer tag
    return "<ilayer width='100%' id='${name}___escape' overflow='none'><layer width='100%' id='$name' overflow='none'>$origContent</layer></ilayer>";
       } else {
    return "<span id='$name'>$origContent</span>";
       }
   }
   
   =pod
   
   =back
   
   =cut
   
 ###############################################################  ###############################################################
 ##        Home server <option> list generating code          ##  ##        Home server <option> list generating code          ##
 ###############################################################  ###############################################################
 #-------------------------------------------  
   
 =item get_domains()  =pod
   
   =head1 Home Server option list generating code
   
   =over 4
   
   =item * get_domains()
   
 Returns an array containing each of the domains listed in the hosts.tab  Returns an array containing each of the domains listed in the hosts.tab
 file.  file.
Line 353  sub get_domains { Line 744  sub get_domains {
     my @domains;      my @domains;
     my %seen;      my %seen;
     foreach (sort values(%Apache::lonnet::hostdom)) {      foreach (sort values(%Apache::lonnet::hostdom)) {
         push (@domains,$_) unless $seen{$_}++;   push (@domains,$_) unless $seen{$_}++;
     }      }
     return @domains;      return @domains;
 }  }
   
   # ------------------------------------------
   
   sub domain_select {
       my ($name,$value,$multiple)=@_;
       my %domains=map { 
    $_ => $_.' '.$Apache::lonnet::domaindescription{$_} 
       } &get_domains;
       if ($multiple) {
    $domains{''}=&mt('Any domain');
    return &multiple_select_form($name,$value,%domains);
       } else {
    return &select_form($name,$value,%domains);
       }
   }
   
   sub multiple_select_form {
       my ($name,$value,%hash)=@_;
       my %selected = map { $_ => 1 } ref($value)?@{$value}:($value);
       my $output='';
       my $size =(scalar keys %hash<4?scalar keys %hash:4);
       $output.="\n<select name='$name' size='$size' multiple='1'>";
       foreach (sort keys %hash) {
           $output.="<option name='$_'".
               ($selected{$_}?' selected="1"' :'').">$hash{$_}</option>\n";
       }
       $output.="</select>\n";
       return $output;
   }
   
 #-------------------------------------------  #-------------------------------------------
   
 =item select_dom_form($defdom,$name)  =pod
   
   =item * select_form($defdom,$name,%hash)
   
   Returns a string containing a <select name='$name' size='1'> form to 
   allow a user to select options from a hash option_name => displayed text.  
   See lonrights.pm for an example invocation and use.
   
   =cut
   
   #-------------------------------------------
   sub select_form {
       my ($def,$name,%hash) = @_;
       my $selectform = "<select name=\"$name\" size=\"1\">\n";
       my @keys;
       if (exists($hash{'select_form_order'})) {
    @keys=@{$hash{'select_form_order'}};
       } else {
    @keys=sort(keys(%hash));
       }
       foreach (@keys) {
           $selectform.="<option value=\"$_\" ".
               ($_ eq $def ? 'selected' : '').
                   ">".&mt($hash{$_})."</option>\n";
       }
       $selectform.="</select>";
       return $selectform;
   }
   
   sub gradeleveldescription {
       my $gradelevel=shift;
       my %gradelevels=(0 => 'Not specified',
        1 => 'Grade 1',
        2 => 'Grade 2',
        3 => 'Grade 3',
        4 => 'Grade 4',
        5 => 'Grade 5',
        6 => 'Grade 6',
        7 => 'Grade 7',
        8 => 'Grade 8',
        9 => 'Grade 9',
        10 => 'Grade 10',
        11 => 'Grade 11',
        12 => 'Grade 12',
        13 => 'Grade 13',
        14 => '100 Level',
        15 => '200 Level',
        16 => '300 Level',
        17 => '400 Level',
        18 => 'Graduate Level');
       return &mt($gradelevels{$gradelevel});
   }
   
   sub select_level_form {
       my ($deflevel,$name)=@_;
       unless ($deflevel) { $deflevel=0; }
       my $selectform = "<select name=\"$name\" size=\"1\">\n";
       for (my $i=0; $i<=18; $i++) {
           $selectform.="<option value=\"$i\" ".
               ($i==$deflevel ? 'selected' : '').
                   ">".&gradeleveldescription($i)."</option>\n";
       }
       $selectform.="</select>";
       return $selectform;
   }
   
   #-------------------------------------------
   
   =pod
   
   =item * select_dom_form($defdom,$name,$includeempty)
   
 Returns a string containing a <select name='$name' size='1'> form to   Returns a string containing a <select name='$name' size='1'> form to 
 allow a user to select the domain to preform an operation in.    allow a user to select the domain to preform an operation in.  
 See loncreateuser.pm for an example invocation and use.  See loncreateuser.pm for an example invocation and use.
   
   If the $includeempty flag is set, it also includes an empty choice ("no domain
   selected");
   
 =cut  =cut
   
 #-------------------------------------------  #-------------------------------------------
 sub select_dom_form {  sub select_dom_form {
     my ($defdom,$name) = @_;      my ($defdom,$name,$includeempty) = @_;
     my @domains = get_domains();      my @domains = get_domains();
       if ($includeempty) { @domains=('',@domains); }
     my $selectdomain = "<select name=\"$name\" size=\"1\">\n";      my $selectdomain = "<select name=\"$name\" size=\"1\">\n";
     foreach (@domains) {      foreach (@domains) {
         $selectdomain.="<option value=\"$_\" ".          $selectdomain.="<option value=\"$_\" ".
Line 384  sub select_dom_form { Line 878  sub select_dom_form {
   
 #-------------------------------------------  #-------------------------------------------
   
 =item get_home_servers($domain)  =pod
   
   =item * get_library_servers($domain)
   
 Returns a hash which contains keys like '103l3' and values like   Returns a hash which contains keys like '103l3' and values like 
 'kirk.lite.msu.edu'.  All of the keys will be for machines in the  'kirk.lite.msu.edu'.  All of the keys will be for machines in the
Line 393  given $domain. Line 889  given $domain.
 =cut  =cut
   
 #-------------------------------------------  #-------------------------------------------
 sub get_home_servers {  sub get_library_servers {
     my $domain = shift;      my $domain = shift;
     my %home_servers;      my %library_servers;
     foreach (keys(%Apache::lonnet::libserv)) {      foreach (keys(%Apache::lonnet::libserv)) {
         if ($Apache::lonnet::hostdom{$_} eq $domain) {          if ($Apache::lonnet::hostdom{$_} eq $domain) {
             $home_servers{$_} = $Apache::lonnet::hostname{$_};              $library_servers{$_} = $Apache::lonnet::hostname{$_};
         }          }
     }      }
     return %home_servers;      return %library_servers;
 }  }
   
 #-------------------------------------------  #-------------------------------------------
   
 =item home_server_option_list($domain)  =pod
   
   =item * home_server_option_list($domain)
   
 returns a string which contains an <option> list to be used in a   returns a string which contains an <option> list to be used in a 
 <select> form input.  See loncreateuser.pm for an example.  <select> form input.  See loncreateuser.pm for an example.
Line 416  returns a string which contains an <opti Line 914  returns a string which contains an <opti
 #-------------------------------------------  #-------------------------------------------
 sub home_server_option_list {  sub home_server_option_list {
     my $domain = shift;      my $domain = shift;
     my %servers = &get_home_servers($domain);      my %servers = &get_library_servers($domain);
     my $result = '';      my $result = '';
     foreach (sort keys(%servers)) {      foreach (sort keys(%servers)) {
         $result.=          $result.=
Line 424  sub home_server_option_list { Line 922  sub home_server_option_list {
     }      }
     return $result;      return $result;
 }  }
   
   =pod
   
   =back
   
   =cut
   
 ###############################################################  ###############################################################
 ##    End of home server <option> list generating code       ##  ##                  Decoding User Agent                      ##
 ###############################################################  ###############################################################
   
   =pod
   
   =head1 Decoding the User Agent
   
   =over 4
   
   =item * &decode_user_agent()
   
   Inputs: $r
   
   Outputs:
   
   =over 4
   
   =item * $httpbrowser
   
   =item * $clientbrowser
   
   =item * $clientversion
   
   =item * $clientmathml
   
   =item * $clientunicode
   
   =item * $clientos
   
   =back
   
   =back 
   
   =cut
   
   ###############################################################
   ###############################################################
   sub decode_user_agent {
       my @browsertype=split(/\&/,$Apache::lonnet::perlvar{"lonBrowsDet"});
       my %mathcap=split(/\&/,$$Apache::lonnet::perlvar{"lonMathML"});
       my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
       my $clientbrowser='unknown';
       my $clientversion='0';
       my $clientmathml='';
       my $clientunicode='0';
       for (my $i=0;$i<=$#browsertype;$i++) {
           my ($bname,$match,$notmatch,$vreg,$minv,$univ)=split(/\:/,$browsertype[$i]);
    if (($httpbrowser=~/$match/i)  && ($httpbrowser!~/$notmatch/i)) {
       $clientbrowser=$bname;
               $httpbrowser=~/$vreg/i;
       $clientversion=$1;
               $clientmathml=($clientversion>=$minv);
               $clientunicode=($clientversion>=$univ);
    }
       }
       my $clientos='unknown';
       if (($httpbrowser=~/linux/i) ||
           ($httpbrowser=~/unix/i) ||
           ($httpbrowser=~/ux/i) ||
           ($httpbrowser=~/solaris/i)) { $clientos='unix'; }
       if (($httpbrowser=~/vax/i) ||
           ($httpbrowser=~/vms/i)) { $clientos='vms'; }
       if ($httpbrowser=~/next/i) { $clientos='next'; }
       if (($httpbrowser=~/mac/i) ||
           ($httpbrowser=~/powerpc/i)) { $clientos='mac'; }
       if ($httpbrowser=~/win/i) { $clientos='win'; }
       if ($httpbrowser=~/embed/i) { $clientos='pda'; }
       return ($httpbrowser,$clientbrowser,$clientversion,$clientmathml,
               $clientunicode,$clientos,);
   }
   
 ###############################################################  ###############################################################
 ##    Authentication changing form generation subroutines    ##  ##    Authentication changing form generation subroutines    ##
 ###############################################################  ###############################################################
Line 438  sub home_server_option_list { Line 1011  sub home_server_option_list {
 ##    formname = the name given in the <form> tag.  ##    formname = the name given in the <form> tag.
 #-------------------------------------------  #-------------------------------------------
   
 =item authform_xxxxxx  =pod
   
   =head1 Authentication Routines
   
   =over 4
   
   =item * authform_xxxxxx
   
 The authform_xxxxxx subroutines provide javascript and html forms which   The authform_xxxxxx subroutines provide javascript and html forms which 
 handle some of the conveniences required for authentication forms.    handle some of the conveniences required for authentication forms.  
Line 448  See loncreateuser.pm for invocation and Line 1027  See loncreateuser.pm for invocation and
   
 =over 4  =over 4
   
 =item authform_header  =item * authform_header
   
 =item authform_authorwarning  =item * authform_authorwarning
   
 =item authform_nochange  =item * authform_nochange
   
 =item authform_kerberos  =item * authform_kerberos
   
 =item authform_internal  =item * authform_internal
   
 =item authform_filesystem  =item * authform_filesystem
   
 =back  =back
   
   =back 
   
 =cut  =cut
   
 #-------------------------------------------  #-------------------------------------------
 sub authform_header{    sub authform_header{  
     my %in = (      my %in = (
         formname => 'cu',          formname => 'cu',
         kerb_def_dom => 'MSU.EDU',          kerb_def_dom => '',
         @_,          @_,
     );      );
     $in{'formname'} = 'document.' . $in{'formname'};      $in{'formname'} = 'document.' . $in{'formname'};
     my $result='';      my $result='';
   
   #---------------------------------------------- Code for upper case translation
       my $Javascript_toUpperCase;
       unless ($in{kerb_def_dom}) {
           $Javascript_toUpperCase =<<"END";
           switch (choice) {
              case 'krb': currentform.elements[choicearg].value =
                  currentform.elements[choicearg].value.toUpperCase();
                  break;
              default:
           }
   END
       } else {
           $Javascript_toUpperCase = "";
       }
   
       my $radioval = "'nochange'";
       my $argfield = 'null';
       if ( grep/^mode$/,(keys %in) ) {
           if ($in{'mode'} eq 'modifycourse')  {
               if ( grep/^curr_authtype$/,(keys %in) ) {
                   $radioval = "'$in{'curr_authtype'}'";
               }
               if ( grep/^curr_autharg$/,(keys %in) ) {
                   unless ($in{'curr_autharg'} eq '') {
                       $argfield = "'$in{'curr_autharg'}'";
                   }
               }
           }
       }
   
     $result.=<<"END";      $result.=<<"END";
 var current = new Object();  var current = new Object();
 current.radiovalue = 'nochange';  current.radiovalue = $radioval;
 current.argfield = null;  current.argfield = $argfield;
   
 function changed_radio(choice,currentform) {  function changed_radio(choice,currentform) {
     var choicearg = choice + 'arg';      var choicearg = choice + 'arg';
Line 506  function changed_radio(choice,currentfor Line 1118  function changed_radio(choice,currentfor
 function changed_text(choice,currentform) {  function changed_text(choice,currentform) {
     var choicearg = choice + 'arg';      var choicearg = choice + 'arg';
     if (currentform.elements[choicearg].value !='') {      if (currentform.elements[choicearg].value !='') {
         switch (choice) {          $Javascript_toUpperCase
             case 'krb': currentform.elements[choicearg].value =  
                 currentform.elements[choicearg].value.toUpperCase();  
                 break;  
             default:  
         }  
         // clear old field          // clear old field
         if ((current.argfield != choicearg) && (current.argfield != null)) {          if ((current.argfield != choicearg) && (current.argfield != null)) {
             currentform.elements[current.argfield].value = '';              currentform.elements[current.argfield].value = '';
Line 541  END Line 1148  END
   
 sub authform_authorwarning{  sub authform_authorwarning{
     my $result='';      my $result='';
     $result=<<"END";      $result='<i>'.
 <i>As a general rule, only authors or co-authors should be filesystem          &mt('As a general rule, only authors or co-authors should be '.
 authenticated (which allows access to the server filesystem).</i>              'filesystem authenticated '.
 END              '(which allows access to the server filesystem).')."</i>\n";
     return $result;      return $result;
 }  }
   
Line 554  sub authform_nochange{ Line 1161  sub authform_nochange{
               kerb_def_dom => 'MSU.EDU',                kerb_def_dom => 'MSU.EDU',
               @_,                @_,
           );            );
     my $result='';      my $result = &mt('[_1] Do not change login data',
     $result.=<<"END";                       '<input type="radio" name="login" value="nochange" '.
 <input type="radio" name="login" value="nochange" checked="checked"                       'checked="checked" onclick="'.
        onclick="javascript:changed_radio('nochange',$in{'formname'});">              "javascript:changed_radio('nochange',$in{'formname'});".'" />');
 Do not change login data  
 END  
     return $result;      return $result;
 }  }
   
Line 567  sub authform_kerberos{ Line 1172  sub authform_kerberos{
     my %in = (      my %in = (
               formname => 'document.cu',                formname => 'document.cu',
               kerb_def_dom => 'MSU.EDU',                kerb_def_dom => 'MSU.EDU',
                 kerb_def_auth => 'krb4',
               @_,                @_,
               );                );
     my $result='';      my ($check4,$check5,$krbarg);
     $result.=<<"END";      if ($in{'kerb_def_auth'} eq 'krb5') {
 <input type="radio" name="login" value="krb"          $check5 = " checked=\"on\"";
        onclick="javascript:changed_radio('krb',$in{'formname'});"      } else {
        onchange="javascript:changed_radio('krb',$in{'formname'});">         $check4 = " checked=\"on\"";
 Kerberos authenticated with domain      }
 <input type="text" size="10" name="krbarg" value=""      $krbarg = $in{'kerb_def_dom'};
        onchange="javascript:changed_text('krb',$in{'formname'});">  
 END      my $krbcheck = "";
       if ( grep/^curr_authtype$/,(keys %in) ) {
           if ($in{'curr_authtype'} =~ m/^krb/) {
               $krbcheck = " checked=\"on\"";
               if ( grep/^curr_autharg$/,(keys %in) ) {
                   $krbarg = $in{'curr_autharg'};
               }
           }
       }
   
       my $jscall = "javascript:changed_radio('krb',$in{'formname'});";
       my $result .= &mt
           ('[_1] Kerberos authenticated with domain [_2] '.
            '[_3] Version 4 [_4] Version 5',
            '<input type="radio" name="login" value="krb" '.
                'onclick="'.$jscall.'" onchange="'.$jscall.'"'.$krbcheck.' />',
            '<input type="text" size="10" name="krbarg" '.
                'value="'.$krbarg.'" '.
                'onchange="'.$jscall.'" />',
            '<input type="radio" name="krbver" value="4" '.$check4.' />',
            '<input type="radio" name="krbver" value="5" '.$check5.' />');
     return $result;      return $result;
 }  }
   
Line 587  sub authform_internal{ Line 1213  sub authform_internal{
                 kerb_def_dom => 'MSU.EDU',                  kerb_def_dom => 'MSU.EDU',
                 @_,                  @_,
                 );                  );
     my $result='';  
     $result.=<<"END";      my $intcheck = "";
 <input type="radio" name="login" value="int"      my $intarg = 'value=""';
        onchange="javascript:changed_radio('int',$args{'formname'});"      if ( grep/^curr_authtype$/,(keys %args) ) {
        onclick="javascript:changed_radio('int',$args{'formname'});">          if ($args{'curr_authtype'} eq 'int') {
 Internally authenticated (with initial password               $intcheck = " checked=\"on\"";
 <input type="text" size="10" name="intarg" value=""              if ( grep/^curr_autharg$/,(keys %args) ) {
        onchange="javascript:changed_text('int',$args{'formname'});">                  $intarg = "value=\"$args{'curr_autharg'}\"";
 END              }
           }
       }
   
       my $jscall = "javascript:changed_radio('int',$args{'formname'});";
       my $result.=&mt
           ('[_1] Internally authenticated (with initial password [_2])',
            '<input type="radio" name="login" value="int" '.$intcheck.
                ' onchange="'.$jscall.'" onclick="'.$jscall.'" />',
            '<input type="text" size="10" name="intarg" '.$intarg.
                ' onchange="'.$jscall.'" />');
     return $result;      return $result;
 }  }
   
Line 605  sub authform_local{ Line 1241  sub authform_local{
               kerb_def_dom => 'MSU.EDU',                kerb_def_dom => 'MSU.EDU',
               @_,                @_,
               );                );
     my $result='';  
     $result.=<<"END";      my $loccheck = "";
 <input type="radio" name="login" value="loc"      my $locarg = 'value=""';
        onchange="javascript:changed_radio('loc',$in{'formname'});"      if ( grep/^curr_authtype$/,(keys %in) ) {
        onclick="javascript:changed_radio('loc',$in{'formname'});">           if ($in{'curr_authtype'} eq 'loc') {
 Local Authentication with argument              $loccheck = " checked=\"on\"";
 <input type="text" size="10" name="locarg" value=""              if ( grep/^curr_autharg$/,(keys %in) ) {
        onchange="javascript:changed_text('loc',$in{'formname'});">                  $locarg = "value=\"$in{'curr_autharg'}\"";
 END              }
           }
       }
   
       my $jscall = "javascript:changed_radio('loc',$in{'formname'});";
       my $result.=&mt('[_1] Local Authentication with argument [_2]',
                       '<input type="radio" name="login" value="loc" '.$loccheck.
                           ' onchange="'.$jscall.'" onclick="'.$jscall.'" />',
                       '<input type="text" size="10" name="locarg" '.$locarg.
                           ' onchange="'.$jscall.'" />');
     return $result;      return $result;
 }  }
   
Line 623  sub authform_filesystem{ Line 1268  sub authform_filesystem{
               kerb_def_dom => 'MSU.EDU',                kerb_def_dom => 'MSU.EDU',
               @_,                @_,
               );                );
     my $result='';      my $jscall = "javascript:changed_radio('fsys',$in{'formname'});";
     $result.=<<"END";      my $result.= &mt
 <input type="radio" name="login" value="fsys"           ('[_1] Filesystem Authenticated (with initial password [_2])',
        onchange="javascript:changed_radio('fsys',$in{'formname'});"           '<input type="radio" name="login" value="fsys" '.
        onclick="javascript:changed_radio('fsys',$in{'formname'});">            'onchange="'.$jscall.'" onclick="'.$jscall.'" />',
 Filesystem authenticated (with initial password            '<input type="text" size="10" name="fsysarg" value="" '.
 <input type="text" size="10" name="fsysarg" value=""                    'onchange="'.$jscall.'" />');
        onchange="javascript:changed_text('fsys',$in{'formname'});">  
 END  
     return $result;      return $result;
 }  }
   
 ###############################################################  ###############################################################
 ##   End Authentication changing form generation functions   ##  ##    Get Authentication Defaults for Domain                 ##
   ###############################################################
   
   =pod
   
   =head1 Domains and Authentication
   
   Returns default authentication type and an associated argument as
   listed in file 'domain.tab'.
   
   =over 4
   
   =item * get_auth_defaults
   
   get_auth_defaults($target_domain) returns the default authentication
   type and an associated argument (initial password or a kerberos domain).
   These values are stored in lonTabs/domain.tab
   
   ($def_auth, $def_arg) = &get_auth_defaults($target_domain);
   
   If target_domain is not found in domain.tab, returns nothing ('').
   
   =cut
   
   #-------------------------------------------
   sub get_auth_defaults {
       my $domain=shift;
       return ($Apache::lonnet::domain_auth_def{$domain},$Apache::lonnet::domain_auth_arg_def{$domain});
   }
   ###############################################################
   ##   End Get Authentication Defaults for Domain              ##
   ###############################################################
   
   ###############################################################
   ##    Get Kerberos Defaults for Domain                 ##
   ###############################################################
   ##
   ## Returns default kerberos version and an associated argument
   ## as listed in file domain.tab. If not listed, provides
   ## appropriate default domain and kerberos version.
   ##
   #-------------------------------------------
   
   =pod
   
   =item * get_kerberos_defaults
   
   get_kerberos_defaults($target_domain) returns the default kerberos
   version and domain. If not found in domain.tabs, it defaults to
   version 4 and the domain of the server.
   
   ($def_version, $def_krb_domain) = &get_kerberos_defaults($target_domain);
   
   =cut
   
   #-------------------------------------------
   sub get_kerberos_defaults {
       my $domain=shift;
       my ($krbdef,$krbdefdom) =
           &Apache::loncommon::get_auth_defaults($domain);
       unless ($krbdef =~/^krb/ && $krbdefdom) {
           $ENV{'SERVER_NAME'}=~/(\w+\.\w+)$/;
           my $krbdefdom=$1;
           $krbdefdom=~tr/a-z/A-Z/;
           $krbdef = "krb4";
       }
       return ($krbdef,$krbdefdom);
   }
   
   =pod
   
   =back
   
   =cut
   
   ###############################################################
   ##                Thesaurus Functions                        ##
 ###############################################################  ###############################################################
   
   =pod
   
   =head1 Thesaurus Functions
   
   =over 4
   
   =item * initialize_keywords
   
 # ---------------------------------------------------------- Is this a keyword?  Initializes the package variable %Keywords if it is empty.  Uses the
   package variable $thesaurus_db_file.
   
   =cut
   
   ###################################################
   
   sub initialize_keywords {
       return 1 if (scalar keys(%Keywords));
       # If we are here, %Keywords is empty, so fill it up
       #   Make sure the file we need exists...
       if (! -e $thesaurus_db_file) {
           &Apache::lonnet::logthis("Attempt to access $thesaurus_db_file".
                                    " failed because it does not exist");
           return 0;
       }
       #   Set up the hash as a database
       my %thesaurus_db;
       if (! tie(%thesaurus_db,'GDBM_File',
                 $thesaurus_db_file,&GDBM_READER(),0640)){
           &Apache::lonnet::logthis("Could not tie \%thesaurus_db to ".
                                    $thesaurus_db_file);
           return 0;
       } 
       #  Get the average number of appearances of a word.
       my $avecount = $thesaurus_db{'average.count'};
       #  Put keywords (those that appear > average) into %Keywords
       while (my ($word,$data)=each (%thesaurus_db)) {
           my ($count,undef) = split /:/,$data;
           $Keywords{$word}++ if ($count > $avecount);
       }
       untie %thesaurus_db;
       # Remove special values from %Keywords.
       foreach ('total.count','average.count') {
           delete($Keywords{$_}) if (exists($Keywords{$_}));
       }
       return 1;
   }
   
   ###################################################
   
   =pod
   
   =item * keyword($word)
   
   Returns true if $word is a keyword.  A keyword is a word that appears more 
   than the average number of times in the thesaurus database.  Calls 
   &initialize_keywords
   
   =cut
   
   ###################################################
   
 sub keyword {  sub keyword {
     my $newword=shift;      return if (!&initialize_keywords());
     $newword=~s/\W//g;      my $word=lc(shift());
     $newword=~tr/A-Z/a-z/;      $word=~s/\W//g;
     my $tindex=$theindex{$newword};      return exists($Keywords{$word});
     if ($tindex) {  }
         if ($thecount[$tindex]>$theavecount) {  
            return 1;  ###############################################################
         }  
     }  =pod 
     return 0;  
 }  =item * get_related_words
 # -------------------------------------------------------- Return related words  
   Look up a word in the thesaurus.  Takes a scalar argument and returns
 sub related {  an array of words.  If the keyword is not in the thesaurus, an empty array
     my $newword=shift;  will be returned.  The order of the words returned is determined by the
     $newword=~s/\W//g;  database which holds them.
     $newword=~tr/A-Z/a-z/;  
     my $tindex=$theindex{$newword};  Uses global $thesaurus_db_file.
     if ($tindex) {  
         my %found=();  =cut
         foreach (split(/\,/,$therelated[$tindex])) {  
 # - Related word found  ###############################################################
             my ($ridx,$rcount)=split(/\:/,$_);  sub get_related_words {
 # - Direct relation index      my $keyword = shift;
             my $directrel=$rcount/$thecount[$tindex];      my %thesaurus_db;
             if ($directrel>$thethreshold) {      if (! -e $thesaurus_db_file) {
                foreach (split(/\,/,$therelated[$ridx])) {          &Apache::lonnet::logthis("Attempt to access $thesaurus_db_file ".
                   my ($rridx,$rrcount)=split(/\:/,$_);                                   "failed because the file does not exist");
                   if ($rridx==$tindex) {          return ();
 # - Determine reverse relation index      }
                      my $revrel=$rrcount/$thecount[$ridx];      if (! tie(%thesaurus_db,'GDBM_File',
 # - Calculate full index                $thesaurus_db_file,&GDBM_READER(),0640)){
                      $found{$ridx}=$directrel*$revrel;          return ();
                      if ($found{$ridx}>$thethreshold) {      } 
                         foreach (split(/\,/,$therelated[$ridx])) {      my @Words=();
                             my ($rrridx,$rrrcount)=split(/\:/,$_);      if (exists($thesaurus_db{$keyword})) {
                             unless ($found{$rrridx}) {          $_ = $thesaurus_db{$keyword};
                                my $revrevrel=$rrrcount/$thecount[$ridx];          (undef,@Words) = split/:/;  # The first element is the number of times
                                if (                                      # the word appears.  We do not need it now.
                           $directrel*$revrel*$revrevrel>$thethreshold          for (my $i=0;$i<=$#Words;$i++) {
                                ) {              ($Words[$i],undef)= split/\,/,$Words[$i];
                                   $found{$rrridx}=  
                                        $directrel*$revrel*$revrevrel;  
                                }  
                             }  
                         }  
                      }  
                   }  
                }  
             }  
         }          }
     }      }
     return ();      untie %thesaurus_db;
       return @Words;
   }
   
   =pod
   
   =back
   
   =cut
   
   # -------------------------------------------------------------- Plaintext name
   =pod
   
   =head1 User Name Functions
   
   =over 4
   
   =item * plainname($uname,$udom)
   
   Takes a users logon name and returns it as a string in
   "first middle last generation" form
   
   =cut
   
   ###############################################################
   sub plainname {
       my ($uname,$udom)=@_;
       my %names=&Apache::lonnet::get('environment',
                       ['firstname','middlename','lastname','generation'],
    $udom,$uname);
       my $name=$names{'firstname'}.' '.$names{'middlename'}.' '.
    $names{'lastname'}.' '.$names{'generation'};
       $name=~s/\s+$//;
       $name=~s/\s+/ /g;
       return $name;
   }
   
   # -------------------------------------------------------------------- Nickname
   =pod
   
   =item * nickname($uname,$udom)
   
   Gets a users name and returns it as a string as
   
   "&quot;nickname&quot;"
   
   if the user has a nickname or
   
   "first middle last generation"
   
   if the user does not
   
   =cut
   
   sub nickname {
       my ($uname,$udom)=@_;
       my %names=&Apache::lonnet::get('environment',
     ['nickname','firstname','middlename','lastname','generation'],$udom,$uname);
       my $name=$names{'nickname'};
       if ($name) {
          $name='&quot;'.$name.'&quot;'; 
       } else {
          $name=$names{'firstname'}.' '.$names{'middlename'}.' '.
        $names{'lastname'}.' '.$names{'generation'};
          $name=~s/\s+$//;
          $name=~s/\s+/ /g;
       }
       return $name;
 }  }
   
 # ---------------------------------------------------------------- Language IDs  
   # ------------------------------------------------------------------ Screenname
   
   =pod
   
   =item * screenname($uname,$udom)
   
   Gets a users screenname and returns it as a string
   
   =cut
   
   sub screenname {
       my ($uname,$udom)=@_;
       my %names=
    &Apache::lonnet::get('environment',['screenname'],$udom,$uname);
       return $names{'screenname'};
   }
   
   # ------------------------------------------------------------- Message Wrapper
   
   sub messagewrapper {
       my ($link,$un,$do)=@_;
       return 
   "<a href='/adm/email?compose=individual&recname=$un&recdom=$do'>$link</a>";
   }
   # --------------------------------------------------------------- Notes Wrapper
   
   sub noteswrapper {
       my ($link,$un,$do)=@_;
       return 
   "<a href='/adm/email?recordftf=retrieve&recname=$un&recdom=$do'>$link</a>";
   }
   # ------------------------------------------------------------- Aboutme Wrapper
   
   sub aboutmewrapper {
       my ($link,$username,$domain,$target)=@_;
       return "<a href='/adm/$domain/$username/aboutme'".
    ($target?" target='$target'":'').">$link</a>";
   }
   
   # ------------------------------------------------------------ Syllabus Wrapper
   
   
   sub syllabuswrapper {
       my ($linktext,$coursedir,$domain,$fontcolor)=@_;
       if ($fontcolor) { 
           $linktext='<font color="'.$fontcolor.'">'.$linktext.'</font>'; 
       }
       return "<a href='/public/$domain/$coursedir/syllabus'>$linktext</a>";
   }
   
   =pod
   
   =back
   
   =head1 Access .tab File Data
   
   =over 4
   
   =item * languageids() 
   
   returns list of all language ids
   
   =cut
   
 sub languageids {  sub languageids {
     return sort(keys(%language));      return sort(keys(%language));
 }  }
   
 # -------------------------------------------------------- Language Description  =pod
   
   =item * languagedescription() 
   
   returns description of a specified language id
   
   =cut
   
 sub languagedescription {  sub languagedescription {
     return $language{shift(@_)};      my $code=shift;
       return  ($supported_language{$code}?'* ':'').
               $language{$code}.
       ($supported_language{$code}?' ('.&mt('interface available').')':'');
   }
   
   sub plainlanguagedescription {
       my $code=shift;
       return $language{$code};
 }  }
   
 # --------------------------------------------------------------- Copyright IDs  sub supportedlanguagecode {
       my $code=shift;
       return $supported_language{$code};
   }
   
   =pod
   
   =item * copyrightids() 
   
   returns list of all copyrights
   
   =cut
   
 sub copyrightids {  sub copyrightids {
     return sort(keys(%cprtag));      return sort(keys(%cprtag));
 }  }
   
 # ------------------------------------------------------- Copyright Description  =pod
   
   =item * copyrightdescription() 
   
   returns description of a specified copyright id
   
   =cut
   
 sub copyrightdescription {  sub copyrightdescription {
     return $cprtag{shift(@_)};      return &mt($cprtag{shift(@_)});
 }  }
   
 # ------------------------------------------------------------- File Categories  =pod
   
   =item * filecategories() 
   
   returns list of all file categories
   
   =cut
   
 sub filecategories {  sub filecategories {
     return sort(keys(%fc));      return sort(keys(%category_extensions));
 }  }
   
 # -------------------------------------- File Types within a specified category  =pod
   
   =item * filecategorytypes() 
   
   returns list of file types belonging to a given file
   category
   
   =cut
   
 sub filecategorytypes {  sub filecategorytypes {
     return @{$fc{lc(shift(@_))}};      return @{$category_extensions{lc($_[0])}};
 }  }
   
 # ------------------------------------------------------------------ File Types  =pod
 sub fileextensions {  
     return sort(keys(%fe));  =item * fileembstyle() 
 }  
   returns embedding style for a specified file type
   
   =cut
   
 # ------------------------------------------------------------- Embedding Style  
 sub fileembstyle {  sub fileembstyle {
     return $fe{lc(shift(@_))};      return $fe{lc(shift(@_))};
 }  }
   
 # ------------------------------------------------------------ Description Text  
   sub filecategoryselect {
       my ($name,$value)=@_;
       return &select_form($name,$value,
    '' => &mt('Any category'),
    map { $_,$_ } sort(keys(%category_extensions)));
   }
   
   =pod
   
   =item * filedescription() 
   
   returns description for a specified file type
   
   =cut
   
 sub filedescription {  sub filedescription {
     return $fd{lc(shift(@_))};      return &mt($fd{lc(shift(@_))});
 }  }
   
 # ------------------------------------------------------------ Description Text  =pod
   
   =item * filedescriptionex() 
   
   returns description for a specified file type with
   extra formatting
   
   =cut
   
 sub filedescriptionex {  sub filedescriptionex {
     my $ex=shift;      my $ex=shift;
     return '.'.$ex.' '.$fd{lc($ex)};      return '.'.$ex.' '.&mt($fd{lc($ex)});
   }
   
   # End of .tab access
   =pod
   
   =back
   
   =cut
   
   # ------------------------------------------------------------------ File Types
   sub fileextensions {
       return sort(keys(%fe));
   }
   
   # ----------------------------------------------------------- Display Languages
   # returns a hash with all desired display languages
   #
   
   sub display_languages {
       my %languages=();
       foreach (&preferred_languages()) {
    $languages{$_}=1;
       }
       &get_unprocessed_cgi($ENV{'QUERY_STRING'},['displaylanguage']);
       if ($ENV{'form.displaylanguage'}) {
    foreach (split(/\s*(\,|\;|\:)\s*/,$ENV{'form.displaylanguage'})) {
       $languages{$_}=1;
           }
       }
       return %languages;
 }  }
   
   sub preferred_languages {
       my @languages=();
       if ($ENV{'environment.languages'}) {
    @languages=split(/\s*(\,|\;|\:)\s*/,$ENV{'environment.languages'});
       }
       if ($ENV{'course.'.$ENV{'request.course.id'}.'.languages'}) {
    @languages=(@languages,split(/\s*(\,|\;|\:)\s*/,
            $ENV{'course.'.$ENV{'request.course.id'}.'.languages'}));
       }
       my $browser=(split(/\;/,$ENV{'HTTP_ACCEPT_LANGUAGE'}))[0];
       if ($browser) {
    @languages=(@languages,split(/\s*(\,|\;|\:)\s*/,$browser));
       }
       if ($Apache::lonnet::domain_lang_def{$ENV{'user.domain'}}) {
    @languages=(@languages,
    $Apache::lonnet::domain_lang_def{$ENV{'user.domain'}});
       }
       if ($Apache::lonnet::domain_lang_def{$ENV{'request.role.domain'}}) {
    @languages=(@languages,
    $Apache::lonnet::domain_lang_def{$ENV{'request.role.domain'}});
       }
       if ($Apache::lonnet::domain_lang_def{
                             $Apache::lonnet::perlvar{'lonDefDomain'}}) {
    @languages=(@languages,
    $Apache::lonnet::domain_lang_def{
                                     $Apache::lonnet::perlvar{'lonDefDomain'}});
       }
   # turn "en-ca" into "en-ca,en"
       my @genlanguages;
       foreach (@languages) {
    unless ($_=~/\w/) { next; }
    push (@genlanguages,$_);
    if ($_=~/(\-|\_)/) {
       push (@genlanguages,(split(/(\-|\_)/,$_))[0]);
    }
       }
       return @genlanguages;
   }
   
   ###############################################################
   ##               Student Answer Attempts                     ##
   ###############################################################
   
   =pod
   
   =head1 Alternate Problem Views
   
   =over 4
   
   =item * get_previous_attempt($symb, $username, $domain, $course,
       $getattempt, $regexp, $gradesub)
   
   Return string with previous attempt on problem. Arguments:
   
   =over 4
   
   =item * $symb: Problem, including path
   
   =item * $username: username of the desired student
   
   =item * $domain: domain of the desired student
   
   =item * $course: Course ID
   
   =item * $getattempt: Leave blank for all attempts, otherwise put
       something
   
   =item * $regexp: if string matches this regexp, the string will be
       sent to $gradesub
   
   =item * $gradesub: routine that processes the string if it matches $regexp
   
   =back
   
   The output string is a table containing all desired attempts, if any.
   
   =cut
   
 sub get_previous_attempt {  sub get_previous_attempt {
   my ($symb,$username,$domain,$course)=@_;    my ($symb,$username,$domain,$course,$getattempt,$regexp,$gradesub)=@_;
   my $prevattempts='';    my $prevattempts='';
     no strict 'refs';
   if ($symb) {    if ($symb) {
     my (%returnhash)=      my (%returnhash)=
       &Apache::lonnet::restore($symb,$course,$domain,$username);        &Apache::lonnet::restore($symb,$course,$domain,$username);
Line 764  sub get_previous_attempt { Line 1845  sub get_previous_attempt {
   $lasthash{$_}=$returnhash{$version.':'.$_};    $lasthash{$_}=$returnhash{$version.':'.$_};
         }          }
       }        }
       $prevattempts='<table border=2></tr><th>History</th>';        $prevattempts='<table border="0" width="100%"><tr><td bgcolor="#777777">';
         $prevattempts.='<table border="0" width="100%"><tr bgcolor="#e6ffff"><td>History</td>';
       foreach (sort(keys %lasthash)) {        foreach (sort(keys %lasthash)) {
  my ($ign,@parts) = split(/\./,$_);   my ($ign,@parts) = split(/\./,$_);
  if (@parts) {   if ($#parts > 0) {
   my $data=$parts[-1];    my $data=$parts[-1];
   pop(@parts);    pop(@parts);
   $prevattempts.='<th>Part '.join('.',@parts).'<br />'.$data.'</th>';    $prevattempts.='<td>Part '.join('.',@parts).'<br />'.$data.'&nbsp;</td>';
  } else {   } else {
   $prevattempts.='<th>'.$ign.'</th>';    if ($#parts == 0) {
  }      $prevattempts.='<th>'.$parts[0].'</th>';
       }  
       for ($version=1;$version<=$returnhash{'version'};$version++) {  
         $prevattempts.='</tr><tr><th>Attempt '.$version.'</th>';  
         foreach (sort(keys %lasthash)) {  
   my $value;  
   if ($_ =~ /timestamp/) {  
     $value=scalar(localtime($returnhash{$version.':'.$_}));  
   } else {    } else {
     $value=$returnhash{$version.':'.$_};      $prevattempts.='<th>'.$ign.'</th>';
   }    }
   $prevattempts.='<td>'.$value.'</td>';      }
         }  
       }        }
       $prevattempts.='</tr><tr><th>Current</th>';        if ($getattempt eq '') {
    for ($version=1;$version<=$returnhash{'version'};$version++) {
     $prevattempts.='</tr><tr bgcolor="#ffffe6"><td>Transaction '.$version.'</td>';
       foreach (sort(keys %lasthash)) {
          my $value;
          if ($_ =~ /timestamp/) {
     $value=scalar(localtime($returnhash{$version.':'.$_}));
          } else {
     $value=$returnhash{$version.':'.$_};
          }
          $prevattempts.='<td>'.&Apache::lonnet::unescape($value).'&nbsp;</td>';   
       }
    }
         }
         $prevattempts.='</tr><tr bgcolor="#ffffe6"><td>Current</td>';
       foreach (sort(keys %lasthash)) {        foreach (sort(keys %lasthash)) {
  my $value;   my $value;
  if ($_ =~ /timestamp/) {   if ($_ =~ /timestamp/) {
Line 795  sub get_previous_attempt { Line 1883  sub get_previous_attempt {
  } else {   } else {
   $value=$lasthash{$_};    $value=$lasthash{$_};
  }   }
  $prevattempts.='<td>'.$value.'</td>';   $value=&Apache::lonnet::unescape($value);
    if ($_ =~/$regexp$/ && (defined &$gradesub)) {$value = &$gradesub($value)}
    $prevattempts.='<td>'.$value.'&nbsp;</td>';
       }        }
       $prevattempts.='</tr></table>';        $prevattempts.='</tr></table></td></tr></table>';
     } else {      } else {
       $prevattempts='Nothing submitted - no attempts.';        $prevattempts='Nothing submitted - no attempts.';
     }      }
Line 806  sub get_previous_attempt { Line 1896  sub get_previous_attempt {
   }    }
 }  }
   
   sub relative_to_absolute {
       my ($url,$output)=@_;
       my $parser=HTML::TokeParser->new(\$output);
       my $token;
       my $thisdir=$url;
       my @rlinks=();
       while ($token=$parser->get_token) {
    if ($token->[0] eq 'S') {
       if ($token->[1] eq 'a') {
    if ($token->[2]->{'href'}) {
       $rlinks[$#rlinks+1]=$token->[2]->{'href'};
    }
       } elsif ($token->[1] eq 'img' || $token->[1] eq 'embed' ) {
    $rlinks[$#rlinks+1]=$token->[2]->{'src'};
       } elsif ($token->[1] eq 'base') {
    $thisdir=$token->[2]->{'href'};
       }
    }
       }
       $thisdir=~s-/[^/]*$--;
       foreach (@rlinks) {
    unless (($_=~/^http:\/\//i) ||
    ($_=~/^\//) ||
    ($_=~/^javascript:/i) ||
    ($_=~/^mailto:/i) ||
    ($_=~/^\#/)) {
       my $newlocation=&Apache::lonnet::hreflocation($thisdir,$_);
       $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
    }
       }
   # -------------------------------------------------- Deal with Applet codebases
       $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
       return $output;
   }
   
   =pod
   
   =item * get_student_view
   
   show a snapshot of what student was looking at
   
   =cut
   
 sub get_student_view {  sub get_student_view {
   my ($symb,$username,$domain,$courseid) = @_;    my ($symb,$username,$domain,$courseid,$target) = @_;
   my ($map,$id,$feedurl) = split(/___/,$symb);    my ($map,$id,$feedurl) = &Apache::lonnet::decode_symb($symb);
   my (%old,%moreenv);    my (%old,%moreenv);
   my @elements=('symb','courseid','domain','username');    my @elements=('symb','courseid','domain','username');
   foreach my $element (@elements) {    foreach my $element (@elements) {
     $old{$element}=$ENV{'form.grade_'.$element};      $old{$element}=$ENV{'form.grade_'.$element};
     $moreenv{'form.grade_'.$element}=eval '$'.$element #'      $moreenv{'form.grade_'.$element}=eval '$'.$element #'
   }    }
     if ($target eq 'tex') {$moreenv{'form.grade_target'} = 'tex';}
   &Apache::lonnet::appenv(%moreenv);    &Apache::lonnet::appenv(%moreenv);
   my $userview=&Apache::lonnet::ssi('/res/'.$feedurl);    $feedurl=&Apache::lonnet::clutter($feedurl);
     my $userview=&Apache::lonnet::ssi_body($feedurl);
   &Apache::lonnet::delenv('form.grade_');    &Apache::lonnet::delenv('form.grade_');
   foreach my $element (@elements) {    foreach my $element (@elements) {
     $ENV{'form.grade_'.$element}=$old{$element};      $ENV{'form.grade_'.$element}=$old{$element};
Line 828  sub get_student_view { Line 1963  sub get_student_view {
   $userview=~s/\<head\>//gi;    $userview=~s/\<head\>//gi;
   $userview=~s/\<\/head\>//gi;    $userview=~s/\<\/head\>//gi;
   $userview=~s/action\s*\=/would_be_action\=/gi;    $userview=~s/action\s*\=/would_be_action\=/gi;
     $userview=&relative_to_absolute($feedurl,$userview);
   return $userview;    return $userview;
 }  }
   
   =pod
   
   =item * get_student_answers() 
   
   show a snapshot of how student was answering problem
   
   =cut
   
 sub get_student_answers {  sub get_student_answers {
   my ($symb,$username,$domain,$courseid) = @_;    my ($symb,$username,$domain,$courseid,%form) = @_;
   my ($map,$id,$feedurl) = split(/___/,$symb);    my ($map,$id,$feedurl) = &Apache::lonnet::decode_symb($symb);
   my (%old,%moreenv);    my (%old,%moreenv);
   my @elements=('symb','courseid','domain','username');    my @elements=('symb','courseid','domain','username');
   foreach my $element (@elements) {    foreach my $element (@elements) {
Line 842  sub get_student_answers { Line 1986  sub get_student_answers {
   }    }
   $moreenv{'form.grade_target'}='answer';    $moreenv{'form.grade_target'}='answer';
   &Apache::lonnet::appenv(%moreenv);    &Apache::lonnet::appenv(%moreenv);
   my $userview=&Apache::lonnet::ssi('/res/'.$feedurl);    my $userview=&Apache::lonnet::ssi('/res/'.$feedurl,%form);
   &Apache::lonnet::delenv('form.grade_');    &Apache::lonnet::delenv('form.grade_');
   foreach my $element (@elements) {    foreach my $element (@elements) {
     $ENV{'form.grade_'.$element}=$old{$element};      $ENV{'form.grade_'.$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;    return $userview;
 }  }
   
   =pod
   
   =item * &submlink()
   
   Inputs: $text $uname $udom $symb
   
   Returns: A link to grades.pm such as to see the SUBM view of a student
   
   =cut
   
   ###############################################
   sub submlink {
       my ($text,$uname,$udom,$symb)=@_;
       if (!($uname && $udom)) {
    (my $cursymb, my $courseid,$udom,$uname)=
       &Apache::lonxml::whichuser($symb);
    if (!$symb) { $symb=$cursymb; }
       }
       if (!$symb) { $symb=&symbread(); }
       return '<a href="/adm/grades?symb='.$symb.'&student='.$uname.
    '&userdom='.$udom.'&command=submission">'.$text.'</a>';
   }
   ##############################################
   
   =pod
   
   =back
   
   =cut
   
   ###############################################
   
   
   sub timehash {
       my @ltime=localtime(shift);
       return ( 'seconds' => $ltime[0],
                'minutes' => $ltime[1],
                'hours'   => $ltime[2],
                'day'     => $ltime[3],
                'month'   => $ltime[4]+1,
                'year'    => $ltime[5]+1900,
                'weekday' => $ltime[6],
                'dayyear' => $ltime[7]+1,
                'dlsav'   => $ltime[8] );
   }
   
   sub maketime {
       my %th=@_;
       return POSIX::mktime(
           ($th{'seconds'},$th{'minutes'},$th{'hours'},
            $th{'day'},$th{'month'}-1,$th{'year'}-1900,0,0,$th{'dlsav'}));
   }
   
   #########################################
   
   sub findallcourses {
       my %courses=();
       my $now=time;
       foreach (keys %ENV) {
    if ($_=~/^user\.role\.\w+\.\/(\w+)\/(\w+)/) {
       my ($starttime,$endtime)=$ENV{$_};
               my $active=1;
               if ($starttime) {
    if ($now<$starttime) { $active=0; }
               }
               if ($endtime) {
                   if ($now>$endtime) { $active=0; }
               }
               if ($active) { $courses{$1.'_'.$2}=1; }
           }
       }
       return keys %courses;
   }
   
   ###############################################
   ###############################################
   
   =pod
   
   =head1 Domain Template Functions
   
   =over 4
   
   =item * &determinedomain()
   
   Inputs: $domain (usually will be undef)
   
   Returns: Determines which domain should be used for designs
   
   =cut
   
   ###############################################
   sub determinedomain {
       my $domain=shift;
      if (! $domain) {
           # Determine domain if we have not been given one
           $domain = $Apache::lonnet::perlvar{'lonDefDomain'};
           if ($ENV{'user.domain'}) { $domain=$ENV{'user.domain'}; }
           if ($ENV{'request.role.domain'}) { 
               $domain=$ENV{'request.role.domain'}; 
           }
       }
       return $domain;
   }
   ###############################################
   =pod
   
   =item * &domainlogo()
   
   Inputs: $domain (usually will be undef)
   
   Returns: A link to a domain logo, if the domain logo exists.
   If the domain logo does not exist, a description of the domain.
   
   =cut
   
   ###############################################
   sub domainlogo {
       my $domain = &determinedomain(shift);    
        # See if there is a logo
       if (-e '/home/httpd/html/adm/lonDomLogos/'.$domain.'.gif') {
    my $lonhttpdPort=$Apache::lonnet::perlvar{'lonhttpdPort'};
    if (!defined($lonhttpdPort)) { $lonhttpdPort='8080'; }
           return '<img src="http://'.$ENV{'HTTP_HOST'}.':'.$lonhttpdPort.
       '/adm/lonDomLogos/'.$domain.'.gif" alt="'.$domain.'" />';
       } elsif(exists($Apache::lonnet::domaindescription{$domain})) {
           return $Apache::lonnet::domaindescription{$domain};
       } else {
           return '';
       }
   }
   ##############################################
   
   =pod
   
   =item * &designparm()
   
   Inputs: $which parameter; $domain (usually will be undef)
   
   Returns: value of designparamter $which
   
   =cut
   
   ##############################################
   sub designparm {
       my ($which,$domain)=@_;
       if ($ENV{'browser.blackwhite'} eq 'on') {
    if ($which=~/\.(font|alink|vlink|link)$/) {
       return '#000000';
    }
    if ($which=~/\.(pgbg|sidebg)$/) {
       return '#FFFFFF';
    }
    if ($which=~/\.tabbg$/) {
       return '#CCCCCC';
    }
       }
       if ($ENV{'environment.color.'.$which}) {
    return $ENV{'environment.color.'.$which};
       }
       $domain=&determinedomain($domain);
       if ($designhash{$domain.'.'.$which}) {
    return $designhash{$domain.'.'.$which};
       } else {
           return $designhash{'default.'.$which};
       }
   }
   
   ###############################################
   ###############################################
   
   =pod
   
   =back
   
   =head1 HTTP Helpers
   
   =over 4
   
   =item * &bodytag()
   
   Returns a uniform header for LON-CAPA web pages.
   
   Inputs: 
   
   =over 4
   
   =item * $title, A title to be displayed on the page.
   
   =item * $function, the current role (can be undef).
   
   =item * $addentries, extra parameters for the <body> tag.
   
   =item * $bodyonly, if defined, only return the <body> tag.
   
   =item * $domain, if defined, force a given domain.
   
   =item * $forcereg, if page should register as content page (relevant for 
               text interface only)
   
   =back
   
   Returns: A uniform header for LON-CAPA web pages.  
   If $bodyonly is nonzero, a string containing a <body> tag will be returned.
   If $bodyonly is undef or zero, an html string containing a <body> tag and 
   other decorations will be returned.
   
   =cut
   
   sub bodytag {
       my ($title,$function,$addentries,$bodyonly,$domain,$forcereg)=@_;
       $title=&mt($title);
       unless ($function) {
    $function='student';
           if ($ENV{'request.role'}=~/^(cc|in|ta|ep)/) {
       $function='coordinator';
           }
    if ($ENV{'request.role'}=~/^(su|dc|ad|li)/) {
               $function='admin';
           }
           if (($ENV{'request.role'}=~/^(au|ca)/) ||
               ($ENV{'REQUEST_URI'}=~/^(\/priv|\~)/)) {
               $function='author';
           }
       }
       my $img=&designparm($function.'.img',$domain);
       my $pgbg=&designparm($function.'.pgbg',$domain);
       my $tabbg=&designparm($function.'.tabbg',$domain);
       my $font=&designparm($function.'.font',$domain);
       my $link=&designparm($function.'.link',$domain);
       my $alink=&designparm($function.'.alink',$domain);
       my $vlink=&designparm($function.'.vlink',$domain);
       my $sidebg=&designparm($function.'.sidebg',$domain);
   # Accessibility font enhance
       unless ($addentries) { $addentries=''; }
       my $addstyle='';
       if ($ENV{'browser.fontenhance'} eq 'on') {
    $addstyle=' font-size: x-large;';
       }
    # role and realm
       my ($role,$realm)
          =&Apache::lonnet::plaintext((split(/\./,$ENV{'request.role'}))[0]);
   # realm
       if ($ENV{'request.course.id'}) {
    $realm=
            $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
       }
       unless ($realm) { $realm='&nbsp;'; }
   # Set messages
       my $messages=&domainlogo($domain);
   # Port for miniserver
       my $lonhttpdPort=$Apache::lonnet::perlvar{'lonhttpdPort'};
       if (!defined($lonhttpdPort)) { $lonhttpdPort='8080'; }
   # construct main body tag
       my $bodytag = <<END;
   <style>
   h1, h2, h3, th { font-family: Arial, Helvetica, sans-serif }
   a:focus { color: red; background: yellow } 
   </style>
   <body bgcolor="$pgbg" text="$font" alink="$alink" vlink="$vlink" link="$link"
   style="margin-top: 0px;$addstyle" $addentries>
   END
       my $upperleft='<img src="http://'.$ENV{'HTTP_HOST'}.':'.
                      $lonhttpdPort.$img.'" alt="'.$function.'" />';
       if ($bodyonly) {
           return $bodytag;
       } elsif ($ENV{'browser.interface'} eq 'textual') {
   # Accessibility
           return $bodytag.&Apache::lonmenu::menubuttons($forcereg,'web',
                                                         $forcereg).
                  '<h1>LON-CAPA: '.$title.'</h1>';
       } elsif ($ENV{'environment.remote'} eq 'off') {
   # No Remote
           return $bodytag.&Apache::lonmenu::menubuttons($forcereg,'web',
                                                         $forcereg).
         '<table bgcolor="'.$pgbg.'" width="100%" border="0" cellspacing="3" cellpadding="3"><tr><td bgcolor="'.$tabbg.'"><font face="Arial, Helvetica, sans-serif" size="+3" color="'.$font.'"><b>'.$title.
   '</b></font></td></tr></table>';
       }
   
   #
   # Top frame rendering, Remote is up
   #
       return(<<ENDBODY);
   $bodytag
   <table width="100%" cellspacing="0" border="0" cellpadding="0">
   <tr><td bgcolor="$sidebg">
   $upperleft</td>
   <td bgcolor="$sidebg" align="right">$messages&nbsp;</td>
   </tr>
   <tr>
   <td rowspan="3" bgcolor="$tabbg">
   &nbsp;<font size="5" face="Arial, Helvetica, sans-serif"><b>$title</b></font>
   <td bgcolor="$tabbg" align="right">
   <font size="2" face="Arial, Helvetica, sans-serif">
       $ENV{'environment.firstname'}
       $ENV{'environment.middlename'}
       $ENV{'environment.lastname'}
       $ENV{'environment.generation'}
       </font>&nbsp;
   </td>
   </tr>
   <tr><td bgcolor="$tabbg" align="right">
   <font size="2" face="Arial, Helvetica, sans-serif">$role</font>&nbsp;
   </td></tr>
   <tr>
   <td bgcolor="$tabbg" align="right"><font size="2" face="Arial, Helvetica, sans-serif">$realm</font>&nbsp;</td></tr>
   </table><br>
   ENDBODY
   }
   
   ###############################################
   
   sub get_posted_cgi {
       my $r=shift;
   
       my $buffer;
       
       $r->read($buffer,$r->header_in('Content-length'),0);
       unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
    my @pairs=split(/&/,$buffer);
    my $pair;
    foreach $pair (@pairs) {
       my ($name,$value) = split(/=/,$pair);
       $value =~ tr/+/ /;
       $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       $name  =~ tr/+/ /;
       $name  =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       &add_to_env("form.$name",$value);
    }
       } else {
    my $contentsep=$1;
    my @lines = split (/\n/,$buffer);
    my $name='';
    my $value='';
    my $fname='';
    my $fmime='';
    my $i;
    for ($i=0;$i<=$#lines;$i++) {
       if ($lines[$i]=~/^$contentsep/) {
    if ($name) {
       chomp($value);
       if ($fname) {
    $ENV{"form.$name.filename"}=$fname;
    $ENV{"form.$name.mimetype"}=$fmime;
       } else {
    $value=~s/\s+$//s;
       }
       &add_to_env("form.$name",$value);
    }
    if ($i<$#lines) {
       $i++;
       $lines[$i]=~
    /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
       $name=$1;
       $value='';
       if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
    $fname=$1;
    if 
                               ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
    $fmime=$1;
    $i++;
       } else {
    $fmime='';
       }
       } else {
    $fname='';
    $fmime='';
       }
       $i++;
    }
       } else {
    $value.=$lines[$i]."\n";
       }
    }
       }
       $ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
       $r->method_number(M_GET);
       $r->method('GET');
       $r->headers_in->unset('Content-length');
   }
   
   =pod
   
   =item * get_unprocessed_cgi($query,$possible_names)
   
   Modify the %ENV hash to contain unprocessed CGI form parameters held in
   $query.  The parameters listed in $possible_names (an array reference),
   will be set in $ENV{'form.name'} if they do not already exist.
   
   Typically called with $ENV{'QUERY_STRING'} as the first parameter.  
   $possible_names is an ref to an array of form element names.  As an example:
   get_unprocessed_cgi($ENV{'QUERY_STRING'},['uname','udom']);
   will result in $ENV{'form.uname'} and $ENV{'form.udom'} being set.
   
   =cut
   
 sub get_unprocessed_cgi {  sub get_unprocessed_cgi {
   my ($query,$possible_names)= @_;    my ($query,$possible_names)= @_;
   # $Apache::lonxml::debug=1;    # $Apache::lonxml::debug=1;
Line 872  sub get_unprocessed_cgi { Line 2405  sub get_unprocessed_cgi {
   }    }
 }  }
   
   =pod
   
   =item * cacheheader() 
   
   returns cache-controlling header code
   
   =cut
   
 sub cacheheader {  sub cacheheader {
   unless ($ENV{'request.method'} eq 'GET') { return ''; }    unless ($ENV{'request.method'} eq 'GET') { return ''; }
   my $date=strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime);    my $date=strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime);
Line 881  sub cacheheader { Line 2422  sub cacheheader {
   return $output;    return $output;
 }  }
   
   =pod
   
   =item * no_cache($r) 
   
   specifies header code to not have cache
   
   =cut
   
 sub no_cache {  sub no_cache {
   my ($r) = @_;    my ($r) = @_;
   unless ($ENV{'request.method'} eq 'GET') { return ''; }    unless ($ENV{'request.method'} eq 'GET') { return ''; }
Line 890  sub no_cache { Line 2439  sub no_cache {
   #$r->header_out("Expires" => $date);    #$r->header_out("Expires" => $date);
 }  }
   
   sub content_type {
     my ($r,$type,$charset) = @_;
     unless ($charset) {
         $charset=&Apache::lonlocal::current_encoding;
     }
     $r->content_type($type.($charset?'; charset='.$charset:''));
   }
   
   =pod
   
   =item * add_to_env($name,$value) 
   
   adds $name to the %ENV hash with value
   $value, if $name already exists, the entry is converted to an array
   reference and $value is added to the array.
   
   =cut
   
 sub add_to_env {  sub add_to_env {
   my ($name,$value)=@_;    my ($name,$value)=@_;
   if (defined($ENV{$name})) {    if (defined($ENV{$name})) {
Line 907  sub add_to_env { Line 2474  sub add_to_env {
   }    }
 }  }
   
 #---CSV Upload/Handling functions  =pod
   
   =item * get_env_multiple($name) 
   
   gets $name from the %ENV hash, it seemlessly handles the cases where multiple
   values may be defined and end up as an array ref.
   
   returns an array of values
   
   =cut
   
   sub get_env_multiple {
       my ($name) = @_;
       my @values;
       if (defined($ENV{$name})) {
           # exists is it an array
           if (ref($ENV{$name})) {
               @values=@{ $ENV{$name} };
           } else {
               $values[0]=$ENV{$name};
           }
       }
       return(@values);
   }
   
   
 # ========================================================= Store uploaded file  =pod
 # needs $ENV{'form.upfile'}  
 # return $datatoken to be put into hidden field  =back 
   
   =head1 CSV Upload/Handling functions
   
   =over 4
   
   =item * upfile_store($r)
   
   Store uploaded file, $r should be the HTTP Request object,
   needs $ENV{'form.upfile'}
   returns $datatoken to be put into hidden field
   
   =cut
   
 sub upfile_store {  sub upfile_store {
     my $r=shift;      my $r=shift;
Line 923  sub upfile_store { Line 2526  sub upfile_store {
     my $datatoken=$ENV{'user.name'}.'_'.$ENV{'user.domain'}.      my $datatoken=$ENV{'user.name'}.'_'.$ENV{'user.domain'}.
  '_enroll_'.$ENV{'request.course.id'}.'_'.time.'_'.$$;   '_enroll_'.$ENV{'request.course.id'}.'_'.time.'_'.$$;
     {      {
  my $fh=Apache::File->new('>'.$r->dir_config('lonDaemons').          my $datafile = $r->dir_config('lonDaemons').
  '/tmp/'.$datatoken.'.tmp');                             '/tmp/'.$datatoken.'.tmp';
  print $fh $ENV{'form.upfile'};          if ( open(my $fh,">$datafile") ) {
               print $fh $ENV{'form.upfile'};
               close($fh);
           }
     }      }
     return $datatoken;      return $datatoken;
 }  }
   
 # ================================================= Load uploaded file from tmp  =pod
 # needs $ENV{'form.datatoken'}  
 # sets $ENV{'form.upfile'} to the contents of the file  =item * load_tmp_file($r)
   
   Load uploaded file from tmp, $r should be the HTTP Request object,
   needs $ENV{'form.datatoken'},
   sets $ENV{'form.upfile'} to the contents of the file
   
   =cut
   
 sub load_tmp_file {  sub load_tmp_file {
     my $r=shift;      my $r=shift;
     my @studentdata=();      my @studentdata=();
     {      {
  my $fh;          my $studentfile = $r->dir_config('lonDaemons').
  if ($fh=Apache::File->new($r->dir_config('lonDaemons').                                '/tmp/'.$ENV{'form.datatoken'}.'.tmp';
   '/tmp/'.$ENV{'form.datatoken'}.'.tmp')) {          if ( open(my $fh,"<$studentfile") ) {
     @studentdata=<$fh>;              @studentdata=<$fh>;
  }              close($fh);
           }
     }      }
     $ENV{'form.upfile'}=join('',@studentdata);      $ENV{'form.upfile'}=join('',@studentdata);
 }  }
   
 # ========================================= Separate uploaded file into records  =pod
 # returns array of records  
 # needs $ENV{'form.upfile'}  =item * upfile_record_sep()
 # needs $ENV{'form.upfiletype'}  
   Separate uploaded file into records
   returns array of records,
   needs $ENV{'form.upfile'} and $ENV{'form.upfiletype'}
   
   =cut
   
 sub upfile_record_sep {  sub upfile_record_sep {
     if ($ENV{'form.upfiletype'} eq 'xml') {      if ($ENV{'form.upfiletype'} eq 'xml') {
Line 959  sub upfile_record_sep { Line 2577  sub upfile_record_sep {
     }      }
 }  }
   
 # =============================================== Separate a record into fields  =pod
 # needs $ENV{'form.upfiletype'}  
 # takes $record as arg  =item * record_sep($record)
   
   Separate a record into fields $record should be an item from the upfile_record_sep(), needs $ENV{'form.upfiletype'}
   
   =cut
   
 sub record_sep {  sub record_sep {
     my $record=shift;      my $record=shift;
     my %components=();      my %components=();
Line 977  sub record_sep { Line 2600  sub record_sep {
         }          }
     } elsif ($ENV{'form.upfiletype'} eq 'tab') {      } elsif ($ENV{'form.upfiletype'} eq 'tab') {
         my $i=0;          my $i=0;
         foreach (split(/\t+/,$record)) {          foreach (split(/\t/,$record)) {
             my $field=$_;              my $field=$_;
             $field=~s/^(\"|\')//;              $field=~s/^(\"|\')//;
             $field=~s/(\"|\')$//;              $field=~s/(\"|\')$//;
Line 1006  sub record_sep { Line 2629  sub record_sep {
     return %components;      return %components;
 }  }
   
 # =============================== HTML code to select file and specify its type  ######################################################
   ######################################################
   
   =pod
   
   =item * upfile_select_html()
   
   Return HTML code to select a file from the users machine and specify 
   the file type.
   
   =cut
   
   ######################################################
   ######################################################
 sub upfile_select_html {  sub upfile_select_html {
     return (<<'ENDUPFORM');      my %Types = (
 <input type="file" name="upfile" size="50">                   csv   => &mt('CSV (comma separated values, spreadsheet)'),
 <br />Type: <select name="upfiletype">                   space => &mt('Space separated'),
 <option value="csv">CSV (comma separated values, spreadsheet)</option>                   tab   => &mt('Tabulator separated'),
 <option value="space">Space separated</option>  #                 xml   => &mt('HTML/XML'),
 <option value="tab">Tabulator separated</option>                   );
 <option value="xml">HTML/XML</option>      my $Str = '<input type="file" name="upfile" size="50" />'.
 </select>          '<br />Type: <select name="upfiletype">';
 ENDUPFORM      foreach my $type (sort(keys(%Types))) {
 }          $Str .= '<option value="'.$type.'" >'.$Types{$type}."</option>\n";
       }
       $Str .= "</select>\n";
       return $Str;
   }
   
   ######################################################
   ######################################################
   
   =pod
   
   =item * csv_print_samples($r,$records)
   
   Prints a table of sample values from each column uploaded $r is an
   Apache Request ref, $records is an arrayref from
   &Apache::loncommon::upfile_record_sep
   
 # ===================Prints a table of sample values from each column uploaded  =cut
 # $r is an Apache Request ref  
 # $records is an arrayref from &Apache::loncommon::upfile_record_sep  ######################################################
   ######################################################
 sub csv_print_samples {  sub csv_print_samples {
     my ($r,$records) = @_;      my ($r,$records) = @_;
     my (%sone,%stwo,%sthree);      my (%sone,%stwo,%sthree);
     %sone=&record_sep($$records[0]);      %sone=&record_sep($$records[0]);
     if (defined($$records[1])) {%stwo=&record_sep($$records[1]);}      if (defined($$records[1])) {%stwo=&record_sep($$records[1]);}
     if (defined($$records[2])) {%sthree=&record_sep($$records[2]);}      if (defined($$records[2])) {%sthree=&record_sep($$records[2]);}
       #
     $r->print('Samples<br /><table border="2"><tr>');      $r->print(&mt('Samples').'<br /><table border="2"><tr>');
     foreach (sort({$a <=> $b} keys(%sone))) { $r->print('<th>Column&nbsp;'.($_+1).'</th>'); }      foreach (sort({$a <=> $b} keys(%sone))) { 
           $r->print('<th>'.&mt('Column&nbsp;[_1]',($_+1)).'</th>'); }
     $r->print('</tr>');      $r->print('</tr>');
     foreach my $hash (\%sone,\%stwo,\%sthree) {      foreach my $hash (\%sone,\%stwo,\%sthree) {
  $r->print('<tr>');   $r->print('<tr>');
Line 1044  sub csv_print_samples { Line 2697  sub csv_print_samples {
     $r->print('</tr></table><br />'."\n");      $r->print('</tr></table><br />'."\n");
 }  }
   
 # ======Prints a table to create associations between values and table columns  ######################################################
 # $r is an Apache Request ref  ######################################################
 # $records is an arrayref from &Apache::loncommon::upfile_record_sep  
 # $d is an array of 2 element arrays (internal name, displayed name)  =pod
   
   =item * csv_print_select_table($r,$records,$d)
   
   Prints a table to create associations between values and table columns.
   
   $r is an Apache Request ref,
   $records is an arrayref from &Apache::loncommon::upfile_record_sep,
   $d is an array of 2 element arrays (internal name, displayed name)
   
   =cut
   
   ######################################################
   ######################################################
 sub csv_print_select_table {  sub csv_print_select_table {
     my ($r,$records,$d) = @_;      my ($r,$records,$d) = @_;
     my $i=0;my %sone;      my $i=0;my %sone;
     %sone=&record_sep($$records[0]);      %sone=&record_sep($$records[0]);
     $r->print('Associate columns with student attributes.'."\n".      $r->print(&mt('Associate columns with student attributes.')."\n".
      '<table border="2"><tr><th>Attribute</th><th>Column</th></tr>'."\n");       '<table border="2"><tr>'.
                 '<th>'.&mt('Attribute').'</th>'.
                 '<th>'.&mt('Column').'</th></tr>'."\n");
     foreach (@$d) {      foreach (@$d) {
  my ($value,$display)=@{ $_ };   my ($value,$display)=@{ $_ };
  $r->print('<tr><td>'.$display.'</td>');   $r->print('<tr><td>'.$display.'</td>');
Line 1071  sub csv_print_select_table { Line 2739  sub csv_print_select_table {
     return $i;      return $i;
 }  }
   
 # ===================Prints a table of sample values from the upload and  ######################################################
 #                      can make associate samples to internal names  ######################################################
 # $r is an Apache Request ref  
 # $records is an arrayref from &Apache::loncommon::upfile_record_sep  =pod
 # $d is an array of 2 element arrays (internal name, displayed name)  
   =item * csv_samples_select_table($r,$records,$d)
   
   Prints a table of sample values from the upload and can make associate samples to internal names.
   
   $r is an Apache Request ref,
   $records is an arrayref from &Apache::loncommon::upfile_record_sep,
   $d is an array of 2 element arrays (internal name, displayed name)
   
   =cut
   
   ######################################################
   ######################################################
 sub csv_samples_select_table {  sub csv_samples_select_table {
     my ($r,$records,$d) = @_;      my ($r,$records,$d) = @_;
     my %sone; my %stwo; my %sthree;      my %sone; my %stwo; my %sthree;
     my $i=0;      my $i=0;
       #
     $r->print('<table border=2><tr><th>Field</th><th>Samples</th></tr>');      $r->print('<table border=2><tr><th>'.
                 &mt('Field').'</th><th>'.&mt('Samples').'</th></tr>');
     %sone=&record_sep($$records[0]);      %sone=&record_sep($$records[0]);
     if (defined($$records[1])) {%stwo=&record_sep($$records[1]);}      if (defined($$records[1])) {%stwo=&record_sep($$records[1]);}
     if (defined($$records[2])) {%sthree=&record_sep($$records[2]);}      if (defined($$records[2])) {%sthree=&record_sep($$records[2]);}
       #
     foreach (sort keys %sone) {      foreach (sort keys %sone) {
  $r->print('<tr><td><select name=f'.$i.   $r->print('<tr><td><select name="f'.$i.'"'.
   ' onchange="javascript:flip(this.form,'.$i.');">');    ' onchange="javascript:flip(this.form,'.$i.');">');
  foreach (@$d) {   foreach (@$d) {
     my ($value,$display)=@{ $_ };      my ($value,$display)=@{ $_ };
     $r->print('<option value='.$value.'>'.$display.'</option>');      $r->print('<option value="'.$value.'">'.$display.'</option>');
  }   }
  $r->print('</select></td><td>');   $r->print('</select></td><td>');
  if (defined($sone{$_})) { $r->print($sone{$_}."</br>\n"); }   if (defined($sone{$_})) { $r->print($sone{$_}."</br>\n"); }
Line 1103  sub csv_samples_select_table { Line 2784  sub csv_samples_select_table {
     $i--;      $i--;
     return($i);      return($i);
 }  }
 1;  
 __END__;  
   
 =item languageids()   ######################################################
   ######################################################
   
 returns list of all language ids  =pod
   
 =item languagedescription()   =item clean_excel_name($name)
   
 returns description of a specified language id  Returns a replacement for $name which does not contain any illegal characters.
   
 =item copyrightids()   =cut
   
 returns list of all copyrights  ######################################################
   ######################################################
   sub clean_excel_name {
       my ($name) = @_;
       $name =~ s/[:\*\?\/\\]//g;
       if (length($name) > 31) {
           $name = substr($name,0,31);
       }
       return $name;
   }
   
 =item copyrightdescription()   =pod
   
 returns description of a specified copyright id  =item * check_if_partid_hidden($id,$symb,$udom,$uname)
   
 =item filecategories()   Returns either 1 or undef
   
 returns list of all file categories  1 if the part is to be hidden, undef if it is to be shown
   
 =item filecategorytypes()   Arguments are:
   
 returns list of file types belonging to a given file  $id the id of the part to be checked
 category  $symb, optional the symb of the resource to check
   $udom, optional the domain of the user to check for
   $uname, optional the username of the user to check for
   
 =item fileembstyle()   =cut
   
 returns embedding style for a specified file type  sub check_if_partid_hidden {
       my ($id,$symb,$udom,$uname) = @_;
       my $hiddenparts=&Apache::lonnet::EXT('resource.0.hiddenparts',
    $symb,$udom,$uname);
       my $truth=1;
       #if the string starts with !, then the list is the list to show not hide
       if ($hiddenparts=~s/^\s*!//) { $truth=undef; }
       my @hiddenlist=split(/,/,$hiddenparts);
       foreach my $checkid (@hiddenlist) {
    if ($checkid =~ /^\s*\Q$id\E\s*$/) { return $truth; }
       }
       return !$truth;
   }
   
 =item filedescription()   
   
 returns description for a specified file type  ############################################################
   ############################################################
   
 =item filedescriptionex()   =pod
   
 returns description for a specified file type with  =back 
 extra formatting  
   
 =item get_previous_attempt()   =head1 cgi-bin script and graphing routines
   
 return string with previous attempt on problem  =over 4
   
 =item get_student_view()   =item get_cgi_id
   
 show a snapshot of what student was looking at  Inputs: none
   
 =item get_student_answers()   Returns an id which can be used to pass environment variables
   to various cgi-bin scripts.  These environment variables will
   be removed from the users environment after a given time by
   the routine &Apache::lonnet::transfer_profile_to_env.
   
 show a snapshot of how student was answering problem  =cut
   
 =item get_unprocessed_cgi()   ############################################################
   ############################################################
   my $uniq=0;
   sub get_cgi_id {
       $uniq=($uniq+1)%100000;
       return (time.'_'.$uniq);
   }
   
 get unparsed CGI parameters  ############################################################
   ############################################################
   
 =item cacheheader()   =pod
   
 returns cache-controlling header code  =item DrawBarGraph
   
 =item nocache()   Facilitates the plotting of data in a (stacked) bar graph.
   Puts plot definition data into the users environment in order for 
   graph.png to plot it.  Returns an <img> tag for the plot.
   The bars on the plot are labeled '1','2',...,'n'.
   
 specifies header code to not have cache  Inputs:
   
 =item add_to_env($name,$value)   =over 4
   
 adds $name to the %ENV hash with value  =item $Title: string, the title of the plot
 $value, if $name already exists, the entry is converted to an array  
 reference and $value is added to the array.  =item $xlabel: string, text describing the X-axis of the plot
   
   =item $ylabel: string, text describing the Y-axis of the plot
   
   =item $Max: scalar, the maximum Y value to use in the plot
   If $Max is < any data point, the graph will not be rendered.
   
   =item $colors: array ref holding the colors to be used for the data sets when
   they are plotted.  If undefined, default values will be used.
   
   =item @Values: An array of array references.  Each array reference holds data
   to be plotted in a stacked bar chart.
   
   =back
   
   Returns:
   
   An <img> tag which references graph.png and the appropriate identifying
   information for the plot.
   
   =cut
   
   ############################################################
   ############################################################
   sub DrawBarGraph {
       my ($Title,$xlabel,$ylabel,$Max,$colors,@Values)=@_;
       #
       if (! defined($colors)) {
           $colors = ['#33ff00', 
                     '#0033cc', '#990000', '#aaaa66', '#663399', '#ff9933',
                     '#66ccff', '#ff9999', '#cccc33', '#660000', '#33cc66',
                     ]; 
       }
       #
       my $identifier = &get_cgi_id();
       my $id = 'cgi.'.$identifier;        
       if (! @Values || ref($Values[0]) ne 'ARRAY') {
           return '';
       }
       my $NumBars = scalar(@{$Values[0]});
       my %ValuesHash;
       my $NumSets=1;
       foreach my $array (@Values) {
           next if (! ref($array));
           $ValuesHash{$id.'.data.'.$NumSets++} = 
               join(',',@$array);
       }
       #
       my ($height,$width,$xskip,$bar_width) = (200,120,1,15);
       if ($NumBars < 10) {
           $width = 120+$NumBars*15;
           $xskip = 1;
           $bar_width = 15;
       } elsif ($NumBars <= 25) {
           $width = 120+$NumBars*11;
           $xskip = 5;
           $bar_width = 8;
       } elsif ($NumBars <= 50) {
           $width = 120+$NumBars*8;
           $xskip = 5;
           $bar_width = 4;
       } else {
           $width = 120+$NumBars*8;
           $xskip = 5;
           $bar_width = 4;
       }
       #
       my @Labels;
       for (my $i=0;$i<@{$Values[0]};$i++) {
           push (@Labels,$i+1);
       }
       #
       $Max = 1 if ($Max < 1);
       if ( int($Max) < $Max ) {
           $Max++;
           $Max = int($Max);
       }
       $Title  = '' if (! defined($Title));
       $xlabel = '' if (! defined($xlabel));
       $ylabel = '' if (! defined($ylabel));
       $ValuesHash{$id.'.title'}    = &Apache::lonnet::escape($Title);
       $ValuesHash{$id.'.xlabel'}   = &Apache::lonnet::escape($xlabel);
       $ValuesHash{$id.'.ylabel'}   = &Apache::lonnet::escape($ylabel);
       $ValuesHash{$id.'.y_max_value'} = $Max;
       $ValuesHash{$id.'.NumBars'}  = $NumBars;
       $ValuesHash{$id.'.NumSets'}  = $NumSets;
       $ValuesHash{$id.'.PlotType'} = 'bar';
       $ValuesHash{$id.'.Colors'}   = join(',',@{$colors});
       $ValuesHash{$id.'.height'}   = $height;
       $ValuesHash{$id.'.width'}    = $width;
       $ValuesHash{$id.'.xskip'}    = $xskip;
       $ValuesHash{$id.'.bar_width'} = $bar_width;
       $ValuesHash{$id.'.labels'} = join(',',@Labels);
       #
       &Apache::lonnet::appenv(%ValuesHash);
       return '<img src="/cgi-bin/graph.png?'.$identifier.'" border="1" />';
   }
   
   ############################################################
   ############################################################
   
   =pod
   
   =item DrawXYGraph
   
   Facilitates the plotting of data in an XY graph.
   Puts plot definition data into the users environment in order for 
   graph.png to plot it.  Returns an <img> tag for the plot.
   
   Inputs:
   
   =over 4
   
   =item $Title: string, the title of the plot
   
   =item $xlabel: string, text describing the X-axis of the plot
   
   =item $ylabel: string, text describing the Y-axis of the plot
   
   =item $Max: scalar, the maximum Y value to use in the plot
   If $Max is < any data point, the graph will not be rendered.
   
   =item $colors: Array ref containing the hex color codes for the data to be 
   plotted in.  If undefined, default values will be used.
   
   =item $Xlabels: Array ref containing the labels to be used for the X-axis.
   
   =item $Ydata: Array ref containing Array refs.  
   Each of the contained arrays will be plotted as a seperate curve.
   
   =item %Values: hash indicating or overriding any default values which are 
   passed to graph.png.  
   Possible values are: width, xskip, x_ticks, x_tick_offset, among others.
   
   =back
   
   Returns:
   
   An <img> tag which references graph.png and the appropriate identifying
   information for the plot.
   
   =cut
   
   ############################################################
   ############################################################
   sub DrawXYGraph {
       my ($Title,$xlabel,$ylabel,$Max,$colors,$Xlabels,$Ydata,%Values)=@_;
       #
       # Create the identifier for the graph
       my $identifier = &get_cgi_id();
       my $id = 'cgi.'.$identifier;
       #
       $Title  = '' if (! defined($Title));
       $xlabel = '' if (! defined($xlabel));
       $ylabel = '' if (! defined($ylabel));
       my %ValuesHash = 
           (
            $id.'.title'  => &Apache::lonnet::escape($Title),
            $id.'.xlabel' => &Apache::lonnet::escape($xlabel),
            $id.'.ylabel' => &Apache::lonnet::escape($ylabel),
            $id.'.y_max_value'=> $Max,
            $id.'.labels'     => join(',',@$Xlabels),
            $id.'.PlotType'   => 'XY',
            );
       #
       if (defined($colors) && ref($colors) eq 'ARRAY') {
           $ValuesHash{$id.'.Colors'}   = join(',',@{$colors});
       }
       #
       if (! ref($Ydata) || ref($Ydata) ne 'ARRAY') {
           return '';
       }
       my $NumSets=1;
       foreach my $array (@{$Ydata}){
           next if (! ref($array));
           $ValuesHash{$id.'.data.'.$NumSets++} = join(',',@$array);
       }
       $ValuesHash{$id.'.NumSets'} = $NumSets-1;
       #
       # Deal with other parameters
       while (my ($key,$value) = each(%Values)) {
           $ValuesHash{$id.'.'.$key} = $value;
       }
       #
       &Apache::lonnet::appenv(%ValuesHash);
       return '<img src="/cgi-bin/graph.png?'.$identifier.'" border="1" />';
   }
   
   ############################################################
   ############################################################
   
   =pod
   
   =item DrawXYYGraph
   
   Facilitates the plotting of data in an XY graph with two Y axes.
   Puts plot definition data into the users environment in order for 
   graph.png to plot it.  Returns an <img> tag for the plot.
   
   Inputs:
   
   =over 4
   
   =item $Title: string, the title of the plot
   
   =item $xlabel: string, text describing the X-axis of the plot
   
   =item $ylabel: string, text describing the Y-axis of the plot
   
   =item $colors: Array ref containing the hex color codes for the data to be 
   plotted in.  If undefined, default values will be used.
   
   =item $Xlabels: Array ref containing the labels to be used for the X-axis.
   
   =item $Ydata1: The first data set
   
   =item $Min1: The minimum value of the left Y-axis
   
   =item $Max1: The maximum value of the left Y-axis
   
   =item $Ydata2: The second data set
   
   =item $Min2: The minimum value of the right Y-axis
   
   =item $Max2: The maximum value of the left Y-axis
   
   =item %Values: hash indicating or overriding any default values which are 
   passed to graph.png.  
   Possible values are: width, xskip, x_ticks, x_tick_offset, among others.
   
 =back  =back
   
   Returns:
   
   An <img> tag which references graph.png and the appropriate identifying
   information for the plot.
   
 =cut  =cut
   
   ############################################################
   ############################################################
   sub DrawXYYGraph {
       my ($Title,$xlabel,$ylabel,$colors,$Xlabels,$Ydata1,$Min1,$Max1,
                                           $Ydata2,$Min2,$Max2,%Values)=@_;
       #
       # Create the identifier for the graph
       my $identifier = &get_cgi_id();
       my $id = 'cgi.'.$identifier;
       #
       $Title  = '' if (! defined($Title));
       $xlabel = '' if (! defined($xlabel));
       $ylabel = '' if (! defined($ylabel));
       my %ValuesHash = 
           (
            $id.'.title'  => &Apache::lonnet::escape($Title),
            $id.'.xlabel' => &Apache::lonnet::escape($xlabel),
            $id.'.ylabel' => &Apache::lonnet::escape($ylabel),
            $id.'.labels' => join(',',@$Xlabels),
            $id.'.PlotType' => 'XY',
            $id.'.NumSets' => 2,
            $id.'.two_axes' => 1,
            $id.'.y1_max_value' => $Max1,
            $id.'.y1_min_value' => $Min1,
            $id.'.y2_max_value' => $Max2,
            $id.'.y2_min_value' => $Min2,
            );
       #
       if (defined($colors) && ref($colors) eq 'ARRAY') {
           $ValuesHash{$id.'.Colors'}   = join(',',@{$colors});
       }
       #
       if (! ref($Ydata1) || ref($Ydata1) ne 'ARRAY' ||
           ! ref($Ydata2) || ref($Ydata2) ne 'ARRAY'){
           return '';
       }
       my $NumSets=1;
       foreach my $array ($Ydata1,$Ydata2){
           next if (! ref($array));
           $ValuesHash{$id.'.data.'.$NumSets++} = join(',',@$array);
       }
       #
       # Deal with other parameters
       while (my ($key,$value) = each(%Values)) {
           $ValuesHash{$id.'.'.$key} = $value;
       }
       #
       &Apache::lonnet::appenv(%ValuesHash);
       return '<img src="/cgi-bin/graph.png?'.$identifier.'" border="1" />';
   }
   
   ############################################################
   ############################################################
   
   =pod
   
   =back 
   
   =head1 Statistics helper routines?  
   
   Bad place for them but what the hell.
   
   =over 4
   
   =item &chartlink
   
   Returns a link to the chart for a specific student.  
   
   Inputs:
   
   =over 4
   
   =item $linktext: The text of the link
   
   =item $sname: The students username
   
   =item $sdomain: The students domain
   
   =back
   
   =back
   
   =cut
   
   ############################################################
   ############################################################
   sub chartlink {
       my ($linktext, $sname, $sdomain) = @_;
       my $link = '<a href="/adm/statistics?reportSelected=student_assessment'.
           '&SelectedStudent='.&Apache::lonnet::escape($sname.':'.$sdomain).
           '&chartoutputmode='.HTML::Entities::encode('html, with all links').
          '">'.$linktext.'</a>';
   }
   
   #######################################################
   #######################################################
   
   =pod
   
   =head1 Course Environment Routines
   
   =over 4
   
   =item &restore_course_settings 
   
   =item &store_course_settings
   
   Restores/Store indicated form parameters from the course environment.
   Will not overwrite existing values of the form parameters.
   
   Inputs: 
   a scalar describing the data (e.g. 'chart', 'problem_analysis')
   
   a hash ref describing the data to be stored.  For example:
      
   %Save_Parameters = ('Status' => 'scalar',
       'chartoutputmode' => 'scalar',
       'chartoutputdata' => 'scalar',
       'Section' => 'array',
       'StudentData' => 'array',
       'Maps' => 'array');
   
   Returns: both routines return nothing
   
   =cut
   
   #######################################################
   #######################################################
   sub store_course_settings {
       # save to the environment
       # appenv the same items, just to be safe
       my $courseid = $ENV{'request.course.id'};
       my $coursedom = $ENV{'course.'.$courseid.'.domain'};
       my ($prefix,$Settings) = @_;
       my %SaveHash;
       my %AppHash;
       while (my ($setting,$type) = each(%$Settings)) {
           my $basename = 'env.internal.'.$prefix.'.'.$setting;
           my $envname = 'course.'.$courseid.'.'.$basename;
           if (exists($ENV{'form.'.$setting})) {
               # Save this value away
               if ($type eq 'scalar' &&
                   (! exists($ENV{$envname}) || 
                    $ENV{$envname} ne $ENV{'form.'.$setting})) {
                   $SaveHash{$basename} = $ENV{'form.'.$setting};
                   $AppHash{$envname}   = $ENV{'form.'.$setting};
               } elsif ($type eq 'array') {
                   my $stored_form;
                   if (ref($ENV{'form.'.$setting})) {
                       $stored_form = join(',',
                                           map {
                                               &Apache::lonnet::escape($_);
                                           } sort(@{$ENV{'form.'.$setting}}));
                   } else {
                       $stored_form = 
                           &Apache::lonnet::escape($ENV{'form.'.$setting});
                   }
                   # Determine if the array contents are the same.
                   if ($stored_form ne $ENV{$envname}) {
                       $SaveHash{$basename} = $stored_form;
                       $AppHash{$envname}   = $stored_form;
                   }
               }
           }
       }
       my $put_result = &Apache::lonnet::put('environment',\%SaveHash,
                                             $coursedom,
                                             $ENV{'course.'.$courseid.'.num'});
       if ($put_result !~ /^(ok|delayed)/) {
           &Apache::lonnet::logthis('unable to save form parameters, '.
                                    'got error:'.$put_result);
       }
       # Make sure these settings stick around in this session, too
       &Apache::lonnet::appenv(%AppHash);
       return;
   }
   
   sub restore_course_settings {
       my $courseid = $ENV{'request.course.id'};
       my ($prefix,$Settings) = @_;
       while (my ($setting,$type) = each(%$Settings)) {
           next if (exists($ENV{'form.'.$setting}));
           my $envname = 'course.'.$courseid.'.env.internal.'.$prefix.
               '.'.$setting;
           if (exists($ENV{$envname})) {
               if ($type eq 'scalar') {
                   $ENV{'form.'.$setting} = $ENV{$envname};
               } elsif ($type eq 'array') {
                   $ENV{'form.'.$setting} = [ 
                                              map { 
                                                  &Apache::lonnet::unescape($_); 
                                              } split(',',$ENV{$envname})
                                              ];
               }
           }
       }
   }
   
   ############################################################
   ############################################################
   
   sub propath {
       my ($udom,$uname)=@_;
       $udom=~s/\W//g;
       $uname=~s/\W//g;
       my $subdir=$uname.'__';
       $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
       my $proname="$Apache::lonnet::perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
       return $proname;
   } 
   
   sub icon {
       my ($file)=@_;
       my $curfext = (split(/\./,$file))[-1];
       my $iconname=$Apache::lonnet::perlvar{'lonIconsURL'}.'/unknown.gif';
       my $embstyle = &Apache::loncommon::fileembstyle($curfext);
       if (!(!defined($embstyle) || $embstyle eq 'unk' || $embstyle eq 'hdn')) {
    if (-e  $Apache::lonnet::perlvar{'lonDocRoot'}.'/'.
             $Apache::lonnet::perlvar{'lonIconsURL'}.'/'.
               $curfext.".gif") {
       $iconname=$Apache::lonnet::perlvar{'lonIconsURL'}.'/'.
    $curfext.".gif";
    }
       }
       return $iconname;
   } 
   
   =pod
   
   =back
   
   =cut
   
   1;
   __END__;
   
Removed from v.1.36  
changed lines
  Added in v.1.171

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