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Diff for /loncom/interface/loncommon.pm between versions 1.35 and 1.71

version 1.35, 2002/04/23 21:42:01 version 1.71, 2002/10/29 20:57:31
Line 33 Line 33
 # 12/25,12/28 Gerd Kortemeyer  # 12/25,12/28 Gerd Kortemeyer
 # YEAR=2002  # YEAR=2002
 # 1/4 Gerd Kortemeyer  # 1/4 Gerd Kortemeyer
   # 6/24,7/2 H. K. Ng
   
 # 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 41
   
 # POD header:  # POD header:
   
   =pod
   
 =head1 NAME  =head1 NAME
   
 Apache::loncommon - pile of common routines  Apache::loncommon - pile of common routines
Line 65  Current things done: Line 68  Current things done:
 This is part of the LearningOnline Network with CAPA project  This is part of the LearningOnline Network with CAPA project
 described at http://www.lon-capa.org.  described at http://www.lon-capa.org.
   
 =head2 Subroutines  =head2 General Subroutines
   
 =over 4  =over 4
   
Line 76  package Apache::loncommon; Line 79  package Apache::loncommon;
   
 use strict;  use strict;
 use Apache::lonnet();  use Apache::lonnet();
 use POSIX qw(strftime);  use GDBM_File;
   use POSIX qw(strftime mktime);
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
 use Apache::lonmsg();  use Apache::lonmsg();
   
 my $readit;  my $readit;
   
   =pod 
   
   =item Global Variables
   
   =over 4
   
   =cut
 # ----------------------------------------------- Filetypes/Languages/Copyright  # ----------------------------------------------- Filetypes/Languages/Copyright
 my %language;  my %language;
 my %cprtag;  my %cprtag;
 my %fe; my %fd;  my %fe; my %fd;
 my %fc;  my %category_extensions;
   
   # ---------------------------------------------- Designs
   
   my %designhash;
   
   # ---------------------------------------------- Thesaurus variables
   
   =pod
   
   =item %Keywords  
   
   A hash used by &keyword to determine if a word is considered a keyword.
   
   =item $thesaurus_db_file
   
   Scalar containing the full path to the thesaurus database.                 
   
   =cut
   
   my %Keywords;
   my $thesaurus_db_file;
   
   
   =pod
   
 # -------------------------------------------------------------- Thesaurus data  =back
 my @therelated;  
 my @theword;  =cut
 my @thecount;  
 my %theindex;  
 my $thetotalcount;  
 my $thefuzzy=2;  
 my $thethreshold=0.1/$thefuzzy;  
 my $theavecount;  
   
 # ----------------------------------------------------------------------- BEGIN  # ----------------------------------------------------------------------- BEGIN
   
   =pod
   
 =item BEGIN()   =item BEGIN() 
   
 Initialize values from language.tab, copyright.tab, filetypes.tab,  Initialize values from language.tab, copyright.tab, filetypes.tab,
 and filecategories.tab.  thesaurus.tab, and filecategories.tab.
   
 =cut  =cut
   
 # ----------------------------------------------------------------------- BEGIN  # ----------------------------------------------------------------------- BEGIN
   
 BEGIN {  BEGIN {
       # Variable initialization
       $thesaurus_db_file = $Apache::lonnet::perlvar{'lonTabDir'}."/thesaurus.db";
       #
     unless ($readit) {      unless ($readit) {
 # ------------------------------------------------------------------- languages  # ------------------------------------------------------------------- languages
     {      {
Line 136  BEGIN { Line 170  BEGIN {
     }      }
  }   }
     }      }
   
   # -------------------------------------------------------------- domain designs
   
       my $filename;
       my $designdir=$Apache::lonnet::perlvar{'lonTabDir'}.'/lonDomColors';
       opendir(DIR,$designdir);
       while ($filename=readdir(DIR)) {
    my ($domain)=($filename=~/^(\w+)\./);
       {
    my $fh=Apache::File->new($designdir.'/'.$filename);
    if ($fh) {
       while (<$fh>) {
    next if /^\#/;
    chomp;
    my ($key,$val)=(split(/\=/,$_));
    if ($val) { $designhash{$domain.'.'.$key}=$val; }
       }
    }
       }
   
       }
       closedir(DIR);
   
   
 # ------------------------------------------------------------- file categories  # ------------------------------------------------------------- file categories
     {      {
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.   my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
Line 144  BEGIN { Line 202  BEGIN {
     while (<$fh>) {      while (<$fh>) {
  next if /^\#/;   next if /^\#/;
  chomp;   chomp;
  my ($key,$val)=(split(/\s+/,$_,2));   my ($extension,$category)=(split(/\s+/,$_,2));
  push @{$fc{$key}},$val;   push @{$category_extensions{lc($category)}},$extension;
     }      }
  }   }
     }      }
Line 165  BEGIN { Line 223  BEGIN {
     }      }
  }   }
     }      }
 # -------------------------------------------------------------- Thesaurus data  
     {  
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.  
        '/thesaurus.dat');  
  if ($fh) {  
             while (<$fh>) {  
                my ($tword,$tindex,$tcount,$trelated)=split(/\@/,$_);  
                $theindex{$tword}=$tindex;  
                $theword[$tindex]=$tword;  
                $thecount[$tindex]=$tcount;  
                $thetotalcount+=$tcount;  
                $therelated[$tindex]=$trelated;  
    }  
         }  
         $theavecount=$thetotalcount/$#thecount;  
     }  
     &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  # ============================================================= END BEGIN BLOCK
 ###############################################################  ###############################################################
   ##           HTML and Javascript Helper Functions            ##
   ###############################################################
   
   =pod 
   
   =item browser_and_searcher_javascript 
   
   Returns scalar containing javascript to open a browser window
   or a searcher window.  Also creates 
   
   =over 4
   
   =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.
   
   =back
   
   =cut
   
   ###############################################################
   sub browser_and_searcher_javascript {
       return <<END;
       var editbrowser = null;
       function openbrowser(formname,elementname,only,omit) {
           var url = '/res/?';
           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 + '&';
           }
           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) {
           var url = '/adm/searchcat?';
           if (editsearcher == null) {
               url += 'launch=1&';
           }
           url += 'catalogmode=interactive&';
           url += 'mode=edit&';
           url += 'form=' + formname + '&';
           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
   }
   
   
   
   ###############################################################
   
   =pod
   
   =item linked_select_forms(...)
   
   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
   changing the value of the first menu will result in new values being placed
   in the second menu.  The values in the select menu will appear in alphabetical
   order.
   
   linked_select_forms takes the following ordered inputs:
   
   =over 4
   
   =item $formname, the name of the <form> tag
   
   =item $middletext, the text which appears between the <select> tags
   
   =item $firstdefault, the default value for the first menu
   
   =item $firstselectname, the name of the first <select> tag
   
   =item $secondselectname, the name of the second <select> tag
   
   =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 
   'select2' keys must appear as stated.  keys(%menu) are the possible 
   values for the first select menu.  The text that coincides with the 
   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 
   $menu{$choice1}->{'select2'}.  
   
   my %menu = ( A1 => { text =>"Choice A1" ,
                         default => "B3",
                         select2 => { 
                             B1 => "Choice B1",
                             B2 => "Choice B2",
                             B3 => "Choice B3",
                             B4 => "Choice B4"
                             }
                     },
                 A2 => { text =>"Choice A2" ,
                         default => "C2",
                         select2 => { 
                             C1 => "Choice C1",
                             C2 => "Choice C2",
                             C3 => "Choice C3"
                             }
                     },
                 A3 => { text =>"Choice A3" ,
                         default => "D6",
                         select2 => { 
                             D1 => "Choice D1",
                             D2 => "Choice D2",
                             D3 => "Choice D3",
                             D4 => "Choice D4",
                             D5 => "Choice D5",
                             D6 => "Choice D6",
                             D7 => "Choice D7"
                             }
                     }
                 );
   
   =cut
   
   # ------------------------------------------------
   
   sub linked_select_forms {
       my ($formname,
           $middletext,
           $firstdefault,
           $firstselectname,
           $secondselectname, 
           $hashref
           ) = @_;
       my $second = "document.$formname.$secondselectname";
       my $first = "document.$formname.$firstselectname";
       # output the javascript to do the changing
       my $result = '';
       $result.="<script>\n";
       $result.="var select2data = new Object();\n";
       $" = '","';
       my $debug = '';
       foreach my $s1 (sort(keys(%$hashref))) {
           $result.="select2data.d_$s1 = new Object();\n";        
           $result.="select2data.d_$s1.def = new String('".
               $hashref->{$s1}->{'default'}."');\n";
           $result.="select2data.d_$s1.values = new Array(";        
           my @s2values = sort(keys( %{ $hashref->{$s1}->{'select2'} } ));
           $result.="\"@s2values\");\n";
           $result.="select2data.d_$s1.texts = new Array(";        
           my @s2texts;
           foreach my $value (@s2values) {
               push @s2texts, $hashref->{$s1}->{'select2'}->{$value};
           }
           $result.="\"@s2texts\");\n";
       }
       $"=' ';
       $result.= <<"END";
   
   function select1_changed() {
       // Determine new choice
       var newvalue = "d_" + $first.value;
       // update select2
       var values     = select2data[newvalue].values;
       var texts      = select2data[newvalue].texts;
       var select2def = select2data[newvalue].def;
       var i;
       // out with the old
       for (i = 0; i < $second.options.length; i++) {
           $second.options[i] = null;
       }
       // in with the nuclear
       for (i=0;i<values.length; i++) {
           $second.options[i] = new Option(values[i]);
           $second.options[i].text = texts[i];
           if (values[i] == select2def) {
               $second.options[i].selected = true;
           }
       }
   }
   </script>
   END
       # output the initial values for the selection lists
       $result .= "<select size=\"1\" name=\"$firstselectname\" onchange=\"select1_changed()\">\n";
       foreach my $value (sort(keys(%$hashref))) {
           $result.="    <option value=\"$value\" ";
           $result.=" selected=\"true\" " if ($value eq $firstdefault);
           $result.=">$hashref->{$value}->{'text'}</option>\n";
       }
       $result .= "</select>\n";
       my %select2 = %{$hashref->{$firstdefault}->{'select2'}};
       $result .= $middletext;
       $result .= "<select size=\"1\" name=\"$secondselectname\">\n";
       my $seconddefault = $hashref->{$firstdefault}->{'default'};
       foreach my $value (sort(keys(%select2))) {
           $result.="    <option value=\"$value\" ";        
           $result.=" selected=\"true\" " if ($value eq $seconddefault);
           $result.=">$select2{$value}</option>\n";
       }
       $result .= "</select>\n";
       #    return $debug;
       return $result;
   }   #  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);
       $width = 350 if (not defined $width);
       $height = 400 if (not defined $height);
       my $filename = $topic;
       $filename =~ s/ /_/g;
   
       my $template = "";
       my $link;
   
       if (!$stayOnPage)
       {
    $link = "javascript:void(open('/adm/help/${filename}.hlp', 'Help_for_$topic', 'menubar=0,toolbar=1,scrollbars=1,width=$width,height=$height'))";
       }
       else
       {
    $link = "/adm/help/${filename}.hlp";
       }
   
       # Add the text
       if ($text ne "")
       {
    $template .= "<a href=\"$link\">$text</a> ";
       }
   
       # Add the graphic
       $template .= <<"ENDTEMPLATE";
   <a href="$link"><image src="/adm/help/gif/smallHelp.gif" border="0" alt="(Help: $topic)" /></a>
   ENDTEMPLATE
   
       return $template;
   
   }
   
   =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;
   }
   
   ###############################################################
 ##        Home server <option> list generating code          ##  ##        Home server <option> list generating code          ##
 ###############################################################  ###############################################################
 #-------------------------------------------  #-------------------------------------------
   
   =pod
   
 =item get_domains()  =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
Line 213  sub get_domains { Line 558  sub get_domains {
   
 #-------------------------------------------  #-------------------------------------------
   
   =pod
   
 =item select_dom_form($defdom,$name)  =item select_dom_form($defdom,$name)
   
 Returns a string containing a <select name='$name' size='1'> form to   Returns a string containing a <select name='$name' size='1'> form to 
Line 237  sub select_dom_form { Line 584  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 246  given $domain. Line 595  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;
 }  }
   
 #-------------------------------------------  #-------------------------------------------
   
   =pod
   
 =item home_server_option_list($domain)  =item home_server_option_list($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 
Line 269  returns a string which contains an <opti Line 620  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 291  sub home_server_option_list { Line 642  sub home_server_option_list {
 ##    formname = the name given in the <form> tag.  ##    formname = the name given in the <form> tag.
 #-------------------------------------------  #-------------------------------------------
   
   =pod
   
 =item authform_xxxxxx  =item authform_xxxxxx
   
 The authform_xxxxxx subroutines provide javascript and html forms which   The authform_xxxxxx subroutines provide javascript and html forms which 
Line 410  sub authform_nochange{ Line 763  sub authform_nochange{
     my $result='';      my $result='';
     $result.=<<"END";      $result.=<<"END";
 <input type="radio" name="login" value="nochange" checked="checked"  <input type="radio" name="login" value="nochange" checked="checked"
        onclick="javascript:changed_radio('nochange',$in{'formname'});">         onclick="javascript:changed_radio('nochange',$in{'formname'});" />
 Do not change login data  Do not change login data
 END  END
     return $result;      return $result;
Line 426  sub authform_kerberos{ Line 779  sub authform_kerberos{
     $result.=<<"END";      $result.=<<"END";
 <input type="radio" name="login" value="krb"   <input type="radio" name="login" value="krb" 
        onclick="javascript:changed_radio('krb',$in{'formname'});"         onclick="javascript:changed_radio('krb',$in{'formname'});"
        onchange="javascript:changed_radio('krb',$in{'formname'});">         onchange="javascript:changed_radio('krb',$in{'formname'});" />
 Kerberos authenticated with domain  Kerberos authenticated with domain
 <input type="text" size="10" name="krbarg" value=""  <input type="text" size="10" name="krbarg" value=""
        onchange="javascript:changed_text('krb',$in{'formname'});">         onchange="javascript:changed_text('krb',$in{'formname'});" />
   <input type="radio" name="krbver" value="4" checked="on" />Version 4
   <input type="radio" name="krbver" value="5" />Version 5
 END  END
     return $result;      return $result;
 }  }
Line 444  sub authform_internal{ Line 799  sub authform_internal{
     $result.=<<"END";      $result.=<<"END";
 <input type="radio" name="login" value="int"  <input type="radio" name="login" value="int"
        onchange="javascript:changed_radio('int',$args{'formname'});"         onchange="javascript:changed_radio('int',$args{'formname'});"
        onclick="javascript:changed_radio('int',$args{'formname'});">         onclick="javascript:changed_radio('int',$args{'formname'});" />
 Internally authenticated (with initial password   Internally authenticated (with initial password 
 <input type="text" size="10" name="intarg" value=""  <input type="text" size="10" name="intarg" value=""
        onchange="javascript:changed_text('int',$args{'formname'});">         onchange="javascript:changed_text('int',$args{'formname'});" />
 END  END
     return $result;      return $result;
 }  }
Line 462  sub authform_local{ Line 817  sub authform_local{
     $result.=<<"END";      $result.=<<"END";
 <input type="radio" name="login" value="loc"  <input type="radio" name="login" value="loc"
        onchange="javascript:changed_radio('loc',$in{'formname'});"         onchange="javascript:changed_radio('loc',$in{'formname'});"
        onclick="javascript:changed_radio('loc',$in{'formname'});">          onclick="javascript:changed_radio('loc',$in{'formname'});" />
 Local Authentication with argument  Local Authentication with argument
 <input type="text" size="10" name="locarg" value=""  <input type="text" size="10" name="locarg" value=""
        onchange="javascript:changed_text('loc',$in{'formname'});">         onchange="javascript:changed_text('loc',$in{'formname'});" />
 END  END
     return $result;      return $result;
 }  }
Line 480  sub authform_filesystem{ Line 835  sub authform_filesystem{
     $result.=<<"END";      $result.=<<"END";
 <input type="radio" name="login" value="fsys"   <input type="radio" name="login" value="fsys" 
        onchange="javascript:changed_radio('fsys',$in{'formname'});"         onchange="javascript:changed_radio('fsys',$in{'formname'});"
        onclick="javascript:changed_radio('fsys',$in{'formname'});">          onclick="javascript:changed_radio('fsys',$in{'formname'});" />
 Filesystem authenticated (with initial password   Filesystem authenticated (with initial password 
 <input type="text" size="10" name="fsysarg" value=""  <input type="text" size="10" name="fsysarg" value=""
        onchange="javascript:changed_text('fsys',$in{'formname'});">         onchange="javascript:changed_text('fsys',$in{'formname'});">
Line 492  END Line 847  END
 ##   End Authentication changing form generation functions   ##  ##   End Authentication changing form generation functions   ##
 ###############################################################  ###############################################################
   
   ###############################################################
   ##                Thesaurus Functions                        ##
   ###############################################################
   
   =pod
   
   =item initialize_keywords
   
   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
   
 # ---------------------------------------------------------- Is this a keyword?  =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 arguement 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;
   }
   
   ###############################################################
   ##              End Thesaurus Functions                      ##
   ###############################################################
   
   # -------------------------------------------------------------- Plaintext name
   
   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
   
   
   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;
   }
   
   
   # ------------------------------------------------------------------ Screenname
   
   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>";
   }
   # ------------------------------------------------------------- Aboutme Wrapper
   
   sub aboutmewrapper {
       my ($link,$username,$domain)=@_;
       return "<a href='/adm/$domain/$username/aboutme'>$link</a>";
   }
   
   # ------------------------------------------------------------ Syllabus Wrapper
   
   
   sub syllabuswrapper {
       my ($link,$un,$do)=@_;
       return "<a href='/public/$do/$un/syllabus'>$link</a>";
 }  }
   
 # ---------------------------------------------------------------- Language IDs  # ---------------------------------------------------------------- Language IDs
Line 574  sub copyrightdescription { Line 1047  sub copyrightdescription {
   
 # ------------------------------------------------------------- File Categories  # ------------------------------------------------------------- File Categories
 sub filecategories {  sub filecategories {
     return sort(keys(%fc));      return sort(keys(%category_extensions));
 }  }
   
 # -------------------------------------- File Types within a specified category  # -------------------------------------- File Types within a specified category
 sub filecategorytypes {  sub filecategorytypes {
     return @{$fc{lc(shift(@_))}};      return @{$category_extensions{lc($_[0])}};
 }  }
   
 # ------------------------------------------------------------------ File Types  # ------------------------------------------------------------------ File Types
Line 603  sub filedescriptionex { Line 1076  sub filedescriptionex {
     return '.'.$ex.' '.$fd{lc($ex)};      return '.'.$ex.' '.$fd{lc($ex)};
 }  }
   
   # ---- Retrieve attempts by students
   # input
   # $symb             - problem including path
   # $username,$domain - that of the student
   # $course           - course name
   # $getattempt       - leave blank if want all attempts, else put something.
   # $regexp           - regular expression. If string matches regexp send to
   # $gradesub         - routine that process the string if it matches regexp
   # 
   # output
   # formatted as a table all the attempts, if any.
   #
 sub get_previous_attempt {  sub get_previous_attempt {
   my ($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 617  sub get_previous_attempt { Line 1103  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>';      }
         }        }
         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{$version.':'.$_};
          }
          $prevattempts.='<td>'.$value.'&nbsp;</td>';   
       }
    }
       }        }
       $prevattempts.='</tr><tr><th>Current</th>';        $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 648  sub get_previous_attempt { Line 1141  sub get_previous_attempt {
  } else {   } else {
   $value=$lasthash{$_};    $value=$lasthash{$_};
  }   }
  $prevattempts.='<td>'.$value.'</td>';   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 660  sub get_previous_attempt { Line 1154  sub get_previous_attempt {
 }  }
   
 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) = split(/___/,$symb);
   my (%old,%moreenv);    my (%old,%moreenv);
   my @elements=('symb','courseid','domain','username');    my @elements=('symb','courseid','domain','username');
Line 668  sub get_student_view { Line 1162  sub get_student_view {
     $old{$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);    my $userview=&Apache::lonnet::ssi('/res/'.$feedurl);
   &Apache::lonnet::delenv('form.grade_');    &Apache::lonnet::delenv('form.grade_');
Line 700  sub get_student_answers { Line 1195  sub get_student_answers {
   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;
 }  }
   
   ###############################################
   
   
   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'}));
   }
   
   
   #########################################
   #
   # Retro-fixing of un-backward-compatible time format
   
   sub unsqltime {
       my $timestamp=shift;
       if ($timestamp=~/^(\d+)\-(\d+)\-(\d+)\s+(\d+)\:(\d+)\:(\d+)$/) {
          $timestamp=&maketime(
      'year'=>$1,'month'=>$2,'day'=>$3,
              'hours'=>$4,'minutes'=>$5,'seconds'=>$6);
       }
       return $timestamp;
   }
   
   #########################################
   
   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
   
   =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') {
           return '<img src="http://'.$ENV{'HTTP_HOST'}.':8080/adm/lonDomLogos/'.
                  $domain.'.gif" />';
       } elsif(exists($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)=@_;
       $domain=&determinedomain($domain);
       if ($designhash{$domain.'.'.$which}) {
    return $designhash{$domain.'.'.$which};
       } else {
           return $designhash{'default.'.$which};
       }
   }
   
   ###############################################
   ###############################################
   
   =pod
   
   =item &bodytag()
   
   Returns a uniform header for LON-CAPA web pages.
   
   Inputs: 
   
    $title, A title to be displayed on the page.
    $function, the current role (can be undef).
    $addentries, extra parameters for the <body> tag.
    $bodyonly, if defined, only return the <body> tag.
    $domain, if defined, force a given domain.
   
   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,$domain)=@_;
       unless ($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);
   
    # 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);
   # Output
       my $bodytag = <<END;
   <body bgcolor="$pgbg" text="$font" alink="$alink" vlink="$vlink" link="$link"
   $addentries>
   END
       if ($bodyonly) {
           return $bodytag;
       } else {
           return(<<ENDBODY);
   $bodytag
   <table width="100%" cellspacing="0" border="0" cellpadding="0">
   <tr><td bgcolor="$font">
   <img src="http://$ENV{'HTTP_HOST'}:8080/$img" /></td>
   <td bgcolor="$font"><font color='$sidebg'>$messages</font></td>
   </tr>
   <tr>
   <td rowspan="3" bgcolor="$tabbg">
   &nbsp;<font size="5"><b>$title</b></font>
   <td bgcolor="$tabbg"  align="right">
   <font size="2">
       $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">$role</font>&nbsp;
   </td></tr>
   <tr>
   <td bgcolor="$tabbg" align="right"><font size="2">$realm</font>&nbsp;</td></tr>
   </table><br>
   ENDBODY
       }
   }
   ###############################################
   
 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 760  sub add_to_env { Line 1480  sub add_to_env {
   }    }
 }  }
   
 #---CSV Upload/Handling functions  =pod
   
   =back 
   
   =head2 CSV Upload/Handling functions
   
   =over 4
   
   =item  upfile_store($r)
   
 # ========================================================= Store uploaded file  Store uploaded file, $r should be the HTTP Request object,
 # needs $ENV{'form.upfile'}  needs $ENV{'form.upfile'}
 # return $datatoken to be put into hidden field  returns $datatoken to be put into hidden field
   
   =cut
   
 sub upfile_store {  sub upfile_store {
     my $r=shift;      my $r=shift;
Line 783  sub upfile_store { Line 1513  sub upfile_store {
     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;
Line 800  sub load_tmp_file { Line 1536  sub load_tmp_file {
     $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 812  sub upfile_record_sep { Line 1553  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 859  sub record_sep { Line 1605  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 file and specify its type
   
   =cut
   
 sub upfile_select_html {  sub upfile_select_html {
     return (<<'ENDUPFORM');      return (<<'ENDUPFORM');
 <input type="file" name="upfile" size="50">  <input type="file" name="upfile" size="50" />
 <br />Type: <select name="upfiletype">  <br />Type: <select name="upfiletype">
 <option value="csv">CSV (comma separated values, spreadsheet)</option>  <option value="csv">CSV (comma separated values, spreadsheet)</option>
 <option value="space">Space separated</option>  <option value="space">Space separated</option>
Line 872  sub upfile_select_html { Line 1625  sub upfile_select_html {
 ENDUPFORM  ENDUPFORM
 }  }
   
 # ===================Prints a table of sample values from each column uploaded  =pod
 # $r is an Apache Request ref  
 # $records is an arrayref from &Apache::loncommon::upfile_record_sep  =item csv_print_samples($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
   
   =cut
   
 sub csv_print_samples {  sub csv_print_samples {
     my ($r,$records) = @_;      my ($r,$records) = @_;
     my (%sone,%stwo,%sthree);      my (%sone,%stwo,%sthree);
Line 897  sub csv_print_samples { Line 1657  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  =pod
 # $r is an Apache Request ref  
 # $records is an arrayref from &Apache::loncommon::upfile_record_sep  =item csv_print_select_table($r,$records,$d)
 # $d is an array of 2 element arrays (internal name, displayed name)  
   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;
Line 924  sub csv_print_select_table { Line 1691  sub csv_print_select_table {
     return $i;      return $i;
 }  }
   
 # ===================Prints a table of sample values from the upload and  =pod
 #                      can make associate samples to internal names  
 # $r is an Apache Request ref  =item csv_samples_select_table($r,$records,$d)
 # $records is an arrayref from &Apache::loncommon::upfile_record_sep  
 # $d is an array of 2 element arrays (internal name, displayed name)  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;
Line 959  sub csv_samples_select_table { Line 1733  sub csv_samples_select_table {
 1;  1;
 __END__;  __END__;
   
   =pod
   
   =back
   
   =head2 Access .tab File Data
   
   =over 4
   
 =item languageids()   =item languageids() 
   
 returns list of all language ids  returns list of all language ids
Line 997  returns description for a specified file Line 1779  returns description for a specified file
 returns description for a specified file type with  returns description for a specified file type with
 extra formatting  extra formatting
   
   =back
   
   =head2 Alternate Problem Views
   
   =over 4
   
 =item get_previous_attempt()   =item get_previous_attempt() 
   
 return string with previous attempt on problem  return string with previous attempt on problem
Line 1009  show a snapshot of what student was look Line 1797  show a snapshot of what student was look
   
 show a snapshot of how student was answering problem  show a snapshot of how student was answering problem
   
 =item get_unprocessed_cgi()   =back
   
   =head2 HTTP Helper
   
   =over 4
   
   =item get_unprocessed_cgi($query,$possible_names)
   
 get unparsed CGI parameters  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.
   
 =item cacheheader()   =item cacheheader() 
   
 returns cache-controlling header code  returns cache-controlling header code
   
 =item nocache()   =item no_cache($r) 
   
 specifies header code to not have cache  specifies header code to not have cache
   
Removed from v.1.35  
changed lines
  Added in v.1.71

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