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Diff for /loncom/homework/edit.pm between versions 1.12 and 1.106

version 1.12, 2001/06/16 20:33:33 version 1.106, 2007/05/22 01:03:35
Line 1 Line 1
 # The LearningOnline Network with CAPA   # The LearningOnline Network with CAPA 
 # edit mode helpers  # edit mode helpers
 # 3/20 Guy  #
   # $Id$
   #
   # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
   
 package Apache::edit;   package Apache::edit; 
   
 use strict;  use strict;
 use Apache::lonnet;  use Apache::lonnet;
   use HTML::Entities();
   use Apache::lonlocal;
   use lib '/home/httpd/lib/perl/';
   use LONCAPA;
    
   
 # Global Vars  # Global Vars
 # default list of colors to use in editing  # default list of colors to use in editing
 @Apache::edit::colorlist=('#ffffff','#ff0000','#00ff00','#0000ff','#0ff000','#000ff0','#f0000f');  @Apache::edit::colorlist=('#ffffff','#ff0000','#00ff00','#0000ff','#0ff000','#000ff0','#f0000f');
 # depth of nesting of edit  # depth of nesting of edit
 $Apache::edit::colordepth=0;  $Apache::edit::colordepth=0;
   @Apache::edit::inserttag=();
   # image-type responses: active background image and curdepth at definition
   $Apache::edit::bgimgsrc='';
   $Apache::edit::bgimgsrccurdepth='';
   
 sub initialize_edit {  sub initialize_edit {
   $Apache::edit::colordepth=0;      $Apache::edit::colordepth=0;
       @Apache::edit::inserttag=();
 }  }
   
 sub tag_start {  sub tag_start {
   my ($target,$token,$description) = @_;      my ($target,$token,$description) = @_;
   my $result='';      my $result='';
   if ($target eq "edit") {      if ($target eq "edit") {
     my $tag=$token->[1];   my $tag=$token->[1];
     if (!$description) { $description="<$tag>"; }   if (!$description) {
     $result.= &start_table($token)."<tr><td>$description</td>      $description=&Apache::lonxml::description($token);
 <td>Delete:".      if (!$description) { $description="&lt;$tag&gt;"; }
   &deletelist($target,$token)   }
   ."</td>   $result.= &start_table($token)."<tr><td>$description</td>
 <td>".                        <td>Delete".
   &insertlist($target,$token).        &deletelist($target,$token)
     "</td>        ."</td>
 </tr><tr><td colspan=\"3\">\n";                         <td>".
   }         &insertlist($target,$token);
   return $result;  #<td>". 
   #  &movebuttons($target,$token).
   #    "</tr><tr><td colspan=\"3\">\n";
    my @help = Apache::lonxml::helpinfo($token);
    if ($help[0]) {
       $result .= '</td><td align="right" valign="top">' .
    Apache::loncommon::help_open_topic(@help);
    } else { $result .= "</td><td>&nbsp;"; }
    $result .= &end_row().&start_spanning_row();
       }
       return $result;
 }  }
   
 sub tag_end {  sub tag_end {
   my ($target,$token,$description) = @_;      my ($target,$token,$description) = @_;
   my $result='';      my $result='';
   if ($target eq 'edit') {      if ($target eq 'edit') {
     my $tag=$token->[1];   $result.="</td></tr>".&end_table()."\n";
     if (!defined($description)) {  
       $result.="</td></tr><tr><td>&lt;/$tag&gt;";  
     } else {  
       if ($description ne '') { $result.="</td></tr><tr><td>$description"; }  
     }      }
     $result.="</tr>".&end_table()."\n";      return $result;
   }  
   return $result;  
 }  }
   
 sub start_table {  sub start_table {
   my ($token)=@_;      my ($token)=@_;
   my $tag = $token->[1];      my $tag = &Apache::lonxml::get_tag($token);
   my $tagnum;      
   foreach my $namespace (reverse @Apache::lonxml::namespace) {      my $color = $Apache::lonxml::insertlist{"$tag.color"};
     my $testtag=$Apache::lonxml::namespace['-1'].'::'.$tag;      &Apache::lonxml::debug(" $tag -- $color");
     $tagnum=$Apache::lonxml::insertlist{"$testtag.num"};      if (!defined($color)) {
     if (defined($tagnum)) { last; }   $color = $Apache::edit::colorlist[$Apache::edit::colordepth];
   }      }
   if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }      $Apache::edit::colordepth++;
   my $color = $Apache::lonxml::insertlist{"$tagnum.color"};      push(@Apache::edit::inserttag,$token->[1]);
   if (!defined($color)) {      my $result='<div align="right">';
     $color = $Apache::edit::colorlist[$Apache::edit::colordepth];      $result.='<table bgcolor="'.$color.'" width="97%" border="0" cellspacing="5" cellpadding="3">';
   }      return $result;
   $Apache::edit::colordepth++;  
   my $result="<table bgcolor=\"$color\" width=\"100%\" border=\"5\">";  
   return $result;  
 }  }
   
 sub end_table {  sub end_table {
   $Apache::edit::colordepth--;      $Apache::edit::colordepth--;
   my $result="</table>";      my $result='</table></div>';
   return $result;      $result.='<div align="left"><table><tr><td>';
   
       my ($tagname,$closingtag);
       if (defined($Apache::edit::inserttag[-2])) {
    $tagname=$Apache::edit::inserttag[-2];
       } else {
    if ($Apache::lonhomework::parsing_a_task) {
       $tagname='Task';
    } else {
       $tagname='problem';
    }
       }
       if (defined($Apache::edit::inserttag[-1])) {
    $closingtag=$Apache::edit::inserttag[-1];
       }
       $result.=&innerinsertlist('edit',$tagname,$closingtag).
    "</td></tr></table></div>";
       my $last = pop(@Apache::edit::inserttag);
       return $result;
   }
   
   sub start_spanning_row { return '<tr><td colspan="4" bgcolor="#DDDDDD">';}
   sub start_row          { return '<tr><td bgcolor="#DDDDDD">';            }
   sub end_row            { return '</td></tr>';          }
   
   sub movebuttons {
       my ($target,$token) = @_;
       my $result='<input type="submit" name="moveup.'.
    $Apache::lonxml::curdepth.'" value="Move Up" />';
       $result.='<input type="submit" name="movedown.'.
    $Apache::lonxml::curdepth.'" value="Move Down" />';
       return $result;
 }  }
   
 sub deletelist {  sub deletelist {
   my ($target,$token) = @_;      my ($target,$token) = @_;
   my $result = "<select name=\"delete_$Apache::lonxml::curdepth\">      my $result = "<select name=\"delete_$Apache::lonxml::curdepth\">
 <option>Nothing</option>  <option></option>
 <option>Tag</option>  <option>Yes</option>
 <option>Subtags</option>  
 </select>";  </select>";
   return $result;      return $result;
   }
   
   sub handle_delete {
       if (!$env{"form.delete_$Apache::lonxml::curdepth"}) { return ''; }
       my ($space,$target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result=0;
       if ($space) {
    my $sub1="$space\:\:delete_$token->[1]";
    {
       no strict 'refs';
       if (defined &$sub1) {
    $result=&$sub1($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);
       }
    }
       }
       if (!$result) {
    my $endtag='/'.$token->[1];
    my $bodytext=&Apache::lonxml::get_all_text($endtag,$parser,$style);
    $$parser['-1']->get_token();
    &Apache::lonxml::debug("Deleting :$bodytext: for $token->[1]");
    &Apache::lonxml::end_tag($tagstack,$parstack,$token);
       }
       return 1;
 }  }
   
 sub get_insert_list {  sub get_insert_list {
   my ($token) = @_;      my ($tagname) = @_;
   my $result='';      my $result='';
   my @tagnums= ();      my @tags= ();
   #&Apache::lonxml::debug("keys ".join("\n",sort(keys(%Apache::lonxml::insertlist))));      #&Apache::lonxml::debug("keys ".join("\n",sort(keys(%Apache::lonxml::insertlist))));
   if ($Apache::lonxml::insertlist{"$token->[1].which"}) {      if ($Apache::lonxml::insertlist{"$tagname.which"}) {
     push (@tagnums, @{ $Apache::lonxml::insertlist{"$token->[1].which"} });   push (@tags, @{ $Apache::lonxml::insertlist{"$tagname.which"} });
   }      }
   foreach my $namespace (@Apache::lonxml::namespace) {      foreach my $namespace (@Apache::lonxml::namespace) {
     if ($Apache::lonxml::insertlist{"$namespace".'::'."$token->[1].which"}) {   if ($Apache::lonxml::insertlist{"$namespace".'::'."$tagname.which"}) {
       push (@tagnums, @{ $Apache::lonxml::insertlist{"$namespace".'::'."$token->[1].which"} });      push (@tags, @{ $Apache::lonxml::insertlist{"$namespace".'::'."$tagname.which"} });
     }   }
   }      }
   if (@tagnums) {      if (@tags) {
     foreach my $tagnum (@tagnums) {   my %options;
       $result.='<option value="'.$tagnum.'">'.$Apache::lonxml::insertlist{"$tagnum.description"}."</option>\n";   foreach my $tag (@tags) {
     }      my $descrip=$Apache::lonxml::insertlist{"$tag.description"};
     if ($result) { $result='<option selected="on"></option>'.$result; }      my $tagnum =$Apache::lonxml::insertlist{"$tag.num"};
   }      $options{$descrip} ="<option value=\"$tagnum\">".
   return $result;   $descrip."</option>\n";
    }
    foreach my $option (sort(keys(%options))) {$result.=$options{$option};}
    if ($result) { $result='<option selected="selected"></option>'.$result; }
       }
       return $result;
 }  }
   
 sub insertlist {  sub insertlist {
   my ($target,$token) = @_;      my ($target,$token) = @_;
   my $result;      return &innerinsertlist($target,$token->[1]);
   if ($target eq 'edit') {  }
     my $optionlist= &get_insert_list($token);  
     if ($optionlist) {  sub innerinsertlist {
       $result = "Insert:      my ($target,$tagname,$closingtag) = @_;
 <select name=\"insert_$Apache::lonxml::curdepth\">      my $result;
 $optionlist      my $after='';
 </select>"      if ($closingtag) {
     } else {   $after='_after_'.$closingtag; 
       $result="&nbsp;";      }
       if ($target eq 'edit') {
    my $optionlist= &get_insert_list($tagname);
    if ($optionlist) {
       $result = "Insert:
               <select name=\"insert$after\_$Apache::lonxml::curdepth\">
                     $optionlist
               </select>"
    } else {
       $result="&nbsp;";
    }
     }      }
   }      return $result;
   return $result;  
 }  }
   
 sub handle_insert {  sub handle_insert {
   if (!$ENV{"form.insert_$Apache::lonxml::curdepth"}) { return ''; }      if ($env{"form.insert_$Apache::lonxml::curdepth"} eq '') { return ''; }
   my $result;      my $tagnum = $env{"form.insert_$Apache::lonxml::curdepth"};
   my $tagnum = $ENV{"form.insert_$Apache::lonxml::curdepth"};      return &do_insert($tagnum);
   my $func=$Apache::lonxml::insertlist{"$tagnum.function"};  }
   if ($func eq 'default') {  
     my $newtag=$Apache::lonxml::insertlist{"$tagnum.tag"};  sub handle_insertafter {
     my $namespace;      my $tagname=shift;
     if ($newtag =~ /::/) { ($namespace,$newtag) = split(/::/,$newtag); }      if ($env{"form.insert_after_$tagname\_$Apache::lonxml::curdepth"} eq '') {
     $result.="\n<$newtag>\n</$newtag>";   return '';
   } else {  
     {  
       no strict 'refs';  
       $result.=&$func();  
     }      }
   }      my $tagnum =$env{"form.insert_after_$tagname\_$Apache::lonxml::curdepth"};
   return $result;      return &do_insert($tagnum,1);
   }
   
   sub do_insert {
       my ($tagnum,$after) = @_;
       my $result;
   
       my $newtag = $Apache::lonxml::insertlist{"$tagnum.tag"};
       my $func   = $Apache::lonxml::insertlist{"$newtag.function"};
       if ($func eq 'default') {
    my $namespace;
    if ($newtag =~ /::/) { ($namespace,$newtag) = split(/::/,$newtag); }
    my $depth = scalar(@Apache::lonxml::depthcounter);
    $depth -- if ($after);
    my $inset = "\t"x$depth;
    $result.="\n$inset<$newtag>\n$inset</$newtag>";
       } else {
    if (defined(&$func)) {
       {
    no strict 'refs';
    $result.=&$func();
       }
    } else {
       &Apache::lonxml::error("Unable to insert tag $newtag, $func was not defined. ($tagnum)");
    }
       }
       return $result;
   }
   
   sub insert_img {
       return '
       <img />';
   }
   
   sub insert_responseparam {
       return '
       <responseparam />';
   }
   
   sub insert_parameter {
       return '
       <parameter />';
   }
   
   sub insert_formularesponse {
       return '
   <formularesponse answer="" samples="">
       <responseparam description="Numerical Tolerance" type="tolerance" default="0.00001" name="tol" />
       <textline size="25"/>
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </formularesponse>';
   }
   
   sub insert_numericalresponse {
       return '
   <numericalresponse answer="">
   <responseparam type="tolerance" default="5%" name="tol" description="Numerical Tolerance" />
   <responseparam name="sig" type="int_range,0-16" default="0,15" description="Significant Figures" />
       <textline />
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </numericalresponse>';
   }
   
   sub insert_customresponse {
       return '
   <customresponse>
       <answer type="loncapa/perl">
       </answer>
       <textline />
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </customresponse>';
   }
   
   sub insert_customresponse_answer {
       return '
       <answer type="loncapa/perl">
       </answer>
   ';
   }
   
   sub insert_customhint {
       return '
           <customhint>
               <answer type="loncapa/perl">
               </answer>
           </customhint>';
   }
   
   sub insert_customhint_answer {
       return '
               <answer type="loncapa/perl">
               </answer>
   ';
   }
   
   sub insert_mathresponse {
       return '
   <mathresponse>
       <answer>
       </answer>
       <textline />
       <hintgroup>
           <startouttext />
           <endouttext />
       </hintgroup>
   </mathresponse>';
   }
   
   sub insert_mathresponse_answer {
       return '
       <answer>
       </answer>
   ';
   }
   
   sub insert_mathhint {
       return '
           <mathhint>
               <answer>
               </answer>
           </mathhint>';
   }
   
   sub insert_mathhint_answer {
       return '
               <answer>
               </answer>
   ';
   }
   
   sub insert_stringresponse {
       return '
   <stringresponse answer="" type="">
       <textline />
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </stringresponse>';
   }
   
   sub insert_essayresponse {
       return '
   <essayresponse>
       <textfield></textfield>
   </essayresponse>';
   }
   
   sub insert_imageresponse {
       return '
   <imageresponse max="1">
       <foilgroup>
         <foil>
         </foil>
       </foilgroup>
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </imageresponse>';
 }  }
   
 sub insert_optionresponse {  sub insert_optionresponse {
   return '      return '
 <optionresponse max="10">  <optionresponse max="10">
     <foilgroup options="">      <foilgroup options="">
         <foil>
            <startouttext /><endouttext />
         </foil>
     </foilgroup>      </foilgroup>
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
 </optionresponse>';  </optionresponse>';
 }  }
   
 sub editfield {  sub insert_organicresponse {
   my ($tag,$data,$description,$minwidth,$minheight)=@_;      return '
     <organicresponse>
   my $count=0;      <textline />
   my $maxlength=-1;      <hintgroup>
   map { $count++;      <startouttext /><endouttext />
  if (length($_) > $maxlength) { $maxlength = length ($_); }      </hintgroup>
       } split ("\n", $data);  </organicresponse>';
   if ($maxlength > 80) { $maxlength = 80; }  
   if ($maxlength < $minwidth) { $maxlength = $minwidth; }  
   if ( $count < $minheight) { $count = $minheight; }  
   if ($description) {  
     $description="<br />".$description."<br />";  
   }  
   return "$description\n&nbsp;&nbsp;&nbsp;<textarea rows=\"$count\" cols=\"$maxlength\" name=homework_edit_".$Apache::lonxml::curdepth.">$data</textarea>\n";  
 #  return "<br />\n&lt;$tag&gt;<br />\n&nbsp;&nbsp;&nbsp;<textarea rows=\"$count\" cols=\"$maxlength\" name=homework_edit_".$Apache::lonxml::curdepth.">$data</textarea><br />\n&lt;/$tag&gt;<br />\n";  
 }  }
   
 sub modifiedfield {  sub insert_organicstructure {
   my ($token) = @_;      return '
   my $result;  <organicstructure />
 #  foreach my $envkey (sort keys %ENV) {  ';
 #    &Apache::lonxml::debug("$envkey ---- $ENV{$envkey}");  }
 #  }  
 #  &Apache::lonxml::debug("I want homework_edit_$Apache::lonxml::curdepth");  sub insert_radiobuttonresponse {
 #  &Apache::lonxml::debug($ENV{"form.homework_edit_$Apache::lonxml::curdepth"});      return '
   $result=$ENV{"form.homework_edit_$Apache::lonxml::curdepth"};  <radiobuttonresponse max="10">
   if (defined $token) {      <foilgroup>
     if (defined $token->[4]) {        <foil>
       $result=$token->[4].$result;           <startouttext /><endouttext />
     } else {        </foil>
       $result=$result.$token->[2];      </foilgroup>
     }      <hintgroup>
   }      <startouttext /><endouttext />
   return $result;      </hintgroup>
   </radiobuttonresponse>';
   }
   
   sub insert_reactionresponse {
       return '
   <reactionresponse>
       <textline />
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </reactionresponse>';
   }
   
   sub insert_rankresponse {
       return '
   <rankresponse max="10">
       <foilgroup options="">
         <foil>
            <startouttext /><endouttext />
         </foil>
       </foilgroup>
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </rankresponse>';
   }
   
   sub insert_matchresponse {
       return '
   <matchresponse max="10">
       <foilgroup options="">
         <itemgroup>
         </itemgroup>
         <foil>
            <startouttext /><endouttext />
         </foil>
       </foilgroup>
       <hintgroup>
       <startouttext /><endouttext />
       </hintgroup>
   </matchresponse>';
   }
   
   sub insert_displayduedate { return '<displayduedate />'; }
   sub insert_displaytitle   { return '<displaytitle />'; }
   sub insert_hintpart {
       return '
   <hintpart on="default">
       <startouttext/><endouttext />
   </hintpart>';
   }
   
   sub insert_hintgroup {
     return '
   <hintgroup>
       <startouttext /><endouttext />
   </hintgroup>';
   }
   
   sub insert_numericalhint {
       return '
   <numericalhint>
   </numericalhint>';
   }
   
   sub insert_stringhint {
       return '
   <stringhint>
   </stringhint>';
   }
   
   sub insert_formulahint {
       return '
   <formulahint>
   </formulahint>';
   }
   
   sub insert_radiobuttonhint {
       return '
   <radiobuttonhint>
   </radiobuttonhint>';
   }
   
   sub insert_optionhint {
       return '
   <optionhint>
   </optionhint>';
 }  }
   
 sub insert_startouttext {  sub insert_startouttext {
   return "\n<startouttext />\n<endouttext />";      return "<startouttext /><endouttext />";
   }
   
   sub insert_script {
       return "\n<script type=\"loncapa/perl\"></script>";
   }
   
   sub js_change_detection {
       my $unsaved=&mt("There are unsaved changes");
       return (<<SCRIPT);
   <script type="text/javascript">
   var clean = true;
   var is_submit = false;
   var still_ask = false;
   function compareForm(event_) {
           if (!event_ && window.event) {
             event_ = window.event;
           }
    if ((!is_submit || (is_submit && still_ask)) && !clean) {
       still_ask = false;
       is_submit = false;
               event_.returnValue = "$unsaved";
               return "$unsaved";
           }
   }
   function unClean() {
        clean=false;
   }
   window.onbeforeunload = compareForm;
   </script>
   SCRIPT
   }
   
   sub form_change_detection {
       return ' onsubmit="is_submit=true;" ';
   }
   
   sub element_change_detection {
       return ' onchange="unClean();" ';
 }  }
   
 # Returns a 1 if the toekn has been modified and you should rebuild the tag  sub submit_ask_anyway {
       return ' onclick="still_ask=true;" ';
   }
   
   sub textarea_sizes {
       my ($data)=@_;
       my $count=0;
       my $maxlength=-1;
       foreach (split ("\n", $$data)) {
    $count+=int(length($_)/79);
    $count++;
    if (length($_) > $maxlength) { $maxlength = length($_); }
       }
       my $rows = $count;
       my $cols = $maxlength;
       return ($rows,$cols);
   }
   
   sub editline {
       my ($tag,$data,$description,$size)=@_;
       $data=&HTML::Entities::encode($data,'<>&"');
       if ($description) { $description="<br />".$description."<br />"; }
       my $change_code = &element_change_detection();
       my $result = <<"END";
   $description
   <input type="text" name="homework_edit_$Apache::lonxml::curdepth" 
          value="$data" size="$size" $change_code />
   END
       return $result;
   }
   
   sub editfield {
       my ($tag,$data,$description,$minwidth,$minheight,$usehtmlarea)=@_;
   
       my ($rows,$cols)=&textarea_sizes(\$data);
       if (&Apache::lonhtmlcommon::htmlareabrowser() &&
    !&Apache::lonhtmlcommon::htmlareablocked()) {
    $rows+=7;      # make room for HTMLarea
    $minheight+=7; # make room for HTMLarea
       }
       if ($cols > 80) { $cols = 80; }
       if ($cols < $minwidth ) { $cols = $minwidth; }
       if ($rows < $minheight) { $rows = $minheight; }
       if ($description) { $description="<br />".$description."<br />"; }
       if ($usehtmlarea) {
    &Apache::lonhtmlcommon::add_htmlareafields('homework_edit_'.
      $Apache::lonxml::curdepth);
       }
       # remove typesetting whitespace from between data and the end tag
       # to make the edit look prettier
       $data =~ s/\n?[ \t]*$//;
   
       return $description."\n".'<textarea style="width:100%" rows="'.$rows.
    '" cols="'.$cols.'" name="homework_edit_'.
    $Apache::lonxml::curdepth.'" id="homework_edit_'.
    $Apache::lonxml::curdepth.'" '.&element_change_detection().'>'.
    &HTML::Entities::encode($data,'<>&"').'</textarea>'.
    ($usehtmlarea?&Apache::lonhtmlcommon::spelllink('lonhomework',
    'homework_edit_'.$Apache::lonxml::curdepth):'')."\n";
   }
   
   sub modifiedfield {
       my ($endtag,$parser) = @_;
       my $result;
       $result=$env{"form.homework_edit_$Apache::lonxml::curdepth"};
       my $bodytext=&Apache::lonxml::get_all_text($endtag,$parser);
       # textareas throw away intial \n 
       if ($bodytext=~/^\n/) {
    $result="\n".$result;
       }
       # if there is typesetting whitespace from between the data and the end tag
       # restore to keep the source looking pretty
       if ($bodytext =~ /(\n?[ \t]*)$/) {
    $result .= $1;
       }
       return $result;
   }
   
   # Returns a 1 if the token has been modified and you should rebuild the tag
 # side-effects, will modify the $token if new values are found  # side-effects, will modify the $token if new values are found
 sub get_new_args {  sub get_new_args {
   my ($token,$parstack,$safeeval,@args)=@_;      my ($token,$parstack,$safeeval,@args)=@_;
   my $rebuild=0;      my $rebuild=0;
   foreach my $arg (@args) {      foreach my $arg (@args) {
     my $value=&Apache::lonxml::get_param($arg,$parstack,$safeeval);   #just want the string that it was set to
     my $newvalue=$ENV{"form.$Apache::lonxml::curdepth.$arg"};   my $value=$token->[2]->{$arg};
     &Apache::lonxml::debug(" for:$arg: cur is :$value: new is :$newvalue:");   my $element=&html_element_name($arg);
     if ($value ne $newvalue) {   my $newvalue=$env{"form.$element"};
       $token->[2]->{$arg}=$newvalue;   &Apache::lonxml::debug("for:$arg: cur is :$value: new is :$newvalue:");
       $rebuild=1;   if (defined($newvalue) && $value ne $newvalue) {
       if (ref($newvalue) eq 'ARRAY') {
    $token->[2]->{$arg}=join(',',@$newvalue);
       } else {
    $token->[2]->{$arg}=$newvalue;
       }
       $rebuild=1;
    } elsif (!defined($newvalue) && defined($value)) {
       delete($token->[2]->{$arg});
       $rebuild=1;
    }
     }      }
   }      return $rebuild;
   return $rebuild;  
 }  }
   
   # looks for /> on start tags
 sub rebuild_tag {  sub rebuild_tag {
   my ($token) = @_;      my ($token) = @_;
   my $result;      my $result;
   if ($token->[0] eq 'S') {      if ($token->[0] eq 'S') {
     $result = '<'.$token->[1];   $result = '<'.$token->[1];
     while (my ($key,$val)= each(%{$token->[2]})) {   while (my ($key,$val)= each(%{$token->[2]})) {
       &Apache::lonxml::debug("setting :$key: to  :$val:");      $val=~s:^\s+|\s+$::g;
       $result.=' '.$key.'="'.$val.'"';      $val=~s:"::g; #"
     }      &Apache::lonxml::debug("setting :$key: to  :$val:");
     $result.=">";      $result.=' '.$key.'="'.$val.'"';
   } elsif ( $token->[0] eq 'E' ) {   }
     $result = '</'.$token->[1].'>';   if ($token->[4] =~ m:/>$:) {
   }      $result.=' />';
   return $result;   } else {
       $result.='>';
    }
       } elsif ( $token->[0] eq 'E' ) {
    $result = '</'.$token->[1].'>';
       }
       return $result;
   }
   
   sub html_element_name {
       my ($name) = @_;
       return $name.'_'.$Apache::lonxml::curdepth;
   }
   
   sub hidden_arg {
       my ($name,$token) = @_;
       my $result;
       my $arg=$token->[2]{$name};
       $result='<input name="'.&html_element_name($name).
    '" type="hidden" value="'.$arg.'" />';
       return $result;
   }
   
   sub checked_arg {
       my ($description,$name,$list,$token) = @_;
       my $result;
       my $optionlist="";
       my $allselected=$token->[2]{$name};
       $result=&mt($description);
       foreach my $option (@$list) {
    my ($value,$text);
    if ( ref($option) eq 'ARRAY') {
       $value='value="'.$$option[0].'"';
       $text=$$option[1];
       $option=$$option[0];
    } else {
       $text=$option;
       $value='value="'.$option.'"';
    }
    $result.="<nobr><label><input type='checkbox' $value name='".
       &html_element_name($name)."'";
    foreach my $selected (split(/,/,$allselected)) {
       if ( $selected eq $option ) {
    $result.=" checked='checked' ";
    last;
       }
    }
    $result.=&element_change_detection()." />$text</label></nobr>\n";
       }
       return $result;
   }
   
   sub text_arg {
       my ($description,$name,$token,$size) = @_;
       my $result;
       if (!defined $size) { $size=20; }
       my $arg=$token->[2]{$name};
       $result=&mt($description).'&nbsp;<input name="'.&html_element_name($name).
    '" type="text" value="'.$arg.'" size="'.$size.'" '.
    &element_change_detection().'/>';
       return '<nobr>'.$result.'</nobr>';
   }
   
   sub select_arg {
       my ($description,$name,$list,$token) = @_;
       my $result;
       my $optionlist="";
       my $selected=$token->[2]{$name};
       foreach my $option (@$list) {
    my ($text,$value);
    if ( ref($option) eq 'ARRAY') {
       $value='value="'.&HTML::Entities::encode($$option[0]).'"';
       $text=$$option[1];
       $option=$$option[0];
    } else {
       $text=$option;
       $value='value="'.&HTML::Entities::encode($option,'\'"&<>').'"';
    }
    if ( $selected eq $option ) {
       $optionlist.="<option $value selected=\"selected\">$text</option>\n";
    } else {
       $optionlist.="<option $value >$text</option>\n";
    }
       }
       $result.='<nobr>'.$description.'&nbsp;<select name="'.
    &html_element_name($name).'" '.&element_change_detection().' >
          '.$optionlist.'
         </select></nobr>';
       return $result;
   }
   
   sub select_or_text_arg {
       my ($description,$name,$list,$token,$size) = @_;
       my $result;
       my $optionlist="";
       my $found=0;
       my $selected=$token->[2]{$name};
       foreach my $option (@$list) {
    my ($text,$value);
    if ( ref($option) eq 'ARRAY') {
       $value='value="'.&HTML::Entities::encode($$option[0]).'"';
       $text=$$option[1];
       $option=$$option[0];
    } else {
       $text=$option;
       $value='value="'.&HTML::Entities::encode($option,'\'"&<>').'"';
    }
    if ( $selected eq $option ) {
       $optionlist.="<option $value selected=\"selected\">$text</option>\n";
       $found=1;
    } else {
       $optionlist.="<option $value>$text</option>\n";
    }
       }
       $optionlist.="<option value=\"TYPEDINVALUE\"".
     ((!$found)?' selected="selected"':'').
     ">".&mt('Type-in value')."</option>\n";
   #
       my $change_code=&element_change_detection();
       my $element=&html_element_name($name);
       my $selectelement='select_list_'.$element;
       my $typeinelement='type_in_'.$element;
       my $typeinvalue=($found?'':$selected);
   #
       my $hiddenvalue='this.form.'.$element.'.value';
       my $selectedindex='this.form.'.$selectelement.'.selectedIndex';
       my $selectedvalue='this.form.'.$selectelement.
        '.options['.$selectedindex.'].value';
       my $typedinvalue='this.form.'.$typeinelement.'.value';
       my $selecttypeinindex='this.form.'.$selectelement.'.options.length';
       $description=&mt($description);
   #
       return (<<ENDSELECTORTYPE);
   <nobr>
   $description
   &nbsp;<select name="$selectelement"
   onChange="if ($selectedvalue!='TYPEDINVALUE') { $hiddenvalue=$selectedvalue; $typedinvalue=''; }" >
   $optionlist
   </select>
   <input type="text" size="$size" name="$typeinelement"
          value="$typeinvalue" 
   onChange="$hiddenvalue=$typedinvalue;"
   onFocus="$selectedindex=$selecttypeinindex-1;" />
   <input type="hidden" name="$element" value="$selected" $change_code />
   </nobr>
   ENDSELECTORTYPE
   }
   
   #----------------------------------------------------- image coordinates
   # single image coordinates, x, y 
   sub entercoords {
       my ($idx,$idy,$mode,$width,$height) = @_;
       unless ($Apache::edit::bgimgsrc) { return ''; }
       if ($idx) { $idx.='_'; }
       if ($idy) { $idy.='_'; }
       my $bgfile=&escape(&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$Apache::edit::bgimgsrc));
       my $form    = 'lonhomework';
       my $element;
       if (! defined($mode) || $mode eq 'attribute') {
           $element = &escape("$Apache::lonxml::curdepth");
       } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
           $element = &escape('homework_edit_'.
                                              $Apache::lonxml::curdepth);
       }
       my $id=$Apache::lonxml::curdepth;
       my %data=("imagechoice.$id.type"      =>'point',
         "imagechoice.$id.formname"  =>$form,
         "imagechoice.$id.formx"     =>"$idx$element",
         "imagechoice.$id.formy"     =>"$idy$element",
         "imagechoice.$id.file"      =>$bgfile,
         "imagechoice.$id.formcoord" =>$element);
       if ($height) {
    $data{"imagechoice.$id.formheight"}=$height.'_'.
       $Apache::edit::bgimgsrccurdepth;
       }
       if ($width) {
    $data{"imagechoice.$id.formwidth"}=$width.'_'.
       $Apache::edit::bgimgsrccurdepth;
       }
       &Apache::lonnet::appenv(%data);
       my $text="Click Coordinates";
       my $result='<a href="/adm/imagechoice?token='.$id.'" target="imagechoice">'.$text.'</a>';
       return $result;
   }
   
   # coordinates (x1,y1)-(x2,y2)...
   # mode can be either box, or polygon
   sub entercoord {
       my ($idx,$mode,$width,$height,$type) = @_;
       unless ($Apache::edit::bgimgsrc) { return ''; }
       my $bgfile=&escape(&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$Apache::edit::bgimgsrc));
       my $form    = 'lonhomework';
       my $element;
       if (! defined($mode) || $mode eq 'attribute') {
           $element = &escape("$idx\_$Apache::lonxml::curdepth");
       } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
           $element = &escape('homework_edit_'.
                                              $Apache::lonxml::curdepth);
       }
       my $id=$Apache::lonxml::curdepth;
       my %data=("imagechoice.$id.type"      =>$type,
         "imagechoice.$id.formname"  =>$form,
         "imagechoice.$id.file"      =>$bgfile,
         "imagechoice.$id.formcoord" =>$element);
       if ($height) {
    $data{"imagechoice.$id.formheight"}=$height.'_'.
       $Apache::edit::bgimgsrccurdepth;
       }
       if ($width) {
    $data{"imagechoice.$id.formwidth"}=$width.'_'.
       $Apache::edit::bgimgsrccurdepth;
       }
       &Apache::lonnet::appenv(%data);
       my $text="Enter Coordinates";
       if ($type eq 'polygon') { $text='Create Polygon Data'; }
       my $result='<a href="/adm/imagechoice?token='.$id.'" target="imagechoice">'.$text.'</a>';
       return $result;
   }
   
   sub deletecoorddata {
       &Apache::lonnet::delenv("imagechoice\\.");
   }
   
   #----------------------------------------------------- browse
   sub browse {
       # insert a link to call up the filesystem browser (lonindexer)
       my ($id, $mode, $titleid) = @_;
       my $form    = 'lonhomework';
       my $element;
       if (! defined($mode) || $mode eq 'attribute') {
           $element = &escape("$id\_$Apache::lonxml::curdepth");
       } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
           $element = &escape('homework_edit_'.
                                              $Apache::lonxml::curdepth);
       }
       my $titleelement;
       if ($titleid) {
    $titleelement=",'','','".&escape("$titleid\_$Apache::lonxml::curdepth")."'";
       }
       my $result = <<"ENDBUTTON";
   <a href=\"javascript:openbrowser('$form','$element'$titleelement)\"\>Select</a>
   ENDBUTTON
       return $result;
   }
   
   #----------------------------------------------------- browse
   sub search {
       # insert a link to call up the filesystem browser (lonindexer)
       my ($id, $mode, $titleid) = @_;
       my $form    = 'lonhomework';
       my $element;
       if (! defined($mode) || $mode eq 'attribute') {
           $element = &escape("$id\_$Apache::lonxml::curdepth");
       } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
           $element = &escape('homework_edit_'.
                                              $Apache::lonxml::curdepth);
       }
       my $titleelement;
       if ($titleid) {
    $titleelement=",'".&escape("$titleid\_$Apache::lonxml::curdepth")."'";
       }
       my $result = <<"ENDBUTTON";
   <a href=\"javascript:opensearcher('$form','$element'$titleelement)\"\>Search</a>
   ENDBUTTON
       return $result;
 }  }
   
   
 1;  1;
 __END__  __END__
   
   =head1 NAME
   
   Apache::edit - edit mode helpers
   
   =head1 SYNOPSIS
   
   Invoked by many homework and xml related modules.
   
    &Apache::edit::SUBROUTINENAME(ARGUMENTS);
   
   =head1 INTRODUCTION
   
   This module outputs HTML syntax helpful for the rendering of edit
   mode interfaces.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 HANDLER SUBROUTINE
   
   There is no handler subroutine.
   
   =head1 OTHER SUBROUTINES
   
   =over 4
   
   =item *
   
   initialize_edit() : initialize edit (set colordepth to zero)
   
   =item *
   
   tag_start($target,$token,$description) : provide deletion and insertion lists
   for the manipulation of a start tag; return a scalar string
   
   =item *
   
   tag_end($target,$token,$description) : ending syntax corresponding to
   &tag_start. return a scalar string.
   
   =item *
   
   start_table($token) : start table; update colordepth; return scalar string.
   
   =item *
   
   end_table() : reduce color depth; end table; return scalar string
   
   =item *
   
   start_spanning_row() : start a new table row spanning the 'edit' environment.
   
   =item *
   
   start_row() : start a new table row and element. 
   
   =item *
   
   end_row() : end current table element and row.
   
   =item *
   
   movebuttons($target,$token) : move-up and move-down buttons; return scalar
   string
   
   =item *
   
   deletelist($target,$token) : provide a yes option in an HTML select element;
   return scalar string
   
   =item *
   
   handle_delete($space,$target,$token,$tagstack,$parstack,$parser,$safeeval,
   $style) : respond to a user delete request by passing relevant stack
   and array information to various rendering functions; return a scalar string
   
   =item *
   
   get_insert_list($token) : provide an insertion list based on possibilities
   from lonxml; return a scalar string
   
   =item *
   
   insertlist($target,$token) : api that uses get_insert_list;
   return a scalar string
   
   =item *
   
   handleinsert($token) : provide an insertion list based on possibilities
   from lonxml; return a scalar string
   
   =item *
   
   get_insert_list($token) : provide an insertion list based on possibilities
   from lonxml; return a scalar string
   
   =item *
   browse($elementname) : provide a link which will open up the filesystem
   browser (lonindexer) and, once a file is selected, place the result in
   the form element $elementname.
   
   =item *
   search($elementname) : provide a link which will open up the filesystem
   searcher (lonsearchcat) and, once a file is selected, place the result in
   the form element $elementname.
   
   =item *
   editline(tag,data,description,size): Provide a <input type="text" ../> for
   single-line text entry.  This is to be used for text enclosed by tags, not
   arguements/parameters associated with a tag.
   
   =back
   
   incomplete...
   
   =cut
Removed from v.1.12  
changed lines
  Added in v.1.106

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