--- loncom/homework/edit.pm	2001/11/07 21:24:15	1.23
+++ loncom/homework/edit.pm	2003/06/10 18:39:08	1.55
@@ -1,19 +1,52 @@
 # The LearningOnline Network with CAPA 
 # edit mode helpers
+#
+# $Id: edit.pm,v 1.55 2003/06/10 18:39:08 albertel Exp $
+#
+# 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/
+#
 # 3/20 Guy
+# 01/10/02 Matthew
+# 03/06/02 Matthew
 package Apache::edit; 
 
 use strict;
-use Apache::lonnet;
+use Apache::lonnet();
+use HTML::Entities();
 
 # Global Vars
 # default list of colors to use in editing
 @Apache::edit::colorlist=('#ffffff','#ff0000','#00ff00','#0000ff','#0ff000','#000ff0','#f0000f');
 # depth of nesting of edit
 $Apache::edit::colordepth=0;
+@Apache::edit::inserttag=();
+# image-type responses: active background image and curdepth at definition
+$Apache::edit::bgimgsrc='';
+$Apache::edit::bgimgsrccurdepth='';
 
 sub initialize_edit {
   $Apache::edit::colordepth=0;
+  @Apache::edit::inserttag=();
 }
 
 sub tag_start {
@@ -30,10 +63,8 @@ sub tag_start {
   &deletelist($target,$token)
   ."</td>
 <td>".
-  &insertlist($target,$token).
-    "</td>
-</tr><tr><td colspan=\"3\">\n";
-#<td>".
+    &insertlist($target,$token).&end_row().&start_spanning_row();
+#<td>". 
 #  &movebuttons($target,$token).
 #    "</tr><tr><td colspan=\"3\">\n";
   }
@@ -44,13 +75,7 @@ sub tag_end {
   my ($target,$token,$description) = @_;
   my $result='';
   if ($target eq 'edit') {
-    my $tag=$token->[1];
-    if (!defined($description)) {
-      $result.="</td></tr><tr><td>&lt;/$tag&gt;</td><td colspan=\"2\">&nbsp;</td>";
-    } else {
-      if ($description ne '') { $result.="</td></tr><tr><td>$description</td><td colspan=\"2\">&nbsp;</td>"; }
-    }
-    $result.="</tr>".&end_table()."\n";
+    $result.="</td></tr>".&end_table()."\n";
   }
   return $result;
 }
@@ -70,16 +95,34 @@ sub start_table {
     $color = $Apache::edit::colorlist[$Apache::edit::colordepth];
   }
   $Apache::edit::colordepth++;
-  my $result="<table bgcolor=\"$color\" width=\"100%\" border=\"5\">";
+  push(@Apache::edit::inserttag,$token->[1]);
+  my $result='<div align="right">';
+  $result.='<table bgcolor="'.$color.'" width="97%" border="0" cellspacing="5" cellpadding="3">';
   return $result;
 }
 
 sub end_table {
   $Apache::edit::colordepth--;
-  my $result="</table>";
+  my $result='</table></div>';
+  $result.="<table><tr><td>";
+
+  my ($tagname,$closingtag);
+  if (defined($Apache::edit::inserttag[-2])) {
+    $tagname=$Apache::edit::inserttag[-2];
+  } else {$tagname='problem';}
+  if (defined($Apache::edit::inserttag[-1])) {
+    $closingtag=$Apache::edit::inserttag[-1];
+  }
+  $result.=&innerinsertlist('edit',$tagname,$closingtag).
+    "</td></tr></table>";
+  pop(@Apache::edit::inserttag);
   return $result;
 }
 
+sub start_spanning_row { return '<tr><td colspan="3" bgcolor="#DDDDDD">';}
+sub start_row          { return '<tr><td bgcolor="#DDDDDD">';            }
+sub end_row            { return '</td></tr>';          }
+
 sub movebuttons {
   my ($target,$token) = @_;
   my $result='<input type="submit" name="moveup.'.
@@ -113,7 +156,7 @@ sub handle_delete {
   }
   if (!$result) {
     my $endtag='/'.$token->[1];
-    my $bodytext=&Apache::lonxml::get_all_text($endtag,$$parser[$#$parser]);
+    my $bodytext=&Apache::lonxml::get_all_text($endtag,$parser);
     $$parser['-1']->get_token();
     &Apache::lonxml::debug("Deleting :$bodytext: for $token->[1]");
     &Apache::lonxml::end_tag($tagstack,$parstack,$token);
@@ -122,22 +165,25 @@ sub handle_delete {
 }
 
 sub get_insert_list {
-  my ($token) = @_;
+  my ($tagname) = @_;
   my $result='';
   my @tagnums= ();
   #&Apache::lonxml::debug("keys ".join("\n",sort(keys(%Apache::lonxml::insertlist))));
-  if ($Apache::lonxml::insertlist{"$token->[1].which"}) {
-    push (@tagnums, @{ $Apache::lonxml::insertlist{"$token->[1].which"} });
+  if ($Apache::lonxml::insertlist{"$tagname.which"}) {
+    push (@tagnums, @{ $Apache::lonxml::insertlist{"$tagname.which"} });
   }
   foreach my $namespace (@Apache::lonxml::namespace) {
-    if ($Apache::lonxml::insertlist{"$namespace".'::'."$token->[1].which"}) {
-      push (@tagnums, @{ $Apache::lonxml::insertlist{"$namespace".'::'."$token->[1].which"} });
+    if ($Apache::lonxml::insertlist{"$namespace".'::'."$tagname.which"}) {
+      push (@tagnums, @{ $Apache::lonxml::insertlist{"$namespace".'::'."$tagname.which"} });
     }
   }
   if (@tagnums) {
+    my %options;
     foreach my $tagnum (@tagnums) {
-      $result.='<option value="'.$tagnum.'">'.$Apache::lonxml::insertlist{"$tagnum.description"}."</option>\n";
+      my $descrip=$Apache::lonxml::insertlist{"$tagnum.description"};
+      $options{$descrip} ="<option value=\"$tagnum\">".$descrip."</option>\n";
     }
+    foreach my $option (sort(keys(%options))) { $result.=$options{$option}; }
     if ($result) { $result='<option selected="on"></option>'.$result; }
   }
   return $result;
@@ -145,12 +191,21 @@ sub get_insert_list {
 
 sub insertlist {
   my ($target,$token) = @_;
+  return &innerinsertlist($target,$token->[1]);
+}
+
+sub innerinsertlist {
+  my ($target,$tagname,$closingtag) = @_;
   my $result;
+  my $after='';
+  if ($closingtag) {
+     $after='_after_'.$closingtag; 
+  }
   if ($target eq 'edit') {
-    my $optionlist= &get_insert_list($token);
+    my $optionlist= &get_insert_list($tagname);
     if ($optionlist) {
       $result = "Insert:
-<select name=\"insert_$Apache::lonxml::curdepth\">
+<select name=\"insert$after\_$Apache::lonxml::curdepth\">
 $optionlist
 </select>"
     } else {
@@ -184,11 +239,46 @@ sub handle_insert {
   return $result;
 }
 
+sub handle_insertafter {
+  my $tagname=shift;
+  if ($ENV{"form.insert_after_$tagname\_$Apache::lonxml::curdepth"} eq '')
+     { return ''; }
+  my $result;
+  my $tagnum =$ENV{"form.insert_after_$tagname\_$Apache::lonxml::curdepth"};
+  my $func=$Apache::lonxml::insertlist{"$tagnum.function"};
+  if ($func eq 'default') {
+    my $newtag=$Apache::lonxml::insertlist{"$tagnum.tag"};
+    my $namespace;
+    if ($newtag =~ /::/) { ($namespace,$newtag) = split(/::/,$newtag); }
+    $result.="\n<$newtag>\n</$newtag>";
+  } else {
+    if (defined(&$func)) {
+      {
+	no strict 'refs';
+	$result.=&$func();
+      }
+    } else {
+      my $newtag=$Apache::lonxml::insertlist{"$tagnum.tag"};
+      &Apache::lonxml::error("Unable to insert (after) tag $newtag, $func was not defined. ($tagname $tagnum)");
+    }
+  }
+  return $result;
+}
+
 sub insert_responseparam {
   return '
     <responseparam />';
 }
 
+sub insert_formularesponse {
+  return '
+<formularesponse answer="" samples="">
+    <textline />
+    <hintgroup>
+    </hintgroup>
+</formularesponse>';
+}
+
 sub insert_numericalresponse {
   return '
 <numericalresponse answer="">
@@ -207,6 +297,23 @@ sub insert_stringresponse {
 </stringresponse>';
 }
 
+sub insert_essayresponse {
+  return '
+<essayresponse>
+    <textfield></textfield>
+</essayresponse>';
+}
+
+sub insert_imageresponse {
+  return '
+<imageresponse max="1">
+    <foilgroup>
+    </foilgroup>
+    <hintgroup>
+    </hintgroup>
+</imageresponse>';
+}
+
 sub insert_optionresponse {
   return '
 <optionresponse max="10">
@@ -227,6 +334,28 @@ sub insert_radiobuttonresponse {
 </radiobuttonresponse>';
 }
 
+sub insert_rankresponse {
+  return '
+<rankresponse max="10">
+    <foilgroup options="">
+    </foilgroup>
+    <hintgroup>
+    </hintgroup>
+</rankresponse>';
+}
+
+sub insert_matchresponse {
+  return '
+<matchresponse max="10">
+    <foilgroup options="">
+      <itemgroup>
+      </itemgroup>
+    </foilgroup>
+    <hintgroup>
+    </hintgroup>
+</matchresponse>';
+}
+
 sub insert_displayduedate { return '<displayduedate />'; }
 sub insert_displaytitle   { return '<displaytitle />'; }
 sub insert_hintpart {
@@ -243,6 +372,30 @@ sub insert_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 {
   return "<startouttext />\n<endouttext />";
 }
@@ -251,22 +404,43 @@ sub insert_script {
   return "\n<script type=\"loncapa/perl\">\n</script>";
 }
 
+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 $result = <<"END";
+$description
+<input type="text" name="homework_edit_$Apache::lonxml::curdepth" 
+       value="$data" size="$size" />
+END
+    return $result;
+}
+
 sub editfield {
   my ($tag,$data,$description,$minwidth,$minheight)=@_;
 
-  my $count=0;
-  my $maxlength=-1;
-  map { $count++;
-	if (length($_) > $maxlength) { $maxlength = length ($_); }
-      } split ("\n", $data);
-  if ($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;/$tag&gt;<br />\n";
+  my ($rows,$cols)=&textarea_sizes(\$data);
+  if ($cols > 80) { $cols = 80; }
+  if ($cols < $minwidth ) { $cols = $minwidth; }
+  if ($rows < $minheight) { $rows = $minheight; }
+  if ($description) { $description="<br />".$description."<br />"; }
+  return $description."\n".'&nbsp;&nbsp;&nbsp;<textarea rows="'.$rows.
+    '" cols="'.$cols.'" name="homework_edit_'.$Apache::lonxml::curdepth.'">'.
+      &HTML::Entities::encode($data).'</textarea>'."\n";
 }
 
 sub modifiedfield {
@@ -278,13 +452,6 @@ sub modifiedfield {
 #  &Apache::lonxml::debug("I want homework_edit_$Apache::lonxml::curdepth");
 #  &Apache::lonxml::debug($ENV{"form.homework_edit_$Apache::lonxml::curdepth"});
   $result=$ENV{"form.homework_edit_$Apache::lonxml::curdepth"};
-  if (defined $token) {
-    if (defined $token->[4]) {
-      $result=$token->[4].$result;
-    } else {
-      $result=$result.$token->[2];
-    }
-  }
   return $result;
 }
 
@@ -296,9 +463,10 @@ sub get_new_args {
   foreach my $arg (@args) {
     #just want the string that it was set to
     my $value=$token->[2]->{$arg};
-    my $newvalue=$ENV{"form.$Apache::lonxml::curdepth.$arg"};
+    my $element=&html_element_name($arg);
+    my $newvalue=$ENV{"form.$element"};
     &Apache::lonxml::debug(" for:$arg: cur is :$value: new is :$newvalue:");
-    if ($value ne $newvalue) {
+    if (defined($newvalue) && $value ne $newvalue) {
       $token->[2]->{$arg}=$newvalue;
       $rebuild=1;
     }
@@ -329,57 +497,300 @@ sub rebuild_tag {
   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 $result;
+}
+
 sub text_arg {
   my ($description,$name,$token,$size) = @_;
   my $result;
   if (!defined $size) { $size=20; }
   my $arg=$token->[2]{$name};
-  $result=$description.'<input name="'."$Apache::lonxml::curdepth.$name".
+  $result=$description.'&nbsp;<input name="'.&html_element_name($name).
     '" type="text" value="'.$arg.'" size="'.$size.'" />';
   return $result;
 }
 
 sub select_arg {
-  my ($description,$name,$list,$token) = @_;
-  my $result;
-  my $optionlist="";
-  my $selected=$token->[2]{$name};
-  foreach my $option (@$list) {
-    if ( $selected eq $option ) {
-      $optionlist.="<option selected=\"on\">$option</option>\n";
-    } else {
-      $optionlist.="<option>$option</option>\n";
+    my ($description,$name,$list,$token) = @_;
+    my $result;
+    my $optionlist="";
+    my $selected=$token->[2]{$name};
+    foreach my $option (@$list) {
+	my $value;
+	if ( ref($option) eq 'ARRAY') {
+	    $value='value="'.$$option[0].'"';
+	    $option=$$option[1];
+	} else {
+	    $value='value="'.$option.'"';
+	}
+	if ( $selected eq $option ) {
+	    $optionlist.="<option $value selected=\"on\">$option</option>\n";
+	} else {
+	    $optionlist.="<option $value >$option</option>\n";
+	}
     }
-  }
-  $result.=$description.'<select name="'."$Apache::lonxml::curdepth.$name".'">
+    $result.=$description.'&nbsp;<select name="'.&html_element_name($name).
+        '">
        '.$optionlist.'
-      </select></td></tr><tr><td colspan="3">';
-  return $result;
+      </select>';
+    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) {
-    if ( $selected eq $option ) {
-      $optionlist.="<option selected=\"on\">$option</option>\n";
-      $found=1;
+    my ($description,$name,$list,$token,$size) = @_;
+    my $result;
+    my $optionlist="";
+    my $found=0;
+    my $selected=$token->[2]{$name};
+    foreach my $option (@$list) {
+	my $value;
+	if ( ref($option) eq 'ARRAY') {
+	    $value='value="'.$$option[0].'"';
+	    $option=$$option[1];
+	} else {
+	    $value='value="'.$option.'"';
+	}
+	if ( $selected eq $option ) {
+	    $optionlist.="<option $value selected=\"on\">$option</option>\n";
+	    $found=1;
+	} else {
+	    $optionlist.="<option $value>$option</option>\n";
+	}
+    }
+    $optionlist.="<option value=\"TYPEDINVALUE\">Type in value</option>\n";
+    if (($found) || (!$selected)) {
+	$result.=$description.'&nbsp;<select name="'.&html_element_name($name)
+            .'">
+       '.$optionlist.'
+      </select>';
     } else {
-      $optionlist.="<option>$option</option>\n";
+	$result.=&text_arg($description,$name,$token,$size);
     }
-  }
-  $optionlist.="<option value=\"TYPEDINVALUE\">Type in value</option>\n";
-  if ($found) {
-    $result.=$description.'<select name="'."$Apache::lonxml::curdepth.$name".'">
-       '.$optionlist.'
-      </select></td></tr><tr><td colspan="3">';
-  } else {
-    $result.=&text_arg($description,$name,$token,$size);
-  }
-  return $result;
+    return $result;
+}
+
+#----------------------------------------------------- image coordinates
+# single image coordinates, x, y 
+sub entercoords {
+    my ($idx,,$idy,$mode,$width,$height) = @_;
+    unless ($Apache::edit::bgimgsrc) { return ''; }
+    if ($idx) { $idx.='_'; }
+    if ($idy) { $idy.='_'; }
+    my $bgfile=&Apache::lonnet::escape($Apache::edit::bgimgsrc);
+    my $form    = 'lonhomework';
+    my $element;
+    if (! defined($mode) || $mode eq 'attribute') {
+        $element = &Apache::lonnet::escape("$Apache::lonxml::curdepth");
+    } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
+        $element = &Apache::lonnet::escape('homework_edit_'.
+                                           $Apache::lonxml::curdepth);
+    }
+    my $formheight='';
+    if ($height) {
+	$formheight='&formheight='.$height.'_'.$Apache::edit::bgimgsrccurdepth;
+    }
+    my $formwidth='';
+    if ($width) {
+	$formwidth='&formwidth='.$width.'_'.$Apache::edit::bgimgsrccurdepth;
+    }
+    my $result = <<"ENDBUTTON";
+<a href="/cgi-bin/imagechoice.pl?formname=$form&file=$bgfile&formx=$idx$element&formy=$idy$element$formheight$formwidth"
+target="imagechoice">Click Coordinates</a>
+ENDBUTTON
+    return $result;
+}
+
+# coordinate pair (x1,y1)-(x2,y2)
+sub entercoordpair {
+    my ($id,$mode,$width,$height) = @_;
+    unless ($Apache::edit::bgimgsrc) { return ''; }
+    my $bgfile=&Apache::lonnet::escape($Apache::edit::bgimgsrc);
+    my $form    = 'lonhomework';
+    my $element;
+    if (! defined($mode) || $mode eq 'attribute') {
+        $element = &Apache::lonnet::escape("$id\_$Apache::lonxml::curdepth");
+    } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
+        $element = &Apache::lonnet::escape('homework_edit_'.
+                                           $Apache::lonxml::curdepth);
+    }
+    my $formheight='';
+    if ($height) {
+	$formheight='&formheight='.$height.'_'.$Apache::edit::bgimgsrccurdepth;
+    }
+    my $formwidth='';
+    if ($width) {
+	$formwidth='&formwidth='.$width.'_'.$Apache::edit::bgimgsrccurdepth;
+    }
+    my $result = <<"ENDBUTTON";
+<a href="/cgi-bin/imagechoice.pl?mode=pair&formname=$form&file=$bgfile$formheight$formwidth&formcoord=$element"
+target="imagechoice">Click Coordinate Pair</a>
+ENDBUTTON
+    return $result;
+}
+#----------------------------------------------------- browse
+sub browse {
+    # insert a link to call up the filesystem browser (lonindexer)
+    my ($id, $mode) = @_;
+    my $form    = 'lonhomework';
+    my $element;
+    if (! defined($mode) || $mode eq 'attribute') {
+        $element = &Apache::lonnet::escape("$id\_$Apache::lonxml::curdepth");
+    } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
+        $element = &Apache::lonnet::escape('homework_edit_'.
+                                           $Apache::lonxml::curdepth);
+    }
+    my $result = <<"ENDBUTTON";
+<a href=\"javascript:openbrowser('$form','$element')\"\>Browse</a>
+ENDBUTTON
+    return $result;
+}
+
+#----------------------------------------------------- browse
+sub search {
+    # insert a link to call up the filesystem browser (lonindexer)
+    my ($id, $mode) = @_;
+    my $form    = 'lonhomework';
+    my $element;
+    if (! defined($mode) || $mode eq 'attribute') {
+        $element = &Apache::lonnet::escape("$id\_$Apache::lonxml::curdepth");
+    } elsif ($mode eq 'textnode') {  # for data between <tag> ... </tag>
+        $element = &Apache::lonnet::escape('homework_edit_'.
+                                           $Apache::lonxml::curdepth);
+    }
+    my $result = <<"ENDBUTTON";
+<a href=\"javascript:opensearcher('$form','$element')\"\>Search</a>
+ENDBUTTON
+    return $result;
 }
+
+
 1;
 __END__
+
+=head1 NAME
+
+Apache::edit - edit mode helpers
+
+=head1 SYNOPSIS
+
+Invoked by many homework and xml related modules.
+
+ &Apache::edit::SUBROUTINENAME(ARGUMENTS);
+
+=head1 INTRODUCTION
+
+This module outputs HTML syntax helpful for the rendering of edit
+mode interfaces.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 HANDLER SUBROUTINE
+
+There is no handler subroutine.
+
+=head1 OTHER SUBROUTINES
+
+=over 4
+
+=item *
+
+initialize_edit() : initialize edit (set colordepth to zero)
+
+=item *
+
+tag_start($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