--- loncom/homework/structuretags.pm	2000/12/29 21:54:06	1.25
+++ loncom/homework/structuretags.pm	2011/12/10 17:53:45	1.498
@@ -1,300 +1,2414 @@
-# The LearningOnline Network with CAPA # <script> definiton
+# The LearningOnline Network with CAPA 
+# definition of tags that give a structure to a document
+#
+# $Id: structuretags.pm,v 1.498 2011/12/10 17:53:45 raeburn 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/
+#
+###
+
+=pod
+
+=head1 NAME
+
+Apache::structuretags
+
+=head1 SYNOPSIS
+
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+
+=head1 NOTABLE SUBROUTINES
+
+=over
+
+=item 
+
+=back
+
+=cut
+
 
 package Apache::structuretags; 
 
 use strict;
 use Apache::lonnet;
-
-sub BEGIN {
-  &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','web','tex','part','preduedate','postanswerdate','solved','notsolved'));
+use Apache::File();
+use Apache::lonmenu;
+use Apache::lonlocal;
+use Apache::lonxml;
+use Apache::londefdef;
+use Apache::lonenc();
+use Time::HiRes qw( gettimeofday tv_interval );
+use lib '/home/httpd/lib/perl/';
+use LONCAPA;
+ 
+BEGIN {
+    &Apache::lonxml::register('Apache::structuretags',('block','languageblock','translated','instructorcomment','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','problemtype','startpartmarker','startouttext','endpartmarker','endouttext','simpleeditbutton','definetag'));
 }
 
 sub start_web {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
-  if ($target eq 'web') {
-    return $bodytext;
-  } 
-  return '';
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    if ($target ne 'edit' && $target ne 'modified') {
+	my $bodytext=&Apache::lonxml::get_all_text("/web",$parser,$style);
+	if ($target eq 'web' || $target eq 'webgrade') {
+	    return $bodytext;
+	}
+    } elsif ($target eq "edit" ) {
+	my $bodytext = 
+	    &Apache::lonxml::get_all_text_unbalanced("/web",$parser);
+	my $result = &Apache::edit::tag_start($target,$token);
+	$result .= &Apache::edit::editfield($token->[1],$bodytext,'',80,1);
+	return $result;
+    } elsif ( $target eq "modified" ) {
+	return $token->[4].&Apache::edit::modifiedfield("/web",$parser);
+    }
+    return '';
 }
 
 sub end_web {
+    return '';
 }
 
 sub start_tex {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
-  if ($target eq 'tex') {
-    return $bodytext
-  }
-  return '';
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result='';
+    if ($target ne 'edit' && $target ne 'modified') {
+	my $bodytext=&Apache::lonxml::get_all_text("/tex",$parser,$style);
+	if ($target eq 'tex') {
+	    
+	    # If inside a table, occurrences of \\ must be removed;
+	    # else the table blows up.
+
+	    if (&Apache::londefdef::is_inside_of($tagstack, "table")) {
+		$bodytext =~ s/\\\\//g;
+	    }
+	    return $bodytext.'{}';
+	}
+    } elsif ($target eq "edit" ) {
+	my $bodytext = 
+	    &Apache::lonxml::get_all_text_unbalanced("/tex",$parser);
+	my $result = &Apache::edit::tag_start($target,$token);
+	$result .= &Apache::edit::editfield($token->[1],$bodytext,'',80,1);
+	return $result;
+    } elsif ( $target eq "modified" ) {
+	return $token->[4].&Apache::edit::modifiedfield("/tex",$parser);
+    }
+    return $result;;
 }
 
 sub end_tex {
+    return '';
+}
+
+sub homework_js {
+    return &Apache::loncommon::resize_textarea_js().
+           &setmode_javascript().
+	<<'JS';
+<script type="text/javascript">
+// <![CDATA[
+function setSubmittedPart (part,prefix) {
+    if (typeof(prefix) == 'undefined') {
+        this.document.lonhomework.submitted.value="part_"+part;
+    } else {
+        for (var i=0;i<this.document.lonhomework.elements.length;i++) {
+            if (this.document.lonhomework.elements[i].name == prefix+'submitted') {
+                this.document.lonhomework.elements[i].value="part_"+part;
+            }
+        }
+    }
+}
+
+function image_response_click (which, e) {
+    init_geometry();
+    if (!e) { e = window.event; } //IE
+    var input_element = document.lonhomework.elements[which];
+    var token_element = document.lonhomework.elements[which+'_token'];
+    var token = token_element.value;
+    var img_element   = document.getElementById(which+'_imageresponse');
+    var x= e.clientX-getX(img_element)+Geometry.getHorizontalScroll();
+    var y= e.clientY-getY(img_element)+Geometry.getVerticalScroll();
+    var click = x+':'+y;
+    input_element.value = click;
+    img_element.src = '/adm/randomlabel.png?token='+token+'&clickdata='+click;
+}
+// ]]>
+</script>
+JS
+}
+
+sub setmode_javascript {
+    return <<"ENDSCRIPT";
+<script type="text/javascript">
+// <![CDATA[
+function setmode(form,probmode) {
+    form.problemmode.value = probmode;
+    form.submit();
+}
+// ]]>
+</script>
+ENDSCRIPT
+}
+
+sub page_start {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$name,
+	$extra_head)=@_;
+    my %found;
+    foreach my $taginside (@$tagstack) {
+	foreach my $taglookedfor ('html','body','form') {
+	    if ($taginside =~ /^$taglookedfor$/i) {$found{$taglookedfor} = 1;}
+	}
+    }
+
+    if ($target eq 'tex') {
+	return
+	    &Apache::londefdef::start_html($target,$token,$tagstack,
+					   $parstack,$parser,$safeeval);
+    }
+
+    $extra_head .= &homework_js().
+                   &Apache::lonhtmlcommon::dragmath_js("EditMathPopup");
+    if (&Apache::lonhtmlcommon::htmlareabrowser()) {
+        my %textarea_args = (
+                                dragmath => 'math',
+                              );
+        $extra_head .= &Apache::lonhtmlcommon::htmlareaselectactive(\%textarea_args);
+    }
+    my $is_task = ($env{'request.uri'} =~ /\.task$/);
+    my $needs_upload;
+    my ($symb)= &Apache::lonnet::whichuser();
+    my ($map,$resid,$resurl)=&Apache::lonnet::decode_symb($symb);
+    if ($is_task) {
+        $extra_head .= &Apache::lonhtmlcommon::file_submissionchk_js();
+    } else {
+        if (&Apache::lonnet::EXT("resource.$Apache::inputtags::part.uploadedfiletypes") ne '') {
+            unless ($env{'request.state'} eq 'construct') {
+                my $navmap = Apache::lonnavmaps::navmap->new();
+                if (ref($navmap)) {
+                    my $mapres = $navmap->getResourceByUrl($map);
+                    my $is_page;
+                    if (ref($mapres)) {
+                        $is_page = $mapres->is_page();
+                    }
+                    unless ($is_page) {
+                        $needs_upload = 1;
+                    }
+                }
+            }
+        } else {
+            unless ($env{'request.state'} eq 'construct') {
+                my $navmap = Apache::lonnavmaps::navmap->new();
+                if (ref($navmap)) {
+                    my $mapres = $navmap->getResourceByUrl($map);
+                    my $is_page;
+                    if (ref($mapres)) {
+                        $is_page = $mapres->is_page();
+                    }
+                    unless ($is_page) {
+                        my $res = $navmap->getBySymb($symb);
+                        if (ref($res)) {
+                            my $partlist = $res->parts();
+                            if (ref($partlist) eq 'ARRAY') {
+                                foreach my $part (@{$partlist}) {
+                                    my @types = $res->responseType($part);
+                                    my @ids = $res->responseIds($part);
+                                    for (my $i=0; $i < scalar(@ids); $i++) {
+                                        if ($types[$i] eq 'essay') {
+                                            my $partid = $part.'_'.$ids[$i];
+                                            if (&Apache::lonnet::EXT("resource.$partid.uploadedfiletypes") ne '') {
+                                                $needs_upload = 1;
+                                                last;
+                                            }
+                                        }
+                                    }
+                                }
+                            } 
+                        }
+                    }
+                }
+            }
+        }
+        if ($needs_upload) {
+            $extra_head .= &Apache::lonhtmlcommon::file_submissionchk_js();
+        }
+    }
+
+    my %body_args;
+    if (defined($found{'html'})) {
+	$body_args{'skip_phases'}{'head'}=1;
+    } else {
+	
+	$extra_head .= &Apache::lonhtmlcommon::spellheader();
+
+	$extra_head .= &Apache::londefdef::generate_css_links();
+
+	if ($env{'request.state'} eq 'construct') {
+	    $extra_head.=&Apache::edit::js_change_detection().
+		"<script type=\"text/javascript\">\n".
+		"if (typeof swmenu != 'undefined') {swmenu.currentURL=null;}\n".
+		&Apache::loncommon::browser_and_searcher_javascript().
+                "\n</script>\n";
+	}
+    }
+
+    my $pageheader = '';
+    if (defined($found{'body'})) {
+	$body_args{'skip_phases'}{'body'}=1;
+    } elsif (!defined($found{'body'}) 
+	     && $env{'request.state'} eq 'construct') {
+	if ($target eq 'web' || $target eq 'edit') {
+        # Breadcrumbs for Construction Space
+        &Apache::lonhtmlcommon::clear_breadcrumbs();
+        &Apache::lonhtmlcommon::add_breadcrumb({
+            'text'  => 'Construction Space',
+            'href'  => &Apache::loncommon::authorspace($env{'request.uri'}),
+        });
+        # breadcrumbs (and tools) will be created 
+        # in start_page->bodytag->innerregister
+
+# FIXME Where are we?
+#        &Apache::lonhtmlcommon::add_breadcrumb({
+#            'text'  => 'Problem Editing', # 'Problem Testing'
+#            'href'  => '',
+#        });
+        $pageheader =&Apache::loncommon::head_subbox(
+                &Apache::loncommon::CSTR_pageheader());
+	}
+    } elsif (!defined($found{'body'})) {
+	my %add_entries;
+	my $background=&Apache::lonxml::get_param('background',$parstack,
+						  $safeeval);
+	if ($background ne '' ) {
+	    $add_entries{'background'} = $background;
+	}
+
+	my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,
+					       $safeeval);
+        if ($bgcolor eq '' ) { $bgcolor = '#FFFFFF'; }
+
+        $body_args{'bgcolor'}        = $bgcolor;
+        # $body_args{'no_title'}       = 1;
+        $body_args{'force_register'} = 1;
+        $body_args{'add_entries'}    = \%add_entries;
+        if ( $env{'request.state'} eq   'construct') {
+            $body_args{'only_body'}  = 1;
+        }
+    }
+    $body_args{'no_auto_mt_title'} = 1;
+    my $page_start = &Apache::loncommon::start_page($name,$extra_head,
+						    \%body_args);
+    $page_start .= $pageheader;
+    if (!defined($found{'body'}) 
+	&& $env{'request.state'} ne 'construct'
+	&& ($target eq 'web' || $target eq 'webgrade')) {
+
+	my ($symb,undef,undef,undef,$publicuser)= &Apache::lonnet::whichuser();
+        if ($symb eq '' && !$publicuser) {
+            $page_start .= '<p class="LC_info">'
+                          .&mt('Browsing resource, all submissions are temporary.')
+                          .'</p>';
+        }
+    }
+
+    if (!defined($found{'body'}) && $env{'request.state'} ne 'construct') {
+	$page_start .= &Apache::lonxml::message_location();
+    }
+    my $form_tag_start;
+    if (!defined($found{'form'})) {
+	$form_tag_start='<form name="lonhomework" enctype="multipart/form-data" method="post" action="';
+	my $uri = &Apache::loncommon::inhibit_menu_check(
+                &Apache::lonenc::check_encrypt($env{'request.uri'}));
+        $uri = &HTML::Entities::encode($uri,'<>&"');
+	$form_tag_start.=$uri.'" ';
+	if ($target eq 'edit') {
+	    $form_tag_start.=&Apache::edit::form_change_detection();
+	}
+        my ($symb,$courseid,$udom,$uname)=&Apache::lonnet::whichuser();
+        my ($path,$multiresp) = 
+            &Apache::loncommon::get_turnedin_filepath($symb,$uname,$udom);
+        if (($is_task) || ($needs_upload)) {
+            $form_tag_start .= ' onsubmit="return file_submission_check(this,'."'$path','$multiresp'".');"';
+        }
+	$form_tag_start.='>'."\n";
+
+	my $symb=&Apache::lonnet::symbread();
+	if ($symb =~ /\S/) {
+	    $symb=
+		&HTML::Entities::encode(&Apache::lonenc::check_encrypt($symb));
+	    $form_tag_start.=
+		"\t".'<input type="hidden" name="symb" value="'.$symb.'" />'."\n";
+	}
+    }
+    return ($page_start,$form_tag_start);
+}
+
+#use Time::HiRes();
+sub get_resource_name {
+    my ($parstack,$safeeval)=@_;
+    my $name;
+    if (defined($Apache::lonhomework::name)) {
+	$name = $Apache::lonhomework::name;
+    } else {
+	my ($symb)=&Apache::lonnet::whichuser();
+	$name=&Apache::lonnet::gettitle($symb);
+	if ($name eq '') {
+	    $name=&Apache::lonnet::EXT('resource.title');
+	    if ($name eq 'con_lost') { $name = ''; }
+	}
+	if ($name!~/\S+/) {
+	    $name=$env{'request.uri'};
+	    $name=~s-.*/([^/]+)$-$1-;
+	}
+	# The name has had html tags escaped:
+       
+	$name=~s/&lt;/</gs;
+	$name=~s/&gt;/>/gs;
+
+	$Apache::lonhomework::name=$name;
+    }
+    return $name;
+}
+
+sub setup_rndseed {
+    my ($safeeval,$target)=@_;
+    my ($symb)=&Apache::lonnet::whichuser();
+    my ($questiontype,$set_safespace,$rndseed);
+    if ($target eq 'analyze') {
+        $questiontype = $env{'form.grade_questiontype'};
+    }
+    unless (defined($questiontype)) {
+        $questiontype = $Apache::lonhomework::type;
+    }
+    if ($env{'request.state'} eq "construct" 
+	|| $symb eq '' 
+	|| $Apache::lonhomework::type eq 'practice'
+	|| $Apache::lonhomework::history{'resource.CODE'}) {
+	&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+						['rndseed']);
+	$rndseed=$env{'form.rndseed'};
+	if (!$rndseed) {
+	    $rndseed=$Apache::lonhomework::history{'rndseed'};
+	    if (!$rndseed) {
+		$rndseed=time;
+	    }
+	    $env{'form.rndseed'}=$rndseed;
+	}
+        if (($env{'request.state'} eq "construct") && 
+            ($Apache::lonhomework::type eq 'randomizetry')) {
+            my $tries = $Apache::lonhomework::history{"resource.$Apache::inputtags::part.tries"};
+            if ($tries) {
+                $rndseed += $tries;
+            }
+            $env{'form.'.$Apache::inputtags::part.'.rndseed'}=$rndseed;
+        }
+	if ( ($env{'form.resetdata'} eq &mt('New Problem Variation')
+	      && $env{'form.submitted'} eq 'yes')  ||
+	    $env{'form.newrandomization'} eq &mt('New Randomization')) {
+	    srand(time);
+	    $rndseed=int(rand(2100000000));
+	    $env{'form.rndseed'}=$rndseed;
+	    delete($env{'form.resetdata'});
+	    delete($env{'form.newrandomization'});
+	}
+        $rndseed=~s/\,/\:/g;
+        $rndseed=~s/[^\w\d\:\-]//g;
+	if (defined($rndseed)) {
+            my ($c1,$c2)=split(/\:/,$rndseed);
+            unless ($c2) { $c2=0; }
+            unless (($c1==int($c1)) && ($c2==int($c2))) {
+	       $rndseed=join(':',&Apache::lonnet::digest($rndseed));
+            }
+        }
+        if ($Apache::lonhomework::history{'resource.CODE'}) {
+	   $rndseed=&Apache::lonnet::rndseed();
+	}
+        $set_safespace = 1;
+    } elsif ($questiontype eq 'randomizetry') {
+        if ($target eq 'analyze') {
+            if (defined($env{'form.grade_rndseed'})) {
+                $rndseed = $env{'form.grade_rndseed'};
+            }
+        }
+        unless (($target eq 'analyze') && (defined($rndseed))) {
+            $rndseed=&Apache::lonnet::rndseed();
+            my $curr_try = $Apache::lonhomework::history{"resource.$Apache::inputtags::part.tries"};
+            if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
+                $curr_try ++;
+            }
+            if ($rndseed =~/^(\d+)[,:](\d+)$/) {
+                $rndseed = $1;
+            }
+            if ($curr_try) {
+                my $reqtries = &Apache::lonnet::EXT("resource.$Apache::inputtags::part.randomizeontries");
+                if (($reqtries =~ /^\d+$/) && ($reqtries > 1)) {
+                    my $inc = int(($curr_try-1)/$reqtries);
+                    $rndseed += $inc;
+                } else {
+                    $rndseed += $curr_try;
+                }
+            }
+        }
+        $set_safespace = 1;
+    }
+    if ($set_safespace) {
+        if ($safeeval) {
+            &Apache::lonxml::debug("Setting rndseed to $rndseed");
+            &Apache::run::run('$external::randomseed="'.$rndseed.'";',$safeeval);
+        }
+    }
+    unless (($env{'request.state'} eq "construct") || ($symb eq '')) {
+        $env{'form.'.$Apache::inputtags::part.'.rndseed'}=$rndseed;
+    }
+    return $rndseed;
+}
+
+sub remember_problem_state {
+    return '
+       <input type="hidden" name="problemstate" value="'.$env{'form.problemstate'}.'" />
+       <input type="hidden" name="problemtype" value="'.$env{'form.problemtype'}.'" />
+       <input type="hidden" name="problemstatus" value="'.$env{'form.problemstatus'}.'" />';
+}
+
+sub problem_edit_action_button {
+    my ($name,$action,$accesskey,$text,$flag)=@_;
+    my $actionscript="setmode(this.form,'$action')";
+    return "\n<input type='button' name='$name' accesskey='$accesskey' value='".&mt($text)."'".
+           ($flag?&Apache::edit::submit_ask_anyway($actionscript):&Apache::edit::submit_dont_ask($actionscript))." />";
+}
+
+sub problem_edit_buttons {
+   my ($mode)=@_;
+# Buttons that do not save
+   my $result='<div class="LC_edit_problem_discards">'.
+              &problem_edit_action_button('subdiscview','discard','d','Discard Edits and View',1);
+   if ($mode eq 'editxml') {
+       $result.=&problem_edit_action_button('subedit','edit','e','Edit',1);
+       $result.=&problem_edit_action_button('subundo','undoxml','u','Undo',1);
+       $result.=&Apache::lonhtmlcommon::dragmath_button("LC_editxmltext",1);
+   } else {
+       $result.=&problem_edit_action_button('subeditxml','editxml','x','EditXML',1);
+       $result.=&problem_edit_action_button('subundo','undo','u','Undo',1);
+   }
+   $result.="\n</div>";
+# Buttons that save
+   $result.='<div class="LC_edit_problem_saves">';
+   if ($mode eq 'editxml') {
+       $result.=&problem_edit_action_button('subsaveedit','saveeditxml','s','Save and EditXML');
+       $result.=&problem_edit_action_button('subsaveview','saveviewxml','v','Save and View');
+   } else {
+       $result.=&problem_edit_action_button('subsaveedit','saveedit','s','Save and Edit');
+       $result.=&problem_edit_action_button('subsaveview','saveview','v','Save and View');
+   }
+   $result.="\n</div>\n";
+   return $result;
+}
+
+sub problem_edit_header {
+    return '<input type="hidden" name="submitted" value="edit" />'.
+	&remember_problem_state('edit').'
+<div class="LC_edit_problem_header">
+<div class="LC_edit_problem_header_title">
+'.&mt('Problem Editing').&Apache::loncommon::help_open_menu('Problem Editing','Problem_Editor_XML_Index',5,'Authoring').'
+</div>'.
+'<input type="hidden" name="problemmode" value="saveedit" />'.
+&problem_edit_buttons().'
+<hr style="clear:both;" />
+'.&Apache::lonxml::message_location().'
+</div>
+'.
+       '<table border="0" width="100%"><tr><td bgcolor="#F8F8F8">';
+}
+
+sub problem_edit_footer {
+    return '</td></tr></table><br />
+<div class="LC_edit_problem_footer">
+  <hr />'.
+&problem_edit_buttons().'
+  <hr style="clear:both;" />
+</div>
+'.
+    "\n</form>\n".&Apache::loncommon::end_page();
+}
+
+sub option {
+    my ($value,$name) = @_;
+    my $result ="<option value='".$value."' ";
+    if ($env{'form.'.$name} eq $value) {
+	$result.=" selected='on' ";
+    }
+    $result.='>';
+    return $result;
+}
+
+sub problem_web_to_edit_header {
+    my ($rndseed)=@_;
+    my $result .= '<div class="LC_edit_problem_header">';
+
+    if (!$Apache::lonhomework::parsing_a_task) {
+	$result .= 
+	    '<div class="LC_edit_problem_header_title">'.
+	    &mt('Problem Testing').
+	    &Apache::loncommon::help_open_topic('Problem_Editor_Testing_Area').
+	    '</div>';
+    } else {
+	$result .= 
+	    '<div class="LC_edit_problem_header_title">'.
+	    &mt('Task Testing').
+	    '</div>';
+    }
+    
+    my $show_all_foils_text = 
+	($Apache::lonhomework::parsing_a_task) ?
+	&mt('Show All Instances')
+	: &mt('Show All Foils');
+
+    my $show_all= '<span class="LC_nobreak"><label for="showallfoils">'
+                 .'<input type="checkbox" name="showallfoils"';
+    if (defined($env{'form.showallfoils'})) { $show_all.=' checked="checked"'; }
+    $show_all.= ' /> '.$show_all_foils_text
+               .'</label></span>';
+
+
+
+    $result .= '<div class="LC_edit_problem_header_status_row">';
+    if (!$Apache::lonhomework::parsing_a_task) {
+	$result.="
+<div class='LC_edit_problem_header_row1'>
+<span class=\"LC_nobreak\">
+".&mt("Problem Status:")."
+<select name='problemstate'>
+  <option value=''></option>
+  ".&option('CLOSED'               ,'problemstate').&mt("Closed")."</option>
+  ".&option('CAN_ANSWER'           ,'problemstate').&mt("Answerable")."</option>
+  ".&option('CANNOT_ANSWER_tries'  ,'problemstate').&mt("Open with full tries")."</option>
+  ".&option('CANNOT_ANSWER_correct','problemstate').&mt("Open and correct")."</option>
+  ".&option('SHOW_ANSWER'          ,'problemstate').&mt("Show Answer")."</option>
+</select>
+</span>
+<span class=\"LC_nobreak\">
+".&mt("Problem Type:")."
+<select name='problemtype'>
+  <option value=''></option>
+  ".&option('exam'   ,'problemtype').&mt("Exam Problem")."</option>
+  ".&option('problem','problemtype').&mt("Homework Problem")."</option>
+  ".&option('survey' ,'problemtype').&mt("Survey Question")."</option>
+  ".&option('surveycred' ,'problemtype').&mt("Survey Question (with credit)")."</option>
+  ".&option('anonsurvey' ,'problemtype').&mt("Anonymous Survey Question")."</option>
+  ".&option('anonsurveycred' ,'problemtype').&mt("Anonymous Survey Question (with credit)")."</option>
+  ".&option('practice' ,'problemtype').&mt("Practice Problem")."</option>
+  ".&option('randomizetry' ,'problemtype').&mt("New Randomization Each Try")."</option>
+</select>
+</span>
+$show_all
+</div>
+<div class='LC_edit_problem_header_row2'>
+<span class=\"LC_nobreak\">
+".&mt("Feedback Mode:")."
+<select name='problemstatus'>
+  <option value=''></option>
+  ".&option('yes','problemstatus').&mt("Show Feedback")."</option>
+  ".&option('no', 'problemstatus').&mt("Don't Show Incorect/Correct Feedback")."</option>
+  ".&option('no_feedback_ever', 'problemstatus').&mt("Don't Show Any Feedback")."</option>
+</select>
+</span>
+";
+
+    } elsif ($Apache::lonhomework::parsing_a_task) {
+	$result.="
+<div class='LC_edit_problem_header_row1'>
+<span class=\"LC_nobreak\">
+".&mt("Problem Status:")."
+<select name='problemstate'>
+  <option value=''></option>
+  ".&option('CLOSED'               ,'problemstate').&mt("Closed")."</option>
+  ".&option('CAN_ANSWER'           ,'problemstate').&mt("Answerable")."</option>
+  ".&option('WEB_GRADE'            ,'problemstate').&mt("Criteria Grading")."</option>
+  ".&option('SHOW_ANSWER'          ,'problemstate').&mt("Show Feedback")."</option>
+</select>
+</span>
+$show_all
+";
+    }
+    $result.='
+       <span class="LC_nobreak">
+       '.&mt('Apply style file: ').'
+         <input type="text" name="style_file" value="'.&HTML::Entities::encode($env{'construct.style'},'"<>&').'" />
+         <a href="javascript:openbrowser(\'lonhomework\',\'style_file\',\'sty\')">'.&mt('Select').'</a>
+       </span>
+     </div>
+     <div class="LC_edit_problem_header_row1">'.
+       &Apache::lonxml::renderingoptions().'
+     </div>
+     <input type="submit" name="changeproblemmode" value="'.&mt("Change View").'" />
+     <input type="submit" name="clear_style_file" accesskey="d" value="'.&mt('Show Default View').'" />
+     <input type="submit" name="resetdata" accesskey="r" value="'.&mt('Reset Submissions').'" />
+   </div>
+   <hr />
+   <div class="LC_edit_problem_header_randomize_row">
+     <input type="submit" name="newrandomization" accesskey="a" value="'.&mt('New Randomization').'" />
+     <input type="submit" name="changerandseed" value="'.&mt('Change Random Seed To:').'" />
+     <input type="text" name="rndseed" size="24" value="'.
+	       $rndseed.'"
+             onchange="javascript:document.lonhomework.changerandseed.click()" />';
+
+    if (!$Apache::lonhomework::parsing_a_task) {
+	my $numtoanalyze=$env{'form.numtoanalyze'};
+	if (!$numtoanalyze) { $numtoanalyze=20; }
+	$result .= '<span class="LC_nobreak">'.
+	    &mt('[_1] for [_2] versions.',
+		'<input type="button" name="submitmode" value="'.&mt('Calculate answers').'" '.
+                'onclick="javascript:setmode(this.form,'."'calcanswers'".')" />'
+               ,'<input type="text" name="numtoanalyze" value="'.
+		$numtoanalyze.'" size="5" />').
+		&Apache::loncommon::help_open_topic("Analyze_Problem",'',undef,undef,300).
+		'</span>';
+						    
+    }
+
+    $result.='
+   </div>
+   <hr />
+   <div>';
+    $result.='<input type="hidden" name="problemmode" value="view" />';
+    $result .= '<input type="button" name="submitmode" accesskey="e" value="'.&mt('Edit').'" '.
+               'onclick="javascript:setmode(this.form,'."'edit'".')" />';
+    $result .= '<input type="button" name="submitmode" accesskey="x" value="'.&mt('EditXML').'" '.
+               'onclick="javascript:setmode(this.form,'."'editxml'".')" />';
+    $result.='
+   </div>
+   <hr />
+   '.&Apache::lonxml::message_location().'
+</div>';
+    return $result;
+}
+
+sub initialize_storage {
+    my ($given_symb) = @_;
+    undef(%Apache::lonhomework::results);
+    undef(%Apache::lonhomework::history);
+    my ($symb,$courseid,$domain,$name) = 
+	&Apache::lonnet::whichuser($given_symb);
+    
+    # anonymous users (CODEd exams) have no data
+    if ($name eq 'anonymous' 
+	&& !defined($domain)) {
+	return;
+    }
+
+    if ($env{'request.state'} eq 'construct' 
+	|| $symb eq ''
+	|| $Apache::lonhomework::type eq 'practice') {
+	
+	my $namespace = $symb || $env{'request.uri'};
+	if ($env{'form.resetdata'} eq &mt('Reset Submissions') ||
+	    ($env{'form.resetdata'} eq &mt('New Problem Variation')
+	     && $env{'form.submitted'} eq 'yes') ||
+	    $env{'form.newrandomization'} eq &mt('New Randomization')) {
+	    &Apache::lonnet::tmpreset($namespace,'',$domain,$name);
+	    &Apache::lonxml::debug("Attempt reset");
+	}
+	%Apache::lonhomework::history=
+	    &Apache::lonnet::tmprestore($namespace,'',$domain,$name);
+	my ($temp)=keys %Apache::lonhomework::history ;
+	&Apache::lonxml::debug("Return message of $temp");
+    } else {
+	%Apache::lonhomework::history=
+	    &Apache::lonnet::restore($symb,$courseid,$domain,$name);
+    }
+
+    #ignore error conditions
+    my ($temp)=keys %Apache::lonhomework::history ;
+    if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
+}
+
+=pod
+
+=item finalize_storage()
+
+	Stores away the result has to a student's environment
+	checks form.grade_ for specific values, other wises stores
+	to the running users environment
+	Will increment totals for attempts, students, and corrects
+	if running user has student role.
+	
+=cut
+
+
+sub finalize_storage {
+    my ($given_symb) = @_;
+    my $result;
+    if (%Apache::lonhomework::results) {
+	my @remove = grep(/^INTERNAL_/,keys(%Apache::lonhomework::results));
+	delete(@Apache::lonhomework::results{@remove});
+	my ($symb,$courseid,$domain,$name) = 
+	    &Apache::lonnet::whichuser($given_symb);
+	if ($env{'request.state'} eq 'construct' 
+	    || $symb eq ''
+	    || $Apache::lonhomework::type eq 'practice') {
+	    my $namespace = $symb || $env{'request.uri'};
+	    $Apache::lonhomework::results{'rndseed'}=$env{'form.rndseed'};
+	    $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
+					      $namespace,'',$domain,$name);
+	    &Apache::lonxml::debug('Construct Store return message:'.$result);
+	} else {
+	    $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
+					    $symb,$courseid,$domain,$name);
+	    &Apache::lonxml::debug('Store return message:'.$result);
+            &store_aggregates($symb,$courseid);
+	}
+    } else {
+	&Apache::lonxml::debug('Nothing to store');
+    }
+    return $result;
+}
+
+=pod
+
+item store_aggregates()
+
+	Sends hash of values to be incremented in nohist_resourcetracker.db
+	for the course. Increments total number of attempts, unique students 
+	and corrects for each part for an instance of a problem, as appropriate.
+	
+=cut
+
+sub store_aggregates {
+    my ($symb,$courseid) = @_;
+    my (%aggregate,%anoncounter,%randtrycounter);
+    my @parts;
+    my $cdomain = $env{'course.'.$env{'request.course.id'}.'.domain'};
+    my $cname = $env{'course.'.$env{'request.course.id'}.'.num'};
+    foreach my $key (keys(%Apache::lonhomework::results)) {
+        if ($key =~ /resource\.([^\.]+)\.tries/) {
+            push(@parts, $1);
+        }
+    }
+    foreach my $part (@parts) {
+        if ($env{'request.role'} =~/^st/) {
+            if ($Apache::lonhomework::results{'resource.'.$part.'.award'}
+	        eq 'APPROX_ANS' ||
+	        $Apache::lonhomework::results{'resource.'.$part.'.award'}
+	        eq 'EXACT_ANS') {
+                $aggregate{$symb."\0".$part."\0correct"} = 1;
+            }
+            if ($Apache::lonhomework::results{'resource.'.$part.'.tries'} == 1) {
+                $aggregate{$symb."\0".$part."\0users"} = 1;
+            } else {
+                my (undef,$last_reset) = &Apache::grades::get_last_resets($symb,$env{'request.course.id'},[$part]); 
+                if ($last_reset) {
+                    if (&Apache::grades::get_num_tries(\%Apache::lonhomework::history,$last_reset,$part) == 0) {
+                        $aggregate{$symb."\0".$part."\0users"} = 1;
+                    }
+                }
+            }
+            $aggregate{$symb."\0".$part."\0attempts"} = 1;
+        }
+        if (($Apache::lonhomework::results{'resource.'.$part.'.type'} eq 'anonsurvey') || 
+            ($Apache::lonhomework::results{'resource.'.$part.'.type'} eq 'anonsurveycred') ||
+            ($Apache::lonhomework::results{'resource.'.$part.'.type'} eq 'randomizetry')) {
+            if ($Apache::lonhomework::results{'resource.'.$part.'.type'} eq 'randomizetry') {
+                $randtrycounter{$symb."\0".$part} = 1;
+            } else {
+                $anoncounter{$symb."\0".$part} = 1;
+            }
+            my $needsrelease = $Apache::lonnet::needsrelease{'parameter:type:'.$Apache::lonhomework::results{'resource.'.$part.'.type'}};
+            if ($needsrelease) {   
+                my $curr_required = $env{'course.'.$env{'request.course.id'}.'.internal.releaserequired'};
+                if ($curr_required eq '') {
+                    &Apache::lonnet::update_released_required($needsrelease);
+                } else {
+                    my ($currmajor,$currminor) = split(/\./,$curr_required);
+                    my ($needsmajor,$needsminor) = split(/\./,$needsrelease);
+                    if (($currmajor < $needsmajor) || ($currmajor == $needsmajor && $currminor < $needsminor)) {
+                        &Apache::lonnet::update_released_required($needsrelease);
+                    }
+                }
+            }
+        }
+    }
+    if (keys (%aggregate) > 0) {
+	&Apache::lonnet::cinc('nohist_resourcetracker',\%aggregate,
+                            $cdomain,$cname);
+    }
+    if (keys(%anoncounter) > 0) {
+        &Apache::lonnet::cput('nohist_anonsurveys',\%anoncounter,
+                              $cdomain,$cname);
+    }
+    if (keys(%randtrycounter) > 0) {
+        &Apache::lonnet::cput('nohist_randomizetry',\%randtrycounter,
+                              $cdomain,$cname);
+    }
+}
+
+sub checkout_msg {
+    my %lt=&Apache::lonlocal::texthash( 
+		'resource'=>'The resource needs to be checked out',
+		'id_expln'=>'As a resource gets checked out, a unique timestamped ID is given to it, and a permanent record is left in the system.',
+                'warning'=>'Checking out resources is subject to course policies, and may exclude future credit even if done erroneously.',
+                'checkout'=>'Check out Exam for Viewing',
+		'checkout?'=>'Check out Exam?');
+    my $uri = &Apache::lonenc::check_encrypt($env{'request.uri'});
+    return (<<ENDCHECKOUT);
+<h2>$lt{'resource'}</h2>
+    <p>$lt{'id_expln'}</p>
+<p class="LC_warning">$lt{'warning'}</p>
+<form name="checkout" method="post" action="$uri">
+<input type="hidden" name="doescheckout" value="yes" />
+<input type="button" name="checkoutbutton" value="$lt{'checkout'}" onClick="javascript:if (confirm('$lt{'checkout?'}')) { document.checkout.submit(); }" />
+</form>
+ENDCHECKOUT
+}
+
+sub firstaccess_msg {
+    my ($time,$symb)=@_;
+    my $result;
+    my @interval=&Apache::lonnet::EXT("resource.0.interval");
+    if ($interval[1] eq 'map') {
+	my ($map)=&Apache::lonnet::decode_symb($symb);
+	my $foldertitle=&Apache::lonnet::gettitle($map);
+    
+	&Apache::lonxml::debug("map is $map title is $foldertitle");
+	$result .= "<h2>".&mt('The resources in "[_1]" are open for a limited time.'
+                             .' Once you click the "Show Resource" button below you have [_2] to complete all resources "[_1]".'
+                             ,$foldertitle,$time)."</h2>";
+    } elsif ($interval[1] eq 'course') {
+	my $course = $env{'course.'.$env{'request.course.id'}.'.description'};
+        $result .= "<h2>".&mt('The resources in "[_1]" are open for a limited time.'
+                             .' Once you click the "Show Resource" button below you have [_2] to complete all resources "[_1]".'
+                             ,$course,$time)."</h2>";
+    } else {
+	my $title=&Apache::lonnet::gettitle($symb);
+        $result .= "<h2>".&mt('This resource "[_1]" is open for a limited time.'
+                             .' Once you click the "Show Resource" button below you have [_2] to complete this resource "[_1]".'
+                             ,$title,$time)."</h2>";
+    }
+    my $uri = &Apache::lonenc::check_encrypt($env{'request.uri'});
+    my $buttontext = &mt('Show Resource');
+    my $timertext = &mt('Start Timer?');
+    $result .= (<<ENDCHECKOUT);
+<form name="markaccess" method="post" action="$uri">
+<input type="hidden" name="markaccess" value="yes" />
+<input type="button" name="accessbutton" value="$buttontext" onClick="javascript:if (confirm('$timertext')) { document.markaccess.submit(); }" />
+</form>
+ENDCHECKOUT
+    return $result;
+}
+
+sub init_problem_globals {
+    my ($type)=@_;
+    #initialize globals
+    #   For problems, we start out in part 0 (outside a <part> tag).
+    #   and part 0 is used to describe the main body of the <problem>
+    #
+    if ($type eq 'problem') {
+	$Apache::inputtags::part='0';
+	@Apache::inputtags::partlist=('0');
+	&Apache::lonhomework::set_show_problem_status(&get_problem_status('0'));
+	$Apache::lonhomework::ignore_response_errors=0;
+
+    } elsif ($type eq 'library') {
+	$Apache::inputtags::part='';
+	@Apache::inputtags::partlist=();
+	&Apache::lonhomework::reset_show_problem_status();
+	$Apache::lonhomework::ignore_response_errors=1;
+
+    } elsif ($type eq 'Task') {
+	$Apache::inputtags::part='0';
+	@Apache::inputtags::partlist=('0');
+	&Apache::lonhomework::reset_show_problem_status();
+	$Apache::lonhomework::ignore_response_errors=1;
+    }
+    @Apache::functionplotresponse::callscripts=();
+    @Apache::inputtags::responselist = ();
+    @Apache::inputtags::importlist = ();
+    @Apache::inputtags::previous=();
+    @Apache::inputtags::previous_version=();
+    $Apache::structuretags::printanswer='No';
+    @Apache::structuretags::whileconds=();
+    @Apache::structuretags::whilebody=();
+    @Apache::structuretags::whileline=();
+    $Apache::lonhomework::scantronmode=0;
+    undef($Apache::lonhomework::name);
+    undef($Apache::lonhomework::default_type);
+    undef($Apache::lonhomework::type);
+}
+
+sub reset_problem_globals {
+    my ($type)=@_;
+    undef(%Apache::lonhomework::history);
+    undef(%Apache::lonhomework::results);
+    undef($Apache::inputtags::part);
+    if ($type eq 'Task') {
+        undef($Apache::inputtags::slot_name);
+    }
+#don't undef this, lonhomework.pm takes care of this, we use this to 
+#detect if we try to do 2 problems in one file
+#   undef($Apache::lonhomework::parsing_a_problem);
+    undef($Apache::lonhomework::name);
+    undef($Apache::lonhomework::default_type);
+    undef($Apache::lonhomework::type);
+    undef($Apache::lonhomework::scantronmode);
+    undef($Apache::lonhomework::ignore_response_errors);
+    undef(@Apache::functionplotresponse::callscripts);
+    &Apache::lonhomework::reset_show_problem_status();
+}
+
+sub set_problem_state {
+    my ($part)=@_;
+    if ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct') {
+	$Apache::lonhomework::history{"resource.$part.solved"}=
+	    'correct_by_student';
+    }
+}
+
+sub get_problem_status {
+    my ($part)=@_;
+    my $problem_status;
+    if ($env{'request.state'} eq 'construct' &&
+	defined($env{'form.problemstatus'})) {
+	$problem_status=$env{'form.problemstatus'};
+    } else {
+	$problem_status=&Apache::lonnet::EXT("resource.$part.problemstatus");
+	&Apache::lonxml::debug("problem status for $part is $problem_status");
+	&Apache::lonxml::debug("env probstat is ".$env{'form.problemstatus'});
+    }
+    return $problem_status;
 }
 
 sub start_problem {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+
+    # We'll use the redirection to fix up printing of duedates.
+    if (!$Apache::lonxml::metamode) {
+	&Apache::lonxml::startredirection();
+    }
+
+    # Problems don't nest and we don't allow more than one <problem> in
+    # a .problem file.
+    #
+    if ( $Apache::inputtags::part ne '' ||
+	 $Apache::lonhomework::parsing_a_problem) {
+	&Apache::lonxml::error('Only one &lt;problem&gt; allowed in a .problem file');
+	#my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser,$style);
+	return '';
+    }
+
+    $Apache::lonhomework::parsing_a_problem=1;
+    &init_problem_globals('problem');
+
+    if (defined($env{'scantron.maxquest'})) {
+	$Apache::lonhomework::scantronmode=1;
+    }
+
+    if ($target ne 'analyze') {
+        my $type = &Apache::lonnet::EXT('resource.0.type');
+	$Apache::lonhomework::type=$type;
+	if (($env{'request.state'} eq 'construct') &&
+	    $env{'form.problemtype'} =~ /\S/) {
+	    $Apache::lonhomework::type=$env{'form.problemtype'};
+	}
+	&Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
+    }
+    if ($Apache::lonhomework::type eq '' ) {
+	my $uri=$env{'request.uri'};
+	if ($uri=~/\.(\w+)$/) {
+	    $Apache::lonhomework::type=$1;
+	    &Apache::lonxml::debug("Using type of $1");
+	} else {
+	    $Apache::lonhomework::type='problem';
+	    &Apache::lonxml::debug("Using default type, problem, :$uri:");
+	}
+    }
+    $Apache::lonhomework::default_type = $Apache::lonhomework::type;
+
+    &initialize_storage();
+    if ($target ne 'analyze'
+       	&& $env{'request.state'} eq 'construct') {
+	&set_problem_state('0');
+    }
 
-#intialize globals
-  $Apache::inputtags::part='0';
-  @Apache::inputtags::responselist = ();
-
-#adeed vars to the scripting enviroment
-  my $expression='$external::part='.$Apache::inputtags::part.';';
-  &Apache::run::run($expression,$safeeval);
-  my $status;
-  my $datemsg;
-  if ($target ne 'meta') {
-    ($status,$datemsg) = &Apache::lonhomework::check_date('0');
-    push (@Apache::inputtags::status,$status);
-    my $expression='$external::datestatus="'.$status.'";';
-    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
+    if ($target eq 'web') {
+	&Apache::lonxml::debug(" grading history ");
+	&Apache::lonhomework::showhash(%Apache::lonhomework::history);
+    }
+
+    #added vars to the scripting enviroment
+    my $expression='$external::part=\''.$Apache::inputtags::part.'\';';
+    $expression.='$external::type=\''.$Apache::lonhomework::type.'\';';
     &Apache::run::run($expression,$safeeval);
-    if ( $status eq 'CLOSED' ) {
-      my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
-      if ( $target eq "web" ) {
-	return "<br></br>Problem is not open to be viewed. The problem $datemsg<br></br>";
-      }
-    } 
-  }
-  if ($target eq 'web') {
-    my $args ='';
-    if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-    my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
-    if ($status eq 'CAN_ANSWER') {
-      # create a page header and exit
-      return "<title>$name</title>\n<body bgcolor=#FFFFFF>\n<form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">";
-    } elsif ($status eq 'SHOW_ANSWER') {
-      return "<title>$name</title>\n<body bgcolor=#FFFFFF>\n";
+    my $status;
+    my $accessmsg;
+
+    my $name= &get_resource_name($parstack,$safeeval);
+    my ($result,$form_tag_start);
+    if ($target eq 'web' || $target eq 'webgrade' || $target eq 'tex'
+	|| $target eq 'edit') {
+	($result,$form_tag_start) =
+	    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval,
+			$name);
+    }
+
+    if ($target eq 'tex' and $env{'request.symb'} =~ m/\.page_/) {$result='';}
+
+    if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval,$target); }
+    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
+	$target eq 'tex') {
+	if ($env{'form.markaccess'}) {
+	    my @interval=&Apache::lonnet::EXT("resource.0.interval");
+	    &Apache::lonnet::set_first_access($interval[1]);
+	}
+
+        ($status,$accessmsg,my $slot_name,my $slot) =
+            &Apache::lonhomework::check_slot_access('0','problem');
+        push (@Apache::inputtags::status,$status);
+
+	#handle rand seed in construction space
+	my $rndseed=&setup_rndseed($safeeval,$target);
+	my ($symb)=&Apache::lonnet::whichuser();
+
+	if ($env{'request.state'} ne "construct" && 
+	    ($symb eq '' || $Apache::lonhomework::type eq 'practice')) {
+	    $form_tag_start.='<input type="hidden" name="rndseed" value="'.
+		$rndseed.'" />'.
+		    '<input type="submit" name="resetdata"
+                             value="'.&mt('New Problem Variation').'" />';
+	    if (exists($env{'form.username'})) {
+		$form_tag_start.=
+		    '<input type="hidden" name="username"
+                             value="'.$env{'form.username'}.'" />';
+	    }
+	    if ($env{'request.role.adv'}) {
+		$form_tag_start.= ' <label class="LC_nobreak">'
+                         .'<input type="checkbox" name="showallfoils"';
+		if (defined($env{'form.showallfoils'})) {
+		    $form_tag_start.=' checked="checked"';
+		}
+                $form_tag_start.= ' /> '
+                                 .&mt('Show All Foils')
+                                 .'</label>';
+	    }
+            if ($Apache::lonhomework::type eq 'practice') {
+                $form_tag_start.=&practice_problem_header();
+            }
+	    $form_tag_start.='<hr />';
+        } elsif (($env{'request.state'} ne "construct") &&
+                 ($Apache::lonhomework::type eq 'randomizetry') &&
+                 ($status eq 'CAN_ANSWER')) {
+            my $reqtries = &Apache::lonnet::EXT("resource.$Apache::inputtags::part.randomizeontries");
+            my $problemstatus = &get_problem_status($Apache::inputtags::part);
+            $form_tag_start.=&randomizetry_problem_header($problemstatus,$reqtries);
+        }
+
+	my $expression='$external::datestatus="'.$status.'";';
+	$expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
+	&Apache::run::run($expression,$safeeval);
+	&Apache::lonxml::debug("Got $status");
+
+	if (( $status eq 'CLOSED' ) ||
+	    ( $status eq 'UNCHECKEDOUT') ||
+	    ( $status eq 'NOT_YET_VIEWED') ||
+	    ( $status eq 'BANNED') ||
+	    ( $status eq 'UNAVAILABLE') ||
+	    ( $status eq 'NOT_IN_A_SLOT') ||
+	    ( $status eq 'INVALID_ACCESS')) {
+	    my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser,
+						       $style);
+	    if ( $target eq "web" ) {
+		my $msg;
+		if ($status eq 'UNAVAILABLE') {
+		    $msg.='<h1>'.&mt('Unable to determine if this resource is open due to network problems. Please try again later.').'</h1>';
+                } elsif ($status eq 'NOT_IN_A_SLOT') {
+                    $msg.='<h1>'.&mt('You are not currently signed up to work at this time and/or place.').'</h1>';
+		} elsif ($status ne 'NOT_YET_VIEWED') {
+		    $msg.='<h1>'.&mt('Not open to be viewed').'</h1>';
+		}
+		if ($status eq 'CLOSED' || $status eq 'INVALID_ACCESS') {
+		    $msg.=&mt('The problem ').$accessmsg;
+		} elsif ($status eq 'UNCHECKEDOUT') {
+		    $msg.=&checkout_msg();
+		} elsif ($status eq 'NOT_YET_VIEWED') {
+		    $msg.=&firstaccess_msg($accessmsg,$symb);
+		} elsif ($status eq 'NOT_IN_A_SLOT') {
+		    $msg.=&Apache::bridgetask::add_request_another_attempt_button("Sign up for time to work");
+		}
+		$result.=$msg.'<br />';
+	    } elsif ($target eq 'tex') {
+		my $startminipage = ($env{'form.problem_split'}=~/yes/i)? ''
+		                    : '\begin{minipage}{\textwidth}';
+		$result.='\noindent \vskip 1 mm '.
+		    $startminipage.'\vskip 0 mm';
+		if ($status eq 'UNAVAILABLE') {
+		    $result.=&mt('Unable to determine if this resource is open due to network problems. Please try again later.').'\vskip 0 mm ';
+		} else {
+		    $result.=&mt('Problem is not open to be viewed. It')." $accessmsg \\vskip 0 mm ";
+		}
+	    }
+	} elsif ($status eq 'NEEDS_CHECKIN') {
+	    my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser,
+						       $style);
+	    if ($target eq 'web') {
+		$result .= 
+		    &Apache::bridgetask::proctor_validation_screen($slot);
+	    } elsif ($target eq 'grade') {
+		&Apache::bridgetask::proctor_check_auth($slot_name,$slot,
+							'problem');
+	    }
+	} elsif ($target eq 'web') {
+	    if ($status eq 'CAN_ANSWER' 
+		&& $slot_name ne ''
+		&& $Apache::lonhomework::history{'resource.0.checkedin'} eq '') {
+		# unproctored slot access, self checkin
+		&Apache::bridgetask::check_in('problem',undef,undef,
+					      $slot_name);
+	    }
+	    $result.="\n $form_tag_start \t".	
+	      '<input type="hidden" name="submitted" value="yes" />';
+	    # create a page header and exit
+	    if ($env{'request.state'} eq "construct") {
+		$result.= &problem_web_to_edit_header($env{'form.rndseed'});
+                if ($Apache::lonhomework::type eq 'practice') {
+                    $result.= '<input type="submit" name="resetdata" '.
+                              'value="'.&mt('New Problem Variation').'" />'.
+                              &practice_problem_header().'<hr />';
+                }
+	    }
+	    # if we are viewing someone else preserve that info
+	    if (defined $env{'form.grade_symb'}) {
+		foreach my $field ('symb','courseid','domain','username') {
+		    $result .= '<input type="hidden" name="grade_'.$field.
+			'" value="'.$env{"form.grade_$field"}.'" />'."\n";
+		}
+                foreach my $field ('trial','questiontype') {
+                    if ($env{"form.grade_$field"} ne '') {
+                        $result .= '<input type="hidden" name="grade_'.$field.
+                            '" value="'.$env{"form.grade_$field"}.'" />'."\n";
+                    }
+                }
+	    }
+            if ($env{'form.grade_imsexport'}) {
+                $result = '';
+            }
+	} elsif ($target eq 'tex') {
+	    $result .= 'INSERTTEXFRONTMATTERHERE';
+
+	}
+    } elsif ($target eq 'edit') {
+	$result .= $form_tag_start.&problem_edit_header();
+	$Apache::lonxml::warnings_error_header=
+	    &mt("Editor Errors - these errors might not effect the running of the problem, but they will likely cause problems with further use of the Edit mode. Please use the EditXML mode to fix these errors.")."<br />";
+	my $temp=&Apache::edit::insertlist($target,$token);
+	$result.=$temp;
+    } elsif ($target eq 'modified') {
+	$result=$token->[4];
+    } else {
+	# page_start returned a starting result, delete it if we don't need it
+	$result = '';
     }
-  }
-  return '';
+    return $result;
 }
 
 sub end_problem {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $result='';
-  my $status=$Apache::inputtags::status['-1'];
-  unless ($target eq 'meta') {
-    if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
-      # if part is zero, no <part>s existed, so we need to the grading
-      &Apache::inputtags::grade;
-    } elsif ($Apache::inputtags::part eq '0') {
-      # if part is zero, no <part>s existed, so we need show the current 
-      # grading status
-      $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
-    } 
-    if ($target eq 'web') { 
-      if ($status eq 'CAN_ANSWER') {
-	$result.="</form></body>\n"; 
-      } elsif ($status eq 'SHOW_ANSWER') {
-	$result.="</body>\n"; 
-      } 
-    }
-  } else {
-    if ($Apache::inputtags::part eq '0') {
-      $result=&Apache::response::mandatory_part_meta;
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+
+    if (!$Apache::lonxml::metamode) {
+	$result = &Apache::lonxml::endredirection(); #started in &start_problem
+	$Apache::lonxml::post_evaluate=0;
+    }
+
+    if ($target eq 'tex') {
+	# Figure out the front matter and replace the
+	# INSERTTEXFRONTMATTERHERE in result with it.  note that we do
+	# this in end_problem because whether or not we display due
+	# dates depends on whether due dates have already been
+	# displayed in the problem parts.
+
+	my $frontmatter   = '';
+	my $startminipage = '';
+	if (not $env{'form.problem_split'}=~/yes/) {
+	    $startminipage = '\begin{minipage}{\textwidth}';
+	}
+	my $id = $Apache::inputtags::part;
+	my $weight = &Apache::lonnet::EXT("resource.$id.weight");
+	my $packages=&Apache::lonnet::metadata($env{'request.uri'},'packages');
+	my @packages = split /,/,$packages;
+	my $allow_print_points = 0;
+	foreach my $partial_key (@packages) {
+	    if ($partial_key=~m/^part_0$/) {
+		$allow_print_points=1;
+	    }
+	}
+	my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
+	if (defined($maxtries) && $maxtries < 0) { $allow_print_points=0; }
+	if (lc($env{'course.'.$env{'request.course.id'}.
+			'.disableexampointprint'}) eq 'yes') {
+	    $allow_print_points=0;
+	}
+	my $name_of_resourse= &Apache::lonxml::latex_special_symbols(&get_resource_name($parstack,$safeeval),'header');
+	my $begin_doc=' \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$env{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent ';
+	my $toc_line='\vskip 1 mm\noindent '.$startminipage.
+	    '\addcontentsline{toc}{subsection}{'.$name_of_resourse.'}';
+	
+	#  Figure out what the due date is and if we need to print
+	#  it in the problem header.  We have been logging the
+	#  last due date written to file. 
+	
+	my $duetime = &Apache::lonnet::EXT("resource.$id.duedate"); 
+	my $duedate = POSIX::strftime("%c",localtime($duetime));
+        my $duedate_text = &mt('Due date: [_1]'
+                              ,&Apache::lonlocal::locallocaltime($duetime));
+	my $temp_file;
+	my $filename = "/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.due";
+	
+	# Figure out what the last printed due date is or set it
+	# to the epoch if no duedates have been printed.
+	
+	my $due_file_content = 0;      #   If the file does not yet exist, time is the epoch.
+	if (-e $filename) {
+	    $temp_file = Apache::File->new($filename);
+	    my @due_file      = <$temp_file>;
+	    $due_file_content = $due_file[$#due_file];
+	    chomp $due_file_content;
+	} 
+	
+	# We display the due date iff it is not the same as the last
+	# duedate in problem header ($due_file_content), and
+	# none of our parts displayed a duedate.
+	#
+	my $parts_with_displayduedate;
+	if (defined $Apache::outputtags::showonce{'displayduedate'}) {
+	    $parts_with_displayduedate = 
+		scalar(@{$Apache::outputtags::showonce{'displayduedate'}});
+	} else {
+	    $parts_with_displayduedate = 0;
+	}
+	if (($due_file_content != $duetime) && ($parts_with_displayduedate == 0) ) {
+	    $temp_file = Apache::File->new('>'.$filename);
+	    print $temp_file "$duetime\n";
+	    if (not $env{'request.symb'} =~ m/\.page_/) {
+		if(not $duedate=~m/1969/ and $Apache::lonhomework::type ne 'exam') {
+		    $frontmatter .= $begin_doc.
+			'\textit{'.$duedate_text.'} '.$toc_line;
+		} else {
+		    $frontmatter.= $begin_doc.$toc_line;
+		    if ($Apache::lonhomework::type eq 'exam' and $allow_print_points==1) { 
+			$frontmatter .= '\fbox{\textit{'.&mt('[quant,_1,pt,pt]',$weight ).'}}';
+		    }
+		}
+	    } else {
+		$frontmatter .= '\vskip 1mm\textit{'.$duedate_text.'} \\\\\\\\'.$startminipage;
+	    }
+	} else {
+	    if (not $env{'request.symb'} =~ m/\.page_/) {
+		$frontmatter .= $begin_doc.$toc_line;
+		if (($Apache::lonhomework::type eq 'exam') and ($allow_print_points==1)) { 
+		    $frontmatter .= '\fbox{\textit{'.&mt('[quant,_1,pt,pt]',$weight ).'}}';
+		}
+	    } else {
+		$frontmatter .= '\vskip 1mm \\\\\\\\'.$startminipage;
+	    }
+	}
+	$result =~ s/INSERTTEXFRONTMATTERHERE/$frontmatter/;
+    }
+
+    my $status=$Apache::inputtags::status['-1'];
+    if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
+	$target eq 'tex') {
+	if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
+	    # if part is zero, no <part>s existed, so we need to the grading
+	    if ($status eq 'CAN_ANSWER' ||$Apache::lonhomework::scantronmode) {
+		&Apache::inputtags::grade;
+	    } elsif ($status eq 'NEEDS_CHECKIN') {
+		# no need to grade, and don't want to hide data
+	    } else {
+		# move any submission data to .hidden
+		&Apache::inputtags::hidealldata($Apache::inputtags::part);
+	    }
+	} elsif ( ($target eq 'web' || $target eq 'tex') &&
+		  $Apache::inputtags::part eq '0' &&
+		  $status ne 'UNCHECKEDOUT' && $status ne 'NOT_YET_VIEWED'
+                  && !$env{'form.grade_imsexport'}) {
+	    # if part is zero, no <part>s existed, so we need show the current
+	    # grading status
+	    my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
+	    $result.= $gradestatus;
+	}
+	if (
+	    (($target eq 'web') && ($env{'request.state'} ne 'construct')) ||
+	    ($target eq 'answer') || ($target eq 'tex')
+	   ) {
+	    if (($target ne 'tex') &&
+		($env{'form.answer_output_mode'} ne 'tex') && 
+                (!$env{'form.grade_imsexport'})) {
+		$result.="</form>";
+	    }
+	    if ($target eq 'web') {
+		$result.= &Apache::loncommon::end_page({'discussion' => 1});
+	    } elsif ($target eq 'tex') {
+		my $endminipage = '';
+		if (not $env{'form.problem_split'}=~/yes/) {
+		    $endminipage = '\end{minipage}';
+		}
+                if ($env{'form.print_discussions'} eq 'yes') {
+		    $result.=&Apache::lonxml::xmlend($target,$parser);
+		} else {
+		    $result .= '\keephidden{ENDOFPROBLEM}\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
+		    if (not $env{'request.symb'} =~ m/\.page_/) {
+			$result .= $endminipage.'\end{document} ';
+		    } else {
+			$result .= $endminipage;
+		    }
+		}
+	    }
+	}
+        if ($target eq 'web') {
+           $result.=&Apache::functionplotresponse::init_script();
+        }
+	if ($target eq 'grade') {
+	    &Apache::lonhomework::showhash(%Apache::lonhomework::results);
+	    &finalize_storage();
+	}
+	if ($target eq 'answer' && ($env{'request.state'} eq 'construct')
+	    && $env{'form.answer_output_mode'} ne 'tex') {
+	    $result.=&Apache::loncommon::end_page({'discussion' => 1});
+	                        # normally we get it from above, but in CSTR
+	                        # we always show answer mode too.
+	}
+    } elsif ($target eq 'meta') {
+	if ($Apache::inputtags::part eq '0') {
+	    @Apache::inputtags::response=();
+	    $result=&Apache::response::mandatory_part_meta;
+	}
+	$result.=&Apache::response::meta_part_order();
+	$result.=&Apache::response::meta_response_order();
+    } elsif ($target eq 'edit') {
+	&Apache::lonxml::debug("in end_problem with $target, edit");
+	$result .= &problem_edit_footer();
+    } elsif ($target eq 'modified') {
+	 $result .= $token->[2];
+    }
+
+    if ($env{'request.state'} eq 'construct' && $target eq 'web') {
+	&Apache::inputtags::check_for_duplicate_ids();
+    }
+
+    &reset_problem_globals('problem');
+
+    return $result;
+}
+
+
+sub start_library {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my ($result,$form_tag_start);
+    if ($#$tagstack eq 0 && $$tagstack[0] eq 'library') {
+	&init_problem_globals('library');
+	$Apache::lonhomework::type='problem';
+    }
+    if ($target eq 'edit') {
+	($result,$form_tag_start)=
+	    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval,
+			'Edit');
+	$result.=$form_tag_start.&problem_edit_header();
+	my $temp=&Apache::edit::insertlist($target,$token);
+	$result.=$temp;
+    } elsif ($target eq 'modified') {
+	$result=$token->[4];
+    } elsif (($target eq 'web' || $target eq 'webgrade')
+	     && ($#$tagstack eq 0 && $$tagstack[0] eq 'library')
+	     && $env{'request.state'} eq "construct" ) {
+	my $name=&get_resource_name($parstack,$safeeval);
+	($result,$form_tag_start)=
+	    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval,
+			$name);
+	my $rndseed=&setup_rndseed($safeeval,$target);
+	$result.=" \n $form_tag_start".	
+		  '<input type="hidden" name="submitted" value="yes" />';
+	$result.=&problem_web_to_edit_header($rndseed);
+        if ($Apache::lonhomework::type eq 'practice') {
+            $result.= '<input type="submit" name="resetdata" '.
+                      'value="'.&mt('New Problem Variation').'" />'.
+                      &practice_problem_header().'<hr />';
+        }
     }
-  }
-  return $result;
+    return $result;
+}
+
+sub end_library {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result='';
+    if ($target eq 'edit') {
+	$result=&problem_edit_footer();
+    } elsif ($target eq 'web' 
+	     && ($#$tagstack eq 0 && $$tagstack[0] eq 'library') 
+	     && $env{'request.state'} eq "construct") {
+	$result.='</form>'.&Apache::loncommon::end_page({'discussion' => 1});
+    }
+    if ( $#$tagstack eq 0 && $$tagstack[0] eq 'library') {
+	&reset_problem_globals('library');
+    }
+    return $result;
+}
+
+sub start_definetag {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+
+    my $result;
+
+    my $name = $token->[2]->{'name'};
+    my $skip=&Apache::lonxml::get_all_text("/definetag",$parser,$style);
+    if ($target eq 'web') {
+	if ($name=~/^\//) {
+	    $result=
+		'<br /><table class="LC_sty_end"><tr><th>'.
+		&mt('END [_1]'.'<tt>'.$name.'</tt>').'</th></tr>';
+	} else {
+	    $result=
+		'<br /><table class="LC_sty_begin"><tr><th>'.
+		&mt('BEGIN [_1]'.'<tt>'.$name.'</tt>').'</th></tr>';
+	}
+	$skip = &HTML::Entities::encode($skip, '<>&"');
+	$result.='<tr><td><pre>'.$skip.'</pre></td></tr></table>';
+    }
+    return $result;
+}
+
+sub end_definetag {
+    return '';
 }
 
 sub start_block {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+
+    my $result;
 
-  my $code = @$parstack[$#$parstack];
-  $code =~ s/\"//g;
-  $code .=';return $condition;';
-#  print "<br>$code<br>";
-  my $result = &Apache::run::run($code,$safeeval);
-  &Apache::lonxml::debug("block :$code: returned :$result:");
-  if ( ! $result ) { 
-    my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
-    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
-  }
-  return "";
+    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer'  ||
+	$target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+	my $code = $token->[2]->{'condition'};
+	if (defined($code) && $code ne '') {
+	    if (!$Apache::lonxml::default_homework_loaded) {
+		&Apache::lonxml::default_homework_load($safeeval);
+	    }
+	    $result = &Apache::run::run($code,$safeeval);
+	    &Apache::lonxml::debug("block :$code: returned :$result:");
+	} else {
+	    $result='1';
+	}
+	if ( ! $result ) {
+	    my $skip=&Apache::lonxml::get_all_text("/block",$parser,$style);
+	    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
+	}
+	$result='';
+    } elsif ($target eq 'edit') {
+	$result .=&Apache::edit::tag_start($target,$token);
+	$result .=&Apache::edit::text_arg('Test Condition:','condition',
+					  $token,40);
+	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'condition');
+	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+    }
+    return $result;
 }
 
 sub end_block {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+    if ($target eq "edit") {
+	$result.= &Apache::edit::tag_end($target,$token,'');
+    }
+    return $result;
+}
+
+sub start_languageblock {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+
+    my $result;
+
+    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
+	$target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+	my $include = $token->[2]->{'include'};
+	my $exclude = $token->[2]->{'exclude'};
+        my @preferred_languages=&Apache::lonlocal::preferred_languages();
+# This should not even happen, since we should at least have the server language
+        if (!$preferred_languages[0]) { $preferred_languages[0]='en'; }
+# Now loop over all languages in order of preference
+        foreach my $preferred_language (@preferred_languages) {
+# If the languageblock has no arguments, show the contents
+           $result=1;
+           my $found=0;
+# Do we have an include argument?
+	   if ($include) {
+# If include is specified, by default, don't render the block
+              $result=0;
+              foreach my $included_language (split(/\,/,$include)) {
+# ... but if my preferred language is included, render it
+                 if ($included_language eq $preferred_language) {
+                    $result=1; 
+                    $found=1; 
+                 }
+              }
+	   }
+# Do we have an exclude argument?
+           if ($exclude) {
+              $result=1;
+              foreach my $excluded_language (split(/\,/,$exclude)) {
+                 if ($excluded_language eq $preferred_language) {
+                    $result=0;
+                    $found=1;
+                 }
+              }
+	   }
+           if ($found) { last; }
+        }
+	if ( ! $result ) {
+	    my $skip=&Apache::lonxml::get_all_text("/languageblock",$parser,
+						   $style);
+	    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
+	}
+	$result='';
+    } elsif ($target eq 'edit') {
+	$result .=&Apache::edit::tag_start($target,$token);
+	$result .=&Apache::edit::text_arg(&mt('Include Language:'),'include',
+					  $token,40);
+	$result .=&Apache::edit::text_arg(&mt('Exclude Language:'),'exclude',
+					  $token,40);
+	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'include',
+						     'exclude');
+	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+    }
+    return $result;
+}
+
+sub end_languageblock {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+    if ($target eq "edit") {
+	$result.= &Apache::edit::tag_end($target,$token,'');
+    }
+    return $result;
+}
+
+{
+    my %available_texts;
+    sub start_translated {
+	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+	&Apache::lonxml::register('Apache::structuretags',('lang'));
+	undef(%available_texts);
+    }
+    
+    sub end_translated {
+	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+	my $result;
+	#show the translation on viewable targets
+	if ($target eq 'web'     || $target eq 'tex' || $target eq 'webgrade'||
+	    # or non-viewable targets, if it's embedded in something that
+	    # wants the output
+	    (($target eq 'answer' || $target eq 'analyze'|| $target eq 'grade')
+	     && &Apache::lonxml::in_redirection() ) ) {
+	    my @possibilities = keys(%available_texts);
+	    my $which = 
+		&Apache::loncommon::languages(\@possibilities) || 'default';
+	    $result = $available_texts{$which};
+	}
+	undef(%available_texts);
+	&Apache::lonxml::deregister('Apache::structuretags',('lang'));
+	return $result;
+    }
+
+
+    sub start_lang {
+	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+	if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
+	    $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+	    &Apache::lonxml::startredirection();
+	}
+	return '';
+    }
+
+    sub end_lang {
+	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+	if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
+	    $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+	    my $result = &Apache::lonxml::endredirection();
+	    my $which = &Apache::lonxml::get_param('which',$parstack,
+						   $safeeval);
+            if ($which=~/\w/) {
+                $available_texts{$which} = $result;
+            }
+            my $otherlangs = &Apache::lonxml::get_param('other',$parstack,
+                                                        $safeeval);
+            foreach my $language (split(/\s*\,\s*/,$otherlangs)) {
+                if ($language=~/\w/) {
+                    $available_texts{$language} = $result;
+                }
+            }
+
+	}
+	return '';
+    }
+}
+
+sub start_instructorcomment {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+
+    my $result;
+
+    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
+	$target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+        $result=($env{'request.role'}=~/^(in|cc|co|au|ca|li)/);
+	if ( (! $result) or ($env{'form.instructor_comments'} eq 'hide')) {
+	    my $skip=&Apache::lonxml::get_all_text("/instructorcomment",
+						   $parser,$style);
+	    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
+	}
+	$result='';
+    } elsif ($target eq 'edit') {
+	$result .=&Apache::edit::tag_start($target,$token);
+	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    }
+    return $result;
+}
+
+sub end_instructorcomment {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+    if ($target eq "edit") {
+	$result.= &Apache::edit::tag_end($target,$token,'');
+    }
+    return $result;
 }
 
 sub start_while {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
 
-  my $code = @$parstack[$#$parstack];
-  $code =~ s/\"//g;
-  $code .=';return $condition;';
-
-  push( @Apache::structuretags::whileconds, $code); 
-  my $result = &Apache::run::run($code,$safeeval);
-  my $bodytext=$$parser[$#$parser]->get_text("/while");
-  push( @Apache::structuretags::whilebody, $bodytext);
-  if ( $result ) { 
-    &Apache::lonxml::newparser($parser,\$bodytext);
-  }
-  return "";
+    my $result;
+    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
+	$target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+	my $code = $token->[2]->{'condition'};
+
+	push( @Apache::structuretags::whileconds, $code);
+	if (!$Apache::lonxml::default_homework_loaded) {
+	    &Apache::lonxml::default_homework_load($safeeval);
+	}
+	my $result = &Apache::run::run($code,$safeeval);
+	my $bodytext=&Apache::lonxml::get_all_text("/while",$parser,$style);
+	push( @Apache::structuretags::whilebody, $bodytext);
+	push( @Apache::structuretags::whileline, $token->[5]);
+	&Apache::lonxml::debug("s code $code got -$result-");
+	if ( $result ) {
+	    &Apache::lonxml::newparser($parser,\$bodytext);
+	}
+    } elsif ($target eq 'edit') {
+	$result .=&Apache::edit::tag_start($target,$token);
+	$result .=&Apache::edit::text_arg(&mt('Test Condition:'),'condition',
+					  $token,40);
+	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'condition');
+	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+    }
+    return $result;
 }
 
 sub end_while {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $code = pop @Apache::structuretags::whileconds;
-  my $bodytext = pop @Apache::structuretags::whilebody;
-  my $result = &Apache::run::run($code,$safeeval);
-  if ( $result ) { 
-    &Apache::lonxml::newparser($parser,\$bodytext);
-  } 
-  return "";
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+
+    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
+	$target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+	my $code = pop(@Apache::structuretags::whileconds);
+	my $bodytext = pop(@Apache::structuretags::whilebody);
+	my $line = pop(@Apache::structuretags::whileline);
+	my $return = &Apache::run::run($code,$safeeval);
+	my $starttime=time;
+	my $error=0;
+	while ($return) {
+	    if (time-$starttime >
+		$Apache::lonnet::perlvar{'lonScriptTimeout'}) {
+		$return = 0; $error=1; next;
+	    }
+	    $result.=&Apache::scripttag::xmlparse($bodytext);
+	    if ($target eq 'grade' || $target eq 'answer' ||
+		$target eq 'analyze') {
+		# grade/answer/analyze should produce no output but if we
+		# are redirecting, the redirecter should know what to do
+		# with the output
+		if (!$Apache::lonxml::redirection) { undef($result); }
+	    }
+	    $return = &Apache::run::run($code,$safeeval);
+	}
+	if ($error) {
+	    &Apache::lonxml::error('<pre>'.&mt('Code ran too long. It ran for more than').' '.$Apache::lonnet::perlvar{'lonScriptTimeout'}.' '.&mt('seconds occurred while running &lt;while&gt; on line').' '.$line.'</pre>');
+	}
+    } elsif ($target eq "edit") {
+	$result.= &Apache::edit::tag_end($target,$token,'');
+    }
+    return $result;
 }
 
-# <randomlist> 
+# <randomlist show="1">
 #  <tag1>..</tag1>
 #  <tag2>..</tag2>
 #  <tag3>..</tag3>
-#  ... 
+#  ...
 # </randomlist>
 sub start_randomlist {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
-  my $b_parser= HTML::TokeParser->new(\$body);
-  my $b_tok;
-  my @randomlist;
-  my $list_item;
-
-  while($b_tok = $b_parser->get_token() ) {
-    if($b_tok->[0] eq 'S') { # start tag
-    # get content of the tag until matching end tag
-    # get all text upto the matching tag
-    # and push the content into @randomlist
-      $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
-      $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
-      push(@randomlist,$list_item);
-   #  print "<BR><B>START-TAG $b_tok->[1], $b_tok->[4], $list_item</B>";
-    }
-    if($b_tok->[0] eq 'T') { # text
-    # what to do with text in between tags?
-      #  print "<B>TEXT $b_tok->[1]</B><BR>";
-    }
-    # if($b_tok->[0] eq 'E') { # end tag, should not happen
-      #  print "<B>END-TAG $b_tok->[1]</B><BR>";
-    # }
-  }
-  my @idx_arr = (0 .. $#randomlist);
-  &Apache::structuretags::shuffle(\@idx_arr);
-  my $bodytext = '';
-  for(0 .. $#randomlist) {
-    $bodytext .= "$randomlist[ $idx_arr[$_] ]";
-  }
-
-  &Apache::lonxml::newparser($parser,\$bodytext);
-  return "";
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result;
+    if ($target eq 'answer' || $target eq 'grade'   || $target eq 'web' ||
+	$target eq 'tex'    || $target eq 'analyze' || $target eq 'webgrade') {
+	my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
+	my $b_parser= HTML::LCParser->new(\$body);
+	$b_parser->xml_mode(1);
+	$b_parser->marked_sections(1);
+	my $b_tok;
+	my @randomlist;
+	my $list_item;
+	while($b_tok = $b_parser->get_token() ) {
+	    if($b_tok->[0] eq 'S') { # start tag
+		# get content of the tag until matching end tag
+		# get all text upto the matching tag
+		# and push the content into @randomlist
+		$list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],
+							   $b_parser);
+		$list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
+		push(@randomlist,$list_item);
+		#  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4],
+                #         $list_item</b>";
+	    }
+	    if($b_tok->[0] eq 'T') { # text
+		# what to do with text in between tags?
+		#  print "<b>TEXT $b_tok->[1]</b><br />";
+	    }
+	    # if($b_tok->[0] eq 'E') { # end tag, should not happen
+	    #  print "<b>END-TAG $b_tok->[1]</b><br />";
+	    # }
+	}
+	if (@randomlist) {
+	    my @idx_arr = (0 .. $#randomlist);
+	    &Apache::structuretags::shuffle(\@idx_arr);
+	    my $bodytext = '';
+	    my $show=$#randomlist;
+	    my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
+	    $showarg--;
+	    if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
+            if (($target eq 'analyze') && ($env{'form.check_parts_withrandomlist'})) {
+                my @currlist;
+                my $part = $Apache::inputtags::part;
+                if ($part ne '') {
+                    if (ref($Apache::lonhomework::analyze{'parts_withrandomlist'}) eq 'ARRAY') {
+                        my @currlist = @{$Apache::lonhomework::analyze{'parts_withrandomlist'}};
+                        if (!(grep(/^\Q$part\E$/,@currlist))) {
+                            push(@{$Apache::lonhomework::analyze{'parts_withrandomlist'}},$part);
+                        }
+                    } else {
+                        push(@{$Apache::lonhomework::analyze{'parts_withrandomlist'}},$part);
+                    }
+                }
+            }
+	    for(0 .. $show) {
+		$bodytext .= "$randomlist[ $idx_arr[$_] ]";
+	    }
+	    &Apache::lonxml::newparser($parser,\$bodytext);
+	}
+    } elsif ($target eq 'edit' ) {
+	$result .=&Apache::edit::tag_start($target,$token);
+	$result .=&Apache::edit::text_arg('Maximum Tags to Show:','show',
+					   $token,5);
+	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified' ) {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'show');
+	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+    }
+    return $result;
 }
 
 sub shuffle {
     my $a=shift;
     my $i;
-    for($i=@$a;--$i;) {
-      my $j=int rand($i+1);
-      next if $i == $j;
-      @$a[$i,$j] = @$a[$j,$i];
+    if (ref($a) eq 'ARRAY' && @$a) {
+	&Apache::response::pushrandomnumber();
+	for($i=@$a;--$i;) {
+	    my $j=int(&Math::Random::random_uniform() * ($i+1));
+	    next if $i == $j;
+	    @$a[$i,$j] = @$a[$j,$i];
+	}
+	&Apache::response::poprandomnumber();
     }
 }
 
 sub end_randomlist {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+    if ($target eq 'edit' ) {
+	$result=&Apache::edit::tag_end($target,$token,
+				       'End Randomly Parsed Block');
+    }
+    return $result;
 }
 
+sub ordered_show_check {
+    my $last_part=$Apache::inputtags::partlist[-2];
+    my $in_order=
+	&Apache::lonnet::EXT('resource.'.$Apache::inputtags::part.'.ordered');
+    my $in_order_show=1;
+    if ($last_part ne '0' && lc($in_order) eq 'yes') {
+	$in_order_show=&Apache::response::check_status($last_part);
+    }
+    return $in_order_show;
+}
+
+
+sub start_startpartmarker {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result='';
+    if ($target eq 'edit') {
+        $result=&Apache::edit::tag_start($target,$token);
+        $result.=&mt('Marker for the start of a part. Place end marker below to wrap in-between tags into a new part.').'</td></tr>';
+        $result.=&Apache::edit::end_table();
+
+    } 
+    return $result;
+}
+
+sub end_startpartmarker {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my @result;
+    if ($target eq 'edit') { $result[1]='no'; }
+    return @result;
+}
+
+sub start_endpartmarker {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result='';
+    if ($target eq 'edit') {
+        $result=&Apache::edit::tag_start($target,$token);
+        $result.=&mt('Marker for the end of a part. Place start marker above to wrap in-between tags into a new part.').'</td></tr>';
+        $result.=&Apache::edit::end_table();
+
+    }
+    return $result;
+}
+
+sub end_endpartmarker {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my @result;
+    if ($target eq 'edit') { $result[1]='no'; }
+    return @result;
+}
+
+
+
+
+
 sub start_part {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $args ='';
-  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-  my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
-  $Apache::inputtags::part=$id;
-  @Apache::inputtags::responselist = ();
-  if ($target eq 'meta') {
-    return &Apache::response::mandatory_part_meta;
-  } else {
-    my ($status,$datemsg) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
-    push (@Apache::inputtags::status,$status);
-    my $expression='$external::datestatus="'.$status.'";';
-    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    if (!$Apache::lonxml::metamode) {
+	&Apache::lonxml::startredirection(); # we'll use redirection to fix up 
+	                                     # duedates.
+    }
+    my $result='';
+    my $id= &Apache::lonxml::get_id($parstack,$safeeval);
+    $Apache::inputtags::part=$id;
+    push(@Apache::inputtags::partlist,$id);
+    @Apache::inputtags::response=();
+    @Apache::inputtags::previous=();
+    @Apache::inputtags::previous_version=();
+    &Apache::lonhomework::set_show_problem_status(&get_problem_status($id));
+    &Apache::response::reset_params();
+
+    my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
+    my $newtype=&Apache::lonnet::EXT("resource.$id.type");
+    if ($newtype) { $Apache::lonhomework::type=$newtype; }
+    my $in_order_show=&ordered_show_check();
+    my $expression='$external::part=\''.$Apache::inputtags::part.'\';';
+    $expression.='$external::type=\''.$Apache::lonhomework::type.'\';';
     &Apache::run::run($expression,$safeeval);
-    if ( $status eq 'CLOSED' ) {
-      my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
-      if ( $target eq "web" ) {
-	return "<br></br>Part is not open to be viewed. It $datemsg<br></br>";
-      }
+
+    if ($target eq 'meta') {
+	my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
+	return &Apache::response::mandatory_part_meta.
+	       &Apache::response::meta_parameter_write('display','string',$display,'Part Description');
+    } elsif ($target eq 'web' || $target eq 'grade' ||
+	     $target eq 'answer' || $target eq 'tex') {
+	if ($hidden || !$in_order_show) {
+	    my $bodytext=&Apache::lonxml::get_all_text("/part",$parser,$style);
+	} else {
+	    my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
+	    push (@Apache::inputtags::status,$status);
+	    my $expression='$external::datestatus="'.$status.'";';
+	    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
+	    &Apache::run::run($expression,$safeeval);
+	    if ($env{'request.state'} eq 'construct') {
+		&set_problem_state($Apache::inputtags::part); 
+	    }
+	    if (( $status eq 'CLOSED' ) ||
+		( $status eq 'UNCHECKEDOUT') ||
+		( $status eq 'NOT_YET_VIEWED') ||
+		( $status eq 'BANNED') ||
+		( $status eq 'UNAVAILABLE') ||
+		( $status eq 'INVALID_ACCESS')) {
+		my $bodytext=&Apache::lonxml::get_all_text("/part",$parser,
+							   $style);
+		if ( $target eq "web" ) {
+		    $result="<br />".&mt('Part is not open to be viewed. It')." $accessmsg<br />";
+		} elsif ( $target eq 'tex' ) {
+		    if (not $env{'form.problem_split'}=~/yes/) {
+			$result="\\end{minipage}\\vskip 0 mm ".&mt('Part is not open to be viewed. It')." $accessmsg \\\\\\begin{minipage}{\\textwidth}";
+		    } else {
+			$result="\\vskip 0 mm ".&mt('Part is not open to be viewed. It')." $accessmsg \\\\";
+		    }
+		}
+	    } else {
+		if ($target eq 'tex') {
+		    if (not $env{'form.problem_split'}=~/yes/) {
+			if ($$tagstack[-2] eq 'td') {
+			    $result.='\noindent \begin{minipage}{\textwidth}\noindent';
+			} else {
+			    $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
+			}
+		    }
+		    my $weight = &Apache::lonnet::EXT("resource.$id.weight");
+		    my $allkeys=&Apache::lonnet::metadata($env{'request.uri'},'packages');
+		    my @allkeys = split /,/,$allkeys;
+		    my $allow_print_points = 0;
+		    foreach my $partial_key (@allkeys) {
+			if ($partial_key=~m/^part_(.*)$/) {
+			    if ($1 ne '0') {$allow_print_points=1;}
+			}
+		    }
+		    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
+		    if (defined($maxtries) && $maxtries < 0) {
+			$allow_print_points=0;
+		    }
+		    if (lc($env{'course.'.$env{'request.course.id'}.
+				    '.disableexampointprint'}) eq 'yes') {
+			$allow_print_points=0;
+		    }
+		    if (($Apache::lonhomework::type eq 'exam') && ($allow_print_points)) { 
+			$result .= '\vskip 10mm\fbox{\textit{'.&mt('[quant,_1,pt,pt]',$weight ).'}}';
+
+		    }
+		} elsif ($target eq 'web') {
+                    if ($status eq 'CAN_ANSWER') {
+                        my $problemstatus = &get_problem_status($Apache::inputtags::part); 
+                        my $probrandomize = &Apache::lonnet::EXT("resource.$Apache::inputtags::partlist[0].type");
+                        my $probrandtries = &Apache::lonnet::EXT("resource.$Apache::inputtags::partlist[0].randomizeontries");
+                        my $num = scalar(@Apache::inputtags::partlist)-1;
+                        if ($probrandomize eq 'randomizetry') {
+                            if (&Apache::lonnet::EXT("resource.$Apache::inputtags::part.type") ne 'randomizetry') {
+                                $result .= &randomizetry_part_header($problemstatus,'none',$num);
+                            } else {
+                                my $reqtries = &Apache::lonnet::EXT("resource.$Apache::inputtags::part.randomizeontries");
+                                if ($probrandtries ne $reqtries) {
+                                    $result .= &randomizetry_part_header($problemstatus,$reqtries,$num);
+                                }
+                            }
+                        } elsif (&Apache::lonnet::EXT("resource.$Apache::inputtags::part.type") eq 'randomizetry') {
+                            my $reqtries = &Apache::lonnet::EXT("resource.$Apache::inputtags::part.randomizeontries");
+                            $result .= &randomizetry_part_header($problemstatus,$reqtries,$num);
+                        }
+                    }
+		    $result.='<a name="'.&escape($Apache::inputtags::part).'" ></a>';
+		}
+	    }
+	}
+    } elsif ($target eq 'edit') {
+	$result.=&Apache::edit::tag_start($target,$token);
+	$result.=&Apache::edit::text_arg('Part ID:','id',$token).
+	    &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
+	    '&nbsp;&nbsp;'.
+&Apache::edit::text_arg('Displayed Part Description:','display',$token).
+		&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'id','display');
+	if ($constructtag) {
+	    #limiting ids to only letters numbers, and space
+	    $token->[2]->{'id'}=~s/[^A-Za-z0-9 ]//gs;
+	    $result = &Apache::edit::rebuild_tag($token);
+	}
     }
-  }
-  return '';
+    return $result;
 }
 
 sub end_part {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  &Apache::lonxml::debug("in end_part $target ");
-  pop @Apache::inputtags::status;
-  if ( $target eq 'meta' ) { return ''; }
-  if ( $target eq 'grade' ) { return &Apache::inputtags::grade; }
-  return &Apache::inputtags::gradestatus($Apache::inputtags::part);
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    &Apache::lonxml::debug("in end_part $target ");
+    my $status=$Apache::inputtags::status['-1'];
+    my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
+    my $in_order_show=&ordered_show_check();
+    my $result;
+    if (!$Apache::lonxml::metamode) {
+	$result = &Apache::lonxml::endredirection(); # started in &start_part
+	$Apache::lonxml::post_evaluate=0;
+    }
+    if ($target eq 'grade') {
+	if (($status eq 'CAN_ANSWER' || $Apache::lonhomework::scantronmode) &&
+	    !$hidden && $in_order_show) {
+	    $result.=&Apache::inputtags::grade;
+	} else {
+	    # move any submission data to .hidden
+	    &Apache::inputtags::hidealldata($Apache::inputtags::part);
+	}
+    } elsif (($target eq 'web' || $target eq 'tex') &&
+	     !$hidden && $in_order_show) {
+	my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
+							$target);
+	if (($Apache::lonhomework::type eq 'exam' && $target eq 'tex') ||
+             ($env{'form.grade_imsexport'})) {
+	    $gradestatus='';
+	}
+	$result.=$gradestatus;
+	if ($$tagstack[-2] eq 'td' and $target eq 'tex') {$result.='\end{minipage}';} 
+    } elsif ($target eq 'edit') {
+	$result.=&Apache::edit::end_table();
+    } elsif ($target eq 'modified') {
+	 $result .= $token->[2];
+    }
+    pop @Apache::inputtags::status;
+    $Apache::inputtags::part='';
+    $Apache::lonhomework::type = $Apache::lonhomework::default_type;
+    return $result;
 }
 
 sub start_preduedate {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  if ($target ne 'meta') {
-    if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER') {
-      &Apache::lonxml::get_all_text("/pre_duedate",$$parser[$#$parser]);
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    if ($target eq 'web' || $target eq 'grade'    || $target eq 'answer' ||
+	$target eq 'tex' || $target eq 'webgrade') {
+	&Apache::lonxml::debug("State in preduedate is ". $Apache::inputtags::status['-1']);
+	if (!$Apache::lonhomework::scantronmode &&
+	    $Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
+	    $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER') {
+	    &Apache::lonxml::debug("Wha? ". ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER'));
+	    &Apache::lonxml::get_all_text("/preduedate",$parser,$style);
+	}
     }
-  }
-  return '';
+    return '';
 }
 
 sub end_preduedate {
-  return '';
+    return '';
 }
 
+# In all the modes where <postanswerdate> text is 
+# displayable,  all we do is eat up the text between the start/stop
+# tags if the conditions are not right to display it.
 sub start_postanswerdate {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  if ($target ne 'meta') {
-    if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
-      &Apache::lonxml::get_all_text("/post_answerdate",$$parser[$#$parser]);
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $pav = &Apache::lonnet::allowed('pav', $env{'request.course.id'}) ||
+	&Apache::lonnet::allowed('pav',
+			   $env{'request.course.id'}.'/'.$env{'request.course.sec'});
+    if ($target eq 'web' || $target eq 'grade' || $target eq 'webgrade' ||
+	$target eq 'tex' ) {
+	if ($Apache::lonhomework::scantronmode ||
+	    $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER' ||
+	    (($target eq 'tex') && !$pav)) {
+	    &Apache::lonxml::get_all_text("/postanswerdate",$parser,$style);
+	}
     }
-  }
-  return '';
+    return '';
 }
 
 sub end_postanswerdate {
-  return '';
+    return '';
 }
 
 sub start_notsolved {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  if ($target ne 'meta') {
-    my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
-    &Apache::lonxml::debug("not solved has :$gradestatus:");
-    if ($gradestatus =~ /^correct/) {
-      &Apache::lonxml::debug("skipping");
-      &Apache::lonxml::get_all_text("/not_solved",$$parser[$#$parser]);
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
+	$target eq 'tex' || $target eq 'webgrade') {
+	my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
+	&Apache::lonxml::debug("not solved has :$gradestatus:");
+	if ($gradestatus =~ /^correct/ &&
+	    &Apache::response::show_answer()) {
+	    &Apache::lonxml::debug("skipping");
+	    &Apache::lonxml::get_all_text("/notsolved",$parser,$style);
+	}
     }
-  }
-  return '';
+    return '';
 }
 
 sub end_notsolved {
-  return '';
+    return '';
 }
 
 sub start_solved {
-  my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  if ($target ne 'meta') {
-    my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
-    if ($gradestatus !~ /^correct/) {
-      &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
+	$target eq 'tex') {
+	my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
+	if ($gradestatus !~ /^correct/ ||
+	    !&Apache::response::show_answer()) {
+	    &Apache::lonxml::get_all_text("/solved",$parser,$style);
+	}
     }
-  }
-  return '';
+    return '';
 }
 
 sub end_solved {
-  return '';
+    return '';
 }
+
+sub start_problemtype {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result;
+    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
+	$target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
+	my $mode=lc(&Apache::lonxml::get_param('mode',$parstack,$safeeval));
+	if (!defined($mode)) { $mode='show'; }
+	my $for=&Apache::lonxml::get_param('for',$parstack,$safeeval);
+	my $found=0;
+	foreach my $type (split(',',$for)) {
+	    if ($Apache::lonhomework::type eq lc($type)) { $found=1; }
+	}
+	if ($mode eq 'show' && !$found) {
+	    &Apache::lonxml::get_all_text("/problemtype",$parser,$style);
+	}
+	if ($mode eq 'hide' && $found) {
+	    &Apache::lonxml::get_all_text("/problemtype",$parser,$style);
+	}
+    } elsif ($target eq 'edit') {
+	$result .=&Apache::edit::tag_start($target,$token);
+	$result.=&Apache::edit::select_arg('Mode:','mode',
+					   [['show','Show'],
+					    ['hide','Hide']]
+					   ,$token);
+	$result .=&Apache::edit::checked_arg('When used as type(s):','for',
+					     [ ['exam','Exam/Quiz Problem'],
+					       ['survey','Survey'],
+                                               ['surveycred','Survey (with credit)'],
+                                               ['anonsurvey','Anonymous Survey'],
+                                               ['anonsurveycred','Anonymous Survey (with credit)'],
+					       ['problem','Homework Problem'],
+                                               ['practice','Practice Problem'],
+                                               ['randomizetry','New Randomization Each Try'] ]
+					     ,$token);
+	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'mode','for');
+	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+    }
+    return $result;
+}
+
+sub end_problemtype {
+    return '';
+}
+
+sub start_startouttext {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my @result=(''.'');
+    if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
+    
+    my $nesting = 
+	&Apache::lonxml::set_state('outtext',
+				   &Apache::lonxml::get_state('outtext')+1);
+    if ($nesting > 1 && $env{'request.state'} eq 'construct') {
+	&Apache::lonxml::error("Nesting of &lt;startouttext /&gt; not allowed, on line ".$token->[5]);
+    }
+    return (@result);
+}
+
+sub end_startouttext {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result='';
+    my $text='';
+    if ($target eq 'edit') {
+	my $areaid = 'homework_edit_'.$Apache::lonxml::curdepth;
+	$text=&Apache::lonxml::get_all_text("endouttext",$parser,$style);
+	$result.=&Apache::edit::start_table($token)."<tr><td>".&mt('Text Block')."</td>"
+                 .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
+                 .&Apache::edit::deletelist($target,$token)
+                 .'</span></td>'
+	         .'<td align="left"><span id="math_'.$areaid.'" />'
+		 .&Apache::lonhtmlcommon::dragmath_button($areaid,1)
+		 .'<span></td>'
+		 .'<td>'
+		 .&Apache::edit::insertlist($target,$token)
+		 .'</td>'
+	         .'<td align="right" valign="top">' .
+	         &Apache::loncommon::helpLatexCheatsheet().
+		 &Apache::edit::end_row().
+                 &Apache::edit::start_spanning_row()."\n".
+		 &Apache::edit::editfield($token->[1],$text,"",80,8,1);
+    }
+    if ($target eq 'modified') {
+	$result='<startouttext />'.&Apache::edit::modifiedfield("endouttext",$parser);
+    }
+    if ($target eq 'tex') {
+	$result .= '\noindent ';
+    }
+    return $result;
+}
+
+sub start_endouttext {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result='';
+    if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
+    if ($target eq "modified") {
+	$result='<endouttext />'.
+	    &Apache::edit::handle_insertafter('startouttext');
+    }
+
+    my $nesting = 
+	&Apache::lonxml::set_state('outtext',
+				   &Apache::lonxml::get_state('outtext')-1);
+    if ($nesting < 0 && $env{'request.state'} eq 'construct') {
+	&Apache::lonxml::error(" Extraneous &lt;endouttext /&gt; not allowed on line ".$token->[5]);
+	&Apache::lonxml::set_state('outtext', 0);
+    }
+    return $result;
+}
+
+sub end_endouttext {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my @result=('','');
+    if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
+    return (@result);
+}
+
+sub delete_startouttext {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    #  my $text=&Apache::lonxml::get_all_text("endouttext",$parser,$style);
+    my $text=$$parser['-1']->get_text("/endouttext");
+    my $ntoken=$$parser['-1']->get_token();
+    &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
+    &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
+    # Deleting 2 parallel tag pairs, but we need the numbers later to look like
+    # they did the last time round
+    &Apache::lonxml::increasedepth($ntoken);
+    &Apache::lonxml::decreasedepth($ntoken);
+    return 1;
+}
+
+sub start_simpleeditbutton {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result='';
+    if (($env{'form.simple_edit_button'} ne 'off') &&
+	($target eq 'web') &&
+        (&Apache::lonnet::allowed('mdc',$env{'request.course.id'}))) {
+        my $url=$env{'request.noversionuri'};
+        $url=~s/\?.*$//;
+	my ($symb) = &Apache::lonnet::whichuser();
+#       Warning makes more sense and is more important on edit screen
+#       $result='<p class="LC_warning">'
+#              .&mt('Note: it can take up to 10 minutes for changes to take effect for all users.')
+#              .&Apache::loncommon::help_open_topic('Caching')
+#              .'</p>';
+        $result.=&Apache::loncommon::head_subbox(
+                 &Apache::lonhtmlcommon::start_funclist()
+                .&Apache::lonhtmlcommon::add_item_funclist(
+                     '<a href="'.$url.'/smpedit?symb='.&escape($symb).'">'
+                    .&mt('Edit').'</a>')
+                .&Apache::lonhtmlcommon::end_funclist());
+
+    }
+    return $result;
+}
+
+sub end_simpleeditbutton {
+    return '';
+}
+
+sub practice_problem_header {
+    return '<span class="LC_info"><h3>'.&mt('Practice Problem').'</h3></span>'.
+           '<span class="LC_info">'.&mt('Submissions are not permanently recorded').
+           '</span>';
+}
+
+sub randomizetry_problem_header {
+    my ($problemstatus,$reqtries) = @_;
+    my ($header,$text);
+    if ($reqtries > 1) {
+        $header = &mt('New Problem Variation After Every [quant,_1,Try,Tries]',$reqtries);
+        if (($problemstatus eq 'no') ||
+            ($problemstatus eq 'no_feedback_ever')) {
+            $text = &mt('A new variation will be generated after every [quant,_1,try,tries], until the tries limit is reached.',$reqtries);
+        } else {
+            $text = &mt('A new variation will be generated after every [quant,_1,try,tries], until correct or tries limit is reached.',$reqtries);
+        }
+    } else {
+        $header = &mt('New Problem Variation Each Try');
+        if (($problemstatus eq 'no') ||
+            ($problemstatus eq 'no_feedback_ever')) {
+            $text = &mt('A new variation will be generated after each try until the tries limit is reached.');
+
+        } else {
+            $text = &mt('A new variation will be generated after each try until correct or tries limit is reached.');
+        }
+    }
+    return '<span class="LC_info"><h3>'.$header.'</h3></span>'.
+           '<span class="LC_info">'.$text.'</span><hr />';
+}
+
+sub randomizetry_part_header {
+    my ($problemstatus,$reqtries,$num) = @_;
+    my ($header,$text);
+    if ($reqtries eq 'none') {
+        $header = &mt('No Question Variation');
+        $text = &mt('For this question there will no new variation after a try.');
+    } elsif ($reqtries > 1) {
+        $header = &mt('New Question Variation After Every [quant,_1,Try,Tries]',$reqtries);
+        if (($problemstatus eq 'no') ||
+            ($problemstatus eq 'no_feedback_ever')) {
+            $text = &mt('For this question a new variation will be generated after every [quant,_1,try,tries], until the tries limit is reached.',$reqtries);
+        } else {
+            $text = &mt('For this question a new variation will be generated after every [quant,_1,try,tries], until correct or tries limit is reached.',$reqtries);
+        }
+    } else {
+        $header = &mt('New Question Variation For Each Try');
+        if (($problemstatus eq 'no') ||
+            ($problemstatus eq 'no_feedback_ever')) {
+            $text =  &mt('For this question a new variation will be generated after each try until the tries limit is reached.');
+        } else {
+            $text = &mt('For this question a new variation will be generated after each try until correct or tries limit is reached.');
+        }
+    }
+    my $output;
+    if ($num > 1) {
+        $output .= '<hr />';
+    }
+    $output .=  '<span class="LC_info"><h4>'.$header.'</h4></span>'.
+                  '<span class="LC_info">'.$text.'</span><br /><br />';
+    return $output;
+}
+
 1;
 __END__
+
+=pod
+
+=back
+
+=cut