File:  [LON-CAPA] / loncom / homework / structuretags.pm
Revision 1.48: download - view: text, annotated - select for diffs
Wed Jul 18 20:08:34 2001 UTC (22 years, 8 months ago) by albertel
Branches: MAIN
CVS tags: HEAD
- added support for .library and <library>

# The LearningOnline Network with CAPA 
# definition of tags that give a structure to a document
# 2/19 Guy
# 6/26/2001 fixed extra web display at end of <web></web> tags
package Apache::structuretags; 

use strict;
use Apache::lonnet;

sub BEGIN {
  &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
#  &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
}

sub start_web {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
  if ($target eq 'web') {
    return $bodytext;
  } 
  return '';
}

sub end_web {
    return '';
}

sub start_tex {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
  if ($target eq 'tex') {
    return $bodytext
  }
  return '';
}

sub end_tex {
    return '';
}

sub page_start {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,$parser,$safeeval);
  my $head_tag_start='<head>'.&Apache::lonxml::registerurl();
  my $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
	  'onUnload="'.&Apache::lonxml::unloadevents().'" '.
	    'bgcolor="#FFFFFF">';
  return ($result,$head_tag_start,$body_tag_start);
}

sub start_problem {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;

#intialize globals
  $Apache::inputtags::part='0';
  @Apache::inputtags::responselist = ();
  $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
  &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
  if ($Apache::lonhomework::type eq '') {
    $Apache::lonhomework::type='homework';
  }
#adeed vars to the scripting enviroment
  my $expression='$external::part='.$Apache::inputtags::part.';';
  &Apache::run::run($expression,$safeeval);
  my $status;
  my $datemsg;

  #should get back a <html> or the neccesary stuff to start XML/MathML
  my ($result,$head_tag_start,$body_tag_start)=
    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);

  if ($target eq 'web' || $target eq 'grade') {
    ($status,$datemsg) = &Apache::lonhomework::check_date('0');
    push (@Apache::inputtags::status,$status);
    my $expression='$external::datestatus="'.$status.'";';
    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
    &Apache::run::run($expression,$safeeval);
    if ( $status eq 'CLOSED' ) {
      my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
      if ( $target eq "web" ) {
	$result.= $head_tag_start.'</head>';
	return $result . $body_tag_start .
	  " <br />Problem is not open to be viewed. The problem $datemsg<br />";
      }
    }
  }
  if ($target eq 'web') {
    my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
    if ($name eq '') { 
      $name=&Apache::lonnet::EXT('resource.title');
      if ($name eq 'con_lost') { $name = ''; }
    }
    $Apache::lonhomework::name=$name;
    if ($status eq 'CAN_ANSWER') {
      # create a page header and exit
      $result.="$head_tag_start<title>$name</title></head>\n
              $body_tag_start\n
              <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
		'<input type="hidden" name="submitted" value="yes" />';
      if ($ENV{'request.state'} eq "construct") {
	$result.='<input type="hidden" name="problemmode" value="View" />
                 <input type="submit" name="problemmode" value="Edit" /><hr />';
      }
      return $result;
    } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' || $status eq 'CLOSED') {
      return $result.$head_tag_start."<title>$name</title></head>\n$body_tag_start\n";
    }
  }
  if ($target eq 'edit') {
    $result.=$head_tag_start."</head>".$body_tag_start.
      '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
       <input type="hidden" name="submitted" value="edit" />
       <input type="hidden" name="problemmode" value="Edit" />
       <input type="submit" name="problemmode" value="View" />
       <input type="submit" name="Undo" value="undo" /> <hr />
      ';
    my $temp=&Apache::edit::insertlist($target,$token);
    $result.=$temp;
    return $result;
  }
  if ($target eq 'modified') {
    $result=$token->[4];
    $result.=&Apache::edit::handle_insert();
    return $result;
  }
  return '';
}

sub end_problem {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $result='';
  my $status=$Apache::inputtags::status['-1'];
  if ($target eq 'grade' || $target eq 'web' ) {
    if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
       $status eq 'CAN_ANSWER') {
      # if part is zero, no <part>s existed, so we need to the grading
      &Apache::inputtags::grade;
    } elsif ($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' || $status eq 'CANNOT_ANSWER') {
	$result.="</body>\n";
      }
    }
  }
  if ($target eq 'meta') {
    if ($Apache::inputtags::part eq '0') {
      $result=&Apache::response::mandatory_part_meta;
    }
  }
  if ($target eq 'edit') {
    &Apache::lonxml::debug("in end_problem with $target, edit");
    $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
  }
  return $result;
}

sub start_library {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my ($result,$head_tag_start,$body_tag_start)=
    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
  if ($target eq 'edit') {
    $result.=$head_tag_start."</head>".$body_tag_start.
      '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
       <input type="hidden" name="submitted" value="edit" />
       <input type="hidden" name="problemmode" value="Edit" />
       <input type="submit" name="problemmode" value="View" />
       <input type="submit" name="Undo" value="undo" /> <hr />
      ';
    my $temp=&Apache::edit::insertlist($target,$token);
    $result.=$temp;
    return $result;
  }
  if ($target eq 'modified') {
    $result=$token->[4];
    $result.=&Apache::edit::handle_insert();
    return $result;
  }
  return '';
}

sub end_library {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $result='';
  if ($target eq 'edit') {
    $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
  }
  return $result;
}

sub start_block {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;

  if ($target eq 'web' || $target eq 'grade') {
    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 "";
}

sub end_block {
  return '';
}

sub start_while {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;

  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 "";
}

sub end_while {
  my ($target,$token,$tagstack,$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 "";
}

# <randomlist> 
#  <tag1>..</tag1>
#  <tag2>..</tag2>
#  <tag3>..</tag3>
#  ... 
# </randomlist>
sub start_randomlist {
  my ($target,$token,$tagstack,$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 "";
}

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];
    }
}

sub end_randomlist {
  return '';
}

sub start_part {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
  if ($id eq '') { $id = $Apache::lonxml::curdepth; }
  $Apache::inputtags::part=$id;
  @Apache::inputtags::responselist = ();
  if ($target eq 'meta') {
    return &Apache::response::mandatory_part_meta;
  } elsif ($target eq 'web' || $target eq 'grade') {
    my ($status,$datemsg) = &Apache::lonhomework::check_date($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 ( $status eq 'CLOSED' ) {
      my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
      if ( $target eq "web" ) {
	return "<br />Part is not open to be viewed. It $datemsg<br />";
      }
    }
  }
  return '';
}

sub end_part {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  &Apache::lonxml::debug("in end_part $target ");
  my $status=$Apache::inputtags::status['-1'];
  pop @Apache::inputtags::status;
  if ( $target eq 'meta' ) { return ''; }
  if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
    return &Apache::inputtags::grade;
  }
  if ($target eq 'web') {
    return &Apache::inputtags::gradestatus($Apache::inputtags::part);
  }
  return '';
}

sub start_preduedate {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  if ($target eq 'web' || $target eq 'grade') {
    if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
	$Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
      &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
    }
  }
  return '';
}

sub end_preduedate {
  return '';
}

sub start_postanswerdate {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  if ($target eq 'web' || $target eq 'grade') {
    if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
      &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
    }
  }
  return '';
}

sub end_postanswerdate {
  return '';
}

sub start_notsolved {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  if ($target eq 'web' || $target eq 'grade') {
    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("/notsolved",$$parser[$#$parser]);
    }
  }
  return '';
}

sub end_notsolved {
  return '';
}

sub start_solved {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  if ($target eq 'web' || $target eq 'grade') {
    my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
    if ($gradestatus !~ /^correct/) {
      &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
    }
  }
  return '';
}

sub end_solved {
  return '';
}

sub start_startouttext {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my @result=(''.'');
  if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
  return (@result);
}
sub end_startouttext {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $result='';
  my $text='';

  if ($target eq 'edit') {
    $text=&Apache::lonxml::get_all_text("endouttext",$$parser[$#$parser]);
    $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
<td>Delete:".
  &Apache::edit::deletelist($target,$token)
  ."</td>
<td>".
  &Apache::edit::insertlist($target,$token).
    "</td>
</tr><tr><td colspan=\"3\">\n".
	&Apache::edit::editfield($token->[1],$text,"",50,4);
  }
  if ($target eq 'modified') {
    $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
    $result='<startouttext />'.&Apache::edit::modifiedfield();
  }
  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 />'; }
  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)=@_;
#  my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
  my $text=$$parser['-1']->get_text("/endouttext");
  my $token=$$parser['-1']->get_token();
  &Apache::lonxml::debug("Deleting :$text: and :$token->[0]:$token->[1]:$token->[2]: for startouttext");
  &Apache::lonxml::end_tag($tagstack,$parstack,$token);
  # Deleting 2 parallel tag pairs, but we need the numbers later to look like 
  # they did the last time round
  &Apache::lonxml::increasedepth($token);
  &Apache::lonxml::decreasedepth($token);
  return 1;
}

1;
__END__

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