# The LearningOnline Network with CAPA
# definition of tags that give a structure to a document
# 2/19 Guy
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','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",$$parser[$#$parser]);
if ($target eq 'web') {
return $bodytext;
}
return '';
}
sub end_web {
}
sub start_tex {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
if ($target eq 'tex') {
return $bodytext
}
return '';
}
sub end_tex {
}
sub start_problem {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
#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;
#should get back a <html> or the neccesary stuff to start XML/MathML
my $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,$parser,$safeeval);
my $head_tag_start='<head>'.&Apache::lonxml::registerurl();
my $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
'onUnload="'.&Apache::lonxml::unloadevents().'" '.
'bgcolor="#FFFFFF">';
if ($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_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",$$parser[$#$parser]);
my $b_parser= HTML::TokeParser->new(\$body);
my $b_tok;
my @randomlist;
my $list_item;
while($b_tok = $b_parser->get_token() ) {
if($b_tok->[0] eq 'S') { # start tag
# get content of the tag until matching end tag
# get all text upto the matching tag
# and push the content into @randomlist
$list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
$list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
push(@randomlist,$list_item);
# print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
}
if($b_tok->[0] eq 'T') { # text
# what to do with text in between tags?
# print "<b>TEXT $b_tok->[1]</b><br />";
}
# if($b_tok->[0] eq 'E') { # end tag, should not happen
# print "<b>END-TAG $b_tok->[1]</b><br />";
# }
}
my @idx_arr = (0 .. $#randomlist);
&Apache::structuretags::shuffle(\@idx_arr);
my $bodytext = '';
for(0 .. $#randomlist) {
$bodytext .= "$randomlist[ $idx_arr[$_] ]";
}
&Apache::lonxml::newparser($parser,\$bodytext);
return "";
}
sub shuffle {
my $a=shift;
my $i;
for($i=@$a;--$i;) {
my $j=int rand($i+1);
next if $i == $j;
@$a[$i,$j] = @$a[$j,$i];
}
}
sub end_randomlist {
}
sub start_part {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
$Apache::inputtags::part=$id;
@Apache::inputtags::responselist = ();
if ($target eq 'meta') {
return &Apache::response::mandatory_part_meta;
} elsif ($target eq 'web' || $target eq 'grade') {
my ($status,$datemsg) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
push (@Apache::inputtags::status,$status);
my $expression='$external::datestatus="'.$status.'";';
$expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
&Apache::run::run($expression,$safeeval);
if ( $status eq 'CLOSED' ) {
my $bodytext=&Apache::lonxml::get_all_text("/part",$$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",$$parser[$#$parser]);
$result=
&Apache::edit::tag_start($target,$token).
&Apache::edit::editfield($token->[1],$text,"Text Block",50,5);
}
if ($target eq 'modified') {
$text=&Apache::lonxml::get_all_text("endouttext",$$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" ) { $result=&Apache::edit::tag_end($target,$token); }
if ($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);
}
1;
__END__
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