--- loncom/homework/structuretags.pm	2000/08/16 18:32:58	1.3
+++ loncom/homework/structuretags.pm	2001/05/13 20:01:34	1.37
@@ -1,14 +1,145 @@
-# The LearningOnline Network with CAPA
-# <script> definiton
-
-
+# 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'));
+  &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,$parstack,$parser,$safeeval)=@_;
+  my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
+  if ($target eq 'web') {
+    return $bodytext;
+  } 
+  return '';
+}
+
+sub end_web {
+}
+
+sub start_tex {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
+  if ($target eq 'tex') {
+    return $bodytext
+  }
+  return '';
+}
+
+sub end_tex {
+}
+
+sub start_problem {
+  my ($target,$token,$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;
+
+  my $result=&Apache::londefdef::start_html($target,$token,$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",$$parser[$#$parser]);
+      if ( $target eq "web" ) {
+	return $result."<body bgcolor=\"#FFFFFF\"> <br />Problem is not open to be viewed. The problem $datemsg<br />";
+      }
+    } 
+  }
+  if ($target eq 'web') {
+    my $args ='';
+    if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
+    my $name = &Apache::run::run("{$args;".'return $name}',$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
+      $result.="<head><title>$name</title></head>\n
+              <body bgcolor=\"#FFFFFF\">\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 $result."<title>$name</title>\n<body bgcolor=\"#FFFFFF\">\n";
+    }
+  }
+  if ($target eq 'edit') {
+    $result.='<body bgcolor="#FFFFFF">
+<form name="lonhomework" method="POST" action="'.$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 $temp=&Apache::edit::insertlist($token,$target);
+    $result.=$temp;
+    return $result;
+  }
+  if ($target eq 'modified') {
+    $result=$token->[4];
+    $result.=&Apache::edit::handle_insert();
+    return $result;
+  }
+  return '';
+}
+
+sub end_problem {
+  my ($target,$token,$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 {
@@ -17,12 +148,12 @@ sub start_block {
   my $code = @$parstack[$#$parstack];
   $code =~ s/\"//g;
   $code .=';return $condition;';
-#  print "<br>$code<br>";
+#  print "<br />$code<br />";
   my $result = &Apache::run::run($code,$safeeval);
+  &Apache::lonxml::debug("block :$code: returned :$result:");
   if ( ! $result ) { 
-#    my $skip=$$parser[$#$parser]->get_text("/block");
-    my $skip=&Apache::lonxml::get_all_text("block",$$parser[$#$parser]);
-#    print "skipped $skip";
+    my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
+    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
   }
   return "";
 }
@@ -30,5 +161,228 @@ sub start_block {
 sub end_block {
 }
 
+sub start_while {
+  my ($target,$token,$parstack,$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=$$parser[$#$parser]->get_text("/while");
+  push( @Apache::structuretags::whilebody, $bodytext);
+  if ( $result ) { 
+    &Apache::lonxml::newparser($parser,\$bodytext);
+  }
+  return "";
+}
+
+sub end_while {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my $code = pop @Apache::structuretags::whileconds;
+  my $bodytext = pop @Apache::structuretags::whilebody;
+  my $result = &Apache::run::run($code,$safeeval);
+  if ( $result ) { 
+    &Apache::lonxml::newparser($parser,\$bodytext);
+  } 
+  return "";
+}
+
+# <randomlist> 
+#  <tag1>..</tag1>
+#  <tag2>..</tag2>
+#  <tag3>..</tag3>
+#  ... 
+# </randomlist>
+sub start_randomlist {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my $body= &Apache::lonxml::get_all_text("/randomlist",$$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,$token,$parstack,$parser,$safeeval)=@_;
+  my $args ='';
+  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
+  my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
+  $Apache::inputtags::part=$id;
+  @Apache::inputtags::responselist = ();
+  if ($target eq 'meta') {
+    return &Apache::response::mandatory_part_meta;
+  } elsif ($target eq 'web' || $target eq 'grade') {
+    my ($status,$datemsg) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
+    push (@Apache::inputtags::status,$status);
+    my $expression='$external::datestatus="'.$status.'";';
+    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
+    &Apache::run::run($expression,$safeeval);
+    if ( $status eq 'CLOSED' ) {
+      my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
+      if ( $target eq "web" ) {
+	return "<br />Part is not open to be viewed. It $datemsg<br />";
+      }
+    }
+  }
+  return '';
+}
+
+sub end_part {
+  my ($target,$token,$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,$token,$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",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_preduedate {
+  return '';
+}
+
+sub start_postanswerdate {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  if ($target eq 'web' || $target eq 'grade') {
+    if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
+      &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_postanswerdate {
+  return '';
+}
+
+sub start_notsolved {
+  my ($target,$token,$parstack,$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",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_notsolved {
+  return '';
+}
+
+sub start_solved {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  if ($target eq 'web' || $target eq 'grade') {
+    my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
+    if ($gradestatus !~ /^correct/) {
+      &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_solved {
+  return '';
+}
+
+sub start_startouttext {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my @result=(''.'');
+  if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
+  return (@result);
+}
+sub end_startouttext {
+  my ($target,$token,$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,$token,$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,$token,$parstack,$parser,$safeeval)=@_;
+  my @result=('','');
+  if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
+  return (@result);
+}
+
+
 1;
 __END__
