--- loncom/homework/structuretags.pm	2000/09/14 15:41:32	1.6
+++ loncom/homework/structuretags.pm	2001/02/19 21:02:59	1.33
@@ -1,12 +1,109 @@
 # The LearningOnline Network with CAPA # <script> definiton
-
+# 2/19 Guy
 package Apache::structuretags; 
 
 use strict;
 use Apache::lonnet;
 
 sub BEGIN {
-  &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist'));
+  &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','web','tex','part','preduedate','postanswerdate','solved','notsolved'));
+}
+
+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 $datemsg;
+  if ($target ne 'meta') {
+    ($status,$datemsg) = &Apache::lonhomework::check_date('0');
+    push (@Apache::inputtags::status,$status);
+    my $expression='$external::datestatus="'.$status.'";';
+    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
+    &Apache::run::run($expression,$safeeval);
+    if ( $status eq 'CLOSED' ) {
+      my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
+      if ( $target eq "web" ) {
+	return "<body bgcolor=\"#FFFFFF\"> <br />Problem is not open to be viewed. The problem $datemsg<br />";
+      }
+    } 
+  }
+  if ($target eq 'web') {
+    my $args ='';
+    if ( $#$parstack > -1 ) { $args=$$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 ($status eq 'CAN_ANSWER') {
+      # create a page header and exit
+      return "<title>$name</title>\n<body bgcolor=\"#FFFFFF\">\n<form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".'<input type="hidden" name="submitted" value="yes" />';
+    } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' || $status eq 'CLOSED') {
+      return "<title>$name</title>\n<body bgcolor=\"#FFFFFF\">\n";
+    }
+  }
+  return '';
+}
+
+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' &&
+       $status eq 'CAN_ANSWER') {
+      # if part is zero, no <part>s existed, so we need to the grading
+      &Apache::inputtags::grade;
+    } elsif ($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') {
+	$result.="</body>\n"; 
+      } 
+    }
+  } else {
+    if ($Apache::inputtags::part eq '0') {
+      $result=&Apache::response::mandatory_part_meta;
+    }
+  }
+  return $result;
 }
 
 sub start_block {
@@ -15,12 +112,12 @@ 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 "";
 }
@@ -40,8 +137,7 @@ sub start_while {
   my $bodytext=$$parser[$#$parser]->get_text("/while");
   push( @Apache::structuretags::whilebody, $bodytext);
   if ( $result ) { 
-     my $tempparser=HTML::TokeParser->new(\$bodytext);
-     push (@$parser,$tempparser);
+    &Apache::lonxml::newparser($parser,\$bodytext);
   }
   return "";
 }
@@ -52,8 +148,7 @@ sub end_while {
   my $bodytext = pop @Apache::structuretags::whilebody;
   my $result = &Apache::run::run($code,$safeeval);
   if ( $result ) { 
-     my $tempparser=HTML::TokeParser->new(\$bodytext);
-     push (@$parser,$tempparser);
+    &Apache::lonxml::newparser($parser,\$bodytext);
   } 
   return "";
 }
@@ -66,48 +161,150 @@ sub end_while {
 # </randomlist>
 sub start_randomlist {
   my ($target,$token,$parstack,$parser,$safeeval)=@_;
-  my $body= &Apache::lonxml::get_all_text("randomlist",$$parser[$#$parser]);
+  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;
-  my $param;
 
   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);
-      $param='';
-      map {$param .= "$_=\"$b_tok->[2]->{$_}\" "} @{$b_tok->[3]};
-      $param=~ s/^\s*(\S+)\s*$/$1/;
-      $param= " $param" if $param ne "";
-      $list_item = "<$b_tok->[1]"."$param>"."$list_item"."</$b_tok->[1]>";
-      print "<B>START-TAG $b_tok->[1], $list_item</B><BR>";
+      $list_item = &Apache::lonxml::get_all_text('/'.$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>";
+      #  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>";
+      #  print "<b>END-TAG $b_tok->[1]</b><br />";
     # }
   }
-  # randomly select one item from the array @randomlist 
-  # and created a new parser for it and push it onto the
-  # parser stack
-  my $bodytext = $randomlist[int(rand($#randomlist - 1)) + 1];
-  my $tempparser=HTML::TokeParser->new(\$bodytext);
-  print "SELECT-BODY<B>$bodytext</B><BR>";
-  push (@$parser,$tempparser);
+  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=$$parstack[$#$parstack]; }
+  my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
+  $Apache::inputtags::part=$id;
+  @Apache::inputtags::responselist = ();
+  if ($target eq 'meta') {
+    return &Apache::response::mandatory_part_meta;
+  } else {
+    my ($status,$datemsg) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
+    push (@Apache::inputtags::status,$status);
+    my $expression='$external::datestatus="'.$status.'";';
+    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
+    &Apache::run::run($expression,$safeeval);
+    if ( $status eq 'CLOSED' ) {
+      my $bodytext=&Apache::lonxml::get_all_text("/part",$$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' && $status eq 'CAN_ANSWER') { 
+    return &Apache::inputtags::grade; 
+  }
+  return &Apache::inputtags::gradestatus($Apache::inputtags::part);
+}
+
+sub start_preduedate {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  if ($target ne 'meta') {
+    if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
+	$Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
+      &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_preduedate {
+  return '';
+}
+
+sub start_postanswerdate {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  if ($target ne 'meta') {
+    if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
+      &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_postanswerdate {
+  return '';
+}
+
+sub start_notsolved {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  if ($target 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("/notsolved",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_notsolved {
+  return '';
+}
+
+sub start_solved {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  if ($target ne 'meta') {
+    my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
+    if ($gradestatus !~ /^correct/) {
+      &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
+    }
+  }
+  return '';
+}
+
+sub end_solved {
+  return '';
+}
 1;
 __END__
