--- rat/lonuserstate.pm	2000/08/23 13:02:58	1.5
+++ rat/lonuserstate.pm	2001/08/31 14:19:06	1.24
@@ -10,7 +10,10 @@
 # 7/1 Gerd Kortemeyer)
 # 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer)
 #
-# 7/15,7/17,7/18,8/1,8/2,8/4,8/5,8/21,8/22,8/23 Gerd Kortemeyer
+# 7/15,7/17,7/18,8/1,8/2,8/4,8/5,8/21,8/22,8/23,8/30,
+# 9/2,9/4,9/29,9/30,10/2,10/11,10/30,10/31,
+# 11/1,11/2,11/14,11/16,11/22,12/28,
+# 07/05/01,08/30,08/31 Gerd Kortemeyer
 
 package Apache::lonuserstate;
 
@@ -20,13 +23,19 @@ use Apache::File;
 use HTML::TokeParser;
 use Apache::lonnet();
 use GDBM_File;
+use Apache::lonmsg;
+use Safe;
+use Safe::Hole;
+use Opcode;
 
 # ---------------------------------------------------- Globals for this package
 
 my $pc;      # Package counter
 my %hash;    # The big tied hash
+my %parmhash;# The hash with the parameters
 my @cond;    # Array with all of the conditions
 my $errtext; # variable with all errors
+my $retfurl; # variable with the very first URL in the course
 
 # --------------------------------------------------------- Loads map from disk
 
@@ -41,13 +50,14 @@ sub loadmap {
 
     my $fn='/home/httpd/html'.$uri;
 
-    unless (($fn=~/\.course$/) ||
-            ($fn=~/\.sequence$/) ||
+    unless (($fn=~/\.sequence$/) ||
             ($fn=~/\.page$/)) { 
        $errtext.="Invalid map: $fn\n";
        return OK; 
     }
 
+    my $ispage=($fn=~/\.page$/);
+
     unless (-e $fn) {
 	my $returned=Apache::lonnet::repcopy($fn);
         unless ($returned eq OK) {
@@ -91,6 +101,18 @@ sub loadmap {
                     $hash{'kind_'.$rid}='res';
                     $hash{'title_'.$rid}=$token->[2]->{'title'};
                     my $turi=$token->[2]->{'src'};
+                    unless ($ispage) {
+                        $turi=~/\.(\w+)$/;
+                        my $embstyle=&Apache::lonnet::fileembstyle($1);
+                        if ($token->[2]->{'external'} eq 'true') {
+                            $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
+                        } else {
+                           my $embstyle=&Apache::lonnet::fileembstyle($1);
+                           if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
+			       $turi='/adm/wrapper'.$turi;
+                           }
+                        }
+		    }
                     $hash{'src_'.$rid}=$turi;
 
                     if (defined($hash{'ids_'.$turi})) {
@@ -99,7 +121,7 @@ sub loadmap {
                         $hash{'ids_'.$turi}=''.$rid;
                     }
 
-                    if ($token->[2]->{'src'}=~/\/\//) {
+                    if ($token->[2]->{'external'} eq 'true') {
                         $hash{'ext_'.$rid}='true:';
                     } else {
                         $hash{'ext_'.$rid}='false:';
@@ -116,8 +138,7 @@ sub loadmap {
                         $hash{'type_'.$rid}='normal';
                     }
 
-                    if (($turi=~/\.course$/) ||
-                        ($turi=~/\.sequence$/) ||
+                    if (($turi=~/\.sequence$/) ||
                         ($turi=~/\.page$/)) {
                         $hash{'is_map_'.$rid}=1;
                         &loadmap($turi);
@@ -165,6 +186,23 @@ sub loadmap {
                     } else {
                         $hash{'from_'.$goesto}=''.$linkid;
                     }
+                } elsif ($token->[1] eq 'param') {
+# ------------------------------------------------------------------- Parameter
+
+                    my $referid=$lpc.'.'.$token->[2]->{'to'};
+                    my $part=$token->[2]->{'part'};
+                    unless ($part) { $part=0; }
+                    my $newparam=
+			&Apache::lonnet::escape($token->[2]->{'type'}).':'.
+			&Apache::lonnet::escape($part.'.'.
+                         $token->[2]->{'name'}).'='.
+			&Apache::lonnet::escape($token->[2]->{'value'});
+                    if (defined($hash{'param_'.$referid})) {
+                        $hash{'param_'.$referid}.='&'.$newparam;
+                    } else {
+                        $hash{'param_'.$referid}=''.$newparam;
+                    }
+
                 } 
 
             }
@@ -179,16 +217,14 @@ sub loadmap {
 
 sub simplify {
    my $expression=shift;
-# "True and" is nothing 
-   $expression=~s/0\&//g;
 # (8)=8
    $expression=~s/\((\d+)\)/$1/g;
 # 8&8=8
-   $expression=~s/(\d+)\&\1/$1/g;
+   $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
 # 8|8=8
-   $expression=~s/(\d+)\|\1/$1/g;
+   $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
 # (5&3)&4=5&3&4
-   $expression=~s/\((\d+)\&(\d+)\)\&(\d+)/$1\&$2\&$3/g;
+   $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
 # (((5&3)|(4&6)))=((5&3)|(4&6))
    $expression=~
        s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
@@ -205,6 +241,9 @@ sub traceroute {
     $sofar=simplify($sofar);
     unless ($beenhere=~/\&$rid\&/) {
        $beenhere.=$rid.'&';  
+       if ($retfurl eq '') {
+           $retfurl=$hash{'src_'.$rid};
+       }
        if (defined($hash{'conditions_'.$rid})) {
 	   $hash{'conditions_'.$rid}=simplify(
            '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
@@ -238,7 +277,7 @@ sub traceroute {
     }
 }
 
-# ------------------------------------------ Cascading conditions, quick access
+# ------------------------------ Cascading conditions, quick access, parameters
 
 sub accinit {
     my ($uri,$short,$fn)=@_;
@@ -252,14 +291,14 @@ sub accinit {
           map {
              my $sub=$_;
              my $orig=$_;
-             $sub=~/\(\((\d+(:?\&\d+)*)(?:\&\d+)+\)(?:\|\(\1(?:\&\d+)+\))+\)/;
+      $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
              my $factor=$1;
-             $sub=~s/$factor\&//g;
-             $sub=~s/^\(/\($factor\&\(/;
+             $sub=~s/$factor//g;
+             $sub=~s/^\(/\($factor\(/;
 	     $sub.=')';
              $sub=simplify($sub);
              $orig=~s/(\W)/\\$1/g;
-	     $expr=~s/$orig/$sub/;
+ 	     $expr=~s/$orig/$sub/;
 	  } ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g);
           $hash{$_}=$expr;
           unless (defined($captured{$expr})) {
@@ -267,45 +306,87 @@ sub accinit {
               $captured{$expr}=$condcounter;
               $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
           } 
-        }
+       } elsif ($_=~/^param_(\d+)\.(\d+)/) {
+          my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
+      '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
+          map {
+	     my ($typename,$value)=split(/\=/,$_);
+             my ($type,$name)=split(/\:/,$typename);
+             $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
+                                   &Apache::lonnet::unescape($value);
+	     $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
+                                   &Apache::lonnet::unescape($type);
+          } split(/\&/,$hash{$_});
+       }
     } keys %hash;
     map {
 	if ($_=~/^ids/) {
-	    my $resid=$hash{$_};
+	  map {
+	    my $resid=$_;
             my $uri=$hash{'src_'.$resid};
+            $uri=~s/^\/adm\/wrapper//;
             my @uriparts=split(/\//,$uri);
             my $urifile=$uriparts[$#uriparts];
             $#uriparts--;
             my $uripath=join('/',@uriparts);
+            $uripath=~s/^\/res\///;
+           if ($uripath) {
+            my $uricond='0';
             if (defined($hash{'conditions_'.$resid})) {
- 		$urifile.=':'.$captured{$hash{'conditions_'.$resid}};
-            } else {
-                $urifile.=':0';
+ 		$uricond=$captured{$hash{'conditions_'.$resid}};
             }
             if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
-		$acchash{'acc.res.'.$short.'.'.$uripath}.=$urifile.'&';
+                if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
+                   /(\&$urifile\:[^\&]*)/) {
+		    my $replace=$1;
+                    $acchash{'acc.res.'.$short.'.'.$uripath}
+                     =~s/$replace/$replace\|$uricond/;
+                } else {
+		   $acchash{'acc.res.'.$short.'.'.$uripath}.=
+                     $urifile.':'.$uricond.'&';
+	        }
             } else {
-                $acchash{'acc.res.'.$short.'.'.$uripath}='&'.$urifile.'&';
+                $acchash{'acc.res.'.$short.'.'.$uripath}=
+                 '&'.$urifile.':'.$uricond.'&';
             }
-        }
+           } 
+         } split(/\,/,$hash{$_});
+      }
     } keys %hash;
+    $acchash{'acc.res.'.$short.'.'}='&:0&';
+    my $courseuri=$uri;
+    $courseuri=~s/^\/res\///;
+    &Apache::lonnet::delenv('(acc\.|httpref\.)');
     &Apache::lonnet::appenv(%acchash,
-                            "request.course"    => $short,
-                            "request.course.fn" => $fn); 
+                            "request.course.id"  => $short,
+                            "request.course.fn"  => $fn,
+                            "request.course.uri" => $courseuri); 
 }
 
 # ---------------------------------------------------- Read map and all submaps
 
-#
-# Call with uri of course map, short name for course, and filename for
-# binary structure
-#
-
 sub readmap {
-   my ($uri,$short,$fn)=@_;
+   my $short=shift;
+   $short=~s/^\///;
+   my %cenv=&Apache::lonnet::coursedescription($short);
+   my $fn=$cenv{'fn'};
+   my $uri;
+   $short=~s/\//\_/g;
+   unless ($uri=$cenv{'url'}) { 
+      &Apache::lonnet::logthis("<font color=blue>WARNING: ".
+                       "Could not load course $short.</font>"); 
+      return 'No course data available.';
+   }
    @cond=('true:normal');
-   if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) {
+   unlink($fn.'.db');
+   unlink($fn.'_symb.db');
+   unlink($fn.'.state');
+   unlink($fn.'parms.db');
+   $retfurl='';
+   if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) &&
+       (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT,0640))) {
     %hash=();
+    %parmhash=();
     $errtext='';
     $pc=0;
     loadmap($uri);
@@ -313,7 +394,7 @@ sub readmap {
         &traceroute('0',$hash{'map_start_'.$uri},'&');
         &accinit($uri,$short,$fn);
     }
-    unless (untie(%hash)) {
+    unless ((untie(%hash)) && (untie(%parmhash))) {
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                        "Could not untie coursemap $fn for $uri.</font>"); 
     }
@@ -322,17 +403,59 @@ sub readmap {
      if ($cfh=Apache::File->new(">$fn.state")) {
         print $cfh join("\n",@cond);
      } else {
-      &Apache::lonnet::logthis("<font color=blie>WARNING: ".
+      &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                        "Could not write statemap $fn for $uri.</font>"); 
      }
     }  
    } else {
-      &Apache::lonnet::logthis("<font color=blie>WARNING: ".
+      &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                        "Could not tie coursemap $fn for $uri.</font>"); 
    }
-   return $errtext;
+   &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
+   return ($retfurl,$errtext);
+}
+
+# ------------------------------------------------------- Evaluate state string
+
+sub evalstate {
+
+    my $fn=$ENV{'request.course.fn'}.'.state';
+    my $state='2';
+    if (-e $fn) {
+       my @conditions=();
+       {
+        my $fh=Apache::File->new($fn);
+        @conditions=<$fh>;
+       }  
+       my $safeeval = new Safe;
+       my $safehole = new Safe::Hole;
+       $safeeval->permit("entereval");
+       $safeeval->permit(":base_math");
+       $safeeval->deny(":base_io");
+       $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
+       map {
+	   my $line=$_;
+           chomp($line);
+	   my ($condition,$weight)=split(/\:/,$_);
+           if ($safeeval->reval($condition)) {
+	       if ($weight eq 'force') {
+		   $state.='3';
+               } else {
+                   $state.='2';
+               }
+           } else {
+               if ($weight eq 'stop') {
+		   $state.='0';
+               } else {
+                   $state.='1';
+               }
+           }
+       } @conditions;
+    }
+    &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
+    return $state;
 }
- 
+
 1;
 __END__