--- rat/lonuserstate.pm 2000/07/18 17:32:32 1.1
+++ rat/lonuserstate.pm 2002/06/17 16:40:24 1.28
@@ -1,32 +1,72 @@
# The LearningOnline Network with CAPA
# Construct and maintain state and binary representation of course for user
#
+# $Id: lonuserstate.pm,v 1.28 2002/06/17 16:40:24 www Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
+#
# (Server for RAT Maps
#
# (Edit Handler for RAT Maps
# (TeX Content Handler
#
+# YEAR=2000
# 05/29/00,05/30 Gerd Kortemeyer)
# 7/1 Gerd Kortemeyer)
# 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer)
#
-# 7/15,7/17,7/18 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,
+# YEAR=2001
+# 07/05/01,08/30,08/31 Gerd Kortemeyer
+# 12/16 Scott Harrison
+#
+###
package Apache::lonuserstate;
+# ------------------------------------------------- modules used by this module
use strict;
use Apache::Constants qw(:common :http);
use Apache::File;
use HTML::TokeParser;
use Apache::lonnet();
+use Apache::loncommon();
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 +81,14 @@ 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 +132,18 @@ sub loadmap {
$hash{'kind_'.$rid}='res';
$hash{'title_'.$rid}=$token->[2]->{'title'};
my $turi=$token->[2]->{'src'};
+ unless ($ispage) {
+ $turi=~/\.(\w+)$/;
+ my $embstyle=&Apache::loncommon::fileembstyle($1);
+ if ($token->[2]->{'external'} eq 'true') {
+ $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
+ } else {
+ my $embstyle=&Apache::loncommon::fileembstyle($1);
+ if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
+ $turi='/adm/wrapper'.$turi;
+ }
+ }
+ }
$hash{'src_'.$rid}=$turi;
if (defined($hash{'ids_'.$turi})) {
@@ -99,20 +152,26 @@ 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:';
}
if ($token->[2]->{'type'}) {
$hash{'type_'.$rid}=$token->[2]->{'type'};
+ if ($token->[2]->{'type'} eq 'start') {
+ $hash{'map_start_'.$uri}="$rid";
+ }
+ if ($token->[2]->{'type'} eq 'finish') {
+ $hash{'map_finish_'.$uri}="$rid";
+ }
} else {
$hash{'type_'.$rid}='normal';
}
- if (($turi=~/\.course$/) ||
- ($turi=~/\.sequence$/) ||
+ if (($turi=~/\.sequence$/) ||
($turi=~/\.page$/)) {
+ $hash{'is_map_'.$rid}=1;
&loadmap($turi);
}
@@ -122,11 +181,12 @@ sub loadmap {
my $rid=$lpc.'.'.$token->[2]->{'id'};
$hash{'kind_'.$rid}='cond';
- $hash{'value_'.$rid}=$token->[2]->{'value'};
+ $cond[$#cond+1]=$token->[2]->{'value'};
+ $hash{'condid_'.$rid}=$#cond;
if ($token->[2]->{'type'}) {
- $hash{'type_'.$rid}=$token->[2]->{'type'};
+ $cond[$#cond].=':'.$token->[2]->{'type'};
} else {
- $hash{'type_'.$rid}='normal';
+ $cond[$#cond].=':normal';
}
} elsif ($token->[1] eq 'link') {
@@ -157,6 +217,25 @@ 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}=''.$newparam;
+ }
+ if ($token->[2]->{'name'} eq 'mapalias') {
+ $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
+ }
}
}
@@ -167,41 +246,305 @@ sub loadmap {
}
}
+# --------------------------------------------------------- Simplify expression
+
+sub simplify {
+ my $expression=shift;
+# (8)=8
+ $expression=~s/\((\d+)\)/$1/g;
+# 8&8=8
+ $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
+# 8|8=8
+ $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
+# (5&3)&4=5&3&4
+ $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;
+# ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
+ $expression=~
+ s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
+ return $expression;
+}
+
+# -------------------------------------------------------- Build condition hash
+
+sub traceroute {
+ my ($sofar,$rid,$beenhere)=@_;
+ $sofar=simplify($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.')');
+ } else {
+ $hash{'conditions_'.$rid}=$sofar;
+ }
+ if (defined($hash{'is_map_'.$rid})) {
+ if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
+ &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
+ if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
+ $sofar=
+ $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
+ }
+ }
+ }
+ if (defined($hash{'to_'.$rid})) {
+ foreach (split(/\,/,$hash{'to_'.$rid})) {
+ my $further=$sofar;
+ if ($hash{'undercond_'.$_}) {
+ if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
+ $further=simplify('('.$further.')&('.
+ $hash{'condid_'.$hash{'undercond_'.$_}}.')');
+ } else {
+ $errtext.='Undefined condition ID: '
+ .$hash{'undercond_'.$_}.'. ';
+ }
+ }
+ &traceroute($further,$hash{'goesto_'.$_},$beenhere);
+ }
+ }
+ }
+}
+
+# ------------------------------ Cascading conditions, quick access, parameters
+
+sub accinit {
+ my ($uri,$short,$fn)=@_;
+ my %acchash=();
+ my %captured=();
+ my $condcounter=0;
+ $acchash{'acc.cond.'.$short.'.0'}=0;
+ foreach (keys %hash) {
+ if ($_=~/^conditions/) {
+ my $expr=$hash{$_};
+ foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
+ my $sub=$_;
+ my $orig=$_;
+ $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
+ my $factor=$1;
+ $sub=~s/$factor//g;
+ $sub=~s/^\(/\($factor\(/;
+ $sub.=')';
+ $sub=simplify($sub);
+ $orig=~s/(\W)/\\$1/g;
+ $expr=~s/$orig/$sub/;
+ }
+ $hash{$_}=$expr;
+ unless (defined($captured{$expr})) {
+ $condcounter++;
+ $captured{$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.'.'.$2});
+ foreach (split(/\&/,$hash{$_})) {
+ my ($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);
+ }
+ }
+ }
+ foreach (keys %hash) {
+ if ($_=~/^ids/) {
+ foreach (split(/\,/,$hash{$_})) {
+ 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})) {
+ $uricond=$captured{$hash{'conditions_'.$resid}};
+ }
+ if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
+ if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
+ /(\&$urifile\:[^\&]*)/) {
+ my $replace=$1;
+ my $regexp=$replace;
+ $regexp=~s/\|/\\\|/g;
+ $acchash{'acc.res.'.$short.'.'.$uripath}
+ =~s/$regexp/$replace\|$uricond/;
+ } else {
+ $acchash{'acc.res.'.$short.'.'.$uripath}.=
+ $urifile.':'.$uricond.'&';
+ }
+ } else {
+ $acchash{'acc.res.'.$short.'.'.$uripath}=
+ '&'.$urifile.':'.$uricond.'&';
+ }
+ }
+ }
+ }
+ }
+ $acchash{'acc.res.'.$short.'.'}='&:0&';
+ my $courseuri=$uri;
+ $courseuri=~s/^\/res\///;
+ &Apache::lonnet::delenv('(acc\.|httpref\.)');
+ &Apache::lonnet::appenv(%acchash,
+ "request.course.id" => $short,
+ "request.course.fn" => $fn,
+ "request.course.uri" => $courseuri);
+}
# ---------------------------------------------------- Read map and all submaps
sub readmap {
- my $uri=shift;
- @cond=();
- %hash=();
- $errtext='';
- $pc=0;
- loadmap($uri);
-}
-
-sub handler {
- my $r = shift;
- $r->content_type('text/html');
- $r->send_http_header;
- return OK if $r->header_only;
- readmap('/res/msu/korte/foo.course');
- $r->print("\n");
- my $hashkey;
- foreach $hashkey (keys %hash) {
- $r->print("$hashkey: $hash{$hashkey}
\n");
+ 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("WARNING: ".
+ "Could not load course $short.");
+ return 'No course data available.';
+ }
+ @cond=('true:normal');
+ unlink($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);
+ if (defined($hash{'map_start_'.$uri})) {
+ &traceroute('0',$hash{'map_start_'.$uri},'&');
+ &accinit($uri,$short,$fn);
+ }
+ unless ((untie(%hash)) && (untie(%parmhash))) {
+ &Apache::lonnet::logthis("WARNING: ".
+ "Could not untie coursemap $fn for $uri.");
+ }
+ {
+ my $cfh;
+ if ($cfh=Apache::File->new(">$fn.state")) {
+ print $cfh join("\n",@cond);
+ } else {
+ &Apache::lonnet::logthis("WARNING: ".
+ "Could not write statemap $fn for $uri.");
+ }
+ }
+ } else {
+ &Apache::lonnet::logthis("WARNING: ".
+ "Could not tie coursemap $fn for $uri.");
+ }
+ &Apache::lonmsg::author_res_msg($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');
+ foreach (@conditions) {
+ 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';
+ }
+ }
+ }
}
- $r->print("$errtext
\n");
- return OK;
+ &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
+ return $state;
}
-
-
1;
__END__
+=head1 NAME
+
+Apache::lonuserstate - Construct and maintain state and binary representation
+of course for user
+
+=head1 SYNOPSIS
+
+Invoked by lonroles.pm.
+
+&Apache::lonuserstate::readmap($cdom.'/'.$cnum);
+
+=head1 INTRODUCTION
+
+This module constructs and maintains state and binary representation
+of course for user.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 HANDLER SUBROUTINE
+
+There is no handler subroutine.
+
+=head1 OTHER SUBROUTINES
+
+=over 4
+
+=item *
+
+loadmap() : Loads map from disk
+
+=item *
+
+simplify() : Simplify expression
+
+=item *
+
+traceroute() : Build condition hash
+
+=item *
+
+accinit() : Cascading conditions, quick access, parameters
+=item *
+readmap() : Read map and all submaps
+=item *
+evalstate() : Evaluate state string
+=back
+=cut