# The LearningOnline Network with CAPA # Construct and maintain state and binary representation of course for user # # $Id: lonuserstate.pm,v 1.149.2.2 2019/02/07 01:51:34 raeburn 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/ # ### package Apache::lonuserstate; # ------------------------------------------------- modules used by this module use strict; use HTML::TokeParser; use Apache::lonnet; use Apache::lonlocal; use Apache::loncommon(); use GDBM_File; use Apache::lonmsg; use Safe; use Safe::Hole; use Opcode; use Apache::lonenc; use Fcntl qw(:flock); use LONCAPA; use File::Basename; # ---------------------------------------------------- Globals for this package my $pc; # Package counter is this what 'Guts' calls the map 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 $retfrid; # variable with the very first RID in the course my $retfurl; # first URL my %randompick; # randomly picked resources my %randompickseed; # optional seed for randomly picking resources my %randomorder; # maps to order contents randomly my %randomizationcode; # code used to grade folder for bubblesheet exam my %encurl; # URLs in this folder are supposed to be encrypted my %hiddenurl; # this URL (or complete folder) is supposed to be hidden my %rescount; # count of unhidden items in each map my %mapcount; # count of unhidden maps in each map # ----------------------------------- Remove version from URL and store in hash sub versionerror { my ($uri,$usedversion,$unusedversion)=@_; return '
'.&mt('Version discrepancy: resource [_1] included in both version [_2] and version [_3]. Using version [_2].', $uri,$usedversion,$unusedversion).'
'; } # Removes the version number from a URI and returns the resulting # URI (e.g. mumbly.version.stuff => mumbly.stuff). # # If the URI has not been seen with a versio before the # hash{'version_'.resultingURI} is set to the version number. # If the URI has been seen and the version does not match and error # is added to the error string. # # Parameters: # URI potentially with a version. # Returns: # URI with the version cut out. # See above for side effects. # sub versiontrack { my $uri=shift; if ($uri=~/\.(\d+)\.\w+$/) { my $version=$1; $uri=~s/\.\d+\.(\w+)$/\.$1/; unless ($hash{'version_'.$uri}) { $hash{'version_'.$uri}=$version; } elsif ($version!=$hash{'version_'.$uri}) { $errtext.=&versionerror($uri,$hash{'version_'.$uri},$version); } } return $uri; } # -------------------------------------------------------------- Put in version sub putinversion { my $uri=shift; my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri); if ($hash{'version_'.$uri}) { my $version=$hash{'version_'.$uri}; if ($version eq 'mostrecent') { return $uri; } if ($version eq &Apache::lonnet::getversion( &Apache::lonnet::filelocation('',$uri))) { return $uri; } $uri=~s/\.(\w+)$/\.$version\.$1/; } &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600); return $uri; } # ----------------------------------------- Processing versions file for course sub processversionfile { my %cenv=@_; my %versions=&Apache::lonnet::dump('resourceversions', $cenv{'domain'}, $cenv{'num'}); foreach my $ver (keys(%versions)) { if ($ver=~/^error\:/) { return; } $hash{'version_'.$ver}=$versions{$ver}; } } # --------------------------------------------------------- Loads from disk # # Loads a map file. # Note that this may implicitly recurse via parse_resource if one of the resources # is itself composed. # # Parameters: # uri - URI of the map file. # parent_rid - Resource id in the map of the parent resource (0.0 for the top level map) # courseid - Course id for the course for which the map is being loaded # sub loadmap { my ($uri,$parent_rid,$courseid)=@_; # Is the map already included? if ($hash{'map_pc_'.$uri}) { $errtext.='

'. &mt('Multiple use of sequence/page [_1]! The course will not function properly.',''.$uri.''). '

'; return; } # Register the resource in it's map_pc_ [for the URL] # map_id.nnn is the nesting level -> to the URI. $pc++; my $lpc=$pc; $hash{'map_pc_'.$uri}=$lpc; $hash{'map_id_'.$lpc}=$uri; # If the parent is of the form n.m hang this map underneath it in the # map hierarchy. if ($parent_rid =~ /^(\d+)\.\d+$/) { my $parent_pc = $1; if (defined($hash{'map_hierarchy_'.$parent_pc})) { $hash{'map_hierarchy_'.$lpc}=$hash{'map_hierarchy_'.$parent_pc}.','. $parent_pc; } else { $hash{'map_hierarchy_'.$lpc}=$parent_pc; } } # Determine and check filename of the sequence we need to read: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri)); my $ispage=($fn=~/\.page$/); # We can only nest sequences or pages. Anything else is an illegal nest. unless (($fn=~/\.sequence$/) || $ispage) { $errtext.='
'.&mt('Invalid map: [_1]',"$fn"); return; } # Read the XML that constitutes the file. my $instr=&Apache::lonnet::getfile($fn); if ($instr eq -1) { $errtext.= '
' .&mt('Map not loaded: The file [_1] does not exist.', "$fn"); return; } # Successfully got file, parse it # parse for parameter processing. # Note that these are tags # so we only care about 'S' (tag start) nodes. my $parser = HTML::TokeParser->new(\$instr); $parser->attr_encoded(1); # first get all parameters while (my $token = $parser->get_token) { next if ($token->[0] ne 'S'); if ($token->[1] eq 'param') { &parse_param($token,$lpc); } } # Get set to take another pass through the XML: # for resources and links. $parser = HTML::TokeParser->new(\$instr); $parser->attr_encoded(1); my $linkpc=0; $fn=~/\.(\w+)$/; $hash{'map_type_'.$lpc}=$1; my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i); # Parse the resources, link and condition tags. # Note that if randomorder or random select is chosen the links and # conditions are meaningless but are determined by the randomization. # This is handled in the next chunk of code. my @map_ids; my $codechecked; $rescount{$lpc} = 0; $mapcount{$lpc} = 0; while (my $token = $parser->get_token) { next if ($token->[0] ne 'S'); # Resource if ($token->[1] eq 'resource') { my $resource_id = &parse_resource($token,$lpc,$ispage,$uri,$courseid); if (defined $resource_id) { push(@map_ids, $resource_id); if ($hash{'src_'.$lpc.'.'.$resource_id}) { $rescount{$lpc} ++; if (($hash{'src_'.$lpc.'.'.$resource_id}=~/\.sequence$/) || ($hash{'src_'.$lpc.'.'.$resource_id}=~/\.page$/)) { $mapcount{$lpc} ++; } } unless ($codechecked) { my $startsymb = &Apache::lonnet::encode_symb($hash{'map_id_'.$lpc},$resource_id, $hash{'src_'."$lpc.$resource_id"}); my $code = &Apache::lonnet::EXT('resource.0.examcode',$startsymb,undef,undef, undef,undef,$courseid); if ($code) { $randomizationcode{$parent_rid} = $code; } $codechecked = 1; } } # Link } elsif ($token->[1] eq 'link' && !$randomize) { &make_link(++$linkpc,$lpc,$token->[2]->{'to'}, $token->[2]->{'from'}, $token->[2]->{'condition'}); # note ..condition may be undefined. # condition } elsif ($token->[1] eq 'condition' && !$randomize) { &parse_condition($token,$lpc); } } undef($codechecked); # Handle randomization and random selection if ($randomize) { my $advanced; if ($env{'request.course.id'}) { $advanced = (&Apache::lonnet::allowed('adv') eq 'F'); } else { $env{'request.course.id'} = $courseid; $advanced = (&Apache::lonnet::allowed('adv') eq 'F'); $env{'request.course.id'} = ''; } unless ($advanced) { # Order of resources is not randomized if user has and advanced role in the course. my $seed; # If the map's random seed parameter has been specified # it is used as the basis for computing the seed ... if (defined($randompickseed{$parent_rid})) { $seed = $randompickseed{$parent_rid}; } else { # Otherwise the parent's fully encoded symb is used. my ($mapid,$resid)=split(/\./,$parent_rid); my $symb= &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, $resid,$hash{'src_'.$parent_rid}); $seed = $symb; } # TODO: Here for sure we need to pass along the username/domain # so that we can impersonate users in lonprintout e.g. my $setcode; if (defined($randomizationcode{$parent_rid})) { if ($env{'form.CODE'} eq '') { $env{'form.CODE'} = $randomizationcode{$parent_rid}; $setcode = 1; } } my $rndseed=&Apache::lonnet::rndseed($seed); &Apache::lonnet::setup_random_from_rndseed($rndseed); if ($setcode) { undef($env{'form.CODE'}); undef($setcode); } # Take the set of map ids we have decoded and permute them to a # random order based on the seed set above. All of this is # processing the randomorder parameter if it is set, not # randompick. @map_ids=&Math::Random::random_permutation(@map_ids); } my $from = shift(@map_ids); my $from_rid = $lpc.'.'.$from; $hash{'map_start_'.$uri} = $from_rid; $hash{'type_'.$from_rid}='start'; # Create links to reflect the random re-ordering done above. # In the code to process the map XML, we did not process links or conditions # if randomorder was set. This means that for an instructor to choose while (my $to = shift(@map_ids)) { &make_link(++$linkpc,$lpc,$to,$from); my $to_rid = $lpc.'.'.$to; $hash{'type_'.$to_rid}='normal'; $from = $to; $from_rid = $to_rid; } $hash{'map_finish_'.$uri}= $from_rid; $hash{'type_'.$from_rid}='finish'; } $parser = HTML::TokeParser->new(\$instr); $parser->attr_encoded(1); # last parse out the mapalias params. These provide mnemonic # tags to resources that can be used in conditions while (my $token = $parser->get_token) { next if ($token->[0] ne 'S'); if ($token->[1] eq 'param') { &parse_mapalias_param($token,$lpc); } } } # -------------------------------------------------------------------- Resource # # Parses a resource tag to produce the value to push into the # map_ids array. # # # Information about the actual type of resource is provided by the file extension # of the uri (e.g. .problem, .sequence etc. etc.). # # Parameters: # $token - A token from HTML::TokeParser # This is an array that describes the most recently parsed HTML item. # $lpc - Map nesting level (?) # $ispage - True if this resource is encapsulated in a .page (assembled resourcde). # $uri - URI of the enclosing resource. # $courseid - Course id of the course containing the resource being parsed. # Returns: # Value of the id attribute of the tag. # # Note: # The token is an array that contains the following elements: # [0] => 'S' indicating this is a start token # [1] => 'resource' indicating this tag is a tag. # [2] => Hash of attribute =>value pairs. # [3] => @(keys [2]). # [4] => unused. # # The attributes of the resourcde tag include: # # id - The resource id. # src - The URI of the resource. # type - The resource type (e.g. start and finish). # title - The resource title. sub parse_resource { my ($token,$lpc,$ispage,$uri,$courseid) = @_; # I refuse to countenance code like this that has # such a dirty side effect (and forcing this sub to be called within a loop). # # if ($token->[2]->{'type'} eq 'zombie') { next; } # # The original code both returns _and_ skips to the next pass of the >caller's< # loop, that's just dirty. # # Zombie resources don't produce anything useful. if ($token->[2]->{'type'} eq 'zombie') { return undef; } my $rid=$lpc.'.'.$token->[2]->{'id'}; # Resource id in hash is levelcounter.id-in-xml. # Save the hash element type and title: $hash{'kind_'.$rid}='res'; $hash{'title_'.$rid}=$token->[2]->{'title'}; # Get the version free URI for the resource. # If a 'version' attribute was supplied, and this resource's version # information has not yet been stored, store it. # my $turi=&versiontrack($token->[2]->{'src'}); if ($token->[2]->{'version'}) { unless ($hash{'version_'.$turi}) { $hash{'version_'.$turi}=$1; } } # Pull out the title and do entity substitution on &colon # Q: Why no other entity substitutions? my $title=$token->[2]->{'title'}; $title=~s/\&colon\;/\:/gs; # I think the point of all this code is to construct a final # URI that apache and its rewrite rules can use to # fetch the resource. Thi s sonly necessary if the resource # is not a page. If the resource is a page then it must be # assembled (at fetch time?). unless ($ispage) { $turi=~/\.(\w+)$/; my $embstyle=&Apache::loncommon::fileembstyle($1); if ($token->[2]->{'external'} eq 'true') { # external $turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//; } elsif ($turi=~/^\/*uploaded\//) { # uploaded if (($embstyle eq 'img') || ($embstyle eq 'emb') || ($embstyle eq 'wrp')) { $turi='/adm/wrapper'.$turi; } elsif ($embstyle eq 'ssi') { #do nothing with these } elsif ($turi!~/\.(sequence|page)$/) { $turi='/adm/coursedocs/showdoc'.$turi; } } elsif ($turi=~/\S/) { # normal non-empty internal resource my $mapdir=$uri; $mapdir=~s/[^\/]+$//; $turi=&Apache::lonnet::hreflocation($mapdir,$turi); if (($embstyle eq 'img') || ($embstyle eq 'emb') || ($embstyle eq 'wrp')) { $turi='/adm/wrapper'.$turi; } } } # Store reverse lookup, remove query string resource 'ids'_uri => resource id. # If the URI appears more than one time in the sequence, it's resourcde # id's are constructed as a comma spearated list. my $idsuri=$turi; $idsuri=~s/\?.+$//; if (defined($hash{'ids_'.$idsuri})) { $hash{'ids_'.$idsuri}.=','.$rid; } else { $hash{'ids_'.$idsuri}=''.$rid; } if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard|viewclasslist)$/) { $turi.='?register=1'; } # resource id lookup: 'src'_resourc-di => URI decorated with a query # parameter as above if necessary due to the resource type. $hash{'src_'.$rid}=$turi; # Mark the external-ness of the resource: if ($token->[2]->{'external'} eq 'true') { $hash{'ext_'.$rid}='true:'; } else { $hash{'ext_'.$rid}='false:'; } # If the resource is a start/finish resource set those # entries in the has so that navigation knows where everything starts. # TODO? If there is a malformed sequence that has no start or no finish # resource, should this be detected and errors thrown? How would such a # resource come into being other than being manually constructed by a person # and then uploaded? Could that happen if an author decided a sequence was almost # right edited it by hand and then reuploaded it to 'fix it' but accidently cut the # start or finish resources? # # All resourcess also get a type_id => (start | finish | normal) hash entr. # 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'; } # Sequences end pages are constructed entities. They require that the # map that defines _them_ be loaded as well into the hash...with this resourcde # as the base of the nesting. # Resources like that are also marked with is_map_id => 1 entries. # if (($turi=~/\.sequence$/) || ($turi=~/\.page$/)) { $hash{'is_map_'.$rid}=1; &loadmap($turi,$rid,$courseid); } return $token->[2]->{'id'}; } #-------------------------------------------------------------------- link # Links define how you are allowed to move from one resource to another. # They are the transition edges in the directed graph that a map is. # This sub takes informatino from a tag and constructs the # navigation bits and pieces of a map. There is no requirement that the # resources that are linke are already defined, however clearly the map is # badly broken if they are not _eventually_ defined. # # Note that links can be unconditional or conditional. # # Parameters: # linkpc - The link counter for this level of map nesting (this is # reset to zero by loadmap prior to starting to process # links for map). # lpc - The map level ocounter (how deeply nested this map is in # the hierarchy of maps that are recursively read in. # to - resource id (within the XML) of the target of the edge. # from - resource id (within the XML) of the source of the edge. # condition- id of condition associated with the edge (also within the XML). # sub make_link { my ($linkpc,$lpc,$to,$from,$condition) = @_; # Compute fully qualified ids for the link, the # and from/to by prepending lpc. # my $linkid=$lpc.'.'.$linkpc; my $goesto=$lpc.'.'.$to; my $comesfrom=$lpc.'.'.$from; my $undercond=0; # If there is a condition, qualify it with the level counter. if ($condition) { $undercond=$lpc.'.'.$condition; } # Links are represnted by: # goesto_.fuullyqualifedlinkid => fully qualified to # comesfrom.fullyqualifiedlinkid => fully qualified from # undercond_.fullyqualifiedlinkid => fully qualified condition id. $hash{'goesto_'.$linkid}=$goesto; $hash{'comesfrom_'.$linkid}=$comesfrom; $hash{'undercond_'.$linkid}=$undercond; # In addition: # to_.fully qualified from => comma separated list of # link ids with that from. # Similarly: # from_.fully qualified to => comma separated list of link ids` # with that to. # That allows us given a resource id to know all edges that go to it # and leave from it. # if (defined($hash{'to_'.$comesfrom})) { $hash{'to_'.$comesfrom}.=','.$linkid; } else { $hash{'to_'.$comesfrom}=''.$linkid; } if (defined($hash{'from_'.$goesto})) { $hash{'from_'.$goesto}.=','.$linkid; } else { $hash{'from_'.$goesto}=''.$linkid; } } # ------------------------------------------------------------------- Condition # # Processes tags, storing sufficient information about them # in the hash so that they can be evaluated and used to conditionalize # what is presented to the student. # # these can have the following attributes # # id = A unique identifier of the condition within the map. # # value = Is a perl script-let that, when evaluated in safe space # determines whether or not the condition is true. # Normally this takes the form of a test on an Apache::lonnet::EXT call # to find the value of variable associated with a resource in the # map identified by a mapalias. # Here's a fragment of XML code that illustrates this: # # # # # # # # In this fragment: # - The param tag establishes an alias to resource id 5 of 'mainproblem'. # - The resource that is the start of the map is identified. # - The resource tag identifies the resource associated with this tag # and gives it the id 5. # - The condition is true if the tries variable associated with mainproblem # is less than 2 (that is the user has had more than 2 tries). # The condition type is a stop condition which inhibits(?) the associated # link if the condition is false. # - The link to resource 5 from resource 1 is affected by this condition. # # type = Type of the condition. The type determines how the condition affects the # link associated with it and is one of # - 'force' # - 'stop' # anything else including not supplied..which treated as: # - 'normal'. # Presumably maps get created by the resource assembly tool and therefore # illegal type values won't squirm their way into the XML. # # Side effects: # - The kind_level-qualified-condition-id hash element is set to 'cond'. # - The condition text is pushed into the cond array and its element number is # set in the condid_level-qualified-condition-id element of the hash. # - The condition type is colon appneded to the cond array element for this condition. sub parse_condition { my ($token,$lpc) = @_; my $rid=$lpc.'.'.$token->[2]->{'id'}; $hash{'kind_'.$rid}='cond'; my $condition = $token->[2]->{'value'}; $condition =~ s/[\n\r]+/ /gs; push(@cond, $condition); $hash{'condid_'.$rid}=$#cond; if ($token->[2]->{'type'}) { $cond[$#cond].=':'.$token->[2]->{'type'}; } else { $cond[$#cond].=':normal'; } } # ------------------------------------------------------------------- Parameter # Parse a tag in the map. # Parmameters: # $token Token array for a start tag from HTML::TokeParser # [0] = 'S' # [1] = tagname ("param") # [2] = Hash of {attribute} = values. # [3] = Array of the keys in [2]. # [4] = unused. # $lpc Current map nesting level.a # # Typical attributes: # to=n - Number of the resource the parameter applies to. # type=xx - Type of parameter value (e.g. string_yesno or int_pos). # name=xxx - Name of parameter (e.g. parameter_randompick or parameter_randomorder). # value=xxx - value of the parameter. sub parse_param { my ($token,$lpc) = @_; my $referid=$lpc.'.'.$token->[2]->{'to'}; # Resource param applies to. my $name=$token->[2]->{'name'}; # Name of parameter my $part; if ($name=~/^parameter_(.*)_/) { $part=$1; } else { $part=0; } # Peel the parameter_ off the parameter name. $name=~s/^.*_([^_]*)$/$1/; # The value is: # type.part.name.value my $newparam= &escape($token->[2]->{'type'}).':'. &escape($part.'.'.$name).'='. &escape($token->[2]->{'value'}); # The hash key is param_resourceid. # Multiple parameters for a single resource are & separated in the hash. if (defined($hash{'param_'.$referid})) { $hash{'param_'.$referid}.='&'.$newparam; } else { $hash{'param_'.$referid}=''.$newparam; } # # These parameters have to do with randomly selecting # resources, therefore a separate hash is also created to # make it easy to locate them when actually computing the resource set later on # See the code conditionalized by ($randomize) in loadmap(). if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) { # Random selection turned on $randompick{$referid}=$token->[2]->{'value'}; } if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { # Randomseed provided. $randompickseed{$referid}=$token->[2]->{'value'}; } if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) { # Random order turned on. $randomorder{$referid}=$token->[2]->{'value'}; } # These parameters have to do with how the URLs of resources are presented to # course members(?). encrypturl presents encypted url's while # hiddenresource hides the URL. # if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) { if ($token->[2]->{'value'}=~/^yes$/i) { $encurl{$referid}=1; } } if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) { if ($token->[2]->{'value'}=~/^yes$/i) { $hiddenurl{$referid}=1; } } } # # Parse mapalias parameters. # these are tags of the form: # # A map alias is a textual name for a resource: # - The to attribute identifies the resource (this gets level qualified below) # - The value attributes provides the alias string. # - name must be of the regexp form: /^parameter_(0_)*mapalias$/ # - e.g. the string 'parameter_' followed by 0 or more "0_" strings # terminating with the string 'mapalias'. # Examples: # 'parameter_mapalias', 'parameter_0_mapalias', parameter_0_0_mapalias' # Invalid to ids are silently ignored. # # Parameters: # token - The token array fromthe HMTML::TokeParser # lpc - The current map level counter. # sub parse_mapalias_param { my ($token,$lpc) = @_; # Fully qualify the to value and ignore the alias if there is no # corresponding resource. my $referid=$lpc.'.'.$token->[2]->{'to'}; return if (!exists($hash{'src_'.$referid})); # If this is a valid mapalias parameter, # Append the target id to the count_mapalias element for that # alias so that we can detect doubly defined aliases # e.g.: # # # # The example above is trivial but the case that's important has to do with # constructing a map that includes a nested map where the nested map may have # aliases that conflict with aliases established in the enclosing map. # # ...and create/update the hash mapalias entry to actually store the alias. # if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) { &count_mapalias($token->[2]->{'value'},$referid); $hash{'mapalias_'.$token->[2]->{'value'}}=$referid; } } # --------------------------------------------------------- Simplify expression # # Someone should really comment this to describe what it does to what and why. # sub simplify { my $expression=shift; # (0&1) = 1 $expression=~s/\(0\&([_\.\d]+)\)/$1/g; # (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 $expression; } # -------------------------------------------------------- Build condition hash # # Traces a route recursively through the map after it has been loaded # (I believe this really visits each resourcde that is reachable fromt he # start top node. # # - Marks hidden resources as hidden. # - Marks which resource URL's must be encrypted. # - Figures out (if necessary) the first resource in the map. # - Further builds the chunks of the big hash that define how # conditions work # # Note that the tracing strategy won't visit resources that are not linked to # anything or islands in the map (groups of resources that form a path but are not # linked in to the path that can be traced from the start resource...but that's ok # because by definition, those resources are not reachable by users of the course. # # Parameters: # sofar - _URI of the prior entry or 0 if this is the top. # rid - URI of the resource to visit. # beenhere - list of resources (each resource enclosed by &'s) that have # already been visited. # encflag - If true the resource that resulted in a recursive call to us # has an encoded URL (which means contained resources should too). # hdnflag - If true,the resource that resulted in a recursive call to us # was hidden (which means contained resources should be hidden too). # Returns # new value indicating how far the map has been traversed (the sofar). # sub traceroute { my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_; my $newsofar=$sofar=simplify($sofar); unless ($beenhere=~/\&\Q$rid\E\&/) { $beenhere.=$rid.'&'; my ($mapid,$resid)=split(/\./,$rid); my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid}); my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb); if ($hdnflag || lc($hidden) eq 'yes') { $hiddenurl{$rid}=1; } if (!$hdnflag && lc($hidden) eq 'no') { delete($hiddenurl{$rid}); } my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb); if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; } if (($retfrid eq '') && ($hash{'src_'.$rid}) && ($hash{'src_'.$rid}!~/\.sequence$/)) { $retfrid=$rid; } if (defined($hash{'conditions_'.$rid})) { $hash{'conditions_'.$rid}=simplify( '('.$hash{'conditions_'.$rid}.')|('.$sofar.')'); } else { $hash{'conditions_'.$rid}=$sofar; } # if the expression is just the 0th condition keep it # otherwise leave a pointer to this condition expression $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid; # Recurse if the resource is a map: if (defined($hash{'is_map_'.$rid})) { if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) { $sofar=$newsofar= &traceroute($sofar, $hash{'map_start_'.$hash{'src_'.$rid}}, $beenhere, $encflag || $encurl{$rid}, $hdnflag || $hiddenurl{$rid}); } } # Processes links to this resource: # - verify the existence of any conditionals on the link to here. # - Recurse to any resources linked to us. # if (defined($hash{'to_'.$rid})) { foreach my $id (split(/\,/,$hash{'to_'.$rid})) { my $further=$sofar; # # If there's a condition associated with this link be sure # it's been defined else that's an error: # if ($hash{'undercond_'.$id}) { if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) { $further=simplify('('.'_'.$rid.')&('. $hash{'condid_'.$hash{'undercond_'.$id}}.')'); } else { $errtext.= '
'. &mt('Undefined condition ID: [_1]', $hash{'undercond_'.$id}); } } # Recurse to resoruces that have to's to us. $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere, $encflag,$hdnflag); } } } return $newsofar; } # ------------------------------ Cascading conditions, quick access, parameters # # Seems a rather strangely named sub given what the comment above says it does. sub accinit { my ($uri,$short,$fn)=@_; my %acchash=(); my %captured=(); my $condcounter=0; $acchash{'acc.cond.'.$short.'.0'}=0; # This loop is only interested in conditions and # parameters in the big hash: foreach my $key (keys(%hash)) { # conditions: if ($key=~/^conditions/) { my $expr=$hash{$key}; # try to find and factor out common sub-expressions # Any subexpression that is found is simplified, removed from # the original condition expression and the simplified sub-expression # substituted back in to the epxression..I'm not actually convinced this # factors anything out...but instead maybe simplifies common factors(?) foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) { my $orig=$sub; my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/); next if (!defined($factor)); $sub=~s/\Q$factor\E//g; $sub=~s/^\(/\($factor\(/; $sub.=')'; $sub=simplify($sub); $expr=~s/\Q$orig\E/$sub/; } $hash{$key}=$expr; # If not yet seen, record in acchash and that we've seen it. unless (defined($captured{$expr})) { $condcounter++; $captured{$expr}=$condcounter; $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr; } # Parameters: } elsif ($key=~/^param_(\d+)\.(\d+)/) { my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2, $hash{'src_'.$1.'.'.$2}); foreach my $param (split(/\&/,$hash{$key})) { my ($typename,$value)=split(/\=/,$param); my ($type,$name)=split(/\:/,$typename); $parmhash{$prefix.'.'.&unescape($name)}= &unescape($value); $parmhash{$prefix.'.'.&unescape($name).'.type'}= &unescape($type); } } } # This loop only processes id entries in the big hash. foreach my $key (keys(%hash)) { if ($key=~/^ids/) { foreach my $resid (split(/\,/,$hash{$key})) { my $uri=$hash{'src_'.$resid}; my ($uripath,$urifile) = &Apache::lonnet::split_uri_for_cond($uri); 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}=~ /(\&\Q$urifile\E\:[^\&]*)/) { my $replace=$1; my $regexp=$replace; #$regexp=~s/\|/\\\|/g; $acchash{'acc.res.'.$short.'.'.$uripath} =~ s/\Q$regexp\E/$replace\|$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\///; my $regexp = 1; &Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp); &Apache::lonnet::appenv(\%acchash); } # ---------------- Selectively delete from randompick maps and hidden url parms sub hiddenurls { my $randomoutentry=''; foreach my $rid (keys(%randompick)) { my $rndpick=$randompick{$rid}; my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}}; # ------------------------------------------- put existing resources into array my @currentrids=(); foreach my $key (sort(keys(%hash))) { if ($key=~/^src_($mpc\.\d+)/) { if ($hash{'src_'.$1}) { push @currentrids, $1; } } } # rids are number.number and we want to numercially sort on # the second number @currentrids=sort { my (undef,$aid)=split(/\./,$a); my (undef,$bid)=split(/\./,$b); $aid <=> $bid; } @currentrids; next if ($#currentrids<$rndpick); # -------------------------------- randomly eliminate the ones that should stay my (undef,$id)=split(/\./,$rid); if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; } my $setcode; if (defined($randomizationcode{$rid})) { if ($env{'form.CODE'} eq '') { $env{'form.CODE'} = $randomizationcode{$rid}; $setcode = 1; } } my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb if ($setcode) { undef($env{'form.CODE'}); undef($setcode); } &Apache::lonnet::setup_random_from_rndseed($rndseed); my @whichids=&Math::Random::random_permuted_index($#currentrids+1); for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; } #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids)); # -------------------------------------------------------- delete the leftovers for (my $k=0; $k<=$#currentrids; $k++) { if ($currentrids[$k]) { $hash{'randomout_'.$currentrids[$k]}=1; my ($mapid,$resid)=split(/\./,$currentrids[$k]); if ($rescount{$mapid}) { $rescount{$mapid} --; } if ($hash{'is_map_'.$currentrids[$k]}) { if ($mapcount{$mapid}) { $mapcount{$mapid} --; } } $randomoutentry.='&'. &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, $resid, $hash{'src_'.$currentrids[$k]} ).'&'; } } } # ------------------------------ take care of explicitly hidden urls or folders foreach my $rid (keys(%hiddenurl)) { $hash{'randomout_'.$rid}=1; my ($mapid,$resid)=split(/\./,$rid); if ($rescount{$mapid}) { $rescount{$mapid} --; } if ($hash{'is_map_'.$rid}) { if ($mapcount{$mapid}) { $mapcount{$mapid} --; } } $randomoutentry.='&'. &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid, $hash{'src_'.$rid}).'&'; } # --------------------------------------- append randomout entry to environment if ($randomoutentry) { &Apache::lonnet::appenv({'acc.randomout' => $randomoutentry}); } } # -------------------------------------- populate big hash with map breadcrumbs # Create map_breadcrumbs_$pc from map_hierarchy_$pc by omitting intermediate # maps not shown in Course Contents table. sub mapcrumbs { foreach my $key (keys(%rescount)) { if ($hash{'map_hierarchy_'.$key}) { my $skipnext = 0; foreach my $id (split(/,/,$hash{'map_hierarchy_'.$key}),$key) { unless ($skipnext) { $hash{'map_breadcrumbs_'.$key} .= "$id,"; } unless (($id == 0) || ($id == 1)) { if ((!$rescount{$id}) || ($rescount{$id} == 1 && $mapcount{$id} == 1)) { $skipnext = 1; } else { $skipnext = 0; } } } $hash{'map_breadcrumbs_'.$key} =~ s/,$//; } } } # ---------------------------------------------------- Read map and all submaps sub readmap { my $short=shift; $short=~s/^\///; # TODO: Hidden dependency on current user: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1}); my $fn=$cenv{'fn'}; my $uri; $short=~s/\//\_/g; unless ($uri=$cenv{'url'}) { &Apache::lonnet::logthis('WARNING: '. "Could not load course $short."); return ('',&mt('No course data available.'));; } @cond=('true:normal'); unless (open(LOCKFILE,">","$fn.db.lock")) { # # Most likely a permissions problem on the lockfile or its directory. # $retfurl = ''; return ($retfurl,'
'.&mt('Map not loaded - Lock file could not be opened when reading map:').' '.$fn.'.'); } my $lock=0; my $gotstate=0; # If we can get the lock without delay any files there are idle # and from some prior request. We'll kill them off and regenerate them: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) { $lock=1; # Remember that we hold the lock. &unlink_tmpfiles($fn); } undef %randompick; undef %randompickseed; undef %randomorder; undef %randomizationcode; undef %hiddenurl; undef %encurl; undef %rescount; undef %mapcount; $retfrid=''; $errtext=''; my ($untiedhash,$untiedparmhash,$tiedhash,$tiedparmhash); # More state flags. # if we got the lock, regenerate course regnerate empty files and tie them. if ($lock) { if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) { $tiedhash = 1; if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) { $tiedparmhash = 1; $gotstate = &build_tmp_hashes($uri, $fn, $short, \%cenv); # TODO: Need to provide requested user@dom unless ($gotstate) { &Apache::lonnet::logthis('Failed to write statemap at first attempt '.$fn.' for '.$uri.'.'); } $untiedparmhash = untie(%parmhash); unless ($untiedparmhash) { &Apache::lonnet::logthis('WARNING: '. 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.'); } } $untiedhash = untie(%hash); unless ($untiedhash) { &Apache::lonnet::logthis('WARNING: '. 'Could not untie coursemap hash '.$fn.' for '.$uri.'.'); } } flock(LOCKFILE,LOCK_UN); # RF: this is what I don't get unless there are other # unlocked places the remainder happens..seems like if we # just kept the lock here the rest of the code would have # been much easier? } unless ($lock && $tiedhash && $tiedparmhash) { # if we are here it is likely because we are already trying to # initialize the course in another child, busy wait trying to # tie the hashes for the next 90 seconds, if we succeed forward # them on to navmaps, if we fail, throw up the Could not init # course screen # # RF: I'm not seeing the case where the ties/unties can fail in a way # that can be remedied by this. Since we owned the lock seems # Tie/untie failures are a result of something like a permissions problem instead? # # In any vent, undo what we did manage to do above first: if ($lock) { # Got the lock but not the DB files flock(LOCKFILE,LOCK_UN); $lock = 0; } if ($tiedhash) { unless($untiedhash) { untie(%hash); } } if ($tiedparmhash) { unless($untiedparmhash) { untie(%parmhash); } } # Log our failure: &Apache::lonnet::logthis('WARNING: '. "Could not tie coursemap $fn for $uri."); $tiedhash = ''; $tiedparmhash = ''; my $i=0; # Keep on retrying the lock for 90 sec until we succeed. while($i<90) { $i++; sleep(1); if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) { # Got the lock, tie the hashes...the assumption in this code is # that some other worker thread has created the db files quite recently # so no load is needed: $lock = 1; if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) { $tiedhash = 1; if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) { $tiedparmhash = 1; if (-e "$fn.state") { $retfurl='/adm/navmaps'; # BUG BUG: Side effect! # Should conditionalize on something so that we can use this # to load maps for courses that are not current? # &Apache::lonnet::appenv({"request.course.id" => $short, "request.course.fn" => $fn, "request.course.uri" => $uri, "request.course.tied" => time}); $untiedhash = untie(%hash); $untiedparmhash = untie(%parmhash); $gotstate = 1; last; } $untiedparmhash = untie(%parmhash); } $untiedhash = untie(%hash); } } } if ($lock) { flock(LOCKFILE,LOCK_UN); $lock = 0; if ($tiedparmhash) { unless ($untiedparmhash) { &Apache::lonnet::logthis('WARNING: '. 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.'); } } if ($tiedparmhash) { unless ($untiedhash) { &Apache::lonnet::logthis('WARNING: '. 'Could not untie coursemap hash '.$fn.' for '.$uri.'.'); } } } } # I think this branch of code is all about what happens if we just did the stuff above, # but found that the state file did not exist...again if we'd just held the lock # would that have made this logic simpler..as generating all the files would be # an atomic operation with respect to the lock. # unless ($gotstate) { $lock = 0; &Apache::lonnet::logthis('WARNING: '. 'Could not read statemap '.$fn.' for '.$uri.'.'); &unlink_tmpfiles($fn); if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) { $lock=1; } undef %randompick; undef %randompickseed; undef %randomorder; undef %randomizationcode; undef %hiddenurl; undef %encurl; undef %rescount; undef %mapcount; $errtext=''; $retfrid=''; # # Once more through the routine of tying and loading and so on. # if ($lock) { if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) { if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) { $gotstate = &build_tmp_hashes($uri,$fn,$short,\%cenv); # TODO: User dependent? unless ($gotstate) { &Apache::lonnet::logthis('WARNING: '. 'Failed to write statemap at second attempt '.$fn.' for '.$uri.'.'); } unless (untie(%parmhash)) { &Apache::lonnet::logthis('WARNING: '. 'Could not untie coursemap parmhash '.$fn.'.db for '.$uri.'.'); } } else { &Apache::lonnet::logthis('WARNING: '. 'Could not tie coursemap '.$fn.'__parms.db for '.$uri.'.'); } unless (untie(%hash)) { &Apache::lonnet::logthis('WARNING: '. 'Could not untie coursemap hash '.$fn.'.db for '.$uri.'.'); } } else { &Apache::lonnet::logthis('WARNING: '. 'Could not tie coursemap '.$fn.'.db for '.$uri.'.'); } flock(LOCKFILE,LOCK_UN); $lock = 0; } else { # Failed to get the immediate lock. &Apache::lonnet::logthis('WARNING: '. 'Could not obtain lock to tie coursemap hash '.$fn.'.db for '.$uri.'.'); } } close(LOCKFILE); unless (($errtext eq '') || ($env{'request.course.uri'} =~ m{^/uploaded/})) { &Apache::lonmsg::author_res_msg($env{'request.course.uri'}, $errtext); # TODO: User dependent? } # ------------------------------------------------- Check for critical messages # Depends on user must parameterize this as well..or separate as this is: # more part of determining what someone sees on entering a course? my @what=&Apache::lonnet::dump('critical',$env{'user.domain'}, $env{'user.name'}); if ($what[0]) { if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { $retfurl='/adm/email?critical=display'; } } return ($retfurl,$errtext); } # # This sub is called when the course hash and the param hash have been tied and # their lock file is held. # Parameters: # $uri - URI that identifies the course. # $fn - The base path/filename of the files that make up the context # being built. # $short - Short course name. # $cenvref - Reference to the course environment hash returned by # Apache::lonnet::coursedescription # # Assumptions: # The globals # %hash, %paramhash are tied to their gdbm files and we hold the lock on them. # sub build_tmp_hashes { my ($uri,$fn,$short,$cenvref) = @_; unless(ref($cenvref) eq 'HASH') { return; } my %cenv = %{$cenvref}; my $gotstate = 0; %hash=(); # empty the global course and parameter hashes. %parmhash=(); $errtext=''; # No error messages yet. $pc=0; &clear_mapalias_count(); &processversionfile(%cenv); # URI Of the map file. my $furi=&Apache::lonnet::clutter($uri); # # the map staring points. # $hash{'src_0.0'}=&versiontrack($furi); $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title'); $hash{'ids_'.$furi}='0.0'; $hash{'is_map_0.0'}=1; # Load the map.. note that loadmap may implicitly recurse if the map contains # sub-maps. &loadmap($uri,'0.0',$short); # The code below only executes if there is a starting point for the map> # Q/BUG??? If there is no start resource for the map should that be an error? # if (defined($hash{'map_start_'.$uri})) { &Apache::lonnet::appenv({"request.course.id" => $short, "request.course.fn" => $fn, "request.course.uri" => $uri, "request.course.tied" => time}); $env{'request.course.id'}=$short; &traceroute('0',$hash{'map_start_'.$uri},'&'); &accinit($uri,$short,$fn); &hiddenurls(); &mapcrumbs(); } $errtext .= &get_mapalias_errors(); # ------------------------------------------------------- Put versions into src foreach my $key (keys(%hash)) { if ($key=~/^src_/) { $hash{$key}=&putinversion($hash{$key}); } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) { my ($type, $url) = ($1,$2); my $value = $hash{$key}; $hash{$type.&putinversion($url)}=$value; } } # ---------------------------------------------------------------- Encrypt URLs foreach my $id (keys(%encurl)) { # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id}); $hash{'encrypted_'.$id}=1; } # ----------------------------------------------- Close hashes to finally store # --------------------------------- Routine must pass this point, no early outs $hash{'first_rid'}=$retfrid; my ($mapid,$resid)=split(/\./,$retfrid); $hash{'first_mapurl'}=$hash{'map_id_'.$mapid}; my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid}); $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb }); if ($hash{'encrypted_'.$retfrid}) { $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F')); } $hash{'first_url'}=$retfurl; # ---------------------------------------------------- Store away initial state { my $cfh; if (open($cfh,">","$fn.state")) { print $cfh join("\n",@cond); $gotstate = 1; } else { &Apache::lonnet::logthis("WARNING: ". "Could not write statemap $fn for $uri."); } } return $gotstate; } sub unlink_tmpfiles { my ($fn) = @_; my $file_dir = dirname($fn); if ("$file_dir/" eq LONCAPA::tempdir()) { my @files = qw (.db _symb.db .state _parms.db); foreach my $file (@files) { if (-e $fn.$file) { unless (unlink($fn.$file)) { &Apache::lonnet::logthis("WARNING: ". "Could not unlink ".$fn.$file.""); } } } } return; } # ------------------------------------------------------- Evaluate state string sub evalstate { my $fn=$env{'request.course.fn'}.'.state'; my $state=''; if (-e $fn) { my @conditions=(); { open(my $fh,"<",$fn); @conditions=<$fh>; close($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 my $line (@conditions) { chomp($line); my ($condition,$weight)=split(/\:/,$line); if ($safeeval->reval($condition)) { if ($weight eq 'force') { $state.='3'; } else { $state.='2'; } } else { if ($weight eq 'stop') { $state.='0'; } else { $state.='1'; } } } } &Apache::lonnet::appenv({'user.state.'.$env{'request.course.id'} => $state}); return $state; } # This block seems to have code to manage/detect doubly defined # aliases in maps. { my %mapalias_cache; sub count_mapalias { my ($value,$resid) = @_; push(@{ $mapalias_cache{$value} }, $resid); } sub get_mapalias_errors { my $error_text; foreach my $mapalias (sort(keys(%mapalias_cache))) { next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1); my $count; my $which = join('
  • ', map { my $id = $_; if (exists($hash{'src_'.$id})) { $count++; } my ($mapid) = split(/\./,$id); &mt('Resource [_1][_2]in Map [_3]', $hash{'title_'.$id},'
    ', $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}}); } (@{ $mapalias_cache{$mapalias} })); next if ($count < 2); $error_text .= '
    '. &mt('Error: Found the mapalias "[_1]" defined multiple times.', $mapalias). '
    • '.$which.'
    '; } &clear_mapalias_count(); return $error_text; } sub clear_mapalias_count { undef(%mapalias_cache); } } 1; __END__ =head1 NAME Apache::lonuserstate - Construct and maintain state and binary representation of course for user =head1 SYNOPSIS Invoked by lonroles.pm. &Apache::lonuserstate::readmap($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 SUBROUTINES =over =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