--- loncom/interface/lonhelper.pm 2003/04/11 17:45:37 1.7 +++ loncom/interface/lonhelper.pm 2003/05/16 17:20:51 1.31 @@ -1,7 +1,7 @@ # The LearningOnline Network with CAPA # .helper XML handler to implement the LON-CAPA helper # -# $Id: lonhelper.pm,v 1.7 2003/04/11 17:45:37 bowersj2 Exp $ +# $Id: lonhelper.pm,v 1.31 2003/05/16 17:20:51 bowersj2 Exp $ # # Copyright Michigan State University Board of Trustees # @@ -30,10 +30,6 @@ # (.helper handler # -# FIXME: Change register calls to register with the helper. -# Then have the helper reg and unreg the tags. -# This removes my concerns about breaking other code. - =pod =head1 lonhelper - HTML Helper framework for LON-CAPA @@ -57,7 +53,10 @@ Each state contains one or more state el messages, resource selections, or date queries. The helper tag is required to have one attribute, "title", which is the name -of the helper itself, such as "Parameter helper". +of the helper itself, such as "Parameter helper". The helper tag may optionally +have a "requiredpriv" attribute, specifying the priviledge a user must have +to use the helper, or get denied access. See loncom/auth/rolesplain.tab for +useful privs. Default is full access, which is often wrong! =head2 State tags @@ -88,6 +87,77 @@ Of course this does nothing. In order fo necessary to put actual elements into the wizard. Documentation for each of these elements follows. +=head2 Creating a Helper With Code, Not XML + +In some situations, such as the printing wizard (see lonprintout.pm), +writing the helper in XML would be too complicated, because of scope +issues or the fact that the code actually outweighs the XML. It is +possible to create a helper via code, though it is a little odd. + +Creating a helper via code is more like issuing commands to create +a helper then normal code writing. For instance, elements will automatically +be added to the last state created, so it's important to create the +states in the correct order. + +First, create a new helper: + + use Apache::lonhelper; + + my $helper = Apache::lonhelper::new->("Helper Title"); + +Next you'll need to manually add states to the helper: + + Apache::lonhelper::state->new("STATE_NAME", "State's Human Title"); + +You don't need to save a reference to it because all elements up until +the next state creation will automatically be added to this state. + +Elements are created by populating the $paramHash in +Apache::lonhelper::paramhash. To prevent namespace issues, retrieve +a reference to that has with getParamHash: + + my $paramHash = Apache::lonhelper::getParamHash(); + +You will need to do this for each state you create. + +Populate the $paramHash with the parameters for the element you wish +to add next; the easiest way to find out what those entries are is +to read the code. Some common ones are 'variable' to record the variable +to store the results in, and NEXTSTATE to record a next state transition. + +Then create your element: + + $paramHash->{MESSAGETEXT} = "This is a message."; + Apache::lonhelper::message->new(); + +The creation will take the $paramHash and bless it into a +Apache::lonhelper::message object. To create the next element, you need +to get a reference to the new, empty $paramHash: + + $paramHash = Apache::lonhelper::getParamHash(); + +and you can repeat creating elements that way. You can add states +and elements as needed. + +See lonprintout.pm, subroutine printHelper for an example of this, where +we dynamically add some states to prevent security problems, for instance. + +Normally the machinery in the XML format is sufficient; dynamically +adding states can easily be done by wrapping the state in a +tag. This should only be used when the code dominates the XML content, +the code is so complicated that it is difficult to get access to +all of the information you need because of scoping issues, or so much +of the information used is persistent because would-be or + blocks that using the {DATA} mechanism results in hard-to-read +and -maintain code. + +It is possible to do some of the work with an XML fragment parsed by +lonxml; again, see lonprintout.pm for an example. In that case it is +imperative that you call B +before parsing XML fragments and B +when you are done. See lonprintout.pm for examples of this usage in the +printHelper subroutine. + =cut package Apache::lonhelper; @@ -126,15 +196,47 @@ my $substate; # end of the element tag is located. my $paramHash; +# Note from Jeremy 5-8-2003: It is *vital* that the real handler be called +# as a subroutine from the handler, or very mysterious things might happen. +# I don't know exactly why, but it seems that the scope where the Apache +# server enters the perl handler is treated differently from the rest of +# the handler. This also seems to manifest itself in the debugger as entering +# the perl handler in seemingly random places (sometimes it starts in the +# compiling phase, sometimes in the handler execution phase where it runs +# the code and stepping into the "1;" the module ends with goes into the handler, +# sometimes starting directly with the handler); I think the cause is related. +# In the debugger, this means that breakpoints are ignored until you step into +# a function and get out of what must be a "faked up scope" in the Apache-> +# mod_perl connection. In this code, it was manifesting itself in the existence +# of two seperate file-scoped $helper variables, one set to the value of the +# helper in the helper constructor, and one referenced by the handler on the +# "$helper->process()" line. The second was therefore never set, and was still +# undefined when I tried to call process on it. +# By pushing the "real handler" down into the "real scope", everybody except the +# actual handler function directly below this comment gets the same $helper and +# everybody is happy. +# The upshot of all of this is that for safety when a handler is using +# file-scoped variables in LON-CAPA, the handler should be pushed down one +# call level, as I do here, to ensure that the top-level handler function does +# not get a different file scope from the rest of the code. sub handler { my $r = shift; - $ENV{'request.uri'} = $r->uri(); - my $filename = '/home/httpd/html' . $r->uri(); + return real_handler($r); +} + +# For debugging purposes, one can send a second parameter into this +# function, the 'uri' of the helper you wish to have rendered, and +# call this from other handlers. +sub real_handler { + my $r = shift; + my $uri = shift; + if (!defined($uri)) { $uri = $r->uri(); } + $ENV{'request.uri'} = $uri; + my $filename = '/home/httpd/html' . $uri; my $fh = Apache::File->new($filename); my $file; read $fh, $file, 100000000; - Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING}); # Send header, don't cache this page if ($r->header_only) { @@ -158,8 +260,29 @@ sub handler { # xml parsing &Apache::lonxml::xmlparse($r, 'helper', $file); + my $allowed = $helper->allowedCheck(); + if (!$allowed) { + $ENV{'user.error.msg'} = $ENV{'request.uri'}.':'.$helper->{REQUIRED_PRIV}. + ":0:0:Permission denied to access this helper."; + return HTTP_NOT_ACCEPTABLE; + } + + $helper->process(); + $r->print($helper->display()); - return OK; + return OK; +} + +sub registerHelperTags { + for my $tagList (@helperTags) { + Apache::lonxml::register($tagList->[0], $tagList->[1]); + } +} + +sub unregisterHelperTags { + for my $tagList (@helperTags) { + Apache::lonxml::deregister($tagList->[0], $tagList->[1]); + } } sub start_helper { @@ -169,11 +292,9 @@ sub start_helper { return ''; } - for my $tagList (@helperTags) { - Apache::lonxml::register($tagList->[0], $tagList->[1]); - } - - $helper = Apache::lonhelper::helper->new($token->[2]{'title'}); + registerHelperTags(); + + Apache::lonhelper::helper->new($token->[2]{'title'}, $token->[2]{'requiredpriv'}); return ''; } @@ -184,9 +305,7 @@ sub end_helper { return ''; } - for my $tagList (@helperTags) { - Apache::lonxml::deregister($tagList->[0], $tagList->[1]); - } + unregisterHelperTags(); return ''; } @@ -198,11 +317,22 @@ sub start_state { return ''; } - $state = Apache::lonhelper::state->new($token->[2]{'name'}, - $token->[2]{'title'}); + Apache::lonhelper::state->new($token->[2]{'name'}, + $token->[2]{'title'}); return ''; } +# Use this to get the param hash from other files. +sub getParamHash { + return $paramHash; +} + +# Use this to get the helper, if implementing elements in other files +# (like lonprintout.pm) +sub getHelper { + return $helper; +} + # don't need this, so ignore it sub end_state { return ''; @@ -223,6 +353,7 @@ sub new { my $self = {}; $self->{TITLE} = shift; + $self->{REQUIRED_PRIV} = shift; # If there is a state from the previous form, use that. If there is no # state, use the start state parameter. @@ -287,6 +418,15 @@ sub new { $self->{STATES} = {}; $self->{DONE} = 0; + # Used by various helpers for various things; see lonparm.helper + # for an example. + $self->{DATA} = {}; + + $helper = $self; + + # Establish the $paramHash + $paramHash = {}; + bless($self, $class); return $self; } @@ -330,10 +470,24 @@ sub declareVar { my $envname = 'form.' . $var . '.forminput'; if (defined($ENV{$envname})) { - $self->{VARS}->{$var} = $ENV{$envname}; + if (ref($ENV{$envname})) { + $self->{VARS}->{$var} = join('|||', @{$ENV{$envname}}); + } else { + $self->{VARS}->{$var} = $ENV{$envname}; + } } } +sub allowedCheck { + my $self = shift; + + if (!defined($self->{REQUIRED_PRIV})) { + return 1; + } + + return Apache::lonnet::allowed($self->{REQUIRED_PRIV}, $ENV{'request.course.id'}); +} + sub changeState { my $self = shift; $self->{STATE} = shift; @@ -347,23 +501,15 @@ sub registerState { $self->{STATES}{$stateName} = $state; } -# Done in four phases -# 1: Do the post processing for the previous state. -# 2: Do the preprocessing for the current state. -# 3: Check to see if state changed, if so, postprocess current and move to next. -# Repeat until state stays stable. -# 4: Render the current state to the screen as an HTML page. -sub display { +sub process { my $self = shift; - my $result = ""; - # Phase 1: Post processing for state of previous screen (which is actually # the "current state" in terms of the helper variables), if it wasn't the # beginning state. if ($self->{STATE} ne "START" || $ENV{"form.SUBMIT"} eq "Next ->") { my $prevState = $self->{STATES}{$self->{STATE}}; - $prevState->postprocess(); + $prevState->postprocess(); } # Note, to handle errors in a state's input that a user must correct, @@ -372,25 +518,45 @@ sub display { # Phase 2: Preprocess current state my $startState = $self->{STATE}; - my $state = $self->{STATES}{$startState}; + my $state = $self->{STATES}->{$startState}; - # Error checking; it is intended that the developer will have - # checked all paths and the user can't see this! + # For debugging, print something here to determine if you're going + # to an undefined state. if (!defined($state)) { - $result .="Error! The state ". $startState ." is not defined."; - return $result; + return; } $state->preprocess(); # Phase 3: While the current state is different from the previous state, # keep processing. - while ( $startState ne $self->{STATE} ) + while ( $startState ne $self->{STATE} && + defined($self->{STATES}->{$self->{STATE}}) ) { $startState = $self->{STATE}; - $state = $self->{STATES}{$startState}; + $state = $self->{STATES}->{$startState}; $state->preprocess(); } + return; +} + +# 1: Do the post processing for the previous state. +# 2: Do the preprocessing for the current state. +# 3: Check to see if state changed, if so, postprocess current and move to next. +# Repeat until state stays stable. +# 4: Render the current state to the screen as an HTML page. +sub display { + my $self = shift; + + my $state = $self->{STATES}{$self->{STATE}}; + + my $result = ""; + + if (!defined($state)) { + $result = "Error: state '$state' not defined!"; + return $result; + } + # Phase 4: Display. my $stateTitle = $state->title(); my $bodytag = &Apache::loncommon::bodytag("$self->{TITLE}",'',''); @@ -402,19 +568,24 @@ sub display { $bodytag HEADER - if (!$state->overrideForm()) { $result.="
"; } + if (!$state->overrideForm()) { $result.=""; } $result .= < + @@ -474,6 +665,8 @@ sub new { $helper->registerState($self); + $state = $self; + return $self; } @@ -517,7 +710,16 @@ sub postprocess { } } +# Override the form if any element wants to. +# two elements overriding the form will make a mess, but that should +# be considered helper author error ;-) sub overrideForm { + my $self = shift; + for my $element (@{$self->{ELEMENTS}}) { + if ($element->overrideForm()) { + return 1; + } + } return 0; } @@ -535,6 +737,7 @@ sub render { for my $element (@{$self->{ELEMENTS}}) { push @results, $element->render(); } + return join("\n", @results); } @@ -547,29 +750,47 @@ package Apache::lonhelper::element; =head2 Element Base Class -The Apache::lonhelper::element base class provides support methods for -the elements to use, such as a multiple value processer. +The Apache::lonhelper::element base class provides support for elements +and defines some generally useful tags for use in elements. -B: +B -=over 4 - -=item * process_multiple_choices(formName, varName): Process the form -element named "formName" and place the selected items into the helper -variable named varName. This is for things like checkboxes or -multiple-selection listboxes where the user can select more then -one entry. The selected entries are delimited by triple pipes in -the helper variables, like this: - - CHOICE_1|||CHOICE_2|||CHOICE_3 - -=back +Each element can contain a "finalcode" tag that, when the special FINAL +helper state is used, will be executed, surrounded by "sub { my $helper = shift;" +and "}". It is expected to return a string describing what it did, which +may be an empty string. See course initialization helper for an example. This is +generally intended for helpers like the course initialization helper, which consist +of several panels, each of which is performing some sort of bite-sized functionality. + +B + +Each element that accepts user input can contain a "defaultvalue" tag that, +when surrounded by "sub { my $helper = shift; my $state = shift; " and "}", +will form a subroutine that when called will provide a default value for +the element. How this value is interpreted by the element is specific to +the element itself, and possibly the settings the element has (such as +multichoice vs. single choice for tags). + +This is also intended for things like the course initialization wizard, where the +user is setting various parameters. By correctly grabbing current settings +and including them into the helper, it allows the user to come back to the +helper later and re-execute it, without needing to worry about overwriting +some setting accidentally. + +Again, see the course initialization helper for examples. + +B + +If the element stores the name of the variable in a 'variable' member, which +the provided ones all do, you can retreive the value of the variable by calling +this method. =cut BEGIN { &Apache::lonhelper::register('Apache::lonhelper::element', - ('nextstate')); + ('nextstate', 'finalcode', + 'defaultvalue')); } # Because we use the param hash, this is often a sufficent @@ -604,6 +825,36 @@ sub start_nextstate { sub end_nextstate { return ''; } +sub start_finalcode { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + $paramHash->{FINAL_CODE} = &Apache::lonxml::get_all_text('/finalcode', + $parser); + return ''; +} + +sub end_finalcode { return ''; } + +sub start_defaultvalue { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + $paramHash->{DEFAULT_VALUE} = &Apache::lonxml::get_all_text('/defaultvalue', + $parser); + $paramHash->{DEFAULT_VALUE} = 'sub { my $helper = shift; my $state = shift;' . + $paramHash->{DEFAULT_VALUE} . '}'; + return ''; +} + +sub end_defaultvalue { return ''; } + sub preprocess { return 1; } @@ -616,29 +867,13 @@ sub render { return ''; } -sub process_multiple_choices { - my $self = shift; - my $formname = shift; - my $var = shift; +sub overrideForm { + return 0; +} - my $formvalue = $ENV{'form.' . $formname}; - if ($formvalue) { - # Must extract values from querystring directly, as there - # may be more then one. - my @values; - for my $formparam (split (/&/, $ENV{QUERY_STRING})) { - my ($name, $value) = split(/=/, $formparam); - if ($name ne $formname) { - next; - } - $value =~ tr/+/ /; - $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg; - push @values, $value; - } - $helper->{VARS}->{$var} = join('|||', @values); - } - - return; +sub getValue { + my $self = shift; + return $helper->{VARS}->{$self->{'variable'}}; } 1; @@ -680,7 +915,7 @@ use strict; BEGIN { &Apache::lonhelper::register('Apache::lonhelper::message', - ('message', 'message_text')); + ('message')); } sub new { @@ -690,31 +925,30 @@ sub new { # CONSTRUCTION: Construct the message element from the XML sub start_message { - return ''; -} - -sub end_message { my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; if ($target ne 'helper') { return ''; } - Apache::lonhelper::message->new(); + + $paramHash->{MESSAGE_TEXT} = &Apache::lonxml::get_all_text('/message', + $parser); + + if (defined($token->[2]{'nextstate'})) { + $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'}; + } return ''; } -sub start_message_text { +sub end_message { my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; if ($target ne 'helper') { return ''; } - - $paramHash->{MESSAGE_TEXT} = &Apache::lonxml::get_all_text('/message_text', - $parser); + Apache::lonhelper::message->new(); + return ''; } - -sub end_message_text { return 1; } sub render { my $self = shift; @@ -750,6 +984,10 @@ the result is stored in. takes an attribute "multichoice" which, if set to a true value, will allow the user to select multiple choices. + takes an attribute "allowempty" which, if set to a true +value, will allow the user to select none of the choices without raising +an error message. + B can have the following subtags: @@ -767,6 +1005,11 @@ B For example, Bobby McDormik. + can take a parameter "eval", which if set to + a true value, will cause the contents of the tag to be + evaluated as it would be in an tag; see tag + below. + may optionally contain a 'nextstate' attribute, which will be the state transisitoned to if the choice is made, if the choice is not multichoice. @@ -794,7 +1037,17 @@ You can mix and match methods of creatin "push" onto the choice list, rather then wiping it out. (You can even remove choices programmatically, but that would probably be bad form.) -FIXME: Document and implement and in the element package. +B + +Choices supports default values both in multichoice and single choice mode. +In single choice mode, have the defaultvalue tag's function return the +computer value of the box you want checked. If the function returns a value +that does not correspond to any of the choices, the default behavior of selecting +the first choice will be preserved. + +For multichoice, return a string with the computer values you want checked, +delimited by triple pipes. Note this matches how the result of the +tag is stored in the {VARS} hash. =cut @@ -821,9 +1074,10 @@ sub start_choices { } # Need to initialize the choices list, so everything can assume it exists - $paramHash->{'variable'} = $token->[2]{'variable'}; + $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'})); $helper->declareVar($paramHash->{'variable'}); $paramHash->{'multichoice'} = $token->[2]{'multichoice'}; + $paramHash->{'allowempty'} = $token->[2]{'allowempty'}; $paramHash->{CHOICES} = []; return ''; } @@ -849,7 +1103,9 @@ sub start_choice { my $human = &Apache::lonxml::get_all_text('/choice', $parser); my $nextstate = $token->[2]{'nextstate'}; - push @{$paramHash->{CHOICES}}, [$human, $computer, $nextstate]; + my $evalFlag = $token->[2]{'eval'}; + push @{$paramHash->{CHOICES}}, [$human, $computer, $nextstate, + $evalFlag]; return ''; } @@ -867,17 +1123,25 @@ sub render { if ($self->{'multichoice'}) { $result .= < - function checkall(value) { - for (i=0; i SCRIPT + } + + # Only print "select all" and "unselect all" if there are five or + # more choices; fewer then that and it looks silly. + if ($self->{'multichoice'} && scalar(@{$self->{CHOICES}}) > 4) { $buttons = < - - + +
  BUTTONS } @@ -890,20 +1154,61 @@ BUTTONS $result .= "

$stateTitle

HEADER + $result .= "
"; + if (!$state->overrideForm()) { $result .= $self->_saveVars(); } - $result .= $state->render() . "

 

"; + $result .= $state->render(); + + $result .= "		"; + # Warning: Copy and pasted from below, because it's too much trouble to + # turn this into a subroutine if (!$state->overrideForm()) { - $result .= '
'; if ($self->{STATE} ne $self->{START_STATE}) { #$result .= '  '; } @@ -423,17 +594,37 @@ HEADER $result .= "End Helper"; } else { - $result .= '{VARS}}) { - $result .= "|$key| -> " . $self->{VARS}->{$key} . "
"; + $result .= "
"; + + # Warning: Copy and pasted from above, because it's too much trouble to + # turn this into a subroutine + if (!$state->overrideForm()) { + if ($self->{STATE} ne $self->{START_STATE}) { + #$result .= '  '; + } + if ($self->{DONE}) { + my $returnPage = $self->{RETURN_PAGE}; + $result .= "End Helper"; + } + else { + $result .= '{VARS}}) { + # $result .= "|$key| -> " . $self->{VARS}->{$key} . "
"; + #} + + $result .= "
"; + $result .= <
\n\n"; + my %checkedChoices; + my $checkedChoicesFunc; + + if (defined($self->{DEFAULT_VALUE})) { + $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE}); + die 'Error in default value code for variable ' . + {'variable'} . ', Perl said:' . $@ if $@; + } else { + $checkedChoicesFunc = sub { return ''; }; + } + + # Process which choices should be checked. + if ($self->{'multichoice'}) { + for my $selectedChoice (split(/\|\|\|/, (&$checkedChoicesFunc($helper, $self)))) { + $checkedChoices{$selectedChoice} = 1; + } + } else { + # single choice + my $selectedChoice = &$checkedChoicesFunc($helper, $self); + + my $foundChoice = 0; + + # check that the choice is in the list of choices. + for my $choice (@{$self->{CHOICES}}) { + if ($choice->[1] eq $selectedChoice) { + $checkedChoices{$choice->[1]} = 1; + $foundChoice = 1; + } + } + + # If we couldn't find the choice, pick the first one + if (!$foundChoice) { + $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1; + } + } + my $type = "radio"; if ($self->{'multichoice'}) { $type = 'checkbox'; } - my $checked = 0; foreach my $choice (@{$self->{CHOICES}}) { $result .= "\n\n"; $result .= "\n"; + my $choiceLabel = $choice->[0]; + if ($choice->[4]) { # if we need to evaluate this choice + $choiceLabel = "sub { my $helper = shift; my $state = shift;" . + $choiceLabel . "}"; + $choiceLabel = eval($choiceLabel); + $choiceLabel = &$choiceLabel($helper, $self); + } + $result .= "/>\n"; } $result .= "
 {'multichoice'} && !$checked) { + if ($checkedChoices{$choice->[1]}) { $result .= " checked "; - $checked = 1; } - $result .= "/> " . $choice->[0] . "
" . $choiceLabel . "
\n\n\n"; $result .= $buttons; @@ -917,15 +1222,14 @@ sub postprocess { my $self = shift; my $chosenValue = $ENV{'form.' . $self->{'variable'} . '.forminput'}; - if (!$chosenValue) { + if (!defined($chosenValue) && !$self->{'allowempty'}) { $self->{ERROR_MSG} = "You must choose one or more choices to" . " continue."; return 0; } - if ($self->{'multichoice'}) { - $self->process_multiple_choices($self->{'variable'}.'.forminput', - $self->{'variable'}); + if (ref($chosenValue)) { + $helper->{VARS}->{$self->{'variable'}} = join('|||', @$chosenValue); } if (defined($self->{NEXTSTATE})) { @@ -1168,7 +1472,13 @@ the user can manipulate the folders. takes the standard variable attribute to control what helper variable stores the results. It also takes a "multichoice" attribute, -which controls whether the user can select more then one resource. +which controls whether the user can select more then one resource. The +"toponly" attribute controls whether the resource display shows just the +resources in that sequence, or recurses into all sub-sequences, defaulting +to false. The "suppressEmptySequences" attribute reflects the +suppressEmptySequences argument to the render routine, which will cause +folders that have all of their contained resources filtered out to also +be filtered out. B @@ -1195,6 +1505,9 @@ B "}" returns a string representing what you want to have as the value. By default, the value will be the resource ID of the object ($res->{ID}). +=item * : If the URL of a map is given here, only that map + will be displayed, instead of the whole course. + =back =cut @@ -1206,7 +1519,8 @@ use strict; BEGIN { &Apache::lonhelper::register('Apache::lonhelper::resource', ('resource', 'filterfunc', - 'choicefunc', 'valuefunc')); + 'choicefunc', 'valuefunc', + 'mapurl')); } sub new { @@ -1224,6 +1538,9 @@ sub start_resource { $paramHash->{'variable'} = $token->[2]{'variable'}; $helper->declareVar($paramHash->{'variable'}); + $paramHash->{'multichoice'} = $token->[2]{'multichoice'}; + $paramHash->{'suppressEmptySequences'} = $token->[2]{'suppressEmptySequences'}; + $paramHash->{'toponly'} = $token->[2]{'toponly'}; return ''; } @@ -1291,6 +1608,20 @@ sub start_valuefunc { sub end_valuefunc { return ''; } +sub start_mapurl { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + my $contents = Apache::lonxml::get_all_text('/mapurl', + $parser); + $paramHash->{MAP_URL} = $contents; +} + +sub end_mapurl { return ''; } + # A note, in case I don't get to this before I leave. # If someone complains about the "Back" button returning them # to the previous folder state, instead of returning them to @@ -1309,13 +1640,40 @@ sub render { my $var = $self->{'variable'}; my $curVal = $helper->{VARS}->{$var}; + my $buttons = ''; + + if ($self->{'multichoice'}) { + $result = < + function checkall(value, checkName) { + for (i=0; i +SCRIPT + $buttons = <   + + +
  +BUTTONS + } + if (defined $self->{ERROR_MSG}) { - $result .= '' . $self->{ERROR_MSG} . '

'; + $result .= '
' . $self->{ERROR_MSG} . '

'; } + $result .= $buttons; + my $filterFunc = $self->{FILTER_FUNC}; my $choiceFunc = $self->{CHOICE_FUNC}; my $valueFunc = $self->{VALUE_FUNC}; + my $mapUrl = $self->{MAP_URL}; + my $multichoice = $self->{'multichoice'}; # Create the composite function that renders the column on the nav map # have to admit any language that lets me do this can't be all bad @@ -1323,12 +1681,16 @@ sub render { my $checked = 0; my $renderColFunc = sub { my ($resource, $part, $params) = @_; - + + my $inputType; + if ($multichoice) { $inputType = 'checkbox'; } + else {$inputType = 'radio'; } + if (!&$choiceFunc($resource)) { return ' '; } else { - my $col = "{'toponly'}; $result .= &Apache::lonnavmaps::render( { 'cols' => [$renderColFunc, Apache::lonnavmaps::resource()], 'showParts' => 0, - 'url' => $helper->{URL}, 'filterFunc' => $filterFunc, - 'resource_no_folder_link' => 1 } + 'resource_no_folder_link' => 1, + 'suppressEmptySequences' => $self->{'suppressEmptySequences'}, + 'iterator_map' => $mapUrl } ); + + $result .= $buttons; return $result; } sub postprocess { my $self = shift; + + if ($self->{'multichoice'} && !$helper->{VARS}->{$self->{'variable'}}) { + $self->{ERROR_MSG} = 'You must choose at least one resource to continue.'; + return 0; + } + if (defined($self->{NEXTSTATE})) { $helper->changeState($self->{NEXTSTATE}); } @@ -1404,6 +1775,10 @@ sub start_student { $paramHash->{'variable'} = $token->[2]{'variable'}; $helper->declareVar($paramHash->{'variable'}); $paramHash->{'multichoice'} = $token->[2]{'multichoice'}; + if (defined($token->[2]{'nextstate'})) { + $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'}; + } + } sub end_student { @@ -1419,21 +1794,25 @@ sub render { my $self = shift; my $result = ''; my $buttons = ''; + my $var = $self->{'variable'}; if ($self->{'multichoice'}) { $result = < - function checkall(value) { - for (i=0; i SCRIPT $buttons = < - - + +
BUTTONS } @@ -1444,7 +1823,6 @@ BUTTONS # Load up the students my $choices = &Apache::loncoursedata::get_classlist(); - my @keys = keys %{$choices}; # Constants @@ -1475,7 +1853,7 @@ BUTTONS $checked = 1; } $result .= - " value='" . HTML::Entities::encode($_) + " value='" . HTML::Entities::encode($_ . ':' . $choices->{$_}->[$section]) . "' />" . HTML::Entities::encode($choices->{$_}->[$fullname]) . "" @@ -1499,10 +1877,6 @@ sub postprocess { return 0; } - if ($self->{'multichoice'}) { - $self->process_multiple_choices($self->{'variable'}.'.forminput', - $self->{'variable'}); - } if (defined($self->{NEXTSTATE})) { $helper->changeState($self->{NEXTSTATE}); } @@ -1614,30 +1988,53 @@ sub render { my $var = $self->{'variable'}; my $subdirFunc = eval('sub {' . $self->{'filechoice'} . '}'); + die 'Error in resource filter code for variable ' . + {'variable'} . ', Perl said:' . $@ if $@; + my $subdir = &$subdirFunc(); my $filterFunc = $self->{FILTER_FUNC}; my $buttons = ''; + my $type = 'radio'; + if ($self->{'multichoice'}) { + $type = 'checkbox'; + } if ($self->{'multichoice'}) { $result = < - function checkall(value) { - for (i=0; i SCRIPT - my $buttons = <   - - + + +BUTTONS + + if ($helper->{VARS}->{'construction'}) { + $buttons .= < +
  BUTTONS + } } # Get the list of files in this directory. @@ -1659,15 +2056,11 @@ BUTTONS $result .= '
' . $self->{ERROR_MSG} . '

'; } - $result .= ''; + $result .= '
'; # Keeps track if there are no choices, prints appropriate error # if there are none. my $choices = 0; - my $type = 'radio'; - if ($self->{'multichoice'}) { - $type = 'checkbox'; - } # Print each legitimate file choice. for my $file (@fileList) { $file = (split(/&/, $file))[0]; @@ -1676,14 +2069,43 @@ BUTTONS } my $fileName = $subdir .'/'. $file; if (&$filterFunc($file)) { - $result .= '\n"; + $result .= "/>\n"; $choices++; } } @@ -1699,6 +2121,37 @@ BUTTONS return $result; } +# Determine the state of the file: Published, unpublished, modified. +# Return the color it should be in and a label as a two-element array +# reference. +# Logic lifted from lonpubdir.pm, even though I don't know that it's still +# the most right thing to do. + +sub fileState { + my $constructionSpaceDir = shift; + my $file = shift; + + my $docroot = $Apache::lonnet::perlvar{'lonDocRoot'}; + my $subdirpart = $constructionSpaceDir; + $subdirpart =~ s/^\/home\/$ENV{'user.name'}\/public_html//; + my $resdir = $docroot . '/res/' . $ENV{'user.domain'} . '/' . $ENV{'user.name'} . + $subdirpart; + + my @constructionSpaceFileStat = stat($constructionSpaceDir . '/' . $file); + my @resourceSpaceFileStat = stat($resdir . '/' . $file); + if (!@resourceSpaceFileStat) { + return ['Unpublished', '#FFCCCC']; + } + + my $constructionSpaceFileModified = $constructionSpaceFileStat[9]; + my $resourceSpaceFileModified = $resourceSpaceFileStat[9]; + + if ($constructionSpaceFileModified > $resourceSpaceFileModified) { + return ['Modified', '#FFFFCC']; + } + return ['Published', '#CCFFCC']; +} + sub postprocess { my $self = shift; my $result = $ENV{'form.' . $self->{'variable'} . '.forminput'}; @@ -1708,10 +2161,6 @@ sub postprocess { return 0; } - if ($self->{'multichoice'}) { - $self->process_multiple_choices($self->{'variable'}.'.forminput', - $self->{'variable'}); - } if (defined($self->{NEXTSTATE})) { $helper->changeState($self->{NEXTSTATE}); } @@ -1719,6 +2168,472 @@ sub postprocess { return 1; } +1; + +package Apache::lonhelper::section; + +=pod + +=head2 Element: section + +
allows the user to choose one or more sections from the current +course. + +It takes the standard attributes "variable", "multichoice", and +"nextstate", meaning what they do for most other elements. + +=cut + +no strict; +@ISA = ("Apache::lonhelper::choices"); +use strict; + +BEGIN { + &Apache::lonhelper::register('Apache::lonhelper::section', + ('section')); +} + +sub new { + my $ref = Apache::lonhelper::choices->new(); + bless($ref); +} + +sub start_section { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + $paramHash->{CHOICES} = []; + + $paramHash->{'variable'} = $token->[2]{'variable'}; + $helper->declareVar($paramHash->{'variable'}); + $paramHash->{'multichoice'} = $token->[2]{'multichoice'}; + if (defined($token->[2]{'nextstate'})) { + $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'}; + } + + # Populate the CHOICES element + my %choices; + + my $section = Apache::loncoursedata::CL_SECTION(); + my $classlist = Apache::loncoursedata::get_classlist(); + foreach (keys %$classlist) { + my $sectionName = $classlist->{$_}->[$section]; + if (!$sectionName) { + $choices{"No section assigned"} = ""; + } else { + $choices{$sectionName} = $sectionName; + } + } + + for my $sectionName (sort(keys(%choices))) { + + push @{$paramHash->{CHOICES}}, [$sectionName, $sectionName]; + } +} + +sub end_section { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + Apache::lonhelper::section->new(); +} +1; + +package Apache::lonhelper::general; + +=pod + +=head2 General-purpose tag: + +The contents of the exec tag are executed as Perl code, not inside a +safe space, so the full range of $ENV and such is available. The code +will be executed as a subroutine wrapped with the following code: + +"sub { my $helper = shift; my $state = shift;" and + +"}" + +The return value is ignored. + +$helper is the helper object. Feel free to add methods to the helper +object to support whatever manipulation you may need to do (for instance, +overriding the form location if the state is the final state; see +lonparm.helper for an example). + +$state is the $paramHash that has currently been generated and may +be manipulated by the code in exec. Note that the $state is not yet +an actual state B, it is just a hash, so do not expect to +be able to call methods on it. + +=cut + +BEGIN { + &Apache::lonhelper::register('Apache::lonhelper::general', + 'exec', 'condition', 'clause', + 'eval'); +} + +sub start_exec { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + my $code = &Apache::lonxml::get_all_text('/exec', $parser); + + $code = eval ('sub { my $helper = shift; my $state = shift; ' . + $code . "}"); + die 'Error in , Perl said: '. $@ if $@; + &$code($helper, $paramHash); +} + +sub end_exec { return ''; } + +=pod + +=head2 General-purpose tag: + +The tag allows you to mask out parts of the helper code +depending on some programatically determined condition. The condition +tag contains a tag which contains perl code that when wrapped +with "sub { my $helper = shift; my $state = shift; " and "}", returns +a true value if the XML in the condition should be evaluated as a normal +part of the helper, or false if it should be completely discarded. + +The tag must be the first sub-tag of the tag or +it will not work as expected. + +=cut + +# The condition tag just functions as a marker, it doesn't have +# to "do" anything. Technically it doesn't even have to be registered +# with the lonxml code, but I leave this here to be explicit about it. +sub start_condition { return ''; } +sub end_condition { return ''; } + +sub start_clause { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + my $clause = Apache::lonxml::get_all_text('/clause', $parser); + $clause = eval('sub { my $helper = shift; my $state = shift; ' + . $clause . '}'); + die 'Error in clause of condition, Perl said: ' . $@ if $@; + if (!&$clause($helper, $paramHash)) { + # Discard all text until the /condition. + &Apache::lonxml::get_all_text('/condition', $parser); + } +} + +sub end_clause { return ''; } + +=pod + +=head2 General-purpose tag: + +The tag will be evaluated as a subroutine call passed in the +current helper object and state hash as described in above, +but is expected to return a string to be printed directly to the +screen. This is useful for dynamically generating messages. + +=cut + +# This is basically a type of message. +# Programmatically setting $paramHash->{NEXTSTATE} would work, though +# it's probably bad form. + +sub start_eval { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + my $program = Apache::lonxml::get_all_text('/eval', $parser); + $program = eval('sub { my $helper = shift; my $state = shift; ' + . $program . '}'); + die 'Error in eval code, Perl said: ' . $@ if $@; + $paramHash->{MESSAGE_TEXT} = &$program($helper, $paramHash); +} + +sub end_eval { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + Apache::lonhelper::message->new(); +} + +1; + +package Apache::lonhelper::final; + +=pod + +=head2 Element: final + + is a special element that works with helpers that use the +tag. It goes through all the states and elements, executing the +snippets and collecting the results. Finally, it takes the user out of the +helper, going to a provided page. + +=cut + +no strict; +@ISA = ("Apache::lonhelper::element"); +use strict; + +BEGIN { + &Apache::lonhelper::register('Apache::lonhelper::final', + ('final', 'exitpage')); +} + +sub new { + my $ref = Apache::lonhelper::element->new(); + bless($ref); +} + +sub start_final { return ''; } + +sub end_final { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + Apache::lonhelper::final->new(); + + return ''; +} + +sub start_exitpage { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + + $paramHash->{EXIT_PAGE} = &Apache::lonxml::get_all_text('/exitpage', + $parser); + + return ''; +} + +sub end_exitpage { return ''; } + +sub render { + my $self = shift; + + my @results; + + # Collect all the results + for my $stateName (keys %{$helper->{STATES}}) { + my $state = $helper->{STATES}->{$stateName}; + + for my $element (@{$state->{ELEMENTS}}) { + if (defined($element->{FINAL_CODE})) { + # Compile the code. + my $code = 'sub { my $helper = shift; my $element = shift; ' + . $element->{FINAL_CODE} . '}'; + $code = eval($code); + die 'Error while executing final code for element with var ' . + $element->{'variable'} . ', Perl said: ' . $@ if $@; + + my $result = &$code($helper, $element); + if ($result) { + push @results, $result; + } + } + } + } + + if (scalar(@results) == 0) { + return ''; + } + + my $result = "
    \n"; + for my $re (@results) { + $result .= '
  • ' . $re . "
    • \n"; + } + return $result . '
'; +} + +1; + +package Apache::lonhelper::parmwizfinal; + +# This is the final state for the parmwizard. It is not generally useful, +# so it is not perldoc'ed. It does its own processing. +# It is represented with , and +# should later be moved to lonparmset.pm . + +no strict; +@ISA = ('Apache::lonhelper::element'); +use strict; + +BEGIN { + &Apache::lonhelper::register('Apache::lonhelper::parmwizfinal', + ('parmwizfinal')); +} + +use Time::localtime; + +sub new { + my $ref = Apache::lonhelper::choices->new(); + bless ($ref); +} + +sub start_parmwizfinal { return ''; } + +sub end_parmwizfinal { + my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; + + if ($target ne 'helper') { + return ''; + } + Apache::lonhelper::parmwizfinal->new(); +} + +# Renders a form that, when submitted, will form the input to lonparmset.pm +sub render { + my $self = shift; + my $vars = $helper->{VARS}; + + # FIXME: Unify my designators with the standard ones + my %dateTypeHash = ('open_date' => "Opening Date", + 'due_date' => "Due Date", + 'answer_date' => "Answer Date"); + my %parmTypeHash = ('open_date' => "0_opendate", + 'due_date' => "0_duedate", + 'answer_date' => "0_answerdate"); + + my $affectedResourceId = ""; + my $parm_name = $parmTypeHash{$vars->{ACTION_TYPE}}; + my $level = ""; + my $resourceString; + my $symb; + my $paramlevel; + + # Print the granularity, depending on the action + if ($vars->{GRANULARITY} eq 'whole_course') { + $resourceString .= '
  • for all resources in the course
    • '; + $level = 9; # general course, see lonparmset.pm perldoc + $affectedResourceId = "0.0"; + $symb = 'a'; + $paramlevel = 'general'; + } elsif ($vars->{GRANULARITY} eq 'map') { + my $navmap = Apache::lonnavmaps::navmap->new( + $ENV{"request.course.fn"}.".db", + $ENV{"request.course.fn"}."_parms.db", 0, 0); + my $res = $navmap->getById($vars->{RESOURCE_ID}); + my $title = $res->compTitle(); + $symb = $res->symb(); + $navmap->untieHashes(); + $resourceString .= "
  • for the map named $title
    • "; + $level = 8; + $affectedResourceId = $vars->{RESOURCE_ID}; + $paramlevel = 'map'; + } else { + my $navmap = Apache::lonnavmaps::navmap->new( + $ENV{"request.course.fn"}.".db", + $ENV{"request.course.fn"}."_parms.db", 0, 0); + my $res = $navmap->getById($vars->{RESOURCE_ID}); + $symb = $res->symb(); + my $title = $res->compTitle(); + $navmap->untieHashes(); + $resourceString .= "
  • for the resource named $title
    • "; + $level = 7; + $affectedResourceId = $vars->{RESOURCE_ID}; + $paramlevel = 'full'; + } + + my $result = "\n"; + $result .= '

    Confirm that this information is correct, then click "Finish Wizard" to complete setting the parameter.

      '; + + # Print the type of manipulation: + $result .= '
    • Setting the ' . $dateTypeHash{$vars->{ACTION_TYPE}} + . "
      • \n"; + if ($vars->{ACTION_TYPE} eq 'due_date' || + $vars->{ACTION_TYPE} eq 'answer_date') { + # for due dates, we default to "date end" type entries + $result .= "\n"; + $result .= "\n"; + $result .= "\n"; + } elsif ($vars->{ACTION_TYPE} eq 'open_date') { + $result .= "\n"; + $result .= "\n"; + $result .= "\n"; + } + + $result .= $resourceString; + + # Print targets + if ($vars->{TARGETS} eq 'course') { + $result .= '
    • for all students in course
      • '; + } elsif ($vars->{TARGETS} eq 'section') { + my $section = $vars->{SECTION_NAME}; + $result .= "
    • for section $section
      • "; + $level -= 3; + $result .= "\n"; + } else { + # FIXME: This is probably wasteful! Store the name! + my $classlist = Apache::loncoursedata::get_classlist(); + my $username = $vars->{USER_NAME}; + # Chop off everything after the last colon (section) + $username = substr($username, 0, rindex($username, ':')); + my $name = $classlist->{$username}->[6]; + $result .= "
    • for $name
      • "; + $level -= 6; + my ($uname, $udom) = split /:/, $vars->{USER_NAME}; + $result .= "\n"; + $result .= "\n"; + } + + # Print value + $result .= "
    • to " . ctime($vars->{PARM_DATE}) . " (" . + Apache::lonnavmaps::timeToHumanString($vars->{PARM_DATE}) + . ")
      • \n"; + + # print pres_marker + $result .= "\n\n"; + + # Make the table appear + $result .= "\n"; + $result .= "\n"; + $result .= "\n"; + $result .= "\n"; + + $result .= "

      \n"; + + return $result; +} + +sub overrideForm { + return 1; +} + 1; __END__
    ' . - "{VARS}->{'construction'}) { + $onclick = 'onclick="a=1" '; + } + $result .= '
    " . + "{'multichoice'} && $choices == 0) { $result .= ' checked'; } - $result .= "/>" . $file . "
    " . $file . + "$status