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Revision 3765 - (download) (as text) (annotate)
Thu Nov 17 22:57:39 2005 UTC (14 years, 3 months ago) by dpvc
File size: 20469 byte(s)
Handle the new global.conf setting for jsMath's processDoubleClicks option.

    1 # This file provided the fundamental macros for the pg language
    2 # These macros define the interface between the problems written by
    3 # the professor and the processing which occurs in the script
    4 # processProblem.pl
    5 
    6 
    7 BEGIN {
    8   be_strict();
    9 }
   10 
   11 sub _PG_init{
   12 
   13 }
   14 
   15 #package PG;
   16 
   17 
   18 =head1 NAME
   19 
   20   PG.pl --- located in the courseScripts directory.
   21   Defines the Program Generating language at the most basic level.
   22 
   23 =head1 SYNPOSIS
   24 
   25   The basic PG problem structure:
   26 
   27   DOCUMENT();          # should be the first statment in the problem
   28   loadMacros(.....);   # (optional) load other macro files if needed.
   29                        # (loadMacros is defined in F<dangerousMacros.pl>)
   30 
   31   HEADER_TEXT(...);    # (optional) used only for inserting javaScript into problems.
   32 
   33   #            #  insert text of problems
   34   TEXT("Problem text to be",
   35        "displayed. Enter 1 in this blank:",
   36        ANS_RULE(1,30)  #  ANS_RULE() defines an answer blank 30 characters long.
   37                        #  It is defined in F<PGbasicmacros.pl>
   38        );
   39 
   40 
   41   ANS( answer_evalutors);  # see F<PGanswermacros.pl> for examples of answer evaluatiors.
   42 
   43   ENDDOCUMENT()        # must be the last statement in the problem
   44 
   45 
   46 
   47 =head1 DESCRIPTION
   48 
   49 As described in the synopsis, this file and the macros C<DOCUMENT()> and C<ENDDOCUMENT()> determine
   50 the interface between problems written in the PG language and the rest of B<WeBWorK>, in particular
   51 the subroutine C<createPGtext(()> in the file F<translate.pl>.
   52 
   53 C<DOCUMENT()> must be the first statement in each problem template.
   54 It  initializes variables,
   55 in particular all of the contents of the
   56 environment variable  become defined in the problem enviroment.
   57 (See
   58 L</webwork_system_html/docs/techdescription/pglanguage/PGenvironment.html>)
   59 
   60 ENDDOCUMENT() must the last executable statement in any problem template.  It returns
   61 the rendered problem, answer evaluators and other flags to the rest of B<WeBWorK>, specificially
   62 to the routine C<createPGtext()> defined in F<translate.pl>
   63 
   64 
   65 The C<HEADER_TEXT()>, C<TEXT()>, and C<ANS()> functions load the
   66 header text string, the problem text string.
   67 and the answer evaulator queue respectively.
   68 
   69 
   70 =cut
   71 
   72 
   73 #  Private variables for the PG.pl file.
   74 
   75 my ($STRINGforOUTPUT, $STRINGforHEADER_TEXT, @PG_ANSWERS, @PG_UNLABELED_ANSWERS);
   76 my %PG_ANSWERS_HASH ;
   77 our $PG_STOP_FLAG;
   78 
   79 # my variables are unreliable if two DOCUMENTS were to be called before an ENDDOCUMENT
   80 # there could be conflicts.  As I understand the behavior of the Apache child
   81 # this cannot occur -- a child finishes with one request before obtaining the next
   82 
   83 #   DOCUMENT must come early in every .pg file, before any answers or text are
   84 # defined.  It initializes the variables.
   85 # It can appear only once.
   86 
   87 =head2 DOCUMENT()
   88 
   89 C<DOCUMENT()> must be the first statement in each problem template.  It can
   90 only be used once in each problem.
   91 
   92 C<DOCUMENT()> initializes some empty variables and via C<INITIALIZE_PG()> unpacks the
   93 variables in the C<%envir> variable which is implicitly passed to the problem. It must
   94 be the first statement in any problem template. It
   95 also unpacks any answers submitted and places them in the C<@submittedAnswer> list,
   96 saves the problem seed in C<$PG_original_problemSeed> in case you need it later, and
   97 initializes the pseudo random number generator object in C<$PG_random_generator>.
   98 
   99 You can reset the standard number generator using the command:
  100 
  101   $PG_random_generator->srand($new_seed_value);
  102 
  103 (See also C<SRAND> in the L<PGbasicmacros.pl> file.)
  104 
  105 The
  106 environment variable contents is defined in
  107 L</webwork_system_html/docs/techdescription/pglanguage/PGenvironment.html>
  108 
  109 
  110 =cut
  111 
  112 sub DOCUMENT {
  113 
  114   $STRINGforOUTPUT ="";
  115     $STRINGforHEADER_TEXT ="";
  116   @PG_ANSWERS=();
  117   $PG_STOP_FLAG=0;
  118   @PG_UNLABELED_ANSWERS = ();
  119   %PG_ANSWERS_HASH = ();
  120   # FIXME:  We are initializing these variables into both Safe::Root1 (the cached safe compartment)
  121   # and Safe::Root2 (the current one)
  122   # There is a good chance they won't be properly updated in one or the other of these compartments.
  123 
  124 #   @main::PG_ANSWER_ENTRY_ORDER = ();
  125 #   $main::ANSWER_PREFIX = 'AnSwEr';
  126 #   %main::PG_FLAGS=();  #global flags
  127 #   $main::showPartialCorrectAnswers = 0 unless defined($main::showPartialCorrectAnswers );
  128 #   $main::showHint = 1 unless defined($main::showHint);
  129 #   $main::solutionExists =0;
  130 #   $main::hintExists =0;
  131 #   %main::gifs_created = ();
  132   eval(q!
  133   @main::PG_ANSWER_ENTRY_ORDER = ();
  134   $main::ANSWER_PREFIX = 'AnSwEr';
  135   %main::PG_FLAGS=();  #global flags
  136   $main::showPartialCorrectAnswers = 0 unless defined($main::showPartialCorrectAnswers );
  137   $main::showHint = 1 unless defined($main::showHint);
  138   $main::solutionExists =0;
  139   $main::hintExists =0;
  140   $main::pgComment = '';
  141   %main::gifs_created = ();
  142 
  143     !);
  144 #    warn eval(q! "PG.pl:  The envir variable $main::{envir} is".join(" ",%main::envir)!);
  145     my $rh_envir = eval(q!\%main::envir!);
  146     my %envir    = %$rh_envir;
  147 
  148     # Save the file name for use in error messages
  149     my ($callpkg,$callfile) = caller(0);
  150     $envir{__files__}{$callfile} = $envir{templateDirectory}.$envir{fileName};
  151 
  152     #no strict;
  153     foreach  my  $var (keys %envir) {
  154       eval(q!$main::!.$var.q! = $main::envir{!.$var.q!}! );  #whew!! makes sure $var is interpolated but $main:: is evaluated at run time.
  155     #    warn eval(q! "var $var is defined ". $main::!.$var);
  156         warn "Problem defining ", q{\$main::}.$var, " while initializing the PG problem: $@" if $@;
  157     }
  158     #use strict;
  159     #FIXME these strict pragmas don't seem to be needed and they cause trouble in perl 5.6.0
  160 
  161 
  162 
  163     eval(q!
  164   @main::submittedAnswers = @{$main::refSubmittedAnswers} if defined($main::refSubmittedAnswers);
  165   $main::PG_original_problemSeed = $main::problemSeed;
  166   $main::PG_random_generator = new PGrandom($main::problemSeed) || die "Can't create random number generator.";
  167   $main::ans_rule_count = 0;  # counts questions
  168 
  169     # end unpacking of environment variables.
  170     $main::QUIZ_PREFIX = '' unless defined($main::QUIZ_PREFIX)
  171 
  172   !);
  173 #   @main::submittedAnswers = @{$main::refSubmittedAnswers} if defined($main::refSubmittedAnswers);
  174 #   $main::PG_original_problemSeed = $main::problemSeed;
  175 #   $main::PG_random_generator = new PGrandom($main::problemSeed) || die "Can't create random number generator.";
  176 #   $main::ans_rule_count = 0;  # counts questions
  177 
  178     # end unpacking of environment variables.
  179 #   $main::QUIZ_PREFIX = '' unless defined($main::QUIZ_PREFIX)
  180 
  181   if ($main::envir{displayMode} eq 'HTML_jsMath') {
  182     my $prefix = "";
  183     if (!$main::envir{jsMath}{reportMissingFonts}) {
  184       $prefix .= '<SCRIPT>noFontMessage = 1</SCRIPT>'."\n";
  185     } elsif ($main::envir{jsMath}{missingFontMessage}) {
  186       $prefix .= '<SCRIPT>missingFontMessage = "'.$main::envir{jsMath}{missingFontMessage}.'"</SCRIPT>'."\n";
  187     }
  188     $prefix .= '<SCRIPT>processDoubleClicks = '.($main::envir{jsMath}{processDoubleClicks}?'1':'0')."</SCRIPT>\n";
  189     $STRINGforOUTPUT =
  190       $prefix .
  191       '<SCRIPT SRC="'.$main::envir{jsMathURL}.'"></SCRIPT>' . "\n" .
  192       '<NOSCRIPT><CENTER><FONT COLOR="#CC0000">' .
  193       '<B>Warning: the mathematics on this page requires JavaScript.<BR>' .
  194       'If your browser supports it, be sure it is enabled.</B>'.
  195       '</FONT></CENTER><p></NOSCRIPT>' .
  196       $STRINGforOUTPUT;
  197     $STRINGforOUTPUT .=
  198       '<SCRIPT>jsMath.Setup.Script("plugins/noImageFonts.js")</SCRIPT>'
  199         if ($main::envir{jsMath}{noImageFonts});
  200   }
  201 
  202   $STRINGforOUTPUT = '<SCRIPT SRC="'.$main::envir{asciimathURL}.'"></SCRIPT>' . "\n" .
  203                            '<SCRIPT>mathcolor = "black"</SCRIPT>' . $STRINGforOUTPUT
  204     if ($main::envir{displayMode} eq 'HTML_asciimath');
  205 
  206 }
  207 
  208 sub inc_ans_rule_count {
  209   eval(q!++$main::ans_rule_count!); # evalute at runtime to get correct main::
  210 }
  211 # HEADER_TEXT is for material which is destined to be placed in the header of the html problem -- such
  212 #   as javaScript code.
  213 
  214 =head2 HEADER_TEXT()
  215 
  216 
  217   HEADER_TEXT("string1", "string2", "string3");
  218 
  219 The C<HEADER_TEXT()>
  220 function concatenates its arguments and places them in the output
  221 header text string.  It is used for material which is destined to be placed in
  222 the header of the html problem -- such as javaScript code.
  223  It can be used more than once in a file.
  224 
  225 
  226 =cut
  227 
  228 sub HEADER_TEXT {
  229   my @in = @_;
  230   $STRINGforHEADER_TEXT .= join(" ",@in);
  231   }
  232 
  233 # TEXT is the function which defines text which will appear in the problem.
  234 # All text must be an argument to this function.  Any other statements
  235 #   are calculations (done in perl) which will not directly appear in the
  236 # output.  Think of this as the "print" function for the .pg language.
  237 # It can be used more than once in a file.
  238 
  239 =head2 TEXT()
  240 
  241   TEXT("string1", "string2", "string3");
  242 
  243 The C<TEXT()> function concatenates its arguments and places them in the output
  244 text string. C<TEXT()> is the function which defines text which will appear in the problem.
  245 All text must be an argument to this function.  Any other statements
  246 are calculations (done in perl) which will not directly appear in the
  247 output.  Think of this as the "print" function for the .pg language.
  248 It can be used more than once in a file.
  249 
  250 =cut
  251 
  252 sub TEXT {
  253   return "" if $PG_STOP_FLAG;
  254   my @in = @_;
  255   $STRINGforOUTPUT .= join(" ",@in);
  256 }
  257 
  258 =head2 STOP_RENDERING()
  259 
  260   STOP_RENDERING() unless all_answers_are_correct;
  261 
  262 No text is printed and no answer blanks or answer evaluators are stored or processed until
  263 RESUME_RENDERING() is executed.
  264 
  265 =cut
  266 
  267 sub STOP_RENDERING {
  268   $PG_STOP_FLAG=1;
  269   "";
  270 }
  271 
  272 =head2 RESUME_RENDERING()
  273 
  274   RESUME_RENDERING();
  275 
  276 Resumes processing of text,  answer blanks,  and
  277 answer evaluators.
  278 
  279 =cut
  280 
  281 sub RESUME_RENDERING {
  282   $PG_STOP_FLAG=0;
  283   "";
  284 }
  285 
  286 =head2 ANS()
  287 
  288   ANS(answer_evaluator1, answer_evaluator2, answer_evaluator3,...)
  289 
  290 Places the answer evaluators in the unlabeled answer_evaluator queue.  They will be paired
  291 with unlabeled answer rules (answer entry blanks) in the order entered.  This is the standard
  292 method for entering answers.
  293 
  294   LABELED_ANS(answer_evaluater_name1, answer_evaluator1, answer_evaluater_name2,answer_evaluator2,...)
  295 
  296 Places the answer evaluators in the labeled answer_evaluator hash.  This allows pairing of
  297 labeled answer evaluators and labeled answer rules which may not have been entered in the same
  298 order.
  299 
  300 =cut
  301 
  302 sub ANS{             # store answer evaluators which have not been explicitly labeled
  303   return "" if $PG_STOP_FLAG;
  304   my @in = @_;
  305   while (@in ) {
  306          warn("<BR><B>Error in ANS:$in[0]</B> -- inputs must be references to
  307                       subroutines<BR>")
  308       unless ref($in[0]);
  309       push(@PG_ANSWERS, shift @in );
  310   }
  311 }
  312 sub LABELED_ANS {  #a better alias for NAMED_ANS
  313   &NAMED_ANS;
  314 }
  315 
  316 sub NAMED_ANS{     # store answer evaluators which have been explicitly labeled (submitted in a hash)
  317   return "" if $PG_STOP_FLAG;
  318   my @in = @_;
  319   while (@in ) {
  320     my $label = shift @in;
  321     $label = eval(q!$main::QUIZ_PREFIX.$label!);
  322     my $ans_eval = shift @in;
  323     TEXT("<BR><B>Error in NAMED_ANS:$in[0]</B>
  324           -- inputs must be references to subroutines<BR>")
  325       unless ref($ans_eval);
  326     $PG_ANSWERS_HASH{$label}= $ans_eval;
  327   }
  328 }
  329 sub RECORD_ANS_NAME {     # this maintains the order in which the answer rules are printed.
  330     return "" if $PG_STOP_FLAG;
  331   my $label = shift;
  332   eval(q!push(@main::PG_ANSWER_ENTRY_ORDER, $label)!);
  333   $label;
  334 }
  335 
  336 sub NEW_ANS_NAME {        # this keeps track of the answers which are entered implicitly,
  337                           # rather than with a specific label
  338         return "" if $PG_STOP_FLAG;
  339     my $number=shift;
  340     my $prefix = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!);
  341     my $label = $prefix.$number;
  342     push(@PG_UNLABELED_ANSWERS,$label);
  343     $label;
  344 }
  345 sub ANS_NUM_TO_NAME {     # This converts a number to an answer label for use in
  346                           # radio button and check box answers. No new answer
  347                           # name is recorded.
  348     my $number=shift;
  349     my $label = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!).$number;
  350     $label;
  351 }
  352 
  353 my $vecnum;
  354 
  355 sub RECORD_FORM_LABEL  {             # this stores form data (such as sticky answers), but does nothing more
  356                                      # it's a bit of hack since we are storing these in the KEPT_EXTRA_ANSWERS queue even if they aren't answers per se.
  357   return "" if $PG_STOP_FLAG;
  358   my $label   = shift;             # the label of the input box or textarea
  359     eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!); #put the labels into the hash to be caught later for recording purposes
  360     $label;
  361 }
  362 sub NEW_ANS_ARRAY_NAME {        # this keeps track of the answers which are entered implicitly,
  363                           # rather than with a specific label
  364         return "" if $PG_STOP_FLAG;
  365     my $number=shift;
  366     $vecnum = 0;
  367     my $row = shift;
  368     my $col = shift;
  369 #   my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
  370     my $label = "ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__";
  371     push(@PG_UNLABELED_ANSWERS,$label);
  372     $label;
  373 }
  374 
  375 sub NEW_ANS_ARRAY_NAME_EXTENSION {        # this keeps track of the answers which are entered implicitly,
  376                                           # rather than with a specific label
  377         return "" if $PG_STOP_FLAG;
  378     my $number=shift;
  379     my $row = shift;
  380     my $col = shift;
  381     if( $row == 0 && $col == 0 ){
  382       $vecnum += 1;
  383     }
  384     #FIXME   change made to conform to HTML 4.01 standards.  "Name" attributes can only contain
  385     # alphanumeric characters,   _ : and .
  386     # Also need to make corresponding changes in PGmorematrixmacros.  grep for ArRaY.
  387     #my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
  388     my $label = "ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__";
  389     eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!);#put the labels into the hash to be caught later for recording purposes
  390     $label;
  391 }
  392 
  393 
  394 sub get_PG_ANSWERS_HASH {
  395   # update the PG_ANSWWERS_HASH, then report the result.
  396   # This is used in writing sequential problems
  397   # if there is an input, use that as a key into the answer hash
  398   my $key = shift;
  399   my (%pg_answers_hash, @pg_unlabeled_answers);
  400   %pg_answers_hash= %PG_ANSWERS_HASH;
  401   #warn "order ", eval(q!@main::PG_ANSWER_ENTRY_ORDER!);
  402   #warn "pg answers", %PG_ANSWERS_HASH;
  403   #warn "unlabeled", @PG_UNLABELED_ANSWERS;
  404     my $index=0;
  405     foreach my $label (@PG_UNLABELED_ANSWERS) {
  406         if ( defined($PG_ANSWERS[$index]) ) {
  407         $pg_answers_hash{"$label"}= $PG_ANSWERS[$index];
  408       #warn "recording answer label = $label";
  409       } else {
  410         warn "No answer provided by instructor for answer $label";
  411       }
  412       $index++;
  413     }
  414     if ($key) {
  415       return $pg_answers_hash{$key};
  416     } else {
  417       return %pg_answers_hash;
  418     }
  419 }
  420 # ENDDOCUMENT must come at the end of every .pg file.
  421 #   It exports the resulting text of the problem, the text to be used in HTML header material
  422 #   (for javaScript), the list of answer evaluators and any other flags.  It can appear only once and
  423 #   it MUST be the last statement in the problem.
  424 
  425 =head2 ENDDOCUMENT()
  426 
  427 ENDDOCUMENT() must the last executable statement in any problem template.  It can
  428 only appear once.  It returns
  429 an array consisting of
  430 
  431   A reference to a string containing the rendered text of the problem.
  432   A reference to a string containing text to be placed in the header
  433                (for javaScript)
  434   A reference to the array containing the answer evaluators.
  435                (May be changed to a hash soon.)
  436   A reference to an associative array (hash) containing various flags.
  437 
  438   The following flags are set by ENDDOCUMENT:
  439   (1) showPartialCorrectAnswers  -- determines whether students are told which
  440       of their answers in a problem are wrong.
  441   (2) recordSubmittedAnswers  -- determines whether students submitted answers
  442       are saved.
  443   (3) refreshCachedImages  -- determines whether the cached image of the problem
  444       in typeset mode is always refreshed (i.e. setting this to 1 means cached
  445       images are not used).
  446   (4) solutionExits   -- indicates the existence of a solution.
  447   (5) hintExits   -- indicates the existence of a hint.
  448   (6) comment   -- contents of COMMENT commands if any.
  449   (7) showHintLimit -- determines the number of attempts after which hint(s) will be shown
  450 
  451   (8) PROBLEM_GRADER_TO_USE -- chooses the problem grader to be used in this order
  452     (a) A problem grader specified by the problem using:
  453         install_problem_grader(\&grader);
  454     (b) One of the standard problem graders defined in PGanswermacros.pl when set to
  455         'std_problem_grader' or 'avg_problem_grader' by the environment variable
  456         $PG_environment{PROBLEM_GRADER_TO_USE}
  457     (c) A subroutine referenced by $PG_environment{PROBLEM_GRADER_TO_USE}
  458     (d) The default &std_problem_grader defined in PGanswermacros.pl
  459 
  460 
  461 =cut
  462 
  463 sub ENDDOCUMENT {
  464 
  465     my $index=0;
  466     foreach my $label (@PG_UNLABELED_ANSWERS) {
  467         if ( defined($PG_ANSWERS[$index]) ) {
  468         $PG_ANSWERS_HASH{"$label"}= $PG_ANSWERS[$index];
  469       #warn "recording answer label = $label";
  470       } else {
  471         warn "No answer provided by instructor for answer $label";
  472       }
  473       $index++;
  474     }
  475 
  476     $STRINGforOUTPUT .="\n";
  477    eval q{  #make sure that "main" points to the current safe compartment by evaluating these lines.
  478     $main::PG_FLAGS{'showPartialCorrectAnswers'} = $main::showPartialCorrectAnswers;
  479     $main::PG_FLAGS{'recordSubmittedAnswers'} = $main::recordSubmittedAnswers;
  480     $main::PG_FLAGS{'refreshCachedImages'} = $main::refreshCachedImages;
  481     $main::PG_FLAGS{'comment'} = $main::pgComment;
  482     $main::PG_FLAGS{'hintExists'} = $main::hintExists;
  483     $main::PG_FLAGS{'showHintLimit'} = $main::showHint;
  484     $main::PG_FLAGS{'solutionExists'} = $main::solutionExists;
  485     $main::PG_FLAGS{ANSWER_ENTRY_ORDER} = \@main::PG_ANSWER_ENTRY_ORDER;
  486     $main::PG_FLAGS{KEPT_EXTRA_ANSWERS} = \@main::KEPT_EXTRA_ANSWERS;##need to keep array labels that don't call "RECORD_ANS_NAME"
  487     $main::PG_FLAGS{ANSWER_PREFIX} = $main::ANSWER_PREFIX;
  488     # install problem grader
  489     if (defined($main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) ) {
  490       # problem grader defined within problem -- no further action needed
  491     } elsif ( defined( $main::envir{PROBLEM_GRADER_TO_USE} ) ) {
  492       if (ref($main::envir{PROBLEM_GRADER_TO_USE}) eq 'CODE' ) {         # user defined grader
  493         $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = $main::envir{PROBLEM_GRADER_TO_USE};
  494       } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'std_problem_grader' ) {
  495         if (defined(&std_problem_grader) ){
  496           $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
  497         } # std_problem_grader is the default in any case so don't give a warning.
  498       } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'avg_problem_grader' ) {
  499         if (defined(&avg_problem_grader) ){
  500           $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&avg_problem_grader; # defined in PGanswermacros.pl
  501         }
  502         #else { # avg_problem_grader will be installed by PGtranslator so there is no need for a warning.
  503         # warn "The problem grader 'avg_problem_grader' has not been defined.  Has PGanswermacros.pl been loaded?";
  504         #}
  505       } else {
  506         warn "Error:  $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} is not a known program grader.";
  507       }
  508     } elsif (defined(&std_problem_grader)) {
  509       $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
  510     } else {
  511       # PGtranslator will install its default problem grader
  512     }
  513 
  514     warn "ERROR: The problem grader is not a subroutine" unless ref( $main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) eq 'CODE'
  515                      or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'std_problem_grader'
  516                      or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'avg_problem_grader';
  517      # return results
  518     };
  519 
  520     $STRINGforOUTPUT .= '<SCRIPT> jsMath.wwProcess() </SCRIPT>'
  521       if ($main::envir{displayMode} eq 'HTML_jsMath');
  522 
  523     if ($main::envir{displayMode} eq 'HTML_asciimath') {
  524       $STRINGforOUTPUT .= '<SCRIPT> translate() </SCRIPT>';
  525       $STRINGforHEADER_TEXT .=
  526         '<object id="mathplayer" classid="clsid:32F66A20-7614-11D4-BD11-00104BD3F987">' . "\n" .
  527         '</object><?import namespace="mml" implementation="#mathplayer"?>'
  528   unless ($STRINGforHEADER_TEXT =~ m/mathplayer/);
  529     }
  530   $STRINGforOUTPUT .= MODES(%{PG_restricted_eval('$main::problemPostamble')});
  531 
  532   (\$STRINGforOUTPUT, \$STRINGforHEADER_TEXT,\%PG_ANSWERS_HASH,eval(q!\%main::PG_FLAGS!));
  533 }
  534 
  535 
  536 
  537 =head2 INITIALIZE_PG()
  538 
  539 This is executed each C<DOCUMENT()> is called.  For backward compatibility
  540 C<loadMacros> also checks whether the C<macroDirectory> has been defined
  541 and if not, it runs C<INITIALIZE_PG()> and issues a warning.
  542 
  543 =cut
  544 
  545 
  546 1;

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