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Revision 4887 - (download) (as text) (annotate)
Thu Mar 15 22:08:55 2007 UTC (12 years, 10 months ago) by glarose
File size: 20685 byte(s)
Update quiz prefix for arrays.  This is not a complete fix, but it
gets incrementally closer to a fix.

    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   $STRINGforOUTPUT = '<SCRIPT SRC="'.$main::envir{LaTeXMathMLURL}.'"></SCRIPT>'."\n" . $STRINGforOUTPUT
  207     if ($main::envir{displayMode} eq 'HTML_LaTeXMathML');
  208 
  209 }
  210 
  211 sub inc_ans_rule_count {
  212   eval(q!++$main::ans_rule_count!); # evalute at runtime to get correct main::
  213 }
  214 # HEADER_TEXT is for material which is destined to be placed in the header of the html problem -- such
  215 #   as javaScript code.
  216 
  217 =head2 HEADER_TEXT()
  218 
  219 
  220   HEADER_TEXT("string1", "string2", "string3");
  221 
  222 The C<HEADER_TEXT()>
  223 function concatenates its arguments and places them in the output
  224 header text string.  It is used for material which is destined to be placed in
  225 the header of the html problem -- such as javaScript code.
  226  It can be used more than once in a file.
  227 
  228 
  229 =cut
  230 
  231 sub HEADER_TEXT {
  232   my @in = @_;
  233   $STRINGforHEADER_TEXT .= join(" ",@in);
  234   }
  235 
  236 # TEXT is the function which defines text which will appear in the problem.
  237 # All text must be an argument to this function.  Any other statements
  238 #   are calculations (done in perl) which will not directly appear in the
  239 # output.  Think of this as the "print" function for the .pg language.
  240 # It can be used more than once in a file.
  241 
  242 =head2 TEXT()
  243 
  244   TEXT("string1", "string2", "string3");
  245 
  246 The C<TEXT()> function concatenates its arguments and places them in the output
  247 text string. C<TEXT()> is the function which defines text which will appear in the problem.
  248 All text must be an argument to this function.  Any other statements
  249 are calculations (done in perl) which will not directly appear in the
  250 output.  Think of this as the "print" function for the .pg language.
  251 It can be used more than once in a file.
  252 
  253 =cut
  254 
  255 sub TEXT {
  256   return "" if $PG_STOP_FLAG;
  257   my @in = @_;
  258   $STRINGforOUTPUT .= join(" ",@in);
  259 }
  260 
  261 =head2 STOP_RENDERING()
  262 
  263   STOP_RENDERING() unless all_answers_are_correct;
  264 
  265 No text is printed and no answer blanks or answer evaluators are stored or processed until
  266 RESUME_RENDERING() is executed.
  267 
  268 =cut
  269 
  270 sub STOP_RENDERING {
  271   $PG_STOP_FLAG=1;
  272   "";
  273 }
  274 
  275 =head2 RESUME_RENDERING()
  276 
  277   RESUME_RENDERING();
  278 
  279 Resumes processing of text,  answer blanks,  and
  280 answer evaluators.
  281 
  282 =cut
  283 
  284 sub RESUME_RENDERING {
  285   $PG_STOP_FLAG=0;
  286   "";
  287 }
  288 
  289 =head2 ANS()
  290 
  291   ANS(answer_evaluator1, answer_evaluator2, answer_evaluator3,...)
  292 
  293 Places the answer evaluators in the unlabeled answer_evaluator queue.  They will be paired
  294 with unlabeled answer rules (answer entry blanks) in the order entered.  This is the standard
  295 method for entering answers.
  296 
  297   LABELED_ANS(answer_evaluater_name1, answer_evaluator1, answer_evaluater_name2,answer_evaluator2,...)
  298 
  299 Places the answer evaluators in the labeled answer_evaluator hash.  This allows pairing of
  300 labeled answer evaluators and labeled answer rules which may not have been entered in the same
  301 order.
  302 
  303 =cut
  304 
  305 sub ANS{             # store answer evaluators which have not been explicitly labeled
  306   return "" if $PG_STOP_FLAG;
  307   my @in = @_;
  308   while (@in ) {
  309          warn("<BR><B>Error in ANS:$in[0]</B> -- inputs must be references to
  310                       subroutines<BR>")
  311       unless ref($in[0]);
  312       push(@PG_ANSWERS, shift @in );
  313   }
  314 }
  315 sub LABELED_ANS {  #a better alias for NAMED_ANS
  316   &NAMED_ANS;
  317 }
  318 
  319 sub NAMED_ANS{     # store answer evaluators which have been explicitly labeled (submitted in a hash)
  320   return "" if $PG_STOP_FLAG;
  321   my @in = @_;
  322   while (@in ) {
  323     my $label = shift @in;
  324     $label = eval(q!$main::QUIZ_PREFIX.$label!);
  325     my $ans_eval = shift @in;
  326     TEXT("<BR><B>Error in NAMED_ANS:$in[0]</B>
  327           -- inputs must be references to subroutines<BR>")
  328       unless ref($ans_eval);
  329     $PG_ANSWERS_HASH{$label}= $ans_eval;
  330   }
  331 }
  332 sub RECORD_ANS_NAME {     # this maintains the order in which the answer rules are printed.
  333     return "" if $PG_STOP_FLAG;
  334   my $label = shift;
  335   eval(q!push(@main::PG_ANSWER_ENTRY_ORDER, $label)!);
  336   $label;
  337 }
  338 
  339 sub NEW_ANS_NAME {        # this keeps track of the answers which are entered implicitly,
  340                           # rather than with a specific label
  341         return "" if $PG_STOP_FLAG;
  342     my $number=shift;
  343     my $prefix = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!);
  344     my $label = $prefix.$number;
  345     push(@PG_UNLABELED_ANSWERS,$label);
  346     $label;
  347 }
  348 sub ANS_NUM_TO_NAME {     # This converts a number to an answer label for use in
  349                           # radio button and check box answers. No new answer
  350                           # name is recorded.
  351     my $number=shift;
  352     my $label = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!).$number;
  353     $label;
  354 }
  355 
  356 my $vecnum;
  357 
  358 sub RECORD_FORM_LABEL  {             # this stores form data (such as sticky answers), but does nothing more
  359                                      # 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.
  360   return "" if $PG_STOP_FLAG;
  361   my $label   = shift;             # the label of the input box or textarea
  362     eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!); #put the labels into the hash to be caught later for recording purposes
  363     $label;
  364 }
  365 sub NEW_ANS_ARRAY_NAME {        # this keeps track of the answers which are entered implicitly,
  366                           # rather than with a specific label
  367         return "" if $PG_STOP_FLAG;
  368     my $number=shift;
  369     $vecnum = 0;
  370     my $row = shift;
  371     my $col = shift;
  372 #   my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
  373     my $label = eval(q!$main::QUIZ_PREFIX."ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__"!);
  374     push(@PG_UNLABELED_ANSWERS,$label);
  375     $label;
  376 }
  377 
  378 sub NEW_ANS_ARRAY_NAME_EXTENSION {        # this keeps track of the answers which are entered implicitly,
  379                                           # rather than with a specific label
  380         return "" if $PG_STOP_FLAG;
  381     my $number=shift;
  382     my $row = shift;
  383     my $col = shift;
  384     if( $row == 0 && $col == 0 ){
  385       $vecnum += 1;
  386     }
  387     #FIXME   change made to conform to HTML 4.01 standards.  "Name" attributes can only contain
  388     # alphanumeric characters,   _ : and .
  389     # Also need to make corresponding changes in PGmorematrixmacros.  grep for ArRaY.
  390     #my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
  391     my $label = eval(q!$main::QUIZ_PREFIX."ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__"!);
  392     eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!);#put the labels into the hash to be caught later for recording purposes
  393     $label;
  394 }
  395 
  396 
  397 sub get_PG_ANSWERS_HASH {
  398   # update the PG_ANSWWERS_HASH, then report the result.
  399   # This is used in writing sequential problems
  400   # if there is an input, use that as a key into the answer hash
  401   my $key = shift;
  402   my (%pg_answers_hash, @pg_unlabeled_answers);
  403   %pg_answers_hash= %PG_ANSWERS_HASH;
  404   #warn "order ", eval(q!@main::PG_ANSWER_ENTRY_ORDER!);
  405   #warn "pg answers", %PG_ANSWERS_HASH;
  406   #warn "unlabeled", @PG_UNLABELED_ANSWERS;
  407     my $index=0;
  408     foreach my $label (@PG_UNLABELED_ANSWERS) {
  409         if ( defined($PG_ANSWERS[$index]) ) {
  410         $pg_answers_hash{"$label"}= $PG_ANSWERS[$index];
  411       #warn "recording answer label = $label";
  412       } else {
  413         warn "No answer provided by instructor for answer $label";
  414       }
  415       $index++;
  416     }
  417     if ($key) {
  418       return $pg_answers_hash{$key};
  419     } else {
  420       return %pg_answers_hash;
  421     }
  422 }
  423 # ENDDOCUMENT must come at the end of every .pg file.
  424 #   It exports the resulting text of the problem, the text to be used in HTML header material
  425 #   (for javaScript), the list of answer evaluators and any other flags.  It can appear only once and
  426 #   it MUST be the last statement in the problem.
  427 
  428 =head2 ENDDOCUMENT()
  429 
  430 ENDDOCUMENT() must the last executable statement in any problem template.  It can
  431 only appear once.  It returns
  432 an array consisting of
  433 
  434   A reference to a string containing the rendered text of the problem.
  435   A reference to a string containing text to be placed in the header
  436                (for javaScript)
  437   A reference to the array containing the answer evaluators.
  438                (May be changed to a hash soon.)
  439   A reference to an associative array (hash) containing various flags.
  440 
  441   The following flags are set by ENDDOCUMENT:
  442   (1) showPartialCorrectAnswers  -- determines whether students are told which
  443       of their answers in a problem are wrong.
  444   (2) recordSubmittedAnswers  -- determines whether students submitted answers
  445       are saved.
  446   (3) refreshCachedImages  -- determines whether the cached image of the problem
  447       in typeset mode is always refreshed (i.e. setting this to 1 means cached
  448       images are not used).
  449   (4) solutionExits   -- indicates the existence of a solution.
  450   (5) hintExits   -- indicates the existence of a hint.
  451   (6) comment   -- contents of COMMENT commands if any.
  452   (7) showHintLimit -- determines the number of attempts after which hint(s) will be shown
  453 
  454   (8) PROBLEM_GRADER_TO_USE -- chooses the problem grader to be used in this order
  455     (a) A problem grader specified by the problem using:
  456         install_problem_grader(\&grader);
  457     (b) One of the standard problem graders defined in PGanswermacros.pl when set to
  458         'std_problem_grader' or 'avg_problem_grader' by the environment variable
  459         $PG_environment{PROBLEM_GRADER_TO_USE}
  460     (c) A subroutine referenced by $PG_environment{PROBLEM_GRADER_TO_USE}
  461     (d) The default &std_problem_grader defined in PGanswermacros.pl
  462 
  463 
  464 =cut
  465 
  466 sub ENDDOCUMENT {
  467 
  468     my $index=0;
  469     foreach my $label (@PG_UNLABELED_ANSWERS) {
  470         if ( defined($PG_ANSWERS[$index]) ) {
  471         $PG_ANSWERS_HASH{"$label"}= $PG_ANSWERS[$index];
  472       #warn "recording answer label = $label";
  473       } else {
  474         warn "No answer provided by instructor for answer $label";
  475       }
  476       $index++;
  477     }
  478 
  479     $STRINGforOUTPUT .="\n";
  480    eval q{  #make sure that "main" points to the current safe compartment by evaluating these lines.
  481     $main::PG_FLAGS{'showPartialCorrectAnswers'} = $main::showPartialCorrectAnswers;
  482     $main::PG_FLAGS{'recordSubmittedAnswers'} = $main::recordSubmittedAnswers;
  483     $main::PG_FLAGS{'refreshCachedImages'} = $main::refreshCachedImages;
  484     $main::PG_FLAGS{'comment'} = $main::pgComment;
  485     $main::PG_FLAGS{'hintExists'} = $main::hintExists;
  486     $main::PG_FLAGS{'showHintLimit'} = $main::showHint;
  487     $main::PG_FLAGS{'solutionExists'} = $main::solutionExists;
  488     $main::PG_FLAGS{ANSWER_ENTRY_ORDER} = \@main::PG_ANSWER_ENTRY_ORDER;
  489     $main::PG_FLAGS{KEPT_EXTRA_ANSWERS} = \@main::KEPT_EXTRA_ANSWERS;##need to keep array labels that don't call "RECORD_ANS_NAME"
  490     $main::PG_FLAGS{ANSWER_PREFIX} = $main::ANSWER_PREFIX;
  491     # install problem grader
  492     if (defined($main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) ) {
  493       # problem grader defined within problem -- no further action needed
  494     } elsif ( defined( $main::envir{PROBLEM_GRADER_TO_USE} ) ) {
  495       if (ref($main::envir{PROBLEM_GRADER_TO_USE}) eq 'CODE' ) {         # user defined grader
  496         $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = $main::envir{PROBLEM_GRADER_TO_USE};
  497       } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'std_problem_grader' ) {
  498         if (defined(&std_problem_grader) ){
  499           $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
  500         } # std_problem_grader is the default in any case so don't give a warning.
  501       } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'avg_problem_grader' ) {
  502         if (defined(&avg_problem_grader) ){
  503           $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&avg_problem_grader; # defined in PGanswermacros.pl
  504         }
  505         #else { # avg_problem_grader will be installed by PGtranslator so there is no need for a warning.
  506         # warn "The problem grader 'avg_problem_grader' has not been defined.  Has PGanswermacros.pl been loaded?";
  507         #}
  508       } else {
  509         warn "Error:  $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} is not a known program grader.";
  510       }
  511     } elsif (defined(&std_problem_grader)) {
  512       $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
  513     } else {
  514       # PGtranslator will install its default problem grader
  515     }
  516 
  517     warn "ERROR: The problem grader is not a subroutine" unless ref( $main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) eq 'CODE'
  518                      or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'std_problem_grader'
  519                      or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'avg_problem_grader';
  520      # return results
  521     };
  522 
  523     $STRINGforOUTPUT .= '<SCRIPT> jsMath.wwProcess() </SCRIPT>'
  524       if ($main::envir{displayMode} eq 'HTML_jsMath');
  525 
  526     if ($main::envir{displayMode} eq 'HTML_asciimath') {
  527       $STRINGforOUTPUT .= '<SCRIPT> translate() </SCRIPT>';
  528       $STRINGforHEADER_TEXT .=
  529         '<object id="mathplayer" classid="clsid:32F66A20-7614-11D4-BD11-00104BD3F987">' . "\n" .
  530         '</object><?import namespace="mml" implementation="#mathplayer"?>'
  531   unless ($STRINGforHEADER_TEXT =~ m/mathplayer/);
  532     }
  533   $STRINGforOUTPUT .= MODES(%{PG_restricted_eval('$main::problemPostamble')});
  534 
  535   (\$STRINGforOUTPUT, \$STRINGforHEADER_TEXT,\%PG_ANSWERS_HASH,eval(q!\%main::PG_FLAGS!));
  536 }
  537 
  538 
  539 
  540 =head2 INITIALIZE_PG()
  541 
  542 This is executed each C<DOCUMENT()> is called.  For backward compatibility
  543 C<loadMacros> also checks whether the C<macroDirectory> has been defined
  544 and if not, it runs C<INITIALIZE_PG()> and issues a warning.
  545 
  546 =cut
  547 
  548 
  549 1;

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