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Revision 3520 - (download) (as text) (annotate)
Sat Aug 13 21:45:46 2005 UTC (14 years, 3 months ago) by jj
File size: 20266 byte(s)
Implimentation of COMMENT for comments to appear in the library browser.

    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       $prefix .= '<SCRIPT>function NoFontMessage() {}</SCRIPT>';
  185     } elsif ($main::envir{jsMath}{missingFontMessage}) {
  186       $prefix .=
  187         '<SCRIPT>'.
  188         '  function NoFontMessage() {'.
  189         '    document.writeln(\'<DIV CLASS="noFontMessage">'.
  190           $main::envir{jsMath}{missingFontMessage}.'</DIV>\');'.
  191         '  }' .
  192         '</SCRIPT>';
  193     }
  194     $STRINGforOUTPUT =
  195       $prefix .
  196       '<SCRIPT SRC="'.$main::envir{jsMathURL}.'"></SCRIPT>' . "\n" .
  197       '<NOSCRIPT><CENTER><FONT COLOR="#CC0000">' .
  198       '<B>Warning: the mathematics on this page requires JavaScript.<BR>' .
  199       'If your browser supports it, be sure it is enabled.</B>'.
  200       '</FONT></CENTER><p></NOSCRIPT>' .
  201       $STRINGforOUTPUT;
  202   }
  203 
  204   $STRINGforOUTPUT = '<SCRIPT SRC="'.$main::envir{asciimathURL}.'"></SCRIPT>' . "\n" .
  205                            '<SCRIPT>mathcolor = "black"</SCRIPT>' . $STRINGforOUTPUT
  206     if ($main::envir{displayMode} eq 'HTML_asciimath');
  207 
  208 }
  209 
  210 sub inc_ans_rule_count {
  211   eval(q!++$main::ans_rule_count!); # evalute at runtime to get correct main::
  212 }
  213 # HEADER_TEXT is for material which is destined to be placed in the header of the html problem -- such
  214 #   as javaScript code.
  215 
  216 =head2 HEADER_TEXT()
  217 
  218 
  219   HEADER_TEXT("string1", "string2", "string3");
  220 
  221 The C<HEADER_TEXT()>
  222 function concatenates its arguments and places them in the output
  223 header text string.  It is used for material which is destined to be placed in
  224 the header of the html problem -- such as javaScript code.
  225  It can be used more than once in a file.
  226 
  227 
  228 =cut
  229 
  230 sub HEADER_TEXT {
  231   my @in = @_;
  232   $STRINGforHEADER_TEXT .= join(" ",@in);
  233   }
  234 
  235 # TEXT is the function which defines text which will appear in the problem.
  236 # All text must be an argument to this function.  Any other statements
  237 #   are calculations (done in perl) which will not directly appear in the
  238 # output.  Think of this as the "print" function for the .pg language.
  239 # It can be used more than once in a file.
  240 
  241 =head2 TEXT()
  242 
  243   TEXT("string1", "string2", "string3");
  244 
  245 The C<TEXT()> function concatenates its arguments and places them in the output
  246 text string. C<TEXT()> is the function which defines text which will appear in the problem.
  247 All text must be an argument to this function.  Any other statements
  248 are calculations (done in perl) which will not directly appear in the
  249 output.  Think of this as the "print" function for the .pg language.
  250 It can be used more than once in a file.
  251 
  252 =cut
  253 
  254 sub TEXT {
  255   return "" if $PG_STOP_FLAG;
  256   my @in = @_;
  257   $STRINGforOUTPUT .= join(" ",@in);
  258 }
  259 
  260 =head2 STOP_RENDERING()
  261 
  262   STOP_RENDERING() unless all_answers_are_correct;
  263 
  264 No text is printed and no answer blanks or answer evaluators are stored or processed until
  265 RESUME_RENDERING() is executed.
  266 
  267 =cut
  268 
  269 sub STOP_RENDERING {
  270   $PG_STOP_FLAG=1;
  271   "";
  272 }
  273 
  274 =head2 RESUME_RENDERING()
  275 
  276   RESUME_RENDERING();
  277 
  278 Resumes processing of text,  answer blanks,  and
  279 answer evaluators.
  280 
  281 =cut
  282 
  283 sub RESUME_RENDERING {
  284   $PG_STOP_FLAG=0;
  285   "";
  286 }
  287 
  288 =head2 ANS()
  289 
  290   ANS(answer_evaluator1, answer_evaluator2, answer_evaluator3,...)
  291 
  292 Places the answer evaluators in the unlabeled answer_evaluator queue.  They will be paired
  293 with unlabeled answer rules (answer entry blanks) in the order entered.  This is the standard
  294 method for entering answers.
  295 
  296   LABELED_ANS(answer_evaluater_name1, answer_evaluator1, answer_evaluater_name2,answer_evaluator2,...)
  297 
  298 Places the answer evaluators in the labeled answer_evaluator hash.  This allows pairing of
  299 labeled answer evaluators and labeled answer rules which may not have been entered in the same
  300 order.
  301 
  302 =cut
  303 
  304 sub ANS{             # store answer evaluators which have not been explicitly labeled
  305   return "" if $PG_STOP_FLAG;
  306   my @in = @_;
  307   while (@in ) {
  308          warn("<BR><B>Error in ANS:$in[0]</B> -- inputs must be references to
  309                       subroutines<BR>")
  310       unless ref($in[0]);
  311       push(@PG_ANSWERS, shift @in );
  312   }
  313 }
  314 sub LABELED_ANS {  #a better alias for NAMED_ANS
  315   &NAMED_ANS;
  316 }
  317 
  318 sub NAMED_ANS{     # store answer evaluators which have been explicitly labeled (submitted in a hash)
  319   return "" if $PG_STOP_FLAG;
  320   my @in = @_;
  321   while (@in ) {
  322     my $label = shift @in;
  323     $label = eval(q!$main::QUIZ_PREFIX.$label!);
  324     my $ans_eval = shift @in;
  325     TEXT("<BR><B>Error in NAMED_ANS:$in[0]</B>
  326           -- inputs must be references to subroutines<BR>")
  327       unless ref($ans_eval);
  328     $PG_ANSWERS_HASH{$label}= $ans_eval;
  329   }
  330 }
  331 sub RECORD_ANS_NAME {     # this maintains the order in which the answer rules are printed.
  332     return "" if $PG_STOP_FLAG;
  333   my $label = shift;
  334   eval(q!push(@main::PG_ANSWER_ENTRY_ORDER, $label)!);
  335   $label;
  336 }
  337 
  338 sub NEW_ANS_NAME {        # this keeps track of the answers which are entered implicitly,
  339                           # rather than with a specific label
  340         return "" if $PG_STOP_FLAG;
  341     my $number=shift;
  342     my $prefix = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!);
  343     my $label = $prefix.$number;
  344     push(@PG_UNLABELED_ANSWERS,$label);
  345     $label;
  346 }
  347 sub ANS_NUM_TO_NAME {     # This converts a number to an answer label for use in
  348                           # radio button and check box answers. No new answer
  349                           # name is recorded.
  350     my $number=shift;
  351     my $label = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!).$number;
  352     $label;
  353 }
  354 
  355 my $vecnum;
  356 
  357 sub RECORD_FORM_LABEL  {             # this stores form data (such as sticky answers), but does nothing more
  358                                      # 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.
  359   return "" if $PG_STOP_FLAG;
  360   my $label   = shift;             # the label of the input box or textarea
  361     eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!); #put the labels into the hash to be caught later for recording purposes
  362     $label;
  363 }
  364 sub NEW_ANS_ARRAY_NAME {        # this keeps track of the answers which are entered implicitly,
  365                           # rather than with a specific label
  366         return "" if $PG_STOP_FLAG;
  367     my $number=shift;
  368     $vecnum = 0;
  369     my $row = shift;
  370     my $col = shift;
  371 #   my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
  372     my $label = "ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__";
  373     push(@PG_UNLABELED_ANSWERS,$label);
  374     $label;
  375 }
  376 
  377 sub NEW_ANS_ARRAY_NAME_EXTENSION {        # this keeps track of the answers which are entered implicitly,
  378                                           # rather than with a specific label
  379         return "" if $PG_STOP_FLAG;
  380     my $number=shift;
  381     my $row = shift;
  382     my $col = shift;
  383     if( $row == 0 && $col == 0 ){
  384       $vecnum += 1;
  385     }
  386     #FIXME   change made to conform to HTML 4.01 standards.  "Name" attributes can only contain
  387     # alphanumeric characters,   _ : and .
  388     # Also need to make corresponding changes in PGmorematrixmacros.  grep for ArRaY.
  389     #my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
  390     my $label = "ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__";
  391     eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!);#put the labels into the hash to be caught later for recording purposes
  392     $label;
  393 }
  394 
  395 
  396 sub get_PG_ANSWERS_HASH {
  397   # update the PG_ANSWWERS_HASH, then report the result.
  398   # This is used in writing sequential problems
  399   # if there is an input, use that as a key into the answer hash
  400   my $key = shift;
  401   my (%pg_answers_hash, @pg_unlabeled_answers);
  402   %pg_answers_hash= %PG_ANSWERS_HASH;
  403   #warn "order ", eval(q!@main::PG_ANSWER_ENTRY_ORDER!);
  404   #warn "pg answers", %PG_ANSWERS_HASH;
  405   #warn "unlabeled", @PG_UNLABELED_ANSWERS;
  406     my $index=0;
  407     foreach my $label (@PG_UNLABELED_ANSWERS) {
  408         if ( defined($PG_ANSWERS[$index]) ) {
  409         $pg_answers_hash{"$label"}= $PG_ANSWERS[$index];
  410       #warn "recording answer label = $label";
  411       } else {
  412         warn "No answer provided by instructor for answer $label";
  413       }
  414       $index++;
  415     }
  416     if ($key) {
  417       return $pg_answers_hash{$key};
  418     } else {
  419       return %pg_answers_hash;
  420     }
  421 }
  422 # ENDDOCUMENT must come at the end of every .pg file.
  423 #   It exports the resulting text of the problem, the text to be used in HTML header material
  424 #   (for javaScript), the list of answer evaluators and any other flags.  It can appear only once and
  425 #   it MUST be the last statement in the problem.
  426 
  427 =head2 ENDDOCUMENT()
  428 
  429 ENDDOCUMENT() must the last executable statement in any problem template.  It can
  430 only appear once.  It returns
  431 an array consisting of
  432 
  433   A reference to a string containing the rendered text of the problem.
  434   A reference to a string containing text to be placed in the header
  435                (for javaScript)
  436   A reference to the array containing the answer evaluators.
  437                (May be changed to a hash soon.)
  438   A reference to an associative array (hash) containing various flags.
  439 
  440   The following flags are set by ENDDOCUMENT:
  441   (1) showPartialCorrectAnswers  -- determines whether students are told which
  442       of their answers in a problem are wrong.
  443   (2) recordSubmittedAnswers  -- determines whether students submitted answers
  444       are saved.
  445   (3) refreshCachedImages  -- determines whether the cached image of the problem
  446       in typeset mode is always refreshed (i.e. setting this to 1 means cached
  447       images are not used).
  448   (4) solutionExits   -- indicates the existence of a solution.
  449   (5) hintExits   -- indicates the existence of a hint.
  450   (6) comment   -- contents of COMMENT commands if any.
  451   (7) showHintLimit -- determines the number of attempts after which hint(s) will be shown
  452 
  453   (8) PROBLEM_GRADER_TO_USE -- chooses the problem grader to be used in this order
  454     (a) A problem grader specified by the problem using:
  455         install_problem_grader(\&grader);
  456     (b) One of the standard problem graders defined in PGanswermacros.pl when set to
  457         'std_problem_grader' or 'avg_problem_grader' by the environment variable
  458         $PG_environment{PROBLEM_GRADER_TO_USE}
  459     (c) A subroutine referenced by $PG_environment{PROBLEM_GRADER_TO_USE}
  460     (d) The default &std_problem_grader defined in PGanswermacros.pl
  461 
  462 
  463 =cut
  464 
  465 sub ENDDOCUMENT {
  466 
  467     my $index=0;
  468     foreach my $label (@PG_UNLABELED_ANSWERS) {
  469         if ( defined($PG_ANSWERS[$index]) ) {
  470         $PG_ANSWERS_HASH{"$label"}= $PG_ANSWERS[$index];
  471       #warn "recording answer label = $label";
  472       } else {
  473         warn "No answer provided by instructor for answer $label";
  474       }
  475       $index++;
  476     }
  477 
  478     $STRINGforOUTPUT .="\n";
  479    eval q{  #make sure that "main" points to the current safe compartment by evaluating these lines.
  480     $main::PG_FLAGS{'showPartialCorrectAnswers'} = $main::showPartialCorrectAnswers;
  481     $main::PG_FLAGS{'recordSubmittedAnswers'} = $main::recordSubmittedAnswers;
  482     $main::PG_FLAGS{'refreshCachedImages'} = $main::refreshCachedImages;
  483     $main::PG_FLAGS{'comment'} = $main::pgComment;
  484     $main::PG_FLAGS{'hintExists'} = $main::hintExists;
  485     $main::PG_FLAGS{'showHintLimit'} = $main::showHint;
  486     $main::PG_FLAGS{'solutionExists'} = $main::solutionExists;
  487     $main::PG_FLAGS{ANSWER_ENTRY_ORDER} = \@main::PG_ANSWER_ENTRY_ORDER;
  488     $main::PG_FLAGS{KEPT_EXTRA_ANSWERS} = \@main::KEPT_EXTRA_ANSWERS;##need to keep array labels that don't call "RECORD_ANS_NAME"
  489     $main::PG_FLAGS{ANSWER_PREFIX} = $main::ANSWER_PREFIX;
  490     # install problem grader
  491     if (defined($main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) ) {
  492       # problem grader defined within problem -- no further action needed
  493     } elsif ( defined( $main::envir{PROBLEM_GRADER_TO_USE} ) ) {
  494       if (ref($main::envir{PROBLEM_GRADER_TO_USE}) eq 'CODE' ) {         # user defined grader
  495         $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = $main::envir{PROBLEM_GRADER_TO_USE};
  496       } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'std_problem_grader' ) {
  497         if (defined(&std_problem_grader) ){
  498           $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
  499         } # std_problem_grader is the default in any case so don't give a warning.
  500       } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'avg_problem_grader' ) {
  501         if (defined(&avg_problem_grader) ){
  502           $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&avg_problem_grader; # defined in PGanswermacros.pl
  503         }
  504         #else { # avg_problem_grader will be installed by PGtranslator so there is no need for a warning.
  505         # warn "The problem grader 'avg_problem_grader' has not been defined.  Has PGanswermacros.pl been loaded?";
  506         #}
  507       } else {
  508         warn "Error:  $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} is not a known program grader.";
  509       }
  510     } elsif (defined(&std_problem_grader)) {
  511       $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
  512     } else {
  513       # PGtranslator will install its default problem grader
  514     }
  515 
  516     warn "ERROR: The problem grader is not a subroutine" unless ref( $main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) eq 'CODE'
  517                      or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'std_problem_grader'
  518                      or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'avg_problem_grader';
  519      # return results
  520     };
  521 
  522     $STRINGforOUTPUT .= '<SCRIPT> jsMath.ProcessBeforeShowing() </SCRIPT>'
  523       if ($main::envir{displayMode} eq 'HTML_jsMath');
  524 
  525     if ($main::envir{displayMode} eq 'HTML_asciimath') {
  526       $STRINGforOUTPUT .= '<SCRIPT> translate() </SCRIPT>';
  527       $STRINGforHEADER_TEXT .=
  528         '<object id="mathplayer" classid="clsid:32F66A20-7614-11D4-BD11-00104BD3F987">' . "\n" .
  529         '</object><?import namespace="mml" implementation="#mathplayer"?>'
  530   unless ($STRINGforHEADER_TEXT =~ m/mathplayer/);
  531     }
  532 
  533   (\$STRINGforOUTPUT, \$STRINGforHEADER_TEXT,\%PG_ANSWERS_HASH,eval(q!\%main::PG_FLAGS!));
  534 }
  535 
  536 
  537 
  538 =head2 INITIALIZE_PG()
  539 
  540 This is executed each C<DOCUMENT()> is called.  For backward compatibility
  541 C<loadMacros> also checks whether the C<macroDirectory> has been defined
  542 and if not, it runs C<INITIALIZE_PG()> and issues a warning.
  543 
  544 =cut
  545 
  546 
  547 1;

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