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1 : gage 4997
2 : sh002i 1050 # This file provided the fundamental macros for the pg language
3 :     # These macros define the interface between the problems written by
4 :     # the professor and the processing which occurs in the script
5 :     # processProblem.pl
6 :    
7 :    
8 :     BEGIN {
9 :     be_strict();
10 :     }
11 :    
12 :     sub _PG_init{
13 :    
14 :     }
15 :    
16 :     #package PG;
17 :    
18 :    
19 :     =head1 NAME
20 :    
21 :     PG.pl --- located in the courseScripts directory.
22 :     Defines the Program Generating language at the most basic level.
23 :    
24 :     =head1 SYNPOSIS
25 :    
26 :     The basic PG problem structure:
27 :    
28 :     DOCUMENT(); # should be the first statment in the problem
29 :     loadMacros(.....); # (optional) load other macro files if needed.
30 :     # (loadMacros is defined in F<dangerousMacros.pl>)
31 :    
32 :     HEADER_TEXT(...); # (optional) used only for inserting javaScript into problems.
33 :    
34 :     # # insert text of problems
35 :     TEXT("Problem text to be",
36 :     "displayed. Enter 1 in this blank:",
37 :     ANS_RULE(1,30) # ANS_RULE() defines an answer blank 30 characters long.
38 :     # It is defined in F<PGbasicmacros.pl>
39 :     );
40 :    
41 :    
42 :     ANS( answer_evalutors); # see F<PGanswermacros.pl> for examples of answer evaluatiors.
43 :    
44 :     ENDDOCUMENT() # must be the last statement in the problem
45 :    
46 :    
47 :    
48 :     =head1 DESCRIPTION
49 :    
50 :     As described in the synopsis, this file and the macros C<DOCUMENT()> and C<ENDDOCUMENT()> determine
51 :     the interface between problems written in the PG language and the rest of B<WeBWorK>, in particular
52 :     the subroutine C<createPGtext(()> in the file F<translate.pl>.
53 :    
54 :     C<DOCUMENT()> must be the first statement in each problem template.
55 :     It initializes variables,
56 :     in particular all of the contents of the
57 :     environment variable become defined in the problem enviroment.
58 :     (See
59 :     L</webwork_system_html/docs/techdescription/pglanguage/PGenvironment.html>)
60 :    
61 :     ENDDOCUMENT() must the last executable statement in any problem template. It returns
62 :     the rendered problem, answer evaluators and other flags to the rest of B<WeBWorK>, specificially
63 :     to the routine C<createPGtext()> defined in F<translate.pl>
64 :    
65 :    
66 :     The C<HEADER_TEXT()>, C<TEXT()>, and C<ANS()> functions load the
67 :     header text string, the problem text string.
68 :     and the answer evaulator queue respectively.
69 :    
70 :    
71 :     =cut
72 :    
73 :    
74 :     # Private variables for the PG.pl file.
75 :    
76 :     my ($STRINGforOUTPUT, $STRINGforHEADER_TEXT, @PG_ANSWERS, @PG_UNLABELED_ANSWERS);
77 :     my %PG_ANSWERS_HASH ;
78 : gage 3385 our $PG_STOP_FLAG;
79 : malsyned 1280
80 : gage 3385 # my variables are unreliable if two DOCUMENTS were to be called before an ENDDOCUMENT
81 : gage 1266 # there could be conflicts. As I understand the behavior of the Apache child
82 :     # this cannot occur -- a child finishes with one request before obtaining the next
83 : sh002i 1050
84 :     # DOCUMENT must come early in every .pg file, before any answers or text are
85 :     # defined. It initializes the variables.
86 :     # It can appear only once.
87 :    
88 :     =head2 DOCUMENT()
89 :    
90 :     C<DOCUMENT()> must be the first statement in each problem template. It can
91 :     only be used once in each problem.
92 :    
93 :     C<DOCUMENT()> initializes some empty variables and via C<INITIALIZE_PG()> unpacks the
94 :     variables in the C<%envir> variable which is implicitly passed to the problem. It must
95 :     be the first statement in any problem template. It
96 :     also unpacks any answers submitted and places them in the C<@submittedAnswer> list,
97 :     saves the problem seed in C<$PG_original_problemSeed> in case you need it later, and
98 :     initializes the pseudo random number generator object in C<$PG_random_generator>.
99 :    
100 :     You can reset the standard number generator using the command:
101 :    
102 :     $PG_random_generator->srand($new_seed_value);
103 :    
104 :     (See also C<SRAND> in the L<PGbasicmacros.pl> file.)
105 :    
106 :     The
107 :     environment variable contents is defined in
108 :     L</webwork_system_html/docs/techdescription/pglanguage/PGenvironment.html>
109 :    
110 :    
111 :     =cut
112 :    
113 :     sub DOCUMENT {
114 : gage 1253
115 : sh002i 1050 $STRINGforOUTPUT ="";
116 :     $STRINGforHEADER_TEXT ="";
117 :     @PG_ANSWERS=();
118 : gage 3385 $PG_STOP_FLAG=0;
119 : sh002i 1050 @PG_UNLABELED_ANSWERS = ();
120 :     %PG_ANSWERS_HASH = ();
121 : gage 1253 # FIXME: We are initializing these variables into both Safe::Root1 (the cached safe compartment)
122 :     # and Safe::Root2 (the current one)
123 :     # There is a good chance they won't be properly updated in one or the other of these compartments.
124 :    
125 : gage 1266 # @main::PG_ANSWER_ENTRY_ORDER = ();
126 :     # $main::ANSWER_PREFIX = 'AnSwEr';
127 :     # %main::PG_FLAGS=(); #global flags
128 :     # $main::showPartialCorrectAnswers = 0 unless defined($main::showPartialCorrectAnswers );
129 :     # $main::showHint = 1 unless defined($main::showHint);
130 :     # $main::solutionExists =0;
131 :     # $main::hintExists =0;
132 :     # %main::gifs_created = ();
133 : gage 1253 eval(q!
134 :     @main::PG_ANSWER_ENTRY_ORDER = ();
135 :     $main::ANSWER_PREFIX = 'AnSwEr';
136 :     %main::PG_FLAGS=(); #global flags
137 :     $main::showPartialCorrectAnswers = 0 unless defined($main::showPartialCorrectAnswers );
138 :     $main::showHint = 1 unless defined($main::showHint);
139 :     $main::solutionExists =0;
140 :     $main::hintExists =0;
141 : jj 3520 $main::pgComment = '';
142 : gage 1253 %main::gifs_created = ();
143 : malsyned 1280
144 : gage 1253 !);
145 : gage 1266 # warn eval(q! "PG.pl: The envir variable $main::{envir} is".join(" ",%main::envir)!);
146 :     my $rh_envir = eval(q!\%main::envir!);
147 :     my %envir = %$rh_envir;
148 : dpvc 2698
149 :     # Save the file name for use in error messages
150 :     my ($callpkg,$callfile) = caller(0);
151 :     $envir{__files__}{$callfile} = $envir{templateDirectory}.$envir{fileName};
152 :    
153 : gage 1304 #no strict;
154 : gage 1266 foreach my $var (keys %envir) {
155 :     eval(q!$main::!.$var.q! = $main::envir{!.$var.q!}! ); #whew!! makes sure $var is interpolated but $main:: is evaluated at run time.
156 :     # warn eval(q! "var $var is defined ". $main::!.$var);
157 :     warn "Problem defining ", q{\$main::}.$var, " while initializing the PG problem: $@" if $@;
158 :     }
159 : gage 1304 #use strict;
160 :     #FIXME these strict pragmas don't seem to be needed and they cause trouble in perl 5.6.0
161 : sh002i 1050
162 : gage 1266
163 :    
164 : gage 1253 eval(q!
165 :     @main::submittedAnswers = @{$main::refSubmittedAnswers} if defined($main::refSubmittedAnswers);
166 :     $main::PG_original_problemSeed = $main::problemSeed;
167 :     $main::PG_random_generator = new PGrandom($main::problemSeed) || die "Can't create random number generator.";
168 :     $main::ans_rule_count = 0; # counts questions
169 : lr003k 1122
170 : gage 1253 # end unpacking of environment variables.
171 :     $main::QUIZ_PREFIX = '' unless defined($main::QUIZ_PREFIX)
172 :    
173 :     !);
174 : gage 1266 # @main::submittedAnswers = @{$main::refSubmittedAnswers} if defined($main::refSubmittedAnswers);
175 :     # $main::PG_original_problemSeed = $main::problemSeed;
176 :     # $main::PG_random_generator = new PGrandom($main::problemSeed) || die "Can't create random number generator.";
177 :     # $main::ans_rule_count = 0; # counts questions
178 : sh002i 1050
179 :     # end unpacking of environment variables.
180 : gage 1266 # $main::QUIZ_PREFIX = '' unless defined($main::QUIZ_PREFIX)
181 : dpvc 2166
182 : dpvc 2984 if ($main::envir{displayMode} eq 'HTML_jsMath') {
183 :     my $prefix = "";
184 :     if (!$main::envir{jsMath}{reportMissingFonts}) {
185 : dpvc 3765 $prefix .= '<SCRIPT>noFontMessage = 1</SCRIPT>'."\n";
186 : dpvc 2984 } elsif ($main::envir{jsMath}{missingFontMessage}) {
187 : dpvc 3765 $prefix .= '<SCRIPT>missingFontMessage = "'.$main::envir{jsMath}{missingFontMessage}.'"</SCRIPT>'."\n";
188 : dpvc 2984 }
189 : dpvc 3765 $prefix .= '<SCRIPT>processDoubleClicks = '.($main::envir{jsMath}{processDoubleClicks}?'1':'0')."</SCRIPT>\n";
190 : dpvc 2984 $STRINGforOUTPUT =
191 :     $prefix .
192 :     '<SCRIPT SRC="'.$main::envir{jsMathURL}.'"></SCRIPT>' . "\n" .
193 :     '<NOSCRIPT><CENTER><FONT COLOR="#CC0000">' .
194 :     '<B>Warning: the mathematics on this page requires JavaScript.<BR>' .
195 :     'If your browser supports it, be sure it is enabled.</B>'.
196 :     '</FONT></CENTER><p></NOSCRIPT>' .
197 :     $STRINGforOUTPUT;
198 : dpvc 3539 $STRINGforOUTPUT .=
199 :     '<SCRIPT>jsMath.Setup.Script("plugins/noImageFonts.js")</SCRIPT>'
200 :     if ($main::envir{jsMath}{noImageFonts});
201 : dpvc 2984 }
202 : gage 1253
203 : dpvc 2199 $STRINGforOUTPUT = '<SCRIPT SRC="'.$main::envir{asciimathURL}.'"></SCRIPT>' . "\n" .
204 :     '<SCRIPT>mathcolor = "black"</SCRIPT>' . $STRINGforOUTPUT
205 :     if ($main::envir{displayMode} eq 'HTML_asciimath');
206 : dpvc 4386
207 :     $STRINGforOUTPUT = '<SCRIPT SRC="'.$main::envir{LaTeXMathMLURL}.'"></SCRIPT>'."\n" . $STRINGforOUTPUT
208 :     if ($main::envir{displayMode} eq 'HTML_LaTeXMathML');
209 :    
210 : sh002i 1050 }
211 :    
212 : gage 1266 sub inc_ans_rule_count {
213 :     eval(q!++$main::ans_rule_count!); # evalute at runtime to get correct main::
214 :     }
215 : sh002i 1050 # HEADER_TEXT is for material which is destined to be placed in the header of the html problem -- such
216 :     # as javaScript code.
217 :    
218 :     =head2 HEADER_TEXT()
219 :    
220 :    
221 :     HEADER_TEXT("string1", "string2", "string3");
222 :    
223 :     The C<HEADER_TEXT()>
224 :     function concatenates its arguments and places them in the output
225 :     header text string. It is used for material which is destined to be placed in
226 :     the header of the html problem -- such as javaScript code.
227 :     It can be used more than once in a file.
228 :    
229 :    
230 :     =cut
231 :    
232 :     sub HEADER_TEXT {
233 :     my @in = @_;
234 :     $STRINGforHEADER_TEXT .= join(" ",@in);
235 :     }
236 :    
237 :     # TEXT is the function which defines text which will appear in the problem.
238 :     # All text must be an argument to this function. Any other statements
239 :     # are calculations (done in perl) which will not directly appear in the
240 :     # output. Think of this as the "print" function for the .pg language.
241 :     # It can be used more than once in a file.
242 :    
243 :     =head2 TEXT()
244 :    
245 :     TEXT("string1", "string2", "string3");
246 :    
247 :     The C<TEXT()> function concatenates its arguments and places them in the output
248 :     text string. C<TEXT()> is the function which defines text which will appear in the problem.
249 :     All text must be an argument to this function. Any other statements
250 :     are calculations (done in perl) which will not directly appear in the
251 :     output. Think of this as the "print" function for the .pg language.
252 :     It can be used more than once in a file.
253 :    
254 :     =cut
255 :    
256 :     sub TEXT {
257 : gage 3385 return "" if $PG_STOP_FLAG;
258 : sh002i 1050 my @in = @_;
259 :     $STRINGforOUTPUT .= join(" ",@in);
260 : gage 3385 }
261 : gage 3387
262 :     =head2 STOP_RENDERING()
263 :    
264 :     STOP_RENDERING() unless all_answers_are_correct;
265 :    
266 :     No text is printed and no answer blanks or answer evaluators are stored or processed until
267 :     RESUME_RENDERING() is executed.
268 :    
269 :     =cut
270 :    
271 : gage 3385 sub STOP_RENDERING {
272 :     $PG_STOP_FLAG=1;
273 :     "";
274 :     }
275 : gage 3387
276 :     =head2 RESUME_RENDERING()
277 :    
278 :     RESUME_RENDERING();
279 :    
280 :     Resumes processing of text, answer blanks, and
281 :     answer evaluators.
282 :    
283 :     =cut
284 :    
285 : gage 3385 sub RESUME_RENDERING {
286 :     $PG_STOP_FLAG=0;
287 :     "";
288 :     }
289 : sh002i 1050
290 :     =head2 ANS()
291 :    
292 :     ANS(answer_evaluator1, answer_evaluator2, answer_evaluator3,...)
293 :    
294 :     Places the answer evaluators in the unlabeled answer_evaluator queue. They will be paired
295 :     with unlabeled answer rules (answer entry blanks) in the order entered. This is the standard
296 :     method for entering answers.
297 :    
298 :     LABELED_ANS(answer_evaluater_name1, answer_evaluator1, answer_evaluater_name2,answer_evaluator2,...)
299 :    
300 :     Places the answer evaluators in the labeled answer_evaluator hash. This allows pairing of
301 :     labeled answer evaluators and labeled answer rules which may not have been entered in the same
302 :     order.
303 :    
304 :     =cut
305 :    
306 :     sub ANS{ # store answer evaluators which have not been explicitly labeled
307 : gage 3385 return "" if $PG_STOP_FLAG;
308 : sh002i 1050 my @in = @_;
309 :     while (@in ) {
310 :     warn("<BR><B>Error in ANS:$in[0]</B> -- inputs must be references to
311 :     subroutines<BR>")
312 :     unless ref($in[0]);
313 :     push(@PG_ANSWERS, shift @in );
314 : gage 3385 }
315 : sh002i 1050 }
316 :     sub LABELED_ANS { #a better alias for NAMED_ANS
317 :     &NAMED_ANS;
318 :     }
319 :    
320 :     sub NAMED_ANS{ # store answer evaluators which have been explicitly labeled (submitted in a hash)
321 : gage 3385 return "" if $PG_STOP_FLAG;
322 : sh002i 1050 my @in = @_;
323 :     while (@in ) {
324 :     my $label = shift @in;
325 : malsyned 1280 $label = eval(q!$main::QUIZ_PREFIX.$label!);
326 : sh002i 1050 my $ans_eval = shift @in;
327 :     TEXT("<BR><B>Error in NAMED_ANS:$in[0]</B>
328 :     -- inputs must be references to subroutines<BR>")
329 :     unless ref($ans_eval);
330 :     $PG_ANSWERS_HASH{$label}= $ans_eval;
331 :     }
332 :     }
333 :     sub RECORD_ANS_NAME { # this maintains the order in which the answer rules are printed.
334 : gage 3385 return "" if $PG_STOP_FLAG;
335 : sh002i 1050 my $label = shift;
336 : malsyned 1280 eval(q!push(@main::PG_ANSWER_ENTRY_ORDER, $label)!);
337 : sh002i 1050 $label;
338 :     }
339 :    
340 :     sub NEW_ANS_NAME { # this keeps track of the answers which are entered implicitly,
341 :     # rather than with a specific label
342 : gage 3385 return "" if $PG_STOP_FLAG;
343 : sh002i 1050 my $number=shift;
344 : malsyned 1280 my $prefix = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!);
345 :     my $label = $prefix.$number;
346 : sh002i 1050 push(@PG_UNLABELED_ANSWERS,$label);
347 :     $label;
348 :     }
349 :     sub ANS_NUM_TO_NAME { # This converts a number to an answer label for use in
350 :     # radio button and check box answers. No new answer
351 :     # name is recorded.
352 :     my $number=shift;
353 : dpvc 2400 my $label = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!).$number;
354 : sh002i 1050 $label;
355 :     }
356 :    
357 : lr003k 1122 my $vecnum;
358 :    
359 : gage 1791 sub RECORD_FORM_LABEL { # this stores form data (such as sticky answers), but does nothing more
360 :     # 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.
361 : gage 3385 return "" if $PG_STOP_FLAG;
362 : gage 1791 my $label = shift; # the label of the input box or textarea
363 :     eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!); #put the labels into the hash to be caught later for recording purposes
364 :     $label;
365 :     }
366 : lr003k 1122 sub NEW_ANS_ARRAY_NAME { # this keeps track of the answers which are entered implicitly,
367 :     # rather than with a specific label
368 : gage 3385 return "" if $PG_STOP_FLAG;
369 : lr003k 1122 my $number=shift;
370 :     $vecnum = 0;
371 :     my $row = shift;
372 :     my $col = shift;
373 : gage 1896 # my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
374 : glarose 4887 my $label = eval(q!$main::QUIZ_PREFIX."ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__"!);
375 : lr003k 1122 push(@PG_UNLABELED_ANSWERS,$label);
376 :     $label;
377 :     }
378 :    
379 :     sub NEW_ANS_ARRAY_NAME_EXTENSION { # this keeps track of the answers which are entered implicitly,
380 : gage 3385 # rather than with a specific label
381 :     return "" if $PG_STOP_FLAG;
382 : lr003k 1122 my $number=shift;
383 :     my $row = shift;
384 :     my $col = shift;
385 :     if( $row == 0 && $col == 0 ){
386 :     $vecnum += 1;
387 :     }
388 : gage 1896 #FIXME change made to conform to HTML 4.01 standards. "Name" attributes can only contain
389 :     # alphanumeric characters, _ : and .
390 :     # Also need to make corresponding changes in PGmorematrixmacros. grep for ArRaY.
391 :     #my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
392 : glarose 4887 my $label = eval(q!$main::QUIZ_PREFIX."ArRaY"."$number"."__"."$vecnum".":"."$row".":"."$col"."__"!);
393 : lr003k 1365 eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!);#put the labels into the hash to be caught later for recording purposes
394 : lr003k 1122 $label;
395 :     }
396 :    
397 : gage 3385
398 :     sub get_PG_ANSWERS_HASH {
399 :     # update the PG_ANSWWERS_HASH, then report the result.
400 :     # This is used in writing sequential problems
401 :     # if there is an input, use that as a key into the answer hash
402 :     my $key = shift;
403 :     my (%pg_answers_hash, @pg_unlabeled_answers);
404 :     %pg_answers_hash= %PG_ANSWERS_HASH;
405 :     #warn "order ", eval(q!@main::PG_ANSWER_ENTRY_ORDER!);
406 :     #warn "pg answers", %PG_ANSWERS_HASH;
407 :     #warn "unlabeled", @PG_UNLABELED_ANSWERS;
408 :     my $index=0;
409 :     foreach my $label (@PG_UNLABELED_ANSWERS) {
410 :     if ( defined($PG_ANSWERS[$index]) ) {
411 :     $pg_answers_hash{"$label"}= $PG_ANSWERS[$index];
412 :     #warn "recording answer label = $label";
413 :     } else {
414 :     warn "No answer provided by instructor for answer $label";
415 :     }
416 :     $index++;
417 :     }
418 :     if ($key) {
419 :     return $pg_answers_hash{$key};
420 :     } else {
421 :     return %pg_answers_hash;
422 :     }
423 :     }
424 : sh002i 1050 # ENDDOCUMENT must come at the end of every .pg file.
425 :     # It exports the resulting text of the problem, the text to be used in HTML header material
426 :     # (for javaScript), the list of answer evaluators and any other flags. It can appear only once and
427 :     # it MUST be the last statement in the problem.
428 :    
429 :     =head2 ENDDOCUMENT()
430 :    
431 :     ENDDOCUMENT() must the last executable statement in any problem template. It can
432 :     only appear once. It returns
433 :     an array consisting of
434 :    
435 :     A reference to a string containing the rendered text of the problem.
436 :     A reference to a string containing text to be placed in the header
437 :     (for javaScript)
438 :     A reference to the array containing the answer evaluators.
439 :     (May be changed to a hash soon.)
440 :     A reference to an associative array (hash) containing various flags.
441 :    
442 :     The following flags are set by ENDDOCUMENT:
443 :     (1) showPartialCorrectAnswers -- determines whether students are told which
444 :     of their answers in a problem are wrong.
445 :     (2) recordSubmittedAnswers -- determines whether students submitted answers
446 :     are saved.
447 :     (3) refreshCachedImages -- determines whether the cached image of the problem
448 :     in typeset mode is always refreshed (i.e. setting this to 1 means cached
449 :     images are not used).
450 :     (4) solutionExits -- indicates the existence of a solution.
451 :     (5) hintExits -- indicates the existence of a hint.
452 : jj 3520 (6) comment -- contents of COMMENT commands if any.
453 :     (7) showHintLimit -- determines the number of attempts after which hint(s) will be shown
454 : sh002i 1050
455 : jj 3520 (8) PROBLEM_GRADER_TO_USE -- chooses the problem grader to be used in this order
456 : sh002i 1050 (a) A problem grader specified by the problem using:
457 :     install_problem_grader(\&grader);
458 :     (b) One of the standard problem graders defined in PGanswermacros.pl when set to
459 :     'std_problem_grader' or 'avg_problem_grader' by the environment variable
460 :     $PG_environment{PROBLEM_GRADER_TO_USE}
461 :     (c) A subroutine referenced by $PG_environment{PROBLEM_GRADER_TO_USE}
462 :     (d) The default &std_problem_grader defined in PGanswermacros.pl
463 :    
464 :    
465 :     =cut
466 :    
467 :     sub ENDDOCUMENT {
468 :    
469 :     my $index=0;
470 :     foreach my $label (@PG_UNLABELED_ANSWERS) {
471 :     if ( defined($PG_ANSWERS[$index]) ) {
472 :     $PG_ANSWERS_HASH{"$label"}= $PG_ANSWERS[$index];
473 : malsyned 1280 #warn "recording answer label = $label";
474 : sh002i 1050 } else {
475 :     warn "No answer provided by instructor for answer $label";
476 :     }
477 :     $index++;
478 :     }
479 :    
480 :     $STRINGforOUTPUT .="\n";
481 : gage 1266 eval q{ #make sure that "main" points to the current safe compartment by evaluating these lines.
482 : sh002i 1050 $main::PG_FLAGS{'showPartialCorrectAnswers'} = $main::showPartialCorrectAnswers;
483 :     $main::PG_FLAGS{'recordSubmittedAnswers'} = $main::recordSubmittedAnswers;
484 :     $main::PG_FLAGS{'refreshCachedImages'} = $main::refreshCachedImages;
485 : jj 3520 $main::PG_FLAGS{'comment'} = $main::pgComment;
486 : sh002i 1050 $main::PG_FLAGS{'hintExists'} = $main::hintExists;
487 :     $main::PG_FLAGS{'showHintLimit'} = $main::showHint;
488 :     $main::PG_FLAGS{'solutionExists'} = $main::solutionExists;
489 :     $main::PG_FLAGS{ANSWER_ENTRY_ORDER} = \@main::PG_ANSWER_ENTRY_ORDER;
490 : lr003k 1365 $main::PG_FLAGS{KEPT_EXTRA_ANSWERS} = \@main::KEPT_EXTRA_ANSWERS;##need to keep array labels that don't call "RECORD_ANS_NAME"
491 : sh002i 1050 $main::PG_FLAGS{ANSWER_PREFIX} = $main::ANSWER_PREFIX;
492 :     # install problem grader
493 :     if (defined($main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) ) {
494 :     # problem grader defined within problem -- no further action needed
495 :     } elsif ( defined( $main::envir{PROBLEM_GRADER_TO_USE} ) ) {
496 :     if (ref($main::envir{PROBLEM_GRADER_TO_USE}) eq 'CODE' ) { # user defined grader
497 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = $main::envir{PROBLEM_GRADER_TO_USE};
498 :     } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'std_problem_grader' ) {
499 :     if (defined(&std_problem_grader) ){
500 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
501 :     } # std_problem_grader is the default in any case so don't give a warning.
502 :     } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'avg_problem_grader' ) {
503 :     if (defined(&avg_problem_grader) ){
504 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&avg_problem_grader; # defined in PGanswermacros.pl
505 :     }
506 :     #else { # avg_problem_grader will be installed by PGtranslator so there is no need for a warning.
507 :     # warn "The problem grader 'avg_problem_grader' has not been defined. Has PGanswermacros.pl been loaded?";
508 :     #}
509 :     } else {
510 :     warn "Error: $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} is not a known program grader.";
511 :     }
512 :     } elsif (defined(&std_problem_grader)) {
513 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
514 :     } else {
515 :     # PGtranslator will install its default problem grader
516 :     }
517 : gage 1266
518 : sh002i 1050 warn "ERROR: The problem grader is not a subroutine" unless ref( $main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) eq 'CODE'
519 :     or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'std_problem_grader'
520 :     or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'avg_problem_grader';
521 :     # return results
522 : gage 1266 };
523 : dpvc 2166
524 : dpvc 3566 $STRINGforOUTPUT .= '<SCRIPT> jsMath.wwProcess() </SCRIPT>'
525 : dpvc 2166 if ($main::envir{displayMode} eq 'HTML_jsMath');
526 : dpvc 2199
527 : dpvc 2201 if ($main::envir{displayMode} eq 'HTML_asciimath') {
528 :     $STRINGforOUTPUT .= '<SCRIPT> translate() </SCRIPT>';
529 :     $STRINGforHEADER_TEXT .=
530 :     '<object id="mathplayer" classid="clsid:32F66A20-7614-11D4-BD11-00104BD3F987">' . "\n" .
531 :     '</object><?import namespace="mml" implementation="#mathplayer"?>'
532 :     unless ($STRINGforHEADER_TEXT =~ m/mathplayer/);
533 :     }
534 : jj 3553 $STRINGforOUTPUT .= MODES(%{PG_restricted_eval('$main::problemPostamble')});
535 : malsyned 1280
536 : gage 1266 (\$STRINGforOUTPUT, \$STRINGforHEADER_TEXT,\%PG_ANSWERS_HASH,eval(q!\%main::PG_FLAGS!));
537 : sh002i 1050 }
538 :    
539 :    
540 :    
541 :     =head2 INITIALIZE_PG()
542 :    
543 :     This is executed each C<DOCUMENT()> is called. For backward compatibility
544 :     C<loadMacros> also checks whether the C<macroDirectory> has been defined
545 :     and if not, it runs C<INITIALIZE_PG()> and issues a warning.
546 :    
547 :     =cut
548 :    
549 :    
550 :     1;

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