[system] / trunk / pg / macros / PG.pl Repository:
ViewVC logotype

Annotation of /trunk/pg/macros/PG.pl

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1365 - (view) (download) (as text)

1 : lr003k 1365 #!/usr/local/bin/perl
2 : sh002i 1050
3 :     # This file provided the fundamental macros for the pg language
4 :     # These macros define the interface between the problems written by
5 :     # the professor and the processing which occurs in the script
6 :     # processProblem.pl
7 :    
8 :    
9 :     BEGIN {
10 :     be_strict();
11 :     }
12 :    
13 :     sub _PG_init{
14 :    
15 :     }
16 :    
17 :     #package PG;
18 :    
19 :    
20 :     =head1 NAME
21 :    
22 :     PG.pl --- located in the courseScripts directory.
23 :     Defines the Program Generating language at the most basic level.
24 :    
25 :     =head1 SYNPOSIS
26 :    
27 :     The basic PG problem structure:
28 :    
29 :     DOCUMENT(); # should be the first statment in the problem
30 :     loadMacros(.....); # (optional) load other macro files if needed.
31 :     # (loadMacros is defined in F<dangerousMacros.pl>)
32 :    
33 :     HEADER_TEXT(...); # (optional) used only for inserting javaScript into problems.
34 :    
35 :     # # insert text of problems
36 :     TEXT("Problem text to be",
37 :     "displayed. Enter 1 in this blank:",
38 :     ANS_RULE(1,30) # ANS_RULE() defines an answer blank 30 characters long.
39 :     # It is defined in F<PGbasicmacros.pl>
40 :     );
41 :    
42 :    
43 :     ANS( answer_evalutors); # see F<PGanswermacros.pl> for examples of answer evaluatiors.
44 :    
45 :     ENDDOCUMENT() # must be the last statement in the problem
46 :    
47 :    
48 :    
49 :     =head1 DESCRIPTION
50 :    
51 :     As described in the synopsis, this file and the macros C<DOCUMENT()> and C<ENDDOCUMENT()> determine
52 :     the interface between problems written in the PG language and the rest of B<WeBWorK>, in particular
53 :     the subroutine C<createPGtext(()> in the file F<translate.pl>.
54 :    
55 :     C<DOCUMENT()> must be the first statement in each problem template.
56 :     It initializes variables,
57 :     in particular all of the contents of the
58 :     environment variable become defined in the problem enviroment.
59 :     (See
60 :     L</webwork_system_html/docs/techdescription/pglanguage/PGenvironment.html>)
61 :    
62 :     ENDDOCUMENT() must the last executable statement in any problem template. It returns
63 :     the rendered problem, answer evaluators and other flags to the rest of B<WeBWorK>, specificially
64 :     to the routine C<createPGtext()> defined in F<translate.pl>
65 :    
66 :    
67 :     The C<HEADER_TEXT()>, C<TEXT()>, and C<ANS()> functions load the
68 :     header text string, the problem text string.
69 :     and the answer evaulator queue respectively.
70 :    
71 :    
72 :     =cut
73 :    
74 :    
75 :     # Private variables for the PG.pl file.
76 :    
77 :     my ($STRINGforOUTPUT, $STRINGforHEADER_TEXT, @PG_ANSWERS, @PG_UNLABELED_ANSWERS);
78 :     my %PG_ANSWERS_HASH ;
79 : malsyned 1280
80 : gage 1266 # my variables are unreliable if two DOCUMENTS were to be called before and ENDDOCUMENT
81 :     # there could be conflicts. As I understand the behavior of the Apache child
82 :     # this cannot occur -- a child finishes with one request before obtaining the next
83 : sh002i 1050
84 :     # DOCUMENT must come early in every .pg file, before any answers or text are
85 :     # defined. It initializes the variables.
86 :     # It can appear only once.
87 :    
88 :     =head2 DOCUMENT()
89 :    
90 :     C<DOCUMENT()> must be the first statement in each problem template. It can
91 :     only be used once in each problem.
92 :    
93 :     C<DOCUMENT()> initializes some empty variables and via C<INITIALIZE_PG()> unpacks the
94 :     variables in the C<%envir> variable which is implicitly passed to the problem. It must
95 :     be the first statement in any problem template. It
96 :     also unpacks any answers submitted and places them in the C<@submittedAnswer> list,
97 :     saves the problem seed in C<$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 1253
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 :     %main::gifs_created = ();
142 : malsyned 1280
143 : gage 1253 !);
144 : gage 1266 # 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 : gage 1304 #no strict;
148 : gage 1266 foreach my $var (keys %envir) {
149 :     eval(q!$main::!.$var.q! = $main::envir{!.$var.q!}! ); #whew!! makes sure $var is interpolated but $main:: is evaluated at run time.
150 :     # warn eval(q! "var $var is defined ". $main::!.$var);
151 :     warn "Problem defining ", q{\$main::}.$var, " while initializing the PG problem: $@" if $@;
152 :     }
153 : gage 1304 #use strict;
154 :     #FIXME these strict pragmas don't seem to be needed and they cause trouble in perl 5.6.0
155 : sh002i 1050
156 : gage 1266
157 :    
158 : gage 1253 eval(q!
159 :     @main::submittedAnswers = @{$main::refSubmittedAnswers} if defined($main::refSubmittedAnswers);
160 :     $main::PG_original_problemSeed = $main::problemSeed;
161 :     $main::PG_random_generator = new PGrandom($main::problemSeed) || die "Can't create random number generator.";
162 :     $main::ans_rule_count = 0; # counts questions
163 : lr003k 1122
164 : gage 1253 # end unpacking of environment variables.
165 :     $main::QUIZ_PREFIX = '' unless defined($main::QUIZ_PREFIX)
166 :    
167 :     !);
168 : gage 1266 # @main::submittedAnswers = @{$main::refSubmittedAnswers} if defined($main::refSubmittedAnswers);
169 :     # $main::PG_original_problemSeed = $main::problemSeed;
170 :     # $main::PG_random_generator = new PGrandom($main::problemSeed) || die "Can't create random number generator.";
171 :     # $main::ans_rule_count = 0; # counts questions
172 : sh002i 1050
173 :     # end unpacking of environment variables.
174 : gage 1266 # $main::QUIZ_PREFIX = '' unless defined($main::QUIZ_PREFIX)
175 : gage 1253
176 : sh002i 1050 }
177 :    
178 : gage 1266 sub inc_ans_rule_count {
179 :     eval(q!++$main::ans_rule_count!); # evalute at runtime to get correct main::
180 :     }
181 : sh002i 1050 # HEADER_TEXT is for material which is destined to be placed in the header of the html problem -- such
182 :     # as javaScript code.
183 :    
184 :     =head2 HEADER_TEXT()
185 :    
186 :    
187 :     HEADER_TEXT("string1", "string2", "string3");
188 :    
189 :     The C<HEADER_TEXT()>
190 :     function concatenates its arguments and places them in the output
191 :     header text string. It is used for material which is destined to be placed in
192 :     the header of the html problem -- such as javaScript code.
193 :     It can be used more than once in a file.
194 :    
195 :    
196 :     =cut
197 :    
198 :     sub HEADER_TEXT {
199 :     my @in = @_;
200 :     $STRINGforHEADER_TEXT .= join(" ",@in);
201 :     }
202 :    
203 :     # TEXT is the function which defines text which will appear in the problem.
204 :     # All text must be an argument to this function. Any other statements
205 :     # are calculations (done in perl) which will not directly appear in the
206 :     # output. Think of this as the "print" function for the .pg language.
207 :     # It can be used more than once in a file.
208 :    
209 :     =head2 TEXT()
210 :    
211 :     TEXT("string1", "string2", "string3");
212 :    
213 :     The C<TEXT()> function concatenates its arguments and places them in the output
214 :     text string. C<TEXT()> is the function which defines text which will appear in the problem.
215 :     All text must be an argument to this function. Any other statements
216 :     are calculations (done in perl) which will not directly appear in the
217 :     output. Think of this as the "print" function for the .pg language.
218 :     It can be used more than once in a file.
219 :    
220 :     =cut
221 :    
222 :     sub TEXT {
223 :     my @in = @_;
224 :     $STRINGforOUTPUT .= join(" ",@in);
225 :     }
226 :    
227 :    
228 :    
229 :     =head2 ANS()
230 :    
231 :     ANS(answer_evaluator1, answer_evaluator2, answer_evaluator3,...)
232 :    
233 :     Places the answer evaluators in the unlabeled answer_evaluator queue. They will be paired
234 :     with unlabeled answer rules (answer entry blanks) in the order entered. This is the standard
235 :     method for entering answers.
236 :    
237 :     LABELED_ANS(answer_evaluater_name1, answer_evaluator1, answer_evaluater_name2,answer_evaluator2,...)
238 :    
239 :     Places the answer evaluators in the labeled answer_evaluator hash. This allows pairing of
240 :     labeled answer evaluators and labeled answer rules which may not have been entered in the same
241 :     order.
242 :    
243 :     =cut
244 :    
245 :     sub ANS{ # store answer evaluators which have not been explicitly labeled
246 :     my @in = @_;
247 :     while (@in ) {
248 :     warn("<BR><B>Error in ANS:$in[0]</B> -- inputs must be references to
249 :     subroutines<BR>")
250 :     unless ref($in[0]);
251 :     push(@PG_ANSWERS, shift @in );
252 :     }
253 :     }
254 :     sub LABELED_ANS { #a better alias for NAMED_ANS
255 :     &NAMED_ANS;
256 :     }
257 :    
258 :     sub NAMED_ANS{ # store answer evaluators which have been explicitly labeled (submitted in a hash)
259 :     my @in = @_;
260 :     while (@in ) {
261 :     my $label = shift @in;
262 : malsyned 1280 $label = eval(q!$main::QUIZ_PREFIX.$label!);
263 : sh002i 1050 my $ans_eval = shift @in;
264 :     TEXT("<BR><B>Error in NAMED_ANS:$in[0]</B>
265 :     -- inputs must be references to subroutines<BR>")
266 :     unless ref($ans_eval);
267 :     $PG_ANSWERS_HASH{$label}= $ans_eval;
268 :     }
269 :     }
270 :     sub RECORD_ANS_NAME { # this maintains the order in which the answer rules are printed.
271 :     my $label = shift;
272 : malsyned 1280 eval(q!push(@main::PG_ANSWER_ENTRY_ORDER, $label)!);
273 : sh002i 1050 $label;
274 :     }
275 :    
276 :     sub NEW_ANS_NAME { # this keeps track of the answers which are entered implicitly,
277 :     # rather than with a specific label
278 :     my $number=shift;
279 : malsyned 1280 my $prefix = eval(q!$main::QUIZ_PREFIX.$main::ANSWER_PREFIX!);
280 :     my $label = $prefix.$number;
281 : sh002i 1050 push(@PG_UNLABELED_ANSWERS,$label);
282 :     $label;
283 :     }
284 :     sub ANS_NUM_TO_NAME { # This converts a number to an answer label for use in
285 :     # radio button and check box answers. No new answer
286 :     # name is recorded.
287 :     my $number=shift;
288 : malsyned 1280 my $label = eval(q!$main::QUIZ_PREFIX$main::ANSWER_PREFIX$number"!);
289 : sh002i 1050 $label;
290 :     }
291 :    
292 : lr003k 1122 my $vecnum;
293 :    
294 :     sub NEW_ANS_ARRAY_NAME { # this keeps track of the answers which are entered implicitly,
295 :     # rather than with a specific label
296 :     my $number=shift;
297 :     $vecnum = 0;
298 :     my $row = shift;
299 :     my $col = shift;
300 :     my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
301 :     push(@PG_UNLABELED_ANSWERS,$label);
302 :     $label;
303 :     }
304 :    
305 :     sub NEW_ANS_ARRAY_NAME_EXTENSION { # this keeps track of the answers which are entered implicitly,
306 :     # rather than with a specific label
307 :     my $number=shift;
308 :     my $row = shift;
309 :     my $col = shift;
310 :     if( $row == 0 && $col == 0 ){
311 :     $vecnum += 1;
312 :     }
313 :     my $label = "ArRaY"."$number"."["."$vecnum".","."$row".","."$col"."]";
314 : lr003k 1365 eval(q!push(@main::KEPT_EXTRA_ANSWERS, $label)!);#put the labels into the hash to be caught later for recording purposes
315 : lr003k 1122 $label;
316 :     }
317 :    
318 : sh002i 1050 # ENDDOCUMENT must come at the end of every .pg file.
319 :     # It exports the resulting text of the problem, the text to be used in HTML header material
320 :     # (for javaScript), the list of answer evaluators and any other flags. It can appear only once and
321 :     # it MUST be the last statement in the problem.
322 :    
323 :     =head2 ENDDOCUMENT()
324 :    
325 :     ENDDOCUMENT() must the last executable statement in any problem template. It can
326 :     only appear once. It returns
327 :     an array consisting of
328 :    
329 :     A reference to a string containing the rendered text of the problem.
330 :     A reference to a string containing text to be placed in the header
331 :     (for javaScript)
332 :     A reference to the array containing the answer evaluators.
333 :     (May be changed to a hash soon.)
334 :     A reference to an associative array (hash) containing various flags.
335 :    
336 :     The following flags are set by ENDDOCUMENT:
337 :     (1) showPartialCorrectAnswers -- determines whether students are told which
338 :     of their answers in a problem are wrong.
339 :     (2) recordSubmittedAnswers -- determines whether students submitted answers
340 :     are saved.
341 :     (3) refreshCachedImages -- determines whether the cached image of the problem
342 :     in typeset mode is always refreshed (i.e. setting this to 1 means cached
343 :     images are not used).
344 :     (4) solutionExits -- indicates the existence of a solution.
345 :     (5) hintExits -- indicates the existence of a hint.
346 :     (6) showHintLimit -- determines the number of attempts after which hint(s) will be shown
347 :    
348 :     (7) PROBLEM_GRADER_TO_USE -- chooses the problem grader to be used in this order
349 :     (a) A problem grader specified by the problem using:
350 :     install_problem_grader(\&grader);
351 :     (b) One of the standard problem graders defined in PGanswermacros.pl when set to
352 :     'std_problem_grader' or 'avg_problem_grader' by the environment variable
353 :     $PG_environment{PROBLEM_GRADER_TO_USE}
354 :     (c) A subroutine referenced by $PG_environment{PROBLEM_GRADER_TO_USE}
355 :     (d) The default &std_problem_grader defined in PGanswermacros.pl
356 :    
357 :    
358 :     =cut
359 :    
360 :     sub ENDDOCUMENT {
361 :    
362 :     my $index=0;
363 :     foreach my $label (@PG_UNLABELED_ANSWERS) {
364 :     if ( defined($PG_ANSWERS[$index]) ) {
365 :     $PG_ANSWERS_HASH{"$label"}= $PG_ANSWERS[$index];
366 : malsyned 1280 #warn "recording answer label = $label";
367 : sh002i 1050 } else {
368 :     warn "No answer provided by instructor for answer $label";
369 :     }
370 :     $index++;
371 :     }
372 :    
373 :     $STRINGforOUTPUT .="\n";
374 : gage 1266 eval q{ #make sure that "main" points to the current safe compartment by evaluating these lines.
375 : sh002i 1050 $main::PG_FLAGS{'showPartialCorrectAnswers'} = $main::showPartialCorrectAnswers;
376 :     $main::PG_FLAGS{'recordSubmittedAnswers'} = $main::recordSubmittedAnswers;
377 :     $main::PG_FLAGS{'refreshCachedImages'} = $main::refreshCachedImages;
378 :     $main::PG_FLAGS{'hintExists'} = $main::hintExists;
379 :     $main::PG_FLAGS{'showHintLimit'} = $main::showHint;
380 :     $main::PG_FLAGS{'solutionExists'} = $main::solutionExists;
381 :     $main::PG_FLAGS{ANSWER_ENTRY_ORDER} = \@main::PG_ANSWER_ENTRY_ORDER;
382 : lr003k 1365 $main::PG_FLAGS{KEPT_EXTRA_ANSWERS} = \@main::KEPT_EXTRA_ANSWERS;##need to keep array labels that don't call "RECORD_ANS_NAME"
383 : sh002i 1050 $main::PG_FLAGS{ANSWER_PREFIX} = $main::ANSWER_PREFIX;
384 :     # install problem grader
385 :     if (defined($main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) ) {
386 :     # problem grader defined within problem -- no further action needed
387 :     } elsif ( defined( $main::envir{PROBLEM_GRADER_TO_USE} ) ) {
388 :     if (ref($main::envir{PROBLEM_GRADER_TO_USE}) eq 'CODE' ) { # user defined grader
389 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = $main::envir{PROBLEM_GRADER_TO_USE};
390 :     } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'std_problem_grader' ) {
391 :     if (defined(&std_problem_grader) ){
392 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
393 :     } # std_problem_grader is the default in any case so don't give a warning.
394 :     } elsif ($main::envir{PROBLEM_GRADER_TO_USE} eq 'avg_problem_grader' ) {
395 :     if (defined(&avg_problem_grader) ){
396 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&avg_problem_grader; # defined in PGanswermacros.pl
397 :     }
398 :     #else { # avg_problem_grader will be installed by PGtranslator so there is no need for a warning.
399 :     # warn "The problem grader 'avg_problem_grader' has not been defined. Has PGanswermacros.pl been loaded?";
400 :     #}
401 :     } else {
402 :     warn "Error: $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} is not a known program grader.";
403 :     }
404 :     } elsif (defined(&std_problem_grader)) {
405 :     $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = \&std_problem_grader; # defined in PGanswermacros.pl
406 :     } else {
407 :     # PGtranslator will install its default problem grader
408 :     }
409 : gage 1266
410 : sh002i 1050 warn "ERROR: The problem grader is not a subroutine" unless ref( $main::PG_FLAGS{PROBLEM_GRADER_TO_USE}) eq 'CODE'
411 :     or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'std_problem_grader'
412 :     or $main::PG_FLAGS{PROBLEM_GRADER_TO_USE} = 'avg_problem_grader';
413 :     # return results
414 : gage 1266 };
415 : malsyned 1280
416 : gage 1266 (\$STRINGforOUTPUT, \$STRINGforHEADER_TEXT,\%PG_ANSWERS_HASH,eval(q!\%main::PG_FLAGS!));
417 : sh002i 1050 }
418 :    
419 :    
420 :    
421 :     =head2 INITIALIZE_PG()
422 :    
423 :     This is executed each C<DOCUMENT()> is called. For backward compatibility
424 :     C<loadMacros> also checks whether the C<macroDirectory> has been defined
425 :     and if not, it runs C<INITIALIZE_PG()> and issues a warning.
426 :    
427 :     =cut
428 :    
429 :    
430 :     1;

aubreyja at gmail dot com
ViewVC Help
Powered by ViewVC 1.0.9