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Fixed problem in dangerousMacros.pl defining i so that it can be used as a complex number. Fixed htmlLink so that it gives a friendly error message about broken links when fed an undefined url.
1 #!/usr/local/bin/webwork-perl 2 3 4 #################################################################### 5 # Copyright @ 1995-1999 University of Rochester 6 # All Rights Reserved 7 #################################################################### 8 9 #################################################################### 10 # 11 # dangerousMacros.pl contains macros with potentially dangerous commands 12 # such as require and eval. They can reference disk files for reading and 13 # writing and can create links. It may be necessary to modify certain addresses 14 # in this file to make the scripts run in different environments. 15 # 16 # 17 18 =head1 NAME 19 20 dangerousMacros.pl --- located in the courseScripts directory 21 22 =head1 SYNPOSIS 23 24 loadMacros(macrofile1,macrofile2,...) 25 26 insertGraph(graphObject); 27 returns a path to the file containing the graph image. 28 29 tth(texString) 30 returns an HTML version of the tex code passed to it. 31 32 alias(pathToFile); 33 returns URL which links to that file 34 35 36 =head1 DESCRIPTION 37 38 39 C<dangerousMacros.pl> contains macros with potentially dangerous commands 40 such as require and eval. They can reference disk files for reading and 41 writing and can create links. It may be necessary to modify certain addresses 42 in this file to make the scripts run properly in different environments. 43 44 C<dangerousMacros.pl> is loaded and reinitialized 45 every time a new problem is rendered. 46 47 =cut 48 49 50 ######## Dangerous macros######### 51 ## The macros in this file are defined while the safe compartment is wide open. 52 ## Be careful! 53 ######################################### 54 55 56 =head2 Sharing modules: 57 58 Most modules are loaded by dangerousMacros.pl 59 60 The modules must be loaded using require (not use) since the courseScriptsDirectory is 61 defined at run time. 62 63 64 The following considerations come into play. 65 66 * One needs to limit the access to modules for safety -- hence only 67 modules in the F<courseScriptsDirectory> can be loaded. 68 69 * Loading them in dangerousMacros.pl is wasteful, since the modules 70 would need to be reloaded everytime a new safe compartment is created. 71 (I believe that using require takes care of this.) 72 73 * Loading GD within a safeCompartment creates infinite recurrsion in AUTOLOAD (probably a bug) 74 hence this module is loaded by translate.pl and then shared with 75 the safe compartment. 76 77 * Other modules loaded by translate.pl are C<Exporter> and C<DynaLoader. 78 79 * PGrandom is loaded by F<PG.pl> , since it is needed there. 80 81 82 83 The module name spaces loaded in dangerousMacros are: 84 85 PGrandom (if not previously loaded) 86 WWPlot 87 Fun 88 Label 89 Circle 90 91 in addition the subroutine &evaluate_units is shared from the module Units. 92 93 =cut 94 95 96 97 98 99 BEGIN { 100 be_strict(); # an alias for use strict. This means that all global variable must contain main:: as a prefix. 101 } 102 sub _dangerousMacros_init { 103 } 104 105 sub _dangerousMacros_export { 106 my @EXPORT= ( 107 '&_dangerousMacros_init', 108 '&alias', 109 '&compile_file', 110 '&insertGraph', 111 '&loadMacros', 112 '&HEADER_TEXT', 113 '&sourceAlias', 114 '&tth', 115 ); 116 @EXPORT; 117 } 118 119 120 =head2 loadMacros 121 122 C<loadMacros(macrofile1,macrofile2,...)> 123 124 loadMacros takes a list of file names and evaluates the contents of each file. This is used to load macros 125 which define and augment the PG language. The macro files are first searched for in the macro 126 directory of the course C<($macroDirectory)> and then, if not found, in the WeBWorK courseScripts 127 directory C<($courseScriptsDirectory)> where the default behavior of the PG language is defined. 128 129 An individual course can modify the PG language, B<for that course only>, by 130 duplicating one of the macro files in the courseScripts directory and placing this 131 file in the macro directory for the course. The new file in the course 132 macro directory will now be used instead of the file in the courseScripts directory. 133 134 The new file in the course macro directory can by modified by adding macros or modifying existing macros. 135 136 I< Modifying macros is for users with some experience.> 137 138 Modifying existing macros might break other standard macros or problems which depend on the 139 unmodified behavior of these macors so do this with great caution. 140 In addition problems which use new macros defined in these files or which depend on the 141 modified behavior of existing macros will not work in other courses unless the macros are also 142 transferred to the new course. It helps to document the problems by indicating any special macros 143 which the problems require. 144 145 There is no facility for modifying or overloading a single macro. The entire file containing the macro 146 must be overloaded. 147 148 Modifications to files in the course macros directory affect only that course, 149 they will not interfere with the normal behavior of B<WeBWorK> in other courses. 150 151 152 153 =cut 154 155 # Global variables used 156 # ${main::macroDirectory} 157 # ${main::courseScriptsDirectory} 158 # Global macros used 159 # None 160 161 # Because of the need to use the directory variables it is tricky to define this 162 # in translate.pl since, as currently written, the directories are not available 163 # at that time. Perhaps if I rewrite translate as an object that method will work. 164 165 # The only difficulty with defining loadMacros inside the Safe compartment is that 166 # the error reporting does not work with syntax errors. 167 # A kludge using require works around this problem 168 169 170 my ($macroDirectory, 171 $courseScriptsDirectory, 172 $templateDirectory, 173 $scriptDirectory, 174 ); 175 176 sub loadMacros { 177 my @files = @_; 178 my $fileName; 179 ############################################################################### 180 # At this point the directories have been defined from %envir and we can define 181 # the directories for this file 182 ############################################################################### 183 184 $macroDirectory = eval('$main::macroDirectory') unless defined($macroDirectory); 185 $courseScriptsDirectory = eval('$main::courseScriptsDirectory') unless defined($courseScriptsDirectory); 186 $templateDirectory = eval('$main::courseScriptsDirectory') unless defined($templateDirectory); 187 $scriptDirectory = eval('$main::scriptDirectory') unless defined($scriptDirectory); 188 189 # Hack to handle those problems where DOCUMENT() comes after loadMacros. 190 unless (defined( $macroDirectory)) { 191 warn "The macroDirectory |$macroDirectory| variable was not initialized.\n" , 192 " Please make sure that the DOCUMENT() statement comes before\n" , 193 " the loadMacros() statement in the problem template." 194 } 195 while (@files) { 196 $fileName = shift @files; 197 next if ($fileName =~ /^PG.pl$/) ; # the PG.pl macro package is already loaded. 198 199 my $macro_file_name = $fileName; 200 $macro_file_name =~s/\.pl//; # trim off the extenstion 201 my $init_subroutine_name = "_${macro_file_name}_init"; 202 my $macro_file_loaded; 203 #no strict; 204 ############################################################################### 205 # For some reason the "no stict" which works on webwork-db doesn't work on 206 # webwork. For this reason the constuction &{$init_subroutine_name} 207 # was abandoned and replaced by eval. This is considerably more dangerous 208 # since one could hide something nasty in a file name. 209 # Keep an eye on this ??? 210 # webwork-db used perl 5.6.1 and webwork used perl 5.6.0 It seems 211 # unlikely that this was the problem. Otherwise all files seemed to 212 # be the same. 213 ############################################################################### 214 215 local($temp::rf_init_subroutine); 216 eval qq{ \$temp::rf_init_subroutine = \\&main::$init_subroutine_name;}; 217 218 219 220 221 222 $macro_file_loaded = defined($temp::rf_init_subroutine) && defined( &{$temp::rf_init_subroutine} ); 223 224 # macros are searched for first in the $macroDirectory of the course 225 # and then in the webwork $courseScripts directory. 226 unless ($macro_file_loaded) { 227 #print "loading macro file $fileName\n"; 228 if (-r "${main::macroDirectory}$fileName") { 229 compile_file("${main::macroDirectory}$fileName"); 230 231 } elsif (-r "${main::courseScriptsDirectory}$fileName" ) { 232 compile_file("${main::courseScriptsDirectory}$fileName"); 233 } else { 234 die "Can't locate macro file via path: |${main::macroDirectory}$fileName| or |${main::courseScriptsDirectory}$fileName|"; 235 } 236 } 237 if ( defined($temp::rf_init_subroutine) and defined( &{$temp::rf_init_subroutine} ) ) { 238 #print " &$init_subroutine_name defined = ", $macro_file_loaded,"\n"; 239 &{$temp::rf_init_subroutine}(); #initialize file 240 #print "initializing $init_subroutine_name\n"; 241 } 242 243 } 244 } 245 246 # errors in compiling macros is not always being reported. 247 sub compile_file { 248 my $filePath = shift; 249 local(*MACROFILE); 250 local($/); 251 $/ = undef; # allows us to treat the file as a single line 252 open(MACROFILE, "<$filePath") || die "Cannot open file: $filePath"; 253 my $string = <MACROFILE>; 254 my ($result,$error,$fullerror) = PG_restricted_eval($string); 255 if ($error) { # the $fullerror report has formatting and is never empty 256 $fullerror =~ s/\(eval \d+\)/ $filePath\n/; # attempt to insert file name instead of eval number 257 die "Error detected while loading $filePath:\n$fullerror"; 258 259 } 260 261 close(MACROFILE); 262 263 } 264 265 # This creates on the fly graphs 266 267 =head2 insertGraph 268 269 $filePath = insertGraph(graphObject); 270 returns a path to the file containing the graph image. 271 272 insertGraph(graphObject) writes a gif file to the C<html/tmp/gif> directory of the current course. 273 The file name 274 is obtained from the graphObject. Warnings are issued if errors occur while writing to 275 the file. 276 277 The permissions and ownership of the file are controlled by C<$main::tmp_file_permission> 278 and C<$main::numericalGroupID>. 279 280 B<Returns:> A string containing the full path to the temporary file containing the GIF image. 281 282 283 284 InsertGraph draws the object $graph, stores it in "${tempDirectory}gif/$gifName.gif (or .png)" where 285 the $imageName is obtained from the graph object. ConvertPath and surePathToTmpFile are used to insure 286 that the correct directory separators are used for the platform and that the necessary directories 287 are created if they are not already present. 288 289 The directory address to the file is the result. This is most often used in the construct 290 291 TEXT(alias(insertGraph($graph)) ); 292 293 where alias converts the directory address to a URL when serving HTML pages and insures that 294 an eps file is generated when creating TeX code for downloading. 295 296 =cut 297 298 # Global variables used: 299 # $main::tmp_file_permission, 300 # $main::numericalGroupID 301 302 #Global macros used: 303 # &convertPath 304 # &surePathToTmpFile 305 306 sub insertGraph { 307 # Convert the image to GIF and print it on standard output 308 my $graph = shift; 309 my $extension = ($WWPlot::use_png) ? '.png' : '.gif'; 310 my $fileName = $graph->imageName . $extension; 311 my $filePath = convertPath("gif/$fileName"); 312 $filePath = &surePathToTmpFile( $filePath ); 313 #createFile($filePath, $main::tmp_file_permission, $main::numericalGroupID); 314 local(*OUTPUT); # create local file handle so it won't overwrite other open files. 315 open(OUTPUT, ">$filePath")||warn ("$0","Can't open $filePath<BR>",""); 316 chmod( 0777, $filePath); 317 print OUTPUT $graph->draw|| warn("$0","Can't print graph to $filePath<BR>",""); 318 close(OUTPUT)||warn("$0","Can't close $filePath<BR>",""); 319 $filePath; 320 } 321 322 323 324 =head2 tth 325 326 tth(texString) 327 returns an HTML version of the tex code passed to it. 328 329 This macro sends the texString to the filter program C<tth> created by Ian Hutchinson. 330 The tth program was created by Ian Hutchinson and is freely available 331 for B<non-commerical purposes> at the C<tth> main site: C<http://hutchinson.belmont.ma.us/tth/>. 332 333 The purpose of C<tth> is to translate text in the TeX or Latex markup language into 334 HTML markup as best as possible. Some symbols, such as square root symbols are not 335 translated completely. Macintosh users must use the "MacRoman" encoding (available in 4.0 and 336 higher browsers) in order to view the symbols correctly. WeBWorK attempts to force Macintosh 337 browsers to use this encoding when such a browser is detected. 338 339 The contents of the file C<tthPreamble.tex> in the courses template directory are prepended 340 to each string. This allows one to define TeX macros which can be used in every problem. 341 Currently there is no default C<tthPreamble.tex> file, so if the file is not present in the 342 course template directory no TeX macro definitions are prepended. C<tth> already understands most 343 Latex commands, but will not, in general know I<AMS-Latex> commands. Additional information 344 on C<tth> is available at the C<tth> main site. 345 346 This macro contains code which is system dependent and may need to be modified 347 to run on different systems. 348 349 =for html 350 The link to <CODE>tth</CODE> for <STRONG>non-commerical</STRONG> is 351 <A HREF="http://hutchinson.belmont.ma.us/tth/">http://hutchinson.belmont.ma.us/tth/</A>. 352 Binaries for many operating systems are available as well as the source code. Links 353 describing how to obtain <CODE>tth</CODE> for commerical use are also available on this page. 354 355 =cut 356 357 358 359 # This file allows the tth display. 360 # Global variables: 361 # ${main::templateDirectory}tthPreamble.tex # location of any preamble TeX commands for tth 362 # ${main::templateDirectory} 363 # ${main::scriptDirectory}tth # path to tth application 364 # Global macros: 365 # None 366 367 my ($tthPreambleFile, $tthPreambleContents); # the contents of this file will not change during problem compilation 368 # it only needs to be read once 369 sub tth { 370 my $inputString = shift; 371 372 # read the contents of the tthPreamble.tex file, unless it has already been read 373 unless ( defined( $tthPreambleContents) ) { 374 $tthPreambleFile = "${main::templateDirectory}tthPreamble.tex" if ( -r "${main::templateDirectory}tthPreamble.tex" ); 375 if ( defined($tthPreambleFile) ) { 376 local(*TTHIN); 377 open (TTHIN, "${main::templateDirectory}tthPreamble.tex") || die "Can't open file ${main::templateDirectory}tthPreamble.tex"; 378 #my @tthPreambleArray = <TTHIN>; 379 local($/); 380 $/ = undef; 381 $tthPreambleContents = <TTHIN>;#join("",@tthPreambleArray); 382 close(TTHIN); 383 384 $tthPreambleContents =~ s/(.)\n/$1%\n/g; # thanks to Jim Martino 385 # each line in the definition file 386 # should end with a % to prevent 387 # adding supurious paragraphs to output. 388 389 $tthPreambleContents .="%\n"; # solves the problem if the file doesn't end with a return. 390 391 } else { 392 $tthPreambleContents = ""; 393 } 394 } 395 396 $inputString = $tthPreambleContents . $inputString; 397 $inputString = "<<END_OF_TTH_INPUT_STRING;\n\n\n" . $inputString . "\nEND_OF_TTH_INPUT_STRING\necho \"\" >/dev/null"; #it's not clear why another command is needed. 398 ##WARNING -- how should we get the value of $scriptDirectory to this macro? 399 ## perhaps tth belongs in displayMacros??? 400 my $tthpath = "/usr/local/bin/tth"; 401 my $out; 402 403 if (-x $tthpath ) { 404 my $tthcmd = "$tthpath -L -f5 -r 2>/dev/null " . $inputString; 405 if (open(TTH, "$tthcmd |")) { 406 local($/); 407 $/ = undef; 408 $out = <TTH>; 409 $/ = "\n"; 410 close(TTH); 411 }else { 412 $out = "<BR>there has been an error in executing $tthcmd<BR>"; 413 } 414 } else { 415 $out = "<BR> Can't execute the program tth at |$tthpath|<BR>"; 416 } 417 418 $out; 419 } 420 421 422 423 =head2 alias 424 425 alias(pathToFile); 426 returns A string describing the URL which links to GIF or html file 427 (in HTML and Latex2HTML modes). 428 or a path to the appropriate eps version of a GIF file 429 (TeX Mode) 430 431 432 433 C<alias> allows you to refer to auxiliary files which are in a directory along with 434 the problem definition. In addition alias creates an eps copy of GIF files when 435 downloading hard copy (TeX mode). 436 437 As a rule auxiliary files that are used by 438 a number of problems in a course should be placed in C<html/gif> or C<html> 439 or in a subdirectory of the C<html> directory, 440 while auxiliary files which are used in only one problem should be placed in 441 the same directory as the problem in order to make the problem more portable. 442 443 444 445 =over 4 446 447 =item Files in the html subdirectory 448 449 B<When not in TeX mode:> 450 451 If the file lies under the C<html> subdirectory, then the approriate URL for the file is created. 452 Since the C<html> subdirectory is already accessible to the webserver no other changes need to be made. 453 The file path for this type of file should be the complete file path. The path should 454 start with the prefix defined in $Global:htmlDirectory. 455 456 B<When in TeX mode:> 457 458 459 GIF files will be translated into an eps file (using system dependent code) 460 and placed in the directory C<tmp/eps>. The full path to this file is returned 461 for use by TeX in producing the hard copy. (This should work even in a chrooted 462 environment.) in producing the hard copy. (This should work even in a chrooted 463 environment.) 464 465 The conversion is done by a system dependent script 466 called C<gif2eps> which should be in the scripts directory 467 468 The URL's for the other files are produced as in non-tex mode 469 but will of course not be active. 470 471 =item Files in the tmp subdirectory 472 473 B<When not in TeX mode:> 474 475 If the file lies under the C<tmp> subdirectory, then the approriate URL for the file is created. 476 Since the C<tmp> subdirectory is already accessible to the webserver no other changes need to be made. 477 The file path for this type of file should be the complete file path. The path should 478 start with the prefix defined in $Global:tempDirectory. 479 480 B<When in TeX mode:> 481 482 483 GIF files will be translated into an eps file (using system dependent code) 484 and placed in the directory C<tmp/eps>. The full path to this file is returned 485 for use by TeX in producing the hard copy. (This should work even in a chrooted 486 environment.) 487 488 The conversion is done by a system dependent script 489 called C<gif2eps> which should be in the scripts directory 490 491 The URL's for the other files are produced as in non-tex mode 492 but will of course not be active. 493 494 =item Files in the course template subdirectory: 495 496 B<When not in TeX mode:> 497 498 If the file lies under the course templates subdirectory, 499 it is assumed to lie in subdirectory rooted in the directory 500 containing the problem template file. 501 An alias is created under the C<html/tmp/gif> or 502 C<html/tmp/html> directory and linked to the original file. 503 The file path for this type of file is a relative 504 path rooted at the directory containing the problem template file. 505 506 B<When in TeX mode:> 507 508 GIF files will be translated into an eps file (using system dependent code) 509 and placed in the directory C<html/tmp/eps>. The full path to this file is returned 510 for use by TeX in producing the hard copy. (This should work even in a chrooted 511 environment.) 512 513 The conversion is done by a system dependent script 514 called C<gif2eps> which should be in the scripts directory 515 516 The URL's for the other files are produced as in non-tex mode 517 but will of course not be active. 518 519 =back 520 521 =cut 522 523 524 525 # Currently gif, html and types are supported. 526 # 527 # If the auxiliary file path has not extension then the extension .gif isassumed. 528 # 529 # If the auxiliary file path leads to a file in the ${Global::htmlDirectory} 530 # no changes are made to the file path. 531 # 532 # If the auxiliary file path is not complete, than it is assumed that it refers 533 # to a subdirectoy of the directory containing the problem.. 534 # 535 # The output is either the correct URL for the file 536 # or (in TeX mode) the complete path to the eps version of the file 537 # and can be used as input into the image macro. 538 # 539 # surePathToTmpFile takes a path and outputs the complete path: 540 # ${main::htmlDirectory}/tmp/path 541 # It insures that all of the directories in the path have been created, 542 # but does not create the 543 # final file. 544 545 # For postscript printing, alias generates an eps version of the gif image and places 546 # it in the directory eps. This slows down downloading postscript versions somewhat, 547 # but not excessivevly. 548 # Alias does not do any garbage collection, so files and alias may accumulate and 549 # need to be removed manually or by a reaper daemon. 550 551 552 # Global variables used: 553 # $main::fileName # the full path to the current problem template file 554 # $main::htmlDirectory 555 # $main::htmlURL 556 # $main::tempDirectory 557 # $main::tempURL 558 # $main::studentLogin 559 # $main::psvnNumber 560 # $main::setNumber 561 # $main::probNum 562 # $main::displayMode 563 564 # Global macros used 565 # gif2eps An external file called by system 566 # surePathToTmpFile 567 # convertPath 568 # directoryFromPath 569 570 571 # This subroutine has commands which will not work on non-UNIX environments. 572 # system("cat $gifSourceFile | /usr/math/bin/giftopnm | /usr/math/bin/pnmdepth 1 | /usr/math/bin/pnmtops -noturn>$adr_output") && 573 574 575 # local constants $User, $psvn $setNumber $probNum $displayMode 576 577 sub sourceAlias { 578 my $path_to_file = shift; 579 my ($user,$err,$errmsg) = PG_restricted_eval('$main::inputs_ref->{user}'); 580 $user = " " unless defined($user); 581 my ($out,$err2,$errmsg2) = PG_restricted_eval(q{"source.pl?probSetKey=$main::psvn". 582 "&probNum=$main::probNum" . 583 "&Mode=$main::displayMode" . 584 "&course=". $main::courseName . 585 "&user=" . $user . 586 "&displayPath=$path_to_file" . 587 "&key=". $main::sessionKey;} 588 ); 589 $out; 590 591 } 592 593 594 sub alias { 595 # input is a path to the original auxiliary file 596 unless ( defined($main::tempURL) ) { 597 PG_restricted_eval( q{ 598 $fileName = $main::fileName; 599 $htmlDirectory = $main::htmlDirectory; 600 $htmlURL = $main::htmlURL; 601 $tempDirectory = $main::tempDirectory; 602 $tempURL = $main::tempURL; 603 $studentLogin = $main::studentLogin; 604 $psvnNumber = $main::psvnNumber; 605 $setNumber = $main::setNumber; 606 $probNum = $main::probNum; 607 $displayMode = $main::displayMode; 608 }); 609 } 610 my $aux_file_path = shift @_; 611 warn "Empty string used as input into the function alias" unless $aux_file_path; 612 # problem specific data 613 warn "The path to the current problem file template is not defined." unless $main::fileName; 614 warn "The current studentLogin is not defined " unless $main::studentLogin; 615 warn "The current problem set number is not defined" if $main::setNumber eq ""; # allow for sets equal to 0 616 warn "The current problem number is not defined" if $main::probNum eq ""; 617 warn "The current problem set version number (psvn) is not defined" unless $main::psvnNumber; 618 warn "The displayMode is not defined" unless $main::displayMode; 619 # required macros 620 warn "The macro &surePathToTmpFile can't be found" unless defined(&surePathToTmpFile); 621 warn "The macro &convertPath can't be found" unless defined(&convertPath); 622 warn "The macro &directoryFromPath can't be found" unless defined(&directoryFromPath); 623 warn "Can't execute the gif2eps script at ${main::scriptDirectory}gif2eps" unless ( -x "${main::scriptDirectory}gif2eps" ); 624 warn "Can't execute the png2eps script at ${main::scriptDirectory}png2eps" unless ( -x "${main::scriptDirectory}png2eps" ); 625 # required directory addresses (and URL address) 626 warn "htmlDirectory is not defined in $main::htmlDirectory" unless $main::htmlDirectory; 627 warn "htmlURL is not defined in \$main::htmlURL" unless $main::htmlURL; 628 warn "tempURL is not defined in \$main::tempURL" unless $main::tempURL; 629 warn "The scripts directory is not defined in \$main::scriptDirectory" unless $main::scriptDirectory; 630 631 # determine extension, if there is one 632 #if extension exists, strip and use the value for $ext 633 # files without extensions are considered to be picture files: 634 635 my $ext; 636 if ($aux_file_path =~ s/\.([^\.]*)$// ) { 637 $ext = $1; 638 } else { 639 warn "This file name $aux_file_path did not have an extension.<BR> " . 640 "Every file name used as an argument to alias must have an extension.<BR> " . 641 "The permissable extensions are .gif, .png, and .html .<BR>"; 642 $ext = "gif"; 643 644 645 } 646 647 # $adr_output is a url in HTML and Latex2HTML modes 648 # and a complete path in TEX mode. 649 my $adr_output; 650 651 # in order to facilitate maintenance of this macro the routines for handling 652 # different file types are defined separately. This involves some redundancy 653 # in the code but it makes it easier to define special handling for a new file 654 # type, (but harder to change the behavior for all of the file types at once 655 # (sigh) ). 656 ##################################################### 657 # .html FILES in HTML, HTML_tth and Latex2HTML mode 658 ##################################################### 659 660 if ($ext eq 'html') { 661 # No changes are made for auxiliary files in the 662 # ${Global::htmlDirectory} subtree. 663 if ( $aux_file_path =~ m|^$main::tempDirectory| ) { 664 $adr_output = $aux_file_path; 665 $adr_output =~ s|$main::tempDirectory|$main::tempURL/|; 666 $adr_output .= ".$ext"; 667 } elsif ($aux_file_path =~ m|^$main::htmlDirectory| ) { 668 $adr_output = $aux_file_path; 669 $adr_output =~ s|$main::htmlDirectory|$main::htmlURL|; 670 $adr_output .= ".$ext"; 671 } else { 672 673 # HTML files not in the htmlDirectory are assumed under live under the 674 # templateDirectory in the same directory as the problem. 675 # Create an alias file (link) in the directory html/tmp/html which 676 # points to the original file and return the URL of this alias. 677 # Create all of the subdirectories of html/tmp/html which are needed 678 # using sure file to path. 679 # $fileName is obtained from environment for PGeval 680 # it gives the full path to the current problem 681 my $filePath = directoryFromPath($main::fileName); 682 my $htmlFileSource = convertPath("$main::templateDirectory${filePath}$aux_file_path.html"); 683 my $link = "html/$main::studentLogin-$main::psvnNumber-set$main::setNumber-prob$main::probNum-$aux_file_path.$ext"; 684 my $linkPath = surePathToTmpFile($link); 685 $adr_output = "${main::tempURL}$link"; 686 if (-e $htmlFileSource) { 687 if (-e $linkPath) { 688 unlink($linkPath) || warn "Unable to unlink alias file at |$linkPath|"; 689 # destroy the old link. 690 } 691 symlink( $htmlFileSource, $linkPath) || 692 warn "The macro alias cannot create a link from |$linkPath| to |$htmlFileSource| <BR>" ; 693 } else { 694 warn("The macro alias cannot find an HTML file at: |$htmlFileSource|"); 695 } 696 } 697 698 ##################################################### 699 # .gif FILES in HTML, HTML_tth, Latex2HTML and TeX modes 700 ##################################################### 701 702 } elsif ($ext eq 'gif') { 703 if ( $main::displayMode eq 'HTML' || 704 $main::displayMode eq 'HTML_tth'|| 705 $main::displayMode eq 'Latex2HTML') { 706 # warn "tempDirectory is $main::tempDirectory"; 707 # warn "file Path for auxiliary file is $aux_file_path"; 708 # No changes are made for auxiliary files in the htmlDirectory or in the tempDirectory subtree. 709 if ( $aux_file_path =~ m|^$main::tempDirectory| ) { 710 $adr_output = $aux_file_path; 711 $adr_output =~ s|$main::tempDirectory|$main::tempURL|; 712 $adr_output .= ".$ext"; 713 # warn "adress out is $adr_output"; 714 } elsif ($aux_file_path =~ m|^$main::htmlDirectory| ) { 715 $adr_output = $aux_file_path; 716 $adr_output =~ s|$main::htmlDirectory|$main::htmlURL|; 717 $adr_output .= ".$ext"; 718 } else { 719 # files not in the htmlDirectory sub tree are assumed to live under the templateDirectory 720 # subtree in the same directory as the problem. 721 # For a gif file the alias macro creates an alias under the html/images directory 722 # which points to the gif file in the problem directory. 723 # All of the subdirectories of html/tmp/gif which are needed are also created. 724 my $filePath = directoryFromPath($main::fileName); 725 726 # $fileName is obtained from environment for PGeval 727 # it gives the full path to the current problem 728 my $gifSourceFile = convertPath("$main::templateDirectory${filePath}$aux_file_path.gif"); 729 my $link = "gif/$main::studentLogin-$main::psvnNumber-set$main::setNumber-prob$main::probNum-$aux_file_path.$ext"; 730 my $linkPath = surePathToTmpFile($link); 731 $adr_output = "${main::tempURL}$link"; 732 #warn "linkPath is $linkPath"; 733 #warn "adr_output is $adr_output"; 734 if (-e $gifSourceFile) { 735 if (-e $linkPath) { 736 unlink($linkPath) || warn "Unable to unlink old alias file at $linkPath"; 737 } 738 739 symlink($gifSourceFile, $linkPath) || 740 warn "The macro alias cannot create a link from |$linkPath| to |$gifSourceFile| <BR>" ; 741 } else { 742 warn("The macro alias cannot find a GIF file at: |$gifSourceFile|"); 743 } 744 } 745 ##################################################### 746 # .gif FILES in TeX mode 747 ##################################################### 748 749 } elsif ($main::displayMode eq 'TeX') { 750 751 ################################################################################ 752 #### 753 ## This is statement used below is system dependent. 754 # Notice that the range of colors is restricted when converting to postscript to keep the files small 755 # "cat $gifSourceFile | /usr/math/bin/giftopnm |/usr/math/bin/pnmtops -noturn>$adr_output" 756 # "cat $gifSourceFile | /usr/math/bin/giftopnm | /usr/math/bin/pnmdepth 1 | /usr/math/bin/pnmtops -noturn>$adr_output" 757 #### 758 ################################################################################ 759 760 if ($aux_file_path =~ m|^$main::htmlDirectory| or $aux_file_path =~ m|^$main::tempDirectory|) { 761 762 # To serve an eps file copy an eps version of the gif file to the subdirectory of eps/ 763 my $linkPath = directoryFromPath($main::fileName); 764 765 my $gifSourceFile = "$aux_file_path.gif"; 766 my $gifFileName = fileFromPath($gifSourceFile); 767 $adr_output = surePathToTmpFile("$main::tempDirectory/eps/$main::studentLogin-$main::psvnNumber-$gifFileName.eps") ; 768 769 if (-e $gifSourceFile) { 770 #system("cat $gifSourceFile | /usr/math/bin/giftopnm | /usr/math/bin/pnmdepth 1 | /usr/math/bin/pnmtops -noturn>$adr_output") && 771 system("${main::scriptDirectory}gif2eps $gifSourceFile $adr_output" ) && 772 die "Unable to create eps file:\n |$adr_output| from file\n |$gifSourceFile|\n in problem $main::probNum " . 773 "using the system dependent script\n |${main::scriptDirectory}gif2eps| \n"; 774 775 } else { 776 die "|$gifSourceFile| cannot be found. Problem number: |$main::probNum|"; 777 } 778 779 } else { 780 # To serve an eps file copy an eps version of the gif file to a subdirectory of eps/ 781 my $filePath = directoryFromPath($main::fileName); 782 my $gifSourceFile = "${main::templateDirectory}${filePath}$aux_file_path.gif"; 783 #print "content-type: text/plain \n\nfileName = $fileName and aux_file_path =$aux_file_path<BR>"; 784 $adr_output = surePathToTmpFile("eps/$main::studentLogin-$main::psvnNumber-set$main::setNumber-prob$main::probNum-$aux_file_path.eps") ; 785 if (-e $gifSourceFile) { 786 #system("cat $gifSourceFile | /usr/math/bin/giftopnm | /usr/math/bin/pnmdepth 1 | /usr/math/bin/pnmtops -noturn>$adr_output") && 787 #warn "Unable to create eps file: |$adr_output|\n from file\n |$gifSourceFile|\n in problem $main::probNum"; 788 #warn "Help ${main::scriptDirectory}gif2eps" unless -x "${main::scriptDirectory}gif2eps"; 789 system("${main::scriptDirectory}gif2eps $gifSourceFile $adr_output" ) && 790 die "Unable to create eps file:\n |$adr_output| from file\n |$gifSourceFile|\n in problem $main::probNum " . 791 "using the system dependent script\n |${main::scriptDirectory}gif2eps| \n "; 792 793 794 } else { 795 die "|$gifSourceFile| cannot be found. Problem number: |$main::probNum|"; } 796 } 797 798 } else { 799 wwerror("Error in alias: dangerousMacros.pl","unrecognizable displayMode = $main::displayMode",""); 800 } 801 ##################################################### 802 # .png FILES in HTML, HTML_tth, Latex2HTML and TeX modes 803 ##################################################### 804 805 } elsif ($ext eq 'png') { 806 if ( $main::displayMode eq 'HTML' || 807 $main::displayMode eq 'HTML_tth'|| 808 $main::displayMode eq 'Latex2HTML') { 809 # warn "tempDirectory is $main::tempDirectory"; 810 # warn "file Path for auxiliary file is $aux_file_path"; 811 # No changes are made for auxiliary files in the htmlDirectory or in the tempDirectory subtree. 812 if ( $aux_file_path =~ m|^$main::tempDirectory| ) { 813 $adr_output = $aux_file_path; 814 $adr_output =~ s|$main::tempDirectory|$main::tempURL|; 815 $adr_output .= ".$ext"; 816 # warn "adress out is $adr_output"; 817 } elsif ($aux_file_path =~ m|^$main::htmlDirectory| ) { 818 $adr_output = $aux_file_path; 819 $adr_output =~ s|$main::htmlDirectory|$main::htmlURL|; 820 $adr_output .= ".$ext"; 821 } else { 822 # files not in the htmlDirectory sub tree are assumed to live under the templateDirectory 823 # subtree in the same directory as the problem. 824 # For a png file the alias macro creates an alias under the html/images directory 825 # which points to the png file in the problem directory. 826 # All of the subdirectories of html/tmp/gif which are needed are also created. 827 my $filePath = directoryFromPath($main::fileName); 828 829 # $fileName is obtained from environment for PGeval 830 # it gives the full path to the current problem 831 my $pngSourceFile = convertPath("$main::templateDirectory${filePath}$aux_file_path.png"); 832 my $link = "gif/$main::studentLogin-$main::psvnNumber-set$main::setNumber-prob$main::probNum-$aux_file_path.$ext"; 833 my $linkPath = surePathToTmpFile($link); 834 $adr_output = "${main::tempURL}$link"; 835 #warn "linkPath is $linkPath"; 836 #warn "adr_output is $adr_output"; 837 if (-e $pngSourceFile) { 838 if (-e $linkPath) { 839 unlink($linkPath) || warn "Unable to unlink old alias file at $linkPath"; 840 } 841 842 symlink($pngSourceFile, $linkPath) || 843 warn "The macro alias cannot create a link from |$linkPath| to |$pngSourceFile| <BR>" ; 844 } else { 845 warn("The macro alias cannot find a PNG file at: |$pngSourceFile|"); 846 } 847 } 848 ##################################################### 849 # .png FILES in TeX mode 850 ##################################################### 851 852 } elsif ($main::displayMode eq 'TeX') { 853 854 ################################################################################ 855 #### 856 ## This is statement used below is system dependent. 857 # Notice that the range of colors is restricted when converting to postscript to keep the files small 858 # "cat $pngSourceFile | /usr/math/bin/pngtopnm |/usr/math/bin/pnmtops -noturn>$adr_output" 859 # "cat $pngSourceFile | /usr/math/bin/pngtopnm | /usr/math/bin/pnmdepth 1 | /usr/math/bin/pnmtops -noturn>$adr_output" 860 #### 861 ################################################################################ 862 863 if ($aux_file_path =~ m|^$main::htmlDirectory| or $aux_file_path =~ m|^$main::tempDirectory|) { 864 865 # To serve an eps file copy an eps version of the png file to the subdirectory of eps/ 866 my $linkPath = directoryFromPath($main::fileName); 867 868 my $pngSourceFile = "$aux_file_path.png"; 869 my $pngFileName = fileFromPath($pngSourceFile); 870 $adr_output = surePathToTmpFile("$main::tempDirectory/eps/$main::studentLogin-$main::psvnNumber-$pngFileName.eps") ; 871 872 if (-e $pngSourceFile) { 873 #system("cat $pngSourceFile | /usr/math/bin/pngtopnm | /usr/math/bin/pnmdepth 1 | /usr/math/bin/pnmtops -noturn>$adr_output") && 874 system("${main::scriptDirectory}png2eps $pngSourceFile $adr_output" ) && 875 die "Unable to create eps file:\n |$adr_output| from file\n |$pngSourceFile|\n in problem $main::probNum " . 876 "using the system dependent script\n |${main::scriptDirectory}png2eps| \n"; 877 878 } else { 879 die "|$pngSourceFile| cannot be found. Problem number: |$main::probNum|"; 880 } 881 882 } else { 883 # To serve an eps file copy an eps version of the png file to a subdirectory of eps/ 884 my $filePath = directoryFromPath($main::fileName); 885 my $pngSourceFile = "${main::templateDirectory}${filePath}$aux_file_path.png"; 886 #print "content-type: text/plain \n\nfileName = $fileName and aux_file_path =$aux_file_path<BR>"; 887 $adr_output = surePathToTmpFile("eps/$main::studentLogin-$main::psvnNumber-set$main::setNumber-prob$main::probNum-$aux_file_path.eps") ; 888 if (-e $pngSourceFile) { 889 #system("cat $pngSourceFile | /usr/math/bin/pngtopnm | /usr/math/bin/pnmdepth 1 | /usr/math/bin/pnmtops -noturn>$adr_output") && 890 #warn "Unable to create eps file: |$adr_output|\n from file\n |$pngSourceFile|\n in problem $main::probNum"; 891 #warn "Help ${main::scriptDirectory}png2eps" unless -x "${main::scriptDirectory}png2eps"; 892 system("${main::scriptDirectory}png2eps $pngSourceFile $adr_output" ) && 893 die "Unable to create eps file:\n |$adr_output| from file\n |$pngSourceFile|\n in problem $main::probNum " . 894 "using the system dependent script\n |${main::scriptDirectory}png2eps| \n "; 895 896 897 } else { 898 die "|$pngSourceFile| cannot be found. Problem number: |$main::probNum|"; } 899 } 900 901 } else { 902 wwerror("Error in alias: dangerousMacros.pl","unrecognizable displayMode = $main::displayMode",""); 903 } 904 ##################################################### 905 # FILES with unrecognized file extensions in all display modes 906 ##################################################### 907 908 } else { # $ext is not recognized 909 warn "Error in the macro alias. Alias does not understand how to process 910 files with extension $ext. (Path ot problem file is $main::fileName) "; 911 912 } 913 warn "The macro alias was unable to form a URL for some auxiliary file used in this problem." unless $adr_output; 914 $adr_output; 915 ; 916 917 } 918 919 920 921 922 923 # Experiments 924 925 # It is important that these subroutines using sort are evaluated before 926 # the problem template is evaluated. 927 # Once the problem template has a "my $a;" susequent sort routines will not work. 928 # 929 # PGsort can be used as a slightly slower but safer sort within problems. 930 931 932 933 =head2 PGsort 934 935 Because of the way sort is optimized in Perl, the symbols $a and $b 936 have special significance. 937 938 C<sort {$a<=>$b} @list> 939 C<sort {$a cmp $b} @list> 940 941 sorts the list numerically and lexically respectively. 942 943 If C<my $a;> is used in a problem, before the sort routine is defined in a macro, then 944 things get badly confused. To correct this, the following macros are defined in 945 dangerougMacros.pl which is evaluated before the problem template is read. 946 947 PGsort sub { $_[0] <=> $_[1] }, @list; 948 PGsort sub { $_[0] cmp $_[1] }, @list; 949 950 provide slightly slower, but safer, routines for the PG language. (The subroutines 951 for ordering are B<required>. Note the commas!) 952 953 =cut 954 955 956 957 # sub PGsort { 958 # my $sort_order = shift; 959 # die "Must supply an ordering function with PGsort: PGsort sub {\$a cmp \$b }, \@list\n" unless ref($sort_order) eq 'CODE'; 960 # sort {&$sort_order($a,$b)} @_; 961 # } 962 # Moved to translate.pl 963 # For some reason it still caused 964 # trouble here when there was 965 # more than one ans_eval in ANS() 966 # No-one knows why? 967 968 # This allows the use of i for imaginary numbers 969 # one can write 3 +2i rather than 3+2i() 970 # 971 972 sub i; 973 974 1; # required to load properly
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