1: #
2: # $Id: Spreadsheet.pm,v 1.17 2003/06/23 19:58:18 matthew Exp $
3: #
4: # Copyright Michigan State University Board of Trustees
5: #
6: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
7: #
8: # LON-CAPA is free software; you can redistribute it and/or modify
9: # it under the terms of the GNU General Public License as published by
10: # the Free Software Foundation; either version 2 of the License, or
11: # (at your option) any later version.
12: #
13: # LON-CAPA is distributed in the hope that it will be useful,
14: # but WITHOUT ANY WARRANTY; without even the implied warranty of
15: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: # GNU General Public License for more details.
17: #
18: # You should have received a copy of the GNU General Public License
19: # along with LON-CAPA; if not, write to the Free Software
20: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21: #
22: # /home/httpd/html/adm/gpl.txt
23: #
24: # http://www.lon-capa.org/
25: #
26: # The LearningOnline Network with CAPA
27: # Spreadsheet/Grades Display Handler
28: #
29: # POD required stuff:
30:
31: =head1 NAME
32:
33: Spreadsheet
34:
35: =head1 SYNOPSIS
36:
37: =head1 DESCRIPTION
38:
39: =over 4
40:
41: =cut
42:
43: ###################################################
44: ###################################################
45: ### Spreadsheet ###
46: ###################################################
47: ###################################################
48: package Apache::Spreadsheet;
49:
50: use strict;
51: use Apache::Constants qw(:common :http);
52: use Apache::lonnet;
53: use Safe;
54: use Safe::Hole;
55: use Opcode;
56: use HTML::Entities();
57: use HTML::TokeParser;
58: use Spreadsheet::WriteExcel;
59: use Time::HiRes;
60:
61: ##
62: ## Package Variables
63: ##
64: my %expiredates;
65:
66: my @UC_Columns = split(//,'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
67: my @LC_Columns = split(//,'abcdefghijklmnopqrstuvwxyz');
68:
69: ######################################################
70:
71: =pod
72:
73: =item &new
74:
75: Returns a new spreadsheet object.
76:
77: =cut
78:
79: ######################################################
80: sub new {
81: my $this = shift;
82: my $class = ref($this) || $this;
83: my ($stype) = ($class =~ /Apache::(.*)$/);
84: #
85: my ($name,$domain,$filename,$usymb)=@_;
86: #
87: my $self = {
88: name => $name,
89: domain => $domain,
90: type => $stype,
91: symb => $usymb,
92: errorlog => '',
93: maxrow => '',
94: cid => $ENV{'request.course.id'},
95: cnum => $ENV{'course.'.$ENV{'request.course.id'}.'.num'},
96: cdom => $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
97: chome => $ENV{'course.'.$ENV{'request.course.id'}.'.home'},
98: coursedesc => $ENV{'course.'.$ENV{'request.course.id'}.'.description'},
99: coursefilename => $ENV{'request.course.fn'},
100: #
101: # Flags
102: temporary => 0, # true if this sheet has been modified but not saved
103: new_rows => 0, # true if this sheet has new rows
104: #
105: # blackout is used to determine if any data needs to be hidden from the
106: # student.
107: blackout => 0,
108: #
109: # Data storage
110: formulas => {},
111: constants => {},
112: rows => [],
113: row_source => {},
114: othersheets => [],
115: };
116: #
117: $self->{'uhome'} = &Apache::lonnet::homeserver($name,$domain);
118: #
119: bless($self,$class);
120: #
121: # Load in the spreadsheet definition
122: $self->filename($filename);
123: if (exists($ENV{'form.workcopy'}) &&
124: $self->{'type'} eq $ENV{'form.workcopy'}) {
125: $self->load_tmp();
126: } else {
127: $self->load();
128: }
129: return $self;
130: }
131:
132: ######################################################
133:
134: =pod
135:
136: =item &filename
137:
138: get or set the filename for a spreadsheet.
139:
140: =cut
141:
142: ######################################################
143: sub filename {
144: my $self = shift();
145: if (@_) {
146: my ($newfilename) = @_;
147: if (! defined($newfilename) || $newfilename eq 'Default' ||
148: $newfilename !~ /\w/ || $newfilename eq '') {
149: my $key = 'course.'.$self->{'cid'}.'.spreadsheet_default_'.
150: $self->{'type'};
151: if (exists($ENV{$key}) && $ENV{$key} ne '') {
152: $newfilename = $ENV{$key};
153: } else {
154: $newfilename = 'default_'.$self->{'type'};
155: }
156: }
157: if ($newfilename !~ /\w/ || $newfilename =~ /^\W*$/) {
158: $newfilename = 'default_'.$self->{'type'};
159: }
160: if ($newfilename !~ /^default\.$self->{'type'}$/ ) {
161: if ($newfilename !~ /_$self->{'type'}$/) {
162: $newfilename =~ s/[\s_]*$//;
163: $newfilename .= '_'.$self->{'type'};
164: }
165: }
166: $self->{'filename'} = $newfilename;
167: return;
168: }
169: return $self->{'filename'};
170: }
171:
172: ######################################################
173:
174: =pod
175:
176: =item &make_default()
177:
178: Make the current spreadsheet file the default for the course. Expires all the
179: default spreadsheets.......!
180:
181: =cut
182:
183: ######################################################
184: sub make_default {
185: my $self = shift();
186: my $result = &Apache::lonnet::put('environment',
187: {'spreadsheet_default_'.$self->{'type'} => $self->filename()},
188: $self->{'cdom'},$self->{'cnum'});
189: return $result if ($result ne 'ok');
190: my $symb = $self->{'symb'};
191: $symb = '' if (! defined($symb));
192: &Apache::lonnet::expirespread('','',$self->{'type'},$symb);
193: }
194:
195: ######################################################
196:
197: =pod
198:
199: =item &is_default()
200:
201: Returns 1 if the current spreadsheet is the default as specified in the
202: course environment. Returns 0 otherwise.
203:
204: =cut
205:
206: ######################################################
207: sub is_default {
208: my $self = shift;
209: # Check to find out if we are the default spreadsheet (filenames match)
210: my $default_filename = '';
211: my %tmphash = &Apache::lonnet::get('environment',
212: ['spreadsheet_default_'.
213: $self->{'type'}],
214: $self->{'cdom'},
215: $self->{'cnum'});
216: my ($tmp) = keys(%tmphash);
217: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
218: $default_filename = $tmphash{'spreadsheet_default_'.$self->{'type'}};
219: }
220: if ($default_filename =~ /^\s*$/) {
221: $default_filename = 'default_'.$self->{'type'};
222: }
223: return 1 if ($self->filename() eq $default_filename);
224: return 0;
225: }
226:
227: sub initialize {
228: # This method is here to remind you that it will be overridden by
229: # the descendents of the spreadsheet class.
230: }
231:
232: sub initialize_spreadsheet_package {
233: &load_spreadsheet_expirationdates();
234: &clear_spreadsheet_definition_cache();
235: }
236:
237: sub load_spreadsheet_expirationdates {
238: undef %expiredates;
239: my $cid=$ENV{'request.course.id'};
240: my @tmp = &Apache::lonnet::dump('nohist_expirationdates',
241: $ENV{'course.'.$cid.'.domain'},
242: $ENV{'course.'.$cid.'.num'});
243: if (lc($tmp[0]) !~ /^error/){
244: %expiredates = @tmp;
245: }
246: }
247:
248: sub check_expiration_time {
249: my $self = shift;
250: my ($time)=@_;
251: my ($key1,$key2,$key3,$key4);
252: $key1 = '::'.$self->{'type'}.':';
253: $key2 = $self->{'name'}.':'.$self->{'domain'}.':'.$self->{'type'}.':';
254: $key3 = $key2.$self->{'container'} if (defined($self->{'container'}));
255: $key4 = $key2.$self->{'usymb'} if (defined($self->{'usymb'}));
256: foreach my $key ($key1,$key2,$key3,$key4) {
257: next if (! defined($key));
258: if (exists($expiredates{$key}) &&$expiredates{$key} > $time) {
259: return 0;
260: }
261: }
262: return 1;
263: }
264:
265: ######################################################
266:
267: =pod
268:
269: =item &initialize_safe_space
270:
271: Returns the safe space required by a Spreadsheet object.
272:
273: =head 2 Safe Space Functions
274:
275: =over 4
276:
277: =cut
278:
279: ######################################################
280: sub initialize_safe_space {
281: my $self = shift;
282: my $safeeval = new Safe(shift);
283: my $safehole = new Safe::Hole;
284: $safeeval->permit("entereval");
285: $safeeval->permit(":base_math");
286: $safeeval->permit("sort");
287: $safeeval->deny(":base_io");
288: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
289: $safehole->wrap(\&mask,$safeeval,'&mask');
290: $safeeval->share('$@');
291: my $code=<<'ENDDEFS';
292: # ---------------------------------------------------- Inside of the safe space
293: #
294: # f: formulas
295: # t: intermediate format (variable references expanded)
296: # v: output values
297: # c: preloaded constants (A-column)
298: # rl: row label
299: # os: other spreadsheets (for student spreadsheet only)
300: undef %sheet_values; # Holds the (computed, final) values for the sheet
301: # This is only written to by &calc, the spreadsheet computation routine.
302: # It is read by many functions
303: undef %t; # Holds the values of the spreadsheet temporarily. Set in &sett,
304: # which does the translation of strings like C5 into the value in C5.
305: # Used in &calc - %t holds the values that are actually eval'd.
306: undef %f; # Holds the formulas for each cell. This is the users
307: # (spreadsheet authors) data for each cell.
308: undef %c; # Holds the constants for a sheet. In the assessment
309: # sheets, this is the A column. Used in &MINPARM, &MAXPARM, &expandnamed,
310: # &sett, and &constants. There is no &getconstants.
311: # &constants is called by &loadstudent, &loadcourse, &load assessment,
312: undef @os; # Holds the names of other spreadsheets - this is used to specify
313: # the spreadsheets that are available for the assessment sheet.
314: # Set by &setothersheets. &setothersheets is called by &handler. A
315: # related subroutine is &othersheets.
316: $errorlog = '';
317: #
318: $maxrow = 0;
319: $type = '';
320: #
321: # filename/reference of the sheet
322: $filename = '';
323: #
324: # user data
325: $name = '';
326: $uhome = '';
327: $domain = '';
328: #
329: # course data
330: $csec = '';
331: $chome= '';
332: $cnum = '';
333: $cdom = '';
334: $cid = '';
335: $coursefilename = '';
336: #
337: # symb
338: $usymb = '';
339: #
340: # error messages
341: $errormsg = '';
342: #
343: #-------------------------------------------------------
344:
345: =pod
346:
347: =item NUM(range)
348:
349: returns the number of items in the range.
350:
351: =cut
352:
353: #-------------------------------------------------------
354: sub NUM {
355: my $mask=&mask(@_);
356: my $num= $#{@{grep(/$mask/,keys(%sheet_values))}}+1;
357: return $num;
358: }
359:
360: #-------------------------------------------------------
361:
362: =pod
363:
364: =item BIN(low,high,lower,upper)
365:
366: =cut
367:
368: #-------------------------------------------------------
369: sub BIN {
370: my ($low,$high,$lower,$upper)=@_;
371: my $mask=&mask($lower,$upper);
372: my $num=0;
373: foreach (grep /$mask/,keys(%sheet_values)) {
374: if (($sheet_values{$_}>=$low) && ($sheet_values{$_}<=$high)) {
375: $num++;
376: }
377: }
378: return $num;
379: }
380:
381: #-------------------------------------------------------
382:
383: =pod
384:
385: =item SUM(range)
386:
387: returns the sum of items in the range.
388:
389: =cut
390:
391: #-------------------------------------------------------
392: sub SUM {
393: my $mask=&mask(@_);
394: my $sum=0;
395: foreach (grep /$mask/,keys(%sheet_values)) {
396: $sum+=$sheet_values{$_};
397: }
398: return $sum;
399: }
400:
401: #-------------------------------------------------------
402:
403: =pod
404:
405: =item MEAN(range)
406:
407: compute the average of the items in the range.
408:
409: =cut
410:
411: #-------------------------------------------------------
412: sub MEAN {
413: my $mask=&mask(@_);
414: my $sum=0;
415: my $num=0;
416: foreach (grep /$mask/,keys(%sheet_values)) {
417: $sum+=$sheet_values{$_};
418: $num++;
419: }
420: if ($num) {
421: return $sum/$num;
422: } else {
423: return undef;
424: }
425: }
426:
427: #-------------------------------------------------------
428:
429: =pod
430:
431: =item STDDEV(range)
432:
433: compute the standard deviation of the items in the range.
434:
435: =cut
436:
437: #-------------------------------------------------------
438: sub STDDEV {
439: my $mask=&mask(@_);
440: my $sum=0; my $num=0;
441: foreach (grep /$mask/,keys(%sheet_values)) {
442: $sum+=$sheet_values{$_};
443: $num++;
444: }
445: unless ($num>1) { return undef; }
446: my $mean=$sum/$num;
447: $sum=0;
448: foreach (grep /$mask/,keys(%sheet_values)) {
449: $sum+=($sheet_values{$_}-$mean)**2;
450: }
451: return sqrt($sum/($num-1));
452: }
453:
454: #-------------------------------------------------------
455:
456: =pod
457:
458: =item PROD(range)
459:
460: compute the product of the items in the range.
461:
462: =cut
463:
464: #-------------------------------------------------------
465: sub PROD {
466: my $mask=&mask(@_);
467: my $prod=1;
468: foreach (grep /$mask/,keys(%sheet_values)) {
469: $prod*=$sheet_values{$_};
470: }
471: return $prod;
472: }
473:
474: #-------------------------------------------------------
475:
476: =pod
477:
478: =item MAX(range)
479:
480: compute the maximum of the items in the range.
481:
482: =cut
483:
484: #-------------------------------------------------------
485: sub MAX {
486: my $mask=&mask(@_);
487: my $max='-';
488: foreach (grep /$mask/,keys(%sheet_values)) {
489: unless ($max) { $max=$sheet_values{$_}; }
490: if (($sheet_values{$_}>$max) || ($max eq '-')) {
491: $max=$sheet_values{$_};
492: }
493: }
494: return $max;
495: }
496:
497: #-------------------------------------------------------
498:
499: =pod
500:
501: =item MIN(range)
502:
503: compute the minimum of the items in the range.
504:
505: =cut
506:
507: #-------------------------------------------------------
508: sub MIN {
509: my $mask=&mask(@_);
510: my $min='-';
511: foreach (grep /$mask/,keys(%sheet_values)) {
512: unless ($max) { $max=$sheet_values{$_}; }
513: if (($sheet_values{$_}<$min) || ($min eq '-')) {
514: $min=$sheet_values{$_};
515: }
516: }
517: return $min;
518: }
519:
520: #-------------------------------------------------------
521:
522: =pod
523:
524: =item SUMMAX(num,lower,upper)
525:
526: compute the sum of the largest 'num' items in the range from
527: 'lower' to 'upper'
528:
529: =cut
530:
531: #-------------------------------------------------------
532: sub SUMMAX {
533: my ($num,$lower,$upper)=@_;
534: my $mask=&mask($lower,$upper);
535: my @inside=();
536: foreach (grep /$mask/,keys(%sheet_values)) {
537: push (@inside,$sheet_values{$_});
538: }
539: @inside=sort(@inside);
540: my $sum=0; my $i;
541: for ($i=$#inside;(($i>$#inside-$num) && ($i>=0));$i--) {
542: $sum+=$inside[$i];
543: }
544: return $sum;
545: }
546:
547: #-------------------------------------------------------
548:
549: =pod
550:
551: =item SUMMIN(num,lower,upper)
552:
553: compute the sum of the smallest 'num' items in the range from
554: 'lower' to 'upper'
555:
556: =cut
557:
558: #-------------------------------------------------------
559: sub SUMMIN {
560: my ($num,$lower,$upper)=@_;
561: my $mask=&mask($lower,$upper);
562: my @inside=();
563: foreach (grep /$mask/,keys(%sheet_values)) {
564: $inside[$#inside+1]=$sheet_values{$_};
565: }
566: @inside=sort(@inside);
567: my $sum=0; my $i;
568: for ($i=0;(($i<$num) && ($i<=$#inside));$i++) {
569: $sum+=$inside[$i];
570: }
571: return $sum;
572: }
573:
574: #-------------------------------------------------------
575:
576: =pod
577:
578: =item MINPARM(parametername)
579:
580: Returns the minimum value of the parameters matching the parametername.
581: parametername should be a string such as 'duedate'.
582:
583: =cut
584:
585: #-------------------------------------------------------
586: sub MINPARM {
587: my ($expression) = @_;
588: my $min = undef;
589: study($expression);
590: foreach $parameter (keys(%c)) {
591: next if ($parameter !~ /$expression/);
592: if ((! defined($min)) || ($min > $c{$parameter})) {
593: $min = $c{$parameter}
594: }
595: }
596: return $min;
597: }
598:
599: #-------------------------------------------------------
600:
601: =pod
602:
603: =item MAXPARM(parametername)
604:
605: Returns the maximum value of the parameters matching the input parameter name.
606: parametername should be a string such as 'duedate'.
607:
608: =cut
609:
610: #-------------------------------------------------------
611: sub MAXPARM {
612: my ($expression) = @_;
613: my $max = undef;
614: study($expression);
615: foreach $parameter (keys(%c)) {
616: next if ($parameter !~ /$expression/);
617: if ((! defined($min)) || ($max < $c{$parameter})) {
618: $max = $c{$parameter}
619: }
620: }
621: return $max;
622: }
623:
624:
625: sub calc {
626: %sheet_values = %t;
627: my $notfinished = 1;
628: my $lastcalc = '';
629: my $depth = 0;
630: while ($notfinished) {
631: $notfinished=0;
632: while (my ($cell,$value) = each(%t)) {
633: my $old=$sheet_values{$cell};
634: $sheet_values{$cell}=eval $value;
635: # $errorlog .= $cell.' = '.$old.'->'.$sheet_values{$cell}."\n";
636: if ($@) {
637: undef %sheet_values;
638: return $cell.': '.$@;
639: }
640: if ($sheet_values{$cell} ne $old) {
641: $notfinished=1;
642: $lastcalc=$cell;
643: }
644: }
645: # $errorlog.="------------------------------------------------";
646:
647: $depth++;
648: if ($depth>100) {
649: undef %sheet_values;
650: return $lastcalc.': Maximum calculation depth exceeded';
651: }
652: }
653: return '';
654: }
655:
656: # ------------------------------------------- End of "Inside of the safe space"
657: ENDDEFS
658: $safeeval->reval($code);
659: $self->{'safe'} = $safeeval;
660: $self->{'root'} = $self->{'safe'}->root();
661: #
662: # Place some of the %$self items into the safe space except the safe space
663: # itself
664: my $initstring = '';
665: foreach (qw/name domain type usymb cid csec coursefilename
666: cnum cdom chome uhome/) {
667: $initstring.= qq{\$$_="$self->{$_}";};
668: }
669: $self->{'safe'}->reval($initstring);
670: return $self;
671: }
672: ######################################################
673:
674: =pod
675:
676: =back
677:
678: =cut
679:
680: ######################################################
681:
682:
683: ######################################################
684:
685:
686: ######################################################
687: {
688:
689: my %memoizer;
690:
691: sub mask {
692: my ($lower,$upper)=@_;
693: my $key = $lower.'_'.$upper;
694: if (exists($memoizer{$key})) {
695: return $memoizer{$key};
696: }
697: $upper = $lower if (! defined($upper));
698: #
699: my ($la,$ld) = ($lower=~/([A-Za-z]|\*)(\d+|\*)/);
700: my ($ua,$ud) = ($upper=~/([A-Za-z]|\*)(\d+|\*)/);
701: #
702: my $alpha='';
703: my $num='';
704: #
705: if (($la eq '*') || ($ua eq '*')) {
706: $alpha='[A-Za-z]';
707: } else {
708: if (($la=~/[A-Z]/) && ($ua=~/[A-Z]/) ||
709: ($la=~/[a-z]/) && ($ua=~/[a-z]/)) {
710: $alpha='['.$la.'-'.$ua.']';
711: } else {
712: $alpha='['.$la.'-Za-'.$ua.']';
713: }
714: }
715: if (($ld eq '*') || ($ud eq '*')) {
716: $num='\d+';
717: } else {
718: if (length($ld)!=length($ud)) {
719: $num.='(';
720: foreach ($ld=~m/\d/g) {
721: $num.='['.$_.'-9]';
722: }
723: if (length($ud)-length($ld)>1) {
724: $num.='|\d{'.(length($ld)+1).','.(length($ud)-1).'}';
725: }
726: $num.='|';
727: foreach ($ud=~m/\d/g) {
728: $num.='[0-'.$_.']';
729: }
730: $num.=')';
731: } else {
732: my @lda=($ld=~m/\d/g);
733: my @uda=($ud=~m/\d/g);
734: my $i;
735: my $j=0;
736: my $notdone=1;
737: for ($i=0;($i<=$#lda)&&($notdone);$i++) {
738: if ($lda[$i]==$uda[$i]) {
739: $num.=$lda[$i];
740: $j=$i;
741: } else {
742: $notdone=0;
743: }
744: }
745: if ($j<$#lda-1) {
746: $num.='('.$lda[$j+1];
747: for ($i=$j+2;$i<=$#lda;$i++) {
748: $num.='['.$lda[$i].'-9]';
749: }
750: if ($uda[$j+1]-$lda[$j+1]>1) {
751: $num.='|['.($lda[$j+1]+1).'-'.($uda[$j+1]-1).']\d{'.
752: ($#lda-$j-1).'}';
753: }
754: $num.='|'.$uda[$j+1];
755: for ($i=$j+2;$i<=$#uda;$i++) {
756: $num.='[0-'.$uda[$i].']';
757: }
758: $num.=')';
759: } else {
760: if ($lda[-1]!=$uda[-1]) {
761: $num.='['.$lda[-1].'-'.$uda[-1].']';
762: }
763: }
764: }
765: }
766: my $expression ='^'.$alpha.$num."\$";
767: $memoizer{$key} = $expression;
768: return $expression;
769: }
770:
771: }
772:
773: ##
774: ## sub add_hash_to_safe {} # spreadsheet, would like to destroy
775: ##
776:
777: #
778: # expandnamed used to reside in the safe space
779: #
780: sub expandnamed {
781: my $self = shift;
782: my $expression=shift;
783: if ($expression=~/^\&/) {
784: my ($func,$var,$formula)=($expression=~/^\&(\w+)\(([^\;]+)\;(.*)\)/);
785: my @vars=split(/\W+/,$formula);
786: my %values=();
787: foreach my $varname ( @vars ) {
788: if ($varname=~/\D/) {
789: $formula=~s/$varname/'$c{\''.$varname.'\'}'/ge;
790: $varname=~s/$var/\([\\w:\\- ]\+\)/g;
791: foreach (keys(%{$self->{'constants'}})) {
792: if ($_=~/$varname/) {
793: $values{$1}=1;
794: }
795: }
796: }
797: }
798: if ($func eq 'EXPANDSUM') {
799: my $result='';
800: foreach (keys(%values)) {
801: my $thissum=$formula;
802: $thissum=~s/$var/$_/g;
803: $result.=$thissum.'+';
804: }
805: $result=~s/\+$//;
806: return $result;
807: } else {
808: return 0;
809: }
810: } else {
811: # it is not a function, so it is a parameter name
812: # We should do the following:
813: # 1. Take the list of parameter names
814: # 2. look through the list for ones that match the parameter we want
815: # 3. If there are no collisions, return the one that matches
816: # 4. If there is a collision, return 'bad parameter name error'
817: my $returnvalue = '';
818: my @matches = ();
819: my @values = ();
820: $#matches = -1;
821: study $expression;
822: while (my($parameter,$value) = each(%{$self->{'constants'}})) {
823: next if ($parameter !~ /$expression/);
824: push(@matches,$parameter);
825: push(@values,$value);
826: }
827: if (scalar(@matches) == 0) {
828: $returnvalue = '""';#'"unmatched parameter: '.$parameter.'"';
829: } elsif (scalar(@matches) == 1) {
830: # why do we not do this lookup here, instead of delaying it?
831: $returnvalue = $values[0];
832: } elsif (scalar(@matches) > 0) {
833: # more than one match. Look for a concise one
834: $returnvalue = "'non-unique parameter name : $expression'";
835: for (my $i=0; $i<=$#matches;$i++) {
836: if ($matches[$i] =~ /^$expression$/) {
837: # why do we not do this lookup here?
838: $returnvalue = $values[$i];
839: }
840: }
841: } else {
842: # There was a negative number of matches, which indicates
843: # something is wrong with reality. Better warn the user.
844: $returnvalue = '"bizzare parameter: '.$expression.'"';
845: }
846: return $returnvalue;
847: }
848: }
849:
850: sub sett {
851: my $self = shift;
852: my %t=();
853: #
854: # Deal with the template row
855: foreach my $col ($self->template_cells()) {
856: next if ($col=~/^[A-Z]/);
857: foreach my $row ($self->rows()) {
858: # Get the name of this cell
859: my $cell=$col.$row;
860: # Grab the template declaration
861: $t{$cell}=$self->formula('template_'.$col);
862: # Replace '#' with the row number
863: $t{$cell}=~s/\#/$row/g;
864: # Replace '....' with ','
865: $t{$cell}=~s/\.\.+/\,/g;
866: # Replace 'A0' with the value from 'A0'
867: $t{$cell}=~s/(^|[^\"\'])([A-Za-z]\d+)/$1\$sheet_values\{\'$2\'\}/g;
868: # Replace parameters
869: $t{$cell}=~s/(^|[^\"\'])\[([^\]]+)\]/$1.$self->expandnamed($2)/ge;
870: }
871: }
872: #
873: # Deal with the normal cells
874: while (my($cell,$formula) = each(%{$self->{'formulas'}})) {
875: next if ($_=~/^template\_/);
876: my ($col,$row) = ($cell =~ /^([A-z])(\d+)$/);
877: if ($row eq '0') {
878: $t{$cell}=$formula;
879: $t{$cell}=~s/\.\.+/\,/g;
880: $t{$cell}=~s/(^|[^\"\'])([A-Za-z]\d+)/$1\$sheet_values\{\'$2\'\}/g;
881: $t{$cell}=~s/(^|[^\"\'])\[([^\]]+)\]/$1.$self->expandnamed($2)/ge;
882: } elsif ( $col =~ /^[A-Z]$/ ) {
883: if ($formula !~ /^\!/ && exists($self->{'constants'}->{$cell})) {
884: my $data = $self->{'constants'}->{$cell};
885: $t{$cell} = $data;
886: }
887: } else { # $row > 1 and $col =~ /[a-z]
888: $t{$cell}=$formula;
889: $t{$cell}=~s/\.\.+/\,/g;
890: $t{$cell}=~s/(^|[^\"\'])([A-Za-z]\d+)/$1\$sheet_values\{\'$2\'\}/g;
891: $t{$cell}=~s/(^|[^\"\'])\[([^\]]+)\]/$1.$self->expandnamed($2)/ge;
892: }
893: }
894: %{$self->{'safe'}->varglob('t')}=%t;
895: }
896:
897: ##
898: ## sync_safe_space: Called by calcsheet to make sure all the data we
899: # need to calculate is placed into the safe space
900: ##
901: sub sync_safe_space {
902: my $self = shift;
903: # Inside the safe space 'formulas' has a diabolical alter-ego named 'f'.
904: %{$self->{'safe'}->varglob('f')}=%{$self->{'formulas'}};
905: # 'constants' leads a peaceful hidden life of 'c'.
906: %{$self->{'safe'}->varglob('c')}=%{$self->{'constants'}};
907: # 'othersheets' hides as 'os', a disguise few can penetrate.
908: @{$self->{'safe'}->varglob('os')}=@{$self->{'othersheets'}};
909: }
910:
911: ##
912: ## Retrieve the error log from the safe space (used for debugging)
913: ##
914: sub get_errorlog {
915: my $self = shift;
916: $self->{'errorlog'} = $ { $self->{'safe'}->varglob('errorlog') };
917: return $self->{'errorlog'};
918: }
919:
920: ##
921: ## Clear the error log inside the safe space
922: ##
923: sub clear_errorlog {
924: my $self = shift;
925: $ {$self->{'safe'}->varglob('errorlog')} = '';
926: $self->{'errorlog'} = '';
927: }
928:
929: ##
930: ## constants: either set or get the constants
931: ##
932: sub constants {
933: my $self=shift;
934: my ($constants) = @_;
935: if (defined($constants)) {
936: if (! ref($constants)) {
937: my %tmp = @_;
938: $constants = \%tmp;
939: }
940: $self->{'constants'} = $constants;
941: return;
942: } else {
943: return %{$self->{'constants'}};
944: }
945: }
946:
947: ##
948: ## formulas: either set or get the formulas
949: ##
950: sub formulas {
951: my $self=shift;
952: my ($formulas) = @_;
953: if (defined($formulas)) {
954: if (! ref($formulas)) {
955: my %tmp = @_;
956: $formulas = \%tmp;
957: }
958: $self->{'formulas'} = $formulas;
959: $self->{'rows'} = [];
960: $self->{'template_cells'} = [];
961: return;
962: } else {
963: return %{$self->{'formulas'}};
964: }
965: }
966:
967: sub set_formula {
968: my $self = shift;
969: my ($cell,$formula) = @_;
970: $self->{'formulas'}->{$cell}=$formula;
971: return;
972: }
973:
974: ##
975: ## formulas_keys: Return the keys to the formulas hash.
976: ##
977: sub formulas_keys {
978: my $self = shift;
979: my @keys = keys(%{$self->{'formulas'}});
980: return keys(%{$self->{'formulas'}});
981: }
982:
983: ##
984: ## formula: Return the formula for a given cell in the spreadsheet
985: ## returns '' if the cell does not have a formula or does not exist
986: ##
987: sub formula {
988: my $self = shift;
989: my $cell = shift;
990: if (defined($cell) && exists($self->{'formulas'}->{$cell})) {
991: return $self->{'formulas'}->{$cell};
992: }
993: return '';
994: }
995:
996: ##
997: ## logthis: write the input to lonnet.log
998: ##
999: sub logthis {
1000: my $self = shift;
1001: my $message = shift;
1002: &Apache::lonnet::logthis($self->{'type'}.':'.
1003: $self->{'name'}.':'.$self->{'domain'}.':'.
1004: $message);
1005: return;
1006: }
1007:
1008: ##
1009: ## dump_formulas_to_log: makes lonnet.log huge...
1010: ##
1011: sub dump_formulas_to_log {
1012: my $self =shift;
1013: $self->logthis("Spreadsheet formulas");
1014: $self->logthis("--------------------------------------------------------");
1015: while (my ($cell, $formula) = each(%{$self->{'formulas'}})) {
1016: $self->logthis(' '.$cell.' = '.$formula);
1017: }
1018: $self->logthis("--------------------------------------------------------");}
1019:
1020: ##
1021: ## value: returns the computed value of a particular cell
1022: ##
1023: sub value {
1024: my $self = shift;
1025: my $cell = shift;
1026: if (defined($cell) && exists($self->{'values'}->{$cell})) {
1027: return $self->{'values'}->{$cell};
1028: }
1029: return '';
1030: }
1031:
1032: ##
1033: ## dump_values_to_log: makes lonnet.log huge...
1034: ##
1035: sub dump_values_to_log {
1036: my $self =shift;
1037: $self->logthis("Spreadsheet Values");
1038: $self->logthis("------------------------------------------------------");
1039: while (my ($cell, $value) = each(%{$self->{'values'}})) {
1040: $self->logthis(' '.$cell.' = '.$value);
1041: }
1042: $self->logthis("------------------------------------------------------");
1043: }
1044:
1045: ##
1046: ## Yet another debugging function
1047: ##
1048: sub dump_hash_to_log {
1049: my $self= shift();
1050: my %tmp = @_;
1051: if (@_<2) {
1052: %tmp = %{$_[0]};
1053: }
1054: $self->logthis('---------------------------- (begin hash dump)');
1055: while (my ($key,$val) = each (%tmp)) {
1056: $self->logthis(' '.$key.' = '.$val.':');
1057: }
1058: $self->logthis('---------------------------- (finished hash dump)');
1059: }
1060:
1061: ##
1062: ## rebuild_stats: rebuilds the rows and template_cells arrays
1063: ##
1064: sub rebuild_stats {
1065: my $self = shift;
1066: $self->{'rows'}=[];
1067: $self->{'template_cells'}=[];
1068: while (my ($cell,$formula) = each(%{$self->{'formulas'}})) {
1069: push(@{$self->{'rows'}},$1) if ($cell =~ /^A(\d+)/ && $1 != 0);
1070: push(@{$self->{'template_cells'}},$1) if ($cell =~ /^template_(\w+)/);
1071: }
1072: return;
1073: }
1074:
1075: ##
1076: ## template_cells returns a list of the cells defined in the template row
1077: ##
1078: sub template_cells {
1079: my $self = shift;
1080: $self->rebuild_stats() if (! defined($self->{'template_cells'}) ||
1081: ! @{$self->{'template_cells'}});
1082: return @{$self->{'template_cells'}};
1083: }
1084:
1085: ##
1086: ## Sigh....
1087: ##
1088: sub setothersheets {
1089: my $self = shift;
1090: my @othersheets = @_;
1091: $self->{'othersheets'} = \@othersheets;
1092: }
1093:
1094: ##
1095: ## rows returns a list of the names of cells defined in the A column
1096: ##
1097: sub rows {
1098: my $self = shift;
1099: $self->rebuild_stats() if (!@{$self->{'rows'}});
1100: return @{$self->{'rows'}};
1101: }
1102:
1103: #
1104: # calcsheet: makes all the calls to compute the spreadsheet.
1105: #
1106: sub calcsheet {
1107: my $self = shift;
1108: $self->sync_safe_space();
1109: $self->clear_errorlog();
1110: $self->sett();
1111: my $result = $self->{'safe'}->reval('&calc();');
1112: # $self->logthis($self->get_errorlog());
1113: %{$self->{'values'}} = %{$self->{'safe'}->varglob('sheet_values')};
1114: # $self->logthis($self->get_errorlog());
1115: return $result;
1116: }
1117:
1118: ###########################################################
1119: ##
1120: ## Output Helpers
1121: ##
1122: ###########################################################
1123: sub display {
1124: my $self = shift;
1125: my ($r) = @_;
1126: $self->compute($r);
1127: my $outputmode = 'html';
1128: if ($ENV{'form.output_format'} =~ /^(html|excel|csv)$/) {
1129: $outputmode = $ENV{'form.output_format'};
1130: }
1131: if ($outputmode eq 'html') {
1132: $self->outsheet_html($r);
1133: } elsif ($outputmode eq 'excel') {
1134: $self->outsheet_excel($r);
1135: } elsif ($outputmode eq 'csv') {
1136: $self->outsheet_csv($r);
1137: }
1138: return;
1139: }
1140:
1141: ############################################
1142: ## HTML output routines ##
1143: ############################################
1144: sub html_export_row {
1145: my $self = shift();
1146: my ($color) = @_;
1147: $color = '#CCCCFF' if (! defined($color));
1148: my $allowed = &Apache::lonnet::allowed('mgr',$ENV{'request.course.id'});
1149: my $row_html;
1150: my @rowdata = $self->get_row(0);
1151: foreach my $cell (@rowdata) {
1152: if ($cell->{'name'} =~ /^[A-Z]/) {
1153: $row_html .= '<td bgcolor="'.$color.'">'.
1154: &html_editable_cell($cell,$color,$allowed).'</td>';
1155: } else {
1156: $row_html .= '<td bgcolor="#DDCCFF">'.
1157: &html_editable_cell($cell,'#DDCCFF',$allowed).'</td>';
1158: }
1159: }
1160: return $row_html;
1161: }
1162:
1163: sub html_template_row {
1164: my $self = shift();
1165: my $allowed = &Apache::lonnet::allowed('mgr',$ENV{'request.course.id'});
1166: my ($num_uneditable,$importcolor) = @_;
1167: my $row_html;
1168: my @rowdata = $self->get_template_row();
1169: my $count = 0;
1170: for (my $i = 0; $i<=$#rowdata; $i++) {
1171: my $cell = $rowdata[$i];
1172: if ($i < $num_uneditable) {
1173: $row_html .= '<td bgcolor="'.$importcolor.'">'.
1174: &html_uneditable_cell($cell,'#FFDDDD',$allowed).'</td>';
1175: } else {
1176: $row_html .= '<td bgcolor="#EOFFDD">'.
1177: &html_editable_cell($cell,'#EOFFDD',$allowed).'</td>';
1178: }
1179: }
1180: return $row_html;
1181: }
1182:
1183: sub html_editable_cell {
1184: my ($cell,$bgcolor,$allowed) = @_;
1185: my $result;
1186: my ($name,$formula,$value);
1187: if (defined($cell)) {
1188: $name = $cell->{'name'};
1189: $formula = $cell->{'formula'};
1190: $value = $cell->{'value'};
1191: }
1192: $name = '' if (! defined($name));
1193: $formula = '' if (! defined($formula));
1194: if (! defined($value)) {
1195: $value = '<font color="'.$bgcolor.'">#</font>';
1196: if ($formula ne '') {
1197: $value = '<i>undefined value</i>';
1198: }
1199: } elsif ($value =~ /^\s*$/ ) {
1200: $value = '<font color="'.$bgcolor.'">#</font>';
1201: } else {
1202: $value = &HTML::Entities::encode($value) if ($value !~/ /);
1203: }
1204: return $value if (! $allowed);
1205: # Make the formula safe for outputting
1206: $formula =~ s/\'/\"/g;
1207: # The formula will be parsed by the browser twice before being
1208: # displayed to the user for editing.
1209: $formula = &HTML::Entities::encode(&HTML::Entities::encode($formula));
1210: # Escape newlines so they make it into the edit window
1211: $formula =~ s/\n/\\n/gs;
1212: # Glue everything together
1213: $result .= "<a href=\"javascript:celledit(\'".
1214: $name."','".$formula."');\">".$value."</a>";
1215: return $result;
1216: }
1217:
1218: sub html_uneditable_cell {
1219: my ($cell,$bgcolor) = @_;
1220: my $value = (defined($cell) ? $cell->{'value'} : '');
1221: $value = &HTML::Entities::encode($value) if ($value !~/ /);
1222: return ' '.$value.' ';
1223: }
1224:
1225: sub html_row {
1226: my $self = shift();
1227: my ($num_uneditable,$row,$exportcolor,$importcolor) = @_;
1228: my $allowed = &Apache::lonnet::allowed('mgr',$ENV{'request.course.id'});
1229: my @rowdata = $self->get_row($row);
1230: my $num_cols_output = 0;
1231: my $row_html;
1232: my $color = $importcolor;
1233: if ($row == 0) {
1234: $color = $exportcolor;
1235: }
1236: $color = '#FFDDDD' if (! defined($color));
1237: foreach my $cell (@rowdata) {
1238: if ($num_cols_output++ < $num_uneditable) {
1239: $row_html .= '<td bgcolor="'.$color.'">';
1240: $row_html .= &html_uneditable_cell($cell,'#FFDDDD');
1241: } else {
1242: $row_html .= '<td bgcolor="#EOFFDD">';
1243: $row_html .= &html_editable_cell($cell,'#E0FFDD',$allowed);
1244: }
1245: $row_html .= '</td>';
1246: }
1247: return $row_html;
1248: }
1249:
1250: sub html_header {
1251: my $self = shift;
1252: return '' if (! $ENV{'request.role.adv'});
1253: return "<table>\n".
1254: '<tr><th align="center">Output Format</th><tr>'."\n".
1255: '<tr><td>'.&output_selector()."</td></tr>\n".
1256: "</table>\n";
1257: }
1258:
1259: sub output_selector {
1260: my $output_selector = '<select name="output_format" size="3">'."\n";
1261: my $default = 'html';
1262: if (exists($ENV{'form.output_format'})) {
1263: $default = $ENV{'form.output_format'}
1264: } else {
1265: $ENV{'form.output_format'} = $default;
1266: }
1267: foreach (['html','HTML'],
1268: ['excel','Excel'],
1269: ['csv','Comma Seperated Values']) {
1270: my ($name,$description) = @{$_};
1271: $output_selector.=qq{<option value="$name"};
1272: if ($name eq $default) {
1273: $output_selector .= ' selected';
1274: }
1275: $output_selector .= ">$description</option>\n";
1276: }
1277: $output_selector .= "</select>\n";
1278: return $output_selector;
1279: }
1280:
1281: ################################################
1282: ## Excel output routines ##
1283: ################################################
1284: sub excel_output_row {
1285: my $self = shift;
1286: my ($worksheet,$rownum,$rows_output,@prepend) = @_;
1287: my $cols_output = 0;
1288: #
1289: my @rowdata = $self->get_row($rownum);
1290: foreach my $cell (@prepend,@rowdata) {
1291: my $value = $cell;
1292: $value = $cell->{'value'} if (ref($value));
1293: $value =~ s/\ / /gi;
1294: $worksheet->write($rows_output,$cols_output++,$value);
1295: }
1296: return;
1297: }
1298:
1299: sub create_excel_spreadsheet {
1300: my $self = shift;
1301: my ($r) = @_;
1302: my $filename = '/prtspool/'.
1303: $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
1304: time.'_'.rand(1000000000).'.xls';
1305: my $workbook = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
1306: if (! defined($workbook)) {
1307: $r->log_error("Error creating excel spreadsheet $filename: $!");
1308: $r->print("Problems creating new Excel file. ".
1309: "This error has been logged. ".
1310: "Please alert your LON-CAPA administrator");
1311: return undef;
1312: }
1313: #
1314: # The excel spreadsheet stores temporary data in files, then put them
1315: # together. If needed we should be able to disable this (memory only).
1316: # The temporary directory must be specified before calling 'addworksheet'.
1317: # File::Temp is used to determine the temporary directory.
1318: $workbook->set_tempdir('/home/httpd/perl/tmp');
1319: #
1320: # Determine the name to give the worksheet
1321: return ($workbook,$filename);
1322: }
1323:
1324: sub outsheet_excel {
1325: my $self = shift;
1326: my ($r) = @_;
1327: $r->print("<h2>Preparing Excel Spreadsheet</h2>");
1328: #
1329: # Create excel worksheet
1330: my ($workbook,$filename) = $self->create_excel_spreadsheet($r);
1331: return if (! defined($workbook));
1332: #
1333: # Create main worksheet
1334: my $worksheet = $workbook->addworksheet('main');
1335: my $rows_output = 0;
1336: my $cols_output = 0;
1337: #
1338: # Write excel header
1339: foreach my $value ($self->get_title()) {
1340: $cols_output = 0;
1341: $worksheet->write($rows_output++,$cols_output,$value);
1342: }
1343: $rows_output++; # skip a line
1344: #
1345: # Write summary/export row
1346: $cols_output = 0;
1347: $self->excel_output_row($worksheet,0,$rows_output++,'Summary');
1348: $rows_output++; # skip a line
1349: #
1350: $self->excel_rows($worksheet,$cols_output,$rows_output);
1351: #
1352: #
1353: # Close the excel file
1354: $workbook->close();
1355: #
1356: # Write a link to allow them to download it
1357: $r->print('<br />'.
1358: '<a href="'.$filename.'">Your Excel spreadsheet.</a>'."\n");
1359: return;
1360: }
1361:
1362: #################################
1363: ## CSV output routines ##
1364: #################################
1365: sub outsheet_csv {
1366: my $self = shift;
1367: my ($r) = @_;
1368: my $csvdata = '';
1369: my @Values;
1370: #
1371: # Open the csv file
1372: my $filename = '/prtspool/'.
1373: $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
1374: time.'_'.rand(1000000000).'.csv';
1375: my $file;
1376: unless ($file = Apache::File->new('>'.'/home/httpd'.$filename)) {
1377: $r->log_error("Couldn't open $filename for output $!");
1378: $r->print("Problems occured in writing the csv file. ".
1379: "This error has been logged. ".
1380: "Please alert your LON-CAPA administrator.");
1381: $r->print("<pre>\n".$csvdata."</pre>\n");
1382: return 0;
1383: }
1384: #
1385: # Output the title information
1386: foreach my $value ($self->get_title()) {
1387: print $file "'".&Apache::loncommon::csv_translate($value)."'\n";
1388: }
1389: #
1390: # Output the body of the spreadsheet
1391: $self->csv_rows($file);
1392: #
1393: # Close the csv file
1394: close($file);
1395: $r->print('<br /><br />'.
1396: '<a href="'.$filename.'">Your CSV spreadsheet.</a>'."\n");
1397: #
1398: return 1;
1399: }
1400:
1401: sub csv_output_row {
1402: my $self = shift;
1403: my ($filehandle,$rownum,@prepend) = @_;
1404: #
1405: my @rowdata = ();
1406: if (defined($rownum)) {
1407: @rowdata = $self->get_row($rownum);
1408: }
1409: my @output = ();
1410: foreach my $cell (@prepend,@rowdata) {
1411: my $value = $cell;
1412: $value = $cell->{'value'} if (ref($value));
1413: $value =~ s/\ / /gi;
1414: $value = "'".$value."'";
1415: push (@output,$value);
1416: }
1417: print $filehandle join(',',@output )."\n";
1418: return;
1419: }
1420:
1421: ############################################
1422: ## XML output routines ##
1423: ############################################
1424: sub outsheet_xml {
1425: my $self = shift;
1426: my ($r) = @_;
1427: ## Someday XML
1428: ## Will be rendered for the user
1429: ## But not on this day
1430: my $Str = '<spreadsheet type="'.$self->{'type'}.'">'."\n";
1431: while (my ($cell,$formula) = each(%{$self->{'formulas'}})) {
1432: if ($cell =~ /^template_(\d+)/) {
1433: my $col = $1;
1434: $Str .= '<template col="'.$col.'">'.$formula.'</template>'."\n";
1435: } else {
1436: my ($row,$col) = ($cell =~ /^([A-z])(\d+)/);
1437: next if (! defined($row) || ! defined($col));
1438: $Str .= '<field row="'.$row.'" col="'.$col.'" >'.$formula.'</cell>'
1439: ."\n";
1440: }
1441: }
1442: $Str.="</spreadsheet>";
1443: return $Str;
1444: }
1445:
1446: ############################################
1447: ### Filesystem routines ###
1448: ############################################
1449: sub parse_sheet {
1450: # $sheetxml is a scalar reference or a scalar
1451: my ($sheetxml) = @_;
1452: if (! ref($sheetxml)) {
1453: my $tmp = $sheetxml;
1454: $sheetxml = \$tmp;
1455: }
1456: my %formulas;
1457: my %sources;
1458: my $parser=HTML::TokeParser->new($sheetxml);
1459: my $token;
1460: while ($token=$parser->get_token) {
1461: if ($token->[0] eq 'S') {
1462: if ($token->[1] eq 'field') {
1463: my $cell = $token->[2]->{'col'}.$token->[2]->{'row'};
1464: my $source = $token->[2]->{'source'};
1465: my $formula = $parser->get_text('/field');
1466: $formulas{$cell} = $formula;
1467: $sources{$cell} = $source if (defined($source));
1468: $parser->get_text('/field');
1469: }
1470: if ($token->[1] eq 'template') {
1471: $formulas{'template_'.$token->[2]->{'col'}}=
1472: $parser->get_text('/template');
1473: }
1474: }
1475: }
1476: return (\%formulas,\%sources);
1477: }
1478:
1479: {
1480:
1481: my %spreadsheets;
1482:
1483: sub clear_spreadsheet_definition_cache {
1484: undef(%spreadsheets);
1485: }
1486:
1487: sub load_system_default_sheet {
1488: my $self = shift;
1489: my $includedir = $Apache::lonnet::perlvar{'lonIncludes'};
1490: # load in the default defined spreadsheet
1491: my $sheetxml='';
1492: my $fh;
1493: if ($fh=Apache::File->new($includedir.'/default_'.$self->{'type'})) {
1494: $sheetxml=join('',<$fh>);
1495: $fh->close();
1496: } else {
1497: # $sheetxml='<field row="0" col="A">"Error"</field>';
1498: $sheetxml='<field row="0" col="A"></field>';
1499: }
1500: $self->filename('default_');
1501: my ($formulas,undef) = &parse_sheet(\$sheetxml);
1502: return $formulas;
1503: }
1504:
1505: sub load {
1506: my $self = shift;
1507: #
1508: my $stype = $self->{'type'};
1509: my $cnum = $self->{'cnum'};
1510: my $cdom = $self->{'cdom'};
1511: my $chome = $self->{'chome'};
1512: #
1513: my $filename = $self->filename();
1514: my $cachekey = join('_',($cnum,$cdom,$stype,$filename));
1515: #
1516: # see if sheet is cached
1517: my ($formulas);
1518: if (exists($spreadsheets{$cachekey})) {
1519: $formulas = $spreadsheets{$cachekey}->{'formulas'};
1520: } else {
1521: # Not cached, need to read
1522: if (! defined($filename)) {
1523: $formulas = $self->load_system_default_sheet();
1524: } elsif($self->filename() =~ /^\/res\/.*\.spreadsheet$/) {
1525: # Load a spreadsheet definition file
1526: my $sheetxml=&Apache::lonnet::getfile
1527: (&Apache::lonnet::filelocation('',$filename));
1528: if ($sheetxml == -1) {
1529: $sheetxml='<field row="0" col="A">"Error loading spreadsheet '
1530: .$self->filename().'"</field>';
1531: }
1532: ($formulas,undef) = &parse_sheet(\$sheetxml);
1533: # Get just the filename and set the sheets filename
1534: my ($newfilename) = ($filename =~ /\/([^\/]*)\.spreadsheet$/);
1535: if ($self->is_default()) {
1536: $self->filename($newfilename);
1537: $self->make_default();
1538: } else {
1539: $self->filename($newfilename);
1540: }
1541: } else {
1542: # Load the spreadsheet definition file from the save file
1543: my %tmphash = &Apache::lonnet::dump($filename,$cdom,$cnum);
1544: my ($tmp) = keys(%tmphash);
1545: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
1546: while (my ($cell,$formula) = each(%tmphash)) {
1547: $formulas->{$cell}=$formula;
1548: }
1549: } else {
1550: $formulas = $self->load_system_default_sheet();
1551: }
1552: }
1553: $filename=$self->filename(); # filename may have changed
1554: $cachekey = join('_',($cnum,$cdom,$stype,$filename));
1555: %{$spreadsheets{$cachekey}->{'formulas'}} = %{$formulas};
1556: }
1557: $self->formulas($formulas);
1558: $self->set_row_sources();
1559: $self->set_row_numbers();
1560: }
1561:
1562: sub set_row_sources {
1563: my $self = shift;
1564: while (my ($cell,$value) = each(%{$self->{'formulas'}})) {
1565: next if ($cell !~ /^A(\d+)/ && $1 > 0);
1566: my $row = $1;
1567: $self->{'row_source'}->{$row} = $value;
1568: }
1569: return;
1570: }
1571:
1572: sub set_row_numbers {
1573: my $self = shift;
1574: while (my ($cell,$value) = each(%{$self->{'formulas'}})) {
1575: next if ($cell !~ /^A(\d+)$/);
1576: next if (! defined($value));
1577: $self->{'row_numbers'}->{$value} = $1;
1578: $self->{'maxrow'} = $1 if ($1 > $self->{'maxrow'});
1579: }
1580: }
1581:
1582: ##
1583: ## exportrow is *not* used to get the export row from a computed sub-sheet.
1584: ##
1585: sub exportrow {
1586: my $self = shift;
1587: my @exportarray;
1588: foreach my $column (@UC_Columns) {
1589: push(@exportarray,$self->value($column.'0'));
1590: }
1591: return @exportarray;
1592: }
1593:
1594: sub save {
1595: my $self = shift;
1596: my ($makedef)=@_;
1597: my $cid=$self->{'cid'};
1598: # If we are saving it, it must not be temporary
1599: $self->temporary(0);
1600: if (&Apache::lonnet::allowed('opa',$cid)) {
1601: my %f=$self->formulas();
1602: my $stype = $self->{'type'};
1603: my $cnum = $self->{'cnum'};
1604: my $cdom = $self->{'cdom'};
1605: my $chome = $self->{'chome'};
1606: my $filename = $self->{'filename'};
1607: my $cachekey = join('_',($cnum,$cdom,$stype,$filename));
1608: # Cache new sheet
1609: %{$spreadsheets{$cachekey}->{'formulas'}}=%f;
1610: # Write sheet
1611: foreach (keys(%f)) {
1612: delete($f{$_}) if ($f{$_} eq 'import');
1613: }
1614: my $reply = &Apache::lonnet::put($filename,\%f,$cdom,$cnum);
1615: return $reply if ($reply ne 'ok');
1616: $reply = &Apache::lonnet::put($stype.'_spreadsheets',
1617: {$filename => $ENV{'user.name'}.'@'.$ENV{'user.domain'}},
1618: $cdom,$cnum);
1619: return $reply if ($reply ne 'ok');
1620: if ($makedef) {
1621: $reply = &Apache::lonnet::put('environment',
1622: {'spreadsheet_default_'.$stype => $filename },
1623: $cdom,$cnum);
1624: return $reply if ($reply ne 'ok');
1625: }
1626: if ($self->is_default()) {
1627: &Apache::lonnet::expirespread('','',$self->{'type'},'');
1628: if ($self->{'type'} eq 'assesscalc') {
1629: &Apache::lonnet::expirespread('','','studentcalc','');
1630: }
1631: }
1632: return $reply;
1633: }
1634: return 'unauthorized';
1635: }
1636:
1637: } # end of scope for %spreadsheets
1638:
1639: sub save_tmp {
1640: my $self = shift;
1641: my $filename=$ENV{'user.name'}.'_'.
1642: $ENV{'user.domain'}.'_spreadsheet_'.$self->{'usymb'}.'_'.
1643: $self->{'filename'};
1644: $filename=~s/\W/\_/g;
1645: $filename=$Apache::lonnet::tmpdir.$filename.'.tmp';
1646: $self->temporary(1);
1647: my $fh;
1648: if ($fh=Apache::File->new('>'.$filename)) {
1649: my %f = $self->formulas();
1650: while( my ($cell,$formula) = each(%f)) {
1651: next if ($formula eq 'import');
1652: print $fh &Apache::lonnet::escape($cell)."=".
1653: &Apache::lonnet::escape($formula)."\n";
1654: }
1655: $fh->close();
1656: }
1657: }
1658:
1659: sub load_tmp {
1660: my $self = shift;
1661: my $filename=$ENV{'user.name'}.'_'.
1662: $ENV{'user.domain'}.'_spreadsheet_'.$self->{'usymb'}.'_'.
1663: $self->{'filename'};
1664: $filename=~s/\W/\_/g;
1665: $filename=$Apache::lonnet::tmpdir.$filename.'.tmp';
1666: my %formulas = ();
1667: if (my $spreadsheet_file = Apache::File->new($filename)) {
1668: while (<$spreadsheet_file>) {
1669: chomp;
1670: my ($cell,$formula) = split(/=/);
1671: $cell = &Apache::lonnet::unescape($cell);
1672: $formula = &Apache::lonnet::unescape($formula);
1673: $formulas{$cell} = $formula;
1674: }
1675: $spreadsheet_file->close();
1676: }
1677: # flag the sheet as temporary
1678: $self->temporary(1);
1679: $self->formulas(\%formulas);
1680: $self->set_row_sources();
1681: $self->set_row_numbers();
1682: return;
1683: }
1684:
1685: sub temporary {
1686: my $self=shift;
1687: if (@_) {
1688: ($self->{'temporary'})= @_;
1689: }
1690: return $self->{'temporary'};
1691: }
1692:
1693: sub modify_cell {
1694: # studentcalc overrides this
1695: my $self = shift;
1696: my ($cell,$formula) = @_;
1697: if ($cell =~ /([A-z])\-/) {
1698: $cell = 'template_'.$1;
1699: } elsif ($cell !~ /^([A-z](\d+)|template_[A-z])$/) {
1700: return;
1701: }
1702: $self->set_formula($cell,$formula);
1703: $self->rebuild_stats();
1704: return;
1705: }
1706:
1707: ###########################################
1708: # othersheets: Returns the list of other spreadsheets available
1709: ###########################################
1710: sub othersheets {
1711: my $self = shift();
1712: my ($stype) = @_;
1713: $stype = $self->{'type'} if (! defined($stype) || $stype !~ /calc$/);
1714: #
1715: my @alternatives=();
1716: my %results=&Apache::lonnet::dump($stype.'_spreadsheets',
1717: $self->{'cdom'}, $self->{'cnum'});
1718: my ($tmp) = keys(%results);
1719: if ($tmp =~ /^(con_lost|error|no_such_host)/i ) {
1720: @alternatives = ('Default');
1721: } else {
1722: @alternatives = ('Default', sort (keys(%results)));
1723: }
1724: return @alternatives;
1725: }
1726:
1727: sub blackout {
1728: my $self = shift;
1729: $self->{'blackout'} = $_[0] if (@_);
1730: return $self->{'blackout'};
1731: }
1732:
1733: sub get_row {
1734: my $self = shift;
1735: my ($n)=@_;
1736: my @cols=();
1737: foreach my $col (@UC_Columns,@LC_Columns) {
1738: my $cell = $col.$n;
1739: push(@cols,{ name => $cell,
1740: formula => $self->formula($cell),
1741: value => $self->value($cell)});
1742: }
1743: return @cols;
1744: }
1745:
1746: sub get_template_row {
1747: my $self = shift;
1748: my @cols=();
1749: foreach my $col (@UC_Columns,@LC_Columns) {
1750: my $cell = 'template_'.$col;
1751: push(@cols,{ name => $cell,
1752: formula => $self->formula($cell),
1753: value => $self->formula($cell) });
1754: }
1755: return @cols;
1756: }
1757:
1758: sub need_to_save {
1759: my $self = shift;
1760: if ($self->{'new_rows'} && ! $self->temporary()) {
1761: return 1;
1762: }
1763: return 0;
1764: }
1765:
1766: sub get_row_number_from_key {
1767: my $self = shift;
1768: my ($key) = @_;
1769: if (! exists($self->{'row_numbers'}->{$key}) ||
1770: ! defined($self->{'row_numbers'}->{$key})) {
1771: # I used to set $f here to the new value, but the key passed for lookup
1772: # may not be the key we need to save
1773: $self->{'maxrow'}++;
1774: $self->{'row_numbers'}->{$key} = $self->{'maxrow'};
1775: # $self->logthis('added row '.$self->{'row_numbers'}->{$key}.
1776: # ' for '.$key);
1777: $self->{'new_rows'} = 1;
1778: }
1779: return $self->{'row_numbers'}->{$key};
1780: }
1781:
1782: 1;
1783:
1784: __END__
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