1: package Apache::run;
2: #
3: # $Id: run.pm,v 1.26 2002/04/10 15:22:02 albertel Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27:
28: use HTML::Entities;
29:
30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
31: my %_LONCAPA_INTERNAL_oldexpressions=();
32: my $i=0;
33: while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
34: $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
35: $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
36: if ($i++ > 10 ) { last; }
37: }
38: ENDEVALUATE
39:
40: sub evaluate {
41: my ($expression,$safeeval,$decls) = @_;
42: unless (defined($expression)) { return ''; }
43: if (!$Apache::lonxml::evaluate) { return $expression; }
44: my $result = '';
45: $@='';
46: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
47: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
48: # $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
49: my $error=$@;
50: if ($@ eq '') {
51: $result = $safeeval->reval('return $_;');
52: chomp $result;
53: } else {
54: &Apache::lonxml::error('substitution on <pre>'.$expression.
55: '</pre> with <pre>'.$decls.
56: '</pre> caused <pre>'.$error);
57: }
58: return $result
59: }
60:
61: sub run {
62: my ($code,$safeeval,$hideerrors) = @_;
63: # print "inside run\n";
64: $@='';
65: my (@result)=$safeeval->reval($code);
66: my $error=$@;
67: if ($error ne '' && !$hideerrors) {
68: &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).
69: '</pre> occured while running <pre>'.
70: &HTML::Entities::encode($code).'</pre>');
71: }
72: if ( $#result < '1') {
73: return $result[0];
74: } else {
75: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
76: return (@result);
77: }
78: }
79:
80: sub dump {
81: my ($target,$safeeval)=@_;
82: my $dump='';
83: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
84: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
85: if ($safeeval->reval('defined($'.$symname.')')) {
86: $dump.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
87: }
88: if ($safeeval->reval('defined(@'.$symname.')')) {
89: $dump.='@'.$symname.'=('.
90: $safeeval->reval('join(",",@'.$symname.')').")\n";
91: }
92: if ($safeeval->reval('defined(%'.$symname.')')) {
93: $dump.='%'.$symname.'=(';
94: $dump.=$safeeval->reval('join(",",map { $_."=>".$'.
95: $symname.'{$_} } sort keys %'.
96: $symname.')').")\n";
97: }
98: }
99: }
100: $dump.='';
101: return $dump;
102: }
103:
104: 1;
105: __END__;
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