1: package Apache::run;
2: #
3: # $Id: run.pm,v 1.21 2001/11/29 19:03:58 www 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: sub evaluateold {
29: my ($expression,$safeeval,$decls) = @_;
30: # print "inside2 evaluate $decls with $expression<br />\n";
31: # gerd's old method interpolates unset vars
32: # $safeeval->reval('return qq('.$expression.');');
33: unless (defined $expression) { return ''; }
34: my $result = '';
35: $@='';
36: $safeeval->reval('$_=q|'.$expression.'|;');
37: if ($@ eq '') {
38: $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}');
39: if ($@ eq '') {
40: $result = $safeeval->reval('return $_;');
41: } else {
42: &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");
43: }
44: } else {
45: &Apache::lonxml::error("defining:$expression:caused");
46: }
47: if ($@ ne '') {&Apache::lonxml::error($@);}
48: return $result
49: }
50:
51: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
52: my %oldexpressions=();
53: while (!$oldexpressions{$_}) {
54: $oldexpressions{$_}=1;
55: $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
56: }
57: ENDEVALUATE
58:
59: sub evaluate {
60: my ($expression,$safeeval,$decls) = @_;
61: unless (defined $expression) { return ''; }
62: if (!$Apache::lonxml::evaluate) { return $expression; }
63: my $result = '';
64: $@='';
65: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
66: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
67: # $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
68: if ($@ eq '') {
69: $result = $safeeval->reval('return $_;');
70: chomp $result;
71: } else {
72: &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");
73: }
74: return $result
75: }
76:
77: sub run {
78: my ($code,$safeeval,$hideerrors) = @_;
79: # print "inside run\n";
80: $@='';
81: my (@result)=$safeeval->reval($code);
82: if ($@ ne '' && !$hideerrors) {
83: &Apache::lonxml::error(":$code:caused");
84: &Apache::lonxml::error($@);
85: }
86: if ( $#result < '1') {
87: return $result[0];
88: } else {
89: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
90: return (@result);
91: }
92: }
93:
94: sub dump {
95: my ($target,$safeeval)=@_;
96: my $dump='';
97: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
98: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
99: if ($safeeval->reval('defined($'.$symname.')')) {
100: $dump.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
101: }
102: if ($safeeval->reval('defined @'.$symname)) {
103: $dump.='@'.$symname.'=('.
104: $safeeval->reval('join(",",@'.$symname.')').")\n";
105: }
106: if ($safeeval->reval('defined %'.$symname)) {
107: $dump.='%'.$symname.'=(';
108: $dump.=$safeeval->reval('join(",",map { $_."=>".$'.
109: $symname.'{$_} } sort keys %'.
110: $symname.')').")\n";
111: }
112: }
113: }
114: $dump.='';
115: return $dump;
116: }
117:
118: 1;
119: __END__;
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