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Up to [LON-CAPA] / loncom / xml

- large changes to start generating a editing enviroment
- <script> <scriptlib> <parserlib> work in edit in envrioment
- callsub needs to be reorganized
- added evaluate global to lonxml, turns off evaluation of $var

    1: package Apache::run;
    2: 
    3: sub evaluateold {
    4:   my ($expression,$safeeval,$decls) = @_;
    5: # print "inside2 evaluate $decls with $expression<br />\n";
    6: # gerd's old method interpolates unset vars
    7: # $safeeval->reval('return qq('.$expression.');');
    8:   unless (defined $expression) { return ''; }
    9:   my $result = '';
   10:   $@='';
   11:   $safeeval->reval('$_=q|'.$expression.'|;');
   12:   if ($@ eq '') {
   13:     $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}');
   14:     if ($@ eq '') {
   15:       $result = $safeeval->reval('return $_;');
   16:     } else {
   17:       &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");
   18:     }
   19:   } else {
   20:     &Apache::lonxml::error("defining:$expression:caused");
   21:   }
   22:   if ($@ ne '') {&Apache::lonxml::error($@);}
   23:   return $result
   24: }
   25: 
   26: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
   27:   my %oldexpressions=();
   28:   while (!$oldexpressions{$_}) {
   29:     $oldexpressions{$_}=1;
   30:     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
   31:   }
   32: ENDEVALUATE
   33: 
   34: sub evaluate {
   35:   my ($expression,$safeeval,$decls) = @_;
   36:   unless (defined $expression) { return ''; }
   37:   if (!$Apache::lonxml::evaluate) { return $expression; }
   38:   my $result = '';
   39:   $@='';
   40:   print $decls
   41:   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
   42: 		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
   43: #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
   44:   if ($@ eq '') {
   45:     $result = $safeeval->reval('return $_;');
   46:     chomp $result;
   47:   } else {
   48:     &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");
   49:   }  
   50:   return $result
   51: }
   52: 
   53: sub run {
   54:   my ($code,$safeeval) = @_;
   55: #  print "inside run\n";
   56:   $@='';
   57:   my (@result)=$safeeval->reval($code);
   58:   if ($@ ne '') { 
   59:     &Apache::lonxml::error(":$code:caused"); 
   60:     &Apache::lonxml::error($@); 
   61:   }
   62:   if ( $#result < '1') {
   63:     return $result[0];
   64:   } else {
   65:     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
   66:     return (@result);
   67:   }
   68: }
   69: 
   70: 1;
   71: __END__;