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- safeinit string now passed

    1: # The LearningOnline Network with CAPA
    2: # XML Parser Module 
    3: #
    4: # last modified 06/26/00 by Alexander Sakharuk
    5: 
    6: package Apache::lonxml; 
    7: 
    8: use strict;
    9: use HTML::TokeParser;
   10: use Safe;
   11: use Opcode;
   12: 
   13: sub register {
   14:   my $space;
   15:   my @taglist;
   16:   my $temptag;
   17:   ($space,@taglist) = @_;
   18:   foreach $temptag (@taglist) {
   19:     $Apache::lonxml::alltags{$temptag}=$space;
   20:   }
   21: }
   22:                                      
   23: use Apache::style;
   24: use Apache::lontexconvert;
   25: use Apache::run;
   26: use Apache::londefdef;
   27: use Apache::scripttag;
   28: #==================================================   Main subroutine: xmlparse  
   29: 
   30: sub xmlparse {
   31: 
   32:  my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
   33:  my @pars = ();
   34:  push (@pars,HTML::TokeParser->new(\$content_file_string));
   35:  my $currentstring = '';
   36:  my $finaloutput = ''; 
   37:  my $newarg = '';
   38:  my $result;
   39:  my $safeeval = new Safe;
   40:  $safeeval->permit("entereval");
   41:  $safeeval->permit(":base_math");
   42:  if ( $safeinit ne '') {&Apache::run::run($safeinit,$safeeval);}
   43: #-------------------- Redefinition of the target in the case of compound target
   44: 
   45:  ($target, my @tenta) = split('&&',$target);
   46: 
   47:  my @stack = (); 
   48:  my @parstack = ();
   49:  &initdepth;
   50:  my $token;
   51:  while ( $#pars > -1 ) {
   52:    while ($token = $pars[$#pars]->get_token) {
   53:      if ($token->[0] eq 'T') {
   54:        $result=$token->[1];
   55: #       $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
   56:      } elsif ($token->[0] eq 'S') {
   57:        # add tag to stack 	    
   58:        push (@stack,$token->[1]);
   59:        # add parameters list to another stack
   60:        push (@parstack,&parstring($token));
   61:        &increasedepth();       
   62:        if (exists $style_for_target{$token->[1]}) {
   63: 	 $finaloutput .= &recurse($style_for_target{$token->[1]},
   64: 				  $target,$safeeval,\%style_for_target,
   65: 				  @parstack);
   66:        } else {
   67: 	 $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
   68: 			       \@pars, $safeeval, \%style_for_target);
   69:        }              
   70:      } elsif ($token->[0] eq 'E')  {
   71:        #clear out any tags that didn't end
   72:        while ($token->[1] ne $stack[$#stack] 
   73: 	      && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth;}
   74:        
   75:        if (exists $style_for_target{'/'."$token->[1]"}) {
   76: 	 $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
   77: 				  $target,$safeeval,\%style_for_target,
   78: 				  @parstack);
   79:        } else {
   80: 	 $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
   81: 			       \@pars,$safeeval, \%style_for_target);
   82:        }
   83:      }
   84:      if ($result ne "" ) {
   85:        if ( $#parstack > -1 ) { 
   86: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,
   87: 						$parstack[$#parstack]);
   88:        } else {
   89: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
   90:        }
   91:        $result = '';
   92:      }
   93:      if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth;}
   94:    }
   95:    pop @pars;
   96:  }
   97:  return $finaloutput;
   98: }
   99: 
  100: sub recurse {
  101:   
  102:   my @innerstack = (); 
  103:   my @innerparstack = ();
  104:   my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
  105:   my @pat = ();
  106:   push (@pat,HTML::TokeParser->new(\$newarg));
  107:   my $tokenpat;
  108:   my $partstring = '';
  109:   my $output='';
  110:   my $decls='';
  111:   while ( $#pat > -1 ) {
  112:     while  ($tokenpat = $pat[$#pat]->get_token) {
  113:       if ($tokenpat->[0] eq 'T') {
  114: 	$partstring = $tokenpat->[1];
  115:       } elsif ($tokenpat->[0] eq 'S') {
  116: 	push (@innerstack,$tokenpat->[1]);
  117: 	push (@innerparstack,&parstring($tokenpat));
  118: 	&increasedepth();
  119: 	$partstring = &callsub("start_$tokenpat->[1]", 
  120: 			       $target, $tokenpat, \@innerparstack,
  121: 			       \@pat, $safeeval, $style_for_target);
  122:       } elsif ($tokenpat->[0] eq 'E') {
  123: 	#clear out any tags that didn't end
  124: 	while ($tokenpat->[1] ne $innerstack[$#innerstack] 
  125: 	       && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
  126: 					&decreasedepth;}
  127: 	$partstring = &callsub("end_$tokenpat->[1]",
  128: 			       $target, $tokenpat, \@innerparstack,
  129: 			       \@pat, $safeeval, $style_for_target);
  130:       }
  131:       #pass both the variable to the style tag, and the tag we 
  132:       #are processing inside the <definedtag>
  133:       if ( $partstring ne "" ) {
  134: 	if ( $#parstack > -1 ) { 
  135: 	  if ( $#innerparstack > -1 ) { 
  136: 	    $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
  137: 	  } else {
  138: 	    $decls= $parstack[$#parstack];
  139: 	  }
  140: 	} else {
  141: 	  if ( $#innerparstack > -1 ) { 
  142: 	    $decls=$innerparstack[$#innerparstack];
  143: 	  } else {
  144: 	    $decls='';
  145: 	  }
  146: 	}
  147: 	$output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
  148: 	$partstring = '';
  149:       }
  150:       if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
  151: 				 &decreasedepth;}
  152:     }
  153:     pop @pat;
  154:   }
  155:   return $output;
  156: }
  157: 
  158: sub callsub {
  159:   my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
  160:   my $currentstring='';
  161:   {
  162:     no strict 'refs';
  163:     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
  164:       #print "Calling sub $sub in $space \n";
  165:       $sub="$space\:\:$sub";
  166:       $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
  167:       $currentstring = &$sub($target,$token,$parstack,$parser,
  168: 			     $safeeval,$style);
  169:     } else {
  170:       #print "NOT Calling sub $sub\n";
  171:       if (defined($token->[4])) {
  172: 	$currentstring = $token->[4];
  173:       } else {
  174: 	$currentstring = $token->[2];
  175:       }
  176:     }
  177:     use strict 'refs';
  178:   }
  179:   return $currentstring;
  180: }
  181: 
  182: sub initdepth {
  183:   @Apache::lonxml::depthcounter=();
  184:   $Apache::lonxml::depth=-1;
  185:   $Apache::lonxml::olddepth=-1;
  186: }
  187: 
  188: sub increasedepth {
  189:   if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
  190:     $#Apache::lonxml::depthcounter--;
  191:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  192:   }
  193:   $Apache::lonxml::depth++;
  194:   $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
  195:   if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
  196:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  197:   }
  198: }
  199: 
  200: sub decreasedepth {
  201:   $Apache::lonxml::depth--;
  202: }
  203: 
  204: sub parstring {
  205:   my ($token) = @_;
  206:   my $temp='';
  207:   map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
  208:   return $temp;
  209: }
  210: 1;
  211: __END__
  212: 
  213: 
  214: 
  215: 
  216: