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- fixed bug with poorly formed xml documents

    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:  $safeeval->deny(":base_io");
   43: #need to inspect this class of ops
   44: # $safeeval->deny(":base_orig");
   45:  if ( $safeinit ne '') {&Apache::run::run($safeinit,$safeeval);}
   46: #-------------------- Redefinition of the target in the case of compound target
   47: 
   48:  ($target, my @tenta) = split('&&',$target);
   49: 
   50:  my @stack = (); 
   51:  my @parstack = ();
   52:  &initdepth;
   53:  my $token;
   54:  while ( $#pars > -1 ) {
   55:    while ($token = $pars[$#pars]->get_token) {
   56:      if ($token->[0] eq 'T') {
   57:        $result=$token->[1];
   58: #       $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
   59:      } elsif ($token->[0] eq 'S') {
   60:        # add tag to stack 	    
   61:        push (@stack,$token->[1]);
   62:        # add parameters list to another stack
   63:        push (@parstack,&parstring($token));
   64:        &increasedepth($token);       
   65:        if (exists $style_for_target{$token->[1]}) {
   66: 	 $finaloutput .= &recurse($style_for_target{$token->[1]},
   67: 				  $target,$safeeval,\%style_for_target,
   68: 				  @parstack);
   69:        } else {
   70: 	 $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
   71: 			       \@pars, $safeeval, \%style_for_target);
   72:        }              
   73:      } elsif ($token->[0] eq 'E')  {
   74:        #clear out any tags that didn't end
   75:        while ($token->[1] ne $stack[$#stack] 
   76: 	      && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
   77:        
   78:        if (exists $style_for_target{'/'."$token->[1]"}) {
   79: 	 $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
   80: 				  $target,$safeeval,\%style_for_target,
   81: 				  @parstack);
   82:        } else {
   83: 	 $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
   84: 			       \@pars,$safeeval, \%style_for_target);
   85:        }
   86:      }
   87:      if ($result ne "" ) {
   88:        if ( $#parstack > -1 ) { 
   89: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,
   90: 						$parstack[$#parstack]);
   91:        } else {
   92: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
   93:        }
   94:        $result = '';
   95:      }
   96:      if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
   97:    }
   98:    pop @pars;
   99:  }
  100:  return $finaloutput;
  101: }
  102: 
  103: sub recurse {
  104:   
  105:   my @innerstack = (); 
  106:   my @innerparstack = ();
  107:   my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
  108:   my @pat = ();
  109:   push (@pat,HTML::TokeParser->new(\$newarg));
  110:   my $tokenpat;
  111:   my $partstring = '';
  112:   my $output='';
  113:   my $decls='';
  114:   while ( $#pat > -1 ) {
  115:     while  ($tokenpat = $pat[$#pat]->get_token) {
  116:       if ($tokenpat->[0] eq 'T') {
  117: 	$partstring = $tokenpat->[1];
  118:       } elsif ($tokenpat->[0] eq 'S') {
  119: 	push (@innerstack,$tokenpat->[1]);
  120: 	push (@innerparstack,&parstring($tokenpat));
  121: 	&increasedepth($tokenpat);
  122: 	$partstring = &callsub("start_$tokenpat->[1]", 
  123: 			       $target, $tokenpat, \@innerparstack,
  124: 			       \@pat, $safeeval, $style_for_target);
  125:       } elsif ($tokenpat->[0] eq 'E') {
  126: 	#clear out any tags that didn't end
  127: 	while ($tokenpat->[1] ne $innerstack[$#innerstack] 
  128: 	       && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
  129: 					&decreasedepth($tokenpat);}
  130: 	$partstring = &callsub("end_$tokenpat->[1]",
  131: 			       $target, $tokenpat, \@innerparstack,
  132: 			       \@pat, $safeeval, $style_for_target);
  133:       }
  134:       #pass both the variable to the style tag, and the tag we 
  135:       #are processing inside the <definedtag>
  136:       if ( $partstring ne "" ) {
  137: 	if ( $#parstack > -1 ) { 
  138: 	  if ( $#innerparstack > -1 ) { 
  139: 	    $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
  140: 	  } else {
  141: 	    $decls= $parstack[$#parstack];
  142: 	  }
  143: 	} else {
  144: 	  if ( $#innerparstack > -1 ) { 
  145: 	    $decls=$innerparstack[$#innerparstack];
  146: 	  } else {
  147: 	    $decls='';
  148: 	  }
  149: 	}
  150: 	$output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
  151: 	$partstring = '';
  152:       }
  153:       if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
  154: 				 &decreasedepth($tokenpat);}
  155:     }
  156:     pop @pat;
  157:   }
  158:   return $output;
  159: }
  160: 
  161: sub callsub {
  162:   my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
  163:   my $currentstring='';
  164:   {
  165:     no strict 'refs';
  166:     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
  167:       #print "Calling sub $sub in $space<br>\n";
  168:       $sub="$space\:\:$sub";
  169:       $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
  170:       $currentstring = &$sub($target,$token,$parstack,$parser,
  171: 			     $safeeval,$style);
  172:     } else {
  173:       #print "NOT Calling sub $sub<br>\n";
  174:       if (defined($token->[4])) {
  175: 	$currentstring = $token->[4];
  176:       } else {
  177: 	$currentstring = $token->[2];
  178:       }
  179:     }
  180:     use strict 'refs';
  181:   }
  182:   return $currentstring;
  183: }
  184: 
  185: sub initdepth {
  186:   @Apache::lonxml::depthcounter=();
  187:   $Apache::lonxml::depth=-1;
  188:   $Apache::lonxml::olddepth=-1;
  189: }
  190: 
  191: sub increasedepth {
  192:   my ($token) = @_;
  193:   if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
  194:     $#Apache::lonxml::depthcounter--;
  195:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  196:   }
  197:   $Apache::lonxml::depth++;
  198: #  print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
  199:   $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
  200:   if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
  201:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  202:   }
  203: }
  204: 
  205: sub decreasedepth {
  206:   my ($token) = @_;
  207:   $Apache::lonxml::depth--;
  208: #  print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
  209: }
  210: 
  211: sub get_all_text {
  212: 
  213:  my($tag,$pars)= @_;
  214:  my $depth=0;
  215:  my $token;
  216:  my $result='';
  217:  while (($depth >=0) && ($token = $pars->get_token)) {
  218:    if ($token->[0] eq 'T') {
  219:      $result.=$token->[1];
  220:    } elsif ($token->[0] eq 'S') {
  221:      if ($token->[1] eq $tag) { $depth++; }
  222:      $result.=$token->[4];
  223:    } elsif ($token->[0] eq 'E')  {
  224:      if ($token->[1] eq $tag) { $depth--; }
  225:      #skip sending back the last end tag
  226:      if ($depth > -1) { $result.=$token->[2]; }
  227:    }
  228:  }
  229:  return $result
  230: }
  231: 
  232: 
  233: sub parstring {
  234:   my ($token) = @_;
  235:   my $temp='';
  236:   map {
  237:     if ($_=~/\w+/) {
  238:       $temp .= "my \$$_=\"$token->[2]->{$_}\";"
  239:     }
  240:   } @{$token->[3]};
  241:   return $temp;
  242: }
  243: 1;
  244: __END__
  245: 
  246: 
  247: 
  248: 
  249: