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- start _should_ be correct
- end tag is a horrible broken mess that doesn't work

    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: 
   12: sub register {
   13:   my $space;
   14:   my @taglist;
   15:   my $temptag;
   16:   ($space,@taglist) = @_;
   17:   foreach $temptag (@taglist) {
   18:     $Apache::lonxml::alltags{$temptag}=$space;
   19:   }
   20: }
   21: 
   22: use Apache::style;
   23: use Apache::lontexconvert;
   24: use Apache::run;
   25: use Apache::londefdef;
   26: use Apache::scripttag;
   27: #==================================================   Main subroutine: xmlparse  
   28: 
   29: sub xmlparse {
   30: 
   31:  my ($target,$content_file_string,%style_for_target) = @_;
   32:  my $pars = HTML::TokeParser->new(\$content_file_string);
   33:  my $currentstring = '';
   34:  my $finaloutput = ''; 
   35:  my $newarg = '';
   36:  my $safeeval = new Safe;
   37:  $safeeval->permit("entereval");
   38: #-------------------- Redefinition of the target in the case of compound target
   39: 
   40:  ($target, my @tenta) = split('&&',$target);
   41: 
   42: #------------------------- Stack definition (in stack we have all current tags)
   43: 
   44:  my @stack = (); 
   45:  my @parstack = ();
   46: 
   47: #------------------------------------- Parse input string (content_file_string)
   48:  
   49:  my $token;
   50:  
   51:  while ($token = $pars->get_token) {
   52:    if ($token->[0] eq 'T') {
   53:      $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
   54:    } elsif ($token->[0] eq 'S') {
   55:      # add tag to stack 	    
   56:      push (@stack,$token->[1]);
   57:      # add parameters list to another stack
   58:      push (@parstack,&parstring($token));
   59:      
   60:      if (exists $style_for_target{$token->[1]}) {
   61:        #basically recurse, but we never got more than one level down so just 
   62:        #create the new context here
   63:        my @innerstack = (); 
   64:        my @innerparstack = ();
   65:        # use style file definition
   66:        $newarg = $style_for_target{$token->[1]};       
   67:        my $pat = HTML::TokeParser->new(\$newarg);
   68:        my $tokenpat = '';
   69:        my $partstring = '';
   70: 
   71:        while  ($tokenpat = $pat->get_token) {
   72: 	 if ($tokenpat->[0] eq 'T') {
   73: 	   $partstring = $tokenpat->[1];
   74: 	 } elsif ($tokenpat->[0] eq 'S') {
   75: 	   push (@innerstack,$tokenpat->[1]);
   76: 	   push (@innerparstack,&parstring($tokenpat));
   77: 	   $partstring = &callsub("start_$tokenpat->[1]", 
   78: 				  $target, $tokenpat, \@innerparstack)
   79: 	 } elsif ($tokenpat->[0] eq 'E') {
   80: 	   #clear out any tags that didn't end
   81: 	   while ($tokenpat->[1] ne $innerstack[$#innerstack] 
   82: 		  && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;}
   83: 	   $partstring = &callsub("end_$tokenpat->[1]",
   84: 				  $target, $tokenpat, \@innerparstack)
   85: 	 }
   86: 	 #pass both the variable to the style tag, and the tag we 
   87: 	 #are processing inside the <definedtag>
   88: 	 $finaloutput .= &Apache::run::evaluate($partstring,$safeeval,
   89: 		$parstack[$#parstack].$innerparstack[$#innerparstack]);
   90: 	 if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }
   91:        }
   92:      } else {
   93:        my $result = &callsub("start_$token->[1]", $target, $token, \@parstack);
   94:        $finaloutput .= &Apache::run::evaluate($result,$safeeval,
   95: 					      $parstack[$#parstack]);
   96:      }              
   97:    } elsif ($token->[0] eq 'E')  {
   98:      # Put here check for correct final tag (to avoid existence of 
   99:      # starting tag only)
  100:      
  101:      pop @stack; 
  102:      unless (exists $style_for_target{$token->[1]}) {
  103:        my $sub="end_$token->[1]";
  104:        $finaloutput .= callsub($sub, $target, $token, \@parstack);
  105:      }
  106:      #---- end tag from the style file
  107:      if (exists $style_for_target{'/'."$token->[1]"}) {
  108:        $newarg = $style_for_target{'/'."$token->[1]"};
  109:        if (index($newarg,'script') != -1 ) {
  110:          my $pat = HTML::TokeParser->new(\$newarg);
  111:          my $tokenpat;
  112:          my $partstring = '';
  113:          my $oustring = '';
  114:          my $outputstring;
  115: 	 
  116:          while  ($tokenpat = $pat->get_token) {
  117: 	   if ($tokenpat->[0] eq 'T') {
  118: 	     $oustring .= $tokenpat->[1];
  119: 	   } elsif ($tokenpat->[0] eq 'S') {
  120:              if ($tokenpat->[1] eq 'script') {
  121:                while  ($tokenpat = $pat->get_token and $tokenpat->[1] ne 'script') {
  122: 		 if ($tokenpat->[0] eq 'S')  {
  123: 		   
  124: 		   $partstring .=  $tokenpat->[4];
  125: 		 } elsif ($tokenpat->[0] eq 'T') {
  126: 		   $partstring .=  $tokenpat->[1];
  127: 		 } elsif ($tokenpat->[0] eq 'E') {
  128: 		   $partstring .=  $tokenpat->[2];
  129: 		 }
  130: 	       }
  131: 	       
  132:                my @tempor_list = split(',',$parstack[$#parstack]);
  133:                my @te_kl = ();
  134:                my %tempor_hash = ();
  135:                map {(my $onete,my $twote) = split('=',$_); push (@te_kl,$onete); 
  136:                     $tempor_hash{$onete} = $twote} @tempor_list;
  137:                map {$partstring =~ s/\$$_/$tempor_hash{$_}/g; } @te_kl; 
  138: 	       print "want to use run\n";
  139:                &Apache::run::run($partstring,$safeeval);
  140: 	       
  141:                $partstring = '';
  142: 	     } elsif ($tokenpat->[1] eq 'evaluate') {		
  143: 	       $outputstring = &Apache::run::evaluate($tokenpat->[2]{expression},$safeeval);
  144: 	       $oustring .=  $outputstring;
  145: 	     } else {
  146: 	       $oustring .= $tokenpat->[4]; 
  147: 	     }
  148: 	   } elsif ($tokenpat->[0] eq 'E' and $tokenpat->[1] ne 'evaluate') {
  149:              $oustring .= $tokenpat->[1];    
  150: 	   }
  151:          }
  152: 	 $newarg =  $oustring;
  153:        } else {
  154:          my @very_temp = split(',',$parstack[$#parstack]);
  155:          map {my @ret= split('=',$_); $newarg =~ s/\$$ret[0]/$ret[1]/g; } @very_temp;
  156:        }
  157:        
  158:        $finaloutput .= $newarg; 
  159:      }
  160:      pop @parstack;
  161:    }
  162:  }
  163:  return $finaloutput;
  164: }
  165: 
  166: sub callsub {
  167:   my ($sub,$target,$token,@parstack)=@_;
  168:   my $currentstring='';
  169:   {
  170:     no strict 'refs';
  171:     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
  172:       #print "Calling sub $sub in $space \n";
  173:       $sub="$space\:\:$sub";
  174:       $currentstring = &$sub($target,$token,\@parstack);
  175:     } else {
  176:       #print "NOT Calling sub $sub\n";
  177:       if (defined($token->[4])) {
  178: 	$currentstring = $token->[4];
  179:       } else {
  180: 	$currentstring = $token->[2];
  181:       }
  182:     }
  183:     use strict 'refs';
  184:   }
  185:   return $currentstring;
  186: }
  187: 
  188: sub parstring {
  189:   my ($token) = @_;
  190:   my $temp='';
  191:   map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
  192:   return $temp;
  193: }
  194: 1;
  195: __END__