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- added style to passed args
- implemented parserlib tag

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