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- did up some edittags

    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 = ();
   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:  $safeeval->permit(":base_math");
   42: #-------------------- Redefinition of the target in the case of compound target
   43: 
   44:  ($target, my @tenta) = split('&&',$target);
   45: 
   46:  my @stack = (); 
   47:  my @parstack = ();
   48:  &initdepth;
   49:  my $token;
   50:  while ( $#pars > -1 ) {
   51:    while ($token = $pars[$#pars]->get_token) {
   52:      if ($token->[0] eq 'T') {
   53:        $result=$token->[1];
   54: #       $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
   55:      } elsif ($token->[0] eq 'S') {
   56:        # add tag to stack 	    
   57:        push (@stack,$token->[1]);
   58:        # add parameters list to another stack
   59:        push (@parstack,&parstring($token));
   60:        &increasedepth();       
   61:        if (exists $style_for_target{$token->[1]}) {
   62: 	 $finaloutput .= &recurse($style_for_target{$token->[1]},
   63: 				  $target,$safeeval,\%style_for_target,
   64: 				  @parstack);
   65:        } else {
   66: 	 $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
   67: 			       \@pars, $safeeval, \%style_for_target);
   68:        }              
   69:      } elsif ($token->[0] eq 'E')  {
   70:        #clear out any tags that didn't end
   71:        while ($token->[1] ne $stack[$#stack] 
   72: 	      && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth;}
   73:        
   74:        if (exists $style_for_target{'/'."$token->[1]"}) {
   75: 	 $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
   76: 				  $target,$safeeval,\%style_for_target,
   77: 				  @parstack);
   78:        } else {
   79: 	 $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
   80: 			       \@pars,$safeeval, \%style_for_target);
   81:        }
   82:      }
   83:      if ($result ne "" ) {
   84:        if ( $#parstack > -1 ) { 
   85: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,
   86: 						$parstack[$#parstack]);
   87:        } else {
   88: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
   89:        }
   90:        $result = '';
   91:      }
   92:      if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth;}
   93:    }
   94:    pop @pars;
   95:  }
   96:  return $finaloutput;
   97: }
   98: 
   99: sub recurse {
  100:   
  101:   my @innerstack = (); 
  102:   my @innerparstack = ();
  103:   my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
  104:   my @pat = ();
  105:   push (@pat,HTML::TokeParser->new(\$newarg));
  106:   my $tokenpat;
  107:   my $partstring = '';
  108:   my $output='';
  109:   my $decls='';
  110:   while ( $#pat > -1 ) {
  111:     while  ($tokenpat = $pat[$#pat]->get_token) {
  112:       if ($tokenpat->[0] eq 'T') {
  113: 	$partstring = $tokenpat->[1];
  114:       } elsif ($tokenpat->[0] eq 'S') {
  115: 	push (@innerstack,$tokenpat->[1]);
  116: 	push (@innerparstack,&parstring($tokenpat));
  117: 	&increasedepth();
  118: 	$partstring = &callsub("start_$tokenpat->[1]", 
  119: 			       $target, $tokenpat, \@innerparstack,
  120: 			       \@pat, $safeeval, $style_for_target);
  121:       } elsif ($tokenpat->[0] eq 'E') {
  122: 	#clear out any tags that didn't end
  123: 	while ($tokenpat->[1] ne $innerstack[$#innerstack] 
  124: 	       && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
  125: 					&decreasedepth;}
  126: 	$partstring = &callsub("end_$tokenpat->[1]",
  127: 			       $target, $tokenpat, \@innerparstack,
  128: 			       \@pat, $safeeval, $style_for_target);
  129:       }
  130:       #pass both the variable to the style tag, and the tag we 
  131:       #are processing inside the <definedtag>
  132:       if ( $partstring ne "" ) {
  133: 	if ( $#parstack > -1 ) { 
  134: 	  if ( $#innerparstack > -1 ) { 
  135: 	    $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
  136: 	  } else {
  137: 	    $decls= $parstack[$#parstack];
  138: 	  }
  139: 	} else {
  140: 	  if ( $#innerparstack > -1 ) { 
  141: 	    $decls=$innerparstack[$#innerparstack];
  142: 	  } else {
  143: 	    $decls='';
  144: 	  }
  145: 	}
  146: 	$output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
  147: 	$partstring = '';
  148:       }
  149:       if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
  150: 				 &decreasedepth;}
  151:     }
  152:     pop @pat;
  153:   }
  154:   return $output;
  155: }
  156: 
  157: sub callsub {
  158:   my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
  159:   my $currentstring='';
  160:   {
  161:     no strict 'refs';
  162:     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
  163:       #print "Calling sub $sub in $space \n";
  164:       $sub="$space\:\:$sub";
  165:       $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
  166:       $currentstring = &$sub($target,$token,$parstack,$parser,
  167: 			     $safeeval,$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 initdepth {
  182:   @Apache::lonxml::depthcounter=();
  183:   $Apache::lonxml::depth=-1;
  184:   $Apache::lonxml::olddepth=-1;
  185: }
  186: 
  187: sub increasedepth {
  188:   if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
  189:     $#Apache::lonxml::depthcounter--;
  190:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  191:   }
  192:   $Apache::lonxml::depth++;
  193:   $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
  194:   if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
  195:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  196:   }
  197: }
  198: 
  199: sub decreasedepth {
  200:   $Apache::lonxml::depth--;
  201: }
  202: 
  203: sub parstring {
  204:   my ($token) = @_;
  205:   my $temp='';
  206:   map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
  207:   return $temp;
  208: }
  209: 1;
  210: __END__
  211: 
  212: 
  213: 
  214: 
  215: