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Annotation of loncom/xml/lonxml.pm, revision 1.9

1.2       sakharuk    1: # The LearningOnline Network with CAPA
1.3       sakharuk    2: # XML Parser Module 
1.2       sakharuk    3: #
1.3       sakharuk    4: # last modified 06/26/00 by Alexander Sakharuk
1.2       sakharuk    5: 
1.4       albertel    6: package Apache::lonxml; 
1.1       sakharuk    7: 
                      8: use strict;
                      9: use HTML::TokeParser;
1.3       sakharuk   10: use Safe;
1.7       albertel   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}=$space;
                     19:   }
                     20: }
                     21: 
1.4       albertel   22: use Apache::style;
1.3       sakharuk   23: use Apache::lontexconvert;
1.7       albertel   24: use Apache::run;
1.4       albertel   25: use Apache::londefdef;
1.7       albertel   26: use Apache::scripttag;
1.3       sakharuk   27: #==================================================   Main subroutine: xmlparse  
                     28: 
                     29: sub xmlparse {
                     30: 
                     31:  my ($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;
1.6       albertel   37:  $safeeval->permit("entereval");
1.3       sakharuk   38: #-------------------- Redefinition of the target in the case of compound target
                     39: 
                     40:  ($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 $token;
1.5       albertel   50:  
1.3       sakharuk   51:  while ($token = $pars->get_token) {
1.5       albertel   52:    if ($token->[0] eq 'T') {
1.7       albertel   53:      $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
1.5       albertel   54:    } elsif ($token->[0] eq 'S') {
1.7       albertel   55:      # add tag to stack 	    
1.5       albertel   56:      push (@stack,$token->[1]);
1.7       albertel   57:      # add parameters list to another stack
1.8       albertel   58:      push (@parstack,&parstring($token));
1.5       albertel   59:      
1.6       albertel   60:      if (exists $style_for_target{$token->[1]}) {
1.8       albertel   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 = ();
1.7       albertel   65:        # use style file definition
1.8       albertel   66:        $newarg = $style_for_target{$token->[1]};       
1.7       albertel   67:        my $pat = HTML::TokeParser->new(\$newarg);
                     68:        my $tokenpat = '';
                     69:        my $partstring = '';
1.8       albertel   70: 
1.7       albertel   71:        while  ($tokenpat = $pat->get_token) {
                     72: 	 if ($tokenpat->[0] eq 'T') {
                     73: 	   $partstring = $tokenpat->[1];
                     74: 	 } elsif ($tokenpat->[0] eq 'S') {
1.8       albertel   75: 	   push (@innerstack,$tokenpat->[1]);
                     76: 	   push (@innerparstack,&parstring($tokenpat));
                     77: 	   $partstring = &callsub("start_$tokenpat->[1]", 
                     78: 				  $target, $tokenpat, \@innerparstack)
1.7       albertel   79: 	 } elsif ($tokenpat->[0] eq 'E') {
1.8       albertel   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)
1.5       albertel   85: 	 }
1.8       albertel   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; }
1.2       sakharuk   91:        }
1.5       albertel   92:      } else {
1.8       albertel   93:        my $result = &callsub("start_$token->[1]", $target, $token, \@parstack);
                     94:        $finaloutput .= &Apache::run::evaluate($result,$safeeval,
                     95: 					      $parstack[$#parstack]);
1.5       albertel   96:      }              
                     97:    } elsif ($token->[0] eq 'E')  {
1.9     ! albertel   98:      #clear out any tags that didn't end
        !            99:      while ($token->[1] ne $stack[$#stack] 
        !           100: 	    && ($#stack > 0)) {pop @stack;pop @parstack;}
        !           101: 
1.3       sakharuk  102:      if (exists $style_for_target{'/'."$token->[1]"}) {
1.9     ! albertel  103:        my @innerstack = (); 
        !           104:        my @innerparstack = ();
1.3       sakharuk  105:        $newarg = $style_for_target{'/'."$token->[1]"};
1.9     ! albertel  106:        my $pat = HTML::TokeParser->new(\$newarg);
        !           107:        my $tokenpat;
        !           108:        my $partstring = '';
        !           109:        
        !           110:        while  ($tokenpat = $pat->get_token) {
        !           111: 	 if ($tokenpat->[0] eq 'T') {
        !           112: 	   $partstring .= $tokenpat->[1];
        !           113: 	 } elsif ($tokenpat->[0] eq 'S') {
        !           114: 	   push (@innerstack,$tokenpat->[1]);
        !           115: 	   push (@innerparstack,&parstring($tokenpat));
        !           116: 	   $partstring = &callsub("start_$tokenpat->[1]", 
        !           117: 				  $target, $tokenpat, \@innerparstack)
        !           118: 	 } elsif ($tokenpat->[0] eq 'E') {
        !           119: 	   #clear out any tags that didn't end
        !           120: 	   while ($tokenpat->[1] ne $innerstack[$#innerstack] 
        !           121: 		  && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;}
        !           122: 	   $partstring = &callsub("end_$tokenpat->[1]",
        !           123: 				  $target, $tokenpat, \@innerparstack)
        !           124: 	 }
        !           125: 	 #pass both the variable to the style tag, and the tag we 
        !           126: 	 #are processing inside the <definedtag>
        !           127: 	 $finaloutput .= &Apache::run::evaluate($partstring,$safeeval,
        !           128: 		$parstack[$#parstack].$innerparstack[$#innerparstack]);
        !           129: 	 if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }
1.2       sakharuk  130:        }
1.9     ! albertel  131:      } else {
        !           132:        my $result = &callsub("start_$token->[1]", $target, $token, \@parstack);
        !           133:        $finaloutput .= &Apache::run::evaluate($result,$safeeval,
        !           134: 					      $parstack[$#parstack]);
1.2       sakharuk  135:      }
1.9     ! albertel  136:      pop @stack; 
1.3       sakharuk  137:      pop @parstack;
1.5       albertel  138:    }
1.3       sakharuk  139:  }
                    140:  return $finaloutput;
1.7       albertel  141: }
                    142: 
                    143: sub callsub {
                    144:   my ($sub,$target,$token,@parstack)=@_;
                    145:   my $currentstring='';
                    146:   {
                    147:     no strict 'refs';
                    148:     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
                    149:       #print "Calling sub $sub in $space \n";
                    150:       $sub="$space\:\:$sub";
                    151:       $currentstring = &$sub($target,$token,\@parstack);
                    152:     } else {
                    153:       #print "NOT Calling sub $sub\n";
                    154:       if (defined($token->[4])) {
                    155: 	$currentstring = $token->[4];
                    156:       } else {
                    157: 	$currentstring = $token->[2];
                    158:       }
                    159:     }
                    160:     use strict 'refs';
                    161:   }
                    162:   return $currentstring;
1.1       sakharuk  163: }
                    164: 
1.8       albertel  165: sub parstring {
                    166:   my ($token) = @_;
                    167:   my $temp='';
                    168:   map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
                    169:   return $temp;
                    170: }
1.1       sakharuk  171: 1;
                    172: __END__