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- created &newparser routine to be used when adding a parser to the stack
  it also updates:
- new global @Apache::lonxml::pwd which maintains the directory each parser was   started in.

    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}=$space;
   20:   }
   21: }
   22:                                      
   23: use Apache::style;
   24: use Apache::lontexconvert;
   25: use Apache::run;
   26: use Apache::londefdef;
   27: use Apache::scripttag;
   28: #==================================================   Main subroutine: xmlparse  
   29: @Apache::lonxml::pwd=();
   30: sub xmlparse {
   31: 
   32:  my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
   33:  my @pars = ();
   34:  @Apache::lonxml::pwd=();
   35:  my $pwd=$ENV{'request.filename'};
   36:  $pwd =~ s:/[^/]*$::;
   37:  &newparser(\@pars,\$content_file_string,$pwd);
   38:  my $currentstring = '';
   39:  my $finaloutput = ''; 
   40:  my $newarg = '';
   41:  my $result;
   42:  my $safeeval = new Safe;
   43:  $safeeval->permit("entereval");
   44:  $safeeval->permit(":base_math");
   45:  $safeeval->deny(":base_io");
   46: #need to inspect this class of ops
   47: # $safeeval->deny(":base_orig");
   48:  $safeinit .= ';$external::target='.$target.';';
   49:  &Apache::run::run($safeinit,$safeeval);
   50: #-------------------- Redefinition of the target in the case of compound target
   51: 
   52:  ($target, my @tenta) = split('&&',$target);
   53: 
   54:  my @stack = (); 
   55:  my @parstack = ();
   56:  &initdepth;
   57:  my $token;
   58:  while ( $#pars > -1 ) {
   59:    while ($token = $pars[$#pars]->get_token) {
   60:      if ($token->[0] eq 'T') {
   61:        $result=$token->[1];
   62: #       $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
   63:      } elsif ($token->[0] eq 'S') {
   64:        # add tag to stack 	    
   65:        push (@stack,$token->[1]);
   66:        # add parameters list to another stack
   67:        push (@parstack,&parstring($token));
   68:        &increasedepth($token);       
   69:        if (exists $style_for_target{$token->[1]}) {
   70: 	 $finaloutput .= &recurse($style_for_target{$token->[1]},
   71: 				  $target,$safeeval,\%style_for_target,
   72: 				  @parstack);
   73:        } else {
   74: 	 $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
   75: 			       \@pars, $safeeval, \%style_for_target);
   76:        }              
   77:      } elsif ($token->[0] eq 'E')  {
   78:        #clear out any tags that didn't end
   79:        while ($token->[1] ne $stack[$#stack] 
   80: 	      && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
   81:        
   82:        if (exists $style_for_target{'/'."$token->[1]"}) {
   83: 	 $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
   84: 				  $target,$safeeval,\%style_for_target,
   85: 				  @parstack);
   86:        } else {
   87: 	 $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
   88: 			       \@pars,$safeeval, \%style_for_target);
   89:        }
   90:      }
   91:      if ($result ne "" ) {
   92:        if ( $#parstack > -1 ) { 
   93: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,
   94: 						$parstack[$#parstack]);
   95:        } else {
   96: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
   97:        }
   98:        $result = '';
   99:      }
  100:      if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
  101:    }
  102:    pop @pars;
  103:    pop @Apache::lonxml::pwd;
  104:  }
  105:  return $finaloutput;
  106: }
  107: 
  108: sub recurse {
  109:   
  110:   my @innerstack = (); 
  111:   my @innerparstack = ();
  112:   my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
  113:   my @pat = ();
  114:   &newparser(\@pat,\$newarg);
  115:   my $tokenpat;
  116:   my $partstring = '';
  117:   my $output='';
  118:   my $decls='';
  119:   while ( $#pat > -1 ) {
  120:     while  ($tokenpat = $pat[$#pat]->get_token) {
  121:       if ($tokenpat->[0] eq 'T') {
  122: 	$partstring = $tokenpat->[1];
  123:       } elsif ($tokenpat->[0] eq 'S') {
  124: 	push (@innerstack,$tokenpat->[1]);
  125: 	push (@innerparstack,&parstring($tokenpat));
  126: 	&increasedepth($tokenpat);
  127: 	$partstring = &callsub("start_$tokenpat->[1]", 
  128: 			       $target, $tokenpat, \@innerparstack,
  129: 			       \@pat, $safeeval, $style_for_target);
  130:       } elsif ($tokenpat->[0] eq 'E') {
  131: 	#clear out any tags that didn't end
  132: 	while ($tokenpat->[1] ne $innerstack[$#innerstack] 
  133: 	       && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
  134: 					&decreasedepth($tokenpat);}
  135: 	$partstring = &callsub("end_$tokenpat->[1]",
  136: 			       $target, $tokenpat, \@innerparstack,
  137: 			       \@pat, $safeeval, $style_for_target);
  138:       }
  139:       #pass both the variable to the style tag, and the tag we 
  140:       #are processing inside the <definedtag>
  141:       if ( $partstring ne "" ) {
  142: 	if ( $#parstack > -1 ) { 
  143: 	  if ( $#innerparstack > -1 ) { 
  144: 	    $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
  145: 	  } else {
  146: 	    $decls= $parstack[$#parstack];
  147: 	  }
  148: 	} else {
  149: 	  if ( $#innerparstack > -1 ) { 
  150: 	    $decls=$innerparstack[$#innerparstack];
  151: 	  } else {
  152: 	    $decls='';
  153: 	  }
  154: 	}
  155: 	$output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
  156: 	$partstring = '';
  157:       }
  158:       if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
  159: 				 &decreasedepth($tokenpat);}
  160:     }
  161:     pop @pat;
  162:     pop @Apache::lonxml::pwd;
  163:   }
  164:   return $output;
  165: }
  166: 
  167: sub callsub {
  168:   my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
  169:   my $currentstring='';
  170:   {
  171:     no strict 'refs';
  172:     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
  173:       #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
  174:       $sub="$space\:\:$sub";
  175:       $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
  176:       $currentstring = &$sub($target,$token,$parstack,$parser,
  177: 			     $safeeval,$style);
  178:     } else {
  179:       #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
  180:       if (defined($token->[4])) {
  181: 	$currentstring = $token->[4];
  182:       } else {
  183: 	$currentstring = $token->[2];
  184:       }
  185:     }
  186:     use strict 'refs';
  187:   }
  188:   return $currentstring;
  189: }
  190: 
  191: sub initdepth {
  192:   @Apache::lonxml::depthcounter=();
  193:   $Apache::lonxml::depth=-1;
  194:   $Apache::lonxml::olddepth=-1;
  195: }
  196: 
  197: sub increasedepth {
  198:   my ($token) = @_;
  199:   if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
  200:     $#Apache::lonxml::depthcounter--;
  201:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  202:   }
  203:   $Apache::lonxml::depth++;
  204: #  print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
  205:   $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
  206:   if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
  207:     $Apache::lonxml::olddepth=$Apache::lonxml::depth;
  208:   }
  209: }
  210: 
  211: sub decreasedepth {
  212:   my ($token) = @_;
  213:   $Apache::lonxml::depth--;
  214: #  print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
  215: }
  216: 
  217: sub get_all_text {
  218: 
  219:  my($tag,$pars)= @_;
  220:  my $depth=0;
  221:  my $token;
  222:  my $result='';
  223:  while (($depth >=0) && ($token = $pars->get_token)) {
  224:    if ($token->[0] eq 'T') {
  225:      $result.=$token->[1];
  226:    } elsif ($token->[0] eq 'S') {
  227:      if ($token->[1] eq $tag) { $depth++; }
  228:      $result.=$token->[4];
  229:    } elsif ($token->[0] eq 'E')  {
  230:      if ($token->[1] eq $tag) { $depth--; }
  231:      #skip sending back the last end tag
  232:      if ($depth > -1) { $result.=$token->[2]; }
  233:    }
  234:  }
  235:  return $result
  236: }
  237: 
  238: sub newparser {
  239:   my ($parser,$contentref,$dir) = @_;
  240:   push (@$parser,HTML::TokeParser->new($contentref));
  241:   if ( $dir eq '' ) {
  242:     push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
  243:   } else {
  244:     push (@Apache::lonxml::pwd, $dir);
  245:   } 
  246: #  &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
  247: #  &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
  248: }
  249: 
  250: sub parstring {
  251:   my ($token) = @_;
  252:   my $temp='';
  253:   map {
  254:     if ($_=~/\w+/) {
  255:       $temp .= "my \$$_=\"$token->[2]->{$_}\";"
  256:     }
  257:   } @{$token->[3]};
  258:   return $temp;
  259: }
  260: 
  261: $Apache::lonxml::debug=0;
  262: sub debug {
  263:   if ($Apache::lonxml::debug eq 1) {
  264:     print "DEBUG:".$_[0]."<br>\n";
  265:   }
  266: }
  267: sub error {
  268:   print "ERROR:".$_[0]."<br>\n";
  269: }
  270: sub warning {
  271:   if ($Apache::lonxml::debug eq 1) {
  272:     print "WARNING:".$_[0]."<br>\n";
  273:   }
  274: }
  275: 
  276: 1;
  277: __END__
  278: 
  279: 
  280: 
  281: 
  282: