Return to lonxml.pm CVS log

Up to [LON-CAPA] / loncom / xml

- moved $external::target to always be defined
- fixed scripttag to allow it be able to report results from scripts
- fixed caparesponse to not print out anything

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