Annotation of loncom/xml/lonxml.pm, revision 1.22

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;
1.13      albertel   11: use Opcode;
1.7       albertel   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}=$space;
                     20:   }
                     21: }
1.11      sakharuk   22:                                      
1.4       albertel   23: use Apache::style;
1.3       sakharuk   24: use Apache::lontexconvert;
1.7       albertel   25: use Apache::run;
1.4       albertel   26: use Apache::londefdef;
1.7       albertel   27: use Apache::scripttag;
1.3       sakharuk   28: #==================================================   Main subroutine: xmlparse  
                     29: 
                     30: sub xmlparse {
                     31: 
1.18      albertel   32:  my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
1.16      albertel   33:  my @pars = ();
                     34:  push (@pars,HTML::TokeParser->new(\$content_file_string));
1.3       sakharuk   35:  my $currentstring = '';
                     36:  my $finaloutput = ''; 
                     37:  my $newarg = '';
1.16      albertel   38:  my $result;
1.3       sakharuk   39:  my $safeeval = new Safe;
1.6       albertel   40:  $safeeval->permit("entereval");
1.13      albertel   41:  $safeeval->permit(":base_math");
1.19      albertel   42:  $safeeval->deny(":base_io");
                     43: #need to inspect this class of ops
                     44: # $safeeval->deny(":base_orig");
1.21      albertel   45:  $safeinit .= ';$external::target='.$target.';';
                     46:  &Apache::run::run($safeinit,$safeeval);
1.3       sakharuk   47: #-------------------- Redefinition of the target in the case of compound target
                     48: 
                     49:  ($target, my @tenta) = split('&&',$target);
                     50: 
                     51:  my @stack = (); 
                     52:  my @parstack = ();
1.17      albertel   53:  &initdepth;
1.3       sakharuk   54:  my $token;
1.16      albertel   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));
1.19      albertel   65:        &increasedepth($token);       
1.16      albertel   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 {
1.17      albertel   71: 	 $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.16      albertel   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] 
1.19      albertel   77: 	      && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
1.16      albertel   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 {
1.17      albertel   84: 	 $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.16      albertel   85: 			       \@pars,$safeeval, \%style_for_target);
1.13      albertel   86:        }
1.16      albertel   87:      }
                     88:      if ($result ne "" ) {
                     89:        if ( $#parstack > -1 ) { 
1.13      albertel   90: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,
                     91: 						$parstack[$#parstack]);
1.16      albertel   92:        } else {
                     93: 	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13      albertel   94:        }
1.16      albertel   95:        $result = '';
1.2       sakharuk   96:      }
1.19      albertel   97:      if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
1.5       albertel   98:    }
1.16      albertel   99:    pop @pars;
1.3       sakharuk  100:  }
                    101:  return $finaloutput;
1.15      albertel  102: }
                    103: 
                    104: sub recurse {
                    105:   
                    106:   my @innerstack = (); 
                    107:   my @innerparstack = ();
                    108:   my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16      albertel  109:   my @pat = ();
                    110:   push (@pat,HTML::TokeParser->new(\$newarg));
1.15      albertel  111:   my $tokenpat;
                    112:   my $partstring = '';
                    113:   my $output='';
1.16      albertel  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));
1.19      albertel  122: 	&increasedepth($tokenpat);
1.16      albertel  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] 
1.17      albertel  129: 	       && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
1.19      albertel  130: 					&decreasedepth($tokenpat);}
1.16      albertel  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: 	$partstring = '';
                    153:       }
1.17      albertel  154:       if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
1.19      albertel  155: 				 &decreasedepth($tokenpat);}
1.15      albertel  156:     }
1.16      albertel  157:     pop @pat;
1.15      albertel  158:   }
                    159:   return $output;
1.7       albertel  160: }
                    161: 
                    162: sub callsub {
1.14      albertel  163:   my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7       albertel  164:   my $currentstring='';
                    165:   {
                    166:     no strict 'refs';
                    167:     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
1.22    ! albertel  168:       &Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
1.7       albertel  169:       $sub="$space\:\:$sub";
1.17      albertel  170:       $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.16      albertel  171:       $currentstring = &$sub($target,$token,$parstack,$parser,
                    172: 			     $safeeval,$style);
1.7       albertel  173:     } else {
1.22    ! albertel  174:       &Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
1.7       albertel  175:       if (defined($token->[4])) {
                    176: 	$currentstring = $token->[4];
                    177:       } else {
                    178: 	$currentstring = $token->[2];
                    179:       }
                    180:     }
                    181:     use strict 'refs';
                    182:   }
                    183:   return $currentstring;
1.17      albertel  184: }
                    185: 
                    186: sub initdepth {
                    187:   @Apache::lonxml::depthcounter=();
                    188:   $Apache::lonxml::depth=-1;
                    189:   $Apache::lonxml::olddepth=-1;
                    190: }
                    191: 
                    192: sub increasedepth {
1.19      albertel  193:   my ($token) = @_;
1.17      albertel  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++;
1.19      albertel  199: #  print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
1.17      albertel  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 {
1.19      albertel  207:   my ($token) = @_;
1.17      albertel  208:   $Apache::lonxml::depth--;
1.19      albertel  209: #  print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
1.1       sakharuk  210: }
1.19      albertel  211: 
                    212: sub get_all_text {
                    213: 
                    214:  my($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 $result
                    231: }
                    232: 
1.1       sakharuk  233: 
1.8       albertel  234: sub parstring {
                    235:   my ($token) = @_;
                    236:   my $temp='';
1.20      albertel  237:   map {
                    238:     if ($_=~/\w+/) {
                    239:       $temp .= "my \$$_=\"$token->[2]->{$_}\";"
                    240:     }
                    241:   } @{$token->[3]};
1.8       albertel  242:   return $temp;
                    243: }
1.22    ! albertel  244: 
        !           245: $Apache::lonxml::debug=0;
        !           246: sub debug {
        !           247:   if ($Apache::lonxml::debug eq 1) {
        !           248:     print "DEBUG:".$_[0]."<br>\n";
        !           249:   }
        !           250: }
        !           251: sub error {
        !           252:   if ($Apache::lonxml::debug eq 1) {
        !           253:     print "ERROR:".$_[0]."<br>\n";
        !           254:   }
        !           255: }
        !           256: sub warning {
        !           257:   if ($Apache::lonxml::debug eq 1) {
        !           258:     print "WARNING:".$_[0]."<br>\n";
        !           259:   }
        !           260: }
        !           261: 
1.1       sakharuk  262: 1;
                    263: __END__
1.11      sakharuk  264: 
                    265: 
                    266: 
                    267: 
                    268: 

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