lib/ID3FS/Path.pm

   1 package ID3FS::Path;
   2
   3 use strict;
   4 use warnings;
   5 use ID3FS::PathElement::Artist;
   6 use ID3FS::PathElement::Album;
   7 use ID3FS::PathElement::Boolean;
   8 use ID3FS::PathElement::File;
   9 use ID3FS::PathElement::Tag;
  10 use ID3FS::PathElement::Tagval;
  11
  12 our ($STATE_INVALID, $STATE_ROOT, $STATE_TAG, $STATE_TAGVAL,
  13      $STATE_BOOLEAN, $STATE_ALBUMS, $STATE_TRACKLIST,
  14      $STATE_FILE)=(0..7);
  15
  16 sub new
  17 {
  18     my $proto=shift;
  19     my $class=ref($proto) || $proto;
  20     my $self={};
  21     bless($self,$class);
  22
  23     $self->{db}=shift;
  24     $self->{path}=shift;
  25     $self->parse();
  26 #    print "STATE: ", $self->state(), "\n";
  27     return $self;
  28 }
  29
  30 sub isdir
  31 {
  32     my($self)=@_;
  33     if(($self->state() == $STATE_FILE) ||
  34        ($self->state() == $STATE_INVALID))
  35     {
  36         return 0;
  37     }
  38     return 1;
  39 }
  40
  41 sub isfile
  42 {
  43     my($self)=@_;
  44     return 1 if($self->state() == $STATE_FILE);
  45     return 0;
  46 }
  47
  48 sub isvalid
  49 {
  50     my($self)=@_;
  51     return($self->state() != $STATE_INVALID);
  52 }
  53
  54 sub dest
  55 {
  56     my($self, $mountpoint)=@_;
  57     if($self->state() == $STATE_FILE)
  58     {
  59         return $self->{db}->filename($mountpoint, @{$self->{elements}});
  60     }
  61     return "ERROR"; #should never happen?
  62 }
  63
  64 sub dirents
  65 {
  66     my($self)=@_;
  67     my @dents=();
  68     my $state=$self->state();
  69 #    print "DIRENTS: STATE: $state\n";
  70     if($state==$STATE_TAG || $state==$STATE_TAGVAL)
  71     {
  72         my $tag=$self->{elements}->[$#{$self->{elements}}];
  73         if($state==$STATE_TAG &&
  74            defined($tag) &&
  75            ref($tag) eq "ID3FS::PathElement::Tag" &&
  76            $self->{db}->tag_has_values($tag->{id}))
  77         {
  78             @dents=$self->{db}->tag_values($tag->{id});
  79         }
  80         else
  81         {
  82             @dents=(qw(AND OR TRACKS NOARTIST),
  83                     $self->{db}->artists(@{$self->{elements}}));
  84         }
  85     }
  86     elsif($state==$STATE_BOOLEAN)
  87     {
  88         my $parent=$self->{elements}->[$#{$self->{elements}}];
  89         unless(defined($parent) &&
  90                ref($parent) eq "ID3FS::PathElement::Boolean" &&
  91                $parent->{name} eq "NOT")
  92         {
  93             push(@dents, "NOT");
  94         }
  95         push(@dents, $self->{db}->tags(@{$self->{elements}}));
  96     }
  97     elsif($state==$STATE_ROOT)
  98     {
  99         @dents=(qw(ALL NOT), $self->{db}->tags(@{$self->{elements}}));
 100     }
 101     elsif($state==$STATE_ALBUMS)
 102     {
 103         @dents=(qw(TRACKS NOALBUM),$self->{db}->albums(@{$self->{elements}}));
 104     }
 105     elsif($state==$STATE_TRACKLIST)
 106     {
 107         @dents=$self->{db}->tracks(@{$self->{elements}});
 108     }
 109     else
 110     {
 111         print "DIRENTS: UNHANDLED STATE: $state\n";
 112     }
 113     return(@dents);
 114 }
 115
 116 sub parse
 117 {
 118     my($self)=@_;
 119     @{$self->{components}}=split(/\//, $self->{path});
 120     shift @{$self->{components}}; # drop empty field before leading /
 121 #    print "PATH: $self->{path}\n";
 122     $self->state($STATE_ROOT);
 123     return if($self->{path} eq "/");
 124     my @parts=@{$self->{components}};
 125     my($tag, $tagval);
 126     $self->{elements}=[];
 127     while(my $name=shift @parts)
 128     {
 129 #       print "NAME: $name\n";
 130         my $state=$self->state();
 131         if($state==$STATE_INVALID)
 132         {
 133 #           print "SM: INVALID: $name\n";
 134             return;
 135         }
 136         elsif($state==$STATE_ROOT)
 137         {
 138 #           print "SM: ROOT: $name\n";
 139             if($name eq "ALL")
 140             {
 141                 $self->state($STATE_TAG);
 142             }
 143             elsif($name eq "NOT")
 144             {
 145                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 146                 $self->state($STATE_BOOLEAN);
 147             }
 148             else
 149             {
 150                 $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 151                 if($tag)
 152                 {
 153                     push(@{$self->{elements}}, $tag);
 154                     $self->state($STATE_TAG);
 155                 }
 156                 else
 157                 {
 158                     $self->state($STATE_INVALID);
 159                 }
 160             }
 161         }
 162         elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
 163         {
 164 #           print "SM: TAG/TAGVAL($state): $name\n";
 165             my $tag=$self->{elements}->[$#{$self->{elements}}];
 166             if($state==$STATE_TAG &&
 167                defined($tag) &&
 168                ref($tag) eq "ID3FS::PathElement::Tag" &&
 169                $self->{db}->tag_has_values($tag->{id}))
 170             {
 171                 my $tagval=ID3FS::PathElement::Tag->new($self->{db}, $name, $tag->{id});
 172                 if(defined($tagval))
 173                 {
 174                     $self->state($STATE_TAGVAL);
 175                     # stay in tag state
 176                     push(@{$self->{elements}}, $tagval);
 177                 }
 178                 else
 179                 {
 180                     $self->state($STATE_INVALID);
 181                 }
 182             }
 183             elsif($name eq "TRACKS")
 184             {
 185                 $self->state($STATE_TRACKLIST);
 186             }
 187             elsif($name eq "NOARTIST")
 188             {
 189                 $self->state($STATE_TRACKLIST);
 190             }
 191             elsif($name eq "AND")
 192             {
 193                 $self->state($STATE_BOOLEAN);
 194                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 195             }
 196             elsif($name eq "OR")
 197             {
 198                 $self->state($STATE_BOOLEAN);
 199                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 200             }
 201             else
 202             {
 203                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 204                 if($artist)
 205                 {
 206                     push(@{$self->{elements}}, $artist);
 207                     $self->state($STATE_ALBUMS);
 208                 }
 209                 else
 210                 {
 211                     $self->state($STATE_INVALID);
 212                 }
 213             }
 214         }
 215         elsif($state==$STATE_BOOLEAN)
 216         {
 217 #           print "SM: BOOLEAN: $name\n";
 218             my $parent=$self->{elements}->[$#{$self->{elements}}];
 219             my $allownot=1;
 220             if(defined($parent) &&
 221                ref($parent) eq "ID3FS::PathElement::Boolean" &&
 222                $parent->{name} eq "NOT")
 223             {
 224                 $allownot=0;
 225             }
 226             if($allownot && $name eq "NOT")
 227             {
 228                 $self->state($STATE_BOOLEAN);
 229                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 230             }
 231             else
 232             {
 233                 my $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 234                 if($tag)
 235                 {
 236                     push(@{$self->{elements}}, $tag);
 237                     $self->state($STATE_TAG);
 238                 }
 239                 else
 240                 {
 241                     $self->state($STATE_INVALID);
 242                 }
 243             }
 244         }
 245         elsif($state==$STATE_ALBUMS)
 246         {
 247 #           print "SM: ALBUM: $name\n";
 248             if($name eq "TRACKS")
 249             {
 250                 $self->state($STATE_TRACKLIST);
 251             }
 252             elsif($name eq "NOALBUM")
 253             {
 254                 $self->state($STATE_TRACKLIST);
 255             }
 256             else
 257             {
 258                 my $album=ID3FS::PathElement::Album->new($self->{db}, $name);
 259                 if($album)
 260                 {
 261                     push(@{$self->{elements}}, $album);
 262                     $self->state($STATE_TRACKLIST);
 263                 }
 264                 else
 265                 {
 266                     $self->state($STATE_INVALID);
 267                 }
 268             }
 269         }
 270         elsif($state==$STATE_TRACKLIST)
 271         {
 272 #           print "SM: TRACKLIST: $name\n";
 273             my $track=ID3FS::PathElement::File->new($self->{db}, $name);
 274             if($track)
 275             {
 276                 push(@{$self->{elements}}, $track);
 277                 $self->state($STATE_FILE);
 278             }
 279             else
 280             {
 281                 $self->state($STATE_INVALID);
 282             }
 283         }
 284         elsif($state==$STATE_FILE)
 285         {
 286 #           print "SM: FILE: $name\n";
 287             # Can't have anything after a filename
 288             $self->state($STATE_INVALID);
 289         }
 290         else
 291         {
 292             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 293             $self->state($STATE_INVALID);
 294         }
 295     }
 296 }
 297
 298 sub state
 299 {
 300     my($self, $newstate)=@_;
 301     $self->{state}=$newstate if(defined($newstate));
 302     return $self->{state};
 303 }
 304
 305 1;