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)=@_;
  57     if($self->state() == $STATE_FILE)
  58     {
  59         return $self->{db}->filename(@{$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         @dents=("NOT", $self->{db}->tags(@{$self->{elements}}));
  89     }
  90     elsif($state==$STATE_ROOT)
  91     {
  92         @dents=(qw(ALL NOT), $self->{db}->tags(@{$self->{elements}}));
  93     }
  94     elsif($state==$STATE_ALBUMS)
  95     {
  96         @dents=(qw(TRACKS NOALBUM),$self->{db}->albums(@{$self->{elements}}));
  97     }
  98     elsif($state==$STATE_TRACKLIST)
  99     {
 100         @dents=$self->{db}->tracks(@{$self->{elements}});
 101     }
 102     else
 103     {
 104         print "DIRENTS: UNHANDLED STATE: $state\n";
 105     }
 106     return(@dents);
 107 }
 108
 109 sub parse
 110 {
 111     my($self)=@_;
 112     @{$self->{components}}=split(/\//, $self->{path});
 113     shift @{$self->{components}}; # drop empty field before leading /
 114 #    print "PATH: $self->{path}\n";
 115     $self->state($STATE_ROOT);
 116     return if($self->{path} eq "/");
 117     my @parts=@{$self->{components}};
 118     my($tag, $tagval);
 119     $self->{elements}=[];
 120     while(my $name=shift @parts)
 121     {
 122 #       print "NAME: $name\n";
 123         my $state=$self->state();
 124         if($state==$STATE_INVALID)
 125         {
 126 #           print "SM: INVALID: $name\n";
 127             return;
 128         }
 129         elsif($state==$STATE_ROOT)
 130         {
 131 #           print "SM: ROOT: $name\n";
 132             if($name eq "ALL")
 133             {
 134                 $self->state($STATE_TAG);
 135             }
 136             elsif($name eq "NOT")
 137             {
 138                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($name));
 139                 $self->state($STATE_BOOLEAN);
 140             }
 141             else
 142             {
 143                 $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 144                 if($tag)
 145                 {
 146                     push(@{$self->{elements}}, $tag);
 147                     $self->state($STATE_TAG);
 148                 }
 149                 else
 150                 {
 151                     $self->state($STATE_INVALID);
 152                 }
 153             }
 154         }
 155         elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
 156         {
 157 #           print "SM: TAG/TAGVAL($state): $name\n";
 158             my $tag=$self->{elements}->[$#{$self->{elements}}];
 159             if($state==$STATE_TAG &&
 160                defined($tag) &&
 161                ref($tag) eq "ID3FS::PathElement::Tag" &&
 162                $self->{db}->tag_has_values($tag->{id}))
 163             {
 164                 my $tagval=ID3FS::PathElement::Tagval->new($name);
 165                 if(defined($tagval))
 166                 {
 167                     $self->state($STATE_TAGVAL);
 168                     # stay in tag state
 169                     push(@{$self->{elements}}, $tagval);
 170                 }
 171                 else
 172                 {
 173                     $self->state($STATE_INVALID);
 174                 }
 175             }
 176             elsif($name eq "TRACKS")
 177             {
 178                 $self->state($STATE_TRACKLIST);
 179             }
 180             elsif($name eq "NOARTIST")
 181             {
 182                 $self->state($STATE_TRACKLIST);
 183             }
 184             elsif($name eq "AND")
 185             {
 186                 $self->state($STATE_BOOLEAN);
 187                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($name));
 188             }
 189             elsif($name eq "OR")
 190             {
 191                 $self->state($STATE_BOOLEAN);
 192                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($name));
 193             }
 194             else
 195             {
 196                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 197                 if($artist)
 198                 {
 199                     push(@{$self->{elements}}, $artist);
 200                     $self->state($STATE_ALBUMS);
 201                 }
 202                 else
 203                 {
 204                     $self->state($STATE_INVALID);
 205                 }
 206             }
 207         }
 208         elsif($state==$STATE_BOOLEAN)
 209         {
 210 #           print "SM: BOOLEAN: $name\n";
 211             if($name eq "NOT")
 212             {
 213                 $self->state($STATE_BOOLEAN);
 214             }
 215             else
 216             {
 217                 my $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 218                 if($tag)
 219                 {
 220                     push(@{$self->{elements}}, $tag);
 221                     $self->state($STATE_TAG);
 222                 }
 223                 else
 224                 {
 225                     $self->state($STATE_INVALID);
 226                 }
 227             }
 228         }
 229         elsif($state==$STATE_ALBUMS)
 230         {
 231 #           print "SM: ALBUM: $name\n";
 232             if($name eq "TRACKS")
 233             {
 234                 $self->state($STATE_TRACKLIST);
 235             }
 236             elsif($name eq "NOALBUM")
 237             {
 238                 $self->state($STATE_TRACKLIST);
 239             }
 240             else
 241             {
 242                 my $album=ID3FS::PathElement::Album->new($self->{db}, $name);
 243                 if($album)
 244                 {
 245                     push(@{$self->{elements}}, $album);
 246                     $self->state($STATE_TRACKLIST);
 247                 }
 248                 else
 249                 {
 250                     $self->state($STATE_INVALID);
 251                 }
 252             }
 253         }
 254         elsif($state==$STATE_TRACKLIST)
 255         {
 256 #           print "SM: TRACKLIST: $name\n";
 257             my $track=ID3FS::PathElement::File->new($self->{db}, $name);
 258             push(@{$self->{elements}}, $track);
 259             if($track)
 260             {
 261                 push(@{$self->{elements}}, $track);
 262                 $self->state($STATE_FILE);
 263             }
 264             else
 265             {
 266                 $self->state($STATE_INVALID);
 267             }
 268         }
 269         elsif($state==$STATE_FILE)
 270         {
 271 #           print "SM: FILE: $name\n";
 272             # Can't have anything after a filename
 273             $self->state($STATE_INVALID);
 274         }
 275         else
 276         {
 277             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 278             $self->state($STATE_INVALID);
 279         }
 280     }
 281 }
 282
 283 sub state
 284 {
 285     my($self, $newstate)=@_;
 286     $self->{state}=$newstate if(defined($newstate));
 287     return $self->{state};
 288 }
 289
 290 1;