lib/ID3FS/Path.pm

   1 package ID3FS::Path;
   2
   3 use strict;
   4 use warnings;
   5 use ID3FS::Path::Node;
   6
   7 our ($STATE_INVALID, $STATE_ROOT, $STATE_TAG, $STATE_TAGVAL,
   8      $STATE_BOOLEAN, $STATE_ALBUMS, $STATE_TRACKLIST,
   9      $STATE_FILE, $STATE_ALL)=(0..8);
  10
  11 our %priorities=( "OR" => 0, "AND" => 1, "NOT" => 2 );
  12
  13 our $PATH_ALLTRACKS="TRACKS";
  14 our $PATH_NOARTIST="NOARTIST";
  15 our $PATH_NOALBUM="NOALBUM";
  16
  17 sub new
  18 {
  19     my $proto=shift;
  20     my $class=ref($proto) || $proto;
  21     my $self={};
  22     bless($self,$class);
  23
  24     $self->{elements}=[];
  25     $self->{db}=shift;
  26     $self->{path}=shift;
  27     $self->{verbose}=shift;
  28     $self->{maxtagdepth}=shift;
  29     $self->{curtagdepth}=0;
  30     $self->{path} =~ s/\/\//\//g; # drop doubled slashes
  31
  32     $self->parse();
  33 #    print "STATE: ", $self->state(), "\n";
  34     return $self;
  35 }
  36
  37 sub isdir
  38 {
  39     my($self)=@_;
  40     if(($self->state() == $STATE_FILE) ||
  41        ($self->state() == $STATE_INVALID))
  42     {
  43         return 0;
  44     }
  45     return 1;
  46 }
  47
  48 sub isfile
  49 {
  50     my($self)=@_;
  51     return($self->state() == $STATE_FILE);
  52 }
  53
  54 sub isvalid
  55 {
  56     my($self)=@_;
  57     return($self->state() != $STATE_INVALID);
  58 }
  59
  60 sub dest
  61 {
  62     my($self, $mountpoint)=@_;
  63     if($self->state() == $STATE_FILE)
  64     {
  65         return $self->filename($mountpoint);
  66     }
  67     return "ERROR"; #should never happen?
  68 }
  69
  70 sub dirents
  71 {
  72     my($self)=@_;
  73     my @dents=();
  74     my @fents=();
  75     my $state=$self->state();
  76 #    print "DIRENTS: STATE: $state\n";
  77 #    print "DIRENTS: FILE: $self->{path}\n";
  78     if($state==$STATE_ALL)
  79     {
  80         @dents=($PATH_ALLTRACKS, $PATH_NOARTIST, $self->artists());
  81     }
  82     elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
  83     {
  84         if($state==$STATE_TAG && $self->at("tag") &&
  85            $self->{db}->tag_has_values($self->tail()->id()))
  86         {
  87             @dents=$self->tags();
  88         }
  89         else
  90         {
  91             if($self->{maxtagdepth} && ($self->{curtagdepth} < $self->{maxtagdepth}))
  92             {
  93                 @dents=qw(AND OR);
  94             }
  95             push(@dents, $self->filter($PATH_ALLTRACKS, $PATH_NOARTIST));
  96             push(@dents, $self->artists());
  97         }
  98     }
  99     elsif($state==$STATE_BOOLEAN)
 100     {
 101         my $parent=$self->tail();
 102         unless($self->is("boolean", $parent) &&
 103                $parent->{name} eq "NOT")
 104         {
 105             @dents=("NOT");
 106         }
 107         push(@dents,$self->tags());
 108     }
 109     elsif($state==$STATE_ROOT)
 110     {
 111         @dents=(qw(ALL NOT), $self->tags());
 112     }
 113     elsif($state==$STATE_ALBUMS)
 114     {
 115         @dents=($self->filter($PATH_ALLTRACKS, $PATH_NOALBUM), $self->albums());
 116     }
 117     elsif($state==$STATE_TRACKLIST)
 118     {
 119         @fents=$self->tracks();
 120     }
 121     else
 122     {
 123         print "DIRENTS: UNHANDLED STATE: $state\n";
 124     }
 125     return(\@dents, \@fents);
 126 }
 127
 128 sub parse
 129 {
 130     my($self)=@_;
 131     @{$self->{components}}=split(/\//, $self->{path});
 132     shift @{$self->{components}}; # drop empty field before leading /
 133 #    print "PATH: $self->{path}\n";
 134     $self->state($STATE_ROOT);
 135     return if($self->{path} eq "/");
 136     my @parts=@{$self->{components}};
 137     my($tag, $tagval);
 138     $self->{elements}=[];
 139     $self->{bare_not}=0;
 140     $self->{in_all}=0;
 141     my $root_not=0;
 142     my $tags_seen=0;
 143     while(defined(my $name=shift @parts))
 144     {
 145 #       print "NAME: $name\n";
 146         my $state=$self->state();
 147         if($state==$STATE_INVALID)
 148         {
 149 #           print "SM: INVALID: $name\n";
 150             return;
 151         }
 152         elsif($state==$STATE_ROOT)
 153         {
 154 #           print "SM: ROOT: $name\n";
 155             if($name eq "ALL")
 156             {
 157                 $self->{in_all}=1;
 158                 $self->state($STATE_ALL);
 159             }
 160             elsif($name eq "NOT")
 161             {
 162                 $root_not=1;
 163                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, "boolean", $name));
 164                 $self->state($STATE_BOOLEAN);
 165             }
 166             else
 167             {
 168                 $tag=ID3FS::Path::Node->new($self->{db},"tag", $name);
 169                 if($tag)
 170                 {
 171                     push(@{$self->{elements}}, $tag);
 172                     $tags_seen++;
 173                     $self->state($STATE_TAG);
 174                 }
 175                 else
 176                 {
 177                     $self->state($STATE_INVALID);
 178                 }
 179             }
 180         }
 181         elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
 182         {
 183             my $tag=$self->tail();
 184 #           print "SM: TAG/TAGVAL($state): $name\n";
 185             if($state==$STATE_TAG && $self->is("tag", $tag) &&
 186                $self->{db}->tag_has_values($tag->id()))
 187             {
 188 #               print "Parsing: parent: $tag->id()\n";
 189                 my $tagval=ID3FS::Path::Node->new($self->{db}, "tag", $name, $tag->id());
 190                 if(defined($tagval))
 191                 {
 192                     $self->state($STATE_TAGVAL);
 193                     # stay in tag state
 194                     push(@{$self->{elements}}, $tagval);
 195                 }
 196                 else
 197                 {
 198                     $self->state($STATE_INVALID);
 199                 }
 200             }
 201             elsif($name eq $PATH_ALLTRACKS)
 202             {
 203                 $self->state($STATE_TRACKLIST);
 204             }
 205             elsif($name eq $PATH_NOARTIST)
 206             {
 207                 $self->state($STATE_TRACKLIST);
 208             }
 209             elsif($name eq "AND")
 210             {
 211                 $self->state($STATE_BOOLEAN);
 212                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, "boolean", $name));
 213             }
 214             elsif($name eq "OR")
 215             {
 216                 $self->state($STATE_BOOLEAN);
 217                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, "boolean", $name));
 218             }
 219             else
 220             {
 221                 my $artist=ID3FS::Path::Node->new($self->{db}, "artist", $name);
 222                 if($artist)
 223                 {
 224                     push(@{$self->{elements}}, $artist);
 225                     $self->state($STATE_ALBUMS);
 226                 }
 227                 else
 228                 {
 229                     $self->state($STATE_INVALID);
 230                 }
 231             }
 232         }
 233         elsif($state==$STATE_BOOLEAN)
 234         {
 235 #           print "SM: BOOLEAN: $name\n";
 236             my $parent=$self->tail();
 237             my $allownot=1;
 238             if($self->is("boolean", $parent) &&
 239                $parent->{name} eq "NOT")
 240             {
 241                 $allownot=0;
 242             }
 243             if($allownot && $name eq "NOT")
 244             {
 245                 $self->state($STATE_BOOLEAN);
 246                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, "boolean", $name));
 247             }
 248             else
 249             {
 250                 my $tag=ID3FS::Path::Node->new($self->{db}, "tag", $name);
 251                 if($tag)
 252                 {
 253                     push(@{$self->{elements}}, $tag);
 254                     $tags_seen++;
 255                     $self->state($STATE_TAG);
 256                 }
 257                 else
 258                 {
 259                     $self->state($STATE_INVALID);
 260                 }
 261             }
 262         }
 263         elsif($state==$STATE_ALBUMS)
 264         {
 265 #           print "SM: ALBUM: $name\n";
 266             if($name eq $PATH_ALLTRACKS)
 267             {
 268                 $self->state($STATE_TRACKLIST);
 269             }
 270             elsif($name eq $PATH_NOALBUM)
 271             {
 272                 $self->state($STATE_TRACKLIST);
 273             }
 274             else
 275             {
 276                 my $album=ID3FS::Path::Node->new($self->{db}, "album", $name);
 277                 if($album)
 278                 {
 279                     push(@{$self->{elements}}, $album);
 280                     $self->state($STATE_TRACKLIST);
 281                 }
 282                 else
 283                 {
 284                     $self->state($STATE_INVALID);
 285                 }
 286             }
 287         }
 288         elsif($state==$STATE_TRACKLIST)
 289         {
 290 #           print "SM: TRACKLIST: $name\n";
 291             my $track=ID3FS::Path::Node->new($self->{db}, "file", $name);
 292             if($track)
 293             {
 294                 push(@{$self->{elements}}, $track);
 295                 $self->state($STATE_FILE);
 296             }
 297             else
 298             {
 299                 $self->state($STATE_INVALID);
 300             }
 301         }
 302         elsif($state==$STATE_FILE)
 303         {
 304 #           print "SM: FILE: $name\n";
 305             # Can't have anything after a filename
 306             $self->state($STATE_INVALID);
 307         }
 308         elsif($state==$STATE_ALL)
 309         {
 310             if($name eq $PATH_ALLTRACKS)
 311             {
 312                 $self->state($STATE_TRACKLIST);
 313             }
 314             elsif($name eq $PATH_NOARTIST)
 315             {
 316                 $self->state($STATE_TRACKLIST);
 317             }
 318             else
 319             {
 320                 my $artist=ID3FS::Path::Node->new($self->{db}, "artist", $name);
 321                 if($artist)
 322                 {
 323                     push(@{$self->{elements}}, $artist);
 324                     $self->state($STATE_ALBUMS);
 325                 }
 326                 else
 327                 {
 328                     $self->state($STATE_INVALID);
 329                 }
 330             }
 331         }
 332         else
 333         {
 334             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 335             $self->state($STATE_INVALID);
 336         }
 337     }
 338
 339     if($root_not && ($tags_seen < 2))
 340     {
 341         $self->{bare_not}=1;
 342     }
 343
 344     # remove trailing boolean
 345     my @elements=@{$self->{elements}};
 346     while(@elements && $self->is("boolean", $elements[$#elements]))
 347     {
 348         pop @elements;
 349     }
 350     # sort elements by precedence
 351     @elements=$self->sort_elements(@elements);
 352     $self->{tagtree}=$self->elements_to_tree(\@elements);
 353     if($self->{tagtree})
 354     {
 355 #       my ($conditions, @joins)=$self->{tagtree}->to_sql();
 356 #       print "CONDITIONS(", scalar(@joins), "): ", $conditions, "\n";
 357     }
 358 }
 359
 360 sub state
 361 {
 362     my($self, $newstate)=@_;
 363     if(defined($newstate))
 364     {
 365         $self->{state}=$newstate;
 366         $self->{curtagdepth}++ if($newstate == $STATE_TAG);
 367     }
 368     return $self->{state};
 369 }
 370
 371 sub elements_to_tree
 372 {
 373     my($self, $elements)=@_;
 374     return undef unless(@$elements);
 375     my ($left, $right, $op)=(undef, undef, undef);
 376     my $thing=pop @$elements;
 377     if($self->is("boolean", $thing))
 378     {
 379         $right=$self->elements_to_tree($elements);
 380         if($thing->{name} ne "NOT")
 381         {
 382             $left=$self->elements_to_tree($elements);
 383         }
 384         $thing->left($left);
 385         $thing->right($right);
 386     }
 387     return $thing;
 388 }
 389
 390 # Dijkstra's shunting-yard algorithm
 391 sub sort_elements
 392 {
 393     my ($self, @input)=@_;
 394     my @opstack=();
 395     my @output=();
 396 #    print "INPUT: ", join(', ', map { $_->{name}; } @input), "\n";
 397     while(my $thing = shift @input)
 398     {
 399         if($self->is("tag", $thing))
 400         {
 401             # Handle tag values by dropping parent
 402             if(@input && $self->is("tag", $input[0]))
 403             {
 404                 $thing=shift @input;
 405             }
 406             push(@output, $thing);
 407         }
 408         elsif($self->is("boolean", $thing))
 409         {
 410             # bool
 411             while(@opstack &&
 412                   ($priorities{$thing->{name}} <= $priorities{$opstack[$#opstack]->{name}}))
 413             {
 414                 push(@output, pop(@opstack));
 415             }
 416             push(@opstack, $thing);
 417         }
 418     }
 419     while(@opstack)
 420     {
 421         push(@output, pop(@opstack));
 422     }
 423 #    print "STACK: ", join(', ', map { $_->{name}; } @output), "\n";
 424     return @output;
 425 }
 426
 427 sub used_tags
 428 {
 429     my($self)=@_;
 430     return() unless(defined($self->{tagtree}));
 431     return($self->{tagtree}->used_tags());
 432 }
 433
 434 sub expecting_values
 435 {
 436     my($self)=@_;
 437     my $tail=$self->tail();
 438     if($self->is("tag", $tail))
 439     {
 440         return($self->{db}->tag_has_values($tail->id()));
 441     }
 442 }
 443
 444 sub trailing_tag_id
 445 {
 446     my($self)=@_;
 447     my $tail=$self->tail();
 448     if($self->is("tag", $tail))
 449     {
 450         return($tail->id());
 451     }
 452     return undef;
 453 }
 454
 455 sub trailing_tag_parent
 456 {
 457     my($self)=@_;
 458     my $tail=$self->tail();
 459     if($self->is("tag", $tail))
 460     {
 461         return($tail->{parents_id});
 462     }
 463     return undef;
 464 }
 465
 466 sub tail
 467 {
 468     my($self)=@_;
 469     return($self->{elements}->[$#{$self->{elements}}]);
 470 }
 471
 472 sub at
 473 {
 474     my($self, $type)=@_;
 475     return($self->is($type, $self->tail()));
 476 }
 477
 478 sub is
 479 {
 480     my($self, $type, $thing)=@_;
 481     return 0 unless($thing);
 482     return 0 unless($thing->type());
 483     return 1 if($type eq $thing->type());
 484     return 0;
 485 }
 486
 487 # the one before last
 488 sub tail_parent
 489 {
 490     my($self)=@_;
 491     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 492 }
 493
 494 ######################################################################
 495
 496 sub tags
 497 {
 498     my($self)=@_;
 499     if(!$self->{tagtree}) # / or /NOT
 500     {
 501         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 502         return($self->{db}->cmd_firstcol($sql));
 503     }
 504     my $hasvals=$self->expecting_values();
 505     my $parent=$self->trailing_tag_parent();
 506 #    print "THASVALS: $hasvals\n";
 507 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 508     my @ids=();
 509     my $sql=("SELECT tags.name FROM (\n" .
 510              $self->tags_subselect() .
 511              ") AS subselect\n" .
 512              "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n" .
 513              "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n");
 514     my @allused=$self->used_tags();
 515     my @used=grep { ref($_) ne "ARRAY"; } @allused;
 516     my @used_with_vals=grep { ref($_) eq "ARRAY"; } @allused;
 517 #    print "tags(): USED: ", join(", ", @used), "\n";
 518 #    print "tags(): USED_WITH_VALS: ", join(", ", map { "[".$_->[0]. ", ".$_->[1]."]";} @used_with_vals), "\n";
 519     my @orclauses=();
 520     my @andclauses=();
 521     my $id=$self->trailing_tag_id();
 522     if($hasvals)
 523     {
 524 #       print "HAS_VALUES\n";
 525         my @values=map { "'".$_->[1]."'"; } grep { $_->[0] == $id; } @used_with_vals;
 526         my $clause="(tags.parents_id='$id'";
 527         if(@values)
 528         {
 529             $clause .= " AND tags.id NOT IN (" . join(', ', @values) . ")";
 530         }
 531         $clause .= ")";
 532         push(@andclauses, $clause);
 533     }
 534     else
 535     {
 536 #       print "HASNT VALUES\n";;
 537         if(@used)
 538         {
 539             push(@andclauses, "(NOT (tags.parents_id='' AND tags.id IN (" . join(', ', @used) . ")))");
 540         }
 541         for my $pair (@used_with_vals)
 542         {
 543             push(@andclauses, "(NOT (tags.parents_id='" . $pair->[0] . "' AND tags.id='" . $pair->[1] . "'))");
 544         }
 545     }
 546
 547     my $parentclause= "(tags.parents_id='";
 548     if($hasvals)
 549     {
 550         $parentclause .= $id;
 551     }
 552     elsif($parent)
 553     {
 554         $parentclause .= $parent;
 555     }
 556     $parentclause .= "')";
 557     push(@andclauses, $parentclause);
 558
 559     if(@orclauses)
 560     {
 561         push(@andclauses, '( ' . join(' OR ', @orclauses) . ' )');
 562     }
 563     if(@andclauses)
 564     {
 565         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 566     }
 567     $sql .= "GROUP BY tags.name;";
 568     print "SQL(TAGS): $sql\n" if($self->{verbose});
 569     my @tagnames=$self->{db}->cmd_firstcol($sql);
 570     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 571     return(@tagnames);
 572 }
 573
 574 sub artists
 575 {
 576     my($self)=@_;
 577     if(!@{$self->{elements}}) # /ALL
 578     {
 579         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 580         return($self->{db}->cmd_firstcol($sql));
 581     }
 582     my @ids=();
 583     my $sql=$self->sql_start("artists.name");
 584     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 585              "WHERE artists.name != ''\n" .
 586              "GROUP BY artists.name;");
 587     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 588     my @tagnames=$self->{db}->cmd_firstcol($sql);
 589     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 590     return(@tagnames);
 591 }
 592
 593 sub albums
 594 {
 595     my($self)=@_;
 596     my @ids=();
 597     my $tail=$self->tail();
 598     if($self->is("artist", $tail))
 599     {
 600         return $self->artist_albums($tail->id());
 601     }
 602     my $sql=$self->sql_start("albums.name");
 603     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 604              "WHERE albums.name != ''\n" .
 605              "GROUP BY albums.name;");
 606     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 607     my @names=$self->{db}->cmd_firstcol($sql);
 608     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 609     return(@names);
 610 }
 611
 612 sub artist_albums
 613 {
 614     my($self, $artist_id)=@_;
 615     my $sql=$self->sql_start("albums.name");
 616     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 617              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 618              "WHERE artists.id=? and albums.name <> ''\n" .
 619              "GROUP BY albums.name\n");
 620     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 621     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 622     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 623     return(@albums);
 624 }
 625
 626 sub artist_tracks
 627 {
 628     my($self, $artist_id)=@_;
 629     my $sql=$self->sql_start("files.name");
 630     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 631              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 632              "WHERE artists.id=? AND albums.name=''\n" .
 633              "GROUP BY files.name\n");
 634     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 635     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 636     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 637     return(@names);
 638 }
 639
 640 sub album_tracks
 641 {
 642     my($self, $artist_id, $album_id)=@_;
 643     my $sql=("SELECT files.name FROM files\n" .
 644              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 645              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 646              "WHERE artists.id=? AND albums.id=?\n" .
 647              "GROUP BY files.name\n");
 648     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 649     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 650     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 651     return(@names);
 652 }
 653
 654 sub tracks
 655 {
 656     my($self)=@_;
 657     my $tail=$self->tail();
 658     if($self->is("artist", $tail))
 659     {
 660         return $self->artist_tracks($tail->id());
 661     }
 662     elsif($self->is("album", $tail))
 663     {
 664         my $artist_id=0;
 665         my $artist=$self->tail_parent();
 666         if($self->is("artist", $artist))
 667         {
 668             # should always happen
 669             $artist_id=$artist->id();
 670         }
 671         return $self->album_tracks($artist_id, $tail->id());
 672     }
 673     my $sql=$self->sql_start("files.name");
 674     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 675     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 676     {
 677         $sql .= "WHERE artists.name =''\n";
 678     }
 679     $sql .= "GROUP BY files.name;";
 680     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 681     my @names=$self->{db}->cmd_firstcol($sql);
 682     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 683     return(@names);
 684 }
 685
 686 sub filename
 687 {
 688     my($self, $mountpoint)=@_;
 689     my $tail=$self->tail();
 690     if($self->is("file", $tail))
 691     {
 692         my $id=$tail->id();
 693         my $sql=("SELECT paths.name, files.name FROM files\n" .
 694                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 695                  "WHERE files.id=?\n" .
 696                  "GROUP BY paths.name, files.name");
 697         print "FILENAME SQL: $sql\n" if($self->{verbose});
 698         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 699         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 700         return($self->{db}->relativise($path, $name, $mountpoint));
 701     }
 702     # should never happen
 703     return "ERROR";
 704 }
 705
 706 sub tags_subselect
 707 {
 708     my($self)=@_;
 709     my $hasvals=$self->expecting_values();
 710     # we need to specially handle a bare /NOT/tag with no other clauses,
 711     # using a simple WHERE id !='tagid' instead of a LEFT JOIN
 712     if($self->{bare_not})
 713     {
 714         return $self->bare_not_subselect();
 715     }
 716     if($self->{in_all})
 717     {
 718         return "\tSELECT id FROM files AS files_id\n";
 719     }
 720     my $tree=$self->{tagtree};
 721     print "UNDEF!!\n" unless($self->{tagtree});
 722     my $parent=$self->trailing_tag_parent();
 723
 724 #    print "ELEMENTS: ", join('/', map { $_->{name}; } @{$self->{elements}}), "\n";
 725 #    print "TREE: ", $tree->print(), "\n";
 726     my $tag=undef;
 727     if($hasvals)
 728     {
 729         $tag=$self->trailing_tag_id();
 730 #       print "Trailing id: $tag\n";
 731     }
 732     my ($sqlclause, @joins)=(undef, ());
 733     ($sqlclause, @joins) = $tree->to_sql($hasvals) if($tree);
 734 #    print "SQL(" . scalar(@joins) .": $sqlclause\n";
 735     my $sql="\tSELECT fxt1.files_id FROM tags t1";
 736     my @crosses=();
 737     my @inners=();
 738 #    $joinsneeded++ if($tag);
 739     for(my $i=0; $i <= $#joins; $i++)
 740     {
 741         my $cnt=$i+1;
 742         my $join=$joins[$i];
 743         my $inner=("\t$join JOIN files_x_tags fxt$cnt ON " .
 744                    "t${cnt}.id=fxt${cnt}.tags_id");
 745         if($i > 0)
 746         {
 747             push(@crosses, "CROSS JOIN tags t$cnt");
 748             $inner .= " AND fxt1.files_id=fxt${cnt}.files_id";
 749         }
 750         push(@inners, $inner);
 751     }
 752     $sql .= ("\n\t" . join(" ", @crosses)) if(@crosses);
 753     $sql .= ("\n" . join("\n", @inners)) if(@inners);
 754     $sql .= "\n\tWHERE $sqlclause" if($sqlclause);
 755 #    if($tag)
 756 #    {
 757 #       $sql .= " AND t${joinsneeded}.parents_id='$tag'";
 758 #    }
 759     $sql .= "\n\tGROUP BY fxt1.files_id\n";
 760     return $sql;
 761 }
 762
 763 sub bare_not_subselect
 764 {
 765     my($self)=@_;
 766     my @tags=grep { $self->is("tag", $_); } @{$self->{elements}};
 767     my $sql=("\tSELECT f1.id AS files_id FROM files f1 WHERE f1.id NOT IN (\n" .
 768              "\t\tSELECT fxt1.files_id FROM tags t1\n" .
 769              "\t\tINNER JOIN files_x_tags fxt1 ON t1.id=fxt1.tags_id\n" .
 770              "\t\tWHERE ");
 771     if(scalar(@tags) > 1)
 772     {
 773         $sql .= ("(t1.parents_id='" . $tags[0]->id() . "' AND t1.id='" .
 774                  $tags[1]->id() . "')");
 775     }
 776     else
 777     {
 778         $sql .= ("(t1.parents_id='' AND t1.id='" . $tags[0]->id() . "')");
 779     }
 780     $sql .= "\n\t\tGROUP BY fxt1.files_id\n\t)\n";
 781     return($sql);
 782 }
 783
 784 sub sql_start
 785 {
 786     my($self, $tables)=@_;
 787     my $sql="SELECT $tables FROM ";
 788     if($self->{in_all})
 789     {
 790         $sql .= "files\n";
 791     }
 792     else
 793     {
 794         $sql .= ("(\n" .
 795                  $self->tags_subselect() .
 796                  ") AS subselect\n" .
 797                  "INNER JOIN files ON subselect.files_id=files.id\n");
 798     }
 799     return $sql;
 800 }
 801
 802
 803 sub constraints_tag_list
 804 {
 805     my($self, @constraints)=@_;
 806     my $lasttag=undef;
 807     my @tags=();
 808     my @tags_vals=();
 809     for my $constraint (@constraints)
 810     {
 811 #       print ref($constraint), ": ", $constraint->{name}, "\n";
 812         if($self->is("tag", $constraint))
 813         {
 814             if(defined($lasttag))
 815             {
 816 #               print "TAGVAL\n";
 817                 push(@tags_vals, [$lasttag, $constraint->id()]) if defined($constraint->id());
 818                 $lasttag=undef;
 819             }
 820             elsif($self->tag_has_values($constraint->id()))
 821             {
 822 #               print "HASVALUES\n";
 823                 $lasttag=$constraint->id() if defined($constraint->id());
 824             }
 825             else
 826             {
 827 #               print "NOVALUES\n";
 828                 push(@tags, $constraint->id()) if(defined($constraint->id()));
 829             }
 830         }
 831     }
 832     @tags=map{ "\"$_\""; } @tags;
 833     @tags_vals=map( { [ map({ "\"$_\""; } @$_ ) ] } @tags_vals);
 834     $lasttag="\"$lasttag\"" if defined($lasttag);
 835     return(\@tags, \@tags_vals, $lasttag);
 836 }
 837
 838 # we just filter $ALLTRACKS, $NOARTIST and $NOALBUM
 839 # filtering tags properly requires up to four levels of recursion
 840 # (tag/tagval/AND/NOT) and is too slow
 841 sub filter
 842 {
 843     my($self, @dirs)=@_;
 844     my $base=$self->{path};
 845     my @outdirs=();
 846     for my $dir (@dirs)
 847     {
 848 #       print "\nFILTER (",$self->state(), "): $base / $dir\n";
 849         if($self->empty("$base/$dir"))
 850         {
 851 #           print "empty: $base / $dir\n";
 852         }
 853         else
 854         {
 855 #           print "non-empty, accepting: $base / $dir\n";
 856             push(@outdirs, $dir);
 857         }
 858     }
 859     return(@outdirs);
 860 }
 861
 862 sub empty
 863 {
 864     my($self, $dir)=@_;
 865     my $path=ID3FS::Path->new($self->{db}, $dir, $self->{verbose},
 866                               ($self->{maxtagdepth} - $self->{curtagdepth}));
 867     return 1 unless($path->isvalid());
 868     my($subdirs,$subfiles)=$path->dirents();
 869     return 0 if(@$subfiles || @$subdirs);
 870     return 1;
 871 }
 872
 873 1;