lib/ID3FS/Path.pm

   1 # id3fs - a FUSE-based filesystem for browsing audio metadata
   2 # Copyright (C) 2010  Ian Beckwith <ianb@erislabs.net>
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 package ID3FS::Path;
  18
  19 use strict;
  20 use warnings;
  21 use ID3FS::Path::Node;
  22
  23 our ($STATE_INVALID, $STATE_ROOT, $STATE_TAG, $STATE_BOOLEAN,
  24      $STATE_ALBUMS, $STATE_TRACKLIST, $STATE_FILE, $STATE_ALL)=(0..7);
  25
  26 # operator precedence
  27 our %priorities=( "OR" => 0, "AND" => 1, "NOT" => 2 );
  28
  29 our $PATH_ALLTRACKS= "TRACKS";
  30 our $PATH_NOARTIST = "NOARTIST";
  31 our $PATH_NOALBUM  = "NOALBUM";
  32
  33 our $ENABLE_FILTER = 0;
  34
  35 sub new
  36 {
  37     my $proto=shift;
  38     my $class=ref($proto) || $proto;
  39     my $self={};
  40     bless($self,$class);
  41
  42     $self->{elements}=[];
  43     $self->{db}=shift;
  44     $self->{path}=shift;
  45     $self->{verbose}=shift;
  46     $self->{maxtagdepth}=shift;
  47     $self->{curtagdepth}=0;
  48     $self->{path} =~ s/\/\//\//g; # drop doubled slashes
  49
  50     $self->parse();
  51 #    print "STATE: ", $self->state(), "\n";
  52     return $self;
  53 }
  54
  55 sub isdir
  56 {
  57     my($self)=@_;
  58     if(($self->state() == $STATE_FILE) ||
  59        ($self->state() == $STATE_INVALID))
  60     {
  61         return 0;
  62     }
  63     return 1;
  64 }
  65
  66 sub isfile
  67 {
  68     my($self)=@_;
  69     return($self->state() == $STATE_FILE);
  70 }
  71
  72 sub isvalid
  73 {
  74     my($self)=@_;
  75     return($self->state() != $STATE_INVALID);
  76 }
  77
  78 sub dest
  79 {
  80     my($self, $mountpoint)=@_;
  81     if($self->state() == $STATE_FILE)
  82     {
  83         return $self->filename($mountpoint);
  84     }
  85     return "ERROR"; #should never happen?
  86 }
  87
  88 sub dirents
  89 {
  90     my($self)=@_;
  91     my @dents=();
  92     my @fents=();
  93     my $state=$self->state();
  94 #    print "DIRENTS: STATE: $state\n";
  95 #    print "DIRENTS: FILE: $self->{path}\n";
  96     if($state==$STATE_ALL)
  97     {
  98         @dents=($self->filter($PATH_ALLTRACKS, $PATH_NOARTIST), $self->artists());
  99     }
 100     elsif($state==$STATE_TAG)
 101     {
 102         my $tail=$self->tail();
 103         if($self->is($TYPE_TAG, $tail) && $self->{db}->tag_has_values($tail->id()))
 104         {
 105             @dents=$self->tags();
 106         }
 107         else
 108         {
 109             if($self->{maxtagdepth} && ($self->{curtagdepth} < $self->{maxtagdepth}))
 110             {
 111                 @dents=qw(AND OR);
 112             }
 113             push(@dents, $self->filter($PATH_ALLTRACKS, $PATH_NOARTIST), $self->artists());
 114         }
 115     }
 116     elsif($state==$STATE_BOOLEAN)
 117     {
 118         my $parent=$self->tail();
 119         unless($self->is($TYPE_BOOL, $parent) && $parent->name() eq "NOT")
 120         {
 121             @dents=("NOT");
 122         }
 123         push(@dents,$self->tags());
 124     }
 125     elsif($state==$STATE_ROOT)
 126     {
 127         @dents=(qw(ALL NOT), $self->tags());
 128     }
 129     elsif($state==$STATE_ALBUMS)
 130     {
 131         @dents=$self->filter($PATH_ALLTRACKS, $PATH_NOALBUM, $self->albums());
 132     }
 133     elsif($state==$STATE_TRACKLIST)
 134     {
 135         @fents=$self->tracks();
 136     }
 137     else
 138     {
 139         print "id3fsd: INTERNAL ERROR: DIRENTS: UNHANDLED STATE: $state\n";
 140     }
 141     return(\@dents, \@fents);
 142 }
 143
 144 # State Machine Of Doom
 145 sub parse
 146 {
 147     my($self)=@_;
 148     $self->state($STATE_ROOT);
 149     return if($self->{path} eq "/");
 150     @{$self->{components}}=split(/\//, $self->{path});
 151     shift @{$self->{components}}; # drop empty field before leading /
 152 #    print "PATH: $self->{path}\n";
 153     my @parts=@{$self->{components}};
 154     my($tag, $tagval);
 155     $self->{elements}=[];
 156     $self->{in_all}=0;
 157     my $root_not=0;
 158     my $tags_seen=0;
 159     while(defined(my $name=shift @parts))
 160     {
 161 #       print "NAME: $name\n";
 162         my $state=$self->state();
 163         if($state==$STATE_INVALID)
 164         {
 165 #           print "SM: INVALID: $name\n";
 166             return;
 167         }
 168         elsif($state==$STATE_ROOT)
 169         {
 170 #           print "SM: ROOT: $name\n";
 171             if($name eq "ALL")
 172             {
 173                 $self->{in_all}=1;
 174                 $self->state($STATE_ALL);
 175             }
 176             elsif($name eq "NOT")
 177             {
 178                 $root_not=1;
 179                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, $TYPE_BOOL, $name));
 180                 $self->state($STATE_BOOLEAN);
 181             }
 182             else
 183             {
 184                 $tag=ID3FS::Path::Node->new($self->{db}, $TYPE_TAG, $name);
 185                 if($tag)
 186                 {
 187                     push(@{$self->{elements}}, $tag);
 188                     $tags_seen++;
 189                     $self->state($STATE_TAG);
 190                 }
 191                 else
 192                 {
 193                     $self->state($STATE_INVALID);
 194                 }
 195             }
 196         }
 197         elsif($state==$STATE_TAG)
 198         {
 199             my $tag=$self->tail();
 200 #           print "SM: TAG/TAGVAL($state): $name\n";
 201             if($self->is($TYPE_TAG, $tag) && $self->{db}->tag_has_values($tag->id()))
 202             {
 203 #               print "Parsing: parent: $tag->id()\n";
 204                 my $tagval=ID3FS::Path::Node->new($self->{db}, $TYPE_TAG, $name, $tag->id());
 205                 if(defined($tagval))
 206                 {
 207                     # stay in tag state
 208                     push(@{$self->{elements}}, $tagval);
 209                 }
 210                 else
 211                 {
 212                     $self->state($STATE_INVALID);
 213                 }
 214             }
 215             elsif($name eq $PATH_ALLTRACKS)
 216             {
 217                 $self->state($STATE_TRACKLIST);
 218             }
 219             elsif($name eq $PATH_NOARTIST)
 220             {
 221                 $self->state($STATE_TRACKLIST);
 222             }
 223             elsif($name eq "AND")
 224             {
 225                 $self->state($STATE_BOOLEAN);
 226                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, $TYPE_BOOL, $name));
 227             }
 228             elsif($name eq "OR")
 229             {
 230                 $self->state($STATE_BOOLEAN);
 231                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, $TYPE_BOOL, $name));
 232             }
 233             else
 234             {
 235                 my $artist=ID3FS::Path::Node->new($self->{db}, $TYPE_ARTIST, $name);
 236                 if($artist)
 237                 {
 238                     push(@{$self->{elements}}, $artist);
 239                     $self->state($STATE_ALBUMS);
 240                 }
 241                 else
 242                 {
 243                     $self->state($STATE_INVALID);
 244                 }
 245             }
 246         }
 247         elsif($state==$STATE_BOOLEAN)
 248         {
 249 #           print "SM: BOOLEAN: $name\n";
 250             my $parent=$self->tail();
 251             my $allownot=1;
 252             if($self->is($TYPE_BOOL, $parent) &&
 253                $parent->name() eq "NOT")
 254             {
 255                 $allownot=0;
 256             }
 257             if($allownot && $name eq "NOT")
 258             {
 259                 $self->state($STATE_BOOLEAN);
 260                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, $TYPE_BOOL, $name));
 261             }
 262             else
 263             {
 264                 my $tag=ID3FS::Path::Node->new($self->{db}, $TYPE_TAG, $name);
 265                 if($tag)
 266                 {
 267                     push(@{$self->{elements}}, $tag);
 268                     $tags_seen++;
 269                     $self->state($STATE_TAG);
 270                 }
 271                 else
 272                 {
 273                     $self->state($STATE_INVALID);
 274                 }
 275             }
 276         }
 277         elsif($state==$STATE_ALBUMS)
 278         {
 279 #           print "SM: ALBUM: $name\n";
 280             if($name eq $PATH_ALLTRACKS)
 281             {
 282                 $self->state($STATE_TRACKLIST);
 283             }
 284             elsif($name eq $PATH_NOALBUM)
 285             {
 286                 $self->state($STATE_TRACKLIST);
 287             }
 288             else
 289             {
 290                 my $album=ID3FS::Path::Node->new($self->{db}, $TYPE_ALBUM, $name);
 291                 if($album)
 292                 {
 293                     push(@{$self->{elements}}, $album);
 294                     $self->state($STATE_TRACKLIST);
 295                 }
 296                 else
 297                 {
 298                     $self->state($STATE_INVALID);
 299                 }
 300             }
 301         }
 302         elsif($state==$STATE_TRACKLIST)
 303         {
 304 #           print "SM: TRACKLIST: $name\n";
 305             my $track=ID3FS::Path::Node->new($self->{db}, $TYPE_FILE, $name);
 306             if($track)
 307             {
 308                 push(@{$self->{elements}}, $track);
 309                 $self->state($STATE_FILE);
 310             }
 311             else
 312             {
 313                 $self->state($STATE_INVALID);
 314             }
 315         }
 316         elsif($state==$STATE_FILE)
 317         {
 318 #           print "SM: FILE: $name\n";
 319             # Can't have anything after a filename
 320             $self->state($STATE_INVALID);
 321         }
 322         elsif($state==$STATE_ALL)
 323         {
 324             if($name eq $PATH_ALLTRACKS)
 325             {
 326                 $self->state($STATE_TRACKLIST);
 327             }
 328             elsif($name eq $PATH_NOARTIST)
 329             {
 330                 $self->state($STATE_TRACKLIST);
 331             }
 332             else
 333             {
 334                 my $artist=ID3FS::Path::Node->new($self->{db}, $TYPE_ARTIST, $name);
 335                 if($artist)
 336                 {
 337                     push(@{$self->{elements}}, $artist);
 338                     $self->state($STATE_ALBUMS);
 339                 }
 340                 else
 341                 {
 342                     $self->state($STATE_INVALID);
 343                 }
 344             }
 345         }
 346         else
 347         {
 348             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 349             $self->state($STATE_INVALID);
 350         }
 351     }
 352
 353     my @elements=@{$self->{elements}};
 354     # remove trailing boolean
 355     while(@elements && $self->is($TYPE_BOOL, $elements[$#elements]))
 356     {
 357         pop @elements;
 358     }
 359 #    print "\nELEMENTS: ", join(' ', map { $_->name(); } @elements), "\n";
 360     my @joins=$self->number_joins(@elements);
 361     @joins=qw(INNER) unless(@joins);
 362     $self->{joins}=\@joins;
 363 #    print "AFTER: ", join(' ', map { $_->name() . "(" . $_->{table} . ")"; } @elements), "\n";
 364 #    print "JOINS: ", join(', ', @joins), "\n";
 365     # sort elements by precedence
 366     @elements=$self->sort_elements(@elements);
 367     $self->{tagtree}=$self->elements_to_tree(\@elements);
 368 }
 369
 370 sub number_joins
 371 {
 372     my($self, @elements)=@_;
 373     my @joins=("INNER");
 374     my $table=1;
 375     my $nextjoin=undef;
 376     my $lastop=undef;
 377     return (@joins) unless(@elements);
 378     while(my $node=shift @elements)
 379     {
 380         if($node->type() == $TYPE_BOOL)
 381         {
 382             my $op=$node->name();
 383             if($op eq "AND")
 384             {
 385                 $nextjoin="INNER";
 386             }
 387             elsif($op eq "NOT")
 388             {
 389                 $nextjoin="LEFT";
 390             }
 391             elsif($op eq "OR")
 392             {
 393                 # NOT/foo/OR needs an extra join
 394                 $nextjoin="INNER" if($lastop && $lastop eq "NOT");
 395             }
 396             $lastop=$op;
 397         }
 398         else
 399         {
 400             if(@elements)
 401             {
 402                 # if tag has a value, eat the tag, shifting to the value
 403                 if($elements[0]->type() == $TYPE_TAG)
 404                 {
 405                     $node->hasvals(1);
 406                     $node=shift(@elements);
 407                 }
 408                 else
 409                 {
 410                     $node->hasvals(0);
 411                 }
 412             }
 413             elsif($self->{db}->tag_has_values($node->id()))
 414             {
 415                 # if the expression ends in a tag that has a value
 416                 # (ie we have the tag and want the value)
 417                 # use an INNER join even if we were in a NOT
 418                 $nextjoin="INNER" if($nextjoin);
 419             }
 420             if($nextjoin)
 421             {
 422                 $table++;
 423                 push(@joins, $nextjoin);
 424                 $nextjoin=undef;
 425             }
 426             $node->table($table);
 427         }
 428     }
 429     return @joins;
 430 }
 431
 432 sub state
 433 {
 434     my($self, $newstate)=@_;
 435     if(defined($newstate))
 436     {
 437         $self->{state}=$newstate;
 438         $self->{curtagdepth}++ if($newstate == $STATE_TAG);
 439     }
 440     return $self->{state};
 441 }
 442
 443 # link up precedence-sorted list into a binary tree
 444 sub elements_to_tree
 445 {
 446     my($self, $elements)=@_;
 447     return undef unless(@$elements);
 448     my ($left, $right, $op)=(undef, undef, undef);
 449     my $node=pop @$elements;
 450     if($self->is($TYPE_BOOL, $node))
 451     {
 452         $right=$self->elements_to_tree($elements);
 453         if($node->name() ne "NOT")
 454         {
 455             $left=$self->elements_to_tree($elements);
 456         }
 457         $node->left($left);
 458         $node->right($right);
 459     }
 460     return $node;
 461 }
 462
 463 # Dijkstra's shunting-yard algorithm
 464 sub sort_elements
 465 {
 466     my ($self, @input)=@_;
 467     my @opstack=();
 468     my @output=();
 469     while(my $node = shift @input)
 470     {
 471         if($self->is($TYPE_TAG, $node))
 472         {
 473             # Handle tag values by dropping parent
 474             if(@input && $self->is($TYPE_TAG, $input[0]))
 475             {
 476                 $node=shift @input;
 477             }
 478             push(@output, $node);
 479         }
 480         elsif($self->is($TYPE_BOOL, $node))
 481         {
 482             while(@opstack &&
 483                   ($priorities{$node->name()} <= $priorities{$opstack[$#opstack]->name()}))
 484             {
 485                 push(@output, pop(@opstack));
 486             }
 487             push(@opstack, $node);
 488         }
 489     }
 490     while(@opstack)
 491     {
 492         push(@output, pop(@opstack));
 493     }
 494     return @output;
 495 }
 496
 497 sub used_tags
 498 {
 499     my($self)=@_;
 500     return() unless(defined($self->{tagtree}));
 501     return($self->{tagtree}->used_tags());
 502 }
 503
 504 sub expecting_values
 505 {
 506     my($self)=@_;
 507     my $tail=$self->tail();
 508     if($self->is($TYPE_TAG, $tail))
 509     {
 510         return($self->{db}->tag_has_values($tail->id()));
 511     }
 512 }
 513
 514 sub trailing_tag_id
 515 {
 516     my($self)=@_;
 517     my $tail=$self->tail();
 518     if($self->is($TYPE_TAG, $tail))
 519     {
 520         return($tail->id());
 521     }
 522     return undef;
 523 }
 524
 525 sub trailing_tag_parent
 526 {
 527     my($self)=@_;
 528     my $tail=$self->tail();
 529     if($self->is($TYPE_TAG, $tail))
 530     {
 531         return($tail->{parents_id});
 532     }
 533     return undef;
 534 }
 535
 536 sub tail
 537 {
 538     my($self)=@_;
 539     return($self->{elements}->[$#{$self->{elements}}]);
 540 }
 541
 542 sub is
 543 {
 544     my($self, $type, $node)=@_;
 545     return 0 unless($node);
 546     return 0 unless($node->type());
 547     return 1 if($type == $node->type());
 548     return 0;
 549 }
 550
 551 # the one before last
 552 sub tail_parent
 553 {
 554     my($self)=@_;
 555     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 556 }
 557
 558 ######################################################################
 559
 560 sub tags
 561 {
 562     my($self)=@_;
 563     if(!$self->{tagtree}) # / or /NOT
 564     {
 565         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 566         return($self->{db}->cmd_firstcol($sql));
 567     }
 568     my $sql="SELECT tags.name FROM ";
 569     if($self->want_all_tags())
 570     {
 571         $sql .= "files_x_tags\n";
 572     }
 573     else
 574     {
 575         $sql .= ("(\n" .
 576                  $self->tags_subselect() .
 577                  ") AS subselect\n" .
 578                  "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n");
 579     }
 580     $sql .= "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n";
 581     my @andclauses=();
 582     my $id=$self->trailing_tag_id();
 583
 584     my $parentclause= "tags.parents_id='";
 585     $parentclause .= $id if($self->expecting_values());
 586     $parentclause .= "'";
 587     push(@andclauses, $parentclause);
 588
 589     my @used=$self->used_tags();
 590     if(@used)
 591     {
 592         push(@andclauses, "tags.id NOT IN (" . join(', ', @used) . ")");
 593     }
 594     if(@andclauses)
 595     {
 596         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 597     }
 598
 599     $sql .= "GROUP BY tags.name;";
 600     print "SQL(TAGS): $sql\n" if($self->{verbose});
 601     my @tagnames=$self->{db}->cmd_firstcol($sql);
 602     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 603     return(@tagnames);
 604 }
 605
 606 sub artists
 607 {
 608     my($self)=@_;
 609     if(!@{$self->{elements}}) # /ALL
 610     {
 611         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 612         return($self->{db}->cmd_firstcol($sql));
 613     }
 614     my $sql=$self->sql_start("artists.name");
 615     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 616              "WHERE artists.name != ''\n" .
 617              "GROUP BY artists.name;");
 618     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 619     my @tagnames=$self->{db}->cmd_firstcol($sql);
 620     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 621     return(@tagnames);
 622 }
 623
 624 sub albums
 625 {
 626     my($self)=@_;
 627     my $tail=$self->tail();
 628     if($self->is($TYPE_ARTIST, $tail))
 629     {
 630         return $self->artist_albums($tail->id());
 631     }
 632     my $sql=$self->sql_start("albums.name");
 633     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 634              "WHERE albums.name != ''\n" .
 635              "GROUP BY albums.name;");
 636     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 637     my @names=$self->{db}->cmd_firstcol($sql);
 638     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 639     return(@names);
 640 }
 641
 642 sub artist_albums
 643 {
 644     my($self, $artist_id)=@_;
 645     my $sql=$self->sql_start("albums.name");
 646     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 647              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 648              "WHERE artists.id=? and albums.name <> ''\n" .
 649              "GROUP BY albums.name\n");
 650     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 651     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 652     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 653     return(@albums);
 654 }
 655
 656 sub artist_tracks
 657 {
 658     my($self, $artist_id)=@_;
 659     my $sql=$self->sql_start("files.name");
 660     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 661              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 662              "WHERE artists.id=? AND albums.name=''\n" .
 663              "GROUP BY files.name\n");
 664     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 665     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 666     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 667     return(@names);
 668 }
 669
 670 sub album_tracks
 671 {
 672     my($self, $artist_id, $album_id)=@_;
 673     my $sql=("SELECT files.name FROM files\n" .
 674              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 675              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 676              "WHERE artists.id=? AND albums.id=?\n" .
 677              "GROUP BY files.name\n");
 678     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 679     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 680     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 681     return(@names);
 682 }
 683
 684 sub tracks
 685 {
 686     my($self)=@_;
 687     my $tail=$self->tail();
 688     if($self->is($TYPE_ARTIST, $tail))
 689     {
 690         return $self->artist_tracks($tail->id());
 691     }
 692     elsif($self->is($TYPE_ALBUM, $tail))
 693     {
 694         my $artist_id=0;
 695         my $artist=$self->tail_parent();
 696         if($self->is($TYPE_ARTIST, $artist))
 697         {
 698             # should always happen
 699             $artist_id=$artist->id();
 700         }
 701         return $self->album_tracks($artist_id, $tail->id());
 702     }
 703     my $sql=$self->sql_start("files.name");
 704     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 705     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 706     {
 707         $sql .= "WHERE artists.name =''\n";
 708     }
 709     $sql .= "GROUP BY files.name;";
 710     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 711     my @names=$self->{db}->cmd_firstcol($sql);
 712     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 713     return(@names);
 714 }
 715
 716 sub filename
 717 {
 718     my($self, $mountpoint)=@_;
 719     my $tail=$self->tail();
 720     if($self->is($TYPE_FILE, $tail))
 721     {
 722         my $id=$tail->id();
 723         my $sql=("SELECT paths.name, files.name FROM files\n" .
 724                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 725                  "WHERE files.id=?\n" .
 726                  "GROUP BY paths.name, files.name");
 727         print "FILENAME SQL: $sql\n" if($self->{verbose});
 728         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 729         return($self->{db}->relativise($path, $name, $mountpoint, $self->{path}));
 730     }
 731     # should never happen
 732     return "ERROR";
 733 }
 734
 735 sub tags_subselect
 736 {
 737     my($self)=@_;
 738     my $tree=$self->{tagtree};
 739 #    use Data::Dumper;
 740 #    print Dumper $tree;
 741     my ($sqlclause, @joins)=$tree->to_sql() if($tree);
 742     my $sql="\tSELECT fxt1.files_id FROM tags t1";
 743     my @crosses=();
 744     my @inners=();
 745     @joins=@{$self->{joins}};
 746     for(my $i=0; $i <= $#joins; $i++)
 747     {
 748         my $cnt=$i+1;
 749         my $join=$joins[$i];
 750         my $inner=("\t$join JOIN files_x_tags fxt$cnt ON " .
 751                    "t${cnt}.id=fxt${cnt}.tags_id");
 752         if($i > 0)
 753         {
 754             push(@crosses, "CROSS JOIN tags t$cnt");
 755             $inner .= " AND fxt1.files_id=fxt${cnt}.files_id";
 756         }
 757         push(@inners, $inner);
 758     }
 759     $sql .= ("\n\t" . join(" ", @crosses)) if(@crosses);
 760     $sql .= ("\n" . join("\n", @inners)) if(@inners);
 761     $sql .= "\n\tWHERE $sqlclause" if($sqlclause);
 762     $sql .= "\n\tGROUP BY fxt1.files_id\n";
 763     return $sql;
 764 }
 765
 766 sub sql_start
 767 {
 768     my($self, $tables)=@_;
 769     my $sql="SELECT $tables FROM ";
 770     if($self->{in_all})
 771     {
 772         $sql .= "files\n";
 773     }
 774     else
 775     {
 776         $sql .= ("(\n" .
 777                  $self->tags_subselect() .
 778                  ") AS subselect\n" .
 779                  "INNER JOIN files ON subselect.files_id=files.id\n");
 780     }
 781     return $sql;
 782 }
 783
 784 # we just filter $ALLTRACKS, $NOARTIST and $NOALBUM
 785 # filtering tags properly requires up to four levels of recursion
 786 # (tag/tagval/AND/NOT) and is too slow
 787 sub filter
 788 {
 789     my($self, @dirs)=@_;
 790     return(@dirs) unless($ENABLE_FILTER);
 791     my $base=$self->{path};
 792     my @outdirs=();
 793     for my $dir (@dirs)
 794     {
 795         push(@outdirs, $dir) unless($self->empty("$base/$dir"));
 796     }
 797     return(@outdirs);
 798 }
 799
 800 sub empty
 801 {
 802     my($self, $dir)=@_;
 803     my $path=ID3FS::Path->new($self->{db}, $dir, $self->{verbose},
 804                               ($self->{maxtagdepth} - $self->{curtagdepth}));
 805     return 1 unless($path->isvalid());
 806     my($subdirs,$subfiles)=$path->dirents();
 807     return 0 if(@$subfiles || @$subdirs);
 808     return 1;
 809 }
 810
 811 # if path is .../OR/ or .../OR/NOT or .../AND/NOT
 812 sub want_all_tags
 813 {
 814     my($self)=@_;
 815     my $tail=$self->tail();
 816     return 0 unless($tail);
 817     my $parent=$self->tail_parent();
 818     my $parent_valid = ($parent && $parent->type() == $TYPE_BOOL);
 819     if($tail->type() == $TYPE_BOOL)
 820     {
 821         return 1 if($tail->name() eq "OR");
 822         return 0 unless($tail->name() eq "NOT");
 823         return 0 unless($parent_valid);
 824         return 1 if($parent->name() eq "OR");
 825         return 1 if($parent->name() eq "AND");
 826     }
 827     elsif($tail->type() == $TYPE_TAG)
 828     {
 829         return 0 unless($parent_valid);
 830         return 1 if($parent->name() eq "NOT");
 831     }
 832     return 0;
 833 }
 834
 835 1;