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_TAGVAL,
  24      $STATE_BOOLEAN, $STATE_ALBUMS, $STATE_TRACKLIST,
  25      $STATE_FILE, $STATE_ALL)=(0..8);
  26
  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 = 1;
  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 || $state==$STATE_TAGVAL)
 101     {
 102         if($state==$STATE_TAG && $self->at("tag") &&
 103            $self->{db}->tag_has_values($self->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("boolean", $parent) &&
 120                $parent->{name} eq "NOT")
 121         {
 122             @dents=("NOT");
 123         }
 124         push(@dents,$self->tags());
 125     }
 126     elsif($state==$STATE_ROOT)
 127     {
 128         @dents=(qw(ALL NOT), $self->tags());
 129     }
 130     elsif($state==$STATE_ALBUMS)
 131     {
 132         @dents=$self->filter($PATH_ALLTRACKS, $PATH_NOALBUM, $self->albums());
 133     }
 134     elsif($state==$STATE_TRACKLIST)
 135     {
 136         @fents=$self->tracks();
 137     }
 138     else
 139     {
 140         print "DIRENTS: UNHANDLED STATE: $state\n";
 141     }
 142     return(\@dents, \@fents);
 143 }
 144
 145 sub parse
 146 {
 147     my($self)=@_;
 148     @{$self->{components}}=split(/\//, $self->{path});
 149     shift @{$self->{components}}; # drop empty field before leading /
 150 #    print "PATH: $self->{path}\n";
 151     $self->state($STATE_ROOT);
 152     return if($self->{path} eq "/");
 153     my @parts=@{$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}, "boolean", $name));
 180                 $self->state($STATE_BOOLEAN);
 181             }
 182             else
 183             {
 184                 $tag=ID3FS::Path::Node->new($self->{db},"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 || $state==$STATE_TAGVAL)
 198         {
 199             my $tag=$self->tail();
 200 #           print "SM: TAG/TAGVAL($state): $name\n";
 201             if($state==$STATE_TAG && $self->is("tag", $tag) &&
 202                $self->{db}->tag_has_values($tag->id()))
 203             {
 204 #               print "Parsing: parent: $tag->id()\n";
 205                 my $tagval=ID3FS::Path::Node->new($self->{db}, "tag", $name, $tag->id());
 206                 if(defined($tagval))
 207                 {
 208                     $self->state($STATE_TAGVAL);
 209                     # stay in tag state
 210                     push(@{$self->{elements}}, $tagval);
 211                 }
 212                 else
 213                 {
 214                     $self->state($STATE_INVALID);
 215                 }
 216             }
 217             elsif($name eq $PATH_ALLTRACKS)
 218             {
 219                 $self->state($STATE_TRACKLIST);
 220             }
 221             elsif($name eq $PATH_NOARTIST)
 222             {
 223                 $self->state($STATE_TRACKLIST);
 224             }
 225             elsif($name eq "AND")
 226             {
 227                 $self->state($STATE_BOOLEAN);
 228                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, "boolean", $name));
 229             }
 230             elsif($name eq "OR")
 231             {
 232                 $self->state($STATE_BOOLEAN);
 233                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, "boolean", $name));
 234             }
 235             else
 236             {
 237                 my $artist=ID3FS::Path::Node->new($self->{db}, "artist", $name);
 238                 if($artist)
 239                 {
 240                     push(@{$self->{elements}}, $artist);
 241                     $self->state($STATE_ALBUMS);
 242                 }
 243                 else
 244                 {
 245                     $self->state($STATE_INVALID);
 246                 }
 247             }
 248         }
 249         elsif($state==$STATE_BOOLEAN)
 250         {
 251 #           print "SM: BOOLEAN: $name\n";
 252             my $parent=$self->tail();
 253             my $allownot=1;
 254             if($self->is("boolean", $parent) &&
 255                $parent->{name} eq "NOT")
 256             {
 257                 $allownot=0;
 258             }
 259             if($allownot && $name eq "NOT")
 260             {
 261                 $self->state($STATE_BOOLEAN);
 262                 push(@{$self->{elements}}, ID3FS::Path::Node->new($self->{db}, "boolean", $name));
 263             }
 264             else
 265             {
 266                 my $tag=ID3FS::Path::Node->new($self->{db}, "tag", $name);
 267                 if($tag)
 268                 {
 269                     push(@{$self->{elements}}, $tag);
 270                     $tags_seen++;
 271                     $self->state($STATE_TAG);
 272                 }
 273                 else
 274                 {
 275                     $self->state($STATE_INVALID);
 276                 }
 277             }
 278         }
 279         elsif($state==$STATE_ALBUMS)
 280         {
 281 #           print "SM: ALBUM: $name\n";
 282             if($name eq $PATH_ALLTRACKS)
 283             {
 284                 $self->state($STATE_TRACKLIST);
 285             }
 286             elsif($name eq $PATH_NOALBUM)
 287             {
 288                 $self->state($STATE_TRACKLIST);
 289             }
 290             else
 291             {
 292                 my $album=ID3FS::Path::Node->new($self->{db}, "album", $name);
 293                 if($album)
 294                 {
 295                     push(@{$self->{elements}}, $album);
 296                     $self->state($STATE_TRACKLIST);
 297                 }
 298                 else
 299                 {
 300                     $self->state($STATE_INVALID);
 301                 }
 302             }
 303         }
 304         elsif($state==$STATE_TRACKLIST)
 305         {
 306 #           print "SM: TRACKLIST: $name\n";
 307             my $track=ID3FS::Path::Node->new($self->{db}, "file", $name);
 308             if($track)
 309             {
 310                 push(@{$self->{elements}}, $track);
 311                 $self->state($STATE_FILE);
 312             }
 313             else
 314             {
 315                 $self->state($STATE_INVALID);
 316             }
 317         }
 318         elsif($state==$STATE_FILE)
 319         {
 320 #           print "SM: FILE: $name\n";
 321             # Can't have anything after a filename
 322             $self->state($STATE_INVALID);
 323         }
 324         elsif($state==$STATE_ALL)
 325         {
 326             if($name eq $PATH_ALLTRACKS)
 327             {
 328                 $self->state($STATE_TRACKLIST);
 329             }
 330             elsif($name eq $PATH_NOARTIST)
 331             {
 332                 $self->state($STATE_TRACKLIST);
 333             }
 334             else
 335             {
 336                 my $artist=ID3FS::Path::Node->new($self->{db}, "artist", $name);
 337                 if($artist)
 338                 {
 339                     push(@{$self->{elements}}, $artist);
 340                     $self->state($STATE_ALBUMS);
 341                 }
 342                 else
 343                 {
 344                     $self->state($STATE_INVALID);
 345                 }
 346             }
 347         }
 348         else
 349         {
 350             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 351             $self->state($STATE_INVALID);
 352         }
 353     }
 354
 355     # remove trailing boolean
 356     my @elements=@{$self->{elements}};
 357     while(@elements && $self->is("boolean", $elements[$#elements]))
 358     {
 359         pop @elements;
 360     }
 361     # sort elements by precedence
 362     @elements=$self->sort_elements(@elements);
 363     $self->{tagtree}=$self->elements_to_tree(\@elements);
 364     if($self->{tagtree})
 365     {
 366 #       use Data::Dumper;
 367 #       print "TREE\n";
 368 #       print Dumper $self->{tagtree};
 369 #       my ($conditions, @joins)=$self->{tagtree}->to_sql();
 370 #       print "CONDITIONS(", scalar(@joins), "): ", $conditions, "\n";
 371     }
 372 }
 373
 374 sub state
 375 {
 376     my($self, $newstate)=@_;
 377     if(defined($newstate))
 378     {
 379         $self->{state}=$newstate;
 380         $self->{curtagdepth}++ if($newstate == $STATE_TAG);
 381     }
 382     return $self->{state};
 383 }
 384
 385 sub elements_to_tree
 386 {
 387     my($self, $elements)=@_;
 388     return undef unless(@$elements);
 389     my ($left, $right, $op)=(undef, undef, undef);
 390     my $thing=pop @$elements;
 391     if($self->is("boolean", $thing))
 392     {
 393         $right=$self->elements_to_tree($elements);
 394         if($thing->{name} ne "NOT")
 395         {
 396             $left=$self->elements_to_tree($elements);
 397         }
 398         $thing->left($left);
 399         $thing->right($right);
 400     }
 401     return $thing;
 402 }
 403
 404 # Dijkstra's shunting-yard algorithm
 405 sub sort_elements
 406 {
 407     my ($self, @input)=@_;
 408     my @opstack=();
 409     my @output=();
 410 #    print "INPUT: ", join(', ', map { $_->{name}; } @input), "\n";
 411     while(my $thing = shift @input)
 412     {
 413         if($self->is("tag", $thing))
 414         {
 415             # Handle tag values by dropping parent
 416             if(@input && $self->is("tag", $input[0]))
 417             {
 418                 $thing=shift @input;
 419             }
 420             push(@output, $thing);
 421         }
 422         elsif($self->is("boolean", $thing))
 423         {
 424             # bool
 425             while(@opstack &&
 426                   ($priorities{$thing->{name}} <= $priorities{$opstack[$#opstack]->{name}}))
 427             {
 428                 push(@output, pop(@opstack));
 429             }
 430             push(@opstack, $thing);
 431         }
 432     }
 433     while(@opstack)
 434     {
 435         push(@output, pop(@opstack));
 436     }
 437 #    print "STACK: ", join(', ', map { $_->{name}; } @output), "\n";
 438     return @output;
 439 }
 440
 441 sub used_tags
 442 {
 443     my($self)=@_;
 444     return() unless(defined($self->{tagtree}));
 445     return($self->{tagtree}->used_tags());
 446 }
 447
 448 sub expecting_values
 449 {
 450     my($self)=@_;
 451     my $tail=$self->tail();
 452     if($self->is("tag", $tail))
 453     {
 454         return($self->{db}->tag_has_values($tail->id()));
 455     }
 456 }
 457
 458 sub trailing_tag_id
 459 {
 460     my($self)=@_;
 461     my $tail=$self->tail();
 462     if($self->is("tag", $tail))
 463     {
 464         return($tail->id());
 465     }
 466     return undef;
 467 }
 468
 469 sub trailing_tag_parent
 470 {
 471     my($self)=@_;
 472     my $tail=$self->tail();
 473     if($self->is("tag", $tail))
 474     {
 475         return($tail->{parents_id});
 476     }
 477     return undef;
 478 }
 479
 480 sub tail
 481 {
 482     my($self)=@_;
 483     return($self->{elements}->[$#{$self->{elements}}]);
 484 }
 485
 486 sub at
 487 {
 488     my($self, $type)=@_;
 489     return($self->is($type, $self->tail()));
 490 }
 491
 492 sub is
 493 {
 494     my($self, $type, $thing)=@_;
 495     return 0 unless($thing);
 496     return 0 unless($thing->type());
 497     return 1 if($type eq $thing->type());
 498     return 0;
 499 }
 500
 501 # the one before last
 502 sub tail_parent
 503 {
 504     my($self)=@_;
 505     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 506 }
 507
 508 ######################################################################
 509
 510 sub tags
 511 {
 512     my($self)=@_;
 513     if(!$self->{tagtree}) # / or /NOT
 514     {
 515         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 516         return($self->{db}->cmd_firstcol($sql));
 517     }
 518     my $hasvals=$self->expecting_values();
 519     my $parent=$self->trailing_tag_parent();
 520 #    print "THASVALS: $hasvals\n";
 521 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 522     my @ids=();
 523     my $sql="SELECT tags.name FROM ";
 524     if($self->in_or())
 525     {
 526         $sql .= "files_x_tags\n";
 527     }
 528     else
 529     {
 530         $sql .= ("(\n" .
 531                  $self->tags_subselect() .
 532                  ") AS subselect\n" .
 533                  "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n");
 534     }
 535     $sql .= "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n";
 536     my @andclauses=();
 537     my $id=$self->trailing_tag_id();
 538
 539     my $parentclause= "tags.parents_id='";
 540     if($hasvals)
 541     {
 542         $parentclause .= $id;
 543     }
 544     elsif($parent)
 545     {
 546         $parentclause .= $parent;
 547     }
 548     $parentclause .= "'";
 549     push(@andclauses, $parentclause);
 550
 551     my @used=$self->used_tags();
 552     if(@used)
 553     {
 554         push(@andclauses, "tags.id NOT IN (" . join(', ', @used) . ")");
 555     }
 556     if(@andclauses)
 557     {
 558         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 559     }
 560
 561     $sql .= "GROUP BY tags.name;";
 562     print "SQL(TAGS): $sql\n" if($self->{verbose});
 563     my @tagnames=$self->{db}->cmd_firstcol($sql);
 564     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 565     return(@tagnames);
 566 }
 567
 568 sub artists
 569 {
 570     my($self)=@_;
 571     if(!@{$self->{elements}}) # /ALL
 572     {
 573         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 574         return($self->{db}->cmd_firstcol($sql));
 575     }
 576     my @ids=();
 577     my $sql=$self->sql_start("artists.name");
 578     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 579              "WHERE artists.name != ''\n" .
 580              "GROUP BY artists.name;");
 581     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 582     my @tagnames=$self->{db}->cmd_firstcol($sql);
 583     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 584     return(@tagnames);
 585 }
 586
 587 sub albums
 588 {
 589     my($self)=@_;
 590     my @ids=();
 591     my $tail=$self->tail();
 592     if($self->is("artist", $tail))
 593     {
 594         return $self->artist_albums($tail->id());
 595     }
 596     my $sql=$self->sql_start("albums.name");
 597     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 598              "WHERE albums.name != ''\n" .
 599              "GROUP BY albums.name;");
 600     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 601     my @names=$self->{db}->cmd_firstcol($sql);
 602     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 603     return(@names);
 604 }
 605
 606 sub artist_albums
 607 {
 608     my($self, $artist_id)=@_;
 609     my $sql=$self->sql_start("albums.name");
 610     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 611              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 612              "WHERE artists.id=? and albums.name <> ''\n" .
 613              "GROUP BY albums.name\n");
 614     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 615     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 616     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 617     return(@albums);
 618 }
 619
 620 sub artist_tracks
 621 {
 622     my($self, $artist_id)=@_;
 623     my $sql=$self->sql_start("files.name");
 624     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 625              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 626              "WHERE artists.id=? AND albums.name=''\n" .
 627              "GROUP BY files.name\n");
 628     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 629     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 630     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 631     return(@names);
 632 }
 633
 634 sub album_tracks
 635 {
 636     my($self, $artist_id, $album_id)=@_;
 637     my $sql=("SELECT files.name FROM files\n" .
 638              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 639              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 640              "WHERE artists.id=? AND albums.id=?\n" .
 641              "GROUP BY files.name\n");
 642     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 643     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 644     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 645     return(@names);
 646 }
 647
 648 sub tracks
 649 {
 650     my($self)=@_;
 651     my $tail=$self->tail();
 652     if($self->is("artist", $tail))
 653     {
 654         return $self->artist_tracks($tail->id());
 655     }
 656     elsif($self->is("album", $tail))
 657     {
 658         my $artist_id=0;
 659         my $artist=$self->tail_parent();
 660         if($self->is("artist", $artist))
 661         {
 662             # should always happen
 663             $artist_id=$artist->id();
 664         }
 665         return $self->album_tracks($artist_id, $tail->id());
 666     }
 667     my $sql=$self->sql_start("files.name");
 668     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 669     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 670     {
 671         $sql .= "WHERE artists.name =''\n";
 672     }
 673     $sql .= "GROUP BY files.name;";
 674     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 675     my @names=$self->{db}->cmd_firstcol($sql);
 676     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 677     return(@names);
 678 }
 679
 680 sub filename
 681 {
 682     my($self, $mountpoint)=@_;
 683     my $tail=$self->tail();
 684     if($self->is("file", $tail))
 685     {
 686         my $id=$tail->id();
 687         my $sql=("SELECT paths.name, files.name FROM files\n" .
 688                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 689                  "WHERE files.id=?\n" .
 690                  "GROUP BY paths.name, files.name");
 691         print "FILENAME SQL: $sql\n" if($self->{verbose});
 692         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 693         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 694         return($self->{db}->relativise($path, $name, $mountpoint, $self->{path}));
 695     }
 696     # should never happen
 697     return "ERROR";
 698 }
 699
 700 sub tags_subselect
 701 {
 702     my($self)=@_;
 703     my $hasvals=$self->expecting_values();
 704     my $tree=$self->{tagtree};
 705     my $parent=$self->trailing_tag_parent();
 706
 707     my $tag=undef;
 708     if($hasvals)
 709     {
 710         $tag=$self->trailing_tag_id();
 711 #       print "Trailing id: $tag\n";
 712     }
 713     my ($sqlclause, @joins)=(undef, ());
 714     ($sqlclause, @joins) = $tree->to_sql($hasvals) if($tree);
 715 #    print "SQL(" . scalar(@joins) ."): $sqlclause\n";
 716     my $sql="\tSELECT fxt1.files_id FROM tags t1";
 717     my @crosses=();
 718     my @inners=();
 719 #    $joinsneeded++ if($tag);
 720     for(my $i=0; $i <= $#joins; $i++)
 721     {
 722         my $cnt=$i+1;
 723         my $join=$joins[$i];
 724         my $inner=("\t$join JOIN files_x_tags fxt$cnt ON " .
 725                    "t${cnt}.id=fxt${cnt}.tags_id");
 726         if($i > 0)
 727         {
 728             push(@crosses, "CROSS JOIN tags t$cnt");
 729             $inner .= " AND fxt1.files_id=fxt${cnt}.files_id";
 730         }
 731         push(@inners, $inner);
 732     }
 733     $sql .= ("\n\t" . join(" ", @crosses)) if(@crosses);
 734     $sql .= ("\n" . join("\n", @inners)) if(@inners);
 735     $sql .= "\n\tWHERE $sqlclause" if($sqlclause);
 736 #    if($tag)
 737 #    {
 738 #       $sql .= " AND t${joinsneeded}.parents_id='$tag'";
 739 #    }
 740     $sql .= "\n\tGROUP BY fxt1.files_id\n";
 741     return $sql;
 742 }
 743
 744 sub sql_start
 745 {
 746     my($self, $tables)=@_;
 747     my $sql="SELECT $tables FROM ";
 748     if($self->{in_all})
 749     {
 750         $sql .= "files\n";
 751     }
 752     else
 753     {
 754         $sql .= ("(\n" .
 755                  $self->tags_subselect() .
 756                  ") AS subselect\n" .
 757                  "INNER JOIN files ON subselect.files_id=files.id\n");
 758     }
 759     return $sql;
 760 }
 761
 762 # we just filter $ALLTRACKS, $NOARTIST and $NOALBUM
 763 # filtering tags properly requires up to four levels of recursion
 764 # (tag/tagval/AND/NOT) and is too slow
 765 sub filter
 766 {
 767     my($self, @dirs)=@_;
 768     return(@dirs) unless($ENABLE_FILTER);
 769     my $base=$self->{path};
 770     my @outdirs=();
 771     for my $dir (@dirs)
 772     {
 773 #       print "\nFILTER (",$self->state(), "): $base / $dir\n";
 774         if($self->empty("$base/$dir"))
 775         {
 776 #           print "empty: $base / $dir\n";
 777         }
 778         else
 779         {
 780 #           print "non-empty, accepting: $base / $dir\n";
 781             push(@outdirs, $dir);
 782         }
 783     }
 784     return(@outdirs);
 785 }
 786
 787 sub empty
 788 {
 789     my($self, $dir)=@_;
 790     my $path=ID3FS::Path->new($self->{db}, $dir, $self->{verbose},
 791                               ($self->{maxtagdepth} - $self->{curtagdepth}));
 792     return 1 unless($path->isvalid());
 793     my($subdirs,$subfiles)=$path->dirents();
 794     return 0 if(@$subfiles || @$subdirs);
 795     return 1;
 796 }
 797
 798 # if path is .../OR/ or .../OR/NOT
 799 sub in_or
 800 {
 801     my($self)=@_;
 802     my $tail=$self->tail();
 803     return 0 unless($tail);
 804     return 0 unless($tail->type() eq "boolean");
 805     return 1 if($tail->name() eq "OR");
 806     return 0 unless($tail->name() eq "NOT");
 807     my $parent=$self->tail_parent();
 808     return 0 unless($parent);
 809     return 0 unless($parent->type() eq "boolean");
 810     return 1 if($parent->name() eq "OR");
 811     return 0;
 812 }
 813
 814 1;