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 #       print "TREE: ",  $self->{tagtree}->print(), "\n";
 358 #       print("SQL CONDITION(", scalar(@{$self->{joins}}), "): ",
 359 #             $self->{sqlconditions}, "\n");
 360 #       use Data::Dumper;
 361 #       print Dumper $self->{tagtree};
 362     }
 363 }
 364
 365 sub state
 366 {
 367     my($self, $newstate)=@_;
 368     if(defined($newstate))
 369     {
 370         $self->{state}=$newstate;
 371         $self->{curtagdepth}++ if($newstate == $STATE_TAG);
 372     }
 373     return $self->{state};
 374 }
 375
 376 sub elements_to_tree
 377 {
 378     my($self, $elements)=@_;
 379     return undef unless(@$elements);
 380     my ($left, $right, $op)=(undef, undef, undef);
 381     my $thing=pop @$elements;
 382     if($self->is("boolean", $thing))
 383     {
 384         $right=$self->elements_to_tree($elements);
 385         if($thing->{name} ne "NOT")
 386         {
 387             $left=$self->elements_to_tree($elements);
 388         }
 389         $thing->left($left);
 390         $thing->right($right);
 391     }
 392     return $thing;
 393 }
 394
 395 # Dijkstra's shunting-yard algorithm
 396 sub sort_elements
 397 {
 398     my ($self, @input)=@_;
 399     my @opstack=();
 400     my @output=();
 401 #    print "INPUT: ", join(', ', map { $_->{name}; } @input), "\n";
 402     while(my $thing = shift @input)
 403     {
 404         if($self->is("tag", $thing))
 405         {
 406             # Handle tag values by dropping parent
 407             if(@input && $self->is("tag", $input[0]))
 408             {
 409                 $thing=shift @input;
 410             }
 411             push(@output, $thing);
 412         }
 413         elsif($self->is("boolean", $thing))
 414         {
 415             # bool
 416             while(@opstack &&
 417                   ($priorities{$thing->{name}} <= $priorities{$opstack[$#opstack]->{name}}))
 418             {
 419                 push(@output, pop(@opstack));
 420             }
 421             push(@opstack, $thing);
 422         }
 423     }
 424     while(@opstack)
 425     {
 426         push(@output, pop(@opstack));
 427     }
 428 #    print "STACK: ", join(', ', map { $_->{name}; } @output), "\n";
 429     return @output;
 430 }
 431
 432 sub used_tags
 433 {
 434     my($self)=@_;
 435     return() unless(defined($self->{tagtree}));
 436     return($self->{tagtree}->used_tags());
 437 }
 438
 439 sub expecting_values
 440 {
 441     my($self)=@_;
 442     my $tail=$self->tail();
 443     if($self->is("tag", $tail))
 444     {
 445         return($self->{db}->tag_has_values($tail->id()));
 446     }
 447 }
 448
 449 sub trailing_tag_id
 450 {
 451     my($self)=@_;
 452     my $tail=$self->tail();
 453     if($self->is("tag", $tail))
 454     {
 455         return($tail->id());
 456     }
 457     return undef;
 458 }
 459
 460 sub trailing_tag_parent
 461 {
 462     my($self)=@_;
 463     my $tail=$self->tail();
 464     if($self->is("tag", $tail))
 465     {
 466         return($tail->{parents_id});
 467     }
 468     return undef;
 469 }
 470
 471 sub tail
 472 {
 473     my($self)=@_;
 474     return($self->{elements}->[$#{$self->{elements}}]);
 475 }
 476
 477 sub at
 478 {
 479     my($self, $type)=@_;
 480     return($self->is($type, $self->tail()));
 481 }
 482
 483 sub is
 484 {
 485     my($self, $type, $thing)=@_;
 486     return 0 unless($thing);
 487     return 0 unless($thing->type());
 488     return 1 if($type eq $thing->type());
 489     return 0;
 490 }
 491
 492 # the one before last
 493 sub tail_parent
 494 {
 495     my($self)=@_;
 496     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 497 }
 498
 499 ######################################################################
 500
 501 sub tags
 502 {
 503     my($self)=@_;
 504     if(!$self->{tagtree}) # / or /NOT
 505     {
 506         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 507         return($self->{db}->cmd_firstcol($sql));
 508     }
 509     my $hasvals=$self->expecting_values();
 510     my $parent=$self->trailing_tag_parent();
 511 #    print "THASVALS: $hasvals\n";
 512 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 513     my @ids=();
 514     my $sql=("SELECT tags.name FROM (\n" .
 515              $self->tags_subselect() .
 516              ") AS subselect\n" .
 517              "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n" .
 518              "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n");
 519     my @allused=$self->used_tags();
 520     my @used=grep { ref($_) ne "ARRAY"; } @allused;
 521     my @used_with_vals=grep { ref($_) eq "ARRAY"; } @allused;
 522 #    print "tags(): USED: ", join(", ", @used), "\n";
 523 #    print "tags(): USED_WITH_VALS: ", join(", ", map { "[".$_->[0]. ", ".$_->[1]."]";} @used_with_vals), "\n";
 524     my @orclauses=();
 525     my @andclauses=();
 526     my $id=$self->trailing_tag_id();
 527     if($hasvals)
 528     {
 529 #       print "HAS_VALUES\n";
 530         my @values=map { "'".$_->[1]."'"; } grep { $_->[0] == $id; } @used_with_vals;
 531         my $clause="(tags.parents_id='$id'";
 532         if(@values)
 533         {
 534             $clause .= " AND tags.id NOT IN (" . join(', ', @values) . ")";
 535         }
 536         $clause .= ")";
 537         push(@andclauses, $clause);
 538     }
 539     else
 540     {
 541 #       print "HASNT VALUES\n";;
 542         if(@used)
 543         {
 544             push(@andclauses, "(NOT (tags.parents_id='' AND tags.id IN (" . join(', ', @used) . ")))");
 545         }
 546         for my $pair (@used_with_vals)
 547         {
 548             push(@andclauses, "(NOT (tags.parents_id='" . $pair->[0] . "' AND tags.id='" . $pair->[1] . "'))");
 549         }
 550     }
 551
 552     my $parentclause= "(tags.parents_id='";
 553     if($hasvals)
 554     {
 555         $parentclause .= $id;
 556     }
 557     elsif($parent)
 558     {
 559         $parentclause .= $parent;
 560     }
 561     $parentclause .= "')";
 562     push(@andclauses, $parentclause);
 563
 564     if(@orclauses)
 565     {
 566         push(@andclauses, '( ' . join(' OR ', @orclauses) . ' )');
 567     }
 568     if(@andclauses)
 569     {
 570         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 571     }
 572     $sql .= "GROUP BY tags.name;";
 573     print "SQL(TAGS): $sql\n" if($self->{verbose});
 574     my @tagnames=$self->{db}->cmd_firstcol($sql);
 575     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 576     return(@tagnames);
 577 }
 578
 579 sub artists
 580 {
 581     my($self)=@_;
 582     if(!@{$self->{elements}}) # /ALL
 583     {
 584         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 585         return($self->{db}->cmd_firstcol($sql));
 586     }
 587     my @ids=();
 588     my $sql=$self->sql_start("artists.name");
 589     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 590              "WHERE artists.name != ''\n" .
 591              "GROUP BY artists.name;");
 592     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 593     my @tagnames=$self->{db}->cmd_firstcol($sql);
 594     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 595     return(@tagnames);
 596 }
 597
 598 sub albums
 599 {
 600     my($self)=@_;
 601     my @ids=();
 602     my $tail=$self->tail();
 603     if($self->is("artist", $tail))
 604     {
 605         return $self->artist_albums($tail->id());
 606     }
 607     my $sql=$self->sql_start("albums.name");
 608     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 609              "WHERE albums.name != ''\n" .
 610              "GROUP BY albums.name;");
 611     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 612     my @names=$self->{db}->cmd_firstcol($sql);
 613     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 614     return(@names);
 615 }
 616
 617 sub artist_albums
 618 {
 619     my($self, $artist_id)=@_;
 620     my $sql=$self->sql_start("albums.name");
 621     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 622              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 623              "WHERE artists.id=? and albums.name <> ''\n" .
 624              "GROUP BY albums.name\n");
 625     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 626     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 627     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 628     return(@albums);
 629 }
 630
 631 sub artist_tracks
 632 {
 633     my($self, $artist_id)=@_;
 634     my $sql=$self->sql_start("files.name");
 635     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 636              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 637              "WHERE artists.id=? AND albums.name=''\n" .
 638              "GROUP BY files.name\n");
 639     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 640     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 641     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 642     return(@names);
 643 }
 644
 645 sub album_tracks
 646 {
 647     my($self, $artist_id, $album_id)=@_;
 648     my $sql=("SELECT files.name FROM files\n" .
 649              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 650              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 651              "WHERE artists.id=? AND albums.id=?\n" .
 652              "GROUP BY files.name\n");
 653     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 654     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 655     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 656     return(@names);
 657 }
 658
 659 sub tracks
 660 {
 661     my($self)=@_;
 662     my $tail=$self->tail();
 663     if($self->is("artist", $tail))
 664     {
 665         return $self->artist_tracks($tail->id());
 666     }
 667     elsif($self->is("album", $tail))
 668     {
 669         my $artist_id=0;
 670         my $artist=$self->tail_parent();
 671         if($self->is("artist", $artist))
 672         {
 673             # should always happen
 674             $artist_id=$artist->id();
 675         }
 676         return $self->album_tracks($artist_id, $tail->id());
 677     }
 678     my $sql=$self->sql_start("files.name");
 679     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 680     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 681     {
 682         $sql .= "WHERE artists.name =''\n";
 683     }
 684     $sql .= "GROUP BY files.name;";
 685     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 686     my @names=$self->{db}->cmd_firstcol($sql);
 687     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 688     return(@names);
 689 }
 690
 691 sub filename
 692 {
 693     my($self, $mountpoint)=@_;
 694     my $tail=$self->tail();
 695     if($self->is("file", $tail))
 696     {
 697         my $id=$tail->id();
 698         my $sql=("SELECT paths.name, files.name FROM files\n" .
 699                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 700                  "WHERE files.id=?\n" .
 701                  "GROUP BY paths.name, files.name");
 702         print "FILENAME SQL: $sql\n" if($self->{verbose});
 703         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 704         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 705         return($self->{db}->relativise($path, $name, $mountpoint));
 706     }
 707     # should never happen
 708     return "ERROR";
 709 }
 710
 711 sub tags_subselect
 712 {
 713     my($self)=@_;
 714     my $hasvals=$self->expecting_values();
 715     # we need to specially handle a bare /NOT/tag with no other clauses,
 716     # using a simple WHERE id !='tagid' instead of a LEFT JOIN
 717     if($self->{bare_not})
 718     {
 719         return $self->bare_not_subselect();
 720     }
 721     if($self->{in_all})
 722     {
 723         return "\tSELECT id FROM files AS files_id\n";
 724     }
 725     my $tree=$self->{tagtree};
 726     print "UNDEF!!\n" unless($self->{tagtree});
 727     use Data::Dumper;
 728     print Dumper $tree;
 729     my $parent=$self->trailing_tag_parent();
 730
 731 #    print "ELEMENTS: ", join('/', map { $_->{name}; } @{$self->{elements}}), "\n";
 732 #    print "TREE: ", $tree->print(), "\n";
 733     my $tag=undef;
 734     if($hasvals)
 735     {
 736         $tag=$self->trailing_tag_id();
 737 #       print "Trailing id: $tag\n";
 738     }
 739     my ($sqlclause, @joins)=(undef, ());
 740     ($sqlclause, @joins) = $tree->to_sql($hasvals) if($tree);
 741 #    print "SQL(" . scalar(@joins) .": $sqlclause\n";
 742     my $sql="\tSELECT fxt1.files_id FROM tags t1";
 743     my @crosses=();
 744     my @inners=();
 745 #    $joinsneeded++ if($tag);
 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 #    if($tag)
 763 #    {
 764 #       $sql .= " AND t${joinsneeded}.parents_id='$tag'";
 765 #    }
 766     $sql .= "\n\tGROUP BY fxt1.files_id\n";
 767     return $sql;
 768 }
 769
 770 sub bare_not_subselect
 771 {
 772     my($self)=@_;
 773     my @tags=grep { $self->is("tag", $_); } @{$self->{elements}};
 774     my $sql=("\tSELECT f1.id AS files_id FROM files f1 WHERE f1.id NOT IN (\n" .
 775              "\t\tSELECT fxt1.files_id FROM tags t1\n" .
 776              "\t\tINNER JOIN files_x_tags fxt1 ON t1.id=fxt1.tags_id\n" .
 777              "\t\tWHERE ");
 778     if(scalar(@tags) > 1)
 779     {
 780         $sql .= ("(t1.parents_id='" . $tags[0]->id() . "' AND t1.id='" .
 781                  $tags[1]->id() . "')");
 782     }
 783     else
 784     {
 785         $sql .= ("(t1.parents_id='' AND t1.id='" . $tags[0]->id() . "')");
 786     }
 787     $sql .= "\n\t\tGROUP BY fxt1.files_id\n\t)\n";
 788     return($sql);
 789 }
 790
 791 sub sql_start
 792 {
 793     my($self, $tables)=@_;
 794     my $sql="SELECT $tables FROM ";
 795     if($self->{in_all})
 796     {
 797         $sql .= "files\n";
 798     }
 799     else
 800     {
 801         $sql .= ("(\n" .
 802                  $self->tags_subselect() .
 803                  ") AS subselect\n" .
 804                  "INNER JOIN files ON subselect.files_id=files.id\n");
 805     }
 806     return $sql;
 807 }
 808
 809
 810 sub constraints_tag_list
 811 {
 812     my($self, @constraints)=@_;
 813     my $lasttag=undef;
 814     my @tags=();
 815     my @tags_vals=();
 816     for my $constraint (@constraints)
 817     {
 818 #       print ref($constraint), ": ", $constraint->{name}, "\n";
 819         if($self->is("tag", $constraint))
 820         {
 821             if(defined($lasttag))
 822             {
 823 #               print "TAGVAL\n";
 824                 push(@tags_vals, [$lasttag, $constraint->id()]) if defined($constraint->id());
 825                 $lasttag=undef;
 826             }
 827             elsif($self->tag_has_values($constraint->id()))
 828             {
 829 #               print "HASVALUES\n";
 830                 $lasttag=$constraint->id() if defined($constraint->id());
 831             }
 832             else
 833             {
 834 #               print "NOVALUES\n";
 835                 push(@tags, $constraint->id()) if(defined($constraint->id()));
 836             }
 837         }
 838     }
 839     @tags=map{ "\"$_\""; } @tags;
 840     @tags_vals=map( { [ map({ "\"$_\""; } @$_ ) ] } @tags_vals);
 841     $lasttag="\"$lasttag\"" if defined($lasttag);
 842     return(\@tags, \@tags_vals, $lasttag);
 843 }
 844
 845 # we just filter $ALLTRACKS, $NOARTIST and $NOALBUM
 846 # filtering tags properly requires up to four levels of recursion
 847 # (tag/tagval/AND/NOT) and is too slow
 848 sub filter
 849 {
 850     my($self, @dirs)=@_;
 851     my $base=$self->{path};
 852     my @outdirs=();
 853     for my $dir (@dirs)
 854     {
 855         print "\nFILTER (",$self->state(), "): $base / $dir\n";
 856         if($self->empty("$base/$dir"))
 857         {
 858             print "empty: $base / $dir\n";
 859         }
 860         else
 861         {
 862             print "non-empty, accepting: $base / $dir\n";
 863             push(@outdirs, $dir);
 864         }
 865     }
 866     return(@outdirs);
 867 }
 868
 869 sub empty
 870 {
 871     my($self, $dir)=@_;
 872     my $path=ID3FS::Path->new($self->{db}, $dir, $self->{verbose},
 873                               ($self->{maxtagdepth} - $self->{curtagdepth}));
 874     return 1 unless($path->isvalid());
 875     my($subdirs,$subfiles)=$path->dirents();
 876     return 0 if(@$subfiles || @$subdirs);
 877     return 1;
 878 }
 879
 880 1;