lib/ID3FS/Path.pm

   1 package ID3FS::Path;
   2
   3 use strict;
   4 use warnings;
   5 use ID3FS::PathElement::Artist;
   6 use ID3FS::PathElement::Album;
   7 use ID3FS::PathElement::Boolean;
   8 use ID3FS::PathElement::File;
   9 use ID3FS::PathElement::Tag;
  10 use ID3FS::PathElement::Tagval;
  11 use ID3FS::Path::Node;
  12
  13 our ($STATE_INVALID, $STATE_ROOT, $STATE_TAG, $STATE_TAGVAL,
  14      $STATE_BOOLEAN, $STATE_ALBUMS, $STATE_TRACKLIST,
  15      $STATE_FILE, $STATE_ALL)=(0..8);
  16
  17 our %priorities=( "OR" => 0, "AND" => 1, "NOT" => 2 );
  18
  19 our $PATH_ALLTRACKS="TRACKS";
  20 our $PATH_NOARTIST="NOARTIST";
  21 our $PATH_NOALBUM="NOALBUM";
  22
  23 sub new
  24 {
  25     my $proto=shift;
  26     my $class=ref($proto) || $proto;
  27     my $self={};
  28     bless($self,$class);
  29
  30     $self->{elements}=[];
  31     $self->{db}=shift;
  32     $self->{path}=shift;
  33     $self->{verbose}=shift;
  34     $self->{maxtagdepth}=shift;
  35     $self->{curtagdepth}=0;
  36     $self->{path} =~ s/\/\//\//g; # drop doubled slashes
  37
  38     $self->parse();
  39 #    print "STATE: ", $self->state(), "\n";
  40     return $self;
  41 }
  42
  43 sub isdir
  44 {
  45     my($self)=@_;
  46     if(($self->state() == $STATE_FILE) ||
  47        ($self->state() == $STATE_INVALID))
  48     {
  49         return 0;
  50     }
  51     return 1;
  52 }
  53
  54 sub isfile
  55 {
  56     my($self)=@_;
  57     return($self->state() == $STATE_FILE);
  58 }
  59
  60 sub isvalid
  61 {
  62     my($self)=@_;
  63     return($self->state() != $STATE_INVALID);
  64 }
  65
  66 sub dest
  67 {
  68     my($self, $mountpoint)=@_;
  69     if($self->state() == $STATE_FILE)
  70     {
  71         return $self->filename($mountpoint);
  72     }
  73     return "ERROR"; #should never happen?
  74 }
  75
  76 sub dirents
  77 {
  78     my($self)=@_;
  79     my @dents=();
  80     my @fents=();
  81     my $state=$self->state();
  82 #    print "DIRENTS: STATE: $state\n";
  83 #    print "DIRENTS: FILE: $self->{path}\n";
  84     if($state==$STATE_ALL)
  85     {
  86         @dents=($PATH_ALLTRACKS, $PATH_NOARTIST, $self->artists());
  87     }
  88     elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
  89     {
  90         if($state==$STATE_TAG && $self->at("tag") &&
  91            $self->{db}->tag_has_values($self->tail()->id()))
  92         {
  93             @dents=$self->tags();
  94         }
  95         else
  96         {
  97             if($self->{maxtagdepth} && ($self->{curtagdepth} < $self->{maxtagdepth}))
  98             {
  99                 @dents=qw(AND OR);
 100             }
 101             push(@dents, $self->filter($PATH_ALLTRACKS, $PATH_NOARTIST));
 102             push(@dents, $self->artists());
 103         }
 104     }
 105     elsif($state==$STATE_BOOLEAN)
 106     {
 107         my $parent=$self->tail();
 108         unless($self->is("boolean", $parent) &&
 109                $parent->{name} eq "NOT")
 110         {
 111             @dents=("NOT");
 112         }
 113         push(@dents,$self->tags());
 114     }
 115     elsif($state==$STATE_ROOT)
 116     {
 117         @dents=(qw(ALL NOT), $self->tags());
 118     }
 119     elsif($state==$STATE_ALBUMS)
 120     {
 121         @dents=($self->filter($PATH_ALLTRACKS, $PATH_NOALBUM), $self->albums());
 122     }
 123     elsif($state==$STATE_TRACKLIST)
 124     {
 125         @fents=$self->tracks();
 126     }
 127     else
 128     {
 129         print "DIRENTS: UNHANDLED STATE: $state\n";
 130     }
 131     return(\@dents, \@fents);
 132 }
 133
 134 sub parse
 135 {
 136     my($self)=@_;
 137     @{$self->{components}}=split(/\//, $self->{path});
 138     shift @{$self->{components}}; # drop empty field before leading /
 139 #    print "PATH: $self->{path}\n";
 140     $self->state($STATE_ROOT);
 141     return if($self->{path} eq "/");
 142     my @parts=@{$self->{components}};
 143     my($tag, $tagval);
 144     $self->{elements}=[];
 145     $self->{bare_not}=0;
 146     $self->{in_all}=0;
 147     my $root_not=0;
 148     my $tags_seen=0;
 149     while(defined(my $name=shift @parts))
 150     {
 151 #       print "NAME: $name\n";
 152         my $state=$self->state();
 153         if($state==$STATE_INVALID)
 154         {
 155 #           print "SM: INVALID: $name\n";
 156             return;
 157         }
 158         elsif($state==$STATE_ROOT)
 159         {
 160 #           print "SM: ROOT: $name\n";
 161             if($name eq "ALL")
 162             {
 163                 $self->{in_all}=1;
 164                 $self->state($STATE_ALL);
 165             }
 166             elsif($name eq "NOT")
 167             {
 168                 $root_not=1;
 169                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 170                 $self->state($STATE_BOOLEAN);
 171             }
 172             else
 173             {
 174                 $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 175                 if($tag)
 176                 {
 177                     push(@{$self->{elements}}, $tag);
 178                     $tags_seen++;
 179                     $self->state($STATE_TAG);
 180                 }
 181                 else
 182                 {
 183                     $self->state($STATE_INVALID);
 184                 }
 185             }
 186         }
 187         elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
 188         {
 189             my $tag=$self->tail();
 190 #           print "SM: TAG/TAGVAL($state): $name\n";
 191             if($state==$STATE_TAG && $self->is("tag", $tag) &&
 192                $self->{db}->tag_has_values($tag->id()))
 193             {
 194 #               print "Parsing: parent: $tag->id()\n";
 195                 my $tagval=ID3FS::PathElement::Tag->new($self->{db}, $name, $tag->id());
 196                 if(defined($tagval))
 197                 {
 198                     $self->state($STATE_TAGVAL);
 199                     # stay in tag state
 200                     push(@{$self->{elements}}, $tagval);
 201                 }
 202                 else
 203                 {
 204                     $self->state($STATE_INVALID);
 205                 }
 206             }
 207             elsif($name eq $PATH_ALLTRACKS)
 208             {
 209                 $self->state($STATE_TRACKLIST);
 210             }
 211             elsif($name eq $PATH_NOARTIST)
 212             {
 213                 $self->state($STATE_TRACKLIST);
 214             }
 215             elsif($name eq "AND")
 216             {
 217                 $self->state($STATE_BOOLEAN);
 218                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 219             }
 220             elsif($name eq "OR")
 221             {
 222                 $self->state($STATE_BOOLEAN);
 223                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 224             }
 225             else
 226             {
 227                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 228                 if($artist)
 229                 {
 230                     push(@{$self->{elements}}, $artist);
 231                     $self->state($STATE_ALBUMS);
 232                 }
 233                 else
 234                 {
 235                     $self->state($STATE_INVALID);
 236                 }
 237             }
 238         }
 239         elsif($state==$STATE_BOOLEAN)
 240         {
 241 #           print "SM: BOOLEAN: $name\n";
 242             my $parent=$self->tail();
 243             my $allownot=1;
 244             if($self->is("boolean", $parent) &&
 245                $parent->{name} eq "NOT")
 246             {
 247                 $allownot=0;
 248             }
 249             if($allownot && $name eq "NOT")
 250             {
 251                 $self->state($STATE_BOOLEAN);
 252                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 253             }
 254             else
 255             {
 256                 my $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 257                 if($tag)
 258                 {
 259                     push(@{$self->{elements}}, $tag);
 260                     $tags_seen++;
 261                     $self->state($STATE_TAG);
 262                 }
 263                 else
 264                 {
 265                     $self->state($STATE_INVALID);
 266                 }
 267             }
 268         }
 269         elsif($state==$STATE_ALBUMS)
 270         {
 271 #           print "SM: ALBUM: $name\n";
 272             if($name eq $PATH_ALLTRACKS)
 273             {
 274                 $self->state($STATE_TRACKLIST);
 275             }
 276             elsif($name eq $PATH_NOALBUM)
 277             {
 278                 $self->state($STATE_TRACKLIST);
 279             }
 280             else
 281             {
 282                 my $album=ID3FS::PathElement::Album->new($self->{db}, $name);
 283                 if($album)
 284                 {
 285                     push(@{$self->{elements}}, $album);
 286                     $self->state($STATE_TRACKLIST);
 287                 }
 288                 else
 289                 {
 290                     $self->state($STATE_INVALID);
 291                 }
 292             }
 293         }
 294         elsif($state==$STATE_TRACKLIST)
 295         {
 296 #           print "SM: TRACKLIST: $name\n";
 297             my $track=ID3FS::PathElement::File->new($self->{db}, $name);
 298             if($track)
 299             {
 300                 push(@{$self->{elements}}, $track);
 301                 $self->state($STATE_FILE);
 302             }
 303             else
 304             {
 305                 $self->state($STATE_INVALID);
 306             }
 307         }
 308         elsif($state==$STATE_FILE)
 309         {
 310 #           print "SM: FILE: $name\n";
 311             # Can't have anything after a filename
 312             $self->state($STATE_INVALID);
 313         }
 314         elsif($state==$STATE_ALL)
 315         {
 316             if($name eq $PATH_ALLTRACKS)
 317             {
 318                 $self->state($STATE_TRACKLIST);
 319             }
 320             elsif($name eq $PATH_NOARTIST)
 321             {
 322                 $self->state($STATE_TRACKLIST);
 323             }
 324             else
 325             {
 326                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 327                 if($artist)
 328                 {
 329                     push(@{$self->{elements}}, $artist);
 330                     $self->state($STATE_ALBUMS);
 331                 }
 332                 else
 333                 {
 334                     $self->state($STATE_INVALID);
 335                 }
 336             }
 337         }
 338         else
 339         {
 340             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 341             $self->state($STATE_INVALID);
 342         }
 343     }
 344
 345     if($root_not && ($tags_seen < 2))
 346     {
 347         $self->{bare_not}=1;
 348     }
 349
 350     # remove trailing boolean
 351     my @elements=@{$self->{elements}};
 352     while(@elements && $self->is("boolean", $elements[$#elements]))
 353     {
 354         pop @elements;
 355     }
 356     # sort elements by precedence
 357     @elements=$self->sort_elements(@elements);
 358     $self->{tagtree}=$self->elements_to_tree(\@elements);
 359     if($self->{tagtree})
 360     {
 361         ($self->{sqlconditions},
 362          $self->{joins}) = $self->{tagtree}->to_sql();
 363 #       print "TREE: ",  $self->{tagtree}->print(), "\n";
 364 #       print("SQL CONDITION(", scalar(@{$self->{joins}}), "): ",
 365 #             $self->{sqlconditions}, "\n");
 366 #       use Data::Dumper;
 367 #       print Dumper $self->{tagtree};
 368     }
 369 }
 370
 371 sub state
 372 {
 373     my($self, $newstate)=@_;
 374     if(defined($newstate))
 375     {
 376         $self->{state}=$newstate;
 377         $self->{curtagdepth}++ if($newstate == $STATE_TAG);
 378     }
 379     return $self->{state};
 380 }
 381
 382 sub elements_to_tree
 383 {
 384     my($self, $elements)=@_;
 385     return undef unless(@$elements);
 386     my ($left, $right, $op)=(undef, undef, undef);
 387     my $thing=pop @$elements;
 388     if($self->is("boolean", $thing))
 389     {
 390         my $op=$thing;
 391         $right=$self->elements_to_tree($elements);
 392         if($op->{name} ne "NOT")
 393         {
 394             $left=$self->elements_to_tree($elements);
 395         }
 396         return ID3FS::Path::Node->new($left, $op, $right);
 397     }
 398     else
 399     {
 400         return ID3FS::Path::Node->new($thing);
 401     }
 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     my $ref=ref($thing);
 497     my $typestr="ID3FS::PathElement::" . ucfirst($type);
 498     return 1 if($ref eq $typestr);
 499     return 0;
 500 }
 501
 502 # the one before last
 503 sub tail_parent
 504 {
 505     my($self)=@_;
 506     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 507 }
 508
 509 ######################################################################
 510
 511 sub tags
 512 {
 513     my($self)=@_;
 514     if(!$self->{tagtree}) # / or /NOT
 515     {
 516         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 517         return($self->{db}->cmd_firstcol($sql));
 518     }
 519     my $hasvals=$self->expecting_values();
 520     my $parent=$self->trailing_tag_parent();
 521 #    print "THASVALS: $hasvals\n";
 522 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 523     my @ids=();
 524     my $sql=("SELECT tags.name FROM (\n" .
 525              $self->tags_subselect() .
 526              ") AS subselect\n" .
 527              "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n" .
 528              "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n");
 529     my @allused=$self->used_tags();
 530     my @used=grep { ref($_) ne "ARRAY"; } @allused;
 531     my @used_with_vals=grep { ref($_) eq "ARRAY"; } @allused;
 532 #    print "tags(): USED: ", join(", ", @used), "\n";
 533 #    print "tags(): USED_WITH_VALS: ", join(", ", map { "[".$_->[0]. ", ".$_->[1]."]";} @used_with_vals), "\n";
 534     my @orclauses=();
 535     my @andclauses=();
 536     my $id=$self->trailing_tag_id();
 537     if($hasvals)
 538     {
 539 #       print "HAS_VALUES\n";
 540         my @values=map { "'".$_->[1]."'"; } grep { $_->[0] == $id; } @used_with_vals;
 541         my $clause="(tags.parents_id='$id'";
 542         if(@values)
 543         {
 544             $clause .= " AND tags.id NOT IN (" . join(', ', @values) . ")";
 545         }
 546         $clause .= ")";
 547         push(@andclauses, $clause);
 548     }
 549     else
 550     {
 551 #       print "HASNT VALUES\n";;
 552         if(@used)
 553         {
 554             push(@andclauses, "(NOT (tags.parents_id='' AND tags.id IN (" . join(', ', @used) . ")))");
 555         }
 556         for my $pair (@used_with_vals)
 557         {
 558             push(@andclauses, "(NOT (tags.parents_id='" . $pair->[0] . "' AND tags.id='" . $pair->[1] . "'))");
 559         }
 560     }
 561
 562     my $parentclause= "(tags.parents_id='";
 563     if($hasvals)
 564     {
 565         $parentclause .= $id;
 566     }
 567     elsif($parent)
 568     {
 569         $parentclause .= $parent;
 570     }
 571     $parentclause .= "')";
 572     push(@andclauses, $parentclause);
 573
 574     if(@orclauses)
 575     {
 576         push(@andclauses, '( ' . join(' OR ', @orclauses) . ' )');
 577     }
 578     if(@andclauses)
 579     {
 580         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 581     }
 582     $sql .= "GROUP BY tags.name;";
 583     print "SQL(TAGS): $sql\n" if($self->{verbose});
 584     my @tagnames=$self->{db}->cmd_firstcol($sql);
 585     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 586     return(@tagnames);
 587 }
 588
 589 sub artists
 590 {
 591     my($self)=@_;
 592     if(!@{$self->{elements}}) # /ALL
 593     {
 594         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 595         return($self->{db}->cmd_firstcol($sql));
 596     }
 597     my @ids=();
 598     my $sql=$self->sql_start("artists.name");
 599     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 600              "WHERE artists.name != ''\n" .
 601              "GROUP BY artists.name;");
 602     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 603     my @tagnames=$self->{db}->cmd_firstcol($sql);
 604     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 605     return(@tagnames);
 606 }
 607
 608 sub albums
 609 {
 610     my($self)=@_;
 611     my @ids=();
 612     my $tail=$self->tail();
 613     # FIXME: rework PathElements
 614     if($self->is("artist", $tail))
 615     {
 616         return $self->artist_albums($tail->id());
 617     }
 618     my $sql=$self->sql_start("albums.name");
 619     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 620              "WHERE albums.name != ''\n" .
 621              "GROUP BY albums.name;");
 622     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 623     my @names=$self->{db}->cmd_firstcol($sql);
 624     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 625     return(@names);
 626 }
 627
 628 sub artist_albums
 629 {
 630     my($self, $artist_id)=@_;
 631     my $sql=$self->sql_start("albums.name");
 632     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 633              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 634              "WHERE artists.id=? and albums.name <> ''\n" .
 635              "GROUP BY albums.name\n");
 636     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 637     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 638     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 639     return(@albums);
 640 }
 641
 642 sub artist_tracks
 643 {
 644     my($self, $artist_id)=@_;
 645     my $sql=$self->sql_start("files.name");
 646     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 647              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 648              "WHERE artists.id=? AND albums.name=''\n" .
 649              "GROUP BY files.name\n");
 650     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 651     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 652     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 653     return(@names);
 654 }
 655
 656 sub album_tracks
 657 {
 658     my($self, $artist_id, $album_id)=@_;
 659     my $sql=("SELECT files.name FROM files\n" .
 660              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 661              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 662              "WHERE artists.id=? AND albums.id=?\n" .
 663              "GROUP BY files.name\n");
 664     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 665     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 666     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 667     return(@names);
 668 }
 669
 670 sub tracks
 671 {
 672     my($self)=@_;
 673     # FIXME: rework PathElements
 674     my $tail=$self->tail();
 675     if($self->is("artist", $tail))
 676     {
 677         return $self->artist_tracks($tail->id());
 678     }
 679     elsif($self->is("album", $tail))
 680     {
 681         my $artist_id=0;
 682         my $artist=$self->tail_parent();
 683         if($self->is("artist", $artist))
 684         {
 685             # should always happen
 686             $artist_id=$artist->id();
 687         }
 688         return $self->album_tracks($artist_id, $tail->id());
 689     }
 690     my $sql=$self->sql_start("files.name");
 691     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 692     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 693     {
 694         $sql .= "WHERE artists.name =''\n";
 695     }
 696     $sql .= "GROUP BY files.name;";
 697     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 698     my @names=$self->{db}->cmd_firstcol($sql);
 699     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 700     return(@names);
 701 }
 702
 703 sub filename
 704 {
 705     my($self, $mountpoint)=@_;
 706     my $tail=$self->tail();
 707     if($self->is("file", $tail))
 708     {
 709         my $id=$tail->id();
 710         my $sql=("SELECT paths.name, files.name FROM files\n" .
 711                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 712                  "WHERE files.id=?\n" .
 713                  "GROUP BY paths.name, files.name");
 714         print "FILENAME SQL: $sql\n" if($self->{verbose});
 715         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 716         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 717         return($self->{db}->relativise($path, $name, $mountpoint));
 718     }
 719     # should never happen
 720     return "ERROR";
 721 }
 722
 723 sub tags_subselect
 724 {
 725     my($self)=@_;
 726     my $hasvals=$self->expecting_values();
 727     # we need to specially handle a bare /NOT/tag with no other clauses,
 728     # using a simple WHERE id !='tagid' instead of a LEFT JOIN
 729     if($self->{bare_not})
 730     {
 731         return $self->bare_not_subselect();
 732     }
 733     if($self->{in_all})
 734     {
 735         return "\tSELECT id FROM files AS files_id\n";
 736     }
 737     my $tree=$self->{tagtree};
 738     my $parent=$self->trailing_tag_parent();
 739
 740 #    print "ELEMENTS: ", join('/', map { $_->{name}; } @{$self->{elements}}), "\n";
 741 #    print "TREE: ", $tree->print(), "\n";
 742     my $tag=undef;
 743     if($hasvals)
 744     {
 745         $tag=$self->trailing_tag_id();
 746 #       print "Trailing id: $tag\n";
 747     }
 748     my ($sqlclause, @joins)=(undef, ());
 749     ($sqlclause, @joins) = $tree->to_sql($hasvals) if($tree);
 750 #    print "SQL(" . scalar(@joins) .": $sqlclause\n";
 751     my $sql="\tSELECT fxt1.files_id FROM tags t1";
 752     my @crosses=();
 753     my @inners=();
 754 #    $joinsneeded++ if($tag);
 755     for(my $i=0; $i <= $#joins; $i++)
 756     {
 757         my $cnt=$i+1;
 758         my $join=$joins[$i];
 759         my $inner=("\t$join JOIN files_x_tags fxt$cnt ON " .
 760                    "t${cnt}.id=fxt${cnt}.tags_id");
 761         if($i > 0)
 762         {
 763             push(@crosses, "CROSS JOIN tags t$cnt");
 764             $inner .= " AND fxt1.files_id=fxt${cnt}.files_id";
 765         }
 766         push(@inners, $inner);
 767     }
 768     $sql .= ("\n\t" . join(" ", @crosses)) if(@crosses);
 769     $sql .= ("\n" . join("\n", @inners)) if(@inners);
 770     $sql .= "\n\tWHERE $sqlclause" if($sqlclause);
 771 #    if($tag)
 772 #    {
 773 #       $sql .= " AND t${joinsneeded}.parents_id='$tag'";
 774 #    }
 775     $sql .= "\n\tGROUP BY fxt1.files_id\n";
 776     return $sql;
 777 }
 778
 779 sub bare_not_subselect
 780 {
 781     my($self)=@_;
 782     my @tags=grep { $self->is("tag", $_); } @{$self->{elements}};
 783     my $sql=("\tSELECT f1.id AS files_id FROM files f1 WHERE f1.id NOT IN (\n" .
 784              "\t\tSELECT fxt1.files_id FROM tags t1\n" .
 785              "\t\tINNER JOIN files_x_tags fxt1 ON t1.id=fxt1.tags_id\n" .
 786              "\t\tWHERE ");
 787     if(scalar(@tags) > 1)
 788     {
 789         $sql .= ("(t1.parents_id='" . $tags[0]->id() . "' AND t1.id='" .
 790                  $tags[1]->id() . "')");
 791     }
 792     else
 793     {
 794         $sql .= ("(t1.parents_id='' AND t1.id='" . $tags[0]->id() . "')");
 795     }
 796     $sql .= "\n\t\tGROUP BY fxt1.files_id\n\t)\n";
 797     return($sql);
 798 }
 799
 800 sub sql_start
 801 {
 802     my($self, $tables)=@_;
 803     my $sql="SELECT $tables FROM ";
 804     if($self->{in_all})
 805     {
 806         $sql .= "files\n";
 807     }
 808     else
 809     {
 810         $sql .= ("(\n" .
 811                  $self->tags_subselect() .
 812                  ") AS subselect\n" .
 813                  "INNER JOIN files ON subselect.files_id=files.id\n");
 814     }
 815     return $sql;
 816 }
 817
 818
 819 sub constraints_tag_list
 820 {
 821     my($self, @constraints)=@_;
 822     my $lasttag=undef;
 823     my @tags=();
 824     my @tags_vals=();
 825     for my $constraint (@constraints)
 826     {
 827 #       print ref($constraint), ": ", $constraint->{name}, "\n";
 828         if($self->is("tag", $constraint))
 829         {
 830             if(defined($lasttag))
 831             {
 832 #               print "TAGVAL\n";
 833                 push(@tags_vals, [$lasttag, $constraint->id()]) if defined($constraint->id());
 834                 $lasttag=undef;
 835             }
 836             elsif($self->tag_has_values($constraint->id()))
 837             {
 838 #               print "HASVALUES\n";
 839                 $lasttag=$constraint->id() if defined($constraint->id());
 840             }
 841             else
 842             {
 843 #               print "NOVALUES\n";
 844                 push(@tags, $constraint->id()) if(defined($constraint->id()));
 845             }
 846         }
 847     }
 848     @tags=map{ "\"$_\""; } @tags;
 849     @tags_vals=map( { [ map({ "\"$_\""; } @$_ ) ] } @tags_vals);
 850     $lasttag="\"$lasttag\"" if defined($lasttag);
 851     return(\@tags, \@tags_vals, $lasttag);
 852 }
 853
 854 # we just filter $ALLTRACKS, $NOARTIST and $NOALBUM
 855 # filtering tags properly requires up to four levels of recursion
 856 # (tag/tagval/AND/NOT) and is too slow
 857 sub filter
 858 {
 859     my($self, @dirs)=@_;
 860     my $base=$self->{path};
 861     my @outdirs=();
 862     for my $dir (@dirs)
 863     {
 864         print "\nFILTER (",$self->state(), "): $base / $dir\n";
 865         if($self->empty("$base/$dir"))
 866         {
 867             print "empty: $base / $dir\n";
 868         }
 869         else
 870         {
 871             print "non-empty, accepting: $base / $dir\n";
 872             push(@outdirs, $dir);
 873         }
 874     }
 875     return(@outdirs);
 876 }
 877
 878 sub empty
 879 {
 880     my($self, $dir)=@_;
 881     my $path=ID3FS::Path->new($self->{db}, $dir, $self->{verbose},
 882                               ($self->{maxtagdepth} - $self->{curtagdepth}));
 883     return 1 unless($path->isvalid());
 884     my($subdirs,$subfiles)=$path->dirents();
 885     return 0 if(@$subfiles || @$subdirs);
 886     return 1;
 887 }
 888
 889 1;