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         my $tag=$self->tail();
  91         if($state==$STATE_TAG &&
  92            defined($tag) &&
  93            ref($tag) eq "ID3FS::PathElement::Tag" &&
  94            $self->{db}->tag_has_values($tag->{id}))
  95         {
  96             @dents=$self->tags();
  97         }
  98         else
  99         {
 100             if($self->{maxtagdepth} && ($self->{curtagdepth} < $self->{maxtagdepth}))
 101             {
 102                 @dents=qw(AND OR);
 103             }
 104             push(@dents, $self->filter($PATH_ALLTRACKS, $PATH_NOARTIST));
 105             push(@dents, $self->artists());
 106         }
 107     }
 108     elsif($state==$STATE_BOOLEAN)
 109     {
 110         my $parent=$self->tail();
 111         unless(defined($parent) &&
 112                ref($parent) eq "ID3FS::PathElement::Boolean" &&
 113                $parent->{name} eq "NOT")
 114         {
 115             @dents=("NOT");
 116         }
 117         push(@dents,$self->tags());
 118     }
 119     elsif($state==$STATE_ROOT)
 120     {
 121         @dents=(qw(ALL NOT), $self->tags());
 122     }
 123     elsif($state==$STATE_ALBUMS)
 124     {
 125         @dents=($self->filter($PATH_ALLTRACKS, $PATH_NOALBUM), $self->albums());
 126     }
 127     elsif($state==$STATE_TRACKLIST)
 128     {
 129         @fents=$self->tracks();
 130     }
 131     else
 132     {
 133         print "DIRENTS: UNHANDLED STATE: $state\n";
 134     }
 135     return(\@dents, \@fents);
 136 }
 137
 138 sub parse
 139 {
 140     my($self)=@_;
 141     @{$self->{components}}=split(/\//, $self->{path});
 142     shift @{$self->{components}}; # drop empty field before leading /
 143 #    print "PATH: $self->{path}\n";
 144     $self->state($STATE_ROOT);
 145     return if($self->{path} eq "/");
 146     my @parts=@{$self->{components}};
 147     my($tag, $tagval);
 148     $self->{elements}=[];
 149     $self->{bare_not}=0;
 150     $self->{in_all}=0;
 151     my $root_not=0;
 152     my $tags_seen=0;
 153     while(defined(my $name=shift @parts))
 154     {
 155 #       print "NAME: $name\n";
 156         my $state=$self->state();
 157         if($state==$STATE_INVALID)
 158         {
 159 #           print "SM: INVALID: $name\n";
 160             return;
 161         }
 162         elsif($state==$STATE_ROOT)
 163         {
 164 #           print "SM: ROOT: $name\n";
 165             if($name eq "ALL")
 166             {
 167                 $self->{in_all}=1;
 168                 $self->state($STATE_ALL);
 169             }
 170             elsif($name eq "NOT")
 171             {
 172                 $root_not=1;
 173                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 174                 $self->state($STATE_BOOLEAN);
 175             }
 176             else
 177             {
 178                 $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 179                 if($tag)
 180                 {
 181                     push(@{$self->{elements}}, $tag);
 182                     $tags_seen++;
 183                     $self->state($STATE_TAG);
 184                 }
 185                 else
 186                 {
 187                     $self->state($STATE_INVALID);
 188                 }
 189             }
 190         }
 191         elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
 192         {
 193 #           print "SM: TAG/TAGVAL($state): $name\n";
 194             my $tag=$self->tail();
 195             if($state==$STATE_TAG &&
 196                defined($tag) &&
 197                ref($tag) eq "ID3FS::PathElement::Tag" &&
 198                $self->{db}->tag_has_values($tag->{id}))
 199             {
 200 #               print "Parsing: parent: $tag->{id}\n";
 201                 my $tagval=ID3FS::PathElement::Tag->new($self->{db}, $name, $tag->{id});
 202                 if(defined($tagval))
 203                 {
 204                     $self->state($STATE_TAGVAL);
 205                     # stay in tag state
 206                     push(@{$self->{elements}}, $tagval);
 207                 }
 208                 else
 209                 {
 210                     $self->state($STATE_INVALID);
 211                 }
 212             }
 213             elsif($name eq $PATH_ALLTRACKS)
 214             {
 215                 $self->state($STATE_TRACKLIST);
 216             }
 217             elsif($name eq $PATH_NOARTIST)
 218             {
 219                 $self->state($STATE_TRACKLIST);
 220             }
 221             elsif($name eq "AND")
 222             {
 223                 $self->state($STATE_BOOLEAN);
 224                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 225             }
 226             elsif($name eq "OR")
 227             {
 228                 $self->state($STATE_BOOLEAN);
 229                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 230             }
 231             else
 232             {
 233                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 234                 if($artist)
 235                 {
 236                     push(@{$self->{elements}}, $artist);
 237                     $self->state($STATE_ALBUMS);
 238                 }
 239                 else
 240                 {
 241                     $self->state($STATE_INVALID);
 242                 }
 243             }
 244         }
 245         elsif($state==$STATE_BOOLEAN)
 246         {
 247 #           print "SM: BOOLEAN: $name\n";
 248             my $parent=$self->tail();
 249             my $allownot=1;
 250             if(defined($parent) &&
 251                ref($parent) eq "ID3FS::PathElement::Boolean" &&
 252                $parent->{name} eq "NOT")
 253             {
 254                 $allownot=0;
 255             }
 256             if($allownot && $name eq "NOT")
 257             {
 258                 $self->state($STATE_BOOLEAN);
 259                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 260             }
 261             else
 262             {
 263                 my $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 264                 if($tag)
 265                 {
 266                     push(@{$self->{elements}}, $tag);
 267                     $tags_seen++;
 268                     $self->state($STATE_TAG);
 269                 }
 270                 else
 271                 {
 272                     $self->state($STATE_INVALID);
 273                 }
 274             }
 275         }
 276         elsif($state==$STATE_ALBUMS)
 277         {
 278 #           print "SM: ALBUM: $name\n";
 279             if($name eq $PATH_ALLTRACKS)
 280             {
 281                 $self->state($STATE_TRACKLIST);
 282             }
 283             elsif($name eq $PATH_NOALBUM)
 284             {
 285                 $self->state($STATE_TRACKLIST);
 286             }
 287             else
 288             {
 289                 my $album=ID3FS::PathElement::Album->new($self->{db}, $name);
 290                 if($album)
 291                 {
 292                     push(@{$self->{elements}}, $album);
 293                     $self->state($STATE_TRACKLIST);
 294                 }
 295                 else
 296                 {
 297                     $self->state($STATE_INVALID);
 298                 }
 299             }
 300         }
 301         elsif($state==$STATE_TRACKLIST)
 302         {
 303 #           print "SM: TRACKLIST: $name\n";
 304             my $track=ID3FS::PathElement::File->new($self->{db}, $name);
 305             if($track)
 306             {
 307                 push(@{$self->{elements}}, $track);
 308                 $self->state($STATE_FILE);
 309             }
 310             else
 311             {
 312                 $self->state($STATE_INVALID);
 313             }
 314         }
 315         elsif($state==$STATE_FILE)
 316         {
 317 #           print "SM: FILE: $name\n";
 318             # Can't have anything after a filename
 319             $self->state($STATE_INVALID);
 320         }
 321         elsif($state==$STATE_ALL)
 322         {
 323             if($name eq $PATH_ALLTRACKS)
 324             {
 325                 $self->state($STATE_TRACKLIST);
 326             }
 327             elsif($name eq $PATH_NOARTIST)
 328             {
 329                 $self->state($STATE_TRACKLIST);
 330             }
 331             else
 332             {
 333                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 334                 if($artist)
 335                 {
 336                     push(@{$self->{elements}}, $artist);
 337                     $self->state($STATE_ALBUMS);
 338                 }
 339                 else
 340                 {
 341                     $self->state($STATE_INVALID);
 342                 }
 343             }
 344         }
 345         else
 346         {
 347             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 348             $self->state($STATE_INVALID);
 349         }
 350     }
 351
 352     if($root_not && ($tags_seen < 2))
 353     {
 354         $self->{bare_not}=1;
 355     }
 356
 357     # remove trailing boolean
 358     my @elements=@{$self->{elements}};
 359     while(@elements && ref($elements[$#elements]) eq "ID3FS::PathElement::Boolean")
 360     {
 361         pop @elements;
 362     }
 363     # sort elements by precedence
 364     @elements=$self->sort_elements(@elements);
 365     $self->{tagtree}=$self->elements_to_tree(\@elements);
 366     if($self->{tagtree})
 367     {
 368         ($self->{sqlconditions},
 369          $self->{joins}) = $self->{tagtree}->to_sql();
 370 #       print "TREE: ",  $self->{tagtree}->print(), "\n";
 371 #       print("SQL CONDITION(", scalar(@{$self->{joins}}), "): ",
 372 #             $self->{sqlconditions}, "\n");
 373 #       use Data::Dumper;
 374 #       print Dumper $self->{tagtree};
 375     }
 376 }
 377
 378 sub state
 379 {
 380     my($self, $newstate)=@_;
 381     if(defined($newstate))
 382     {
 383         $self->{state}=$newstate;
 384         $self->{curtagdepth}++ if($newstate == $STATE_TAG);
 385     }
 386     return $self->{state};
 387 }
 388
 389 sub elements_to_tree
 390 {
 391     my($self, $elements)=@_;
 392     return undef unless(@$elements);
 393     my ($left, $right, $op)=(undef, undef, undef);
 394     my $thing=pop @$elements;
 395     if(ref($thing) eq "ID3FS::PathElement::Boolean")
 396     {
 397         my $op=$thing;
 398         $right=$self->elements_to_tree($elements);
 399         if($op->{name} ne "NOT")
 400         {
 401             $left=$self->elements_to_tree($elements);
 402         }
 403         return ID3FS::Path::Node->new($left, $op, $right);
 404     }
 405     else
 406     {
 407         return ID3FS::Path::Node->new($thing);
 408     }
 409 }
 410
 411 # Dijkstra's shunting-yard algorithm
 412 sub sort_elements
 413 {
 414     my ($self, @input)=@_;
 415     my @opstack=();
 416     my @output=();
 417 #    print "INPUT: ", join(', ', map { $_->{name}; } @input), "\n";
 418     while(my $thing = shift @input)
 419     {
 420         if(ref($thing) eq "ID3FS::PathElement::Tag")
 421         {
 422             # Handle tag values by dropping parent
 423             if(@input && ref($input[0]) eq "ID3FS::PathElement::Tag")
 424             {
 425                 $thing=shift @input;
 426             }
 427             push(@output, $thing);
 428         }
 429         elsif(ref($thing) eq "ID3FS::PathElement::Boolean")
 430         {
 431             # bool
 432             while(@opstack &&
 433                   ($priorities{$thing->{name}} <= $priorities{$opstack[$#opstack]->{name}}))
 434             {
 435                 push(@output, pop(@opstack));
 436             }
 437             push(@opstack, $thing);
 438         }
 439     }
 440     while(@opstack)
 441     {
 442         push(@output, pop(@opstack));
 443     }
 444 #    print "STACK: ", join(', ', map { $_->{name}; } @output), "\n";
 445     return @output;
 446 }
 447
 448 sub used_tags
 449 {
 450     my($self)=@_;
 451     return() unless(defined($self->{tagtree}));
 452     return($self->{tagtree}->used_tags());
 453 }
 454
 455 sub expecting_values
 456 {
 457     my($self)=@_;
 458     my $tail=$self->tail();
 459     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 460     {
 461         return($self->{db}->tag_has_values($tail->{id}));
 462     }
 463 }
 464
 465 sub trailing_tag_id
 466 {
 467     my($self)=@_;
 468     my $tail=$self->tail();
 469     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 470     {
 471         return($tail->{id});
 472     }
 473     return undef;
 474 }
 475
 476 sub trailing_tag_parent
 477 {
 478     my($self)=@_;
 479     my $tail=$self->tail();
 480     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 481     {
 482         return($tail->{parents_id});
 483     }
 484     return undef;
 485 }
 486
 487 sub tail
 488 {
 489     my($self)=@_;
 490     return($self->{elements}->[$#{$self->{elements}}]);
 491 }
 492
 493 # the one before last
 494 sub tail_parent
 495 {
 496     my($self)=@_;
 497     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 498 }
 499
 500 ######################################################################
 501
 502 sub tags
 503 {
 504     my($self)=@_;
 505     if(!$self->{tagtree}) # / or /NOT
 506     {
 507         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 508         return($self->{db}->cmd_firstcol($sql));
 509     }
 510     my $hasvals=$self->expecting_values();
 511     my $parent=$self->trailing_tag_parent();
 512 #    print "THASVALS: $hasvals\n";
 513 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 514     my @ids=();
 515     my $sql=("SELECT tags.name FROM (\n" .
 516              $self->tags_subselect() .
 517              ") AS subselect\n" .
 518              "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n" .
 519              "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n");
 520     my @allused=$self->used_tags();
 521     my @used=grep { ref($_) ne "ARRAY"; } @allused;
 522     my @used_with_vals=grep { ref($_) eq "ARRAY"; } @allused;
 523 #    print "tags(): USED: ", join(", ", @used), "\n";
 524 #    print "tags(): USED_WITH_VALS: ", join(", ", map { "[".$_->[0]. ", ".$_->[1]."]";} @used_with_vals), "\n";
 525     my @orclauses=();
 526     my @andclauses=();
 527     my $id=$self->trailing_tag_id();
 528     if($hasvals)
 529     {
 530 #       print "HAS_VALUES\n";
 531         my @values=map { "'".$_->[1]."'"; } grep { $_->[0] == $id; } @used_with_vals;
 532         my $clause="(tags.parents_id='$id'";
 533         if(@values)
 534         {
 535             $clause .= " AND tags.id NOT IN (" . join(', ', @values) . ")";
 536         }
 537         $clause .= ")";
 538         push(@andclauses, $clause);
 539     }
 540     else
 541     {
 542 #       print "HASNT VALUES\n";;
 543         if(@used)
 544         {
 545             push(@andclauses, "(NOT (tags.parents_id='' AND tags.id IN (" . join(', ', @used) . ")))");
 546         }
 547         for my $pair (@used_with_vals)
 548         {
 549             push(@andclauses, "(NOT (tags.parents_id='" . $pair->[0] . "' AND tags.id='" . $pair->[1] . "'))");
 550         }
 551     }
 552
 553     my $parentclause= "(tags.parents_id='";
 554     if($hasvals)
 555     {
 556         $parentclause .= $id;
 557     }
 558     elsif($parent)
 559     {
 560         $parentclause .= $parent;
 561     }
 562     $parentclause .= "')";
 563     push(@andclauses, $parentclause);
 564
 565     if(@orclauses)
 566     {
 567         push(@andclauses, '( ' . join(' OR ', @orclauses) . ' )');
 568     }
 569     if(@andclauses)
 570     {
 571         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 572     }
 573     $sql .= "GROUP BY tags.name;";
 574     print "SQL(TAGS): $sql\n" if($self->{verbose});
 575     my @tagnames=$self->{db}->cmd_firstcol($sql);
 576     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 577     return(@tagnames);
 578 }
 579
 580 sub artists
 581 {
 582     my($self)=@_;
 583     if(!@{$self->{elements}}) # /ALL
 584     {
 585         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 586         return($self->{db}->cmd_firstcol($sql));
 587     }
 588     my @ids=();
 589     my $sql=$self->sql_start("artists.name");
 590     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 591              "WHERE artists.name != ''\n" .
 592              "GROUP BY artists.name;");
 593     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 594     my @tagnames=$self->{db}->cmd_firstcol($sql);
 595     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 596     return(@tagnames);
 597 }
 598
 599 sub albums
 600 {
 601     my($self)=@_;
 602     my @ids=();
 603     my $tail=$self->tail();
 604     # FIXME: rework PathElements
 605     if(ref($tail) eq "ID3FS::PathElement::Artist")
 606     {
 607         return $self->artist_albums($tail->{id});
 608     }
 609     my $sql=$self->sql_start("albums.name");
 610     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 611              "WHERE albums.name != ''\n" .
 612              "GROUP BY albums.name;");
 613     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 614     my @names=$self->{db}->cmd_firstcol($sql);
 615     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 616     return(@names);
 617 }
 618
 619 sub artist_albums
 620 {
 621     my($self, $artist_id)=@_;
 622     my $sql=$self->sql_start("albums.name");
 623     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 624              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 625              "WHERE artists.id=? and albums.name <> ''\n" .
 626              "GROUP BY albums.name\n");
 627     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 628     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 629     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 630     return(@albums);
 631 }
 632
 633 sub artist_tracks
 634 {
 635     my($self, $artist_id)=@_;
 636     my $sql=$self->sql_start("files.name");
 637     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 638              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 639              "WHERE artists.id=? AND albums.name=''\n" .
 640              "GROUP BY files.name\n");
 641     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 642     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 643     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 644     return(@names);
 645 }
 646
 647 sub album_tracks
 648 {
 649     my($self, $artist_id, $album_id)=@_;
 650     my $sql=("SELECT files.name FROM files\n" .
 651              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 652              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 653              "WHERE artists.id=? AND albums.id=?\n" .
 654              "GROUP BY files.name\n");
 655     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 656     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 657     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 658     return(@names);
 659 }
 660
 661 sub tracks
 662 {
 663     my($self)=@_;
 664     # FIXME: rework PathElements
 665     my $tail=$self->tail();
 666     if(ref($tail) eq "ID3FS::PathElement::Artist")
 667     {
 668         return $self->artist_tracks($tail->{id});
 669     }
 670     elsif(ref($tail) eq "ID3FS::PathElement::Album")
 671     {
 672         my $artist_id=0;
 673         my $artist=$self->tail_parent();
 674         if(defined($artist) && (ref($artist) eq "ID3FS::PathElement::Artist"))
 675         {
 676             # should always happen
 677             $artist_id=$artist->{id};
 678         }
 679         return $self->album_tracks($artist_id, $tail->{id});
 680     }
 681     my $sql=$self->sql_start("files.name");
 682     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 683     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 684     {
 685         $sql .= "WHERE artists.name =''\n";
 686     }
 687     $sql .= "GROUP BY files.name;";
 688     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 689     my @names=$self->{db}->cmd_firstcol($sql);
 690     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 691     return(@names);
 692 }
 693
 694 sub filename
 695 {
 696     my($self, $mountpoint)=@_;
 697     my $tail=$self->tail();
 698     if(ref($tail) eq "ID3FS::PathElement::File")
 699     {
 700         my $id=$tail->{id};
 701         my $sql=("SELECT paths.name, files.name FROM files\n" .
 702                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 703                  "WHERE files.id=?\n" .
 704                  "GROUP BY paths.name, files.name");
 705         print "FILENAME SQL: $sql\n" if($self->{verbose});
 706         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 707         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 708         return($self->{db}->relativise($path, $name, $mountpoint));
 709     }
 710     # should never happen
 711     return "ERROR";
 712 }
 713
 714 sub tags_subselect
 715 {
 716     my($self)=@_;
 717     my $hasvals=$self->expecting_values();
 718     # we need to specially handle a bare /NOT/tag with no other clauses,
 719     # using a simple WHERE id !='tagid' instead of a LEFT JOIN
 720     if($self->{bare_not})
 721     {
 722         return $self->bare_not_subselect();
 723     }
 724     if($self->{in_all})
 725     {
 726         return "\tSELECT id FROM files AS files_id\n";
 727     }
 728     my $tree=$self->{tagtree};
 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 { ref($_) eq "ID3FS::PathElement::Tag"; } @{$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), ": ", $constraint->{name}, "\n";
 819         if(ref($constraint) eq "ID3FS::PathElement::Tag")
 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;