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->{path} =~ s/\/\//\//g; # drop doubled slashes
  35
  36     $self->parse();
  37 #    print "STATE: ", $self->state(), "\n";
  38     return $self;
  39 }
  40
  41 sub isdir
  42 {
  43     my($self)=@_;
  44     if(($self->state() == $STATE_FILE) ||
  45        ($self->state() == $STATE_INVALID))
  46     {
  47         return 0;
  48     }
  49     return 1;
  50 }
  51
  52 sub isfile
  53 {
  54     my($self)=@_;
  55     return($self->state() == $STATE_FILE);
  56 }
  57
  58 sub isvalid
  59 {
  60     my($self)=@_;
  61     return($self->state() != $STATE_INVALID);
  62 }
  63
  64 sub dest
  65 {
  66     my($self, $mountpoint)=@_;
  67     if($self->state() == $STATE_FILE)
  68     {
  69         return $self->filename($mountpoint);
  70     }
  71     return "ERROR"; #should never happen?
  72 }
  73
  74 sub dirents
  75 {
  76     my($self)=@_;
  77     my @dents=();
  78     my @fents=();
  79     my $state=$self->state();
  80 #    print "DIRENTS: STATE: $state\n";
  81 #    print "DIRENTS: FILE: $self->{path}\n";
  82     if($state==$STATE_ALL)
  83     {
  84         @dents=($self->artists(), $PATH_ALLTRACKS, $PATH_NOARTIST);
  85     }
  86     elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
  87     {
  88         my $tag=$self->tail();
  89         if($state==$STATE_TAG &&
  90            defined($tag) &&
  91            ref($tag) eq "ID3FS::PathElement::Tag" &&
  92            $self->{db}->tag_has_values($tag->{id}))
  93         {
  94             @dents=$self->tags();
  95         }
  96         else
  97         {
  98             @dents=($self->artists(), qw(AND OR), $PATH_ALLTRACKS, $PATH_NOARTIST);
  99         }
 100     }
 101     elsif($state==$STATE_BOOLEAN)
 102     {
 103         @dents=$self->tags();
 104         my $parent=$self->tail();
 105         unless(defined($parent) &&
 106                ref($parent) eq "ID3FS::PathElement::Boolean" &&
 107                $parent->{name} eq "NOT")
 108         {
 109             push(@dents, "NOT");
 110         }
 111     }
 112     elsif($state==$STATE_ROOT)
 113     {
 114         @dents=($self->tags(), qw(ALL NOT));
 115     }
 116     elsif($state==$STATE_ALBUMS)
 117     {
 118         @dents=($self->albums(), $PATH_ALLTRACKS, $PATH_NOALBUM);
 119     }
 120     elsif($state==$STATE_TRACKLIST)
 121     {
 122         @fents=$self->tracks();
 123     }
 124     else
 125     {
 126         print "DIRENTS: UNHANDLED STATE: $state\n";
 127     }
 128     return(\@dents, \@fents);
 129 }
 130
 131 sub parse
 132 {
 133     my($self)=@_;
 134     @{$self->{components}}=split(/\//, $self->{path});
 135     shift @{$self->{components}}; # drop empty field before leading /
 136 #    print "PATH: $self->{path}\n";
 137     $self->state($STATE_ROOT);
 138     return if($self->{path} eq "/");
 139     my @parts=@{$self->{components}};
 140     my($tag, $tagval);
 141     $self->{elements}=[];
 142     $self->{bare_not}=0;
 143     $self->{in_all}=0;
 144     my $root_not=0;
 145     my $tags_seen=0;
 146     while(defined(my $name=shift @parts))
 147     {
 148 #       print "NAME: $name\n";
 149         my $state=$self->state();
 150         if($state==$STATE_INVALID)
 151         {
 152 #           print "SM: INVALID: $name\n";
 153             return;
 154         }
 155         elsif($state==$STATE_ROOT)
 156         {
 157 #           print "SM: ROOT: $name\n";
 158             if($name eq "ALL")
 159             {
 160                 $self->{in_all}=1;
 161                 $self->state($STATE_ALL);
 162             }
 163             elsif($name eq "NOT")
 164             {
 165                 $root_not=1;
 166                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 167                 $self->state($STATE_BOOLEAN);
 168             }
 169             else
 170             {
 171                 $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 172                 if($tag)
 173                 {
 174                     push(@{$self->{elements}}, $tag);
 175                     $tags_seen++;
 176                     $self->state($STATE_TAG);
 177                 }
 178                 else
 179                 {
 180                     $self->state($STATE_INVALID);
 181                 }
 182             }
 183         }
 184         elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
 185         {
 186 #           print "SM: TAG/TAGVAL($state): $name\n";
 187             my $tag=$self->tail();
 188             if($state==$STATE_TAG &&
 189                defined($tag) &&
 190                ref($tag) eq "ID3FS::PathElement::Tag" &&
 191                $self->{db}->tag_has_values($tag->{id}))
 192             {
 193 #               print "Parsing: parent: $tag->{id}\n";
 194                 my $tagval=ID3FS::PathElement::Tag->new($self->{db}, $name, $tag->{id});
 195                 if(defined($tagval))
 196                 {
 197                     $self->state($STATE_TAGVAL);
 198                     # stay in tag state
 199                     push(@{$self->{elements}}, $tagval);
 200                 }
 201                 else
 202                 {
 203                     $self->state($STATE_INVALID);
 204                 }
 205             }
 206             elsif($name eq $PATH_ALLTRACKS)
 207             {
 208                 $self->state($STATE_TRACKLIST);
 209             }
 210             elsif($name eq $PATH_NOARTIST)
 211             {
 212                 $self->state($STATE_TRACKLIST);
 213             }
 214             elsif($name eq "AND")
 215             {
 216                 $self->state($STATE_BOOLEAN);
 217                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 218             }
 219             elsif($name eq "OR")
 220             {
 221                 $self->state($STATE_BOOLEAN);
 222                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 223             }
 224             else
 225             {
 226                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 227                 if($artist)
 228                 {
 229                     push(@{$self->{elements}}, $artist);
 230                     $self->state($STATE_ALBUMS);
 231                 }
 232                 else
 233                 {
 234                     $self->state($STATE_INVALID);
 235                 }
 236             }
 237         }
 238         elsif($state==$STATE_BOOLEAN)
 239         {
 240 #           print "SM: BOOLEAN: $name\n";
 241             my $parent=$self->tail();
 242             my $allownot=1;
 243             if(defined($parent) &&
 244                ref($parent) eq "ID3FS::PathElement::Boolean" &&
 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                 # FIXME
 323                 $self->state($STATE_TRACKLIST);
 324             }
 325             else
 326             {
 327                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 328                 if($artist)
 329                 {
 330                     push(@{$self->{elements}}, $artist);
 331                     $self->state($STATE_ALBUMS);
 332                 }
 333                 else
 334                 {
 335                     $self->state($STATE_INVALID);
 336                 }
 337             }
 338         }
 339         else
 340         {
 341             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 342             $self->state($STATE_INVALID);
 343         }
 344     }
 345
 346     if($root_not && ($tags_seen < 2))
 347     {
 348         $self->{bare_not}=1;
 349     }
 350
 351     # remove trailing boolean
 352     my @elements=@{$self->{elements}};
 353     while(@elements && ref($elements[$#elements]) eq "ID3FS::PathElement::Boolean")
 354     {
 355         pop @elements;
 356     }
 357     # sort elements by precedence
 358     @elements=$self->sort_elements(@elements);
 359     $self->{tagtree}=$self->elements_to_tree(\@elements);
 360     if($self->{tagtree})
 361     {
 362         ($self->{sqlconditions},
 363          $self->{joins}) = $self->{tagtree}->to_sql();
 364 #       print "TREE: ",  $self->{tagtree}->print(), "\n";
 365 #       print("SQL CONDITION(", scalar(@{$self->{joins}}), "): ",
 366 #             $self->{sqlconditions}, "\n");
 367 #       use Data::Dumper;
 368 #       print Dumper $self->{tagtree};
 369     }
 370 }
 371
 372 sub state
 373 {
 374     my($self, $newstate)=@_;
 375     $self->{state}=$newstate if(defined($newstate));
 376     return $self->{state};
 377 }
 378
 379 sub elements_to_tree
 380 {
 381     my($self, $elements)=@_;
 382     return undef unless(@$elements);
 383     my ($left, $right, $op)=(undef, undef, undef);
 384     my $thing=pop @$elements;
 385     if(ref($thing) eq "ID3FS::PathElement::Boolean")
 386     {
 387         my $op=$thing;
 388         $right=$self->elements_to_tree($elements);
 389         if($op->{name} ne "NOT")
 390         {
 391             $left=$self->elements_to_tree($elements);
 392         }
 393         return ID3FS::Path::Node->new($left, $op, $right);
 394     }
 395     else
 396     {
 397         return ID3FS::Path::Node->new($thing);
 398     }
 399 }
 400
 401 # Dijkstra's shunting-yard algorithm
 402 sub sort_elements
 403 {
 404     my ($self, @input)=@_;
 405     my @opstack=();
 406     my @output=();
 407 #    print "INPUT: ", join(', ', map { $_->{name}; } @input), "\n";
 408     while(my $thing = shift @input)
 409     {
 410         if(ref($thing) eq "ID3FS::PathElement::Tag")
 411         {
 412             # Handle tag values by dropping parent
 413             if(@input && ref($input[0]) eq "ID3FS::PathElement::Tag")
 414             {
 415                 $thing=shift @input;
 416             }
 417             push(@output, $thing);
 418         }
 419         elsif(ref($thing) eq "ID3FS::PathElement::Boolean")
 420         {
 421             # bool
 422             while(@opstack &&
 423                   ($priorities{$thing->{name}} <= $priorities{$opstack[$#opstack]->{name}}))
 424             {
 425                 push(@output, pop(@opstack));
 426             }
 427             push(@opstack, $thing);
 428         }
 429     }
 430     while(@opstack)
 431     {
 432         push(@output, pop(@opstack));
 433     }
 434 #    print "STACK: ", join(', ', map { $_->{name}; } @output), "\n";
 435     return @output;
 436 }
 437
 438 sub used_tags
 439 {
 440     my($self)=@_;
 441     return() unless(defined($self->{tagtree}));
 442     return($self->{tagtree}->used_tags());
 443 }
 444
 445 sub expecting_values
 446 {
 447     my($self)=@_;
 448     my $tail=$self->tail();
 449     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 450     {
 451         return($self->{db}->tag_has_values($tail->{id}));
 452     }
 453 }
 454
 455 sub trailing_tag_id
 456 {
 457     my($self)=@_;
 458     my $tail=$self->tail();
 459     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 460     {
 461         return($tail->{id});
 462     }
 463     return undef;
 464 }
 465
 466 sub trailing_tag_parent
 467 {
 468     my($self)=@_;
 469     my $tail=$self->tail();
 470     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 471     {
 472         return($tail->{parents_id});
 473     }
 474     return undef;
 475 }
 476
 477 sub tail
 478 {
 479     my($self)=@_;
 480     return($self->{elements}->[$#{$self->{elements}}]);
 481 }
 482
 483 # the one before last
 484 sub tail_parent
 485 {
 486     my($self)=@_;
 487     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 488 }
 489
 490 ######################################################################
 491
 492 sub tags
 493 {
 494     my($self)=@_;
 495     if(!$self->{tagtree}) # / or /NOT
 496     {
 497         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 498         return($self->{db}->cmd_firstcol($sql));
 499     }
 500     my $hasvals=$self->expecting_values();
 501     my $parent=$self->trailing_tag_parent();
 502 #    print "THASVALS: $hasvals\n";
 503 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 504     my @ids=();
 505     my $sql=("SELECT tags.name FROM (\n" .
 506              $self->tags_subselect() .
 507              ") AS subselect\n" .
 508              "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n" .
 509              "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n");
 510     my @allused=$self->used_tags();
 511     my @used=grep { ref($_) ne "ARRAY"; } @allused;
 512     my @used_with_vals=grep { ref($_) eq "ARRAY"; } @allused;
 513 #    print "tags(): USED: ", join(", ", @used), "\n";
 514 #    print "tags(): USED_WITH_VALS: ", join(", ", map { "[".$_->[0]. ", ".$_->[1]."]";} @used_with_vals), "\n";
 515     my @orclauses=();
 516     my @andclauses=();
 517     my $id=$self->trailing_tag_id();
 518     if($hasvals)
 519     {
 520 #       print "HAS_VALUES\n";
 521         my @values=map { "'".$_->[1]."'"; } grep { $_->[0] == $id; } @used_with_vals;
 522         my $clause="(tags.parents_id='$id'";
 523         if(@values)
 524         {
 525             $clause .= " AND tags.id NOT IN (" . join(', ', @values) . ")";
 526         }
 527         $clause .= ")";
 528         push(@andclauses, $clause);
 529     }
 530     else
 531     {
 532 #       print "HASNT VALUES\n";;
 533         if(@used)
 534         {
 535             push(@andclauses, "(NOT (tags.parents_id='' AND tags.id IN (" . join(', ', @used) . ")))");
 536         }
 537         for my $pair (@used_with_vals)
 538         {
 539             push(@andclauses, "(NOT (tags.parents_id='" . $pair->[0] . "' AND tags.id='" . $pair->[1] . "'))");
 540         }
 541     }
 542
 543     my $parentclause= "(tags.parents_id='";
 544     if($hasvals)
 545     {
 546         $parentclause .= $id;
 547     }
 548     elsif($parent)
 549     {
 550         $parentclause .= $parent;
 551     }
 552     $parentclause .= "')";
 553     push(@andclauses, $parentclause);
 554
 555     if(@orclauses)
 556     {
 557         push(@andclauses, '( ' . join(' OR ', @orclauses) . ' )');
 558     }
 559     if(@andclauses)
 560     {
 561         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 562     }
 563     $sql .= "GROUP BY tags.name;";
 564     print "SQL(TAGS): $sql\n" if($self->{verbose});
 565     my @tagnames=$self->{db}->cmd_firstcol($sql);
 566     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 567     return(@tagnames);
 568 }
 569
 570 sub artists
 571 {
 572     my($self)=@_;
 573     if(!@{$self->{elements}}) # /ALL
 574     {
 575         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 576         return($self->{db}->cmd_firstcol($sql));
 577     }
 578     my @ids=();
 579     my $sql=$self->sql_start("artists.name");
 580     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 581              "WHERE artists.name != ''\n" .
 582              "GROUP BY artists.name;");
 583     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 584     my @tagnames=$self->{db}->cmd_firstcol($sql);
 585     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 586     return(@tagnames);
 587 }
 588
 589 sub albums
 590 {
 591     my($self)=@_;
 592     my @ids=();
 593     my $tail=$self->tail();
 594     # FIXME: rework PathElements
 595     if(ref($tail) eq "ID3FS::PathElement::Artist")
 596     {
 597         return $self->artist_albums($tail->{id});
 598     }
 599     my $sql=$self->sql_start("albums.name");
 600     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 601              "WHERE albums.name != ''\n" .
 602              "GROUP BY albums.name;");
 603     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 604     my @names=$self->{db}->cmd_firstcol($sql);
 605     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 606     return(@names);
 607 }
 608
 609 sub artist_albums
 610 {
 611     my($self, $artist_id)=@_;
 612     my $sql=$self->sql_start("albums.name");
 613     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 614              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 615              "WHERE artists.id=? and albums.name <> ''\n" .
 616              "GROUP BY albums.name\n");
 617     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 618     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 619     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 620     return(@albums);
 621 }
 622
 623 sub artist_tracks
 624 {
 625     my($self, $artist_id)=@_;
 626     my $sql=$self->sql_start("files.name");
 627     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 628              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 629              "WHERE artists.id=? AND albums.name=''\n" .
 630              "GROUP BY files.name\n");
 631     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 632     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 633     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 634     return(@names);
 635 }
 636
 637 sub album_tracks
 638 {
 639     my($self, $artist_id, $album_id)=@_;
 640     my $sql=("SELECT files.name FROM files\n" .
 641              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 642              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 643              "WHERE artists.id=? AND albums.id=?\n" .
 644              "GROUP BY files.name\n");
 645     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 646     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 647     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 648     return(@names);
 649 }
 650
 651 sub tracks
 652 {
 653     my($self)=@_;
 654     # FIXME: rework PathElements
 655     my $tail=$self->tail();
 656     if(ref($tail) eq "ID3FS::PathElement::Artist")
 657     {
 658         return $self->artist_tracks($tail->{id});
 659     }
 660     elsif(ref($tail) eq "ID3FS::PathElement::Album")
 661     {
 662         my $artist_id=0;
 663         my $artist=$self->tail_parent();
 664         if(defined($artist) && (ref($artist) eq "ID3FS::PathElement::Artist"))
 665         {
 666             # should always happen
 667             $artist_id=$artist->{id};
 668         }
 669         return $self->album_tracks($artist_id, $tail->{id});
 670     }
 671     my $sql=$self->sql_start("files.name");
 672     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 673     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 674     {
 675         $sql .= "WHERE artists.name =''\n";
 676     }
 677     $sql .= "GROUP BY files.name;";
 678     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 679     my @names=$self->{db}->cmd_firstcol($sql);
 680     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 681     return(@names);
 682 }
 683
 684 sub filename
 685 {
 686     my($self, $mountpoint)=@_;
 687     my $tail=$self->tail();
 688     if(ref($tail) eq "ID3FS::PathElement::File")
 689     {
 690         my $id=$tail->{id};
 691         my $sql=("SELECT paths.name, files.name FROM files\n" .
 692                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 693                  "WHERE files.id=?\n" .
 694                  "GROUP BY paths.name, files.name");
 695         print "FILENAME SQL: $sql\n" if($self->{verbose});
 696         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 697         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 698         return($self->{db}->relativise($path, $name, $mountpoint));
 699     }
 700     die("DB::filename: unhandled case\n"); #FIXME
 701 }
 702
 703 sub tags_subselect
 704 {
 705     my($self)=@_;
 706     my $hasvals=$self->expecting_values();
 707     # we need to specially handle a bare /NOT/tag with no other clauses,
 708     # using a simple WHERE id !='tagid' instead of a LEFT JOIN
 709     if($self->{bare_not})
 710     {
 711         return $self->bare_not_subselect();
 712     }
 713     if($self->{in_all})
 714     {
 715         return "\tSELECT id FROM files AS files_id\n";
 716     }
 717     my $tree=$self->{tagtree};
 718     my $parent=$self->trailing_tag_parent();
 719
 720 #    print "ELEMENTS: ", join('/', map { $_->{name}; } @{$self->{elements}}), "\n";
 721 #    print "TREE: ", $tree->print(), "\n";
 722     my $tag=undef;
 723     if($hasvals)
 724     {
 725         $tag=$self->trailing_tag_id();
 726 #       print "Trailing id: $tag\n";
 727     }
 728     my ($sqlclause, @joins)=(undef, ());
 729     ($sqlclause, @joins) = $tree->to_sql($hasvals) if($tree);
 730 #    print "SQL(" . scalar(@joins) .": $sqlclause\n";
 731     my $sql="\tSELECT fxt1.files_id FROM tags t1";
 732     my @crosses=();
 733     my @inners=();
 734 #    $joinsneeded++ if($tag);
 735     for(my $i=0; $i <= $#joins; $i++)
 736     {
 737         my $cnt=$i+1;
 738         my $join=$joins[$i];
 739         my $inner=("\t$join JOIN files_x_tags fxt$cnt ON " .
 740                    "t${cnt}.id=fxt${cnt}.tags_id");
 741         if($i > 0)
 742         {
 743             push(@crosses, "CROSS JOIN tags t$cnt");
 744             $inner .= " AND fxt1.files_id=fxt${cnt}.files_id";
 745         }
 746         push(@inners, $inner);
 747     }
 748     $sql .= ("\n\t" . join(" ", @crosses)) if(@crosses);
 749     $sql .= ("\n" . join("\n", @inners)) if(@inners);
 750     $sql .= "\n\tWHERE $sqlclause" if($sqlclause);
 751 #    if($tag)
 752 #    {
 753 #       $sql .= " AND t${joinsneeded}.parents_id='$tag'";
 754 #    }
 755     $sql .= "\n\tGROUP BY fxt1.files_id\n";
 756     return $sql;
 757 }
 758
 759 sub bare_not_subselect
 760 {
 761     my($self)=@_;
 762     my @tags=grep { ref($_) eq "ID3FS::PathElement::Tag"; } @{$self->{elements}};
 763     my $sql=("\tSELECT f1.id AS files_id FROM files f1 WHERE f1.id NOT IN (\n" .
 764              "\t\tSELECT fxt1.files_id FROM tags t1\n" .
 765              "\t\tINNER JOIN files_x_tags fxt1 ON t1.id=fxt1.tags_id\n" .
 766              "\t\tWHERE ");
 767     if(scalar(@tags) > 1)
 768     {
 769         $sql .= ("(t1.parents_id='" . $tags[0]->{id} . "' AND t1.id='" .
 770                  $tags[1]->{id} . "')");
 771     }
 772     else
 773     {
 774         $sql .= ("(t1.parents_id='' AND t1.id='" . $tags[0]->{id} . "')");
 775     }
 776     $sql .= "\n\t\tGROUP BY fxt1.files_id\n\t)\n";
 777     return($sql);
 778 }
 779
 780 sub sql_start
 781 {
 782     my($self, $tables)=@_;
 783     my $sql="SELECT $tables FROM ";
 784     if($self->{in_all})
 785     {
 786         $sql .= "files\n";
 787     }
 788     else
 789     {
 790         $sql .= ("(\n" .
 791                  $self->tags_subselect() .
 792                  ") AS subselect\n" .
 793                  "INNER JOIN files ON subselect.files_id=files.id\n");
 794     }
 795     return $sql;
 796 }
 797
 798
 799 sub constraints_tag_list
 800 {
 801     my($self, @constraints)=@_;
 802     my $lasttag=undef;
 803     my @tags=();
 804     my @tags_vals=();
 805     for my $constraint (@constraints)
 806     {
 807 #       print ref($constraint), ": ", $constraint->{name}, "\n";
 808         if(ref($constraint) eq "ID3FS::PathElement::Tag")
 809         {
 810             if(defined($lasttag))
 811             {
 812 #               print "TAGVAL\n";
 813                 push(@tags_vals, [$lasttag, $constraint->{id}]) if defined($constraint->{id});
 814                 $lasttag=undef;
 815             }
 816             elsif($self->tag_has_values($constraint->{id}))
 817             {
 818 #               print "HASVALUES\n";
 819                 $lasttag=$constraint->{id} if defined($constraint->{id});
 820             }
 821             else
 822             {
 823 #               print "NOVALUES\n";
 824                 push(@tags, $constraint->{id}) if(defined($constraint->{id}));
 825             }
 826         }
 827     }
 828     unless($self->{db}->{postgres})
 829     {
 830         @tags=map{ "\"$_\""; } @tags;
 831         @tags_vals=map( { [ map({ "\"$_\""; } @$_ ) ] } @tags_vals);
 832         $lasttag="\"$lasttag\"" if defined($lasttag);
 833     }
 834     return(\@tags, \@tags_vals, $lasttag);
 835 }
 836
 837 # Not used, slows things down too much
 838 sub filter
 839 {
 840     my($self, @dirs)=@_;
 841     my $base=$self->{path};
 842     my @outdirs=();
 843     # depth 4 to allow for tag/tagval/AND/NOT
 844     my $maxdepth=4;
 845     for my $dir (@dirs)
 846     {
 847 #       print "\nFILTER (",$self->state(), "): $base / $dir\n";
 848         if($self->empty("$base/$dir", $maxdepth))
 849         {
 850 #           print "empty: $base / $dir\n";
 851         }
 852         else
 853         {
 854 #           print "non-empty, accepting: $base / $dir\n";
 855             push(@outdirs, $dir);
 856         }
 857     }
 858     return(@outdirs);
 859 }
 860
 861 sub empty
 862 {
 863     my($self, $dir, $maxdepth)=@_;
 864     return 0 unless($maxdepth);
 865 #    print "testing($maxdepth): $dir\n";
 866     my $path=ID3FS::Path->new($self->{db}, $dir, $self->{verbose});
 867 #    print "PATH INVALID\n" unless($path->isvalid());
 868     return 1 unless($path->isvalid());
 869     my($subdirs,$subfiles)=$path->dirents();
 870 #    print "SUBDENTS: ", join(", ", @$subdirs, @$subfiles), "\n";
 871 #    print("SUBFILES: ", join(', ', @$subfiles), "\n") if(@$subfiles);
 872     return 0 if(@$subfiles);
 873     for my $subdir (@$subdirs)
 874     {
 875 #       print "SUBSUB $dir/$subdir\n";
 876         if(1) #$self->dir_is_special($subdir))
 877         {
 878             if($self->empty("$dir/$subdir", ($maxdepth-1)))
 879             {
 880 #               print "EMPTY: $dir / $subdir\n";
 881             }
 882             else
 883             {
 884 #               print "NONEMPTY: $dir / $subdir\n";
 885                 return 0;
 886             }
 887         }
 888         else
 889         {
 890             return 0;
 891         }
 892 #       return 0 if($self->nonempty("$dir/$subdir", ($maxdepth-1)));
 893     }
 894     return 1;
 895 }
 896
 897 sub dir_is_special
 898 {
 899     my($self, $dir)=@_;
 900     my $id=$self->{db}->lookup_id("tags", $dir);
 901     if((grep { $_ eq $dir; } (qw(AND OR NOT), $PATH_ALLTRACKS,
 902                               $PATH_NOARTIST, $PATH_NOALBUM)) ||
 903        ($id && $self->{db}->tag_has_values($id)))
 904     {
 905         return 1;
 906     }
 907     return 0;
 908 }
 909
 910 1;