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                 # FIXME
 330                 $self->state($STATE_TRACKLIST);
 331             }
 332             else
 333             {
 334                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 335                 if($artist)
 336                 {
 337                     push(@{$self->{elements}}, $artist);
 338                     $self->state($STATE_ALBUMS);
 339                 }
 340                 else
 341                 {
 342                     $self->state($STATE_INVALID);
 343                 }
 344             }
 345         }
 346         else
 347         {
 348             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 349             $self->state($STATE_INVALID);
 350         }
 351     }
 352
 353     if($root_not && ($tags_seen < 2))
 354     {
 355         $self->{bare_not}=1;
 356     }
 357
 358     # remove trailing boolean
 359     my @elements=@{$self->{elements}};
 360     while(@elements && ref($elements[$#elements]) eq "ID3FS::PathElement::Boolean")
 361     {
 362         pop @elements;
 363     }
 364     # sort elements by precedence
 365     @elements=$self->sort_elements(@elements);
 366     $self->{tagtree}=$self->elements_to_tree(\@elements);
 367     if($self->{tagtree})
 368     {
 369         ($self->{sqlconditions},
 370          $self->{joins}) = $self->{tagtree}->to_sql();
 371 #       print "TREE: ",  $self->{tagtree}->print(), "\n";
 372 #       print("SQL CONDITION(", scalar(@{$self->{joins}}), "): ",
 373 #             $self->{sqlconditions}, "\n");
 374 #       use Data::Dumper;
 375 #       print Dumper $self->{tagtree};
 376     }
 377 }
 378
 379 sub state
 380 {
 381     my($self, $newstate)=@_;
 382     if(defined($newstate))
 383     {
 384         $self->{state}=$newstate;
 385         $self->{curtagdepth}++ if($newstate == $STATE_TAG);
 386     }
 387     return $self->{state};
 388 }
 389
 390 sub elements_to_tree
 391 {
 392     my($self, $elements)=@_;
 393     return undef unless(@$elements);
 394     my ($left, $right, $op)=(undef, undef, undef);
 395     my $thing=pop @$elements;
 396     if(ref($thing) eq "ID3FS::PathElement::Boolean")
 397     {
 398         my $op=$thing;
 399         $right=$self->elements_to_tree($elements);
 400         if($op->{name} ne "NOT")
 401         {
 402             $left=$self->elements_to_tree($elements);
 403         }
 404         return ID3FS::Path::Node->new($left, $op, $right);
 405     }
 406     else
 407     {
 408         return ID3FS::Path::Node->new($thing);
 409     }
 410 }
 411
 412 # Dijkstra's shunting-yard algorithm
 413 sub sort_elements
 414 {
 415     my ($self, @input)=@_;
 416     my @opstack=();
 417     my @output=();
 418 #    print "INPUT: ", join(', ', map { $_->{name}; } @input), "\n";
 419     while(my $thing = shift @input)
 420     {
 421         if(ref($thing) eq "ID3FS::PathElement::Tag")
 422         {
 423             # Handle tag values by dropping parent
 424             if(@input && ref($input[0]) eq "ID3FS::PathElement::Tag")
 425             {
 426                 $thing=shift @input;
 427             }
 428             push(@output, $thing);
 429         }
 430         elsif(ref($thing) eq "ID3FS::PathElement::Boolean")
 431         {
 432             # bool
 433             while(@opstack &&
 434                   ($priorities{$thing->{name}} <= $priorities{$opstack[$#opstack]->{name}}))
 435             {
 436                 push(@output, pop(@opstack));
 437             }
 438             push(@opstack, $thing);
 439         }
 440     }
 441     while(@opstack)
 442     {
 443         push(@output, pop(@opstack));
 444     }
 445 #    print "STACK: ", join(', ', map { $_->{name}; } @output), "\n";
 446     return @output;
 447 }
 448
 449 sub used_tags
 450 {
 451     my($self)=@_;
 452     return() unless(defined($self->{tagtree}));
 453     return($self->{tagtree}->used_tags());
 454 }
 455
 456 sub expecting_values
 457 {
 458     my($self)=@_;
 459     my $tail=$self->tail();
 460     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 461     {
 462         return($self->{db}->tag_has_values($tail->{id}));
 463     }
 464 }
 465
 466 sub trailing_tag_id
 467 {
 468     my($self)=@_;
 469     my $tail=$self->tail();
 470     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 471     {
 472         return($tail->{id});
 473     }
 474     return undef;
 475 }
 476
 477 sub trailing_tag_parent
 478 {
 479     my($self)=@_;
 480     my $tail=$self->tail();
 481     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 482     {
 483         return($tail->{parents_id});
 484     }
 485     return undef;
 486 }
 487
 488 sub tail
 489 {
 490     my($self)=@_;
 491     return($self->{elements}->[$#{$self->{elements}}]);
 492 }
 493
 494 # the one before last
 495 sub tail_parent
 496 {
 497     my($self)=@_;
 498     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 499 }
 500
 501 ######################################################################
 502
 503 sub tags
 504 {
 505     my($self)=@_;
 506     if(!$self->{tagtree}) # / or /NOT
 507     {
 508         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 509         return($self->{db}->cmd_firstcol($sql));
 510     }
 511     my $hasvals=$self->expecting_values();
 512     my $parent=$self->trailing_tag_parent();
 513 #    print "THASVALS: $hasvals\n";
 514 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 515     my @ids=();
 516     my $sql=("SELECT tags.name FROM (\n" .
 517              $self->tags_subselect() .
 518              ") AS subselect\n" .
 519              "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n" .
 520              "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n");
 521     my @allused=$self->used_tags();
 522     my @used=grep { ref($_) ne "ARRAY"; } @allused;
 523     my @used_with_vals=grep { ref($_) eq "ARRAY"; } @allused;
 524 #    print "tags(): USED: ", join(", ", @used), "\n";
 525 #    print "tags(): USED_WITH_VALS: ", join(", ", map { "[".$_->[0]. ", ".$_->[1]."]";} @used_with_vals), "\n";
 526     my @orclauses=();
 527     my @andclauses=();
 528     my $id=$self->trailing_tag_id();
 529     if($hasvals)
 530     {
 531 #       print "HAS_VALUES\n";
 532         my @values=map { "'".$_->[1]."'"; } grep { $_->[0] == $id; } @used_with_vals;
 533         my $clause="(tags.parents_id='$id'";
 534         if(@values)
 535         {
 536             $clause .= " AND tags.id NOT IN (" . join(', ', @values) . ")";
 537         }
 538         $clause .= ")";
 539         push(@andclauses, $clause);
 540     }
 541     else
 542     {
 543 #       print "HASNT VALUES\n";;
 544         if(@used)
 545         {
 546             push(@andclauses, "(NOT (tags.parents_id='' AND tags.id IN (" . join(', ', @used) . ")))");
 547         }
 548         for my $pair (@used_with_vals)
 549         {
 550             push(@andclauses, "(NOT (tags.parents_id='" . $pair->[0] . "' AND tags.id='" . $pair->[1] . "'))");
 551         }
 552     }
 553
 554     my $parentclause= "(tags.parents_id='";
 555     if($hasvals)
 556     {
 557         $parentclause .= $id;
 558     }
 559     elsif($parent)
 560     {
 561         $parentclause .= $parent;
 562     }
 563     $parentclause .= "')";
 564     push(@andclauses, $parentclause);
 565
 566     if(@orclauses)
 567     {
 568         push(@andclauses, '( ' . join(' OR ', @orclauses) . ' )');
 569     }
 570     if(@andclauses)
 571     {
 572         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 573     }
 574     $sql .= "GROUP BY tags.name;";
 575     print "SQL(TAGS): $sql\n" if($self->{verbose});
 576     my @tagnames=$self->{db}->cmd_firstcol($sql);
 577     print("SUBNAMES: ", join(', ', @tagnames), "\n") if($self->{verbose});
 578     return(@tagnames);
 579 }
 580
 581 sub artists
 582 {
 583     my($self)=@_;
 584     if(!@{$self->{elements}}) # /ALL
 585     {
 586         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 587         return($self->{db}->cmd_firstcol($sql));
 588     }
 589     my @ids=();
 590     my $sql=$self->sql_start("artists.name");
 591     $sql .= ("INNER JOIN artists ON files.artists_id=artists.id\n" .
 592              "WHERE artists.name != ''\n" .
 593              "GROUP BY artists.name;");
 594     print "SQL(ARTISTS): $sql\n" if($self->{verbose});
 595     my @tagnames=$self->{db}->cmd_firstcol($sql);
 596     print("ARTISTS: ", join(', ', @tagnames), "\n") if($self->{verbose});
 597     return(@tagnames);
 598 }
 599
 600 sub albums
 601 {
 602     my($self)=@_;
 603     my @ids=();
 604     my $tail=$self->tail();
 605     # FIXME: rework PathElements
 606     if(ref($tail) eq "ID3FS::PathElement::Artist")
 607     {
 608         return $self->artist_albums($tail->{id});
 609     }
 610     my $sql=$self->sql_start("albums.name");
 611     $sql .= ("INNER JOIN albums ON files.albums_id=albums.id\n" .
 612              "WHERE albums.name != ''\n" .
 613              "GROUP BY albums.name;");
 614     print "SQL(ALBUMS): \n$sql\n" if($self->{verbose});
 615     my @names=$self->{db}->cmd_firstcol($sql);
 616     print("ALBUMS: ", join(', ', @names), "\n") if($self->{verbose});
 617     return(@names);
 618 }
 619
 620 sub artist_albums
 621 {
 622     my($self, $artist_id)=@_;
 623     my $sql=$self->sql_start("albums.name");
 624     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 625              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 626              "WHERE artists.id=? and albums.name <> ''\n" .
 627              "GROUP BY albums.name\n");
 628     print "ARTIST_ALBUMS SQL: $sql\n" if($self->{verbose});
 629     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 630     print("ALBUMS: ", join(', ', @albums), "\n") if($self->{verbose});
 631     return(@albums);
 632 }
 633
 634 sub artist_tracks
 635 {
 636     my($self, $artist_id)=@_;
 637     my $sql=$self->sql_start("files.name");
 638     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 639              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 640              "WHERE artists.id=? AND albums.name=''\n" .
 641              "GROUP BY files.name\n");
 642     print "ARTIST_TRACKS SQL: $sql\n" if($self->{verbose});
 643     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 644     print("ARTISTTRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 645     return(@names);
 646 }
 647
 648 sub album_tracks
 649 {
 650     my($self, $artist_id, $album_id)=@_;
 651     my $sql=("SELECT files.name FROM files\n" .
 652              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 653              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 654              "WHERE artists.id=? AND albums.id=?\n" .
 655              "GROUP BY files.name\n");
 656     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n" if($self->{verbose});
 657     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 658     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 659     return(@names);
 660 }
 661
 662 sub tracks
 663 {
 664     my($self)=@_;
 665     # FIXME: rework PathElements
 666     my $tail=$self->tail();
 667     if(ref($tail) eq "ID3FS::PathElement::Artist")
 668     {
 669         return $self->artist_tracks($tail->{id});
 670     }
 671     elsif(ref($tail) eq "ID3FS::PathElement::Album")
 672     {
 673         my $artist_id=0;
 674         my $artist=$self->tail_parent();
 675         if(defined($artist) && (ref($artist) eq "ID3FS::PathElement::Artist"))
 676         {
 677             # should always happen
 678             $artist_id=$artist->{id};
 679         }
 680         return $self->album_tracks($artist_id, $tail->{id});
 681     }
 682     my $sql=$self->sql_start("files.name");
 683     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 684     if($self->{components}->[$#{$self->{components}}] eq $PATH_NOARTIST)
 685     {
 686         $sql .= "WHERE artists.name =''\n";
 687     }
 688     $sql .= "GROUP BY files.name;";
 689     print "TRACKS SQL($self->{path}): $sql\n" if($self->{verbose});
 690     my @names=$self->{db}->cmd_firstcol($sql);
 691     print("TRACKS: ", join(', ', @names), "\n") if($self->{verbose});
 692     return(@names);
 693 }
 694
 695 sub filename
 696 {
 697     my($self, $mountpoint)=@_;
 698     my $tail=$self->tail();
 699     if(ref($tail) eq "ID3FS::PathElement::File")
 700     {
 701         my $id=$tail->{id};
 702         my $sql=("SELECT paths.name, files.name FROM files\n" .
 703                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 704                  "WHERE files.id=?\n" .
 705                  "GROUP BY paths.name, files.name");
 706         print "FILENAME SQL: $sql\n" if($self->{verbose});
 707         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 708         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 709         return($self->{db}->relativise($path, $name, $mountpoint));
 710     }
 711     die("DB::filename: unhandled case\n"); #FIXME
 712 }
 713
 714 sub tags_subselect
 715 {
 716     my($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     unless($self->{db}->{postgres})
 840     {
 841         @tags=map{ "\"$_\""; } @tags;
 842         @tags_vals=map( { [ map({ "\"$_\""; } @$_ ) ] } @tags_vals);
 843         $lasttag="\"$lasttag\"" if defined($lasttag);
 844     }
 845     return(\@tags, \@tags_vals, $lasttag);
 846 }
 847
 848 # we just filter $ALLTRACKS, $NOARTIST and $NOALBUM
 849 # filtering tags properly requires up to four levels of recursion
 850 # (tag/tagval/AND/NOT) and is too slow
 851 sub filter
 852 {
 853     my($self, @dirs)=@_;
 854     my $base=$self->{path};
 855     my @outdirs=();
 856     for my $dir (@dirs)
 857     {
 858         print "\nFILTER (",$self->state(), "): $base / $dir\n";
 859         if($self->empty("$base/$dir"))
 860         {
 861             print "empty: $base / $dir\n";
 862         }
 863         else
 864         {
 865             print "non-empty, accepting: $base / $dir\n";
 866             push(@outdirs, $dir);
 867         }
 868     }
 869     return(@outdirs);
 870 }
 871
 872 sub empty
 873 {
 874     my($self, $dir)=@_;
 875     my $path=ID3FS::Path->new($self->{db}, $dir, $self->{verbose},
 876                               ($self->{maxtagdepth} - $self->{curtagdepth}));
 877     return 1 unless($path->isvalid());
 878     my($subdirs,$subfiles)=$path->dirents();
 879     return 0 if(@$subfiles || @$subdirs);
 880     return 1;
 881 }
 882
 883 1;