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 sub new
  20 {
  21     my $proto=shift;
  22     my $class=ref($proto) || $proto;
  23     my $self={};
  24     bless($self,$class);
  25
  26     $self->{elements}=[];
  27     $self->{db}=shift;
  28     $self->{path}=shift;
  29     $self->parse();
  30 #    print "STATE: ", $self->state(), "\n";
  31     return $self;
  32 }
  33
  34 sub isdir
  35 {
  36     my($self)=@_;
  37     if(($self->state() == $STATE_FILE) ||
  38        ($self->state() == $STATE_INVALID))
  39     {
  40         return 0;
  41     }
  42     return 1;
  43 }
  44
  45 sub isfile
  46 {
  47     my($self)=@_;
  48     return 1 if($self->state() == $STATE_FILE);
  49     return 0;
  50 }
  51
  52 sub isvalid
  53 {
  54     my($self)=@_;
  55     return($self->state() != $STATE_INVALID);
  56 }
  57
  58 sub dest
  59 {
  60     my($self, $mountpoint)=@_;
  61     if($self->state() == $STATE_FILE)
  62     {
  63         return $self->filename($mountpoint, $self);
  64     }
  65     return "ERROR"; #should never happen?
  66 }
  67
  68 sub dirents
  69 {
  70     my($self)=@_;
  71     my @dents=();
  72     my $state=$self->state();
  73 #    print "DIRENTS: STATE: $state\n";
  74 #    print "DIRENTS: FILE: $self->{path}\n";
  75     if($state==$STATE_ALL)
  76     {
  77         push(@dents, qw(TRACKS NOARTIST), $self->artists());
  78     }
  79     elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
  80     {
  81         my $tag=$self->tail();
  82         if($state==$STATE_TAG &&
  83            defined($tag) &&
  84            ref($tag) eq "ID3FS::PathElement::Tag" &&
  85            $self->{db}->tag_has_values($tag->{id}))
  86         {
  87             @dents=$self->tags();
  88         }
  89         else
  90         {
  91             push(@dents, qw(AND OR TRACKS NOARTIST), $self->artists());
  92         }
  93     }
  94     elsif($state==$STATE_BOOLEAN)
  95     {
  96         my $parent=$self->tail();
  97         unless(defined($parent) &&
  98                ref($parent) eq "ID3FS::PathElement::Boolean" &&
  99                $parent->{name} eq "NOT")
 100         {
 101             push(@dents, "NOT");
 102         }
 103         push(@dents, $self->tags());
 104     }
 105     elsif($state==$STATE_ROOT)
 106     {
 107         @dents=(qw(ALL NOT), $self->tags());
 108     }
 109     elsif($state==$STATE_ALBUMS)
 110     {
 111         @dents=(qw(TRACKS NOALBUM),$self->albums());
 112     }
 113     elsif($state==$STATE_TRACKLIST)
 114     {
 115         @dents=$self->tracks();
 116     }
 117     else
 118     {
 119         print "DIRENTS: UNHANDLED STATE: $state\n";
 120     }
 121     return(@dents);
 122 }
 123
 124 sub parse
 125 {
 126     my($self)=@_;
 127     @{$self->{components}}=split(/\//, $self->{path});
 128     shift @{$self->{components}}; # drop empty field before leading /
 129 #    print "PATH: $self->{path}\n";
 130     $self->state($STATE_ROOT);
 131     return if($self->{path} eq "/");
 132     my @parts=@{$self->{components}};
 133     my($tag, $tagval);
 134     $self->{elements}=[];
 135     $self->{bare_not}=0;
 136     $self->{in_all}=0;
 137     my $root_not=0;
 138     my $tags_seen=0;
 139     while(defined(my $name=shift @parts))
 140     {
 141 #       print "NAME: $name\n";
 142         my $state=$self->state();
 143         if($state==$STATE_INVALID)
 144         {
 145 #           print "SM: INVALID: $name\n";
 146             return;
 147         }
 148         elsif($state==$STATE_ROOT)
 149         {
 150 #           print "SM: ROOT: $name\n";
 151             if($name eq "ALL")
 152             {
 153                 $self->{in_all}=1;
 154                 $self->state($STATE_ALL);
 155             }
 156             elsif($name eq "NOT")
 157             {
 158                 $root_not=1;
 159                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 160                 $self->state($STATE_BOOLEAN);
 161             }
 162             else
 163             {
 164                 $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 165                 if($tag)
 166                 {
 167                     push(@{$self->{elements}}, $tag);
 168                     $tags_seen++;
 169                     $self->state($STATE_TAG);
 170                 }
 171                 else
 172                 {
 173                     $self->state($STATE_INVALID);
 174                 }
 175             }
 176         }
 177         elsif($state==$STATE_TAG || $state==$STATE_TAGVAL)
 178         {
 179 #           print "SM: TAG/TAGVAL($state): $name\n";
 180             my $tag=$self->tail();
 181             if($state==$STATE_TAG &&
 182                defined($tag) &&
 183                ref($tag) eq "ID3FS::PathElement::Tag" &&
 184                $self->{db}->tag_has_values($tag->{id}))
 185             {
 186 #               print "Parsing: parent: $tag->{id}\n";
 187                 my $tagval=ID3FS::PathElement::Tag->new($self->{db}, $name, $tag->{id});
 188                 if(defined($tagval))
 189                 {
 190                     $self->state($STATE_TAGVAL);
 191                     # stay in tag state
 192                     push(@{$self->{elements}}, $tagval);
 193                 }
 194                 else
 195                 {
 196                     $self->state($STATE_INVALID);
 197                 }
 198             }
 199             elsif($name eq "TRACKS")
 200             {
 201                 $self->state($STATE_TRACKLIST);
 202             }
 203             elsif($name eq "NOARTIST")
 204             {
 205                 $self->state($STATE_TRACKLIST);
 206             }
 207             elsif($name eq "AND")
 208             {
 209                 $self->state($STATE_BOOLEAN);
 210                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 211             }
 212             elsif($name eq "OR")
 213             {
 214                 $self->state($STATE_BOOLEAN);
 215                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 216             }
 217             else
 218             {
 219                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 220                 if($artist)
 221                 {
 222                     push(@{$self->{elements}}, $artist);
 223                     $self->state($STATE_ALBUMS);
 224                 }
 225                 else
 226                 {
 227                     $self->state($STATE_INVALID);
 228                 }
 229             }
 230         }
 231         elsif($state==$STATE_BOOLEAN)
 232         {
 233 #           print "SM: BOOLEAN: $name\n";
 234             my $parent=$self->tail();
 235             my $allownot=1;
 236             if(defined($parent) &&
 237                ref($parent) eq "ID3FS::PathElement::Boolean" &&
 238                $parent->{name} eq "NOT")
 239             {
 240                 $allownot=0;
 241             }
 242             if($allownot && $name eq "NOT")
 243             {
 244                 $self->state($STATE_BOOLEAN);
 245                 push(@{$self->{elements}}, ID3FS::PathElement::Boolean->new($self->{db}, $name));
 246             }
 247             else
 248             {
 249                 my $tag=ID3FS::PathElement::Tag->new($self->{db}, $name);
 250                 if($tag)
 251                 {
 252                     push(@{$self->{elements}}, $tag);
 253                     $tags_seen++;
 254                     $self->state($STATE_TAG);
 255                 }
 256                 else
 257                 {
 258                     $self->state($STATE_INVALID);
 259                 }
 260             }
 261         }
 262         elsif($state==$STATE_ALBUMS)
 263         {
 264 #           print "SM: ALBUM: $name\n";
 265             if($name eq "TRACKS")
 266             {
 267                 $self->state($STATE_TRACKLIST);
 268             }
 269             elsif($name eq "NOALBUM")
 270             {
 271                 $self->state($STATE_TRACKLIST);
 272             }
 273             else
 274             {
 275                 my $album=ID3FS::PathElement::Album->new($self->{db}, $name);
 276                 if($album)
 277                 {
 278                     push(@{$self->{elements}}, $album);
 279                     $self->state($STATE_TRACKLIST);
 280                 }
 281                 else
 282                 {
 283                     $self->state($STATE_INVALID);
 284                 }
 285             }
 286         }
 287         elsif($state==$STATE_TRACKLIST)
 288         {
 289 #           print "SM: TRACKLIST: $name\n";
 290             my $track=ID3FS::PathElement::File->new($self->{db}, $name);
 291             if($track)
 292             {
 293                 push(@{$self->{elements}}, $track);
 294                 $self->state($STATE_FILE);
 295             }
 296             else
 297             {
 298                 $self->state($STATE_INVALID);
 299             }
 300         }
 301         elsif($state==$STATE_FILE)
 302         {
 303 #           print "SM: FILE: $name\n";
 304             # Can't have anything after a filename
 305             $self->state($STATE_INVALID);
 306         }
 307         elsif($state==$STATE_ALL)
 308         {
 309             if($name eq "TRACKS")
 310             {
 311                 $self->state($STATE_TRACKLIST);
 312             }
 313             elsif($name eq "NOARTIST")
 314             {
 315                 $self->state($STATE_TRACKLIST);
 316             }
 317             else
 318             {
 319                 my $artist=ID3FS::PathElement::Artist->new($self->{db}, $name);
 320                 if($artist)
 321                 {
 322                     push(@{$self->{elements}}, $artist);
 323                     $self->state($STATE_ALBUMS);
 324                 }
 325                 else
 326                 {
 327                     $self->state($STATE_INVALID);
 328                 }
 329             }
 330         }
 331         else
 332         {
 333             print "SM: ERROR: UNKNOWN STATE: $self->{state}\n";
 334             $self->state($STATE_INVALID);
 335         }
 336     }
 337
 338     print "ROOT_NOT: $root_not TAGS_SEEN: $tags_seen\n";
 339     if($root_not && ($tags_seen < 2))
 340     {
 341         $self->{bare_not}=1;
 342     }
 343
 344     # remove trailing boolean
 345     my @elements=@{$self->{elements}};
 346     while(@elements && ref($elements[$#elements]) eq "ID3FS::PathElement::Boolean")
 347     {
 348         pop @elements;
 349     }
 350     # sort elements by precedence
 351     @elements=$self->sort_elements(@elements);
 352     $self->{tagtree}=$self->elements_to_tree(\@elements);
 353     if($self->{tagtree})
 354     {
 355         ($self->{sqlconditions},
 356          $self->{joins}) = $self->{tagtree}->to_sql();
 357 #       print "TREE: ",  $self->{tagtree}->print(), "\n";
 358 #       print("SQL CONDITION(", scalar(@{$self->{joins}}), "): ",
 359 #             $self->{sqlconditions}, "\n");
 360 #       use Data::Dumper;
 361 #       print Dumper $self->{tagtree};
 362     }
 363 }
 364
 365 sub state
 366 {
 367     my($self, $newstate)=@_;
 368     $self->{state}=$newstate if(defined($newstate));
 369     return $self->{state};
 370 }
 371
 372 sub elements_to_tree
 373 {
 374     my($self, $elements)=@_;
 375     return undef unless(@$elements);
 376     my ($left, $right, $op)=(undef, undef, undef);
 377     my $thing=pop @$elements;
 378     if(ref($thing) eq "ID3FS::PathElement::Boolean")
 379     {
 380         my $op=$thing;
 381         $right=$self->elements_to_tree($elements);
 382         if($op->{name} ne "NOT")
 383         {
 384             $left=$self->elements_to_tree($elements);
 385         }
 386         return ID3FS::Path::Node->new($left, $op, $right);
 387     }
 388     else
 389     {
 390         return ID3FS::Path::Node->new($thing);
 391     }
 392 }
 393
 394 # Dijkstra's shunting-yard algorithm
 395 sub sort_elements
 396 {
 397     my ($self, @input)=@_;
 398     my @opstack=();
 399     my @output=();
 400 #    print "INPUT: ", join(', ', map { $_->{name}; } @input), "\n";
 401     while(my $thing = shift @input)
 402     {
 403         if(ref($thing) eq "ID3FS::PathElement::Tag")
 404         {
 405             # Handle tag values by dropping parent
 406             if(@input && ref($input[0]) eq "ID3FS::PathElement::Tag")
 407             {
 408                 $thing=shift @input;
 409             }
 410             push(@output, $thing);
 411         }
 412         elsif(ref($thing) eq "ID3FS::PathElement::Boolean")
 413         {
 414             # bool
 415             while(@opstack &&
 416                   ($priorities{$thing->{name}} <= $priorities{$opstack[$#opstack]->{name}}))
 417             {
 418                 push(@output, pop(@opstack));
 419             }
 420             push(@opstack, $thing);
 421         }
 422     }
 423     while(@opstack)
 424     {
 425         push(@output, pop(@opstack));
 426     }
 427 #    print "STACK: ", join(', ', map { $_->{name}; } @output), "\n";
 428     return @output;
 429 }
 430
 431 sub used_tags
 432 {
 433     my($self)=@_;
 434     return() unless(defined($self->{tagtree}));
 435     return($self->{tagtree}->used_tags());
 436 }
 437
 438 sub tag_has_values
 439 {
 440     my($self)=@_;
 441     my $tail=$self->tail();
 442     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 443     {
 444         return($self->{db}->tag_has_values($tail->{id}));
 445     }
 446 }
 447
 448 sub trailing_tag_id
 449 {
 450     my($self)=@_;
 451     my $tail=$self->tail();
 452     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 453     {
 454         return($tail->{id});
 455     }
 456     return undef;
 457 }
 458
 459 sub trailing_tag_parent
 460 {
 461     my($self)=@_;
 462     my $tail=$self->tail();
 463     if($tail && ref($tail) eq "ID3FS::PathElement::Tag")
 464     {
 465         return($tail->{parents_id});
 466     }
 467     return undef;
 468 }
 469
 470 sub tail
 471 {
 472     my($self)=@_;
 473     return($self->{elements}->[$#{$self->{elements}}]);
 474 }
 475
 476 # the one before last
 477 sub tail_parent
 478 {
 479     my($self)=@_;
 480     return($self->{elements}->[($#{$self->{elements}}) - 1]);
 481 }
 482
 483 ######################################################################
 484
 485 sub tags
 486 {
 487     my($self)=@_;
 488     if(!$self->{tagtree}) # / or /NOT
 489     {
 490         my $sql="SELECT DISTINCT name FROM tags WHERE parents_id='';";
 491         return($self->{db}->cmd_firstcol($sql));
 492     }
 493     my $hasvals=$self->tag_has_values();
 494     my $parent=$self->trailing_tag_parent();
 495 #    print "THASVALS: $hasvals\n";
 496 #    print "TPARENT: ", (defined($parent)? $parent : "NO"), "\n";
 497     my @ids=();
 498     my $sql=("SELECT tags.name FROM (\n" .
 499              $self->tags_subselect() .
 500              ") AS subselect\n" .
 501              "INNER JOIN files_x_tags ON subselect.files_id=files_x_tags.files_id\n" .
 502              "INNER JOIN tags ON files_x_tags.tags_id=tags.id\n");
 503     my @allused=$self->used_tags();
 504     my @used=grep { ref($_) ne "ARRAY"; } @allused;
 505     my @used_with_vals=grep { ref($_) eq "ARRAY"; } @allused;
 506 #    print "tags(): USED: ", join(", ", @used), "\n";
 507 #    print "tags(): USED_WITH_VALS: ", join(", ", map { "[".$_->[0]. ", ".$_->[1]."]";} @used_with_vals), "\n";
 508     my @orclauses=();
 509     my @andclauses=();
 510     my $id=$self->trailing_tag_id();
 511     if($hasvals)
 512     {
 513 #       print "HAS_VALUES\n";
 514         my @values=map { "'".$_->[1]."'"; } grep { $_->[0] == $id; } @used_with_vals;
 515         my $clause="(tags.parents_id='$id'";
 516         if(@values)
 517         {
 518             $clause .= " AND tags.id NOT IN (" . join(', ', @values) . ")";
 519         }
 520         $clause .= ")";
 521         push(@andclauses, $clause);
 522     }
 523     else
 524     {
 525 #       print "HASNT VALUES\n";;
 526         if(@used)
 527         {
 528             push(@andclauses, "(NOT (tags.parents_id='' AND tags.id IN (" . join(', ', @used) . ")))");
 529         }
 530         for my $pair (@used_with_vals)
 531         {
 532             push(@andclauses, "(NOT (tags.parents_id='" . $pair->[0] . "' AND tags.id='" . $pair->[1] . "'))");
 533         }
 534     }
 535
 536     my $parentclause= "(tags.parents_id='";
 537     if($hasvals)
 538     {
 539         $parentclause .= $id;
 540     }
 541     elsif($parent)
 542     {
 543         $parentclause .= $parent;
 544     }
 545     $parentclause .= "')";
 546     push(@andclauses, $parentclause);
 547
 548     if(@orclauses)
 549     {
 550         push(@andclauses, '( ' . join(' OR ', @orclauses) . ' )');
 551     }
 552     if(@andclauses)
 553     {
 554         $sql .= "WHERE " . join(' AND ', @andclauses) . "\n";
 555     }
 556     $sql .= "GROUP BY tags.name;";
 557     print "SQL(TAGS): $sql\n";
 558     my @tagnames=$self->{db}->cmd_firstcol($sql);
 559     print "SUBNAMES: ", join(', ', @tagnames), "\n";
 560     return(@tagnames);
 561 }
 562
 563 sub tag_values
 564 {
 565     my($self, $tagid)=@_;
 566     my $sql=("SELECT DISTINCT name FROM tags\n" .
 567              "WHERE parents_id=?");
 568     my @tags=$self->{db}->cmd_firstcol($sql, $tagid);
 569     @tags=map { length($_) ? $_ : "NOVALUE"; } @tags;
 570     return @tags;
 571 }
 572
 573 sub artists
 574 {
 575     my($self)=@_;
 576     if(!@{$self->{elements}}) # /ALL
 577     {
 578         my $sql="SELECT DISTINCT name FROM artists WHERE name!='';";
 579         return($self->{db}->cmd_firstcol($sql));
 580     }
 581     my @ids=();
 582     my $sql=("SELECT artists.name FROM (\n" .
 583              $self->tags_subselect() .
 584              ") AS subselect\n" .
 585              "INNER JOIN files ON subselect.files_id=files.id\n" .
 586              "INNER JOIN artists ON files.artists_id=artists.id\n" .
 587              "WHERE artists.name != ''\n" .
 588              "GROUP BY artists.name;");
 589     print "SQL(ARTISTS): $sql\n";
 590     my @tagnames=$self->{db}->cmd_firstcol($sql);
 591     print "ARTISTS: ", join(', ', @tagnames), "\n";
 592     return(@tagnames);
 593 }
 594
 595 sub albums
 596 {
 597     my($self)=@_;
 598     my @ids=();
 599     my $tail=$self->tail();
 600     # FIXME: rework PathElements
 601     if(ref($tail) eq "ID3FS::PathElement::Artist")
 602     {
 603         return $self->artist_albums($tail->{id});
 604     }
 605     my $sql;
 606     if($self->{in_all})
 607     {
 608         $sql="SELECT name FROM albums";
 609     }
 610     else
 611     {
 612         $sql=("SELECT albums.name\n" .
 613               "\tFROM (\n" .
 614               $self->tags_subselect() .
 615               "\t) AS subselect\n" .
 616               "INNER JOIN files ON subselect.files_id=files.id\n" .
 617               "INNER JOIN albums ON files.albums_id=albums.id\n" .
 618               "WHERE albums.name != ''\n" .
 619               "GROUP BY albums.name;");
 620     }
 621     print "SQL(ALBUMS): \n$sql\n";
 622     my @names=$self->{db}->cmd_firstcol($sql);
 623     print "ALBUMS: ", join(', ', @names), "\n";
 624     return(@names);
 625 }
 626
 627 sub artist_albums
 628 {
 629     my($self, $artist_id)=@_;
 630     my $sql="SELECT albums.name FROM ";
 631     if($self->{in_all})
 632     {
 633         $sql .= "files\n";
 634     }
 635     else
 636     {
 637         $sql .= ("(\n" .
 638                  $self->tags_subselect() .
 639                  ") AS subselect\n" .
 640                  "INNER JOIN files ON subselect.files_id=files.id\n");
 641     }
 642     $sql .= ("INNER JOIN albums ON albums.id=files.albums_id\n" .
 643              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 644              "WHERE artists.id=? and albums.name <> ''\n" .
 645              "GROUP BY albums.name\n");
 646     print "ARTIST_ALBUMS SQL: $sql\n";
 647     my @albums=$self->{db}->cmd_firstcol($sql, $artist_id);
 648     print "ALBUMS: ", join(', ', @albums), "\n";
 649     return(@albums);
 650 }
 651
 652 sub artist_tracks
 653 {
 654     my($self, $artist_id)=@_;
 655     my $sql="SELECT files.name FROM ";
 656     if($self->{in_all})
 657     {
 658         $sql .= "files\n";
 659     }
 660     else
 661     {
 662         $sql .= ("(\n" .
 663                  $self->tags_subselect() .
 664                  "\t) AS subselect\n" .
 665                  "INNER JOIN files ON subselect.files_id=files.id\n");
 666     }
 667     $sql .= ("INNER JOIN artists ON artists.id=files.artists_id\n" .
 668              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 669              "WHERE artists.id=? AND albums.name=''\n" .
 670              "GROUP BY files.name\n");
 671     print "ARTIST_TRACKS SQL: $sql\n";
 672     my @names=$self->{db}->cmd_firstcol($sql, $artist_id);
 673     print "ARTISTTRACKS: ", join(', ', @names), "\n";
 674     return(@names);
 675 }
 676
 677 sub album_tracks
 678 {
 679     my($self, $artist_id, $album_id)=@_;
 680     my $sql=("SELECT files.name FROM files\n" .
 681              "INNER JOIN albums  ON albums.id=files.albums_id\n" .
 682              "INNER JOIN artists ON artists.id=files.artists_id\n" .
 683              "WHERE artists.id=? AND albums.id=?\n" .
 684              "GROUP BY files.name\n");
 685     print "ALBUM_TRACKS SQL($artist_id, $album_id): $sql\n";
 686     my @names=$self->{db}->cmd_firstcol($sql, $artist_id, $album_id);
 687     print "TRACKS: ", join(', ', @names), "\n";
 688     return(@names);
 689 }
 690
 691 sub tracks
 692 {
 693     my($self)=@_;
 694     # FIXME: rework PathElements
 695     my $tail=$self->tail();
 696     if(ref($tail) eq "ID3FS::PathElement::Artist")
 697     {
 698         return $self->artist_tracks($tail->{id});
 699     }
 700     elsif(ref($tail) eq "ID3FS::PathElement::Album")
 701     {
 702         my $artist_id=0;
 703         my $artist=$self->tail_parent();
 704         if(defined($artist) && (ref($artist) eq "ID3FS::PathElement::Artist"))
 705         {
 706             # should always happen
 707             $artist_id=$artist->{id};
 708         }
 709         return $self->album_tracks($artist_id, $tail->{id});
 710     }
 711     my $sql="SELECT files.name FROM ";
 712     if($self->{in_all})
 713     {
 714         $sql .= "files\n";
 715     }
 716     else
 717     {
 718         $sql .= ("(\n" .
 719                  $self->tags_subselect() .
 720                  ") AS subselect\n" .
 721                  "INNER JOIN files ON files.id=subselect.files_id\n");
 722     }
 723     $sql .= "INNER JOIN artists ON files.artists_id=artists.id\n";
 724     if($self->{components}->[$#{$self->{components}}] eq "NOARTIST")
 725     {
 726         $sql .= "WHERE artists.name =''\n";
 727     }
 728     $sql .= "GROUP BY files.name;";
 729     print "TRACKS SQL($self->{path}): $sql\n";
 730     my @names=$self->{db}->cmd_firstcol($sql);
 731     print "TRACKS: ", join(', ', @names), "\n";
 732     return(@names);
 733 }
 734
 735 sub filename
 736 {
 737     my($self, $mountpoint)=@_;
 738     my $tail=$self->tail();
 739     if(ref($tail) eq "ID3FS::PathElement::File")
 740     {
 741         my $id=$tail->{id};
 742         my $sql=("SELECT paths.name, files.name FROM files\n" .
 743                  "INNER JOIN paths ON files.paths_id=paths.id\n" .
 744                  "WHERE files.id=?\n" .
 745                  "GROUP BY paths.name, files.name");
 746         print "FILENAME SQL: $sql\n";
 747         my ($path, $name)=$self->{db}->cmd_onerow($sql, $id);
 748         my $id3fs_path=join('/', map { $_->{name}; }  @{$self->{elements}});
 749         return($self->{db}->relativise($path, $name, $mountpoint, $id3fs_path));
 750     }
 751     die("DB::filename: unhandled case\n"); #FIXME
 752 }
 753
 754 sub tags_subselect
 755 {
 756     my($self)=@_;
 757     # we need to specially handle a bare /NOT/tag with no other clauses,
 758     # using a simple WHERE id !='tagid' instead of a LEFT JOIN
 759     if($self->{bare_not})
 760     {
 761         return $self->bare_not_subselect();
 762     }
 763     if($self->{in_all})
 764     {
 765         return "\tSELECT id FROM files AS files_id\n";
 766     }
 767     my $tree=$self->{tagtree};
 768     my $hasvals=$self->tag_has_values();
 769     my $parent=$self->trailing_tag_parent();
 770
 771 #    print "ELEMENTS: ", join('/', map { $_->{name}; } @{$self->{elements}}), "\n";
 772 #    print "TREE: ", $tree->print(), "\n";
 773     my $tag=undef;
 774     if($hasvals)
 775     {
 776         $tag=$self->trailing_tag_id();
 777 #       print "Trailing id: $tag\n";
 778     }
 779     my ($sqlclause, @joins)=(undef, ());
 780     ($sqlclause, @joins) = $tree->to_sql() if($tree);
 781 #    print "SQL(" . scalar(@joins) .": $sqlclause\n";
 782     my $sql="\tSELECT fxt1.files_id FROM tags t1";
 783     my @crosses=();
 784     my @inners=();
 785 #    $joinsneeded++ if($tag);
 786     for(my $i=0; $i <= $#joins; $i++)
 787     {
 788         my $cnt=$i+1;
 789         my $join=$joins[$i];
 790         my $inner=("\t$join JOIN files_x_tags fxt$cnt ON " .
 791                    "t${cnt}.id=fxt${cnt}.tags_id");
 792         if($i > 0)
 793         {
 794             push(@crosses, "CROSS JOIN tags t$cnt");
 795             $inner .= " AND fxt1.files_id=fxt${cnt}.files_id";
 796         }
 797         push(@inners, $inner);
 798     }
 799     $sql .= ("\n\t" . join(" ", @crosses)) if(@crosses);
 800     $sql .= ("\n" . join("\n", @inners)) if(@inners);
 801     $sql .= "\n\tWHERE $sqlclause" if($sqlclause);
 802 #    if($tag)
 803 #    {
 804 #       $sql .= " AND t${joinsneeded}.parents_id='$tag'";
 805 #    }
 806     $sql .= "\n\tGROUP BY fxt1.files_id\n";
 807     return $sql;
 808 }
 809
 810 sub bare_not_subselect
 811 {
 812     my($self)=@_;
 813     my @tags=grep { ref($_) eq "ID3FS::PathElement::Tag"; } @{$self->{elements}};
 814     my $sql=("\tSELECT f1.id AS files_id FROM files f1 WHERE f1.id NOT IN (\n" .
 815              "\t\tSELECT fxt1.files_id FROM tags t1\n" .
 816              "\t\tINNER JOIN files_x_tags fxt1 ON t1.id=fxt1.tags_id\n" .
 817              "\t\tWHERE ");
 818     if(scalar(@tags) > 1)
 819     {
 820         $sql .= ("(t1.parents_id='" . $tags[0]->{id} . "' AND t1.id='" .
 821                  $tags[1]->{id} . "')");
 822     }
 823     else
 824     {
 825         $sql .= ("(t1.parents_id='' AND t1.id='" . $tags[0]->{id} . "')");
 826     }
 827     $sql .= "\n\t\tGROUP BY fxt1.files_id\n\t)\n";
 828     return($sql);
 829 }
 830
 831 sub tags_subselect_and_not
 832 {
 833     my($self,@constraints)=@_;
 834     my ($tags, $tags_vals, $parent)=$self->constraints_tag_list(@constraints);
 835     my @tags=@$tags;
 836     my @tags_vals=@$tags_vals;;
 837     my $cnt=1;
 838     my @andclauses=();
 839     my $sql='';
 840     for my $tag (@tags)
 841     {
 842         if($cnt == 1)
 843         {
 844             $sql="\tSELECT fxt" . scalar(@tags) . ".files_id FROM files_x_tags fxt1\n";
 845             push(@andclauses, "\t\tfxt${cnt}.tags_id=$tag");
 846         }
 847         else
 848         {
 849             $sql .= ("\tLEFT JOIN files_x_tags fxt$cnt ON fxt" .
 850                  ($cnt-1) . ".files_id=fxt${cnt}.files_id\n");
 851             push(@andclauses, "\t\tfxt${cnt}.tags_id IS NULL");
 852         }
 853         print "AND: @andclauses\n";
 854         $cnt++;
 855     }
 856     if(@andclauses)
 857     {
 858         $sql .= "\tWHERE\n\t\t";
 859         $sql .= join(" AND\n\t\t", @andclauses) . "\n";
 860     }
 861     $sql .= "\tGROUP BY fxt". scalar(@tags).".files_id\n";
 862     return $sql;
 863 }
 864
 865
 866 sub tags_subselect_and
 867 {
 868     my($self,@constraints)=@_;
 869     my ($tags, $tags_vals, $parent)=$self->constraints_tag_list(@constraints);
 870     my @tags=@$tags;
 871     my @tags_vals=@$tags_vals;;
 872     my $cnt=1;
 873     my @andclauses=();
 874     my $sql='';
 875     for my $tag (@tags)
 876     {
 877         if($cnt == 1)
 878         {
 879             $sql="\tSELECT fxt" . scalar(@tags) . ".files_id FROM files_x_tags fxt1\n";
 880         }
 881         else
 882         {
 883             $sql .= ("\tINNER JOIN files_x_tags fxt$cnt ON fxt" .
 884                  ($cnt-1) . ".files_id=fxt${cnt}.files_id\n");
 885         }
 886         push(@andclauses, "\t\tfxt${cnt}.tags_id = $tag");
 887         print "AND: @andclauses\n";
 888         $cnt++;
 889     }
 890     if(@andclauses)
 891     {
 892         $sql .= "\tWHERE\n\t\t";
 893         $sql .= join(" AND\n\t\t", @andclauses) . "\n";
 894     }
 895     $sql .= "\tGROUP BY fxt". scalar(@tags).".files_id\n";
 896     return $sql;
 897 }
 898
 899 sub tags_subselect_or
 900 {
 901     my($self,@constraints)=@_;
 902     my ($tags, $tags_vals, $parent)=$self->constraints_tag_list(@constraints);
 903     my @tags=@$tags;
 904     my @tags_vals=@$tags_vals;;
 905
 906     my $sql=("\tSELECT files_x_tags.files_id FROM tags t1\n" .
 907              "\tINNER JOIN files_x_tags ON t1.id=files_x_tags.tags_id\n");
 908     my @orclauses=();
 909     my @andclauses=();
 910     # FIXME: and / or?
 911     if(@tags)
 912     {
 913         push(@andclauses, "( t1.parents_id=" . (defined($parent) ? $parent : "''") . " )");
 914         push(@andclauses, "( t1.id IN ( " . join(', ', @tags) ." ) )");
 915     }
 916     for my $pair (@tags_vals)
 917     {
 918         my($tag, $val)=@$pair;
 919         push(@orclauses, "( t1.parents_id=$tag AND t1.id=$val )");
 920     }
 921 #    push(@andclauses, "( t1.parents_id=" . (defined($parent) ? $parent : "''") . " )");
 922     if(@orclauses)
 923     {
 924         push(@andclauses, join("\n\t\tOR ", @orclauses));
 925     }
 926     if(@andclauses)
 927     {
 928         $sql .= "\tWHERE\n\t\t";
 929         $sql .= join("\n\t\tAND ", @andclauses) . "\n";
 930     }
 931     $sql .= "\tGROUP BY files_x_tags.files_id\n";
 932     return $sql;
 933 }
 934
 935 sub constraints_tag_list
 936 {
 937     my($self, @constraints)=@_;
 938     my $lasttag=undef;
 939     my @tags=();
 940     my @tags_vals=();
 941     for my $constraint (@constraints)
 942     {
 943 #       print ref($constraint), ": ", $constraint->{name}, "\n";
 944         if(ref($constraint) eq "ID3FS::PathElement::Tag")
 945         {
 946             if(defined($lasttag))
 947             {
 948 #               print "TAGVAL\n";
 949                 push(@tags_vals, [$lasttag, $constraint->{id}]) if defined($constraint->{id});
 950                 $lasttag=undef;
 951             }
 952             elsif($self->tag_has_values($constraint->{id}))
 953             {
 954 #               print "HASVALUES\n";
 955                 $lasttag=$constraint->{id} if defined($constraint->{id});
 956             }
 957             else
 958             {
 959 #               print "NOVALUES\n";
 960                 push(@tags, $constraint->{id}) if(defined($constraint->{id}));
 961             }
 962         }
 963     }
 964     unless($self->{db}->{postgres})
 965     {
 966         @tags=map{ "\"$_\""; } @tags;
 967         @tags_vals=map( { [ map({ "\"$_\""; } @$_ ) ] } @tags_vals);
 968         $lasttag="\"$lasttag\"" if defined($lasttag);
 969     }
 970     return(\@tags, \@tags_vals, $lasttag);
 971 }
 972
 973
 974 sub bare_tags
 975 {
 976     my($self)=@_;
 977     my $sql=("SELECT tags.name FROM tags\n" .
 978              "WHERE tags.parents_id=''\n" .
 979              "GROUP BY tags.name\n");
 980     my @names=$self->{db}->cmd_firstcol($sql);
 981     return (@names);
 982 }
 983
 984 sub tags_with_values
 985 {
 986     # FIXME: only shows one level of tag depth
 987     my($self)=@_;
 988     my $sql=("SELECT p.name, t.name  FROM tags t\n" .
 989              "INNER JOIN tags p ON t.parents_id=p.id\n" .
 990              "GROUP BY p.name, t.name\n");
 991     print "SQL: $sql\n";
 992     my $result=$self->{db}->cmd_rows($sql);
 993     my $tags={};
 994     for my $pair (@$result)
 995     {
 996         push(@{$tags->{$pair->[0]}}, $pair->[1]);
 997     }
 998     return $tags;
 999 }
1000
1001 1;