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