tidy to_sql()

[id3fs.git] / lib / ID3FS / Path / Node.pm

diff --git a/lib/ID3FS/Path/Node.pm b/lib/ID3FS/Path/Node.pm
index 08c2088..11e2de3 100644 (file)
--- a/lib/ID3FS/Path/Node.pm
+++ b/lib/ID3FS/Path/Node.pm
@@ -37,9 +37,9 @@ sub print
     my $op=$self->op();
     my $left=$self->left();
     my $right=$self->right();
-    return undef unless($left || $right);
+    return "" unless($left || $right);
     my $str .= $self->print_node($left);
-    $str .= " $op " if($op);
+    $str .= (" " . $op->{name} . " ") if($op);
     $str .= $self->print_node($right);
     if($op || ($left && $right))
     {
@@ -53,7 +53,98 @@ sub print_node
     my($self, $node)=@_;
     return "" unless(defined($node));
     return $node->print() if(ref($node) eq "ID3FS::Path::Node");
-    return $node;
+    return $node->{name};
+}
+
+sub to_sql
+{
+    my($self, $parent, @joins)=@_;
+    my @outjoins=();
+    # init
+    unless(@joins)
+    {
+       @outjoins = @joins = ("INNER");
+    }
+    my $left=$self->left();
+    my $right=$self->right();
+    return ("", @outjoins) unless($left || $right);
+    my ($leftstr, @leftjoins) = $self->node_to_sql($left, $parent, @joins);
+    push(@joins, @leftjoins);
+    push(@outjoins, @leftjoins);
+    my $op=$self->op();
+    if(defined($op))
+    {
+       if($op->{name} eq "AND")
+       {
+           push(@joins, "INNER");
+           push(@outjoins, "INNER");
+       }
+       elsif($op->{name} eq "NOT")
+       {
+           push(@joins, "LEFT");
+           push(@outjoins, "LEFT");
+       }
+    }
+    my ($rightstr, @rightjoins) = $self->node_to_sql($right, $parent, @joins);
+    push(@outjoins, @rightjoins);
+#    print "LEFT (", scalar(@leftjoins), "): $leftstr\n";
+#    print "RIGHT (", scalar(@rightjoins), "): $rightstr\n";
+    my $str=$leftstr;
+    $str .= (" " . $op->{name} . " ") if($op);
+    $str .= $rightstr;
+    if($op || ($left && $right))
+    {
+       $str="(" . $str . ")";
+    }
+#    print "STR: $str\n";
+    return($str, @outjoins);
+}
+
+sub node_to_sql
+{
+    my($self, $node, $parent, @joins)=@_;
+    return ("", ()) unless(defined($node));
+    return $node->to_sql($parent, @joins) if(ref($node) eq "ID3FS::Path::Node");
+    my $sql;
+    my $cnt=scalar(@joins)+1;
+    if(defined($node->{parents_id}))
+    {
+       $sql= "(t" . scalar(@joins) . ".parents_id='$node->{parents_id}'";
+       $sql .= " AND fxt" . scalar(@joins) . ".tags_id='" . $node->{id} . "')";
+    }
+    else
+    {
+       $sql= "(t" . scalar(@joins) .".parents_id=''";
+       $sql .= " AND fxt" . scalar(@joins) . ".tags_id='" . $node->{id} . "')";
+    }
+    return ($sql, ());
+}
+
+sub used_tags
+{
+    my($self)=@_;
+    my @used=(grep { defined; }  ($self->node_used_tags($self->left()),
+                                 $self->node_used_tags($self->right())));
+    return(@used);
+}
+
+sub node_used_tags
+{
+    my($self, $node)=@_;
+    return (undef) unless(defined($node));
+    return $node->used_tags() if(ref($node) eq "ID3FS::Path::Node");
+    if(defined($node->{parents_id}))
+    {
+       return([ $node->{parents_id}, $node->{id} ]);
+    }
+    return $node->{id};
+}
+
+
+sub max
+{
+    my($self, $a, $b)=@_;
+    return(($a > $b) ? $a : $b);
 }
 
 1;