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#
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# TreeMonkey - Climb around the tree as directed by a search string
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#
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# Interface
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# -----------
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# new() : A new monkey is born
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# find(string) : Tell the monkey to search the tree for the node at the
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# location indicated by the string, relative to the current
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# tree node.
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# goto(TreeNode) : Tell the monkey to go to a particular node in the tree
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package ActiveDoc::TreeMonkey;
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require 5.001;
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use Utilities::ListIterator;
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sub new {
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my $class=shift;
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$self={};
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bless $self, $class;
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return $self;
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}
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sub goto {
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my $self=shift;
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my $node=shift;
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$self->{currentnode}=$node;
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}
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sub find {
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my $self=shift;
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my $string=shift;
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my @words;
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my $first;
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my $found=0;
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my $branch="";
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# Split string
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($first, @words)=split '/', $string;
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# Search towards root for first word or until we reach root
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while ( ( $self->{currentnode}->parent() ne '/' ) &&
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( $self->{currentnode}->name() ne $first ) ) {
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$self->{currentnode}=$self->{currentnode}->parent();
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}
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# Check the case of just a single word
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if (( $#words < 0 )) {
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if (( $self->{currentnode}->name() eq $first )) {
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$found=1;
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}
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}
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else { #if we have some more words...
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$f=1;
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$n=0;
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while ( ($f!=0) && ( $n < $#words ) ) {
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my $branchlist=$self->{currentnode}->nodeList();
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$f=$self->_checklist($words[$n],$branchlist);
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$n++;
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print $n." ".$f."\n";
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}
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$found=$f;
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}
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# Now Search the child branches for the pattern
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# Now return the object ID of the found node or null
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if ( $found==1 ) {
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return $self->{currentnode};
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}
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else {
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return "";
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}
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}
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# ------------------------ Support Routines ------------------------------
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sub _checklist {
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my $self=shift;
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my $word=shift;
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my $branchlist=shift;
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my $bit;
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my $branch;
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my $found=0;
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$bit=ListIterator->new($branchlist);
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while ( ($found==0) && ( ! $bit->last() ) ) {
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$branch=$bit->next();
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if ( $branch->name() eq $word) {
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$self->{currentnode}=$branch;
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$found=1;
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}
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} # end while
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return $found;
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}
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