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williamc |
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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 TreeMonkey;
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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 $self=shift;
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$self->{currentnode)=shift;
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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 $found=0;
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# Split string
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($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}->name() ne $first ) ||
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( $self->{currentnode)->parent() ne "" ) ) {
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$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 ) && ( $self->{currentnode}->name() eq $first )) {
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$found=1;
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}
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# Now Search the child branches for the pattern
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my $n=0;
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my $i=0;
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while ( $found==0 && $n>=0 ) {
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$children=$self->{currentnode}->listbranch()) {
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$n=$#children;
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$branch=$children[$n]
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if ( $branch eq $words[$i] ) {
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$self->{currentnode}=$branch;
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$i++;
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if ( $n > $#words ) { $found=1; }
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}
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else {
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$n--;
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}
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} # end while
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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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