def __init__(self, patterns, ignore_patterns=None, suffixes=["<STR_LIT>"],<EOL>line_regex=_base_path):
super(TreeHandler, self).__init__(patterns, ignore_patterns, suffixes)<EOL>self.line_regex = re.compile(line_regex)<EOL>self.parents = {}  <EOL>self.children = {}<EOL>
Creates a new tree handler. `line_regex` is a regex that determines
        whether a file is self-sufficient or must be included in one (or more)
        files.