Truncated base visitor class

visitor.py

class Visitor(object):

    CHILD_ATTRS = ['value', 'thenPart', 'elsePart', 'expression', 'body','exception', 'initializer', 'tryBlock', 'condition','update', 'iterator', 'object', 'setup', 'discriminant', 'finallyBlock', 'tryBlock', 'varDecl', 'target']

    def __init__(self, filepath):
        self.filepath = filepath
        #List of functions by line # and set of names
        self.functions = defaultdict(set)
        with open(filepath) as myFile:
            self.source = myFile.read()

        self.visited = list()
        self.root = jsparser.parse(self.source, self.filepath)
        self.initialize()
        self.visit(self.root)

    def initialize(self):
        pass

    def look4Childen(self, node):
        for attr in self.CHILD_ATTRS:
            child = getattr(node, attr, None)
            if isinstance(child, jsparser.Node):
                self.visit(child)

    def visit_ANY(self, node):

        pass

    def visit(self, root):
        if id(root) in self.visited: return
        self.visited.append(id(root))

        call = lambda n: getattr(self, "visit_%s" % n.type, self.visit_ANY)(n)
        call(root)
        self.look4Childen(root)
        for node in root:
            self.visit(node)