def blockIndentation(block):
            text = block.text()
            return text[:len(text) - len(text.lstrip())]
def get_leafs(self):
		if self.lchild == None and self.rchild == None:
			return [self.leaf]
		else:
			return self.lchild.get_leafs()+self.rchild.get_leafs()