genshistream.py 文件源码

def __iter__(self):
        depth = 0
        ignore_until = None
        previous = None
        for event in self.tree:
            if previous is not None:
                if previous[0] == START:
                    depth += 1
                if ignore_until <= depth:
                    ignore_until = None
                if ignore_until is None:
                    for token in self.tokens(previous, event):
                        yield token
                        if token["type"] == "EmptyTag":
                            ignore_until = depth
                if previous[0] == END:
                    depth -= 1
            previous = event
        if previous is not None:
            if ignore_until is None or ignore_until <= depth:
                for token in self.tokens(previous, None):
                    yield token
            elif ignore_until is not None:
                raise ValueError("Illformed DOM event stream: void element without END_ELEMENT")