我们添加了很多类似快捷键的功能，如基于当前气泡的位置弹出搜索框以方便打开新函数，查找定义，等等。
This led us to add things like shortcuts to bring up the search box next to the current bubble to easily open a new function side-by-side, go to definition, etc.
每次打开或关闭一个标记时，或者每次解析器看到文本时，就用节点或文本的信息回调用户定义的函数。
Every time a tag is opened or closed, or any time the parser sees some text, it makes callbacks to some user-defined functions with the node or text information.
该函数也会正确地处理未定义的值，尽管在警告打开时，常规表达式在匹配未定义的值时会输出警告信息。
It works correctly with undefined values as well, whereas with warnings turned on, a regular expression match on an undefined value will print a warning.
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