isActive property
Whether the delimiter is active.
Links cannot be nested, so we must "deactivate" any pending ones. For example, take the following text:
Text [link and [more](links)](links).
Once we have parsed Text [, there is one (pending) link in the state
stack. It is, by default, active. Once we parse the next possible link,
[more](links), as a real link, we must deactive the pending links (just
the one, in this case).
Implementation
abstract bool isActive;