fix: Allow CommonTokenStream to reset properly #4245
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- There is a flag in CommonTokenStream that indicates whether EOF has
already been fetched/seen. This was not being reset when a new TokenSource
was given to an existing CommonTokenStream and there was no Reset() function
which was unfortunately not exported and not part of the interface for TokenStream.
- Reset the flag when a new source is provided
- Export the Reset() function so that a TokenStream can be rewound
Signed-off-by: Jim.Idle <jimi@idle.ws>
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fix: Implement Reset in TokenStream interface and fix both it and SetTokenSource
ping: @parrt