Compute set of tokens that can follow {@code s} in the ATN in the
specified {@code ctx}.
<p>If {@code ctx} is {@code null} and the end of the rule containing
{@code s} is reached, {@link Token#EPSILON} is added to the result set.
If {@code ctx} is not {@code null} and the end of the outermost rule is
reached, {@link Token#EOF} is added to the result set.</p>
@param s the ATN state
@param stopState the ATN state to stop at. This can be a
{@link BlockEndState} to detect epsilon paths through a closure.
@param ctx the complete parser context, or {@code null} if the context
should be ignored
@return The set of tokens that can follow {@code s} in the ATN in the
specified {@code ctx}.
Compute set of tokens that can follow {@code s} in the ATN in the specified {@code ctx}.
<p>If {@code ctx} is {@code null} and the end of the rule containing {@code s} is reached, {@link Token#EPSILON} is added to the result set. If {@code ctx} is not {@code null} and the end of the outermost rule is reached, {@link Token#EOF} is added to the result set.</p>
@param s the ATN state @param stopState the ATN state to stop at. This can be a {@link BlockEndState} to detect epsilon paths through a closure. @param ctx the complete parser context, or {@code null} if the context should be ignored
@return The set of tokens that can follow {@code s} in the ATN in the specified {@code ctx}.