Get the start state for a specific precedence value.
@param precedence The current precedence.
@return The start state corresponding to the specified precedence, or
{@code null} if no start state exists for the specified precedence.
@throws IllegalStateException if this is not a precedence DFA.
@see #isPrecedenceDfa()
Get the start state for a specific precedence value.
@param precedence The current precedence. @return The start state corresponding to the specified precedence, or {@code null} if no start state exists for the specified precedence.
@throws IllegalStateException if this is not a precedence DFA. @see #isPrecedenceDfa()