If this Terminal is of type 'TYPE_BRACKET', 'TYPE_SQUARE' or 'TYPE_BRACE', override this method so that it returns the Grammar that should be used to parse the contents of any brackets that are accepted by this Terminal.
Returns 'true' if 'opening' is an open round bracket and 'closing' is a close round bracket, or if 'opening' is an open square bracket and 'closing' is a close square bracket, or if 'opening' is an open brace and 'closing' is a close brace.
An NDFA describing the grammar of the contents of the bracket, if this is a 'bracket shift' Transition and its NDFA has already been calculated, or 'null' if this is not a 'bracket shift' Transition or the value has not yet been calculated.
ndfa -
Variable in class org.sc3d.apt.sss.v3.Parser
An NDFA that represents the grammar passed to the constructor and used by 'parse()'.