public XSCMBinOp(int type, CMNode leftNode, CMNode rightNode) { super(type); // Insure that its one of the types we require if ((type() != XSModelGroupImpl.MODELGROUP_CHOICE) && (type() != XSModelGroupImpl.MODELGROUP_SEQUENCE)) { throw new RuntimeException("ImplementationMessages.VAL_BST"); } // Store the nodes and init any data that needs it fLeftChild = leftNode; fRightChild = rightNode; }
public boolean isNullable() { // // If its an alternation, then if either child is nullable then // this node is nullable. If its a concatenation, then both of // them have to be nullable. // if (type() == XSModelGroupImpl.MODELGROUP_CHOICE) return (fLeftChild.isNullable() || fRightChild.isNullable()); else if (type() == XSModelGroupImpl.MODELGROUP_SEQUENCE) return (fLeftChild.isNullable() && fRightChild.isNullable()); else throw new RuntimeException("ImplementationMessages.VAL_BST"); }
protected void calcFirstPos(CMStateSet toSet) { if (type() == XSModelGroupImpl.MODELGROUP_CHOICE) { // Its the the union of the first positions of our children. toSet.setTo(fLeftChild.firstPos()); toSet.union(fRightChild.firstPos()); } else if (type() == XSModelGroupImpl.MODELGROUP_SEQUENCE) { // // If our left child is nullable, then its the union of our // children's first positions. Else is our left child's first // positions. // toSet.setTo(fLeftChild.firstPos()); if (fLeftChild.isNullable()) toSet.union(fRightChild.firstPos()); } else { throw new RuntimeException("ImplementationMessages.VAL_BST"); } }
protected void calcLastPos(CMStateSet toSet) { if (type() == XSModelGroupImpl.MODELGROUP_CHOICE) { // Its the the union of the first positions of our children. toSet.setTo(fLeftChild.lastPos()); toSet.union(fRightChild.lastPos()); } else if (type() == XSModelGroupImpl.MODELGROUP_SEQUENCE) { // // If our right child is nullable, then its the union of our // children's last positions. Else is our right child's last // positions. // toSet.setTo(fRightChild.lastPos()); if (fRightChild.isNullable()) toSet.union(fLeftChild.lastPos()); } else { throw new RuntimeException("ImplementationMessages.VAL_BST"); } }