package application.pen;
/* Generated By:JJTree: Do not edit this line. JJTIntVParserState.java */

class JJTIntVParserState {
  private java.util.Stack nodes;
  private java.util.Stack marks;

  private int sp;		// number of nodes on stack
  private int mk;		// current mark
  private boolean node_created;

  JJTIntVParserState() {
	nodes = new java.util.Stack();
	marks = new java.util.Stack();
	sp = 0;
	mk = 0;
  }

  /* Determines whether the current node was actually closed and
	 pushed.  This should only be called in the final user action of a
	 node scope.  */
  boolean nodeCreated() {
	return node_created;
  }

  /* Call this to reinitialize the node stack.  It is called
	 automatically by the parser's ReInit() method. */
  void reset() {
	nodes.removeAllElements();
	marks.removeAllElements();
	sp = 0;
	mk = 0;
  }

  /* Returns the root node of the AST.  It only makes sense to call
	 this after a successful parse. */
  Node rootNode() {
	return (Node)nodes.elementAt(0);
  }

  /* Pushes a node on to the stack. */
  void pushNode(Node n) {
	nodes.push(n);
	++sp;
  }

  /* Returns the node on the top of the stack, and remove it from the
	 stack.  */
  Node popNode() {
	if (--sp < mk) {
	  mk = ((Integer)marks.pop()).intValue();
	}
	return (Node)nodes.pop();
  }

  /* Returns the node currently on the top of the stack. */
  Node peekNode() {
	return (Node)nodes.peek();
  }

  /* Returns the number of children on the stack in the current node
	 scope. */
  int nodeArity() {
	return sp - mk;
  }


  void clearNodeScope(Node n) {
	while (sp > mk) {
	  popNode();
	}
	mk = ((Integer)marks.pop()).intValue();
  }


  void openNodeScope(Node n) {
	marks.push(new Integer(mk));
	mk = sp;
	n.jjtOpen();
  }


  /* A definite node is constructed from a specified number of
	 children.  That number of nodes are popped from the stack and
	 made the children of the definite node.  Then the definite node
	 is pushed on to the stack. */
  void closeNodeScope(Node n, int num) {
	mk = ((Integer)marks.pop()).intValue();
	while (num-- > 0) {
	  Node c = popNode();
	  c.jjtSetParent(n);
	  n.jjtAddChild(c, num);
	}
	n.jjtClose();
	pushNode(n);
	node_created = true;
  }


  /* A conditional node is constructed if its condition is true.  All
	 the nodes that have been pushed since the node was opened are
	 made children of the the conditional node, which is then pushed
	 on to the stack.  If the condition is false the node is not
	 constructed and they are left on the stack. */
  void closeNodeScope(Node n, boolean condition) {
	if (condition) {
	  int a = nodeArity();
	  mk = ((Integer)marks.pop()).intValue();
	  while (a-- > 0) {
	Node c = popNode();
	c.jjtSetParent(n);
	n.jjtAddChild(c, a);
	  }
	  n.jjtClose();
	  pushNode(n);
	  node_created = true;
	} else {
	  mk = ((Integer)marks.pop()).intValue();
	  node_created = false;
	}
  }
}