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/* Generated By:JJTree: Do not edit this line. src/bsh/JJTParserState.java */
package bsh;
class JJTParserState {
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;
JJTParserState() {
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;
}
}
}
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