123 lines
3.1 KiB
Java
123 lines
3.1 KiB
Java
/* Generated By:JJTree: Do not edit this line. JJTEcmaScriptState.java */
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package FESI.AST;
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public class JJTEcmaScriptState {
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private java.util.Stack nodes;
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private java.util.Stack marks;
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private int sp; // number of nodes on stack
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private int mk; // current mark
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private boolean node_created;
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public JJTEcmaScriptState() {
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nodes = new java.util.Stack();
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marks = new java.util.Stack();
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sp = 0;
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mk = 0;
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}
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/* Determines whether the current node was actually closed and
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pushed. This should only be called in the final user action of a
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node scope. */
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public boolean nodeCreated() {
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return node_created;
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}
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/* Call this to reinitialize the node stack. It is called
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automatically by the parser's ReInit() method. */
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public void reset() {
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nodes.removeAllElements();
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marks.removeAllElements();
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sp = 0;
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mk = 0;
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}
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/* Returns the root node of the AST. It only makes sense to call
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this after a successful parse. */
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public Node rootNode() {
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return (Node)nodes.elementAt(0);
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}
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/* Pushes a node on to the stack. */
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public void pushNode(Node n) {
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nodes.push(n);
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++sp;
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}
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/* Returns the node on the top of the stack, and remove it from the
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stack. */
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public Node popNode() {
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if (--sp < mk) {
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mk = ((Integer)marks.pop()).intValue();
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}
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return (Node)nodes.pop();
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}
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/* Returns the node currently on the top of the stack. */
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public Node peekNode() {
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return (Node)nodes.peek();
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}
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/* Returns the number of children on the stack in the current node
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scope. */
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public int nodeArity() {
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return sp - mk;
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}
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public void clearNodeScope(Node n) {
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while (sp > mk) {
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popNode();
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}
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mk = ((Integer)marks.pop()).intValue();
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}
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public void openNodeScope(Node n) {
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marks.push(new Integer(mk));
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mk = sp;
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n.jjtOpen();
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}
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/* A definite node is constructed from a specified number of
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children. That number of nodes are popped from the stack and
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made the children of the definite node. Then the definite node
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is pushed on to the stack. */
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public void closeNodeScope(Node n, int num) {
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mk = ((Integer)marks.pop()).intValue();
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while (num-- > 0) {
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Node c = popNode();
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c.jjtSetParent(n);
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n.jjtAddChild(c, num);
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}
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n.jjtClose();
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pushNode(n);
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node_created = true;
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}
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/* A conditional node is constructed if its condition is true. All
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the nodes that have been pushed since the node was opened are
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made children of the the conditional node, which is then pushed
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on to the stack. If the condition is false the node is not
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constructed and they are left on the stack. */
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public void closeNodeScope(Node n, boolean condition) {
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if (condition) {
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int a = nodeArity();
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mk = ((Integer)marks.pop()).intValue();
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while (a-- > 0) {
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Node c = popNode();
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c.jjtSetParent(n);
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n.jjtAddChild(c, a);
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}
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n.jjtClose();
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pushNode(n);
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node_created = true;
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} else {
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mk = ((Integer)marks.pop()).intValue();
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node_created = false;
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}
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}
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}
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