1 // Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
5 * This class encapsulates a single trap placed on a given node. The
6 * traps for a given property name on a given box are maintained as a
7 * linked list stack, with the most recently placed trap at the head
12 JS trapee = null; ///< the box on which this trap was placed
13 Object name = null; ///< the property that the trap was placed on
15 JSFunction f = null; ///< the function for this trap
16 Trap next = null; ///< the next trap down the trap stack
18 Trap(JS b, String n, JSFunction f, Trap nx) {
19 trapee = b; name = n; this.f = f; this.next = nx;
22 private static final JSFunction putInvoker = new JSFunction("putInvoker", 0, null);
23 private static final JSFunction getInvoker = new JSFunction("getInvoker", 0, null);
26 putInvoker.add(1, ByteCodes.PUT, null);
27 putInvoker.add(2, Tokens.RETURN, null);
28 getInvoker.add(1, ByteCodes.GET, null);
29 getInvoker.add(2, Tokens.RETURN, null);
32 void invoke(Object value) throws JSExn {
33 Interpreter i = new Interpreter(putInvoker, false, null);
40 Object invoke() throws JSExn {
41 Interpreter i = new Interpreter(getInvoker, false, null);
47 // FIXME: review; is necessary?
48 static class TrapScope extends JSScope {
51 boolean cascadeHappened = false;
52 public TrapScope(JSScope parent, Trap t, Object val) { super(parent); this.t = t; this.val = val; }
53 public Object get(Object key) throws JSExn {
54 if (key.equals("trapee")) return t.trapee;
55 if (key.equals("callee")) return t.f;
56 if (key.equals("trapname")) return t.name;
57 return super.get(key);