/** The minimum set of functionality required for objects which are manipulated by JavaScript */
public abstract class JS {
-
- public static boolean checkAssertions = false;
-
public static final JS METHOD = new JS() { };
public final JS unclone() { return _unclone(); }
public final JS jsclone() throws JSExn { return new Clone(this); }
- // FEATURE: JSEnumeration
- public Enumeration keys() throws JSExn { throw new JSExn("you can't enumerate the keys of this object (class=" + getClass().getName() +")"); }
+ public JS.Enumeration keys() throws JSExn { throw new JSExn("you can't enumerate the keys of this object (class=" + getClass().getName() +")"); }
public JS get(JS key) throws JSExn { return null; }
public void put(JS key, JS val) throws JSExn { throw new JSExn("" + key + " is read only (class=" + getClass().getName() +")"); }
+
+ public InputStream getInputStream() throws IOException {
+ throw new IOException("this object doesn't have a stream associated with it " + getClass().getName() + ")");
+ }
public final boolean hasTrap(JS key) { return getTrap(key) != null; }
public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
throw new JSExn("method not found (" + JS.debugToString(method) + ")");
- }
+ }
- // FIXME: JSArgs objects, pointers into stack frame
public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
throw new JSExn("you cannot call this object (class=" + this.getClass().getName() +")");
}
public final boolean equals(Object o) { return this == o || ((o instanceof JS) && jsequals((JS)o)); }
- // FIXME: Remove this, eventually
- public final String toString() { throw new Error("you shouldn't use toString() on JS objects"); }
+ public final String toString() {
+ // Discourage people from using toString()
+ String s = "JS Object [class=" + getClass().getName() + "]";
+ String ext = extendedToString();
+ return ext == null ? s : s + " " + ext;
+ }
// These are only used internally by org.ibex.js
Trap getTrap(JS key) { return null; }
void putTrap(JS key, Trap value) throws JSExn { throw new JSExn("traps cannot be placed on this object (class=" + this.getClass().getName() +")"); }
String coerceToString() throws JSExn { throw new JSExn("can't coerce to a string (class=" + getClass().getName() +")"); }
boolean jsequals(JS o) { return this == o; }
+ String extendedToString() { return null; }
- public static class O extends JS {
+ public static class O extends JS implements Cloneable {
private Hash entries;
- public Enumeration keys() throws JSExn { return entries == null ? emptyEnumeration : entries.keys(); }
+ public Enumeration keys() throws JSExn { return entries == null ? (Enumeration)EMPTY_ENUMERATION : (Enumeration)new JavaEnumeration(null,entries.keys()); }
public JS get(JS key) throws JSExn { return entries == null ? null : (JS)entries.get(key, null); }
public void put(JS key, JS val) throws JSExn { (entries==null?entries=new Hash():entries).put(key,null,val); }
public final void replaceNode(int index, Object o) { bt().replaceNode(index,o); }
public final int indexNode(Object o) { return bt().indexNode(o); }
}
-
- // FEATURE: JS.StringKeys
- /* public static StringKeys extends JS {
- public JS get(JS key) { return JS.isString(key) ? get(JS.toString(key) : null; }
- ...
- */
-
+
JS _unclone() { return this; }
public interface Cloneable { }
- public static class Clone extends JS.O implements Cloneable {
+ public static class Clone extends JS.O {
protected final JS clonee;
JS _unclone() { return clonee.unclone(); }
public JS getClonee() { return clonee; }
public Clone(JS clonee) throws JSExn {
- if(!(clonee instanceof Cloneable)) throw new JSExn("" + getClass().getName() + " isn't cloneable");
+ if(!(clonee instanceof Cloneable)) throw new JSExn("" + clonee.getClass().getName() + " isn't cloneable");
this.clonee = clonee;
}
public boolean jsequals(JS o) { return unclone().jsequals(o.unclone()); }
public Enumeration keys() throws JSExn { return clonee.keys(); }
- public JS get(JS key) throws JSExn { return clonee.get(key); }
- public void put(JS key, JS val) throws JSExn { clonee.put(key, val); }
+ public JS get(JS key) throws JSExn { return clonee.getAndTriggerTraps(key); }
+ public void put(JS key, JS val) throws JSExn { clonee.putAndTriggerTraps(key, val); }
public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
return clonee.callMethod(method, a0, a1, a2, rest, nargs);
}
public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
return clonee.call(a0, a1, a2, rest, nargs);
}
+ public InputStream getInputStream() throws IOException { return clonee.getInputStream(); }
+ }
+
+ public static abstract class Enumeration extends JS {
+ final Enumeration parent;
+ boolean done;
+ public Enumeration(Enumeration parent) { this.parent = parent; }
+ protected abstract boolean _hasMoreElements();
+ protected abstract JS _nextElement() throws JSExn;
+
+ public final boolean hasMoreElements() {
+ if(!done && !_hasMoreElements()) done = true;
+ return !done ? true : parent != null ? parent.hasMoreElements() : false;
+ }
+ public final JS nextElement() throws JSExn { return !done ? _nextElement() : parent != null ? parent.nextElement() : null; }
+
+ public JS get(JS key) throws JSExn {
+ //#jswitch(key)
+ case "hasMoreElements": return B(hasMoreElements());
+ case "nextElement": return nextElement();
+ //#end
+ return super.get(key);
+ }
+ }
+ public static class EmptyEnumeration extends Enumeration {
+ public EmptyEnumeration(Enumeration parent) { super(parent); }
+ protected boolean _hasMoreElements() { return false; }
+ protected JS _nextElement() { return null; }
+ }
+ public static class JavaEnumeration extends Enumeration {
+ private final java.util.Enumeration e;
+ public JavaEnumeration(Enumeration parent, java.util.Enumeration e) { super(parent); this.e = e; }
+ protected boolean _hasMoreElements() { return e.hasMoreElements(); }
+ protected JS _nextElement() { return (JS) e.nextElement(); }
}
// Static Interpreter Control Methods ///////////////////////////////////////////////////////////////
public static UnpauseCallback pause() throws NotPauseableException {
Interpreter i = Interpreter.current();
if (i.pausecount == -1) throw new NotPauseableException();
+ boolean get;
+ switch(i.f.op[i.pc]) {
+ case Tokens.RETURN: case ByteCodes.PUT: get = false; break;
+ case ByteCodes.GET: case ByteCodes.CALL: get = true; break;
+ default: throw new Error("should never happen");
+ }
i.pausecount++;
- return new JS.UnpauseCallback(i);
+ return new JS.UnpauseCallback(i,get);
}
public static class UnpauseCallback implements Task {
- Interpreter i;
- UnpauseCallback(Interpreter i) { this.i = i; }
- public void perform() throws JSExn { unpause((JS)null); }
- public void unpause(JS o) throws JSExn {
- i.stack.push(o);
- i.resume();
+ private Interpreter i;
+ private boolean get;
+ UnpauseCallback(Interpreter i, boolean get) { this.i = i; this.get = get; }
+ public void perform() throws JSExn { unpause(); }
+ public JS unpause() throws JSExn { return unpause((JS)null); }
+ public JS unpause(JS o) throws JSExn {
+ if (o == JS.METHOD) throw new JSExn("can't return a method to a paused context");
+ if(get) i.stack.push(o);
+ return i.resume();
}
- public void unpause(JSExn e) {
- // FIXME: Throw the JSExn into the js world
- throw new Error("Exception " + e + " thrown from background task");
+ public JS unpause(JSExn e) throws JSExn {
+ i.catchException(e);
+ return i.resume();
}
}
public static boolean toBoolean(JS o) {
if(o == null) return false;
if(o instanceof JSNumber) return ((JSNumber)o).toBoolean();
- if(o instanceof JSString) return ((JSString)o).length() != 0;
+ if(o instanceof JSString) return ((JSString)o).s.length() != 0;
return true;
}
//#repeat long/int/double/float toLong/toInt/toDouble/toFloat Long/Integer/Double/Float parseLong/parseInt/parseDouble/parseFloat
public static String debugToString(JS o) {
try { return toString(o); }
- catch(JSExn e) { return "[class=" + o.getClass().getName() + "]"; }
+ catch(JSExn e) { return o.toString(); }
}
public static boolean isInt(JS o) {
if(o instanceof JSString) return true;
return false;
}
+
+ public static JS newArray() { return new JSArray(); }
+ public static JS newRegexp(JS pat, JS flags) throws JSExn { return new JSRegexp(pat,flags); }
// Instance Methods ////////////////////////////////////////////////////////////////////
public final static JS NaN = new JSNumber.D(Double.NaN);
public final static JS ZERO = new JSNumber.I(0);
public final static JS ONE = new JSNumber.I(1);
+ public final static JS MATH = new JSMath();
public static final JS T = new JSNumber.B(true);
public static final JS F = new JSNumber.B(false);
public static final JS B(boolean b) { return b ? T : F; }
public static final JS B(int i) { return i==0 ? F : T; }
- public static final JS S(String s) { return new JSString(s); }
+ private static final int CACHE_SIZE = 65536 / 4; // must be a power of two
+ private static final JSString[] stringCache = new JSString[CACHE_SIZE];
+ public static final JS S(String s) {
+ if(s == null) return null;
+ int slot = s.hashCode()&(CACHE_SIZE-1);
+ JSString ret = stringCache[slot];
+ if(ret == null || !ret.s.equals(s)) stringCache[slot] = ret = new JSString(s);
+ return ret;
+ }
+ public static final JS S(String s, boolean intern) { return intern ? JSString.intern(s) : S(s); }
public static final JS N(double d) { return new JSNumber.D(d); }
public static final JS N(long l) { return new JSNumber.L(l); }
return N(n.doubleValue());
}
- private static final JSNumber.I[] smallIntCache = new JSNumber.I[65535 / 4];
- private static final JSNumber.I[] largeIntCache = new JSNumber.I[65535 / 4];
+ private static final JSNumber.I[] smallIntCache = new JSNumber.I[CACHE_SIZE];
+ private static final JSNumber.I[] largeIntCache = new JSNumber.I[CACHE_SIZE];
public static final JS N(int i) {
JSNumber.I ret = null;
int idx = i + smallIntCache.length / 2;
- if (idx < smallIntCache.length && idx > 0) {
+ if (idx < CACHE_SIZE && idx > 0) {
ret = smallIntCache[idx];
if (ret != null) return ret;
}
- else ret = largeIntCache[Math.abs(idx % largeIntCache.length)];
+ else ret = largeIntCache[Math.abs(idx % CACHE_SIZE)];
if (ret == null || ret.i != i) {
ret = new JSNumber.I(i);
if (idx < smallIntCache.length && idx > 0) smallIntCache[idx] = ret;
- else largeIntCache[Math.abs(idx % largeIntCache.length)] = ret;
+ else largeIntCache[Math.abs(idx % CACHE_SIZE)] = ret;
}
return ret;
}
- private static Enumeration emptyEnumeration = new Enumeration() {
- public boolean hasMoreElements() { return false; }
- public Object nextElement() { throw new NoSuchElementException(); }
- };
+ private static Enumeration EMPTY_ENUMERATION = new EmptyEnumeration(null);
public static JS fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
return JSFunction._fromReader(sourceName, firstLine, sourceCode);
/** performs a put, triggering traps if present; traps are run in an unpauseable interpreter */
public void putAndTriggerTraps(JS key, JS value) throws JSExn {
Trap t = getTrap(key);
- if (t != null) t.invoke(value);
- else put(key, value);
+ if(t == null || (t = t.writeTrap()) == null) put(key,value);
+ else new Interpreter(t,value,false).resume();
}
/** performs a get, triggering traps if present; traps are run in an unpauseable interpreter */
public JS getAndTriggerTraps(JS key) throws JSExn {
Trap t = getTrap(key);
- if (t != null) return t.invoke();
- else return get(key);
+ if (t == null || (t = t.readTrap()) == null) return get(key);
+ else return new Interpreter(t,null,false).resume();
+ }
+
+ public JS justTriggerTraps(JS key, JS value) throws JSExn {
+ Trap t = getTrap(key);
+ if(t == null || (t = t.writeTrap()) == null) return value;
+ else return new Interpreter(t,value,true).resume();
}
/** adds a trap, avoiding duplicates */
final void delTrap(JS key, JSFunction f) throws JSExn {
Trap t = (Trap)getTrap(key);
if (t == null) return;
- if (t.f == f) { putTrap(t.name, t.next); return; }
+ if (t.f == f) { putTrap(t.target, t.next); return; }
for(; t.next != null; t = t.next) if (t.next.f == f) { t.next = t.next.next; return; }
}
projects / org.ibex.core.git / blobdiff