1 // Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
4 import org.ibex.util.*;
8 /** The minimum set of functionality required for objects which are manipulated by JavaScript */
9 public abstract class JS {
10 public static final JS METHOD = new JS() { };
11 public final JS unclone() { return _unclone(); }
12 public final JS jsclone() throws JSExn { return new Clone(this); }
14 public JS.Enumeration keys() throws JSExn { throw new JSExn("you can't enumerate the keys of this object (class=" + getClass().getName() +")"); }
15 public JS get(JS key) throws JSExn { return null; }
16 public void put(JS key, JS val) throws JSExn { throw new JSExn("" + key + " is read only (class=" + getClass().getName() +")"); }
18 public InputStream getInputStream() throws IOException {
19 throw new IOException("this object doesn't have a stream associated with it " + getClass().getName() + ")");
22 public final boolean hasTrap(JS key) { return getTrap(key) != null; }
24 public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
25 throw new JSExn("method not found (" + JS.debugToString(method) + ")");
28 public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
29 throw new JSExn("you cannot call this object (class=" + this.getClass().getName() +")");
32 public final boolean equals(Object o) { return this == o || ((o instanceof JS) && jsequals((JS)o)); }
34 public final String toString() {
35 // Discourage people from using toString()
36 String s = "JS Object [class=" + getClass().getName() + "]";
37 String ext = extendedToString();
38 return ext == null ? s : s + " " + ext;
41 // These are only used internally by org.ibex.js
42 Trap getTrap(JS key) { return null; }
43 void putTrap(JS key, Trap value) throws JSExn { throw new JSExn("traps cannot be placed on this object (class=" + this.getClass().getName() +")"); }
44 String coerceToString() throws JSExn { throw new JSExn("can't coerce to a string (class=" + getClass().getName() +")"); }
45 boolean jsequals(JS o) { return this == o; }
46 String extendedToString() { return null; }
48 public static class O extends JS implements Cloneable {
51 public Enumeration keys() throws JSExn { return entries == null ? (Enumeration)EMPTY_ENUMERATION : (Enumeration)new JavaEnumeration(null,entries.keys()); }
52 public JS get(JS key) throws JSExn { return entries == null ? null : (JS)entries.get(key, null); }
53 public void put(JS key, JS val) throws JSExn { (entries==null?entries=new Hash():entries).put(key,null,val); }
55 /** retrieve a trap from the entries hash */
56 final Trap getTrap(JS key) {
57 return entries == null ? null : (Trap)entries.get(key, Trap.class);
60 /** retrieve a trap from the entries hash */
61 final void putTrap(JS key, Trap value) {
62 if (entries == null) entries = new Hash();
63 entries.put(key, Trap.class, value);
67 public static class BT extends O {
68 private BalancedTree bt;
69 private final BalancedTree bt() { if(bt != null) return bt; return bt = new BalancedTree(); }
70 public final void insertNode(int index, Object o) { bt().insertNode(index,o); }
71 public final void clear() { bt().clear(); }
72 public final Object getNode(int i) { return bt().getNode(i); }
73 public final int treeSize() { return bt().treeSize(); }
74 public final Object deleteNode(int i) { return bt().deleteNode(i); }
75 public final void replaceNode(int index, Object o) { bt().replaceNode(index,o); }
76 public final int indexNode(Object o) { return bt().indexNode(o); }
79 JS _unclone() { return this; }
81 public interface Cloneable { }
83 public static class Clone extends JS.O {
84 protected final JS clonee;
85 JS _unclone() { return clonee.unclone(); }
86 public JS getClonee() { return clonee; }
87 public Clone(JS clonee) throws JSExn {
88 if(!(clonee instanceof Cloneable)) throw new JSExn("" + clonee.getClass().getName() + " isn't cloneable");
91 public boolean jsequals(JS o) { return unclone().jsequals(o.unclone()); }
92 public Enumeration keys() throws JSExn { return clonee.keys(); }
93 public JS get(JS key) throws JSExn { return clonee.getAndTriggerTraps(key); }
94 public void put(JS key, JS val) throws JSExn { clonee.putAndTriggerTraps(key, val); }
95 public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
96 return clonee.callMethod(method, a0, a1, a2, rest, nargs);
98 public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
99 return clonee.call(a0, a1, a2, rest, nargs);
101 public InputStream getInputStream() throws IOException { return clonee.getInputStream(); }
104 public static abstract class Enumeration extends JS {
105 final Enumeration parent;
107 public Enumeration(Enumeration parent) { this.parent = parent; }
108 protected abstract boolean _hasMoreElements();
109 protected abstract JS _nextElement() throws JSExn;
111 public final boolean hasMoreElements() {
112 if(!done && !_hasMoreElements()) done = true;
113 return !done ? true : parent != null ? parent.hasMoreElements() : false;
115 public final JS nextElement() throws JSExn { return !done ? _nextElement() : parent != null ? parent.nextElement() : null; }
117 public JS get(JS key) throws JSExn {
119 case "hasMoreElements": return B(hasMoreElements());
120 case "nextElement": return nextElement();
122 return super.get(key);
125 public static class EmptyEnumeration extends Enumeration {
126 public EmptyEnumeration(Enumeration parent) { super(parent); }
127 protected boolean _hasMoreElements() { return false; }
128 protected JS _nextElement() { return null; }
130 public static class JavaEnumeration extends Enumeration {
131 private final java.util.Enumeration e;
132 public JavaEnumeration(Enumeration parent, java.util.Enumeration e) { super(parent); this.e = e; }
133 protected boolean _hasMoreElements() { return e.hasMoreElements(); }
134 protected JS _nextElement() { return (JS) e.nextElement(); }
137 // Static Interpreter Control Methods ///////////////////////////////////////////////////////////////
139 /** log a message with the current JavaScript sourceName/line */
140 public static void log(Object message) { info(message); }
141 public static void debug(Object message) { Log.debug(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
142 public static void info(Object message) { Log.info(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
143 public static void warn(Object message) { Log.warn(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
144 public static void error(Object message) { Log.error(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
146 public static class NotPauseableException extends Exception { NotPauseableException() { } }
148 /** returns a callback which will restart the context; expects a value to be pushed onto the stack when unpaused */
149 public static UnpauseCallback pause() throws NotPauseableException {
150 Interpreter i = Interpreter.current();
151 if (i.pausecount == -1) throw new NotPauseableException();
153 switch(i.f.op[i.pc]) {
154 case Tokens.RETURN: case ByteCodes.PUT: get = false; break;
155 case ByteCodes.GET: case ByteCodes.CALL: get = true; break;
156 default: throw new Error("should never happen");
159 return new JS.UnpauseCallback(i,get);
162 public static class UnpauseCallback implements Task {
163 private Interpreter i;
165 UnpauseCallback(Interpreter i, boolean get) { this.i = i; this.get = get; }
166 public void perform() throws JSExn { unpause(); }
167 public JS unpause() throws JSExn { return unpause((JS)null); }
168 public JS unpause(JS o) throws JSExn {
169 if (o == JS.METHOD) throw new JSExn("can't return a method to a paused context");
170 if(get) i.stack.push(o);
173 public JS unpause(JSExn e) throws JSExn {
181 // Static Helper Methods ///////////////////////////////////////////////////////////////////////////////////
183 /** coerce an object to a Boolean */
184 public static boolean toBoolean(JS o) {
185 if(o == null) return false;
186 if(o instanceof JSNumber) return ((JSNumber)o).toBoolean();
187 if(o instanceof JSString) return ((JSString)o).s.length() != 0;
190 //#repeat long/int/double/float toLong/toInt/toDouble/toFloat Long/Integer/Double/Float parseLong/parseInt/parseDouble/parseFloat
191 /** coerce an object to a Number */
192 public static long toLong(JS o) throws JSExn {
193 if(o == null) return 0;
194 if(o instanceof JSNumber) return ((JSNumber)o).toLong();
195 if(o instanceof JSString) return Long.parseLong(o.coerceToString());
196 throw new JSExn("can't coerce a " + o.getClass().getName() + " to a number");
200 public static String toString(JS o) throws JSExn {
201 if(o == null) return "null";
202 return o.coerceToString();
205 public static String debugToString(JS o) {
206 try { return toString(o); }
207 catch(JSExn e) { return o.toString(); }
210 public static boolean isInt(JS o) {
211 if(o == null) return true;
212 if(o instanceof JSNumber.I) return true;
213 if(o instanceof JSNumber.B) return false;
214 if(o instanceof JSNumber) {
215 JSNumber n = (JSNumber) o;
216 return n.toInt() == n.toDouble();
218 if(o instanceof JSString) {
219 String s = ((JSString)o).s;
220 for(int i=0;i<s.length();i++)
221 if(s.charAt(i) < '0' || s.charAt(i) > '9') return false;
227 public static boolean isString(JS o) {
228 if(o instanceof JSString) return true;
232 public static JS newArray() { return new JSArray(); }
233 public static JS newRegexp(JS pat, JS flags) throws JSExn { return new JSRegexp(pat,flags); }
235 // Instance Methods ////////////////////////////////////////////////////////////////////
237 public final static JS NaN = new JSNumber.D(Double.NaN);
238 public final static JS ZERO = new JSNumber.I(0);
239 public final static JS ONE = new JSNumber.I(1);
240 public final static JS MATH = new JSMath();
242 public static final JS T = new JSNumber.B(true);
243 public static final JS F = new JSNumber.B(false);
245 public static final JS B(boolean b) { return b ? T : F; }
246 public static final JS B(int i) { return i==0 ? F : T; }
248 private static final int CACHE_SIZE = 65536 / 4; // must be a power of two
249 private static final JSString[] stringCache = new JSString[CACHE_SIZE];
250 public static final JS S(String s) {
251 if(s == null) return null;
252 int slot = s.hashCode()&(CACHE_SIZE-1);
253 JSString ret = stringCache[slot];
254 if(ret == null || !ret.s.equals(s)) stringCache[slot] = ret = new JSString(s);
257 public static final JS S(String s, boolean intern) { return intern ? JSString.intern(s) : S(s); }
259 public static final JS N(double d) { return new JSNumber.D(d); }
260 public static final JS N(long l) { return new JSNumber.L(l); }
262 public static final JS N(Number n) {
263 if(n instanceof Integer) return N(n.intValue());
264 if(n instanceof Long) return N(n.longValue());
265 return N(n.doubleValue());
268 private static final JSNumber.I[] smallIntCache = new JSNumber.I[CACHE_SIZE];
269 private static final JSNumber.I[] largeIntCache = new JSNumber.I[CACHE_SIZE];
270 public static final JS N(int i) {
271 JSNumber.I ret = null;
272 int idx = i + smallIntCache.length / 2;
273 if (idx < CACHE_SIZE && idx > 0) {
274 ret = smallIntCache[idx];
275 if (ret != null) return ret;
277 else ret = largeIntCache[Math.abs(idx % CACHE_SIZE)];
278 if (ret == null || ret.i != i) {
279 ret = new JSNumber.I(i);
280 if (idx < smallIntCache.length && idx > 0) smallIntCache[idx] = ret;
281 else largeIntCache[Math.abs(idx % CACHE_SIZE)] = ret;
286 private static Enumeration EMPTY_ENUMERATION = new EmptyEnumeration(null);
288 public static JS fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
289 return JSFunction._fromReader(sourceName, firstLine, sourceCode);
292 // HACK: caller can't know if the argument is a JSFunction or not...
293 public static JS cloneWithNewParentScope(JS j, JSScope s) {
294 return ((JSFunction)j)._cloneWithNewParentScope(s);
298 // Trap support //////////////////////////////////////////////////////////////////////////////
300 /** performs a put, triggering traps if present; traps are run in an unpauseable interpreter */
301 public void putAndTriggerTraps(JS key, JS value) throws JSExn {
302 Trap t = getTrap(key);
303 if(t == null || (t = t.writeTrap()) == null) put(key,value);
304 else new Interpreter(t,value,false).resume();
307 /** performs a get, triggering traps if present; traps are run in an unpauseable interpreter */
308 public JS getAndTriggerTraps(JS key) throws JSExn {
309 Trap t = getTrap(key);
310 if (t == null || (t = t.readTrap()) == null) return get(key);
311 else return new Interpreter(t,null,false).resume();
314 public JS justTriggerTraps(JS key, JS value) throws JSExn {
315 Trap t = getTrap(key);
316 if(t == null || (t = t.writeTrap()) == null) return value;
317 else return new Interpreter(t,value,true).resume();
320 /** adds a trap, avoiding duplicates */
321 final void addTrap(JS key, JSFunction f) throws JSExn {
322 if (f.numFormalArgs > 1) throw new JSExn("traps must take either one argument (write) or no arguments (read)");
323 boolean isRead = f.numFormalArgs == 0;
324 for(Trap t = getTrap(key); t != null; t = t.next) if (t.f == f) return;
325 putTrap(key, new Trap(this, key, f, (Trap)getTrap(key)));
328 /** deletes a trap, if present */
329 final void delTrap(JS key, JSFunction f) throws JSExn {
330 Trap t = (Trap)getTrap(key);
331 if (t == null) return;
332 if (t.f == f) { putTrap(t.target, t.next); return; }
333 for(; t.next != null; t = t.next) if (t.next.f == f) { t.next = t.next.next; return; }