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 {
11 public static boolean checkAssertions = false;
13 public static final JS METHOD = new JS() { };
14 public final JS unclone() { return _unclone(); }
15 public final JS jsclone() throws JSExn { return new Clone(this); }
17 public JS.Enumeration keys() throws JSExn { throw new JSExn("you can't enumerate the keys of this object (class=" + getClass().getName() +")"); }
18 public JS get(JS key) throws JSExn { return null; }
19 public void put(JS key, JS val) throws JSExn { throw new JSExn("" + key + " is read only (class=" + getClass().getName() +")"); }
21 public InputStream getInputStream() throws IOException {
22 throw new IOException("this object doesn't have a stream associated with it " + getClass().getName() + ")");
25 public final boolean hasTrap(JS key) { return getTrap(key) != null; }
27 public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
28 throw new JSExn("method not found (" + JS.debugToString(method) + ")");
31 public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
32 throw new JSExn("you cannot call this object (class=" + this.getClass().getName() +")");
35 public final boolean equals(Object o) { return this == o || ((o instanceof JS) && jsequals((JS)o)); }
37 // FIXME: Remove this, eventually
38 public final String toString() { throw new Error("you shouldn't use toString() on JS objects"); }
40 // These are only used internally by org.ibex.js
41 Trap getTrap(JS key) { return null; }
42 void putTrap(JS key, Trap value) throws JSExn { throw new JSExn("traps cannot be placed on this object (class=" + this.getClass().getName() +")"); }
43 String coerceToString() throws JSExn { throw new JSExn("can't coerce to a string (class=" + getClass().getName() +")"); }
44 String debugToString() { return "[class=" + getClass().getName() + "]"; }
45 boolean jsequals(JS o) { return this == o; }
47 public static class O extends JS implements Cloneable {
50 public Enumeration keys() throws JSExn { return entries == null ? (Enumeration)EMPTY_ENUMERATION : (Enumeration)new JavaEnumeration(null,entries.keys()); }
51 public JS get(JS key) throws JSExn { return entries == null ? null : (JS)entries.get(key, null); }
52 public void put(JS key, JS val) throws JSExn { (entries==null?entries=new Hash():entries).put(key,null,val); }
54 /** retrieve a trap from the entries hash */
55 final Trap getTrap(JS key) {
56 return entries == null ? null : (Trap)entries.get(key, Trap.class);
59 /** retrieve a trap from the entries hash */
60 final void putTrap(JS key, Trap value) {
61 if (entries == null) entries = new Hash();
62 entries.put(key, Trap.class, value);
66 public static class BT extends O {
67 private BalancedTree bt;
68 private final BalancedTree bt() { if(bt != null) return bt; return bt = new BalancedTree(); }
69 public final void insertNode(int index, Object o) { bt().insertNode(index,o); }
70 public final void clear() { bt().clear(); }
71 public final Object getNode(int i) { return bt().getNode(i); }
72 public final int treeSize() { return bt().treeSize(); }
73 public final Object deleteNode(int i) { return bt().deleteNode(i); }
74 public final void replaceNode(int index, Object o) { bt().replaceNode(index,o); }
75 public final int indexNode(Object o) { return bt().indexNode(o); }
78 JS _unclone() { return this; }
80 public interface Cloneable { }
82 public static class Clone extends JS.O {
83 protected final JS clonee;
84 JS _unclone() { return clonee.unclone(); }
85 public JS getClonee() { return clonee; }
86 public Clone(JS clonee) throws JSExn {
87 if(!(clonee instanceof Cloneable)) throw new JSExn("" + clonee.getClass().getName() + " isn't cloneable");
90 public boolean jsequals(JS o) { return unclone().jsequals(o.unclone()); }
91 public Enumeration keys() throws JSExn { return clonee.keys(); }
92 public JS get(JS key) throws JSExn { return clonee.getAndTriggerTraps(key); }
93 public void put(JS key, JS val) throws JSExn { clonee.putAndTriggerTraps(key, val); }
94 public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
95 return clonee.callMethod(method, a0, a1, a2, rest, nargs);
97 public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
98 return clonee.call(a0, a1, a2, rest, nargs);
100 public InputStream getInputStream() throws IOException { return clonee.getInputStream(); }
103 public static abstract class Enumeration extends JS {
104 final Enumeration parent;
106 public Enumeration(Enumeration parent) { this.parent = parent; }
107 protected abstract boolean _hasMoreElements();
108 protected abstract JS _nextElement() throws JSExn;
110 public final boolean hasMoreElements() {
111 if(!done && !_hasMoreElements()) done = true;
112 return !done ? true : parent != null ? parent.hasMoreElements() : false;
114 public final JS nextElement() throws JSExn { return !done ? _nextElement() : parent != null ? parent.nextElement() : null; }
116 public JS get(JS key) throws JSExn {
118 case "hasMoreElements": return B(hasMoreElements());
119 case "nextElement": return nextElement();
121 return super.get(key);
124 public static class EmptyEnumeration extends Enumeration {
125 public EmptyEnumeration(Enumeration parent) { super(parent); }
126 protected boolean _hasMoreElements() { return false; }
127 protected JS _nextElement() { return null; }
129 public static class JavaEnumeration extends Enumeration {
130 private final java.util.Enumeration e;
131 public JavaEnumeration(Enumeration parent, java.util.Enumeration e) { super(parent); this.e = e; }
132 protected boolean _hasMoreElements() { return e.hasMoreElements(); }
133 protected JS _nextElement() { return (JS) e.nextElement(); }
136 // Static Interpreter Control Methods ///////////////////////////////////////////////////////////////
138 /** log a message with the current JavaScript sourceName/line */
139 public static void log(Object message) { info(message); }
140 public static void debug(Object message) { Log.debug(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
141 public static void info(Object message) { Log.info(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
142 public static void warn(Object message) { Log.warn(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
143 public static void error(Object message) { Log.error(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
145 public static class NotPauseableException extends Exception { NotPauseableException() { } }
147 /** returns a callback which will restart the context; expects a value to be pushed onto the stack when unpaused */
148 public static UnpauseCallback pause() throws NotPauseableException {
149 Interpreter i = Interpreter.current();
150 if (i.pausecount == -1) throw new NotPauseableException();
152 switch(i.f.op[i.pc]) {
153 case Tokens.RETURN: case ByteCodes.PUT: get = false; break;
154 case ByteCodes.GET: case ByteCodes.CALL: get = true; break;
155 default: throw new Error("should never happen");
158 return new JS.UnpauseCallback(i,get);
161 public static class UnpauseCallback implements Task {
162 private Interpreter i;
164 UnpauseCallback(Interpreter i, boolean get) { this.i = i; this.get = get; }
165 public void perform() throws JSExn { unpause(); }
166 public JS unpause() throws JSExn { return unpause((JS)null); }
167 public JS unpause(JS o) throws JSExn {
168 if (o == JS.METHOD) throw new JSExn("can't return a method to a paused context");
169 if(get) i.stack.push(o);
172 public JS unpause(JSExn e) throws JSExn {
180 // Static Helper Methods ///////////////////////////////////////////////////////////////////////////////////
182 /** coerce an object to a Boolean */
183 public static boolean toBoolean(JS o) {
184 if(o == null) return false;
185 if(o instanceof JSNumber) return ((JSNumber)o).toBoolean();
186 if(o instanceof JSString) return ((JSString)o).length() != 0;
189 //#repeat long/int/double/float toLong/toInt/toDouble/toFloat Long/Integer/Double/Float parseLong/parseInt/parseDouble/parseFloat
190 /** coerce an object to a Number */
191 public static long toLong(JS o) throws JSExn {
192 if(o == null) return 0;
193 if(o instanceof JSNumber) return ((JSNumber)o).toLong();
194 if(o instanceof JSString) return Long.parseLong(o.coerceToString());
195 throw new JSExn("can't coerce a " + o.getClass().getName() + " to a number");
199 public static String toString(JS o) throws JSExn {
200 if(o == null) return "null";
201 return o.coerceToString();
204 public static String debugToString(JS o) {
205 try { return toString(o); }
206 catch(JSExn e) { return o.debugToString(); }
209 public static boolean isInt(JS o) {
210 if(o == null) return true;
211 if(o instanceof JSNumber.I) return true;
212 if(o instanceof JSNumber.B) return false;
213 if(o instanceof JSNumber) {
214 JSNumber n = (JSNumber) o;
215 return n.toInt() == n.toDouble();
217 if(o instanceof JSString) {
218 String s = ((JSString)o).s;
219 for(int i=0;i<s.length();i++)
220 if(s.charAt(i) < '0' || s.charAt(i) > '9') return false;
226 public static boolean isString(JS o) {
227 if(o instanceof JSString) return true;
231 // Instance Methods ////////////////////////////////////////////////////////////////////
233 public final static JS NaN = new JSNumber.D(Double.NaN);
234 public final static JS ZERO = new JSNumber.I(0);
235 public final static JS ONE = new JSNumber.I(1);
237 public static final JS T = new JSNumber.B(true);
238 public static final JS F = new JSNumber.B(false);
240 public static final JS B(boolean b) { return b ? T : F; }
241 public static final JS B(int i) { return i==0 ? F : T; }
243 private static final int CACHE_SIZE = 65536 / 4; // must be a power of two
244 private static final JSString[] stringCache = new JSString[CACHE_SIZE];
245 public static final JS S(String s) {
246 if(s == null) return null;
247 int slot = s.hashCode()&(CACHE_SIZE-1);
248 JSString ret = stringCache[slot];
249 if(ret == null || !ret.s.equals(s)) stringCache[slot] = ret = new JSString(s);
253 public static final JS N(double d) { return new JSNumber.D(d); }
254 public static final JS N(long l) { return new JSNumber.L(l); }
256 public static final JS N(Number n) {
257 if(n instanceof Integer) return N(n.intValue());
258 if(n instanceof Long) return N(n.longValue());
259 return N(n.doubleValue());
262 private static final JSNumber.I[] smallIntCache = new JSNumber.I[CACHE_SIZE];
263 private static final JSNumber.I[] largeIntCache = new JSNumber.I[CACHE_SIZE];
264 public static final JS N(int i) {
265 JSNumber.I ret = null;
266 int idx = i + smallIntCache.length / 2;
267 if (idx < CACHE_SIZE && idx > 0) {
268 ret = smallIntCache[idx];
269 if (ret != null) return ret;
271 else ret = largeIntCache[Math.abs(idx % CACHE_SIZE)];
272 if (ret == null || ret.i != i) {
273 ret = new JSNumber.I(i);
274 if (idx < smallIntCache.length && idx > 0) smallIntCache[idx] = ret;
275 else largeIntCache[Math.abs(idx % CACHE_SIZE)] = ret;
280 private static Enumeration EMPTY_ENUMERATION = new EmptyEnumeration(null);
282 public static JS fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
283 return JSFunction._fromReader(sourceName, firstLine, sourceCode);
286 // HACK: caller can't know if the argument is a JSFunction or not...
287 public static JS cloneWithNewParentScope(JS j, JSScope s) {
288 return ((JSFunction)j)._cloneWithNewParentScope(s);
292 // Trap support //////////////////////////////////////////////////////////////////////////////
294 /** performs a put, triggering traps if present; traps are run in an unpauseable interpreter */
295 public void putAndTriggerTraps(JS key, JS value) throws JSExn {
296 Trap t = getTrap(key);
297 if(t == null || (t = t.writeTrap()) == null) put(key,value);
298 else new Interpreter(t,value,false).resume();
301 /** performs a get, triggering traps if present; traps are run in an unpauseable interpreter */
302 public JS getAndTriggerTraps(JS key) throws JSExn {
303 Trap t = getTrap(key);
304 if (t == null || (t = t.readTrap()) == null) return get(key);
305 else return new Interpreter(t,null,false).resume();
308 public JS justTriggerTraps(JS key, JS value) throws JSExn {
309 Trap t = getTrap(key);
310 if(t == null || (t = t.writeTrap()) == null) return value;
311 else return new Interpreter(t,value,true).resume();
314 /** adds a trap, avoiding duplicates */
315 final void addTrap(JS key, JSFunction f) throws JSExn {
316 if (f.numFormalArgs > 1) throw new JSExn("traps must take either one argument (write) or no arguments (read)");
317 boolean isRead = f.numFormalArgs == 0;
318 for(Trap t = getTrap(key); t != null; t = t.next) if (t.f == f) return;
319 putTrap(key, new Trap(this, key, f, (Trap)getTrap(key)));
322 /** deletes a trap, if present */
323 final void delTrap(JS key, JSFunction f) throws JSExn {
324 Trap t = (Trap)getTrap(key);
325 if (t == null) return;
326 if (t.f == f) { putTrap(t.target, t.next); return; }
327 for(; t.next != null; t = t.next) if (t.next.f == f) { t.next = t.next.next; return; }