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() { };
12 public JS.Enumeration keys() throws JSExn { throw new JSExn("you can't enumerate the keys of this object (class=" + getClass().getName() +")"); }
13 public JS get(JS key) throws JSExn { return null; }
14 public void put(JS key, JS val) throws JSExn { throw new JSExn("" + key + " is read only (class=" + getClass().getName() +")"); }
16 public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
17 throw new JSExn("method not found (" + JS.debugToString(method) + ")");
19 public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
20 throw new JSExn("you cannot call this object (class=" + this.getClass().getName() +")");
22 public InputStream getInputStream() throws IOException {
23 throw new IOException("this object doesn't have a stream associated with it " + getClass().getName() + ")");
26 public final JS unclone() { return _unclone(); }
27 public final JS jsclone() throws JSExn { return new Clone(this); }
28 public final boolean hasTrap(JS key) { return getTrap(key) != null; }
29 public final boolean equals(Object o) { return this == o || ((o instanceof JS) && jsequals((JS)o)); }
30 // Discourage people from using toString()
31 public final String toString() { return "JS Object [class=" + getClass().getName() + "]"; }
33 // Package private methods
34 Trap getTrap(JS key) { return null; }
35 void putTrap(JS key, Trap value) throws JSExn { throw new JSExn("traps cannot be placed on this object (class=" + this.getClass().getName() +")"); }
36 String coerceToString() throws JSExn { throw new JSExn("can't coerce to a string (class=" + getClass().getName() +")"); }
37 boolean jsequals(JS o) { return this == o; }
38 JS _unclone() { return this; }
40 public static class O extends JS implements Cloneable {
43 public Enumeration keys() throws JSExn { return entries == null ? (Enumeration)EMPTY_ENUMERATION : (Enumeration)new JavaEnumeration(null,entries.keys()); }
44 public JS get(JS key) throws JSExn { return entries == null ? null : (JS)entries.get(key, null); }
45 public void put(JS key, JS val) throws JSExn { (entries==null?entries=new Hash():entries).put(key,null,val); }
47 /** retrieve a trap from the entries hash */
48 final Trap getTrap(JS key) {
49 return entries == null ? null : (Trap)entries.get(key, Trap.class);
52 /** retrieve a trap from the entries hash */
53 final void putTrap(JS key, Trap value) {
54 if (entries == null) entries = new Hash();
55 entries.put(key, Trap.class, value);
59 public interface Cloneable { }
61 public static class Clone extends O {
62 protected final JS clonee;
63 public Clone(JS clonee) throws JSExn {
64 if(!(clonee instanceof Cloneable)) throw new JSExn("" + clonee.getClass().getName() + " isn't cloneable");
67 JS _unclone() { return clonee.unclone(); }
68 boolean jsequals(JS o) { return clonee.jsequals(o); }
70 public Enumeration keys() throws JSExn { return clonee.keys(); }
71 public final JS get(JS key) throws JSExn { return clonee.get(key); }
72 public final void put(JS key, JS val) throws JSExn { clonee.put(key,val); }
73 public final JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
74 return clonee.callMethod(method,a0,a1,a2,rest,nargs);
76 public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
77 return clonee.call(a0, a1, a2, rest, nargs);
79 public InputStream getInputStream() throws IOException { return clonee.getInputStream(); }
80 // FIXME: This shouldn't be necessary (its for Ibex.Blessing)
81 public JS getClonee() { return clonee; }
84 public static abstract class Enumeration extends JS {
85 final Enumeration parent;
87 public Enumeration(Enumeration parent) { this.parent = parent; }
88 protected abstract boolean _hasMoreElements();
89 protected abstract JS _nextElement() throws JSExn;
91 public final boolean hasMoreElements() {
92 if(!done && !_hasMoreElements()) done = true;
93 return !done ? true : parent != null ? parent.hasMoreElements() : false;
95 public final JS nextElement() throws JSExn { return !done ? _nextElement() : parent != null ? parent.nextElement() : null; }
97 public JS get(JS key) throws JSExn {
98 //#switch(JS.toString(key))
99 case "hasMoreElements": return B(hasMoreElements());
100 case "nextElement": return nextElement();
102 return super.get(key);
106 public static class EmptyEnumeration extends Enumeration {
107 public EmptyEnumeration(Enumeration parent) { super(parent); }
108 protected boolean _hasMoreElements() { return false; }
109 protected JS _nextElement() { return null; }
111 public static class JavaEnumeration extends Enumeration {
112 private final java.util.Enumeration e;
113 public JavaEnumeration(Enumeration parent, java.util.Enumeration e) { super(parent); this.e = e; }
114 protected boolean _hasMoreElements() { return e.hasMoreElements(); }
115 protected JS _nextElement() { return (JS) e.nextElement(); }
118 // Static Interpreter Control Methods ///////////////////////////////////////////////////////////////
120 /** log a message with the current JavaScript sourceName/line */
121 public static void log(Object message) { info(message); }
122 public static void debug(Object message) { Log.debug(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
123 public static void info(Object message) { Log.info(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
124 public static void warn(Object message) { Log.warn(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
125 public static void error(Object message) { Log.error(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
127 public static class NotPauseableException extends Exception { NotPauseableException() { } }
129 /** returns a callback which will restart the context; expects a value to be pushed onto the stack when unpaused */
130 public static UnpauseCallback pause() throws NotPauseableException {
131 Interpreter i = Interpreter.current();
132 if (i.pausecount == -1) throw new NotPauseableException();
134 switch(i.f.op[i.pc]) {
135 case Tokens.RETURN: case ByteCodes.PUT: get = false; break;
136 case ByteCodes.GET: case ByteCodes.CALL: get = true; break;
137 default: throw new Error("should never happen");
140 return new JS.UnpauseCallback(i,get);
143 public static class UnpauseCallback implements Task {
144 private Interpreter i;
146 UnpauseCallback(Interpreter i, boolean get) { this.i = i; this.get = get; }
147 public void perform() throws JSExn { unpause(); }
148 public JS unpause() throws JSExn { return unpause((JS)null); }
149 public JS unpause(JS o) throws JSExn {
150 if (o == JS.METHOD) throw new JSExn("can't return a method to a paused context");
151 if(get) i.stack.push(o);
154 public JS unpause(JSExn e) throws JSExn {
162 // Static Helper Methods ///////////////////////////////////////////////////////////////////////////////////
164 /** coerce an object to a Boolean */
165 public static boolean toBoolean(JS o) {
166 if(o == null) return false;
167 if(o instanceof JSNumber) return ((JSNumber)o).toBoolean();
168 if(o instanceof JSString) return ((JSString)o).s.length() != 0;
171 //#repeat long/int/double/float toLong/toInt/toDouble/toFloat Long/Integer/Double/Float parseLong/parseInt/parseDouble/parseFloat
172 /** coerce an object to a Number */
173 public static long toLong(JS o) throws JSExn {
174 if(o == null) return 0;
175 if(o instanceof JSNumber) return ((JSNumber)o).toLong();
176 if(o instanceof JSString) return Long.parseLong(o.coerceToString());
177 throw new JSExn("can't coerce a " + o.getClass().getName() + " to a number");
181 public static String toString(JS o) throws JSExn {
182 if(o == null) return "null";
183 return o.coerceToString();
186 public static String debugToString(JS o) {
187 try { return toString(o); }
188 catch(JSExn e) { return o.toString(); }
191 public static boolean isInt(JS o) {
192 if(o == null) return true;
193 if(o instanceof JSNumber.I) return true;
194 if(o instanceof JSNumber.B) return false;
195 if(o instanceof JSNumber) {
196 JSNumber n = (JSNumber) o;
197 return n.toInt() == n.toDouble();
199 if(o instanceof JSString) {
200 String s = ((JSString)o).s;
201 for(int i=0;i<s.length();i++)
202 if(s.charAt(i) < '0' || s.charAt(i) > '9') return false;
208 public static boolean isString(JS o) {
209 if(o instanceof JSString) return true;
213 // Instance Methods ////////////////////////////////////////////////////////////////////
215 public final static JS NaN = new JSNumber.D(Double.NaN);
216 public final static JS ZERO = new JSNumber.I(0);
217 public final static JS ONE = new JSNumber.I(1);
218 public final static JS MATH = new JSMath();
220 public static final JS T = new JSNumber.B(true);
221 public static final JS F = new JSNumber.B(false);
223 public static final JS B(boolean b) { return b ? T : F; }
224 public static final JS B(int i) { return i==0 ? F : T; }
226 private static final int CACHE_SIZE = 65536 / 4; // must be a power of two
227 private static final JSString[] stringCache = new JSString[CACHE_SIZE];
228 public static final JS S(String s) {
229 if(s == null) return null;
230 int slot = s.hashCode()&(CACHE_SIZE-1);
231 JSString ret = stringCache[slot];
232 if(ret == null || !ret.s.equals(s)) stringCache[slot] = ret = new JSString(s);
235 public static final JS S(String s, boolean intern) { return intern ? JSString.intern(s) : S(s); }
237 public static final JS N(double d) { return new JSNumber.D(d); }
238 public static final JS N(long l) { return new JSNumber.L(l); }
240 public static final JS N(Number n) {
241 if(n instanceof Integer) return N(n.intValue());
242 if(n instanceof Long) return N(n.longValue());
243 return N(n.doubleValue());
246 private static final JSNumber.I[] smallIntCache = new JSNumber.I[CACHE_SIZE];
247 private static final JSNumber.I[] largeIntCache = new JSNumber.I[CACHE_SIZE];
248 public static final JS N(int i) {
249 JSNumber.I ret = null;
250 int idx = i + smallIntCache.length / 2;
251 if (idx < CACHE_SIZE && idx > 0) {
252 ret = smallIntCache[idx];
253 if (ret != null) return ret;
255 else ret = largeIntCache[Math.abs(idx % CACHE_SIZE)];
256 if (ret == null || ret.i != i) {
257 ret = new JSNumber.I(i);
258 if (idx < smallIntCache.length && idx > 0) smallIntCache[idx] = ret;
259 else largeIntCache[Math.abs(idx % CACHE_SIZE)] = ret;
264 private static Enumeration EMPTY_ENUMERATION = new EmptyEnumeration(null);
266 public static JS fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
267 return Parser.fromReader(sourceName, firstLine, sourceCode);
270 public static JS cloneWithNewGlobalScope(JS js, JS s) {
271 if(js instanceof JSFunction)
272 return ((JSFunction)js)._cloneWithNewParentScope(new JSScope.Top(s));
278 // Trap support //////////////////////////////////////////////////////////////////////////////
280 /** performs a put, triggering traps if present; traps are run in an unpauseable interpreter */
281 public final void putAndTriggerTraps(JS key, JS value) throws JSExn {
282 Trap t = getTrap(key);
283 if(t == null || (t = t.writeTrap()) == null) put(key,value);
284 else new Interpreter(t,value,false).resume();
287 /** performs a get, triggering traps if present; traps are run in an unpauseable interpreter */
288 public final JS getAndTriggerTraps(JS key) throws JSExn {
289 Trap t = getTrap(key);
290 if (t == null || (t = t.readTrap()) == null) return get(key);
291 else return new Interpreter(t,null,false).resume();
294 public final JS justTriggerTraps(JS key, JS value) throws JSExn {
295 Trap t = getTrap(key);
296 if(t == null || (t = t.writeTrap()) == null) return value;
297 else return new Interpreter(t,value,true).resume();
300 /** adds a trap, avoiding duplicates */
301 // FIXME: This shouldn't be public, it is needed for a hack in Template.java
302 public void addTrap(JS key, JSFunction f) throws JSExn {
303 if (f.numFormalArgs > 1) throw new JSExn("traps must take either one argument (write) or no arguments (read)");
304 boolean isRead = f.numFormalArgs == 0;
305 for(Trap t = getTrap(key); t != null; t = t.next) if (t.f == f) return;
306 putTrap(key, new Trap(this, key, f, (Trap)getTrap(key)));
309 /** deletes a trap, if present */
310 // FIXME: This shouldn't be public, it is needed for a hack in Template.java
311 public void delTrap(JS key, JSFunction f) throws JSExn {
312 Trap t = (Trap)getTrap(key);
313 if (t == null) return;
314 if (t.f == f) { putTrap(t.target, t.next); return; }
315 for(; t.next != null; t = t.next) if (t.next.f == f) { t.next = t.next.next; return; }