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 JS _unclone() { return this; }
69 public interface Cloneable { }
71 public static class Clone extends JS.O {
72 protected final JS clonee;
73 JS _unclone() { return clonee.unclone(); }
74 public JS getClonee() { return clonee; }
75 public Clone(JS clonee) throws JSExn {
76 if(!(clonee instanceof Cloneable)) throw new JSExn("" + clonee.getClass().getName() + " isn't cloneable");
79 public boolean jsequals(JS o) { return unclone().jsequals(o.unclone()); }
80 public Enumeration keys() throws JSExn { return clonee.keys(); }
81 public JS get(JS key) throws JSExn { return clonee.getAndTriggerTraps(key); }
82 public void put(JS key, JS val) throws JSExn { clonee.putAndTriggerTraps(key, val); }
83 public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
84 return clonee.callMethod(method, a0, a1, a2, rest, nargs);
86 public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
87 return clonee.call(a0, a1, a2, rest, nargs);
89 public InputStream getInputStream() throws IOException { return clonee.getInputStream(); }
92 public static abstract class Enumeration extends JS {
93 final Enumeration parent;
95 public Enumeration(Enumeration parent) { this.parent = parent; }
96 protected abstract boolean _hasMoreElements();
97 protected abstract JS _nextElement() throws JSExn;
99 public final boolean hasMoreElements() {
100 if(!done && !_hasMoreElements()) done = true;
101 return !done ? true : parent != null ? parent.hasMoreElements() : false;
103 public final JS nextElement() throws JSExn { return !done ? _nextElement() : parent != null ? parent.nextElement() : null; }
105 public JS get(JS key) throws JSExn {
107 case "hasMoreElements": return B(hasMoreElements());
108 case "nextElement": return nextElement();
110 return super.get(key);
113 public static class EmptyEnumeration extends Enumeration {
114 public EmptyEnumeration(Enumeration parent) { super(parent); }
115 protected boolean _hasMoreElements() { return false; }
116 protected JS _nextElement() { return null; }
118 public static class JavaEnumeration extends Enumeration {
119 private final java.util.Enumeration e;
120 public JavaEnumeration(Enumeration parent, java.util.Enumeration e) { super(parent); this.e = e; }
121 protected boolean _hasMoreElements() { return e.hasMoreElements(); }
122 protected JS _nextElement() { return (JS) e.nextElement(); }
125 // Static Interpreter Control Methods ///////////////////////////////////////////////////////////////
127 /** log a message with the current JavaScript sourceName/line */
128 public static void log(Object message) { info(message); }
129 public static void debug(Object message) { Log.debug(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
130 public static void info(Object message) { Log.info(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
131 public static void warn(Object message) { Log.warn(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
132 public static void error(Object message) { Log.error(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
134 public static class NotPauseableException extends Exception { NotPauseableException() { } }
136 /** returns a callback which will restart the context; expects a value to be pushed onto the stack when unpaused */
137 public static UnpauseCallback pause() throws NotPauseableException {
138 Interpreter i = Interpreter.current();
139 if (i.pausecount == -1) throw new NotPauseableException();
141 switch(i.f.op[i.pc]) {
142 case Tokens.RETURN: case ByteCodes.PUT: get = false; break;
143 case ByteCodes.GET: case ByteCodes.CALL: get = true; break;
144 default: throw new Error("should never happen");
147 return new JS.UnpauseCallback(i,get);
150 public static class UnpauseCallback implements Task {
151 private Interpreter i;
153 UnpauseCallback(Interpreter i, boolean get) { this.i = i; this.get = get; }
154 public void perform() throws JSExn { unpause(); }
155 public JS unpause() throws JSExn { return unpause((JS)null); }
156 public JS unpause(JS o) throws JSExn {
157 if (o == JS.METHOD) throw new JSExn("can't return a method to a paused context");
158 if(get) i.stack.push(o);
161 public JS unpause(JSExn e) throws JSExn {
169 // Static Helper Methods ///////////////////////////////////////////////////////////////////////////////////
171 /** coerce an object to a Boolean */
172 public static boolean toBoolean(JS o) {
173 if(o == null) return false;
174 if(o instanceof JSNumber) return ((JSNumber)o).toBoolean();
175 if(o instanceof JSString) return ((JSString)o).s.length() != 0;
178 //#repeat long/int/double/float toLong/toInt/toDouble/toFloat Long/Integer/Double/Float parseLong/parseInt/parseDouble/parseFloat
179 /** coerce an object to a Number */
180 public static long toLong(JS o) throws JSExn {
181 if(o == null) return 0;
182 if(o instanceof JSNumber) return ((JSNumber)o).toLong();
183 if(o instanceof JSString) return Long.parseLong(o.coerceToString());
184 throw new JSExn("can't coerce a " + o.getClass().getName() + " to a number");
188 public static String toString(JS o) throws JSExn {
189 if(o == null) return "null";
190 return o.coerceToString();
193 public static String debugToString(JS o) {
194 try { return toString(o); }
195 catch(JSExn e) { return o.toString(); }
198 public static boolean isInt(JS o) {
199 if(o == null) return true;
200 if(o instanceof JSNumber.I) return true;
201 if(o instanceof JSNumber.B) return false;
202 if(o instanceof JSNumber) {
203 JSNumber n = (JSNumber) o;
204 return n.toInt() == n.toDouble();
206 if(o instanceof JSString) {
207 String s = ((JSString)o).s;
208 for(int i=0;i<s.length();i++)
209 if(s.charAt(i) < '0' || s.charAt(i) > '9') return false;
215 public static boolean isString(JS o) {
216 if(o instanceof JSString) return true;
220 public static JS newArray() { return new JSArray(); }
221 public static JS newRegexp(JS pat, JS flags) throws JSExn { return new JSRegexp(pat,flags); }
223 // Instance Methods ////////////////////////////////////////////////////////////////////
225 public final static JS NaN = new JSNumber.D(Double.NaN);
226 public final static JS ZERO = new JSNumber.I(0);
227 public final static JS ONE = new JSNumber.I(1);
228 public final static JS MATH = new JSMath();
230 public static final JS T = new JSNumber.B(true);
231 public static final JS F = new JSNumber.B(false);
233 public static final JS B(boolean b) { return b ? T : F; }
234 public static final JS B(int i) { return i==0 ? F : T; }
236 private static final int CACHE_SIZE = 65536 / 4; // must be a power of two
237 private static final JSString[] stringCache = new JSString[CACHE_SIZE];
238 public static final JS S(String s) {
239 if(s == null) return null;
240 int slot = s.hashCode()&(CACHE_SIZE-1);
241 JSString ret = stringCache[slot];
242 if(ret == null || !ret.s.equals(s)) stringCache[slot] = ret = new JSString(s);
245 public static final JS S(String s, boolean intern) { return intern ? JSString.intern(s) : S(s); }
247 public static final JS N(double d) { return new JSNumber.D(d); }
248 public static final JS N(long l) { return new JSNumber.L(l); }
250 public static final JS N(Number n) {
251 if(n instanceof Integer) return N(n.intValue());
252 if(n instanceof Long) return N(n.longValue());
253 return N(n.doubleValue());
256 private static final JSNumber.I[] smallIntCache = new JSNumber.I[CACHE_SIZE];
257 private static final JSNumber.I[] largeIntCache = new JSNumber.I[CACHE_SIZE];
258 public static final JS N(int i) {
259 JSNumber.I ret = null;
260 int idx = i + smallIntCache.length / 2;
261 if (idx < CACHE_SIZE && idx > 0) {
262 ret = smallIntCache[idx];
263 if (ret != null) return ret;
265 else ret = largeIntCache[Math.abs(idx % CACHE_SIZE)];
266 if (ret == null || ret.i != i) {
267 ret = new JSNumber.I(i);
268 if (idx < smallIntCache.length && idx > 0) smallIntCache[idx] = ret;
269 else largeIntCache[Math.abs(idx % CACHE_SIZE)] = ret;
274 private static Enumeration EMPTY_ENUMERATION = new EmptyEnumeration(null);
276 public static JS fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
277 return JSFunction._fromReader(sourceName, firstLine, sourceCode);
280 // HACK: caller can't know if the argument is a JSFunction or not...
281 public static JS cloneWithNewParentScope(JS j, JSScope s) {
282 return ((JSFunction)j)._cloneWithNewParentScope(s);
286 // Trap support //////////////////////////////////////////////////////////////////////////////
288 /** performs a put, triggering traps if present; traps are run in an unpauseable interpreter */
289 public void putAndTriggerTraps(JS key, JS value) throws JSExn {
290 Trap t = getTrap(key);
291 if(t == null || (t = t.writeTrap()) == null) put(key,value);
292 else new Interpreter(t,value,false).resume();
295 /** performs a get, triggering traps if present; traps are run in an unpauseable interpreter */
296 public JS getAndTriggerTraps(JS key) throws JSExn {
297 Trap t = getTrap(key);
298 if (t == null || (t = t.readTrap()) == null) return get(key);
299 else return new Interpreter(t,null,false).resume();
302 public JS justTriggerTraps(JS key, JS value) throws JSExn {
303 Trap t = getTrap(key);
304 if(t == null || (t = t.writeTrap()) == null) return value;
305 else return new Interpreter(t,value,true).resume();
308 /** adds a trap, avoiding duplicates */
309 final void addTrap(JS key, JSFunction f) throws JSExn {
310 if (f.numFormalArgs > 1) throw new JSExn("traps must take either one argument (write) or no arguments (read)");
311 boolean isRead = f.numFormalArgs == 0;
312 for(Trap t = getTrap(key); t != null; t = t.next) if (t.f == f) return;
313 putTrap(key, new Trap(this, key, f, (Trap)getTrap(key)));
316 /** deletes a trap, if present */
317 final void delTrap(JS key, JSFunction f) throws JSExn {
318 Trap t = (Trap)getTrap(key);
319 if (t == null) return;
320 if (t.f == f) { putTrap(t.target, t.next); return; }
321 for(; t.next != null; t = t.next) if (t.next.f == f) { t.next = t.next.next; return; }