+++ /dev/null
-// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
-package org.xwt.js;
-
-import org.xwt.util.*;
-import org.xwt.*;
-import java.io.*;
-import java.util.*;
-
-/** The minimum set of functionality required for objects which are manipulated by JavaScript */
-public class JS extends org.xwt.util.BalancedTree {
-
- public static final Object METHOD = new Object();
- public final JS unclone() { return _unclone(); }
- public Enumeration keys() throws JSExn { return entries == null ? emptyEnumeration : entries.keys(); }
- public Object get(Object key) throws JSExn { return entries == null ? null : entries.get(key, null); }
- public void put(Object key, Object val) throws JSExn { (entries==null?entries=new Hash():entries).put(key,null,val); }
- public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
- throw new JSExn("attempted to call the null value (method "+method+")");
- }
- public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
- throw new JSExn("you cannot call this object (class=" + this.getClass().getName() +")");
- }
-
- JS _unclone() { return this; }
- public static class Cloneable extends JS {
- public Cloneable() { }
- public Object jsclone() throws JSExn {
- return new Clone(this);
- }
- }
-
- public static class Clone extends JS.Cloneable {
- protected JS.Cloneable clonee = null;
- JS _unclone() { return clonee.unclone(); }
- public JS.Cloneable getClonee() { return clonee; }
- public Clone(JS.Cloneable clonee) { this.clonee = clonee; }
- public boolean equals(Object o) {
- if (!(o instanceof JS)) return false;
- return unclone() == ((JS)o).unclone();
- }
- public Enumeration keys() throws JSExn { return clonee.keys(); }
- public Object get(Object key) throws JSExn { return clonee.get(key); }
- public void put(Object key, Object val) throws JSExn { clonee.put(key, val); }
- public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
- return clonee.callMethod(method, a0, a1, a2, rest, nargs);
- }
- public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
- return clonee.call(a0, a1, a2, rest, nargs);
- }
- }
-
- // Static Interpreter Control Methods ///////////////////////////////////////////////////////////////
-
- /** log a message with the current JavaScript sourceName/line */
- public static void log(Object message) { info(message); }
- public static void debug(Object message) { Log.debug(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
- public static void info(Object message) { Log.info(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
- public static void warn(Object message) { Log.warn(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
- public static void error(Object message) { Log.error(Interpreter.getSourceName() + ":" + Interpreter.getLine(), message); }
-
- public static class NotPauseableException extends Exception { NotPauseableException() { } }
-
- /** returns a callback which will restart the context; expects a value to be pushed onto the stack when unpaused */
- public static UnpauseCallback pause() throws NotPauseableException {
- Interpreter i = Interpreter.current();
- if (i.pausecount == -1) throw new NotPauseableException();
- i.pausecount++;
- return new JS.UnpauseCallback(i);
- }
-
- public static class UnpauseCallback implements Scheduler.Task {
- Interpreter i;
- UnpauseCallback(Interpreter i) { this.i = i; }
- public void perform() throws JSExn { unpause(null); }
- public void unpause(Object o) throws JSExn {
- // FIXME: if o instanceof JSExn, throw it into the JSworld
- i.stack.push(o);
- i.resume();
- }
- }
-
-
-
- // Static Helper Methods ///////////////////////////////////////////////////////////////////////////////////
-
- /** coerce an object to a Boolean */
- public static boolean toBoolean(Object o) {
- if (o == null) return false;
- if (o instanceof Boolean) return ((Boolean)o).booleanValue();
- if (o instanceof Long) return ((Long)o).longValue() != 0;
- if (o instanceof Integer) return ((Integer)o).intValue() != 0;
- if (o instanceof Number) {
- double d = ((Number) o).doubleValue();
- // NOTE: d == d is a test for NaN. It should be faster than Double.isNaN()
- return d != 0.0 && d == d;
- }
- if (o instanceof String) return ((String)o).length() != 0;
- return true;
- }
-
- /** coerce an object to a Long */
- public static long toLong(Object o) { return toNumber(o).longValue(); }
-
- /** coerce an object to an Int */
- public static int toInt(Object o) { return toNumber(o).intValue(); }
-
- /** coerce an object to a Double */
- public static double toDouble(Object o) { return toNumber(o).doubleValue(); }
-
- /** coerce an object to a Number */
- public static Number toNumber(Object o) {
- if (o == null) return ZERO;
- if (o instanceof Number) return ((Number)o);
-
- // NOTE: There are about 3 pages of rules in ecma262 about string to number conversions
- // We aren't even close to following all those rules. We probably never will be.
- if (o instanceof String) try { return N((String)o); } catch (NumberFormatException e) { return N(Double.NaN); }
- if (o instanceof Boolean) return ((Boolean)o).booleanValue() ? N(1) : ZERO;
- throw new Error("toNumber() got object of type " + o.getClass().getName() + " which we don't know how to handle");
- }
-
- /** coerce an object to a String */
- public static String toString(Object o) {
- if(o == null) return "null";
- if(o instanceof String) return (String) o;
- if(o instanceof Integer || o instanceof Long || o instanceof Boolean) return o.toString();
- if(o instanceof JSArray) return o.toString();
- if(o instanceof JSDate) return o.toString();
- if(o instanceof Double || o instanceof Float) {
- double d = ((Number)o).doubleValue();
- if((int)d == d) return Integer.toString((int)d);
- return o.toString();
- }
- throw new RuntimeException("can't coerce that!");
- }
-
- // Instance Methods ////////////////////////////////////////////////////////////////////
-
- public static final Integer ZERO = new Integer(0);
-
- // this gets around a wierd fluke in the Java type checking rules for ?..:
- public static final Object T = Boolean.TRUE;
- public static final Object F = Boolean.FALSE;
-
- public static final Boolean B(boolean b) { return b ? Boolean.TRUE : Boolean.FALSE; }
- public static final Boolean B(int i) { return i==0 ? Boolean.FALSE : Boolean.TRUE; }
- public static final Number N(String s) { return s.indexOf('.') == -1 ? N(Integer.parseInt(s)) : new Double(s); }
- public static final Number N(double d) { return (int)d == d ? N((int)d) : new Double(d); }
- public static final Number N(long l) { return N((int)l); }
-
- private static final Integer[] smallIntCache = new Integer[65535 / 4];
- private static final Integer[] largeIntCache = new Integer[65535 / 4];
- public static final Number N(int i) {
- Integer ret = null;
- int idx = i + smallIntCache.length / 2;
- if (idx < smallIntCache.length && idx > 0) {
- ret = smallIntCache[idx];
- if (ret != null) return ret;
- }
- else ret = largeIntCache[Math.abs(idx % largeIntCache.length)];
- if (ret == null || ret.intValue() != i) {
- ret = new Integer(i);
- if (idx < smallIntCache.length && idx > 0) smallIntCache[idx] = ret;
- else largeIntCache[Math.abs(idx % largeIntCache.length)] = ret;
- }
- return ret;
- }
-
- private static Enumeration emptyEnumeration = new Enumeration() {
- public boolean hasMoreElements() { return false; }
- public Object nextElement() { throw new NoSuchElementException(); }
- };
-
- private Hash entries = null;
-
- public static JS fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
- return JSFunction._fromReader(sourceName, firstLine, sourceCode);
- }
-
- // HACK: caller can't know if the argument is a JSFunction or not...
- public static JS cloneWithNewParentScope(JS j, JSScope s) {
- return ((JSFunction)j)._cloneWithNewParentScope(s);
- }
-
-
- // Trap support //////////////////////////////////////////////////////////////////////////////
-
- /** override and return true to allow placing traps on this object.
- * if isRead true, this is a read trap, otherwise write trap
- **/
- protected boolean isTrappable(Object name, boolean isRead) { return true; }
-
- /** performs a put, triggering traps if present; traps are run in an unpauseable interpreter */
- public void putAndTriggerTraps(Object key, Object value) throws JSExn {
- Trap t = getTrap(key);
- if (t != null) t.invoke(value);
- else put(key, value);
- }
-
- /** performs a get, triggering traps if present; traps are run in an unpauseable interpreter */
- public Object getAndTriggerTraps(Object key) throws JSExn {
- Trap t = getTrap(key);
- if (t != null) return t.invoke();
- else return get(key);
- }
-
- /** retrieve a trap from the entries hash */
- protected final Trap getTrap(Object key) {
- return entries == null ? null : (Trap)entries.get(key, Trap.class);
- }
-
- /** retrieve a trap from the entries hash */
- protected final void putTrap(Object key, Trap value) {
- if (entries == null) entries = new Hash();
- entries.put(key, Trap.class, value);
- }
-
- /** adds a trap, avoiding duplicates */
- protected final void addTrap(Object name, JSFunction f) throws JSExn {
- if (f.numFormalArgs > 1) throw new JSExn("traps must take either one argument (write) or no arguments (read)");
- boolean isRead = f.numFormalArgs == 0;
- if (!isTrappable(name, isRead)) throw new JSExn("not allowed "+(isRead?"read":"write")+" trap on property: "+name);
- for(Trap t = getTrap(name); t != null; t = t.next) if (t.f == f) return;
- putTrap(name, new Trap(this, name.toString(), f, (Trap)getTrap(name)));
- }
-
- /** deletes a trap, if present */
- protected final void delTrap(Object name, JSFunction f) {
- Trap t = (Trap)getTrap(name);
- if (t == null) return;
- if (t.f == f) { putTrap(t.name, 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