public static boolean toBoolean(Object o) {
if (o == null) return false;
if (o instanceof Boolean) return ((Boolean)o).booleanValue();
- if (o instanceof Number) return o.equals(new Integer(0));
+ 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(); }
public static Number toNumber(Object o) {
if (o == null) return new Long(0);
if (o instanceof Number) return ((Number)o);
- if (o instanceof String) try { return new Double((String)o); } catch (NumberFormatException e) { return new Double(0); }
+
+ // 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 new Double((String)o); } catch (NumberFormatException e) { return new Double(Double.NaN); }
if (o instanceof Boolean) return ((Boolean)o).booleanValue() ? new Long(1) : new Long(0);
if (o instanceof JS) return ((JS)o).coerceToNumber();
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 JS) return ((JS)o).coerceToString();
+ if(o instanceof Double || o instanceof Float) {
+ double d = ((Number)o).doubleValue();
+ if((int)d == d) return Integer.toString((int)d);
+ return o.toString();
+ }
+ return o.toString();
+ }
+
// Instance Methods ////////////////////////////////////////////////////////////////////
public abstract Object get(Object key) throws JS.Exn;
public abstract void put(Object key, Object val) throws JS.Exn;
public abstract Object[] keys();
-
- public Number coerceToNumber() { throw new Error("you cannot coerce a " + this.getClass().getName() + " into a Number"); }
- public String coerceToString() { throw new Error("you cannot coerce a " + this.getClass().getName() + " into a String"); }
- public boolean coerceToBoolean() { throw new Error("you cannot coerce a " + this.getClass().getName() + " into a Boolean"); }
+ public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
+ if(checkOnly) return Boolean.FALSE;
+ Object o = get(method);
+ if(o instanceof JS.Callable) {
+ return ((JS.Callable)o).call(args);
+ } else if(o == null) {
+ throw new JS.Exn("Attempted to call non-existent method: " + method);
+ } else {
+ throw new JS.Exn("Attempted to call a non-method: " +method);
+ }
+ }
+
+ public Number coerceToNumber() { return new Integer(0); }
+ public String coerceToString() { throw new JS.Exn("tried to coerce a JavaScript object to a String"); }
+ public boolean coerceToBoolean() { return true; }
+
+ public String typeName() { return "object"; }
// Inner Classes /////////////////////////////////////////////////////////////////////////
/** A sensible implementation of the abstract methods in the JS class */
public static class Obj extends JS {
- private Hash entries = new Hash();
+ private Hash entries = null;
private boolean sealed = false;
public Obj() { this(false); }
public Obj(boolean sealed) { this.sealed = sealed; }
- /** a sealed object cannot have its properties modified */
- public void setSeal(boolean sealed) { this.sealed = sealed; }
- public Object get(Object key) { return entries.get(key); }
- public void put(Object key, Object val) { if (!sealed) entries.put(key, val); }
- public Object[] keys() { return(entries.keys()); }
+ public void setSeal(boolean sealed) { this.sealed = sealed; } ///< a sealed object cannot have its properties modified
+ public void put(Object key, Object val) { put(key, null, val); }
+ protected void put(Object key, Object key2, Object val) {
+ if (sealed) return;
+ if (entries == null) entries = new Hash();
+ entries.put(key, key2, val); }
+ public Object[] keys() { return entries == null ? new Object[0] : entries.keys(); }
+ public Object get(Object key) { return get(key, null); }
+ protected Object get(Object key, Object key2) {
+ if (entries == null) return null;
+ if(key2 == null && callMethod((String)key, null, true) == Boolean.TRUE)
+ return new Internal.CallableStub(this, key);
+ return entries.get(key, key2);
+ }
}
/** An exception which can be thrown and caught by JavaScript code */
public Object elementAt(int i) { return super.elementAt(i); }
public void addElement(Object o) { super.addElement(o); }
public void setElementAt(Object o, int i) { super.setElementAt(o, i); }
+ public Object get(Object key) { return super._get(key); }
+ public void put(Object key, Object val) { super._put(key, val); }
}
/** Any object which becomes part of the scope chain must support this interface */
/** transparent scopes are not returned by THIS */
public boolean isTransparent() { return super.isTransparent(); }
public boolean has(Object key) { return super.has(key); }
- public Object get(Object key) { return super.get(key); }
- public void put(Object key, Object val) { super.put(key, val); }
+ public Object get(Object key) { return super._get(key); }
+ public void put(Object key, Object val) { super._put(key, val); }
public void declare(String s) { super.declare(s); }
}
/** a Callable which was compiled from JavaScript code */
public static class CompiledFunction extends CompiledFunctionImpl {
- public Object call(JS.Array args, JS.Scope scope) throws JS.Exn { return super.call(args, scope); }
+ public int getNumFormalArgs() { return numFormalArgs; }
CompiledFunction(String sourceName, int firstLine, Reader sourceCode, Scope scope) throws IOException {
super(sourceName, firstLine, sourceCode, scope);
}
}
+
+ /** a scope that is populated with js objects and functions normally found in the global scope */
+ public static class GlobalScope extends GlobalScopeImpl {
+ public GlobalScope() { this(null); }
+ public GlobalScope(JS.Scope parent) { super(parent); }
+ }
public static final JS Math = new org.xwt.js.Math();
CompiledFunction currentCompiledFunction = null;
Vec stack = new Vec();
- int line = -1;
+ int pc;
/** binds this thread to the current Java Thread */
public void bindToCurrentJavaThread() { javaThreadToJSThread.put(java.lang.Thread.currentThread(), this); }
/** returns the line of code that is currently executing */
- public int getLine() { return line; }
+ public int getLine() { return currentCompiledFunction == null ? -1 : currentCompiledFunction.getLine(pc); }
/** returns the name of the source code file which declared the currently executing function */
public String getSourceName() { return currentCompiledFunction == null ? null : currentCompiledFunction.getSourceName(); }
return ret;
}
+ public static JS.Thread currentJSThread() {
+ return fromJavaThread(java.lang.Thread.currentThread());
+ }
}
}