X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fxwt%2Fjs%2FJS.java;h=327d35c4875523188324556b26a32776d02d1bd6;hb=8c1756ef3fd42cc2f324baf47e13a83f51045efe;hp=094eba1b8444462e683bb44ba0d516fda431070e;hpb=10d0296318104e8b9ac8afbea71ef118aa77387c;p=org.ibex.core.git diff --git a/src/org/xwt/js/JS.java b/src/org/xwt/js/JS.java index 094eba1..327d35c 100644 --- a/src/org/xwt/js/JS.java +++ b/src/org/xwt/js/JS.java @@ -2,38 +2,45 @@ package org.xwt.js; import org.xwt.util.*; +import org.xwt.*; import java.io.*; import java.util.*; /** * The public API for the JS engine. JS itself is actually a class * implementing the absolute minimal amount of functionality for an - * Object which can be manipulated by JavaScript code. The static - * methods, fields, and inner classes of JS define the publicly - * visible API for the XWT JavaScript engine; code outside this - * package should never depend on anything not defined in this file. + * Object which can be manipulated by JavaScript code. */ -public abstract class JS { - +public class JS { // Public Helper Methods ////////////////////////////////////////////////////////////////////// /** parse and compile a function */ - public static CompiledFunction parse(String sourceName, int firstLine, Reader sourceCode) throws IOException { - return new CompiledFunction(sourceName, firstLine, sourceCode, null); + public static JSFunction parse(String sourceName, int firstLine, Reader sourceCode) throws IOException { + return new JSFunction(sourceName, firstLine, sourceCode, null); } /** 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 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(); } @@ -41,39 +48,65 @@ public abstract class JS { 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"); } + // 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; + + // FEATURE: be smart here; perhaps intern + public static final Number N(int i) { return new Integer(i); } + public static final Number N(long l) { return new Long(l); } + public static final Number N(double d) { return new Double(d); } + public static final Boolean B(boolean b) { return b ? Boolean.TRUE : Boolean.FALSE; } + + private static Enumeration emptyEnumeration = new Enumeration() { + public boolean hasMoreElements() { return false; } + public Object nextElement() { throw new NoSuchElementException(); } + }; + + private Hash entries = null; + public Enumeration keys() { return entries == null ? emptyEnumeration : entries.keys(); } + public Object get(Object key) { return entries == null ? null : entries.get(key, null); } + public void put(Object key, Object val) { if (entries == null) entries = new Hash(); entries.put(key, null, val); } + + // note that we don't actually implement trappable... we just provide these for subclasses which choose to + public JSTrap getTrap(Object key) { return entries == null ? null : (JSTrap)entries.get(key, JSTrap.class); } + public void putTrap(Object key, JSTrap t) { if (entries == null) entries = new Hash(); entries.put(key, JSTrap.class, t); } + + public Number coerceToNumber() { throw new JS.Exn("tried to coerce a JavaScript object to a Number"); } + public String coerceToString() { throw new JS.Exn("tried to coerce a JavaScript object to a String"); } + public boolean coerceToBoolean() { throw new JS.Exn("tried to coerce a JavaScript object to a Boolean"); } + + 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 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()); } - } - /** An exception which can be thrown and caught by JavaScript code */ public static class Exn extends RuntimeException { private Object js = null; @@ -83,80 +116,56 @@ public abstract class JS { public Object getObject() { return js; } } - /** The publicly-visible face of JavaScript Array objects */ - public static class Array extends ArrayImpl { - public Array() { } - public Array(int size) { super(size); } - public void setSize(int i) { super.setSize(i); } - public int length() { return super.length(); } - 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 */ - public static class Scope extends ScopeImpl { - public Scope(Scope parentScope) { this(parentScope, false); } - public Scope(Scope parentScope, boolean sealed) { super(parentScope, sealed); } - /** 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 void declare(String s) { super.declare(s); } - } - - /** anything that is callable with the () operator */ - public static abstract class Callable extends JS.Obj { - public abstract Object call(JS.Array args) throws JS.Exn; - } - - /** 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); } - CompiledFunction(String sourceName, int firstLine, Reader sourceCode, Scope scope) throws IOException { - super(sourceName, firstLine, sourceCode, scope); + /** the result of a graft */ + // FIXME: uber-broken + public static class Graft extends JSCallable { + private JS graftee; + private Object replaced_key; + private Object replaced_val; + public Graft(Object graftee, Object key, Object val) { + if (graftee instanceof JSArray) throw new JS.Exn("can't graft onto JSArrays (yet)"); + if (graftee instanceof JSCallable) throw new JS.Exn("can't graft onto JSCallables (yet)"); + if (graftee instanceof JSScope) throw new JS.Exn("can't graft onto JSScopes (yet)"); + this.graftee = (JS)graftee; + replaced_key = key; + replaced_val = val; } - } - - public static final JS Math = new org.xwt.js.Math(); - - /** encapsulates a single JavaScript thread; the JS.Thread->java.lang.Thread mapping is 1:1 */ - public static class Thread { - - CompiledFunction currentCompiledFunction = null; - Vec stack = new Vec(); - int line = -1; - - /** 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; } - - /** returns the name of the source code file which declared the currently executing function */ - public String getSourceName() { return currentCompiledFunction == null ? null : currentCompiledFunction.getSourceName(); } - - /** fetches the currently-executing javascript function */ - public JS.CompiledFunction getCurrentCompiledFunction() { return currentCompiledFunction; } - - - // Statics /////////////////////////////////////////////////////////////////////// - - private static Hashtable javaThreadToJSThread = new Hashtable(); - - /** returns the JS thread for a given Java thread, creating one if necessary */ - public static JS.Thread fromJavaThread(java.lang.Thread t) { - JS.Thread ret = (JS.Thread)javaThreadToJSThread.get(t); - if (ret == null) { - ret = new JS.Thread(); - ret.bindToCurrentJavaThread(); - } - return ret; + public boolean equals(Object o) { return (this == o || graftee.equals(o)); } + public int hashCode() { return graftee.hashCode(); } + public Object get(Object key) { return replaced_key.equals(key) ? replaced_val : graftee.get(key); } + public void put(Object key, Object val) { graftee.put(key, val); } + /* + public Object call(Object method, JSArray args) { + if (replaced_key.equals(method)) return ((JSCallable)replaced_val).call(null, args); + else if (graftee instanceof JSCallable) return ((JSCallable)graftee).call(method, args); + else throw new JS.Exn("cannot call this value"); + } + */ + public Number coerceToNumber() { return graftee.coerceToNumber(); } + public String coerceToString() { return graftee.coerceToString(); } + public boolean coerceToBoolean() { return graftee.coerceToBoolean(); } + public String typeName() { return graftee.typeName(); } + public Enumeration keys() { + return new Enumeration() { + Enumeration graftee_enumeration = graftee.keys(); + boolean returned_replaced = false; + public boolean hasMoreElements() { + if (graftee_enumeration.hasMoreElements()) return true; + return !returned_replaced; + } + public Object nextElement() { + if (!graftee_enumeration.hasMoreElements()) { + if (returned_replaced) throw new NoSuchElementException(); + returned_replaced = true; + return replaced_key; + } else { + Object ret = graftee_enumeration.nextElement(); + if (!returned_replaced && ret.equals(replaced_key)) returned_replaced = true; + return ret; + } + } + }; } - } }