X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fxwt%2Fjs%2FJS.java;h=327d35c4875523188324556b26a32776d02d1bd6;hb=8c1756ef3fd42cc2f324baf47e13a83f51045efe;hp=885d840781e921c06ab5ad9cdf36b668dc3b1bb3;hpb=308cbbe7be5a020b654771ea07ff07f13475793a;p=org.ibex.core.git diff --git a/src/org/xwt/js/JS.java b/src/org/xwt/js/JS.java index 885d840..327d35c 100644 --- a/src/org/xwt/js/JS.java +++ b/src/org/xwt/js/JS.java @@ -2,25 +2,22 @@ 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 */ @@ -54,12 +51,13 @@ public abstract class JS { // 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 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"; @@ -76,52 +74,39 @@ public abstract class JS { // 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 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); - } - } + // 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; } - 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; } + 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 = null; - private boolean sealed = false; - public Obj() { this(false); } - public Obj(boolean sealed) { this.sealed = sealed; } - 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 static class Exn extends RuntimeException { private Object js = null; @@ -131,41 +116,17 @@ 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); } - } - /** the result of a graft */ - public static class Graft extends JS { + // FIXME: uber-broken + public static class Graft extends JSCallable { private JS graftee; private Object replaced_key; private Object replaced_val; - public Graft(JS graftee, Object key, Object val) { - if (graftee instanceof Array) throw new JS.Exn("can't graft onto Arrays (yet)"); - if (graftee instanceof Callable) throw new JS.Exn("can't graft onto Callables (yet)"); - if (graftee instanceof Scope) throw new JS.Exn("can't graft onto Scopes (yet)"); - this.graftee = graftee; + 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; } @@ -173,83 +134,37 @@ public abstract class JS { 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 callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn { - if (!replaced_key.equals(method)) return graftee.callMethod(method, args, checkOnly); - if (replaced_val instanceof Callable) return checkOnly ? Boolean.TRUE : ((Callable)replaced_val).call(args); - if (checkOnly) return Boolean.FALSE; - throw new JS.Exn("attempt to call non-function"); + /* + 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 Object[] keys() { - Object[] ret = graftee.keys(); - for(int i=0; ijava.lang.Thread mapping is 1:1 */ - public static class Thread { - - CompiledFunction currentCompiledFunction = null; - Vec stack = new Vec(); - 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 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(); } - - /** 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 static JS.Thread currentJSThread() { - return fromJavaThread(java.lang.Thread.currentThread()); + 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; + } + } + }; } } }