X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fxwt%2Fjs%2FJS.java;h=7c2cc19d2e23a1fdbdb9f34fdd38c26db7633fa6;hb=11fb6d3f994008abe6c16b4402c3904a543e240e;hp=51929afcd099cfc260285db7d4a27cfc65aba487;hpb=9b9482f2939c8cb7526a8ca7ff43a7f2c2b5f97a;p=org.ibex.core.git

diff --git a/src/org/xwt/js/JS.java b/src/org/xwt/js/JS.java
index 51929af..7c2cc19 100644
--- a/src/org/xwt/js/JS.java
+++ b/src/org/xwt/js/JS.java
@@ -1,55 +1,165 @@
 // Copyright 2002 Adam Megacz, see the COPYING file for licensing [GPL] 
- 
+
 package org.xwt.js; 
 import org.xwt.util.*; 
- 
+import java.io.*;
+import java.util.*;
+
 /** The public API for the JS engine */
-public interface JS { 
+// FEATURE: try using mutable, recycled 'Num' objects
+public abstract class JS { 
+
+    // Static Methods //////////////////////////////////////////////////////////////////////
+
+    public static Function getCurrentFunction() {
+	return (Function)currentFunction.get(Thread.currentThread());
+    }
+    public static String getCurrentFunctionSourceName() {
+	return getCurrentFunctionSourceName(Thread.currentThread());
+    }
+    public static String getCurrentFunctionSourceName(Thread t) {
+	Function f = (Function)currentFunction.get(t);
+	if (f == null) return "null";
+	return f.getSourceName();
+    }
+    public static String getFileAndLine() {
+	return "unknown:??";
+    }
+
+
+    // Instance Methods ////////////////////////////////////////////////////////////////////
  
-    public Object get(Object key) throws JS.Exn; 
-    public Object put(Object key, Object val) throws JS.Exn; 
-    public Object[] enumerateProperties(); 
-    public String coerceToString() throws JS.Exn; 
-    /*
-    public Num coerceToNumber() throws JS.Exn; 
-    public boolean coerceToBoolean() throws JS.Exn; 
-    public Object call(Object[] args) throws JS.Exn; 
-    */
-    /** if JS calls a Java method, and the Java method throws an exception, it can only be caught by JS if it is a subclass of Exn. */ 
+    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"); }
+
+
+    // Subclasses /////////////////////////////////////////////////////////////////////////
+
+    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; }
+	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 static class Exn extends RuntimeException { 
 	private Object js = null; 
 	public Exn(Object js) { this.js = js; } 
+	public String toString() { return "JS.Exn: " + js.toString(); }
+	public String getMessage() { return toString(); }
 	public Object getObject() { return js; } 
     } 
- 
+
+    public static class Array extends Obj {
+	private Vec vec = new Vec();
+	private static int intVal(Object o) {
+	    if (o instanceof Number) {
+		int intVal = ((Number)o).intValue();
+		if (intVal == ((Number)o).doubleValue()) return intVal;
+		return Integer.MIN_VALUE;
+	    }
+	    if (!(o instanceof String)) return Integer.MIN_VALUE;
+	    String s = (String)o;
+	    for(int i=0; i<s.length(); i++) if (s.charAt(i) < '0' || s.charAt(i) > '9') return Integer.MIN_VALUE;
+	    return Integer.parseInt(s);
+	}
+	public Object get(Object key) {
+	    // FIXME: HACK!
+	    if (key.equals("cascade")) return org.xwt.Trap.cascadeFunction;
+	    if (key.equals("length")) return new Long(vec.size());
+	    int i = intVal(key);
+	    if (i == Integer.MIN_VALUE) return super.get(key);
+	    return vec.elementAt(i);
+	}
+	public void put(Object key, Object val) {
+	    if (key.equals("length")) vec.setSize(Parser.toNumber(val).intValue());
+	    int i = intVal(key);
+	    if (i == Integer.MIN_VALUE) super.put(key, val);
+	    else vec.setElementAt(val, i);
+	}
+	public Object[] keys() {
+	    Object[] sup = super.keys();
+	    Object[] ret = new Object[vec.size() + 1 + sup.length];
+	    System.arraycopy(sup, 0, ret, vec.size(), sup.length);
+	    for(int i=0; i<vec.size(); i++) ret[i] = new Integer(i);
+	    ret[vec.size()] = "length";
+	    return ret;
+	}
+	public int length() { return vec.size(); }
+	public Object elementAt(int i) { return vec.elementAt(i); }
+	public void addElement(Object o) { vec.addElement(o); }
+	public void setElementAt(Object o, int i) { vec.setElementAt(o, i); }
+    }
+
+    public static Hashtable currentFunction = new Hashtable();
+    public static abstract class Function extends Obj {
+	public abstract Object _call(JS.Array args) throws JS.Exn;
+	public String getSourceName() throws JS.Exn { return "unknown"; }
+	public final Object call(JS.Array args) throws JS.Exn { return _call(args); }
+    }
+
+    public static class Script extends Function {
+	Parser.Expr e = null;
+	private Script(Parser.Expr e) { this.e = e; }
+	public Object _call(JS.Array args) throws JS.Exn {
+	    Scope rootScope = (Scope)args.elementAt(0);
+	    try {
+		e.eval(rootScope);
+	    } catch (Parser.ReturnException e) {
+		// ignore
+	    } catch (Parser.ControlTransferException e) {
+		throw new JS.Exn("block threw a ControlTransferException: " + e);
+	    }
+	    return null;
+	}
+	public static Script parse(Reader r, String sourceName, int line) throws IOException {
+	    Parser p = new Parser(r, sourceName, line);
+	    p.pushBackToken(Lexer.LC);  // FIXME: hack
+	    try {
+		return new Script(p.parseBlock(true));
+	    } catch (Exception e) {
+		if (Log.on) Log.log(Parser.class, e);
+		return null;
+	    }
+	}
+    }
+
     /** Any object which becomes part of the scope chain must support this interface */ 
-    public static interface Scope extends JS { 
-	public boolean has(Object key); 
-	public void declare(String s);
-	public JS getParentScope(); 
+    public static class Scope extends Obj { 
+	private Scope parentScope;
+	private static Object NULL = new Object();
+	public Scope(Scope parentScope) { this(parentScope, false); }
+	public Scope(Scope parentScope, boolean sealed) { super(sealed); this.parentScope = parentScope; }
+	public Scope getParentScope() { return parentScope; }
+
+	// transparent scopes are not returned by THIS
+	public boolean isTransparent() { return false; }
+
+	public boolean has(Object key) { return super.get(key) != null; }
+	public Object get(Object key) {
+	    if (!has(key)) return parentScope == null ? null : getParentScope().get(key);
+	    Object ret = super.get(key); return ret == NULL ? null : ret;
+	}
+	public void put(Object key, Object val) {
+	    if (!has(key) && parentScope != null) getParentScope().put(key, val);
+	    else super.put(key, val == null ? NULL : val);
+	}
+	public Object[] keys() { throw new Error("you can't enumerate the properties of a Scope"); }
+	public void declare(String s) { if (isTransparent()) getParentScope().declare(s); else super.put(s, NULL);}
     } 
  
-    /** A mutable, boxed numeric value.  These are recycled -- never duplicate references -- use duplicate() instead. */ 
-	/*
-    public static class Num implements Cloneable, JS { 
-	 
-	private Num() { } 
-	public boolean isDouble = false; 
-	public long longVal = -1; 
-	public double doubleVal = -1; 
-	 
-	private static Vec pool = new Vec(); 
-	public static synchronized void recycle(Num n) { pool.push(n); } 
-	public static synchronized Num getOne() { return (pool.size() > 0) ? (Num)pool.pop() : new Num(); } 
-	 
-	public Num duplicate() { try { return (Num)clone(); } catch (CloneNotSupportedException c) { throw new Error(c); } } 
- 
-	public Object get(Object key) throws JS.Exn { return null; } 
-	public Object put(Object key, Object val) throws JS.Exn { throw new JS.Exn("attempt to set a property on a Number"); } 
-	public Object[] enumerateProperties() { return new Object[] { }; } 
-	public String coerceToString() throws JS.Exn { return isDouble ? String.valueOf(doubleVal) : String.valueOf(longVal); } 
-	public Num coerceToNumber() throws JS.Exn { return duplicate(); } 
-	public Object call(Object[] args) throws JS.Exn { throw new JS.Exn("attempt to apply the () operator to a Number"); } 
-    } 
-	*/
+
 } 
+
+
+
+