X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fxwt%2Fjs%2FJSScope.java;h=a504d8d6c5f9ffeac16a05582fe6560988a8671a;hb=6648a20efb79368af2fb16d1694afa685c04a0fc;hp=44bfec1462a54341da05dad53cf3cd613c4b0de6;hpb=8c1756ef3fd42cc2f324baf47e13a83f51045efe;p=org.ibex.core.git

diff --git a/src/org/xwt/js/JSScope.java b/src/org/xwt/js/JSScope.java
index 44bfec1..a504d8d 100644
--- a/src/org/xwt/js/JSScope.java
+++ b/src/org/xwt/js/JSScope.java
@@ -1,42 +1,46 @@
-// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL] 
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL] 
 package org.xwt.js; 
 
 import org.xwt.util.*; 
 import java.io.*;
 import java.util.*;
 
-/** Implementation of a JavaScript JSScope */
-public class JSScope extends JSCallable { 
-    private JSScope parentJSScope;
+// FIXME: should allow parentScope to be a JS, not a JSScope
+/** Implementation of a JavaScript Scope */
+public class JSScope extends JS { 
+
+    private JSScope parentScope;
+
     private static final Object NULL_PLACEHOLDER = new Object();
-    public JSScope(JSScope parentJSScope) {
-        if (parentJSScope == this) throw new Error("can't make a scope its own parent!");
-        this.parentJSScope = parentJSScope;
-    }
 
-    public boolean isTransparent() { return false; }
-    public void declare(String s) { super.put(s, NULL_PLACEHOLDER); }
-    public JSScope getParentJSScope() { return parentJSScope; }
-    public boolean has(Object key) { return super.get(key) != null; }
+    public JSScope(JSScope parentScope) { this.parentScope = parentScope; }
+    public void declare(String s) throws JSExn { super.put(s, NULL_PLACEHOLDER); }
+    public JSScope getParentScope() { return parentScope; }
 
-    public Object get(Object key) {
+    public Object get(Object key) throws JSExn {
         Object o = super.get(key);
         if (o != null) return o == NULL_PLACEHOLDER ? null : o;
-        else return parentJSScope == null ? null : parentJSScope.get(key);
+        else return parentScope == null ? null : parentScope.get(key);
     }
 
-    public void put(Object key, Object val) {
-        if (parentJSScope != null && !has(key)) parentJSScope.put(key, val);
+    public boolean has(Object key) throws JSExn { return super.get(key) != null; }
+    public void put(Object key, Object val) throws JSExn {
+        if (parentScope != null && !has(key)) parentScope.put(key, val);
         else super.put(key, val == null ? NULL_PLACEHOLDER : val);
     }
+    
+    public JSScope top() { 
+        JSScope s = this;
+        while(s.parentScope != null) s = s.parentScope;
+        return s;
+    }
 
     public static class Global extends JSScope {
         private final static Double NaN = new Double(Double.NaN);
         private final static Double POSITIVE_INFINITY = new Double(Double.POSITIVE_INFINITY);
-    
-        public Global(JSScope parent) { super(parent); }
 
-        public Object get(Object key) {
+        public Global() { super(null); }
+        public Object get(Object key) throws JSExn {
             //#switch(key)
             case "NaN": return NaN;
             case "Infinity": return POSITIVE_INFINITY;
@@ -56,47 +60,41 @@ public class JSScope extends JSCallable {
             return super.get(key);
         }
 
-        public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) {
+        public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
             switch(nargs) {
                 case 0: {
                     //#switch(method)
                     case "stringFromCharCode":
-                        JSArray args = new JSArray();
-                        for(int i=0; i<nargs; i++) args.addElement(i==0?a0:i==1?a1:i==2?a2:rest[i-3]);
-                        return stringFromCharCode(args);
-                    default: break;
+                        char buf[] = new char[nargs];
+                        for(int i=0; i<nargs; i++) buf[i] = (char)(JS.toInt(i==0?a0:i==1?a1:i==2?a2:rest[i-3]) & 0xffff);
+                        return new String(buf);
                     //#end
+                    break;
                 }
                 case 1: {
                     //#switch(method)
                     case "parseInt": return parseInt(a0, N(0));
                     case "isNaN": { double d = toDouble(a0); return d == d ? F : T; }
                     case "isFinite": { double d = toDouble(a0); return (d == d && !Double.isInfinite(d)) ? T : F; }
-                    case "decodeURI": throw new JS.Exn("unimplemented");
-                    case "decodeURIComponent": throw new JS.Exn("unimplemented");
-                    case "encodeURI": throw new JS.Exn("unimplemented");
-                    case "encodeURIComponent": throw new JS.Exn("unimplemented");
-                    case "escape": throw new JS.Exn("unimplemented");
-                    case "unescape": throw new JS.Exn("unimplemented");
-                    default: break;
+                    case "decodeURI": throw new JSExn("unimplemented");
+                    case "decodeURIComponent": throw new JSExn("unimplemented");
+                    case "encodeURI": throw new JSExn("unimplemented");
+                    case "encodeURIComponent": throw new JSExn("unimplemented");
+                    case "escape": throw new JSExn("unimplemented");
+                    case "unescape": throw new JSExn("unimplemented");
                     //#end
+                    break;
                 }
                 case 2: {
                     //#switch(method)
                     case "parseInt": return parseInt(a0, a1);
-                    default: break;
                     //#end
+                    break;
                 }
             }
             return super.callMethod(method, a0, a1, a2, rest, nargs);
         }
 
-        private Object stringFromCharCode(JSArray args) {
-            char buf[] = new char[args.length()];
-            for(int i=0;i<args.length();i++) buf[i] = (char)(JS.toInt(args.elementAt(i)) & 0xffff);
-            return new String(buf);
-        }
-
         private Object parseInt(Object arg, Object r) {
             int radix = JS.toInt(r);
             String s = (String)arg;
@@ -117,7 +115,7 @@ public class JSScope extends JSCallable {
                     radix = 16;
                 } else {
                     radix = 8;
-                    if(length == start || Character.digit(s.charAt(start+1),8)==-1) return new Integer(0);
+                    if(length == start || Character.digit(s.charAt(start+1),8)==-1) return JS.ZERO;
                 }
             }
             if(radix == 0) radix = 10;
@@ -125,7 +123,7 @@ public class JSScope extends JSCallable {
             // try the fast way first
             try {
                 String s2 = start == 0 ? s : s.substring(start);
-                return new Integer(sign*Integer.parseInt(s2,radix));
+                return JS.N(sign*Integer.parseInt(s2,radix));
             } catch(NumberFormatException e) { }
             // fall through to a slower but emca-compliant method
             for(int i=start;i<length;i++) {
@@ -134,8 +132,8 @@ public class JSScope extends JSCallable {
                 n = n*radix + digit;
                 if(n < 0) return NaN; // overflow;
             }
-            if(n <= Integer.MAX_VALUE) return new Integer(sign*(int)n);
-            return new Long((long)sign*n);
+            if(n <= Integer.MAX_VALUE) return JS.N(sign*(int)n);
+            return JS.N((long)sign*n);
         }
 
         private Object parseFloat(Object arg) {
@@ -148,7 +146,7 @@ public class JSScope extends JSCallable {
             // trailing garbage
             while(start < end) {
                 try {
-                    return new Double(s.substring(start,length));
+                    return JS.N(s.substring(start,length));
                 } catch(NumberFormatException e) { }
                 end--;
             }