2003/08/10 06:08:00

[org.ibex.core.git] / src / org / xwt / js / JS.java

diff --git a/src/org/xwt/js/JS.java b/src/org/xwt/js/JS.java
index 542d465..be1fd2c 100644 (file)
--- a/src/org/xwt/js/JS.java
+++ b/src/org/xwt/js/JS.java
@@ -59,6 +59,20 @@ public abstract class JS {
         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; 
@@ -66,9 +80,9 @@ public abstract class JS {
     public abstract Object[] keys(); 
     public abstract Object callMethod(Object method, JS.Array args, boolean justChecking);
 
-    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 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"; }
 
@@ -148,6 +162,12 @@ public abstract class JS {
             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();