I have attempted the following code snippet:
String data = "new $wnd.Date(2010,0,28,17,8,48,0)";
JSONValue value = JSONParser.parse(data);
To my dismay it returns a JSONNumber !!
Now I looked in the source code (JSONParser.java: parse, evaluate &
createObject) and I created the following test program.
....
String data = "new $wnd.Date(2010,0,28,17,8,48,0)";
myParser(data);
...
private native void myParser(String data) /*-{
var x = eval('(' + data + ')');
$wnd.alert(" typeof = " + typeof x + ", valueOf = " +
x.valueOf());
}-*/;
The alert displays typeof = object and in valueOf = 1264727328000.
Because typeof = object the execution flow calls createObject:
private static native JSONValue createObject(Object o) /*-{
if (!o) {
return @com.google.gwt.json.client.JSONNull::getInstance()();
}
var v = o.valueOf ? o.valueOf() : o;
if (v !== o) {
// It was a primitive wrapper, unwrap it and try again.
var func =
@com.google.gwt.json.client.JSONParser::typeMap[typeof v];
return func ? func(v) :
@com.google.gwt.json.client.JSONParser::throwUnknownTypeException(Ljava/
lang/String;)(typeof v);
} else if (o instanceof Array || o instanceof $wnd.Array) {
// Looks like an Array; wrap as JSONArray.
// NOTE: this test can fail for objects coming from a different
window,
// but we know of no reliable tests to determine if something is
an Array
// in all cases.
return @com.google.gwt.json.client.JSONArray::new(Lcom/google/
gwt/core/client/JavaScriptObject;)(o);
} else {
// This is a basic JavaScript object; wrap as JSONObject.
// Subobjects will be created on demand.
return @com.google.gwt.json.client.JSONObject::new(Lcom/google/
gwt/core/client/JavaScriptObject;)(o);
}
}-*/;
Please note the line:
var v = o.valueOf ? o.valueOf() : o;
What is the reason for doing this? It changes the type of object to
something that is not and that is a number.
Thanks
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