Subj : Re: Access a property faster
To   : Egor Senin
From : Igor Bukanov
Date : Thu Nov 18 2004 11:50 am

Egor Senin wrote:
> Igor Bukanov <igor@fastmail.fm> wrote in message news:<419BA6A6.1080709@fastmail.fm>...
> 
>>Egor Senin wrote:
>>
>>>...
>>>Is there any other way to retrive property without a script-class
>>>compilation but with all required traverses of prototype chain and
>>>parent scopes, something like ctx.getProperty(myScriptable,
>>>"propertyName");
>>
>>Use ScriptableObject.getProperty(myScriptable, "properyName"),
>>http://www.mozilla.org/rhino/apidocs/org/mozilla/javascript/ScriptableObject.html#getProperty(org.mozilla.javascript.Scriptable,%20java.lang.String)
> 
> 
> Hmm, it seems that this method doesn't traverse parent scopes, just
> prototype chain ... Sorry, I had to mention that I need any native
> objects or variables returned too when it's name is specified.
> 
> Consider the call ctx.evaluateString(myScriptable, "Math",
> "NowNativeObjectAccess", 1, null);
> 
> It returns Math object after the top scope is reached.
> 
> So, which code I should write in order to fully emulate the presented
> ctx.evaluateString() call?

There is no public API in Rhino for that. As a workarround you can code 
explicit scope lookup like in:

Object result;
do {
     result = ScriptableObject.getProperty(myScriptable, "properyName");
     if (result != Scriptable.NOT_FOUND) break;
     myScriptable = myScriptable.getParentScope();
} while (myScriptable != null);

Regards, Igor

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