Subj : Re: Controlling evaluation of an expression
To   : netscape.public.mozilla.jseng
From : zwetan
Date : Thu Dec 02 2004 08:41 am

Hi,

>
> I was wondering whether there is a way for me to control the
> evaluation of certain expressions in Rhino.  For example, normally
> myObject.property evaluates to the integer value 1.  But in the
> context of a certain function call:
>
> myHostObject.myFunction( myObject.property )
>
> I would like for Rhino not to evaluate myObject.property because it
> has a different meaning in this context.  Is this possible?
>

why not simply define the meaning of the context by code ?

for ex:

specialInteger = function( /*Int*/ num )
    {
    this._value = num;
    }

specialInteger.prototype.toSpecialContext = function()
    {
    //whatever you need here
    }

specialInteger.prototype.valueOf = function()
    {
    return this._value;
    }


myObject = {};
myObject.property = new specialInteger( 1 );

//for normal context the property will evaluate to its valueOf
myHostObject.myFunction( myObject.property )

//for a particular context:
myHostObject.myFunction( myObject.property.toSpecialContext() )

and same question here: what are you trying to do ?

zwetan

.