interpret strings as literals...

Question

Is there a simple way to interpret a string value literally? I have "( object.propery.value <= object2.propery.value )" as user input in a text field and need to come up with the literal boolean value of (object.propery.value <= object2.propery.value). The format is always the same, but I am having trouble with the boolean always being true for a non-empty string.

I tried

private function ifCompare(str:String) : Boolean

{

var params:Object = str.split(" ");

var param1:Object = getValue(params[1]);

var operator:String = params[2];

var param2:Object = getValue(params[3]);

var eval:Boolean = false;

switch(operator)

{

case ">=":

eval = (param1 >= param2);

break;

case ">":

eval = (param1 > param2);

break;

case "<=":

eval = (param1 <= param2);

break;

case "<":

eval = (param1 < param2);

break;

case "==":

case "=":

eval = (param1 == param2);

break;

case "!=":

case "<>":

eval = (param1 != param2);

break;

}

return eval;

}

This returns mixed results and I still have the && and || to deal with. It would be so much easier to be able to say "This is not a string! It is a literal!" Can I do that?

_spoboyle · Answer

I have a demo here you might find useful

MyClass.as

package  
{
    import flash.text.TextField;
    
    public class MyClass 
    {
        public var tf:TextField;
        
        public function MyClass() 
        {
            tf = new TextField();
            tf.text = "somthing or other";
        }   
    }
}

and

package
{
    import flash.display.Sprite;
    import flash.events.Event;
    [SWF(backgroundColor="#ffffff", width=400, height=400, frameRate=60)]
    public class Main extends Sprite
    {
        public function Main()
        {
            if (stage)
            {
                init();
            }
            else
            {
                addEventListener(Event.ADDED_TO_STAGE, init);
            }
        }
        
        public function init(event:Event=null):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            
            var myClass:MyClass = new MyClass();
            
            var string:String = "tf.text.length";
            var values:Array = string.split(".");
            
            trace(myClass[values[0]][values[1]][values[2]]);
        }
    }
}

I can't currently think of a way to get hold of the myClass instance though

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