Separate out the (, ), |,not etc. by splitting the string up based on what you
find. You could add some logic to split the string into an array from where
those characters are found and look to the values to the left if an OR (||) is
found, for example. Then put that logic into a function like below:
(Add in your complex logic to a function like this:)
/**
* Converts a string representation of a boolean to a true boolean value.
* For example, it will convert "TRUE", "False", "true", "TruE", "f", or
"T" to a real boolean (true or false).
* The input string is not case-sensitive. Acceptable arguments are the
word "true" or "false", or the letter "t" or "f".
* @param value the string to convert to a boolean.
* @return representation of the string as a true boolean value.
**/
public static function stringToBoolean(value:String):Boolean
{
var boolean:Boolean = false;
if (value.toLowerCase() == "true") boolean = true;
if (value.toLowerCase() == "t") boolean = true;
return boolean;
}
No small task though.
Jason Merrill
Instructional Technology Architect II
Bank of America Global Learning
_______________________
From: [email protected] [mailto:[email protected]] On Behalf
Of BillF
Sent: Thursday, January 26, 2012 12:36 PM
To: [email protected]
Subject: [flexcoders] Evaluating a Boolean String Expression
So, I have a string expression that I need to evaluate as a boolean result. Any
ideas on how to do that? The expression can be in any valid boolean format..
example1: "(true && false) || true", evaluate to true
example2: "false || (true && not true)", evaluate to false
example3: "false || true", evaluate to true
example4: "true && false", evaluate to false
example5: "true"
TIA
Bill
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