Esempio n. 1
0
        protected override Variable Evaluate(ParsingScript script)
        {
            // 1. Get the name of the variable.
            string varName = Utils.GetToken(script, Constants.NEXT_OR_END_ARRAY);

            Utils.CheckNotEnd(script, Constants.CONTAINS);

            // 2. Get the current value of the variable.
            List <Variable> arrayIndices = Utils.GetArrayIndices(ref varName);

            ParserFunction func = ParserFunction.GetFunction(varName);

            Utils.CheckNotNull(varName, func);
            Variable currentValue = func.GetValue(script);

            // 2b. Special dealings with arrays:
            Variable query = arrayIndices.Count > 0 ?
                             Utils.ExtractArrayElement(currentValue, arrayIndices) :
                             currentValue;

            // 3. Get the value to be looked for.
            Variable searchValue = Utils.GetItem(script);

            Utils.CheckNotEnd(script, Constants.CONTAINS);

            // 4. Check if the value to search for exists.
            bool exists = query.Exists(searchValue, true /* notEmpty */);

            script.MoveBackIf(Constants.START_GROUP);
            return(new Variable(exists));
        }