コード例 #1
0
        /// <summary>
        /// Evaluates function represented by this node.
        /// </summary>
        /// <param name="context">Context to evaluate expressions against.</param>
        /// <param name="evalContext">Current expression evaluation context.</param>
        /// <returns>Result of the function evaluation.</returns>
        protected override object Get(object context, EvaluationContext evalContext)
        {
            string               name   = this.getText();
            IDictionary          locals = evalContext.LocalVariables;
            LambdaExpressionNode lambda = locals[name] as LambdaExpressionNode;

            if (lambda == null)
            {
                throw new InvalidOperationException("Function '" + name + "' is not defined.");
            }

            object[] argValues = ResolveArguments(evalContext);

            try
            {
                return(GetValueWithArguments(lambda, context, evalContext, argValues));
            }
            catch (ArgumentMismatchException ame)
            {
                throw new InvalidOperationException("Failed executing function '" + name + "': " + ame.Message);
            }
        }
コード例 #2
0
        /// <summary>
        /// Evaluates function represented by this node.
        /// </summary>
        /// <param name="context">Context to evaluate expressions against.</param>
        /// <param name="evalContext">Current expression evaluation context.</param>
        /// <returns>Result of the function evaluation.</returns>
        protected override object Get(object context, EvaluationContext evalContext)
        {
            string name = this.getText();

            object[] argValues = ResolveArguments(evalContext);

            object function = evalContext.Variables[name];

            // delegate?
            Delegate callback = function as Delegate;

            if (callback != null)
            {
                return(InvokeDelegate(callback, argValues));
            }

            // lambda?
            LambdaExpressionNode lambda = function as LambdaExpressionNode;

            if (lambda != null)
            {
                try
                {
                    return(GetValueWithArguments(lambda, context, evalContext, argValues));
                }
                catch (ArgumentMismatchException ame)
                {
                    throw new InvalidOperationException("Failed executing function " + name + ": " + ame.Message);
                }
            }

            if (function == null)
            {
                throw new InvalidOperationException("Function '" + name + "' is not defined.");
            }
            throw new InvalidOperationException("Function '" + name + "' is defined but of unknown type.");
        }