/// <summary>
/// Expands properties and items in the argument, and verifies that the result is consistent
/// with a scalar parameter type.
/// </summary>
/// <param name="function">Function name for errors</param>
/// <param name="argumentNode">Argument to be expanded</param>
/// <returns>Scalar result</returns>
private string ExpandArgumentForScalarParameter(string function, GenericExpressionNode argumentNode, ConditionEvaluator.IConditionEvaluationState state)
{
string argument = argumentNode.GetUnexpandedValue(state);
IList <TaskItem> items;
items = state.ExpandIntoTaskItems(argument);
string expandedValue = String.Empty;
if (items.Count == 0)
{
// Empty argument, that's fine.
}
else if (items.Count == 1)
{
expandedValue = items[0].ItemSpec;
}
else // too many items for the function
{
// We only allow a single item to be passed into a scalar parameter.
ProjectErrorUtilities.ThrowInvalidProject(
state.ElementLocation,
"CannotPassMultipleItemsIntoScalarFunction", function, argument,
state.ExpandIntoString(argument));
}
return(expandedValue);
}
/// <summary>
/// Value after any item and property expressions are expanded
/// </summary>
/// <returns></returns>
internal override string GetExpandedValue(ConditionEvaluator.IConditionEvaluationState state)
{
if (_cachedExpandedValue == null)
{
if (_expandable)
{
_cachedExpandedValue = state.ExpandIntoString(_value);
}
else
{
_cachedExpandedValue = _value;
}
}
return(_cachedExpandedValue);
}