/// <summary>
/// Determines whether a user's answer is valid.
/// </summary>
public static bool AnswerIsValid(Question question, string input)
{
// Allow time-varying inputs
// TODO: Validate these
if (input.StartsWith("{") & input.EndsWith("}")) return true;
// Allow "unstated"
if (input.Trim() == "?") return true;
// Otherwise, see if the input is consistent with the question type
string qType = question.questionType;
if (qType == "Tbool") return BoolIsValid(input);
else if (qType == "Tnum") return NumberIsValid(question, input);
else if (qType == "Tdate") return DateIsValid(question, input);
return true;
}
/// <summary>
/// Adds the assertion relationship to the .akk unit test text.
/// </summary>
public static string AddUnitTestAssertRel(Facts.Fact theF, Question theQ)
{
string result = "- " + theQ.relationship + "(" + ((Thing)theF.Arg1).Id;
if (theF.Arg2 == null)
{
// e.g. Rel(p) =
result += ") = ";
}
else
{
// e.g. Rel(p,q) =
result += "," + ((Thing)theF.Arg2).Id + ") = ";
}
return result;
}
/// <summary>
/// Validates date inputs.
/// </summary>
private static bool DateIsValid(Question question, string input)
{
try
{
DateTime theDate = DateTime.Parse(input);
}
catch
{
return false;
}
// Here you could validate that the number is between two
// preset earliest and latest acceptable dates...
return true;
}
/// <summary>
/// Validates numeric inputs.
/// </summary>
private static bool NumberIsValid(Question question, string input)
{
if (input.Trim() == "") return false;
// Is the value a number at all?
string answer = input.Trim('$');
if (!IsNumber(input))
{
return false;
}
// Here you could validate that the number is between some
// preset minimum and maximum values...
return true;
}
