public IkadnBaseObject Parse(IkadnReader reader)
{
reader.SkipWhiteSpaces();
string expressionText = reader.ReadUntil(EndingChar);
reader.Read();
if (expressionText.Length == 0)
{
throw new FormatException("Expression at " + reader.PositionDescription + " is empty (zero length)");
}
ExpressionParser expressionParser = new ExpressionParser(expressionText);
expressionParser.Parse();
if (expressionParser.errors.count > 0)
{
throw new FormatException("Invalid expression at " + reader.PositionDescription + ". Errors: " + expressionParser.errors.errorMessages);
}
if (!reader.HasNextObject())
{
throw new FormatException("IKON value expected at " + reader.PositionDescription);
}
if (expressionParser.ParsedFormula.Variables.Count == 0)
{
throw new FormatException("Condition expression at " + reader.PositionDescription + " is constant. If intentional, use format witout condition.");
}
//TODO(later) substitute subformulas
return(new ConditionalText(expressionParser.ParsedFormula, reader.ReadObject().To <IText>()));
}
