public override Sentence Parse(string sentence, ParseTableReader reader)
{
original = sentence;
string[] tokenStrings = sentence.Split(new char[] { ' ' }).Where(s => s != "").ToArray <string>();
List <Token> parsedTokens = new List <Token>();
type = SentenceTypes.CommodityDefinition;
for (int i = 0; i < tokenStrings.Length; i++)
{
int result;
if (reader.GetTranslationForAlienDigit(tokenStrings[i].Trim().ToLower()) != Char.MinValue)
{
if (i == 0 || parsedTokens.Last().Type == TokenTypes.AlienDigit)
{
parsedTokens.Add(new Token(tokenStrings[i], TokenTypes.AlienDigit));
alienDigits += reader.GetTranslationForAlienDigit(tokenStrings[i]);
}
else
{
throw new FormatException();
}
}
else if (tokenStrings[i].Equals("is", StringComparison.CurrentCultureIgnoreCase))
{
parsedTokens.Add(new Token(tokenStrings[i], TokenTypes.Equality));
}
else if (tokenStrings[i].Equals("Credits", StringComparison.CurrentCultureIgnoreCase))
{
parsedTokens.Add(new Token(tokenStrings[i], TokenTypes.Unit));
}
else if (int.TryParse(tokenStrings[i], out result))
{
if (parsedTokens.Last().Type == TokenTypes.Equality && RomanNumber.Parse(alienDigits) > 0)
{
parsedTokens.Add(new Token(tokenStrings[i], TokenTypes.UnitPrice));
unitPrice = float.Parse(tokenStrings[i]) / RomanNumber.Parse(alienDigits);
}
else
{
throw new FormatException();
}
}
else if (parsedTokens.Last()?.Type == TokenTypes.AlienDigit)
{
parsedTokens.Add(new Token(tokenStrings[i], TokenTypes.Commodity));
commodityName = tokenStrings[i];
}
}
return(this);
}
public override Sentence Parse(string sentence, ParseTableReader reader)
{
original = sentence;
string pattern = @"(how much|how many credits|how many Credits) (is)";
string pattern2 = @"(\w+)+";
var tokens1 = Regex.Split(sentence, pattern).Where(s => s != string.Empty).ToList <string>();
string combinedTokens = tokens1.Last();
string[] tokenStrings = Regex.Split(combinedTokens, pattern2).Where(s => s.Trim() != string.Empty && s.Trim() != "?").ToArray <string>();
List <Token> tokens = new List <Token>();
for (int i = 0; i < tokenStrings.Length; i++)
{
if (reader.GetTranslationForAlienDigit(tokenStrings[i]) != Char.MinValue)
{
if (i == 0 || tokens.Last().Type == Enums.TokenTypes.AlienDigit)
{
tokens.Add(new Token(tokenStrings[i], Enums.TokenTypes.AlienDigit));
alienDigits += reader.GetTranslationForAlienDigit(tokenStrings[i]);
}
else
{
throw new FormatException();
}
}
else if (reader.IsValidCommodity(tokenStrings[i]))
{
if (tokens.Last().Type == Enums.TokenTypes.AlienDigit && RomanNumber.Parse(alienDigits) > 0)
{
if (i == tokenStrings.Length - 1) //if commodity definition, then it has to be the last
{
commodityName = tokenStrings[i];
type = Enums.SentenceTypes.CommodityValueQuery;
tokens.Add(new Token(commodityName, Enums.TokenTypes.AlienDigit));
}
else
{
throw new FormatException();
}
}
}
else
{
throw new FormatException();
}
if (i == tokens.Count - 1)
{
RomanNumber.Parse(alienDigits); //would throw exception if alien digits dont obey the roman number rules
}
}
return(this);
}
/// <summary>
/// evaluate a parsed query statement
/// </summary>
/// <param name="query"></param>
/// <returns></returns>
public int Evaluate(Sentence query)
{
if (query.Type == SentenceTypes.CommodityValueQuery)
{
var t = (query as Query).GetCommodityQueryTerms();
int numberOfItems = RomanNumber.Parse(t.Item1);
float unitPrice = parseTables.GetReader().GetCommodityUnitPrice(t.Item2);
return((int)(numberOfItems * unitPrice));
}
else if (query.Type == SentenceTypes.RomanNumberTranslationQuery)
{
var t = (query as Query).GetAlienDigitsForQuery();
return(RomanNumber.Parse(t));
}
else
{
throw new ArgumentException("object of type query is expected");
}
}