public void EmptyMessageReturnsEmptyEnumerable()
{
var lexer = new StringCalculatorLexer(string.Empty);
var tokens = lexer.Read();
Assert.That(tokens, Is.Empty);
}
public IEnumerable<int> Parse(string message)
{
var lexer = new StringCalculatorLexer(message);
var delimiters = new HashSet<string>();
string numbersString = null;
foreach (var token in lexer.Read())
{
if (token is DelimiterToken)
{
delimiters.Add(token.Content);
}
if (token is NumbersToken)
{
numbersString = token.Content;
}
}
if (string.IsNullOrEmpty(numbersString))
{
return Enumerable.Empty<int>();
}
var numberSplitter = delimiters.Any() ?
delimiters.GenerateSplitter() :
_defaultSplitter;
return numberSplitter
.Split(numbersString)
.Select(int.Parse);
}
public void NoStartingDoubleSlashReturnsSingleNumberToken()
{
var lexer = new StringCalculatorLexer("1,2,3");
var tokens = lexer.Read().ToArray();
var numbers = tokens.First();
Assert.That(tokens.Count(), Is.EqualTo(1));
Assert.That(numbers.GetType(), Is.EqualTo(typeof(NumbersToken)));
Assert.That(numbers.Content, Is.EqualTo("1,2,3"));
}
public void MultipleCaharacterDelimitersCanBeSpecified()
{
var lexer = new StringCalculatorLexer("//[:-]\n1:-2");
var tokens = lexer.Read().ToArray();
var delimiter = tokens[2];
var numbers = tokens[5];
Assert.That(tokens.Count(), Is.EqualTo(6));
Assert.That(tokens[0], Is.EqualTo(DelimiterSpecStart.Token));
Assert.That(tokens[1], Is.EqualTo(MultiCharacterDelimiterStart.Token));
Assert.That(delimiter.GetType(), Is.EqualTo(typeof(DelimiterToken)));
Assert.That(delimiter.Content, Is.EqualTo(":-"));
Assert.That(tokens[3], Is.EqualTo(MultiCharacterDelimiterEnd.Token));
Assert.That(tokens[4], Is.EqualTo(DelimiterSpecEnd.Token));
Assert.That(numbers.GetType(), Is.EqualTo(typeof(NumbersToken)));
Assert.That(numbers.Content, Is.EqualTo("1:-2"));
}
public void SingleCharacterDelimitersCanBeSpecified()
{
var lexer = new StringCalculatorLexer("//;_\n1;2_3");
var tokens = lexer.Read().ToArray();
var semiColon = tokens[1];
var underScore = tokens[2];
var numbers = tokens[4];
Assert.That(tokens.Count(), Is.EqualTo(5));
Assert.That(tokens[0], Is.EqualTo(DelimiterSpecStart.Token));
Assert.That(semiColon.GetType(), Is.EqualTo(typeof(DelimiterToken)));
Assert.That(semiColon.Content, Is.EqualTo(";"));
Assert.That(underScore.GetType(), Is.EqualTo(typeof(DelimiterToken)));
Assert.That(underScore.Content, Is.EqualTo("_"));
Assert.That(tokens[3], Is.EqualTo(DelimiterSpecEnd.Token));
Assert.That(numbers.GetType(), Is.EqualTo(typeof(NumbersToken)));
Assert.That(numbers.Content, Is.EqualTo("1;2_3"));
}