/// <summary>
/// Reads the next character off of the input stream and advances the current position.
/// Throws an exception if the character is not a letter.
/// </summary>
/// <returns></returns>
public SourceChar ReadLetter()
{
var peek = this.Peek();
if (!(StringValidator.IsUpperAlpha(peek.Value) || StringValidator.IsLowerAlpha(peek.Value)))
{
throw new UnexpectedCharacterException(peek);
}
return(this.Read());
}
public static void IsLowerAlphaTest(char value, bool expectedResult)
{
var result = StringValidator.IsLowerAlpha(value);
Assert.AreEqual(expectedResult, result);
}