public void ReadTest()
{
ValueStringReader sc = new ValueStringReader("Hello");
Assert.IsTrue(sc.HasNext);
Assert.AreEqual('H', sc.Read());
Assert.AreEqual('e', sc.Read());
Assert.AreEqual('l', sc.Read());
Assert.AreEqual('l', sc.Read());
Assert.AreEqual('o', sc.Read());
Assert.IsFalse(sc.HasNext);
}
public void NextTest()
{
ValueStringReader sc = new ValueStringReader("Hello");
Assert.AreEqual('H', sc.Next);
sc.Read();
Assert.AreEqual('e', sc.Next);
sc.Read();
Assert.AreEqual('l', sc.Next);
sc.Read();
Assert.AreEqual('l', sc.Next);
sc.Read();
Assert.AreEqual('o', sc.Next);
sc.Read();
Assert.IsNull(sc.Next);
}
public void PrevTest()
{
ValueStringReader sc = new ValueStringReader("Hello");
Assert.IsNull(sc.Prev);
sc.Read();
Assert.IsNull(sc.Prev);
sc.Read();
Assert.AreEqual('H', sc.Prev);
sc.Read();
Assert.AreEqual('e', sc.Prev);
sc.Read();
Assert.AreEqual('l', sc.Prev);
sc.Read();
Assert.AreEqual('l', sc.Prev);
sc.Read();
Assert.AreEqual('l', sc.Prev);
Assert.AreEqual('o', sc.Current);
Assert.IsFalse(sc.HasNext);
}
/// <summary>
/// Gets an array with all the tokens of the given expression.
/// </summary>
/// <param name="expression">The expression to split.</param>
/// <returns>An array with the tokens of the expression.</returns>
public static string[] ToStringArray(string expression)
{
if (string.IsNullOrWhiteSpace(expression))
{
return(Array.Empty <string>());
}
List <string> tokens = new List <string>();
ValueStringReader scanner = new ValueStringReader(expression);
char curChar;
while (scanner.HasNext)
{
curChar = scanner.Read();
if (char.IsLetter(curChar))
{
StringBuilder sb = StringBuilderCache.Acquire();
do
{
sb.Append(curChar);
char?nextChar = scanner.Next;
if (nextChar != null && char.IsLetterOrDigit(nextChar.Value))
{
curChar = scanner.Read();
}
else
{
break;
}
}while (true);
tokens.Add(StringBuilderCache.ToStringAndRelease(ref sb !));
}
else if (char.IsDigit(curChar))
{
StringBuilder sb = StringBuilderCache.Acquire();
bool hasDecimalPoint = false;
do
{
if (curChar == '.' && !hasDecimalPoint)
{
hasDecimalPoint = true;
}
sb.Append(curChar);
char?nextChar = scanner.Next;
if (nextChar != null && (char.IsDigit(nextChar.Value) || (nextChar == '.' && !hasDecimalPoint)))
{
curChar = scanner.Read();
}
else
{
break;
}
}while (true);
tokens.Add(StringBuilderCache.ToStringAndRelease(ref sb !));
}
else
{
if (char.IsWhiteSpace(curChar))
{
continue;
}
tokens.Add(curChar.ToString());
}
}
return(tokens.ToArray());
}