internal static int GetNextToken(string source, int position, out Token token, Token prevToken = null)
{
char symbol = source[position];
token = null;
if (DoubleToken.IsStartSymbol(symbol))
{
token = new DoubleToken().FromString(source, ref position);
return position;
}
if (BracketToken.IsStartSymbol(symbol))
{
token = BracketToken.GetBracket(symbol, prevToken);
return position + 1;
}
if (OperationToken.TryGetOperation(symbol, prevToken, out token))
{
return position + 1;
}
if (FunctionToken.IsStartSymbol(symbol))
{
token = new FunctionToken().FromString(source, ref position);
return position;
}
throw new ArgumentOutOfRangeException("symbol", symbol, "Unexpected symbol");
}
public void TestMethod_NewDoubleToken_IntString()
{
string intString = "123";
int position = 0;
var token = new DoubleToken().FromString(intString, ref position) as DoubleToken;
Assert.AreEqual(123D, token.Value);
}
public void TestMethod_NewDoubleToken_DoubleStringGetFromMiddleString()
{
string doubleString = "123.45.6";
int position = 4;
var token = new DoubleToken().FromString(doubleString, ref position) as DoubleToken;
Assert.AreEqual(45.6, token.Value);
}
