private ExpressionToken fetchNextToken()
{
char cur = _inputData[_currentIndex];
var token = _tokenMapper.Map(cur);
_currentIndex++;
switch (token)
{
case EExpressionTokenType.ParenthesesOpen:
return(ExpressionToken.CreateToken(_currentIndex - 1, "(", EExpressionTokenType.ParenthesesOpen));
case EExpressionTokenType.ParenthesesClose:
return(ExpressionToken.CreateToken(_currentIndex - 1, ")", EExpressionTokenType.ParenthesesClose));
case EExpressionTokenType.Digit:
return(tokenizeNumber(cur));
case EExpressionTokenType.Whitespace:
return(ExpressionToken.CreateToken(_currentIndex - 1, " ", EExpressionTokenType.Whitespace));
case EExpressionTokenType.Add:
return(ExpressionToken.CreateToken(_currentIndex - 1, "+", EExpressionTokenType.Add));
case EExpressionTokenType.Sub:
return(ExpressionToken.CreateToken(_currentIndex - 1, "-", EExpressionTokenType.Sub));
case EExpressionTokenType.Mult:
return(ExpressionToken.CreateToken(_currentIndex - 1, "*", EExpressionTokenType.Mult));
case EExpressionTokenType.Div:
return(ExpressionToken.CreateToken(_currentIndex - 1, "/", EExpressionTokenType.Div));
}
throw new TokenizationException(cur.ToString(), _currentIndex);
}
private ExpressionToken fetchNextToken()
{
char cur = _inputData[_currentIndex];
var token = _tokenMapper.Map(cur);
_currentIndex++;
switch (token)
{
case EExpressionTokenType.ParenthesesOpen:
return(ExpressionToken.CreateToken(_currentIndex - 1, "(", EExpressionTokenType.ParenthesesOpen));
case EExpressionTokenType.ParenthesesClose:
return(ExpressionToken.CreateToken(_currentIndex - 1, ")", EExpressionTokenType.ParenthesesClose));
case EExpressionTokenType.Digit:
return(tokenizeNumber(cur));
case EExpressionTokenType.Whitespace:
return(ExpressionToken.CreateToken(_currentIndex - 1, " ", EExpressionTokenType.Whitespace));
case EExpressionTokenType.Add:
return(ExpressionToken.CreateToken(_currentIndex - 1, "+", EExpressionTokenType.Add));
case EExpressionTokenType.Sub:
return(ExpressionToken.CreateToken(_currentIndex - 1, "-", EExpressionTokenType.Sub));
case EExpressionTokenType.Mult:
return(ExpressionToken.CreateToken(_currentIndex - 1, "*", EExpressionTokenType.Mult));
case EExpressionTokenType.Div:
return(ExpressionToken.CreateToken(_currentIndex - 1, "/", EExpressionTokenType.Div));
}
throw new ParseException(String.Format("Error at position {0}: \"{1}\" is not a valid input", _inputData.IndexOf(cur) + 1, cur)); // unmatched )
}
