// Attempts to parse a number from the beginning of the given input string. Returns the character size of the matched string.
static (double, int) GetNextNumber(string input, INumberParser numberParser)
{
// Attempt to parse anything before an operator or space as a number
Regex regex = new Regex("^-?([^-+/*\\(\\)\\^\\s]+)");
var match = regex.Match(input);
if (match.Success)
{
// Might be a number
var matchLength = match.Groups[0].Length;
var parsedNum = ApiInformation.IsTypePresent(numberParser?.GetType().FullName)
? numberParser.ParseDouble(input.Substring(0, matchLength))
: double.TryParse(input.Substring(0, matchLength), out var d)
? (double?)d
: null;
if (parsedNum != null)
{
// Parsing was successful
return(parsedNum.Value, matchLength);
}
}
return(double.NaN, 0);
}
// Attempts to parse a number from the beginning of the given input string. Returns the character size of the matched string.
private static Tuple <double, int> GetNextNumber(string input, INumberParser numberParser)
{
// Attempt to parse anything before an operator or space as a number
string regex = "^-?([^-+/*\\(\\)\\^\\s]+)";
Match match = Regex.Match(input, regex);
if (match.Success)
{
// Might be a number
var parsedNum = numberParser.ParseDouble(match.Value);
if (parsedNum.HasValue)
{
// Parsing was successful
return(new Tuple <double, int>(parsedNum.Value, match.Length));
}
}
return(new Tuple <double, int>(double.NaN, 0));
}