/// <summary>
/// Parses a complex number string into a <see cref="ComplexNumber"/> object.
/// </summary>
/// <param name="statement">
/// The statement to parse.
/// </param>
/// <returns>
/// The <see cref="ComplexNumber"/> parsed from the string. Null if parsing failed.
/// </returns>
public static ComplexNumber Parse(string statement)
{
const string pattern = @"(^([-]?[\d]+))?(([+-]+)([\d]+)?i)?";
if (Regex.IsMatch(statement, pattern))
{
var number = new ComplexNumber();
var matches = Regex.Match(statement, pattern);
if (matches.Groups.Count != 0)
{
// imaginary part is present
if (matches.Groups.Count > 2)
{
// imaginary operator
var imSign = matches.Groups[4].Value;
if (matches.Groups.Count > 5)
{
// imaginary part
double imPart;
if (!double.TryParse(matches.Groups[5].Value, out imPart))
{
return null;
}
number.Im = imPart;
}
else
{
number.Im = 1;
}
if (imSign == "-")
{
number.Im *= -1;
}
}
// real part
double rePart;
if (!double.TryParse(matches.Groups[1].Value, out rePart))
{
return null;
}
number.Re = rePart;
return number;
}
}
return null;
}
/// <summary>
/// Tries to parse the statement to a <see cref="ComplexNumber"/>
/// </summary>
/// <param name="statement">
/// The statement to parse.
/// </param>
/// <param name="complexNumber">
/// The <see cref="ComplexNumber"/> parsed from the string. A new one if parsing failed.
/// </param>
/// <returns>
/// True if parse succeeded and false otherwise.
/// </returns>
public static bool TryParse(string statement, out ComplexNumber complexNumber)
{
var parsedNumber = Parse(statement);
if (parsedNumber == null)
{
complexNumber = new ComplexNumber();
return false;
}
complexNumber = parsedNumber;
return true;
}
/// <summary>
/// Returns the Equality when the type is correct.
/// </summary>
/// <param name="other">
/// The other object.
/// </param>
/// <returns>
/// The <see cref="bool"/> indicating equality.
/// </returns>
protected bool Equals(ComplexNumber other)
{
return this.Re.Equals(other.Re) && this.Im.Equals(other.Im);
}
/// <summary>
/// Returns the Equality when the type is correct.
/// </summary>
/// <param name="other">
/// The other object.
/// </param>
/// <returns>
/// The <see cref="bool"/> indicating equality.
/// </returns>
protected bool Equals(ComplexNumber other)
{
return(this.Re.Equals(other.Re) && this.Im.Equals(other.Im));
}