/// <summary>
/// Creates a double dense vector based on a string. The string can be in the following formats (without the
/// quotes): 'n', 'n,n,..', '(n,n,..)', '[n,n,...]', where n is a double.
/// </summary>
/// <returns>
/// A double dense vector containing the values specified by the given string.
/// </returns>
/// <param name="value">
/// the string to parse.
/// </param>
/// <param name="formatProvider">
/// An <see cref="IFormatProvider"/> that supplies culture-specific formatting information.
/// </param>
public static DenseVector Parse(string value, IFormatProvider formatProvider)
{
if (value == null)
{
throw new ArgumentNullException(value);
}
value = value.Trim();
if (value.Length == 0)
{
throw new FormatException();
}
// strip out parens
if (value.StartsWith("(", StringComparison.Ordinal))
{
if (!value.EndsWith(")", StringComparison.Ordinal))
{
throw new FormatException();
}
value = value.Substring(1, value.Length - 2).Trim();
}
if (value.StartsWith("[", StringComparison.Ordinal))
{
if (!value.EndsWith("]", StringComparison.Ordinal))
{
throw new FormatException();
}
value = value.Substring(1, value.Length - 2).Trim();
}
// keywords
var textInfo = formatProvider.GetTextInfo();
var keywords = new[] { textInfo.ListSeparator };
// lexing
var tokens = new LinkedList<string>();
GlobalizationHelper.Tokenize(tokens.AddFirst(value), keywords, 0);
var token = tokens.First;
if (token == null || tokens.Count.IsEven())
{
throw new FormatException();
}
// parsing
var data = new double[(tokens.Count + 1) >> 1];
for (int i = 0; i < data.Length; i++)
{
if (token == null || token.Value == textInfo.ListSeparator)
{
throw new FormatException();
}
data[i] = Double.Parse(token.Value, NumberStyles.Any, formatProvider);
token = token.Next;
if (token != null)
{
token = token.Next;
}
}
return new DenseVector(data);
}