private static ValidationFailure TryParseItem(string formatItem, out FormatStringItem formatStringItem)
{
formatStringItem = null;
var matchResult = StringFormatItemRegex.Match(formatItem);
if (!matchResult.Success)
{
return(ValidationFailure.FormatItemMalformed);
}
var index = int.Parse(matchResult.Groups["Index"].Value);
var alignment = matchResult.Groups["Alignment"].Success ? (int?)int.Parse(matchResult.Groups["Alignment"].Value) : null;
var formatString = matchResult.Groups["Format"].Success ? matchResult.Groups["Format"].Value : null;
formatStringItem = new FormatStringItem(index, alignment, formatString);
return(null);
}
private static ValidationFailure TryParseItem(string formatItem, out FormatStringItem formatStringItem)
{
formatStringItem = null;
var indexOfComma = formatItem.IndexOf(',');
var indexOfColon = formatItem.IndexOf(':');
var split = formatItem.Split(',', ':');
if (indexOfComma >= 0 && indexOfColon >= 0 && indexOfColon < indexOfComma ||
split.Length > 3)
{
return(ValidationFailure.FormatItemMalformed);
}
int index;
int? alignment = null;
string formatString = null;
if (!int.TryParse(split[0], out index))
{
return(ValidationFailure.FormatItemIndexIsNaN);
}
if (indexOfComma >= 0)
{
int localAlignment;
if (!int.TryParse(split[1], out localAlignment))
{
return(ValidationFailure.FormatItemAlignmentIsNaN);
}
alignment = localAlignment;
}
if (indexOfColon >= 0)
{
formatString = indexOfComma >= 0
? split[2]
: split[1];
}
formatStringItem = new FormatStringItem(index, alignment, formatString);
return(null);
}