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Updated JamesFormatter from Fun with Named Formats
// http://haacked.com/archive/2009/01/04/fun-with-named-formats-string-parsing-and-edge-cases.aspx#70316
using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Web.UI;
namespace StringLib
{
using System.Web;
public static class JamesFormatter
{
public static string JamesFormat(this string format, object source)
{
return FormatWith(format, null, source);
}
public static string FormatWith(this string format, IFormatProvider provider, object source)
{
if (format == null)
throw new ArgumentNullException("format");
List<object> values = new List<object>();
string rewrittenFormat = Regex.Replace(format,
@"(?<start>\{)+(?<property>[\w\.\[\]]+)(?<format>:[^}]+)?(?<end>\})+",
delegate(Match m)
{
Group startGroup = m.Groups["start"];
Group propertyGroup = m.Groups["property"];
Group formatGroup = m.Groups["format"];
Group endGroup = m.Groups["end"];
values.Add((propertyGroup.Value == "0")
? source
: Eval(source, propertyGroup.Value));
int openings = startGroup.Captures.Count;
int closings = endGroup.Captures.Count;
return openings > closings || openings % 2 == 0
? m.Value
: new string('{', openings) + (values.Count - 1) + formatGroup.Value
+ new string('}', closings);
},
RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
return string.Format(provider, rewrittenFormat, values.ToArray());
}
private static object Eval(object source, string expression)
{
try
{
return DataBinder.Eval(source, expression);
}
catch (HttpException e)
{
throw new FormatException(null, e);
}
}
}
}
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