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Updated HenriFormatter from Named Formats Redux
// http://haacked.com/archive/2009/01/14/named-formats-redux.aspx#70485
using System;
using System.Text;
using System.Web;
using System.Web.UI;
namespace StringLib
{
public static class HenriFormatter
{
public static string HenriFormat(this string format, object source)
{
if (format == null)
throw new ArgumentNullException("format");
var result = new StringBuilder(format.Length * 2);
var expression = new StringBuilder();
var e = format.GetEnumerator();
while (e.MoveNext())
{
var ch = e.Current;
if (ch == '{')
{
while (true)
{
if (!e.MoveNext())
throw new FormatException();
ch = e.Current;
if (ch == '}')
{
result.Append(OutExpression(source, expression.ToString()));
expression.Length = 0;
break;
}
if (ch == '{')
{
result.Append(ch);
break;
}
expression.Append(ch);
}
}
else if (ch == '}')
{
if (!e.MoveNext() || e.Current != '}')
throw new FormatException();
result.Append('}');
}
else
{
result.Append(ch);
}
}
return result.ToString();
}
private static string OutExpression(object source, string expression)
{
string format = "{0}";
int colonIndex = expression.IndexOf(':');
if (colonIndex > 0)
{
format = "{0:" + expression.Substring(colonIndex + 1) + "}";
expression = expression.Substring(0, colonIndex);
}
try
{
return DataBinder.Eval(source, expression, format) ?? string.Empty;
}
catch (HttpException)
{
throw new FormatException();
}
}
}
}
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