private static string FormatImpl(string format,
IFormatProvider provider, StringFormatTokenBindingHandler binder, params object[] args)
{
if (format == null)
throw new ArgumentNullException("format");
Debug.Assert(binder != null);
//
// Following is a slightly modified version of the parser from
// Henri Weichers that was presented at:
// http://haacked.com/archive/2009/01/14/named-formats-redux.aspx
// See also the following comment about the modifications:
// http://haacked.com/archive/2009/01/14/named-formats-redux.aspx#70485
//
StringBuilder result = new StringBuilder(format.Length * 2);
StringBuilder token = new StringBuilder();
CharEnumerator e = format.GetEnumerator();
while (e.MoveNext())
{
char ch = e.Current;
if (ch == '{')
{
while (true)
{
if (!e.MoveNext())
throw new FormatException();
ch = e.Current;
if (ch == '}')
{
if (token.Length == 0)
throw new FormatException();
result.Append(binder(token.ToString(), args, provider));
token.Length = 0;
break;
}
if (ch == '{')
{
result.Append(ch);
break;
}
token.Append(ch);
}
}
else if (ch == '}')
{
if (!e.MoveNext() || e.Current != '}')
throw new FormatException();
result.Append('}');
}
else
{
result.Append(ch);
}
}
return result.ToString();
}
public static string Format(string format,
IFormatProvider provider, StringFormatTokenBindingHandler binder, params object[] args)
{
return FormatImpl(format, provider, binder != null ? binder : DefaultTokenBinder, args);
}
public static string Format(string format, StringFormatTokenBindingHandler binder, params object[] args)
{
return Format(format, null, binder, args);
}
private static string FormatImpl(string format,
IFormatProvider provider, StringFormatTokenBindingHandler binder, params object[] args)
{
if (format == null)
{
throw new ArgumentNullException("format");
}
Debug.Assert(binder != null);
//
// Following is a slightly modified version of the parser from
// Henri Weichers that was presented at:
// http://haacked.com/archive/2009/01/14/named-formats-redux.aspx
// See also the following comment about the modifications:
// http://haacked.com/archive/2009/01/14/named-formats-redux.aspx#70485
//
var result = new StringBuilder(format.Length * 2);
var token = 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 == '}')
{
if (token.Length == 0)
{
throw new FormatException();
}
result.Append(binder(token.ToString(), args, provider));
token.Length = 0;
break;
}
if (ch == '{')
{
result.Append(ch);
break;
}
token.Append(ch);
}
}
else if (ch == '}')
{
if (!e.MoveNext() || e.Current != '}')
{
throw new FormatException();
}
result.Append('}');
}
else
{
result.Append(ch);
}
}
return(result.ToString());
}
public static string Format(string format,
IFormatProvider provider, StringFormatTokenBindingHandler binder, params object[] args)
{
return(FormatImpl(format, provider, binder != null ? binder : DefaultTokenBinder, args));
}
public static string Format(string format, StringFormatTokenBindingHandler binder, params object[] args)
{
return(Format(format, null, binder, args));
}