protected virtual async Task <string> InternalTransformAsync(string template, IEnumerable <IToken> tokens, object[] additionalData, Func <IToken, Task <object> > dataProvider)
{
var builder = new StringBuilder(template);
var adjustment = 0;
foreach (var token in tokens.OrderBy(t => t.Index))
{
var val = await TryGetAndCacheValueAsync(token, dataProvider).ConfigureAwait(false) ?? TryGetAndCacheValue(token, additionalData);
if (val == null)
{
throw new UnResolvedTokenException(token.Token);
}
var strVal = _formatter.Convert(token, val);
builder = builder.Replace(token.Token, strVal, token.Index + adjustment, token.Token.Length);
adjustment += strVal.Length - token.Token.Length;
}
return(builder.ToString());
}