/// <summary>
/// Try to get a suitable formatter.
/// </summary>
/// <param name="formattingInfo"></param>
/// <exception cref="FormattingException"></exception>
private void EvaluateFormatters(FormattingInfo formattingInfo)
{
var handled = InvokeFormatterExtensions(formattingInfo);
if (!handled)
{
throw formattingInfo.FormattingException("No suitable Formatter could be found", formattingInfo.Format);
}
}
private void EvaluateSelectors(FormattingInfo formattingInfo)
{
if (formattingInfo.Placeholder is null)
{
return;
}
var firstSelector = true;
foreach (var selector in formattingInfo.Placeholder.Selectors)
{
formattingInfo.Selector = selector;
formattingInfo.Result = null;
var handled = InvokeSourceExtensions(formattingInfo);
if (handled)
{
formattingInfo.CurrentValue = formattingInfo.Result;
}
if (firstSelector)
{
firstSelector = false;
// Handle "nested scopes" by traversing the stack:
var parentFormattingInfo = formattingInfo;
while (!handled && parentFormattingInfo.Parent != null)
{
parentFormattingInfo = parentFormattingInfo.Parent;
parentFormattingInfo.Selector = selector;
parentFormattingInfo.Result = null;
handled = InvokeSourceExtensions(parentFormattingInfo);
if (handled)
{
formattingInfo.CurrentValue = parentFormattingInfo.Result;
}
}
}
if (!handled)
{
throw formattingInfo.FormattingException($"Could not evaluate the selector \"{selector.RawText}\"",
selector);
}
}
}
