IFormattingExtensionsToggle

Description

Lets a source stop formatter extensions from running for the placeholder it resolved.

SmartFormatter passes a FormattingInfo, which implements this interface, as the ISelectorInfo argument of ISource.TryEvaluateSelector. Cast that argument to IFormattingExtensionsToggle and set IFormattingExtensionsToggle.DisableFormattingExtensions to true when default formatting can't reasonably handle the value the source found. The source can then write the output itself with IFormattingInfo.Write, or write nothing.

Additional resources: ISource, FormattingInfo

using Unity.SmartStrings.Core.Extensions;

// Resolves {Password} to the real value, but writes a mask instead of formatting it.
public class MaskedSource : ISource
{
    public bool TryEvaluateSelector(ISelectorInfo selectorInfo)
    {
        if (selectorInfo.SelectorText != "Password")
            return false;

        if (selectorInfo is IFormattingExtensionsToggle toggle)
            toggle.DisableFormattingExtensions = true;

        if (selectorInfo is IFormattingInfo formattingInfo)
            formattingInfo.Write("********");

        selectorInfo.Result = selectorInfo.CurrentValue;
        return true;
    }
}

Properties