public static bool TryParseAndSetFloat(this IEntropySourceConfig config, string name, ref float value)
{
var result = config.Get(name);
if (!String.IsNullOrWhiteSpace(result))
{
return(Single.TryParse(result, out value));
}
else
{
return(false);
}
}
public static bool?IsTruthy(this IEntropySourceConfig config, string name)
{
if (config == null)
{
throw new ArgumentNullException(nameof(config));
}
var result = config.Get(name);
if (String.IsNullOrWhiteSpace(result))
{
return(null); // Blank or null is absent, which means revert to a default behaviour.
}
// Falsey values are 'N', 'No', 'False', 0.
if ((result.Length == 1 && result.StartsWith("N", StringComparison.OrdinalIgnoreCase)) ||
(result.Length == 1 && result[0] == '0') ||
(result.Length > 1 && result.Equals("No", StringComparison.OrdinalIgnoreCase)) ||
(result.Length > 1 && result.Equals("False", StringComparison.OrdinalIgnoreCase))
)
{
return(false);
}
// Truthy values are 'Y', 'Yes', 'True', 1.
// PERF: this is just here do we don't try to parse everything to detect true values.
if ((result.Length == 1 && result.StartsWith("Y", StringComparison.OrdinalIgnoreCase)) ||
(result.Length == 1 && result[0] == '1') ||
(result.Length > 1 && result.Equals("Yes", StringComparison.OrdinalIgnoreCase)) ||
(result.Length > 1 && result.Equals("True", StringComparison.OrdinalIgnoreCase))
)
{
return(true);
}
// Any number which parses to 0 is considered falsy.
if (Double.TryParse(result, out double d))
{
if (d == 0 || Double.IsNaN(d))
{
return(false);
}
}
// Everything else is considered truthy.
return(true);
}