public static IEnumerable <OptionSource> Get <TOptions>() where TOptions : new()
{
var defaultOptions = new TOptions();
return(typeof(TOptions).GetProperties()
.Select(property => OptionSource.Typed("<DEFAULT>", property.Name, property.GetValue(defaultOptions, null))));
}
public static IEnumerable <OptionSource> FromFile(string fileName, string sectionName = null)
{
var options = new List <OptionSource>();
if (!File.Exists(fileName))
{
throw new FileNotFoundException(fileName);
}
var yamlStream = new YamlStream();
var reader = new StringReader(File.ReadAllText(fileName));
try {
yamlStream.Load(reader);
} catch (Exception ex) {
throw new OptionException(
String.Format("An invalid configuration file has been specified. {0}{1}", Environment.NewLine,
ex.Message), "config");
}
var yamlNode = (YamlMappingNode)yamlStream.Documents[0].RootNode;
if (!String.IsNullOrEmpty(sectionName))
{
Func <KeyValuePair <YamlNode, YamlNode>, bool> predicate = x =>
x.Key.ToString() == sectionName && x.Value.GetType() == typeof(YamlMappingNode);
var nodeExists = yamlNode.Children.Any(predicate);
if (nodeExists)
{
yamlNode = (YamlMappingNode)yamlNode.Children.First(predicate).Value;
}
}
foreach (var yamlElement in yamlNode.Children)
{
var yamlScalarNode = yamlElement.Value as YamlScalarNode;
var yamlSequenceNode = yamlElement.Value as YamlSequenceNode;
var yamlMappingNode = yamlElement.Value as YamlMappingNode;
if (yamlSequenceNode != null)
{
var values = yamlSequenceNode.Children.Select(x => ((YamlScalarNode)x).Value);
try {
//TODO GFY DO WE PREFER STRINGS OR TYPES HERE?
options.Add(OptionSource.String("Config File", yamlElement.Key.ToString(), values.ToArray()));
} catch (InvalidCastException) {
var message = String.Format("Please ensure that {0} is a valid YAML array.{1}", yamlElement.Key,
Environment.NewLine);
throw new OptionException(message, yamlElement.Key.ToString());
}
}
else if (yamlScalarNode != null)
{
options.Add(OptionSource.String("Config File", yamlElement.Key.ToString(),
yamlElement.Value.ToString()));
}
else if (yamlMappingNode != null && !string.IsNullOrEmpty(sectionName))
{
options.Add(OptionSource.Typed("Config File", yamlElement.Key.ToString(),
yamlMappingNode.ToDictionary(x => x.Key.ToString(), x => x.Value.ToString())));
}
}
return(options);
}