/// <summary>
/// Class contructor.
/// <see cref="ProgramOptionsBase"/> for additional information passed to ArgumentParser.
/// </summary>
/// <param name="programOptions">Instance of program options derived from ProgramOptionsBase.</param>
/// <param name="output">TextWriter to output debug messages in debug mode.</param>
internal ArgumentParser(ProgramOptionsBase programOptions, TextWriter output = null)
{
this.programOptions = programOptions;
this.output = output;
if (output == null) {
this.output = System.Console.Out;
}
}
private bool SetEnumValue(string textValue, ProgramOptionsBase options)
{
try {
var value = Enum.Parse(fieldInfo.FieldType, textValue, true);
fieldInfo.SetValue(options, value);
} catch {
return false;
}
IsPresent = true;
return true;
}
public void SetValueToDefault(ProgramOptionsBase programOptions)
{
if (optionAttribute.GetType() != typeof(OptionWithParameterAttribute))
{
throw new RequiredParameterMissingException(Name);
}
/* user has to set DefaultValue in correct type */
fieldInfo.SetValue(programOptions, ((OptionWithOptionableParameterAttribute)optionAttribute).DefaultValue);
IsPresent = true;
}
/// <summary>
///
/// </summary>
/// <param name="textValue"></param>
/// <param name="options"></param>
/// <returns></returns>
public bool SetValue(string textValue, ProgramOptionsBase options)
{
Type fieldType = fieldInfo.FieldType;
if (fieldType == typeof(string)) {
fieldInfo.SetValue(options, textValue);
} else if (fieldInfo.FieldType.IsEnum) {
return SetEnumValue(textValue, options);
} else {
object value = null;
try {
value = TypeDescriptor.GetConverter(fieldType).ConvertFromString(textValue);
} catch (NotSupportedException) {
return false;
}
if (value is IComparable)
{
BoundsCheck((IComparable)value);
}
fieldInfo.SetValue(options, value);
}
IsPresent = true;
return true;
}