/// <summary>
/// Create a new instance of a command.
/// </summary>
/// <param name="commandInput">The <see cref="CommandInput" /> containing the details of the command to instantiate.</param>
public ICommand Create(CommandInput commandInput)
{
if (commandInput == null)
{
throw new ArgumentNullException(nameof(commandInput));
}
var descriptor = _commandRegistry.Resolve(commandInput.CommandName);
if (descriptor == null)
{
return(null);
}
var type = descriptor.ImplementingType;
var constructor = type.GetConstructors().FirstOrDefault();
var parameters = constructor?.GetParameters();
object commandInstance = null;
if (constructor == null || !parameters.Any())
{
commandInstance = Activator.CreateInstance(type);
}
else
{
var parameterValues = ResolveParameters(parameters);
commandInstance = Activator.CreateInstance(type, parameterValues);
}
return(commandInstance as ICommand);
}
private bool DetailCommand(StringBuilder output)
{
var command = _commandRegistry.Resolve(CommandName);
if (command == null)
{
return(false);
}
output.Append(_phraseDictionary.GetPhrase(Texts.PhraseKeys.Usage, _executionCultureName));
output.Append(": ");
output.Append(command.CommandName);
foreach (var numberedParameter in command.NumberedParameters)
{
output.Append(" ");
AppendParameterUsage(numberedParameter.PlaceholderText, numberedParameter.Required, output);
}
foreach (var namedParameter in command.NamedParameters)
{
output.Append(" ");
AppendNamedParameterUsage(namedParameter.Value.Name, namedParameter.Value.ValuePlaceholderText, namedParameter.Value.Required, output);
}
foreach (var flagParameter in command.FlagParameters)
{
output.Append(" ");
AppendParameterUsage($"-{flagParameter.Name}", false, output);
}
output.Append(Environment.NewLine);
output.AppendLine(command.GetDescription(_executionCultureName));
output.Append(Environment.NewLine);
foreach (var numberedParameter in command.NumberedParameters)
{
var description = numberedParameter.GetDescription(_executionCultureName);
AppendParameterDetail(numberedParameter.PlaceholderText, description, numberedParameter.Required, _executionCultureName, output);
}
foreach (var namedParameter in command.NamedParameters)
{
var description = namedParameter.Value.GetDescription(_executionCultureName);
var segment = $"-{namedParameter.Value.Name} <{namedParameter.Value.ValuePlaceholderText}>";
AppendParameterDetail(segment, description, namedParameter.Value.Required, _executionCultureName, output);
}
foreach (var flagParameter in command.FlagParameters)
{
var description = flagParameter.GetDescription(_executionCultureName);
AppendParameterDetail($"-{flagParameter.Name}", description, false, _executionCultureName, output);
}
return(true);
}
public ParameterBindResult Bind(ICommand instance, CommandInput input)
{
if (instance == null)
{
throw new ArgumentNullException(nameof(instance));
}
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
var result = new ParameterBindResult();
var descriptor = _commandRegistry.Resolve(input.CommandName);
if (descriptor == null)
{
throw new InvalidOperationException(string.Format(Texts.DescriptorForCommandCouldNotBeResolved, input.CommandName));
}
var parameters = new List <CommandParameter>(input.Parameters);
BindFlagParameters(instance, descriptor, parameters, result);
BindNamedParameters(instance, descriptor, parameters, result);
AssertNoNamedOrFlagParameters(parameters, result);
BindNumberedParameters(instance, descriptor, parameters, result);
// Anything left over was unexpected
foreach (var parameter in parameters)
{
result.AddError(string.Format(Texts.UnexpectedNumberedParameter, parameter));
}
return(result);
}
