private static ArgumentDefinition CreateArgumentDescriptor(
IMutableMemberInfo member,
ArgumentBaseAttribute attribute,
object defaultValues,
ArgumentSetDefinition argSet,
object fixedDestination,
ArgumentDefinition containingArgument,
ServiceConfigurer serviceConfigurer)
{
if (!member.IsReadable || !member.IsWritable)
{
var declaringType = member.MemberInfo.DeclaringType;
throw new InvalidArgumentSetException(member, string.Format(
CultureInfo.CurrentCulture,
Strings.MemberNotSupported,
member.MemberInfo.Name,
declaringType?.Name));
}
var defaultFieldValue = (defaultValues != null) ? member.GetValue(defaultValues) : null;
return(new ArgumentDefinition(member,
attribute,
argSet,
defaultValue: defaultFieldValue,
fixedDestination: fixedDestination,
containingArgument: containingArgument,
serviceConfigurer: serviceConfigurer));
}
private bool TryParseAndStore(ArgumentDefinition arg, string value, object dest)
{
if (!arg.TryParseAndStore(value, dest, out object parsedValue))
{
return(false);
}
// Inspect the parsed value.
var argProvider = parsedValue as IArgumentProvider;
if (argProvider == null)
{
argProvider = (arg.FixedDestination ?? dest) as IArgumentProvider;
}
if (argProvider != null)
{
var definingType = argProvider.GetTypeDefiningArguments();
if (definingType != null)
{
_argumentSet.AddArgumentsFromTypeWithAttributes(definingType,
fixedDestination: argProvider.GetDestinationObject());
}
}
return(true);
}
/// <summary>
/// Constructs a result for cases where parser is ready.
/// </summary>
/// <param name="lastParsedArg">If non-null, indicates the last argument
/// that was parsed.</param>
/// <returns>The result object. </returns>
public static ArgumentSetParseResult Ready(ArgumentDefinition lastParsedArg)
{
return(new ArgumentSetParseResult(ArgumentSetParseResultType.Ready)
{
LastSeenArg = lastParsedArg
});
}
/// <summary>
/// Checks if this parser has seen a value provided for the given argument.
/// </summary>
/// <param name="arg">The argument to look for.</param>
/// <returns>True if a value has been seen; false otherwise.</returns>
public bool HasSeenValueFor(ArgumentDefinition arg)
{
if (!_stateByArg.TryGetValue(arg, out ArgumentParser parser))
{
return(false);
}
return(parser.SeenValue);
}
/// <summary>
/// Registers an Argument that conflicts with the one described by this
/// object. If the specified argument has already previously been
/// registered, then this operation is a no-op.
/// </summary>
/// <param name="arg">The conflicting argument.</param>
public void AddConflictingArgument(ArgumentDefinition arg)
{
if (arg == this)
{
throw new ArgumentOutOfRangeException(nameof(arg));
}
_conflictingArgs.Add(arg);
}
public ArgumentDefinition(MemberInfo member,
ArgumentBaseAttribute attribute,
ArgumentSetDefinition argSet,
object defaultValue = null,
ArgumentDefinition containingArgument = null,
ServiceConfigurer serviceConfigurer = null)
: this(GetMutableMemberInfo(member), attribute, argSet, defaultValue, /*fixedDestination=*/ null, containingArgument, serviceConfigurer)
{
}
/// <summary>
/// Constructs a result for cases where parser is next looking to see an argument
/// to an option.
/// </summary>
/// <param name="arg">Argument that requires option argument.</param>
/// <returns>The constructed result object.</returns>
public static ArgumentSetParseResult RequiresOptionArgument(ArgumentDefinition arg)
{
if (arg == null)
{
throw new ArgumentNullException(nameof(arg));
}
return(new ArgumentSetParseResult(ArgumentSetParseResultType.RequiresOptionArgument)
{
LastSeenArg = arg
});
}
public static TokenParseResult RequiresOptionArgument(ArgumentDefinition arg)
{
if (arg == null)
{
throw new ArgumentNullException(nameof(arg));
}
return(new TokenParseResult(TokenParseResultState.RequiresOptionArgument)
{
Argument = arg
});
}
/// <summary>
/// Constructor that forms the info from the argument's metadata.
/// </summary>
/// <param name="arg">Argument metadata.</param>
/// <param name="currentValue">Current value.</param>
public ArgumentUsageInfo(ArgumentDefinition arg, object currentValue = null) : this(
syntax : arg.GetSyntaxSummary(detailed : false),
detailedSyntax : arg.GetSyntaxSummary(detailed : true),
description : arg.Attribute.Description,
required : arg.IsRequired,
shortName : arg.ShortName,
defaultValue : TryGetDefaultValueString(arg, onlyReturnExplicitDefaults : true),
argType : arg.ArgumentType,
currentValue : currentValue)
{
}
/// <summary>
/// Tries to find the argument's default value.
/// </summary>
/// <param name="arg">The argument to retrieve a default value from.</param>
/// <param name="onlyReturnExplicitDefaults">True to only return
/// a default if it was explicitly specified; false to report on
/// the default, even if it was defaulted itself.</param>
/// <param name="value">On success, receives the default value
/// for this argument; otherwise, receives null.</param>
/// <returns>True on success, false otherwise.</returns>
public static bool TryGetDefaultValue(ArgumentDefinition arg, bool onlyReturnExplicitDefaults, out object value)
{
// Firstly, if the argument is required, then there's no need to
// indicate any default value.
if (arg.IsRequired)
{
value = null;
return(false);
}
// Next, go check for the actual *effective* default value for the
// argument; we may still receive back a value here even if one
// wasn't explicitly declared, as we will have consulted with the
// argument's type to determine its default value.
if (onlyReturnExplicitDefaults && !arg.HasDefaultValue)
{
value = null;
return(false);
}
// If the default value is null, then that's not useful to show the
// user.
var defaultValue = arg.EffectiveDefaultValue;
if (defaultValue == null)
{
value = null;
return(false);
}
// Special case: if the argument type is bool, then the argument
// will be like a switch, and that's typically assumed to be false
// if not present. So if the default value is indeed 'false', then
// don't bother displaying it; but if it's 'true', then it's
// important to indicate that.
if ((defaultValue is bool) && !((bool)defaultValue))
{
value = null;
return(false);
}
// Special case: if the argument type is string, then it's safe
// to assume that its default value is an empty string.
if ((defaultValue is string stringDefaultValue) &&
string.IsNullOrEmpty(stringDefaultValue))
{
value = null;
return(false);
}
// Okay, we have the value.
value = defaultValue;
return(true);
}
/// <summary>
/// Internal constructor.
/// </summary>
/// <param name="member">Field to describe.</param>
/// <param name="attribute">Argument attribute on the field.</param>
/// <param name="argSet">Argument set containing this argument.</param>
/// <param name="defaultValue">Default value for the field.</param>
/// <param name="fixedDestination">Optionally provides fixed parse destination object.</param>
/// <param name="containingArgument">Optionally provides a reference
/// to the definition of the argument that "contains" these arguments.
/// </param>
/// <param name="serviceConfigurer">Optionally provides a service configurer.</param>
internal ArgumentDefinition(IMutableMemberInfo member,
ArgumentBaseAttribute attribute,
ArgumentSetDefinition argSet,
object defaultValue = null,
object fixedDestination = null,
ArgumentDefinition containingArgument = null,
ServiceConfigurer serviceConfigurer = null)
{
Member = member ?? throw new ArgumentNullException(nameof(member));
Attribute = attribute ?? throw new ArgumentNullException(nameof(attribute));
ContainingSet = argSet ?? throw new ArgumentNullException(nameof(argSet));
ContainingArgument = containingArgument;
FixedDestination = fixedDestination;
IsPositional = attribute is PositionalArgumentAttribute;
ArgumentType = GetArgumentType(Attribute, member, member.MemberType, serviceConfigurer);
CollectionArgumentType = AsCollectionType(ArgumentType);
HasDefaultValue = attribute.ExplicitDefaultValue || attribute.DynamicDefaultValue;
ValidationAttributes = GetValidationAttributes(ArgumentType, Member);
LongName = GetLongName(attribute, argSet.Attribute, member.MemberInfo);
ExplicitShortName = HasExplicitShortName(attribute);
ShortName = GetShortNameOrNull(attribute, argSet.Attribute, member.MemberInfo);
DefaultValue = GetDefaultValue(attribute, member, defaultValue);
var nullableBase = Nullable.GetUnderlyingType(member.MemberType);
if (CollectionArgumentType != null)
{
ValueType = CollectionArgumentType.ElementType;
}
else if (nullableBase != null)
{
// For nullable arguments, we use the wrapped type (T in
// Nullable<T>) as the value type. Parsing an enum or int is the
// same as parsing an enum? or int?, for example, since null can
// only arise if the value was not provided at all.
ValueType = GetArgumentType(Attribute, member, nullableBase, serviceConfigurer);
}
else
{
ValueType = ArgumentType;
}
Debug.Assert(ValueType != null);
if (Unique && !IsCollection)
{
throw new InvalidArgumentSetException(member, Strings.UniqueUsedOnNonCollectionArgument);
}
Debug.Assert(!string.IsNullOrEmpty(LongName));
}
/// <summary>
/// Constructs a new stateful parser for the given argument.
/// </summary>
/// <param name="argSet">The argument set containing the argument to be parsed.</param>
/// <param name="arg">The definition of the argument.</param>
/// <param name="options">General options for parsing this argument set.</param>
/// <param name="destination">The destination object into which the parsed result should go,
/// if so desired; null otherwise to parse without saving results.</param>
public ArgumentParser(ArgumentSetDefinition argSet, ArgumentDefinition arg, CommandLineParserOptions options,
object destination = null)
{
ArgumentSet = argSet ?? throw new ArgumentNullException(nameof(argSet));
Argument = arg ?? throw new ArgumentNullException(nameof(arg));
Reporter = options?.Reporter ?? (s => { });
DestinationObject = arg.FixedDestination ?? destination;
ParseContext = CreateParseContext(Argument, ArgumentSet.Attribute, options, DestinationObject);
if (Argument.IsCollection)
{
CollectionValues = GenericCollectionFactory.CreateList(Argument.CollectionArgumentType.ElementType.Type);
}
}
/// <summary>
/// Tries to construct a string describing the argument's default value.
/// </summary>
/// <param name="arg">The argument to retrieve a default value string
/// from.</param>
/// <param name="onlyReturnExplicitDefaults">True to only return
/// a default if it was explicitly specified; false to report on
/// the default, even if it was defaulted itself.</param>
/// <returns>If one should be advertised, returns the string version of
/// the default value for this argument; otherwise, returns null.
/// </returns>
public static string TryGetDefaultValueString(ArgumentDefinition arg, bool onlyReturnExplicitDefaults = false)
{
// Try to get the default value.
if (!TryGetDefaultValue(arg, onlyReturnExplicitDefaults, out object defaultValue))
{
return(null);
}
// Now turn the value into a string.
var formattedArg = arg.Format(defaultValue, suppressArgNames: true).ToList();
if (formattedArg.Count == 0)
{
return(null);
}
return(string.Join(" ", formattedArg));
}
private void AddPositionalArgument(ArgumentDefinition arg, int positionalIndexBias)
{
var attrib = (PositionalArgumentAttribute)arg.Attribute;
var position = positionalIndexBias + attrib.Position;
if (_positionalArguments.ContainsKey(position))
{
throw new InvalidArgumentSetException(arg, string.Format(
CultureInfo.CurrentCulture,
Strings.DuplicatePositionArguments,
_positionalArguments[position].Member.MemberInfo.Name,
arg.Member.MemberInfo.Name,
position));
}
_positionalArguments.Add(position, arg);
_nextPositionalArgIndexToDefine = position + 1;
}
/// <summary>
/// Retrieves the parse state for the given argument. If no such state exists,
/// then a state object is constructed and persisted.
/// </summary>
/// <param name="arg">The argument to look up.</param>
/// <param name="destination">Optionally provides the destination object
/// being parsed into.</param>
/// <returns>The parse state for the given argument.</returns>
private ArgumentParser GetStateForArgument(ArgumentDefinition arg, object destination)
{
ArgumentParser parser;
if (_stateByArg.ContainsKey(arg))
{
parser = _stateByArg[arg];
if (destination != null &&
parser.Argument.FixedDestination == null &&
parser.DestinationObject != destination)
{
throw new InvalidOperationException();
}
}
else
{
parser = _stateByArg[arg] = new ArgumentParser(ArgumentSet, arg, _options, destination);
}
return(parser);
}
public static void AddToArgumentSet(
ArgumentSetDefinition argSet,
Type typeToReflectOn,
object defaultValues = null,
object fixedDestination = null,
ArgumentDefinition containingArgument = null,
ServiceConfigurer serviceConfigurer = null)
{
// Extract argument descriptors from the defining type.
var args = GetArgumentDescriptors(
typeToReflectOn,
argSet,
defaultValues,
fixedDestination,
containingArgument,
serviceConfigurer).ToList();
// Define the arguments.
argSet.Add(args);
// If the provided type we're reflecting on has an ArgumentSetAttribute,
// then add that as auxiliary information.
var auxiliaryAttrib = TryGetSetAttribute(typeToReflectOn);
if (auxiliaryAttrib != null)
{
argSet.AddAuxiliaryAttribute(auxiliaryAttrib);
}
// If the argument set doesn't already have a default assembly associated
// with it, then fill that out.
if (argSet.DefaultAssembly == null)
{
argSet.DefaultAssembly = typeToReflectOn.GetTypeInfo().Assembly;
}
}
/// <summary> /// Try to look up a positional argument by position. /// </summary> /// <param name="position">0-based position index to look up.</param> /// <param name="arg">On success, receives the argument.</param> /// <returns>True on success; false otherwise.</returns> public bool TryGetPositionalArgument(int position, out ArgumentDefinition arg) => _positionalArguments.TryGetValue(position, out arg);
/// <summary>
/// Try to look up a named argument by short or long name.
/// </summary>
/// <param name="nameType">Type of name to look up.</param>
/// <param name="name">Name to look up.</param>
/// <param name="arg">On success, receives the named argument.</param>
/// <returns>True on success; false otherwise.</returns>
public bool TryGetNamedArgument(ArgumentNameType nameType, string name, out ArgumentDefinition arg)
{
var dict = GetNamedArgumentDictionary(nameType);
return(dict.TryGetValue(name, out arg));
}
/// <summary>
/// Adds an argument.
/// </summary>
/// <param name="arg">Argument to define.</param>
public void AddArgument(ArgumentDefinition arg) => Add(new[] { arg });
private void AddNamedArgument(ArgumentDefinition argument)
{
//
// Validate and register the long name.
//
if (_namedArgumentsByName.ContainsKey(argument.LongName))
{
throw new InvalidArgumentSetException(argument, string.Format(
CultureInfo.CurrentCulture,
Strings.DuplicateArgumentLongName,
argument.LongName));
}
_namedArgumentsByName.Add(argument.LongName, argument);
//
// Validate and register the short name.
//
if (!string.IsNullOrEmpty(argument.ShortName))
{
if (_namedArgumentsByName.TryGetValue(argument.ShortName, out ArgumentDefinition conflictingArg))
{
Debug.Assert(conflictingArg != null);
if (argument.ExplicitShortName)
{
if (conflictingArg.ExplicitShortName)
{
throw new InvalidArgumentSetException(argument, string.Format(CultureInfo.CurrentCulture,
Strings.DuplicateArgumentShortName,
argument.ShortName));
}
else
{
// TODO: Decide whether this works for dynamically imported args.
_namedArgumentsByName.Remove(conflictingArg.ShortName);
conflictingArg.ClearShortName();
}
}
else
{
argument.ClearShortName();
}
}
}
if (!string.IsNullOrEmpty(argument.ShortName))
{
if (Attribute.AllowMultipleShortNamesInOneToken &&
argument.ShortName.Length > 1)
{
throw new InvalidArgumentSetException(argument, string.Format(CultureInfo.CurrentCulture,
Strings.ArgumentShortNameTooLong,
argument.ShortName));
}
_namedArgumentsByName.Add(argument.ShortName, argument);
}
// Add to unique list.
_namedArguments.Add(argument);
}
private static IEnumerable <ArgumentDefinition> CreateArgumentDescriptorsIfApplicable(IMutableMemberInfo member, object defaultValues,
ArgumentSetDefinition argSet, object fixedDestination, ArgumentDefinition containingArgument, ServiceConfigurer serviceConfigurer)
{
var descriptors = Enumerable.Empty <ArgumentDefinition>();
var argAttrib = member.MemberInfo.GetSingleAttribute <ArgumentBaseAttribute>();
if (argAttrib != null)
{
descriptors = descriptors.Concat(
new[]
{
CreateArgumentDescriptor(
member,
argAttrib,
defaultValues,
argSet,
fixedDestination,
containingArgument,
serviceConfigurer)
});
}
return(descriptors);
}
private static IEnumerable <ArgumentDefinition> GetArgumentDescriptors(Type type, ArgumentSetDefinition argSet, object defaultValues, object fixedDestination, ArgumentDefinition containingArgument, ServiceConfigurer serviceConfigurer)
{
// Find all fields and properties that have argument attributes on
// them. For each that we find, capture information about them.
var argList = GetAllFieldsAndProperties(type, includeNonPublicMembers: true)
.SelectMany(member => CreateArgumentDescriptorsIfApplicable(member, defaultValues, argSet, fixedDestination, containingArgument, serviceConfigurer));
// If the argument set attribute indicates that we should also
// include un-attributed, public, writable members as named
// arguments, then look for them now.
if (argSet.Attribute.PublicMembersAreNamedArguments)
{
argList = argList.Concat(GetAllFieldsAndProperties(type, includeNonPublicMembers: false)
.Where(member => member.IsWritable)
.Where(member => member.MemberInfo.GetSingleAttribute <ArgumentBaseAttribute>() == null)
.Select(member => CreateArgumentDescriptor(
member,
new NamedArgumentAttribute(),
defaultValues,
argSet,
fixedDestination,
containingArgument,
serviceConfigurer)));
}
return(argList);
}
/// <summary> /// Try to look up a named argument by name (short name or long name). /// </summary> /// <param name="name">Name to look up.</param> /// <param name="arg">On success, receives the named argument.</param> /// <returns>True on success; false otherwise.</returns> public bool TryGetNamedArgument(string name, out ArgumentDefinition arg) => _namedArgumentsByName.TryGetValue(name, out arg);
