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// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
// This was copied from https://github.com/dotnet/runtime/blob/39b9607807f29e48cae4652cd74735182b31182e/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/NullableAttributes.cs
// and updated to have the scope of the attributes be internal.
namespace System.Diagnostics.CodeAnalysis
{
#if !NET
/// <summary>Specifies that null is allowed as an input even if the corresponding type disallows it.</summary>
[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property, Inherited = false)]
internal sealed class AllowNullAttribute : Attribute { }
/// <summary>Specifies that null is disallowed as an input even if the corresponding type allows it.</summary>
[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property, Inherited = false)]
internal sealed class DisallowNullAttribute : Attribute { }
/// <summary>Specifies that an output may be null even if the corresponding type disallows it.</summary>
[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, Inherited = false)]
internal sealed class MaybeNullAttribute : Attribute { }
/// <summary>Specifies that an output will not be null even if the corresponding type allows it.</summary>
[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, Inherited = false)]
internal sealed class NotNullAttribute : Attribute { }
/// <summary>Specifies that when a method returns <see cref="ReturnValue"/>, the parameter may be null even if the corresponding type disallows it.</summary>
[AttributeUsage (AttributeTargets.Parameter, Inherited = false)]
internal sealed class MaybeNullWhenAttribute : Attribute
{
/// <summary>Initializes the attribute with the specified return value condition.</summary>
/// <param name="returnValue">
/// The return value condition. If the method returns this value, the associated parameter may be null.
/// </param>
public MaybeNullWhenAttribute (bool returnValue) => ReturnValue = returnValue;
/// <summary>Gets the return value condition.</summary>
public bool ReturnValue { get; }
}
/// <summary>Specifies that when a method returns <see cref="ReturnValue"/>, the parameter will not be null even if the corresponding type allows it.</summary>
[AttributeUsage (AttributeTargets.Parameter, Inherited = false)]
internal sealed class NotNullWhenAttribute : Attribute
{
/// <summary>Initializes the attribute with the specified return value condition.</summary>
/// <param name="returnValue">
/// The return value condition. If the method returns this value, the associated parameter will not be null.
/// </param>
public NotNullWhenAttribute (bool returnValue) => ReturnValue = returnValue;
/// <summary>Gets the return value condition.</summary>
public bool ReturnValue { get; }
}
/// <summary>Specifies that the output will be non-null if the named parameter is non-null.</summary>
[AttributeUsage (AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, AllowMultiple = true, Inherited = false)]
internal sealed class NotNullIfNotNullAttribute : Attribute
{
/// <summary>Initializes the attribute with the associated parameter name.</summary>
/// <param name="parameterName">
/// The associated parameter name. The output will be non-null if the argument to the parameter specified is non-null.
/// </param>
public NotNullIfNotNullAttribute (string parameterName) => ParameterName = parameterName;
/// <summary>Gets the associated parameter name.</summary>
public string ParameterName { get; }
}
/// <summary>Applied to a method that will never return under any circumstance.</summary>
[AttributeUsage (AttributeTargets.Method, Inherited = false)]
internal sealed class DoesNotReturnAttribute : Attribute { }
/// <summary>Specifies that the method will not return if the associated Boolean parameter is passed the specified value.</summary>
[AttributeUsage (AttributeTargets.Parameter, Inherited = false)]
internal sealed class DoesNotReturnIfAttribute : Attribute
{
/// <summary>Initializes the attribute with the specified parameter value.</summary>
/// <param name="parameterValue">
/// The condition parameter value. Code after the method will be considered unreachable by diagnostics if the argument to
/// the associated parameter matches this value.
/// </param>
public DoesNotReturnIfAttribute (bool parameterValue) => ParameterValue = parameterValue;
/// <summary>Gets the condition parameter value.</summary>
public bool ParameterValue { get; }
}
#endif
#if !NET
/// <summary>Specifies that the method or property will ensure that the listed field and property members have not-null values.</summary>
[AttributeUsage (AttributeTargets.Method | AttributeTargets.Property, Inherited = false, AllowMultiple = true)]
internal sealed class MemberNotNullAttribute : Attribute
{
/// <summary>Initializes the attribute with a field or property member.</summary>
/// <param name="member">
/// The field or property member that is promised to be not-null.
/// </param>
public MemberNotNullAttribute (string member) => Members = new[] { member };
/// <summary>Initializes the attribute with the list of field and property members.</summary>
/// <param name="members">
/// The list of field and property members that are promised to be not-null.
/// </param>
public MemberNotNullAttribute (params string[] members) => Members = members;
/// <summary>Gets field or property member names.</summary>
public string[] Members { get; }
}
/// <summary>Specifies that the method or property will ensure that the listed field and property members have not-null values when returning with the specified return value condition.</summary>
[AttributeUsage (AttributeTargets.Method | AttributeTargets.Property, Inherited = false, AllowMultiple = true)]
internal sealed class MemberNotNullWhenAttribute : Attribute
{
/// <summary>Initializes the attribute with the specified return value condition and a field or property member.</summary>
/// <param name="returnValue">
/// The return value condition. If the method returns this value, the associated parameter will not be null.
/// </param>
/// <param name="member">
/// The field or property member that is promised to be not-null.
/// </param>
public MemberNotNullWhenAttribute (bool returnValue, string member)
{
ReturnValue = returnValue;
Members = new[] { member };
}
/// <summary>Initializes the attribute with the specified return value condition and list of field and property members.</summary>
/// <param name="returnValue">
/// The return value condition. If the method returns this value, the associated parameter will not be null.
/// </param>
/// <param name="members">
/// The list of field and property members that are promised to be not-null.
/// </param>
public MemberNotNullWhenAttribute (bool returnValue, params string[] members)
{
ReturnValue = returnValue;
Members = members;
}
/// <summary>Gets the return value condition.</summary>
public bool ReturnValue { get; }
/// <summary>Gets field or property member names.</summary>
public string[] Members { get; }
}
#endif
}
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