// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

using System;
using System.Diagnostics;

namespace Microsoft.CodeAnalysis
{
    internal static class ReflectionTypeExtensions
    {
        // Replaces a missing 4.5 method.
        internal static Type GetTypeInfo(this Type type)
        {
            return type;
        }
    }

    /// <summary>
    /// Required by <see cref="SymbolDisplayPartKind"/>.
    /// </summary>
    internal static class IErrorTypeSymbol
    {
    }

    /// <summary>
    /// Required by <see cref="Microsoft.CodeAnalysis.FailFast"/>
    /// </summary>
    internal static class Environment
    {
        public static void FailFast(string message)
        {
            System.Environment.FailFast(message);
        }

        public static void FailFast(string message, Exception exception)
        {
            System.Environment.FailFast(exception.ToString());
        }

        public static string NewLine { get { return System.Environment.NewLine; } }
    }
}

namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = false)]
    // To allow this dll to use extension methods even though we are targeting CLR v2, re-define ExtensionAttribute
    internal class ExtensionAttribute : Attribute
    {
    }

    /// <summary>
    /// This satisfies a cref on <see cref="Microsoft.CodeAnalysis.ExpressionEvaluator.DynamicFlagsCustomTypeInfo.CopyTo"/>.
    /// </summary>
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.ReturnValue)]
    internal class DynamicAttribute : Attribute
    {
    }

    /// <summary>
    /// This satisfies a cref on <see cref="Microsoft.CodeAnalysis.WellKnownMemberNames"/>.
    /// </summary>
    internal interface INotifyCompletion
    {
        void OnCompleted();
    }
}

namespace System.Text
{
    internal static class StringBuilderExtensions
    {
        public static void Clear(this StringBuilder builder)
        {
            builder.Length = 0; // Matches the real definition.
        }
    }
}