// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT license.

using System;

using System.Collections;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

namespace Microsoft.ClearScript.Util

{

internal static class EnumerableHelpers

{

public static readonly HostType HostType = HostType.Wrap(typeof(EnumerableHelpers));

public static IList<T> ToIList<T>(this IEnumerable<T> source)

{

return (source as IList<T>) ?? source.ToList();

}

public static void ForEach<T>(this IEnumerable<T> source, Action<T> action)

{

foreach (var element in source)

{

action(element);

}

}

public static void ForEach<T>(this IEnumerable<T> source, Action<T, int> action)

{

var index = 0;

foreach (var element in source)

{

action(element, index++);

}

}

public static IEnumerable<string> ExcludeIndices(this IEnumerable<string> names)

{

foreach (var name in names)

{

int index;

if (!int.TryParse(name, NumberStyles.Integer, CultureInfo.InvariantCulture, out index))

{

yield return name;

}

}

}

public static IEnumerable<int> GetIndices(this IEnumerable<string> names)

{

foreach (var name in names)

{

int index;

if (int.TryParse(name, NumberStyles.Integer, CultureInfo.InvariantCulture, out index))

{

yield return index;

}

}

}

public static IEnumerator<T> GetEnumerator<T>(IEnumerable<T> source)

{

return source.GetEnumerator();

}

public static IEnumerator GetEnumerator(IEnumerable source)

{

return source.GetEnumerator();

}

}

}