ClearScript/ClearScript/Util/EnumerableHelpers.cs at master · git-thinh/ClearScript · GitHub

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// Licensed under the MIT license.

using System;

using System.Collections;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

using System.Runtime.InteropServices.ComTypes;

using Microsoft.ClearScript.Util.COM;

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<T> ToSafeEnumerable<T>(this IEnumerable<T> source)

{

if (source != null)

{

foreach (var element in source)

{

yield return element;

}

public static IEnumerable<T> Flatten<T>(this IEnumerable<T> source, Func<T, IEnumerable<T>> selector)

{

foreach (var element in source)

{

yield return element;

foreach (var descendant in selector(element).Flatten(selector))

{

yield return descendant;

}

public static IEnumerable<T> ToEnumerable<T>(this T element)

{

yield return element;

}

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();

}

public static IEnumerator GetEnumerator(object source)

{

return ((IEnumerable)source).GetEnumerator();

}

internal sealed class EnumeratorWrapper : IEnumerator

{

private readonly IEnumVARIANT enumVariant;

public EnumeratorWrapper(IEnumVARIANT enumVariant)

{

this.enumVariant = enumVariant;

}

public bool MoveNext()

{

var items = new object[1];

if (enumVariant.Next(1, items, IntPtr.Zero) == HResult.S_OK)

{

Current = items[0];

return true;

}

return false;

}

public void Reset()

{

enumVariant.Reset();

}

public object Current { get; private set; }

}

ClearScript/ClearScript/Util/EnumerableHelpers.cs at master · git-thinh/ClearScript · GitHub

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