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100 lines
3.3 KiB
100 lines
3.3 KiB
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Net3_Proxy
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{
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internal static class Utils
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{
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public static bool IsNullOrWhiteSpace(string value)
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{
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if (value == null)
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{
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return true;
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}
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for (int i = 0; i < value.Length; i++)
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{
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if (!char.IsWhiteSpace(value[i]))
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{
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return false;
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}
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}
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return true;
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}
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/// <summary>
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/// Adds a value to the beginning of the sequence.
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/// </summary>
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/// <typeparam name="T">the type of the elements of <paramref name="seq"/></typeparam>
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/// <param name="seq">a sequence of values</param>
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/// <param name="prep">the value to prepend to <paramref name="seq"/></param>
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/// <returns>a new sequence beginning with <paramref name="prep"/></returns>
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public static IEnumerable<T> Prepend<T>(this IEnumerable<T> seq, T prep)
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=> new PrependEnumerable<T>(seq, prep);
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private sealed class PrependEnumerable<T> : IEnumerable<T>
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{
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private readonly IEnumerable<T> rest;
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private readonly T first;
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public PrependEnumerable(IEnumerable<T> rest, T first)
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{
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this.rest = rest;
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this.first = first;
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}
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public IEnumerator<T> GetEnumerator() => new PrependEnumerator(this);
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private sealed class PrependEnumerator : IEnumerator<T>
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{
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private readonly IEnumerator<T> restEnum;
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private readonly PrependEnumerable<T> enumerable;
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private int state = 0;
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public PrependEnumerator(PrependEnumerable<T> enumerable)
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{
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this.enumerable = enumerable;
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restEnum = enumerable.rest.GetEnumerator();
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}
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public T Current { get; private set; }
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object IEnumerator.Current => Current;
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public void Dispose() => restEnum.Dispose();
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public bool MoveNext()
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{
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switch (state)
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{
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case 0:
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Current = enumerable.first;
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state++;
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return true;
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case 1:
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if (!restEnum.MoveNext())
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{
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state = 2;
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return false;
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}
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else
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Current = restEnum.Current;
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return true;
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case 2:
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default:
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return false;
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}
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}
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public void Reset()
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{
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restEnum.Reset();
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state = 0;
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}
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}
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
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}
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}
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}
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