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49 lines
1.4 KiB
49 lines
1.4 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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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()
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{ // TODO: a custom impl that is less garbage
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yield return first;
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foreach (var v in rest) yield return v;
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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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