using System;
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using System.Collections.Generic;
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using System.Data.SqlTypes;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace FlexJobApi.Core
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{
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/// <summary>
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/// 字符串工具
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/// </summary>
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public static class StringUtils
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{
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/// <summary>
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/// 校验字符串为空
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static bool IsNull([NotNullWhen(false)] this string str)
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{
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return string.IsNullOrWhiteSpace(str) || str == "undefined";
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}
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/// <summary>
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/// 校验字段不为空
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static bool IsNotNull([NotNullWhen(true)] this string str)
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{
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return !str.IsNull();
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}
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public static Guid? ToGuid(this string str)
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{
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if (str.IsNotNull() && Guid.TryParse(str, out var guid) && guid != Guid.Empty) return guid;
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return null;
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}
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public static int? ToInt(this string str)
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{
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if (str.IsNotNull() && int.TryParse(str, out var @int)) return @int;
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return null;
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}
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/// <summary>
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/// 获取复数英文名
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/// </summary>
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/// <param name="singularName"></param>
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/// <returns></returns>
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public static string GetPluralizedName(this string singularName)
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{
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if (singularName.EndsWith("s") || singularName.EndsWith("x") || singularName.EndsWith("z") ||
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singularName.EndsWith("ch") || singularName.EndsWith("sh"))
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{
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return singularName + "es";
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}
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else if (singularName.EndsWith("y") && !"aeiou".Contains(singularName[singularName.Length - 2]))
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{
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return singularName.Substring(0, singularName.Length - 1) + "ies";
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}
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else
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{
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return singularName + "s";
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}
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}
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}
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}
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