v2rayN/v2rayN/ServiceLib/Common/StringEx.cs

using System.Diagnostics.CodeAnalysis;

namespace ServiceLib.Common;

public static class StringEx
{
    public static bool IsNullOrEmpty([NotNullWhen(false)] this string? value)
    {
        return string.IsNullOrEmpty(value) || string.IsNullOrWhiteSpace(value);
    }

    public static bool IsNullOrWhiteSpace([NotNullWhen(false)] this string? value)
    {
        return string.IsNullOrWhiteSpace(value);
    }

    public static bool IsNotEmpty([NotNullWhen(false)] this string? value)
    {
        return !string.IsNullOrEmpty(value);
    }

    public static bool BeginWithAny(this string s, IEnumerable<char> chars)
    {
        if (s.IsNullOrEmpty())
        {
            return false;
        }
        return chars.Contains(s.First());
    }

    private static bool IsWhiteSpace(this string value)
    {
        return value.All(char.IsWhiteSpace);
    }

    public static IEnumerable<string> NonWhiteSpaceLines(this TextReader reader)
    {
        while (reader.ReadLine() is { } line)
        {
            if (line.IsWhiteSpace())
            {
                continue;
            }
            yield return line;
        }
    }

    public static string TrimEx(this string? value)
    {
        return value == null ? string.Empty : value.Trim();
    }

    public static string RemovePrefix(this string value, char prefix)
    {
        return value.StartsWith(prefix) ? value[1..] : value;
    }

    public static string RemovePrefix(this string value, string prefix)
    {
        return value.StartsWith(prefix) ? value[prefix.Length..] : value;
    }

    public static string UpperFirstChar(this string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            return string.Empty;
        }

        return char.ToUpper(value.First()) + value[1..];
    }

    public static string AppendQuotes(this string value)
    {
        return string.IsNullOrEmpty(value) ? string.Empty : $"\"{value}\"";
    }

    public static int ToInt(this string? value, int defaultValue = 0)
    {
        return int.TryParse(value, out var result) ? result : defaultValue;
    }
}