using System.Text.RegularExpressions;

namespace UnityEditor.Rendering
{
    /// <summary>
    /// Set of utility functions with <see cref="string"/>
    /// </summary>
    public static class StringExtensions
    {
        private static Regex k_InvalidRegEx = new (string.Format(@"([{0}]*\.+$)|([{0}]+)", Regex.Escape(new string(System.IO.Path.GetInvalidFileNameChars()))), RegexOptions.Compiled);

        /// <summary>
        /// Replaces invalid characters for a filename or a directory with a given optional replacemenet string
        /// </summary>
        /// <param name="input">The input filename or directory</param>
        /// <param name="replacement">The replacement</param>
        /// <returns>The string with the invalid characters replaced</returns>
        public static string ReplaceInvalidFileNameCharacters(this string input, string replacement = "_") => k_InvalidRegEx.Replace(input, replacement);
    }
}