// Copyright © 2017-2025 QL-Win Contributors
//
// This file is part of QuickLook program.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see .
using System;
using System.Collections.Generic;
namespace QuickLook.Plugin.VideoViewer.Extensions;
internal static class StringExtension
{
///
/// Splits a ReadOnlySpan into an array of strings using the specified separator.
///
/// The input ReadOnlySpan to split.
/// The ReadOnlySpan separator to use for splitting.
/// An array of strings that are the result of splitting the input span.
///
/// - If the separator is not found, the entire input span will be returned as a single element.
/// - If the input is empty, the method will return an empty array.
/// - This method avoids allocating intermediate substrings during processing.
///
public static string[] Split(this string input, string separator)
{
if (input == null)
{
return [input];
}
ReadOnlySpan @in = input.AsSpan();
ReadOnlySpan sep = separator.AsSpan();
List result = [];
int start = 0;
// Continue splitting until no separator is found
while (true)
{
// Find the next occurrence of the separator
int index = @in.Slice(start).IndexOf(sep);
if (index == -1)
{
// No more separators; add the remaining substring
result.Add(@in.Slice(start).ToString());
break;
}
// Add the substring before the separator to the result list
result.Add(@in.Slice(start, index).ToString());
// Move the start position past the separator
start += index + sep.Length;
}
return [.. result];
}
}