// Copyright 2009-2022 Josh Close
// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
// https://github.com/JoshClose/CsvHelper
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace CsvHelper
{
	/// <summary>
	/// Methods to help with arrays.
	/// </summary>
	public static class ArrayHelper
    {
		/// <summary>
		/// Trims the characters off the start and end of the buffer
		/// by updating the start and length arguments.
		/// </summary>
		/// <param name="buffer">The buffer.</param>
		/// <param name="start">The start.</param>
		/// <param name="length">The length.</param>
		/// <param name="trimChars">The characters to trim.</param>
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void Trim(char[] buffer, ref int start, ref int length, char[] trimChars)
		{
			// Trim start.
			for (var i = start; i < start + length; i++)
			{
				var c = buffer[i];
				if (!Contains(trimChars, c))
				{
					break;
				}

				start++;
				length--;
			}

			// Trim end.
			for (var i = start + length - 1; i > start; i--)
			{
				var c = buffer[i];
				if (!Contains(trimChars, c))
				{
					break;
				}

				length--;
			}
		}

		/// <summary>
		/// Determines whether this given array contains the given character.
		/// </summary>
		/// <param name="array">The array to search.</param>
		/// <param name="c">The character to look for.</param>
		/// <returns>
		///   <c>true</c> if the array contains the characters, otherwise <c>false</c>.
		/// </returns>
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static bool Contains(char[] array, in char c)
		{
			for (var i = 0; i < array.Length; i++)
			{
				if (array[i] == c)
				{
					return true;
				}
			}

			return false;
		}
	}
}