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using System;
namespace NLangDetect.Core.Extensions
{
public static class StringExtensions
{
/// <summary>
/// Returns a new character sequence that is a subsequence of this sequence. The subsequence starts with the character at the specified index and ends with the character at index end - 1. The length of the returned sequence is end - start, so if start == end then an empty sequence is returned.
/// </summary>
/// <param name="s"></param>
/// <param name="start">the start index, inclusive</param>
/// <param name="end">the end index, exclusive</param>
/// <returns>the specified subsequence</returns>
/// <exception cref="IndexOutOfRangeException"> if start or end are negative, if end is greater than length(), or if start is greater than end</exception>
public static string SubSequence(this string s, int start, int end)
{
if (start < 0) throw new ArgumentOutOfRangeException("start", "Argument must not be negative.");
if (end < 0) throw new ArgumentOutOfRangeException("end", "Argument must not be negative.");
if (end > s.Length) throw new ArgumentOutOfRangeException("end", "Argument must not be greater than the input string's length.");
if (start > end) throw new ArgumentOutOfRangeException("start", "Argument must not be greater than the 'end' argument.");
return s.Substring(start, end - start);
}
}
}
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