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62 lines
2.5 KiB
C#
62 lines
2.5 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System.Collections.Generic;
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using System.Text.RegularExpressions;
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namespace osu.Game.Utils
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{
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public static class NamingUtils
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{
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/// <summary>
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/// Given a set of <paramref name="existingNames"/> and a target <paramref name="desiredName"/>,
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/// finds a "best" name closest to <paramref name="desiredName"/> that is not in <paramref name="existingNames"/>.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This helper is most useful in scenarios when creating new objects in a set
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/// (such as adding new difficulties to a beatmap set, or creating a clone of an existing object that needs a unique name).
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/// If <paramref name="desiredName"/> is already present in <paramref name="existingNames"/>,
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/// this method will append the lowest possible number in brackets that doesn't conflict with <paramref name="existingNames"/>
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/// to <paramref name="desiredName"/> and return that.
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/// See <c>osu.Game.Tests.Utils.NamingUtilsTest</c> for concrete examples of behaviour.
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/// </para>
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/// <para>
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/// <paramref name="desiredName"/> and <paramref name="existingNames"/> are compared in a case-insensitive manner,
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/// so this method is safe to use for naming files in a platform-invariant manner.
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/// </para>
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/// </remarks>
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public static string GetNextBestName(IEnumerable<string> existingNames, string desiredName)
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{
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string pattern = $@"^(?i){Regex.Escape(desiredName)}(?-i)( \((?<copyNumber>[1-9][0-9]*)\))?$";
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var regex = new Regex(pattern, RegexOptions.Compiled);
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var takenNumbers = new HashSet<int>();
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foreach (string name in existingNames)
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{
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var match = regex.Match(name);
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if (!match.Success)
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continue;
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string copyNumberString = match.Groups[@"copyNumber"].Value;
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if (string.IsNullOrEmpty(copyNumberString))
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{
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takenNumbers.Add(0);
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continue;
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}
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takenNumbers.Add(int.Parse(copyNumberString));
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}
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int bestNumber = 0;
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while (takenNumbers.Contains(bestNumber))
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bestNumber += 1;
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return bestNumber == 0
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? desiredName
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: $"{desiredName} ({bestNumber})";
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}
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}
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}
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