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+using System.Text;
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+using BenchmarkDotNet.Attributes;
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+using Tui = Terminal.Gui;
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+
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+namespace Terminal.Gui.Benchmarks.Text.TextFormatter;
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+
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+/// <summary>
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+/// Benchmarks for <see cref="Tui.TextFormatter.RemoveHotKeySpecifier"/> performance fine-tuning.
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+/// </summary>
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+[MemoryDiagnoser]
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+[BenchmarkCategory (nameof(Tui.TextFormatter))]
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+public class RemoveHotKeySpecifier
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+{
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+ // Omit from summary table.
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+ private static readonly Rune HotkeySpecifier = (Rune)'_';
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+
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+ /// <summary>
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+ /// Benchmark for previous implementation.
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+ /// </summary>
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+ [Benchmark]
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+ [ArgumentsSource (nameof (DataSource))]
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+ public string Previous (string text, int hotPos)
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+ {
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+ return StringConcatLoop (text, hotPos, HotkeySpecifier);
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+ }
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+
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+ /// <summary>
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+ /// Benchmark for current implementation with stackalloc char buffer and fallback to rented array.
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+ /// </summary>
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+ [Benchmark (Baseline = true)]
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+ [ArgumentsSource (nameof (DataSource))]
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+ public string Current (string text, int hotPos)
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+ {
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+ return Tui.TextFormatter.RemoveHotKeySpecifier (text, hotPos, HotkeySpecifier);
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+ }
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+
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+ /// <summary>
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+ /// Previous implementation with string concatenation in a loop.
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+ /// </summary>
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+ public static string StringConcatLoop (string text, int hotPos, Rune hotKeySpecifier)
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+ {
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+ if (string.IsNullOrEmpty (text))
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+ {
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+ return text;
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+ }
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+
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+ // Scan
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+ var start = string.Empty;
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+ var i = 0;
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+
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+ foreach (Rune c in text.EnumerateRunes ())
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+ {
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+ if (c == hotKeySpecifier && i == hotPos)
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+ {
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+ i++;
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+
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+ continue;
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+ }
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+
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+ start += c;
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+ i++;
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+ }
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+
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+ return start;
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+ }
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+
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+ public IEnumerable<object []> DataSource ()
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+ {
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+ string[] texts = [
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+ "",
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+ // Typical scenario.
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+ "_Save file (Ctrl+S)",
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+ // Medium text, hotkey specifier somewhere in the middle.
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+ "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla sed euismod metus. _Phasellus lectus metus, ultricies a commodo quis, facilisis vitae nulla.",
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+ // Long text, hotkey specifier almost at the beginning.
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+ "Ĺόŕéḿ íṕśúḿ d́όĺόŕ śít́ áḿét́, ćόńśéćt́ét́úŕ ád́íṕíśćíńǵ éĺít́. _Ṕŕáéśéńt́ q́úíś ĺúćt́úś éĺít́. Íńt́éǵéŕ út́ áŕćú éǵét́ d́όĺόŕ śćéĺéŕíśq́úé ḿát́t́íś áć ét́ d́íáḿ. " +
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+ "Ṕéĺĺéńt́éśq́úé śéd́ d́áṕíb́úś ḿáśśá, v́éĺ t́ŕíśt́íq́úé d́úí. Śéd́ v́ít́áé ńéq́úé éú v́éĺít́ όŕńáŕé áĺíq́úét́. Út́ q́úíś όŕćí t́éḿṕόŕ, t́éḿṕόŕ t́úŕṕíś íd́, t́éḿṕúś ńéq́úé. " +
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+ "Ṕŕáéśéńt́ śáṕíéń t́úŕṕíś, όŕńáŕé v́éĺ ḿáúŕíś át́, v́áŕíúś śúśćíṕít́ áńt́é. Út́ ṕúĺv́íńáŕ t́úŕṕíś ḿáśśá, q́úíś ćúŕśúś áŕćú f́áúćíb́úś íń.",
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+ // Long text, hotkey specifier almost at the end.
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+ "Ĺόŕéḿ íṕśúḿ d́όĺόŕ śít́ áḿét́, ćόńśéćt́ét́úŕ ád́íṕíśćíńǵ éĺít́. Ṕŕáéśéńt́ q́úíś ĺúćt́úś éĺít́. Íńt́éǵéŕ út́ áŕćú éǵét́ d́όĺόŕ śćéĺéŕíśq́úé ḿát́t́íś áć ét́ d́íáḿ. " +
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+ "Ṕéĺĺéńt́éśq́úé śéd́ d́áṕíb́úś ḿáśśá, v́éĺ t́ŕíśt́íq́úé d́úí. Śéd́ v́ít́áé ńéq́úé éú v́éĺít́ όŕńáŕé áĺíq́úét́. Út́ q́úíś όŕćí t́éḿṕόŕ, t́éḿṕόŕ t́úŕṕíś íd́, t́éḿṕúś ńéq́úé. " +
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+ "Ṕŕáéśéńt́ śáṕíéń t́úŕṕíś, όŕńáŕé v́éĺ ḿáúŕíś át́, v́áŕíúś śúśćíṕít́ áńt́é. _Út́ ṕúĺv́íńáŕ t́úŕṕíś ḿáśśá, q́úíś ćúŕśúś áŕćú f́áúćíb́úś íń.",
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+ ];
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+
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+ foreach (string text in texts)
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+ {
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+ int hotPos = text.EnumerateRunes()
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+ .Select((r, i) => r == HotkeySpecifier ? i : -1)
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+ .FirstOrDefault(i => i > -1, -1);
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+
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+ yield return [text, hotPos];
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+ }
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+
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+ // Typical scenario but without hotkey and with misleading position.
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+ yield return ["Save file (Ctrl+S)", 3];
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+ }
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+}
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