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Rewrite StringExtensions.ToString(IEnumerable<Rune>)

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Appends rune chars to StringBuilder avoiding intermediate string allocation for each rune append.
This commit is contained in:
Tonttu
2025-03-15 12:19:30 +02:00
committed by Tig
parent aeffe3e36e
commit b6a5ca1d4e
3 changed files with 78 additions and 6 deletions
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12
Terminal.Gui/Text/StringExtensions.cs
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@@ -124,14 +124,16 @@ public static class StringExtensions
/// <returns></returns>
public static string ToString (IEnumerable<Rune> runes)
{
var str = string.Empty;
StringBuilder stringBuilder = new();
const int maxCharsPerRune = 2;
Span<char> charBuffer = stackalloc char[maxCharsPerRune];
foreach (Rune rune in runes)
{
str += rune.ToString ();
int charsWritten = rune.EncodeToUtf16 (charBuffer);
ReadOnlySpan<char> runeChars = charBuffer [..charsWritten];
stringBuilder.Append (runeChars);
}
return str;
return stringBuilder.ToString ();
}
/// <summary>Converts a byte generic collection into a string in the provided encoding (default is UTF8)</summary>