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StringExtensions.ToString(IEnumerable<Rune>) remove extra rune chars copy

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Tonttu
2025-03-16 00:37:59 +02:00
committed by Tig
parent 2e4e73a436
commit 9b78961a03
1 changed files with 4 additions and 7 deletions
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11
Terminal.Gui/Text/StringExtensions.cs
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@@ -125,10 +125,8 @@ public static class StringExtensions
public static string ToString (IEnumerable<Rune> runes)
{
const int maxCharsPerRune = 2;
// Max stackalloc ~2 kB
const int maxStackallocTextBufferSize = 1048;
const int maxStackallocTextBufferSize = 1048; // ~2 kB
Span<char> runeBuffer = stackalloc char[maxCharsPerRune];
// Use stackalloc buffer if rune count is easily available and the count is reasonable.
if (runes.TryGetNonEnumeratedCount (out int count))
{
@@ -144,10 +142,8 @@ public static class StringExtensions
Span<char> remainingBuffer = textBuffer;
foreach (Rune rune in runes)
{
int charsWritten = rune.EncodeToUtf16 (runeBuffer);
ReadOnlySpan<char> runeChars = runeBuffer [..charsWritten];
runeChars.CopyTo (remainingBuffer);
remainingBuffer = remainingBuffer [runeChars.Length..];
int charsWritten = rune.EncodeToUtf16 (remainingBuffer);
remainingBuffer = remainingBuffer [charsWritten..];
}
ReadOnlySpan<char> text = textBuffer[..^remainingBuffer.Length];
@@ -157,6 +153,7 @@ public static class StringExtensions
// Fallback to StringBuilder append.
StringBuilder stringBuilder = new();
Span<char> runeBuffer = stackalloc char[maxCharsPerRune];
foreach (Rune rune in runes)
{
int charsWritten = rune.EncodeToUtf16 (runeBuffer);