Changes to vt/cache_sweep_test.go. All files

vt/cache_sweep_test.go

new file mode 100644@@ -0,0 +1,103 @@+// Copyright 2026 The TCell Authors+//+// Licensed under the Apache License, Version 2.0 (the "License");+// you may not use this file except in compliance with the License.+// You may obtain a copy of the License at+//+//	http://www.apache.org/licenses/LICENSE-2.0+//+// Unless required by applicable law or agreed to in writing, software+// distributed under the License is distributed on an "AS IS" BASIS,+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.+// See the License for the specific language governing permissions and+// limitations under the License.++package vt++import (+	"fmt"+	"testing"+	"unicode/utf8"+)++type benchRuneCache struct {+	entries []benchRuneCacheEntry+	n       int+}++type benchRuneCacheEntry struct {+	r rune+	s string+}++func newBenchRuneCache(size int) *benchRuneCache {+	return &benchRuneCache{entries: make([]benchRuneCacheEntry, size)}+}++func (c *benchRuneCache) stringFor(r rune) string {+	if r < utf8.RuneSelf {+		return asciiRuneStrings[r]+	}++	for i := 0; i < c.n; i++ {+		if c.entries[i].r == r {+			return c.entries[i].s+		}+	}++	s := string(r)+	if c.n < len(c.entries) {+		c.n+++	}+	copy(c.entries[1:c.n], c.entries[:c.n-1])+	c.entries[0] = benchRuneCacheEntry{r: r, s: s}+	return s+}++var sweepMixedRunes32 = []rune{+	'\u0416', '\u0414', '\u042E', '\u042F',+	'\u041F', '\u041B', '\u0424', '\u042B',+	'\u042D', '\u0411', '\u0413', '\u0428',+	'\u00E9', '\u00F6', '\u00FC', '\u00F1',+	'\u00E7', '\u00F8', '\u00E5', '\u00DF',+	'\u0142', '\u0111', '\u0127', '\u0131',+	'\U0001F600', '\U0001F680', '\U0001F9EA', '\U0001F525',+	'\U0001F355', '\U0001F389', '\U0001F4BB', '\U0001F4E6',+}++var sweepMixedRunes64 = append(append([]rune{}, sweepMixedRunes32...),+	'\u0105', '\u0107', '\u0119', '\u0123',+	'\u0135', '\u0137', '\u0144', '\u015B',+	'\u015F', '\u0163', '\u0165', '\u017A',+	'\U0001F31F', '\U0001F4A1', '\U0001F4AF', '\U0001F680',+	'\U0001F9F0', '\U0001F9D1', '\U0001F9EB', '\U0001FAE0',+	'\u250C', '\u2510', '\u2514', '\u2518',+	'\u2500', '\u2502', '\u251C', '\u2524',+	'\u252C', '\u2534', '\u253C', '\u2571',+)++func BenchmarkRuneStringCacheSweep(b *testing.B) {+	for _, tc := range []struct {+		name string+		seq  []rune+	}{+		{name: "mixed32", seq: sweepMixedRunes32},+		{name: "mixed64", seq: sweepMixedRunes64},+	} {+		b.Run(tc.name, func(b *testing.B) {+			for _, size := range []int{8, 16, 32, 64} {+				b.Run(fmt.Sprintf("size=%d", size), func(b *testing.B) {+					cache := newBenchRuneCache(size)+					for _, r := range tc.seq {+						_ = cache.stringFor(r)+					}+					b.ReportAllocs()+					b.ResetTimer()+					for i := 0; i < b.N; i++ {+						_ = cache.stringFor(tc.seq[i%len(tc.seq)])+					}+				})+			}+		})+	}+}