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Copy pathstring_processing_benchmark_test.go
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200 lines (193 loc) · 5.31 KB
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package regexp2
import (
"strings"
"testing"
)
func BenchmarkFindStringMatchMixed(b *testing.B) {
for _, tc := range []struct{ name, pattern string }{
{"Literal", `^a+$`},
{"RepeatedCapture", `^(a)+$`},
} {
b.Run(tc.name, func(b *testing.B) {
re := MustCompile(tc.pattern)
hit := strings.Repeat("a", 256)
miss := hit[:len(hit)-1] + "b"
b.ReportAllocs()
// Each iteration measures a miss followed by a hit on the same regexp.
for b.Loop() {
if m, err := re.FindStringMatch(miss); m != nil || err != nil {
b.Fatal(m, err)
}
if m, err := re.FindStringMatch(hit); m == nil || err != nil {
b.Fatal(m, err)
}
}
})
}
}
func BenchmarkFindNextMatch(b *testing.B) {
for _, tc := range []struct{ name, pattern string }{
{"Literal", `[ab]`},
{"Capture", `([ab])`},
} {
b.Run(tc.name, func(b *testing.B) {
re := MustCompile(tc.pattern)
first, err := re.FindStringMatch("a b")
if err != nil || first == nil {
b.Fatal(first, err)
}
b.ReportAllocs()
for b.Loop() {
if m, err := re.FindNextMatch(first); m == nil || err != nil || m.String() != "b" {
b.Fatal(m, err)
}
}
})
}
}
func BenchmarkStringOperationsNoMatch(b *testing.B) {
for _, tc := range []struct {
name, pattern, input string
options RegexOptions
}{
{"Anchored", `^func\b`, strings.Repeat("x := someIdentifier + 42 // comment\n", 100), None},
{"RejectedCandidate", `func\b`, "funcx" + strings.Repeat("x", 3400), None},
{"RightToLeft", `func\b`, strings.Repeat("x", 3400), RightToLeft},
} {
for _, api := range []struct {
name string
call func(*Regexp, string) error
}{
{"FindStringMatch", func(re *Regexp, input string) error {
_, err := re.FindStringMatch(input)
return err
}},
{"Replace", func(re *Regexp, input string) error {
_, err := re.Replace(input, "replacement", -1, -1)
return err
}},
{"ReplaceFunc", func(re *Regexp, input string) error {
_, err := re.ReplaceFunc(input, func(Match) string { return "replacement" }, -1, -1)
return err
}},
{"Split", func(re *Regexp, input string) error {
_, err := re.Split(input, -1)
return err
}},
{"FindAllStringIndex", func(re *Regexp, input string) error {
_, err := re.FindAllStringIndex(input, 100)
return err
}},
} {
b.Run(api.name+"/"+tc.name, func(b *testing.B) {
re := MustCompile(tc.pattern, tc.options)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
if err := api.call(re, tc.input); err != nil {
b.Fatal(err)
}
}
})
}
}
}
func BenchmarkFindAllRunesIndexNoMatch(b *testing.B) {
re := MustCompile(`^func\b`)
input := []rune("x := someIdentifier + 42")
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
if got, err := re.FindAllRunesIndex(input, 100); len(got) != 0 || err != nil {
b.Fatal(got, err)
}
}
}
func BenchmarkStringProcessing(b *testing.B) {
for _, tc := range []struct {
name, input string
options RegexOptions
}{
{"ASCII", "needle" + strings.Repeat("x", 64<<10), None},
{"Unicode", "needle" + strings.Repeat("界", 21845), None},
{"UnicodeRTL", strings.Repeat("界", 21845) + "needle", RightToLeft},
} {
b.Run("FindAll/"+tc.name, func(b *testing.B) {
re := MustCompile(`needle`, tc.options)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
got, err := re.FindAllStringIndex(tc.input, 1)
if err != nil || len(got) != 1 || tc.input[got[0][0]:got[0][1]] != "needle" {
b.Fatal(got, err)
}
}
})
b.Run("FindMatch/"+tc.name, func(b *testing.B) {
re := MustCompile(`needle`, tc.options)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
got, err := re.FindStringMatch(tc.input)
if err != nil || got == nil || got.String() != "needle" {
b.Fatal(got, err)
}
}
})
}
for _, tc := range []struct {
name, input string
options RegexOptions
}{
{"Miss", strings.Repeat("x", 64<<10), None},
{"LateHit", strings.Repeat("x", 64<<10) + "needle", None},
{"LateHitRTL", strings.Repeat("x", 64<<10) + "needle", RightToLeft},
{"ManyHitsRTL", strings.Repeat("xxneedlexx", 256), RightToLeft},
{"ShortHit", "xxneedlexx", None},
} {
b.Run("Replace/"+tc.name, func(b *testing.B) {
re := MustCompile(`needle`, tc.options)
want := strings.ReplaceAll(tc.input, "needle", "pin")
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
got, err := re.Replace(tc.input, "pin", -1, -1)
if err != nil || got != want {
b.Fatal(got, err)
}
}
})
}
for _, tc := range []struct {
name, pattern string
want int
}{
{"NoCaptures", `,`, 1001}, {"Captures", `(,)`, 2001},
} {
b.Run("Split/"+tc.name, func(b *testing.B) {
re := MustCompile(tc.pattern)
input := strings.Repeat("abc,", 1000) + "abc"
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
got, err := re.Split(input, -1)
if err != nil || len(got) != tc.want {
b.Fatal(len(got), err)
}
}
})
}
}
func BenchmarkSplitUnicodePrefix(b *testing.B) {
re := MustCompile(`(needle)`)
prefix := strings.Repeat("界", 21845)
input := prefix + "needle尾"
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
got, err := re.Split(input, -1)
if err != nil || len(got) != 3 || got[0] != prefix || got[1] != "needle" || got[2] != "尾" {
b.Fatal(got, err)
}
}
}