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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package go1
import (
"math/rand"
"regexp"
"testing"
)
// benchmark based on regexp/exec_test.go
var regexpText []byte
func makeRegexpText(n int) []byte {
rand.Seed(0) // For reproducibility.
if len(regexpText) >= n {
return regexpText[:n]
}
regexpText = make([]byte, n)
for i := range regexpText {
if rand.Intn(30) == 0 {
regexpText[i] = '\n'
} else {
regexpText[i] = byte(rand.Intn(0x7E+1-0x20) + 0x20)
}
}
return regexpText
}
func benchmark(b *testing.B, re string, n int) {
r := regexp.MustCompile(re)
t := makeRegexpText(n)
b.ResetTimer()
b.SetBytes(int64(n))
for i := 0; i < b.N; i++ {
if r.Match(t) {
b.Fatal("match!")
}
}
}
const (
easy0 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
easy1 = "A[AB]B[BC]C[CD]D[DE]E[EF]F[FG]G[GH]H[HI]I[IJ]J$"
medium = "[XYZ]ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
hard = "[ -~]*ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
)
func BenchmarkRegexpMatchEasy0_32(b *testing.B) { benchmark(b, easy0, 32<<0) }
func BenchmarkRegexpMatchEasy0_1K(b *testing.B) { benchmark(b, easy0, 1<<10) }
func BenchmarkRegexpMatchEasy1_32(b *testing.B) { benchmark(b, easy1, 32<<0) }
func BenchmarkRegexpMatchEasy1_1K(b *testing.B) { benchmark(b, easy1, 1<<10) }
func BenchmarkRegexpMatchMedium_32(b *testing.B) { benchmark(b, medium, 1<<0) }
func BenchmarkRegexpMatchMedium_1K(b *testing.B) { benchmark(b, medium, 1<<10) }
func BenchmarkRegexpMatchHard_32(b *testing.B) { benchmark(b, hard, 32<<0) }
func BenchmarkRegexpMatchHard_1K(b *testing.B) { benchmark(b, hard, 1<<10) }
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