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vendor/github.com/syndtr/goleveldb/leveldb/testutil/util.go

@@ -0,0 +1,171 @@
+// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package testutil
+
+import (
+	"bytes"
+	"flag"
+	"math/rand"
+	"reflect"
+	"sync"
+
+	"github.com/onsi/ginkgo/config"
+
+	"github.com/syndtr/goleveldb/leveldb/comparer"
+)
+
+var (
+	runfn = make(map[string][]func())
+	runmu sync.Mutex
+)
+
+func Defer(args ...interface{}) bool {
+	var (
+		group string
+		fn    func()
+	)
+	for _, arg := range args {
+		v := reflect.ValueOf(arg)
+		switch v.Kind() {
+		case reflect.String:
+			group = v.String()
+		case reflect.Func:
+			r := reflect.ValueOf(&fn).Elem()
+			r.Set(v)
+		}
+	}
+	if fn != nil {
+		runmu.Lock()
+		runfn[group] = append(runfn[group], fn)
+		runmu.Unlock()
+	}
+	return true
+}
+
+func RunDefer(groups ...string) bool {
+	if len(groups) == 0 {
+		groups = append(groups, "")
+	}
+	runmu.Lock()
+	var runfn_ []func()
+	for _, group := range groups {
+		runfn_ = append(runfn_, runfn[group]...)
+		delete(runfn, group)
+	}
+	runmu.Unlock()
+	for _, fn := range runfn_ {
+		fn()
+	}
+	return runfn_ != nil
+}
+
+func RandomSeed() int64 {
+	if !flag.Parsed() {
+		panic("random seed not initialized")
+	}
+	return config.GinkgoConfig.RandomSeed
+}
+
+func NewRand() *rand.Rand {
+	return rand.New(rand.NewSource(RandomSeed()))
+}
+
+var cmp = comparer.DefaultComparer
+
+func BytesSeparator(a, b []byte) []byte {
+	if bytes.Equal(a, b) {
+		return b
+	}
+	i, n := 0, len(a)
+	if n > len(b) {
+		n = len(b)
+	}
+	for ; i < n && (a[i] == b[i]); i++ {
+	}
+	x := append([]byte{}, a[:i]...)
+	if i < n {
+		if c := a[i] + 1; c < b[i] {
+			return append(x, c)
+		}
+		x = append(x, a[i])
+		i++
+	}
+	for ; i < len(a); i++ {
+		if c := a[i]; c < 0xff {
+			return append(x, c+1)
+		} else {
+			x = append(x, c)
+		}
+	}
+	if len(b) > i && b[i] > 0 {
+		return append(x, b[i]-1)
+	}
+	return append(x, 'x')
+}
+
+func BytesAfter(b []byte) []byte {
+	var x []byte
+	for _, c := range b {
+		if c < 0xff {
+			return append(x, c+1)
+		} else {
+			x = append(x, c)
+		}
+	}
+	return append(x, 'x')
+}
+
+func RandomIndex(rnd *rand.Rand, n, round int, fn func(i int)) {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+	for x := 0; x < round; x++ {
+		fn(rnd.Intn(n))
+	}
+	return
+}
+
+func ShuffledIndex(rnd *rand.Rand, n, round int, fn func(i int)) {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+	for x := 0; x < round; x++ {
+		for _, i := range rnd.Perm(n) {
+			fn(i)
+		}
+	}
+	return
+}
+
+func RandomRange(rnd *rand.Rand, n, round int, fn func(start, limit int)) {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+	for x := 0; x < round; x++ {
+		start := rnd.Intn(n)
+		length := 0
+		if j := n - start; j > 0 {
+			length = rnd.Intn(j)
+		}
+		fn(start, start+length)
+	}
+	return
+}
+
+func Max(x, y int) int {
+	if x > y {
+		return x
+	}
+	return y
+}
+
+func Min(x, y int) int {
+	if x < y {
+		return x
+	}
+	return y
+}