示例#1
0
文件: quick.go 项目: go-nosql/golang
// randFloat64 generates a random float taking the full range of a float64.
func randFloat64(rand *rand.Rand) float64 {
	f := rand.Float64()
	if rand.Int()&1 == 1 {
		f = -f
	}
	return f
}
示例#2
0
文件: quick.go 项目: go-nosql/golang
// randFloat32 generates a random float taking the full range of a float32.
func randFloat32(rand *rand.Rand) float32 {
	f := rand.Float64() * math.MaxFloat32
	if rand.Int()&1 == 1 {
		f = -f
	}
	return float32(f)
}
示例#3
0
文件: quick.go 项目: go-nosql/golang
// Value returns an arbitrary value of the given type.
// If the type implements the Generator interface, that will be used.
// Note: in order to create arbitrary values for structs, all the members must be public.
func Value(t reflect.Type, rand *rand.Rand) (value reflect.Value, ok bool) {
	if m, ok := reflect.Zero(t).Interface().(Generator); ok {
		return m.Generate(rand, complexSize), true
	}

	switch concrete := t; concrete.Kind() {
	case reflect.Bool:
		return reflect.ValueOf(rand.Int()&1 == 0), true
	case reflect.Float32:
		return reflect.ValueOf(randFloat32(rand)), true
	case reflect.Float64:
		return reflect.ValueOf(randFloat64(rand)), true
	case reflect.Complex64:
		return reflect.ValueOf(complex(randFloat32(rand), randFloat32(rand))), true
	case reflect.Complex128:
		return reflect.ValueOf(complex(randFloat64(rand), randFloat64(rand))), true
	case reflect.Int16:
		return reflect.ValueOf(int16(randInt64(rand))), true
	case reflect.Int32:
		return reflect.ValueOf(int32(randInt64(rand))), true
	case reflect.Int64:
		return reflect.ValueOf(randInt64(rand)), true
	case reflect.Int8:
		return reflect.ValueOf(int8(randInt64(rand))), true
	case reflect.Int:
		return reflect.ValueOf(int(randInt64(rand))), true
	case reflect.Uint16:
		return reflect.ValueOf(uint16(randInt64(rand))), true
	case reflect.Uint32:
		return reflect.ValueOf(uint32(randInt64(rand))), true
	case reflect.Uint64:
		return reflect.ValueOf(uint64(randInt64(rand))), true
	case reflect.Uint8:
		return reflect.ValueOf(uint8(randInt64(rand))), true
	case reflect.Uint:
		return reflect.ValueOf(uint(randInt64(rand))), true
	case reflect.Uintptr:
		return reflect.ValueOf(uintptr(randInt64(rand))), true
	case reflect.Map:
		numElems := rand.Intn(complexSize)
		m := reflect.MakeMap(concrete)
		for i := 0; i < numElems; i++ {
			key, ok1 := Value(concrete.Key(), rand)
			value, ok2 := Value(concrete.Elem(), rand)
			if !ok1 || !ok2 {
				return reflect.Value{}, false
			}
			m.SetMapIndex(key, value)
		}
		return m, true
	case reflect.Ptr:
		v, ok := Value(concrete.Elem(), rand)
		if !ok {
			return reflect.Value{}, false
		}
		p := reflect.New(concrete.Elem())
		p.Elem().Set(v)
		return p, true
	case reflect.Slice:
		numElems := rand.Intn(complexSize)
		s := reflect.MakeSlice(concrete, numElems, numElems)
		for i := 0; i < numElems; i++ {
			v, ok := Value(concrete.Elem(), rand)
			if !ok {
				return reflect.Value{}, false
			}
			s.Index(i).Set(v)
		}
		return s, true
	case reflect.String:
		numChars := rand.Intn(complexSize)
		codePoints := make([]int, numChars)
		for i := 0; i < numChars; i++ {
			codePoints[i] = rand.Intn(0x10ffff)
		}
		return reflect.ValueOf(string(codePoints)), true
	case reflect.Struct:
		s := reflect.New(t).Elem()
		for i := 0; i < s.NumField(); i++ {
			v, ok := Value(concrete.Field(i).Type, rand)
			if !ok {
				return reflect.Value{}, false
			}
			s.Field(i).Set(v)
		}
		return s, true
	default:
		return reflect.Value{}, false
	}

	return
}
示例#4
0
// Value returns an arbitrary value of the given type.
// If the type implements the Generator interface, that will be used.
// Note: in order to create arbitrary values for structs, all the members must be public.
func Value(t reflect.Type, rand *rand.Rand) (value reflect.Value, ok bool) {
	if m, ok := reflect.MakeZero(t).Interface().(Generator); ok {
		return m.Generate(rand, complexSize), true
	}

	switch concrete := t.(type) {
	case *reflect.BoolType:
		return reflect.NewValue(rand.Int()&1 == 0), true
	case *reflect.Float32Type:
		return reflect.NewValue(randFloat32(rand)), true
	case *reflect.Float64Type:
		return reflect.NewValue(randFloat64(rand)), true
	case *reflect.FloatType:
		if t.Size() == 4 {
			return reflect.NewValue(float(randFloat32(rand))), true
		} else {
			return reflect.NewValue(float(randFloat64(rand))), true
		}
	case *reflect.Int16Type:
		return reflect.NewValue(int16(randInt64(rand))), true
	case *reflect.Int32Type:
		return reflect.NewValue(int32(randInt64(rand))), true
	case *reflect.Int64Type:
		return reflect.NewValue(randInt64(rand)), true
	case *reflect.Int8Type:
		return reflect.NewValue(int8(randInt64(rand))), true
	case *reflect.IntType:
		return reflect.NewValue(int(randInt64(rand))), true
	case *reflect.MapType:
		numElems := rand.Intn(complexSize)
		m := reflect.MakeMap(concrete)
		for i := 0; i < numElems; i++ {
			key, ok1 := Value(concrete.Key(), rand)
			value, ok2 := Value(concrete.Elem(), rand)
			if !ok1 || !ok2 {
				return nil, false
			}
			m.SetElem(key, value)
		}
		return m, true
	case *reflect.PtrType:
		v, ok := Value(concrete.Elem(), rand)
		if !ok {
			return nil, false
		}
		p := reflect.MakeZero(concrete)
		p.(*reflect.PtrValue).PointTo(v)
		return p, true
	case *reflect.SliceType:
		numElems := rand.Intn(complexSize)
		s := reflect.MakeSlice(concrete, numElems, numElems)
		for i := 0; i < numElems; i++ {
			v, ok := Value(concrete.Elem(), rand)
			if !ok {
				return nil, false
			}
			s.Elem(i).SetValue(v)
		}
		return s, true
	case *reflect.StringType:
		numChars := rand.Intn(complexSize)
		codePoints := make([]int, numChars)
		for i := 0; i < numChars; i++ {
			codePoints[i] = rand.Intn(0x10ffff)
		}
		return reflect.NewValue(string(codePoints)), true
	case *reflect.StructType:
		s := reflect.MakeZero(t).(*reflect.StructValue)
		for i := 0; i < s.NumField(); i++ {
			v, ok := Value(concrete.Field(i).Type, rand)
			if !ok {
				return nil, false
			}
			s.Field(i).SetValue(v)
		}
		return s, true
	case *reflect.Uint16Type:
		return reflect.NewValue(uint16(randInt64(rand))), true
	case *reflect.Uint32Type:
		return reflect.NewValue(uint32(randInt64(rand))), true
	case *reflect.Uint64Type:
		return reflect.NewValue(uint64(randInt64(rand))), true
	case *reflect.Uint8Type:
		return reflect.NewValue(uint8(randInt64(rand))), true
	case *reflect.UintType:
		return reflect.NewValue(uint(randInt64(rand))), true
	case *reflect.UintptrType:
		return reflect.NewValue(uintptr(randInt64(rand))), true
	default:
		return nil, false
	}

	return
}
示例#5
0
文件: mandel.go 项目: ineol/mandelgo
func uint8rand(r *rand.Rand) uint8 {
	return uint8(r.Int() % 255)
}