Golang Value.OverflowFloat方法代码示例

func numberDecoder(node RMNode, data interface{}, v reflect.Value) {
	val, err := redis.String(data, nil)
	if err != nil {
		panic(err)
	}

	switch v.Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		n, err := strconv.ParseInt(val, 10, 64)
		if err != nil || v.OverflowInt(n) {
			panic(fmt.Sprintf("Unable to convert int: %s \n", val))
		}
		v.SetInt(n)

	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		n, err := strconv.ParseUint(val, 10, 64)
		if err != nil || v.OverflowUint(n) {
			panic(fmt.Sprintf("Unable to convert uint: %s \n", val))
		}
		v.SetUint(n)

	case reflect.Float32, reflect.Float64:
		n, err := strconv.ParseFloat(val, v.Type().Bits())
		if err != nil || v.OverflowFloat(n) {
			panic(fmt.Sprintf("Unable to convert float: %s \n", val))
		}
		v.SetFloat(n)

	default:
		panic(fmt.Sprintf("Unsupported number convertion for type[%v] with value[%v]", v.Type(), data))
	}
}

func setFloat(v reflect.Value, x interface{}) error {
	xx := x.(float64)
	if v.OverflowFloat(xx) {
		return fmt.Errorf("bigquery: value %v overflows struct field of type %v", xx, v.Type())
	}
	v.SetFloat(xx)
	return nil
}

func setStringValue(v reflect.Value, value string) (err error) {
	s := value

	// if type is []byte
	if v.Kind() == reflect.Slice && v.Type().Elem().Kind() == reflect.Uint8 {
		v.SetBytes([]byte(s))
		return
	}

	switch v.Kind() {
	case reflect.String:
		v.SetString(s)
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		var n int64
		n, err = strconv.ParseInt(s, 10, 64)
		if err != nil {
			return
		}
		if v.OverflowInt(n) {
			err = fmt.Errorf("overflow int64 for %d.", n)
			return
		}
		v.SetInt(n)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		var n uint64
		n, err = strconv.ParseUint(s, 10, 64)
		if err != nil {
			return
		}
		if v.OverflowUint(n) {
			err = fmt.Errorf("overflow uint64 for %d.", n)
			return
		}
		v.SetUint(n)
	case reflect.Float32, reflect.Float64:
		var n float64
		n, err = strconv.ParseFloat(s, v.Type().Bits())
		if err != nil {
			return
		}
		if v.OverflowFloat(n) {
			err = fmt.Errorf("overflow float64 for %d.", n)
			return
		}
		v.SetFloat(n)
	case reflect.Bool:
		var n bool
		n, err = strconv.ParseBool(s)
		if err != nil {
			return
		}
		v.SetBool(n)
	default:
		err = errors.New(fmt.Sprintf("value %+v can only been set to primary type but was %+v", value, v))
	}

	return
}

func resolve_float(val string, v reflect.Value, useNumber bool) (string, error) {
	val = strings.Replace(val, "_", "", -1)
	var value float64

	isNumberValue := v.Type() == numberType
	typeBits := 64
	if !isNumberValue {
		typeBits = v.Type().Bits()
	}

	sign := 1
	if val[0] == '-' {
		sign = -1
		val = val[1:]
	} else if val[0] == '+' {
		val = val[1:]
	}

	valLower := strings.ToLower(val)
	if valLower == ".inf" {
		value = math.Inf(sign)
	} else if valLower == ".nan" {
		value = math.NaN()
	} else if strings.Contains(val, ":") {
		digits := strings.Split(val, ":")
		bes := float64(1)
		for j := len(digits) - 1; j >= 0; j-- {
			n, err := strconv.ParseFloat(digits[j], typeBits)
			n *= bes
			if err != nil {
				return "", errors.New("Float: " + val)
			}
			value += n
			bes *= 60
		}
		value *= float64(sign)
	} else {
		var err error
		value, err = strconv.ParseFloat(val, typeBits)
		value *= float64(sign)

		if err != nil {
			return "", errors.New("Float: " + val)
		}
	}

	if isNumberValue {
		v.SetString(strconv.FormatFloat(value, 'g', -1, typeBits))
	} else {
		if v.OverflowFloat(value) {
			return "", errors.New("Float: " + val)
		}

		v.SetFloat(value)
	}

	return "!!float", nil
}

func (d *Decoder) decodeNumber(n *string, v reflect.Value) error {
	switch v.Kind() {
	case reflect.Interface:
		i, err := d.decodeNumberToInterface(n)
		if err != nil {
			return err
		}
		v.Set(reflect.ValueOf(i))
		return nil
	case reflect.String:
		if v.Type() == numberType { // Support Number value type
			v.Set(reflect.ValueOf(Number(*n)))
			return nil
		}
		v.Set(reflect.ValueOf(*n))
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		i, err := strconv.ParseInt(*n, 10, 64)
		if err != nil {
			return err
		}
		if v.OverflowInt(i) {
			return &UnmarshalTypeError{
				Value: fmt.Sprintf("number overflow, %s", *n),
				Type:  v.Type(),
			}
		}
		v.SetInt(i)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		i, err := strconv.ParseUint(*n, 10, 64)
		if err != nil {
			return err
		}
		if v.OverflowUint(i) {
			return &UnmarshalTypeError{
				Value: fmt.Sprintf("number overflow, %s", *n),
				Type:  v.Type(),
			}
		}
		v.SetUint(i)
	case reflect.Float32, reflect.Float64:
		i, err := strconv.ParseFloat(*n, 64)
		if err != nil {
			return err
		}
		if v.OverflowFloat(i) {
			return &UnmarshalTypeError{
				Value: fmt.Sprintf("number overflow, %s", *n),
				Type:  v.Type(),
			}
		}
		v.SetFloat(i)
	default:
		return &UnmarshalTypeError{Value: "number", Type: v.Type()}
	}

	return nil
}

func decodeFloat(rval reflect.Value, arg string) error {
	v, err := strconv.ParseFloat(arg, 64)
	if err != nil {
		return err
	}
	if rval.OverflowFloat(v) {
		return fmt.Errorf("value %f would overflow %s", v, rval.Kind())
	}
	rval.Set(reflect.ValueOf(v).Convert(rval.Type()))
	return nil
}

func unmarshalStringToNumberOrBoolean(d *decodeState, s []byte, v reflect.Value, fromQuoted bool) {
	if fromQuoted {
		d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
		return
	}
	switch {
	default:
		d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
	case isValidNumberBytes(s):
		switch v.Kind() {
		default:
			d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			s := string(s)
			n, err := strconv.ParseInt(s, 10, 64)
			if err != nil || v.OverflowInt(n) {
				d.saveError(&UnmarshalTypeError{"string " + s, v.Type(), int64(d.off)})
				break
			}
			v.SetInt(n)
		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
			s := string(s)
			n, err := strconv.ParseUint(s, 10, 64)
			if err != nil || v.OverflowUint(n) {
				d.saveError(&UnmarshalTypeError{"string " + s, v.Type(), int64(d.off)})
				break
			}
			v.SetUint(n)
		case reflect.Float32, reflect.Float64:
			s := string(s)
			n, err := strconv.ParseFloat(s, v.Type().Bits())
			if err != nil || v.OverflowFloat(n) {
				d.saveError(&UnmarshalTypeError{"string " + s, v.Type(), int64(d.off)})
				break
			}
			v.SetFloat(n)
		}
	case bytes.Equal(s, trueLiteral):
		switch v.Kind() {
		default:
			d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
		case reflect.Bool:
			v.SetBool(true)
		}
	case bytes.Equal(s, falseLiteral):
		switch v.Kind() {
		default:
			d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
		case reflect.Bool:
			v.SetBool(false)
		}
	}
}

func unmarshalFloat(f float64, v reflect.Value) {
	switch v.Kind() {
	case reflect.Float32, reflect.Float64:
		if v.OverflowFloat(f) {
			panic(&UnmarshalOverflowError{"float " + strconv.FormatFloat(f, 'g', -1, 64), v.Type()})
		}
		v.SetFloat(f)
	case reflect.Interface:
		if v.NumMethod() == 0 {
			v.Set(reflect.ValueOf(f))
			return
		}
		fallthrough
	default:
		panic(&UnmarshalTypeError{"float " + strconv.FormatFloat(f, 'g', -1, 64), v.Type()})
	}
}

func resolve_float(val string, v reflect.Value, useNumber bool, event yaml_event_t) (string, error) {
	val = strings.Replace(val, "_", "", -1)
	var value float64

	isNumberValue := v.Type() == numberType
	typeBits := 64
	if !isNumberValue {
		typeBits = v.Type().Bits()
	}

	sign := 1
	if val[0] == '-' {
		sign = -1
		val = val[1:]
	} else if val[0] == '+' {
		val = val[1:]
	}

	valLower := strings.ToLower(val)
	if valLower == ".inf" {
		value = math.Inf(sign)
	} else if valLower == ".nan" {
		value = math.NaN()
	} else {
		var err error
		value, err = strconv.ParseFloat(val, typeBits)
		value *= float64(sign)

		if err != nil {
			return "", fmt.Errorf("Invalid float: '%s' at %s", val, event.start_mark)
		}
	}

	if isNumberValue {
		v.SetString(strconv.FormatFloat(value, 'g', -1, typeBits))
	} else {
		if v.OverflowFloat(value) {
			return "", fmt.Errorf("Invalid float: '%s' at %s", val, event.start_mark)
		}

		v.SetFloat(value)
	}

	return yaml_FLOAT_TAG, nil
}

func (d *decodeState) numberStore(item []byte, v reflect.Value, fromQuoted bool) {
	s := string(item)
	switch v.Kind() {
	default:
		if v.Kind() == reflect.String && v.Type() == numberType {
			v.SetString(s)
			break
		}
		if fromQuoted {
			d.error(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
		}
		d.error(&UnmarshalTypeError{"number", v.Type()})
	case reflect.Interface:
		n, err := d.convertNumber(string(item))
		if err != nil {
			d.saveError(err)
			break
		}
		v.Set(reflect.ValueOf(n))

	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		n, err := strconv.ParseInt(s, 10, 64)
		if err != nil || v.OverflowInt(n) {
			d.saveError(&UnmarshalTypeError{"number " + s, v.Type()})
			break
		}
		v.SetInt(n)

	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		n, err := strconv.ParseUint(s, 10, 64)
		if err != nil || v.OverflowUint(n) {
			d.saveError(&UnmarshalTypeError{"number " + s, v.Type()})
			break
		}
		v.SetUint(n)

	case reflect.Float32, reflect.Float64:
		n, err := strconv.ParseFloat(s, v.Type().Bits())
		if err != nil || v.OverflowFloat(n) {
			d.saveError(&UnmarshalTypeError{"number " + s, v.Type()})
			break
		}
		v.SetFloat(n)
	}
}

func setFloat(fv reflect.Value, v *ast.Float) error {
	f, err := v.Float()
	if err != nil {
		return err
	}
	switch fv.Kind() {
	case reflect.Float32, reflect.Float64:
		if fv.OverflowFloat(f) {
			return &errorOutOfRange{fv.Kind(), f}
		}
		fv.SetFloat(f)
	case reflect.Interface:
		fv.Set(reflect.ValueOf(f))
	default:
		return fmt.Errorf("`%v' is not float32 or float64", fv.Type())
	}
	return nil
}

func decodeFloat(d *decodeState, kind int, v reflect.Value) {
	var f float64
	switch kind {
	default:
		d.saveErrorAndSkip(kind, v.Type())
		return
	case kindFloat:
		f = d.scanFloat()
	case kindInt64:
		f = float64(d.scanInt64())
	case kindInt32:
		f = float64(d.scanInt32())
	}
	if v.OverflowFloat(f) {
		d.saveError(&DecodeConvertError{kind, v.Type()})
		return
	}
	v.SetFloat(f)
}

// Set Value with given string
func (d *decodeState) setValue(v reflect.Value, s string) {
	//fmt.Printf("SET(kind:%s, %s)\n", v.Kind(), s)

	switch v.Kind() {

	case reflect.String:
		v.SetString(s)

	case reflect.Bool:
		v.SetBool(boolValue(s))

	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		n, err := strconv.ParseInt(s, 10, 64)
		if err != nil || v.OverflowInt(n) {
			d.saveError(&IniError{d.lineNum, d.line, "Invalid int"})
			return
		}
		v.SetInt(n)

	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		n, err := strconv.ParseUint(s, 10, 64)
		if err != nil || v.OverflowUint(n) {
			d.saveError(&IniError{d.lineNum, d.line, "Invalid uint"})
			return
		}
		v.SetUint(n)

	case reflect.Float32, reflect.Float64:
		n, err := strconv.ParseFloat(s, v.Type().Bits())
		if err != nil || v.OverflowFloat(n) {
			d.saveError(&IniError{d.lineNum, d.line, "Invalid float"})
			return
		}
		v.SetFloat(n)

	case reflect.Slice:
		d.sliceValue(v, s)

	default:
		d.saveError(&IniError{d.lineNum, d.line, fmt.Sprintf("Can't set value of type %s", v.Kind())})
	}

}

func unmarshalQuoted(s string, v reflect.Value) {
	switch v.Kind() {
	case reflect.Bool:
		b, err := strconv.ParseBool(s)
		if err != nil {
			panic(err)
		}
		v.SetBool(b)
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		i, err := strconv.ParseInt(s, 10, 64)
		if err != nil {
			panic(err)
		}
		if v.OverflowInt(i) {
			goto overflowError
		}
		v.SetInt(i)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		u, err := strconv.ParseUint(s, 10, 64)
		if err != nil {
			panic(err)
		}
		if v.OverflowUint(u) {
			goto overflowError
		}
		v.SetUint(u)
	case reflect.Float32, reflect.Float64:
		f, err := strconv.ParseFloat(s, 64)
		if err != nil {
			panic(err)
		}
		if v.OverflowFloat(f) {
			goto overflowError
		}
		v.SetFloat(f)
	default:
		panic("toml: unexpected type for quoted string")
	}
	return
overflowError:
	panic(&UnmarshalOverflowError{"string " + strconv.Quote(s), v.Type()})
}

func resolve_float(val string, v reflect.Value) error {
	val = strings.Replace(val, "_", "", -1)
	var value float64

	sign := 1
	if val[0] == '-' {
		sign = -1
		val = val[1:]
	} else if val[0] == '+' {
		val = val[1:]
	}

	valLower := strings.ToLower(val)
	if valLower == ".inf" {
		value = math.Inf(sign)
	} else if valLower == ".nan" {
		value = math.NaN()
	} else if strings.Contains(val, ":") {
		digits := strings.Split(val, ":")
		bes := float64(1)
		for j := len(digits) - 1; j >= 0; j-- {
			n, err := strconv.ParseFloat(digits[j], v.Type().Bits())
			n *= bes
			if err != nil || v.OverflowFloat(n) {
				return errors.New("Float: " + val)
			}
			value += n
			bes *= 60
		}
		value *= float64(sign)
	} else {
		var err error
		value, err = strconv.ParseFloat(val, v.Type().Bits())
		value *= float64(sign)
		if err != nil || v.OverflowFloat(value) {
			return errors.New("Float: " + val)
		}
	}

	v.SetFloat(value)
	return nil
}