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Copy pathbool-flag.go
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90 lines (79 loc) · 2.2 KB
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/*
* MinIO Cloud Storage, (C) 2017-2019 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package config
import (
"encoding/json"
"fmt"
"strconv"
"strings"
)
// BoolFlag - wrapper bool type.
type BoolFlag bool
// String - returns string of BoolFlag.
func (bf BoolFlag) String() string {
if bf {
return "on"
}
return "off"
}
// MarshalJSON - converts BoolFlag into JSON data.
func (bf BoolFlag) MarshalJSON() ([]byte, error) {
return json.Marshal(bf.String())
}
// UnmarshalJSON - parses given data into BoolFlag.
func (bf *BoolFlag) UnmarshalJSON(data []byte) (err error) {
var s string
if err = json.Unmarshal(data, &s); err == nil {
b := BoolFlag(true)
if s == "" {
// Empty string is treated as valid.
*bf = b
} else if b, err = ParseBoolFlag(s); err == nil {
*bf = b
}
}
return err
}
// FormatBool prints stringified version of boolean.
func FormatBool(b bool) string {
if b {
return "on"
}
return "off"
}
// ParseBool returns the boolean value represented by the string.
// It accepts 1, t, T, TRUE, true, True, 0, f, F, FALSE, false, False.
// Any other value returns an error.
func ParseBool(str string) (bool, error) {
switch str {
case "1", "t", "T", "true", "TRUE", "True", "on", "ON", "On":
return true, nil
case "0", "f", "F", "false", "FALSE", "False", "off", "OFF", "Off":
return false, nil
}
if strings.EqualFold(str, "enabled") {
return true, nil
}
if strings.EqualFold(str, "disabled") {
return false, nil
}
return false, fmt.Errorf("ParseBool: parsing '%s': %s", str, strconv.ErrSyntax)
}
// ParseBoolFlag - parses string into BoolFlag.
func ParseBoolFlag(s string) (bf BoolFlag, err error) {
b, err := ParseBool(s)
return BoolFlag(b), err
}