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Copyright 2017 The Kubernetes Authors.
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
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
package flag
import (
// MapStringBool can be set from the command line with the format `--flag "string=bool"`.
// Multiple comma-separated key-value pairs in a single invocation are supported. For example: `--flag "a=true,b=false"`.
// Multiple flag invocations are supported. For example: `--flag "a=true" --flag "b=false"`.
type MapStringBool struct {
Map *map[string]bool
initialized bool
// NewMapStringBool takes a pointer to a map[string]string and returns the
// MapStringBool flag parsing shim for that map
func NewMapStringBool(m *map[string]bool) *MapStringBool {
return &MapStringBool{Map: m}
// String implements
func (m *MapStringBool) String() string {
if m == nil || m.Map == nil {
return ""
pairs := []string{}
for k, v := range *m.Map {
pairs = append(pairs, fmt.Sprintf("%s=%t", k, v))
return strings.Join(pairs, ",")
// Set implements
func (m *MapStringBool) Set(value string) error {
if m.Map == nil {
return fmt.Errorf("no target (nil pointer to map[string]bool)")
if !m.initialized || *m.Map == nil {
// clear default values, or allocate if no existing map
*m.Map = make(map[string]bool)
m.initialized = true
for _, s := range strings.Split(value, ",") {
if len(s) == 0 {
arr := strings.SplitN(s, "=", 2)
if len(arr) != 2 {
return fmt.Errorf("malformed pair, expect string=bool")
k := strings.TrimSpace(arr[0])
v := strings.TrimSpace(arr[1])
boolValue, err := strconv.ParseBool(v)
if err != nil {
return fmt.Errorf("invalid value of %s: %s, err: %v", k, v, err)
(*m.Map)[k] = boolValue
return nil
// Type implements
func (*MapStringBool) Type() string {
return "mapStringBool"
// Empty implements OmitEmpty
func (m *MapStringBool) Empty() bool {
return len(*m.Map) == 0
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