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- // Copyright 2018 The etcd 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
- //
- // 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 flags
- import (
- "errors"
- "fmt"
- "sort"
- "strings"
- )
- // SelectiveStringValue implements the flag.Value interface.
- type SelectiveStringValue struct {
- v string
- valids map[string]struct{}
- }
- // Set verifies the argument to be a valid member of the allowed values
- // before setting the underlying flag value.
- func (ss *SelectiveStringValue) Set(s string) error {
- if _, ok := ss.valids[s]; ok {
- ss.v = s
- return nil
- }
- return errors.New("invalid value")
- }
- // String returns the set value (if any) of the SelectiveStringValue
- func (ss *SelectiveStringValue) String() string {
- return ss.v
- }
- // Valids returns the list of valid strings.
- func (ss *SelectiveStringValue) Valids() []string {
- s := make([]string, 0, len(ss.valids))
- for k := range ss.valids {
- s = append(s, k)
- }
- sort.Strings(s)
- return s
- }
- // NewSelectiveStringValue creates a new string flag
- // for which any one of the given strings is a valid value,
- // and any other value is an error.
- //
- // valids[0] will be default value. Caller must be sure
- // len(valids) != 0 or it will panic.
- func NewSelectiveStringValue(valids ...string) *SelectiveStringValue {
- vm := make(map[string]struct{})
- for _, v := range valids {
- vm[v] = struct{}{}
- }
- return &SelectiveStringValue{valids: vm, v: valids[0]}
- }
- // SelectiveStringsValue implements the flag.Value interface.
- type SelectiveStringsValue struct {
- vs []string
- valids map[string]struct{}
- }
- // Set verifies the argument to be a valid member of the allowed values
- // before setting the underlying flag value.
- func (ss *SelectiveStringsValue) Set(s string) error {
- vs := strings.Split(s, ",")
- for i := range vs {
- if _, ok := ss.valids[vs[i]]; ok {
- ss.vs = append(ss.vs, vs[i])
- } else {
- return fmt.Errorf("invalid value %q", vs[i])
- }
- }
- sort.Strings(ss.vs)
- return nil
- }
- // String returns the set value (if any) of the SelectiveStringsValue.
- func (ss *SelectiveStringsValue) String() string {
- return strings.Join(ss.vs, ",")
- }
- // Valids returns the list of valid strings.
- func (ss *SelectiveStringsValue) Valids() []string {
- s := make([]string, 0, len(ss.valids))
- for k := range ss.valids {
- s = append(s, k)
- }
- sort.Strings(s)
- return s
- }
- // NewSelectiveStringsValue creates a new string slice flag
- // for which any one of the given strings is a valid value,
- // and any other value is an error.
- func NewSelectiveStringsValue(valids ...string) *SelectiveStringsValue {
- vm := make(map[string]struct{})
- for _, v := range valids {
- vm[v] = struct{}{}
- }
- return &SelectiveStringsValue{valids: vm, vs: []string{}}
- }
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