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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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