47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
// Copyright 2015 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package flags
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import "errors"
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// NewStringsFlag creates a new string flag for which any one of the given
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// strings is a valid value, and any other value is an error.
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func NewStringsFlag(valids ...string) *StringsFlag {
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return &StringsFlag{Values: valids}
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}
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// StringsFlag implements the flag.Value interface.
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type StringsFlag struct {
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Values []string
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val string
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}
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// Set verifies the argument to be a valid member of the allowed values
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// before setting the underlying flag value.
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func (ss *StringsFlag) Set(s string) error {
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for _, v := range ss.Values {
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if s == v {
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ss.val = s
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return nil
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}
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}
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return errors.New("invalid value")
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}
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// String returns the set value (if any) of the StringsFlag
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func (ss *StringsFlag) String() string {
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return ss.val
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}
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