103 lines
3.6 KiB
Go
103 lines
3.6 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package flag
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import (
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"fmt"
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"sort"
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"strings"
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)
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// ColonSeparatedMultimapStringString supports setting a map[string][]string from an encoding
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// that separates keys from values with ':' and separates key-value pairs with ','.
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// A key can be repeated multiple times, in which case the values are appended to a
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// slice of strings associated with that key. Items in the list associated with a given
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// key will appear in the order provided.
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// For example: `a:hello,b:again,c:world,b:beautiful` results in `{"a": ["hello"], "b": ["again", "beautiful"], "c": ["world"]}`
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// The first call to Set will clear the map before adding entries; subsequent calls will simply append to the map.
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// This makes it possible to override default values with a command-line option rather than appending to defaults,
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// while still allowing the distribution of key-value pairs across multiple flag invocations.
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// For example: `--flag "a:hello" --flag "b:again" --flag "b:beautiful" --flag "c:world"` results in `{"a": ["hello"], "b": ["again", "beautiful"], "c": ["world"]}`
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type ColonSeparatedMultimapStringString struct {
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Multimap *map[string][]string
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initialized bool // set to true after the first Set call
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}
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// NewColonSeparatedMultimapStringString takes a pointer to a map[string][]string and returns the
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// ColonSeparatedMultimapStringString flag parsing shim for that map.
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func NewColonSeparatedMultimapStringString(m *map[string][]string) *ColonSeparatedMultimapStringString {
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return &ColonSeparatedMultimapStringString{Multimap: m}
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}
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// Set implements github.com/spf13/pflag.Value
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func (m *ColonSeparatedMultimapStringString) Set(value string) error {
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if m.Multimap == nil {
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return fmt.Errorf("no target (nil pointer to map[string][]string)")
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}
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if !m.initialized || *m.Multimap == nil {
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// clear default values, or allocate if no existing map
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*m.Multimap = make(map[string][]string)
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m.initialized = true
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}
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for _, pair := range strings.Split(value, ",") {
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if len(pair) == 0 {
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continue
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}
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kv := strings.SplitN(pair, ":", 2)
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if len(kv) != 2 {
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return fmt.Errorf("malformed pair, expect string:string")
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}
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k := strings.TrimSpace(kv[0])
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v := strings.TrimSpace(kv[1])
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(*m.Multimap)[k] = append((*m.Multimap)[k], v)
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}
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return nil
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}
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// String implements github.com/spf13/pflag.Value
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func (m *ColonSeparatedMultimapStringString) String() string {
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type kv struct {
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k string
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v string
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}
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kvs := make([]kv, 0, len(*m.Multimap))
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for k, vs := range *m.Multimap {
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for i := range vs {
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kvs = append(kvs, kv{k: k, v: vs[i]})
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}
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}
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// stable sort by keys, order of values should be preserved
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sort.SliceStable(kvs, func(i, j int) bool {
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return kvs[i].k < kvs[j].k
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})
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pairs := make([]string, 0, len(kvs))
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for i := range kvs {
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pairs = append(pairs, fmt.Sprintf("%s:%s", kvs[i].k, kvs[i].v))
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}
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return strings.Join(pairs, ",")
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}
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// Type implements github.com/spf13/pflag.Value
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func (m *ColonSeparatedMultimapStringString) Type() string {
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return "colonSeparatedMultimapStringString"
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}
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// Empty implements OmitEmpty
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func (m *ColonSeparatedMultimapStringString) Empty() bool {
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return len(*m.Multimap) == 0
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}
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