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package cli
import (
"encoding/json"
"fmt"
"reflect"
"sort"
"strings"
)
// MapBase wraps map[string]T to satisfy flag.Value
type MapBase[T any, C any, VC ValueCreator[T, C]] struct {
dict *map[string]T
hasBeenSet bool
value Value
}
func (i MapBase[T, C, VC]) Create(val map[string]T, p *map[string]T, c C) Value {
*p = map[string]T{}
for k, v := range val {
(*p)[k] = v
}
var t T
np := new(T)
var vc VC
return &MapBase[T, C, VC]{
dict: p,
value: vc.Create(t, np, c),
}
}
// NewMapBase makes a *MapBase with default values
func NewMapBase[T any, C any, VC ValueCreator[T, C]](defaults map[string]T) *MapBase[T, C, VC] {
return &MapBase[T, C, VC]{
dict: &defaults,
}
}
// Set parses the value and appends it to the list of values
func (i *MapBase[T, C, VC]) Set(value string) error {
if !i.hasBeenSet {
*i.dict = map[string]T{}
i.hasBeenSet = true
}
if strings.HasPrefix(value, slPfx) {
// Deserializing assumes overwrite
_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &i.dict)
i.hasBeenSet = true
return nil
}
for _, item := range flagSplitMultiValues(value) {
key, value, ok := strings.Cut(item, defaultMapFlagKeyValueSeparator)
if !ok {
return fmt.Errorf("item %q is missing separator %q", item, defaultMapFlagKeyValueSeparator)
}
if err := i.value.Set(value); err != nil {
return err
}
(*i.dict)[key] = i.value.Get().(T)
}
return nil
}
// String returns a readable representation of this value (for usage defaults)
func (i *MapBase[T, C, VC]) String() string {
v := i.Value()
var t T
if reflect.TypeOf(t).Kind() == reflect.String {
return fmt.Sprintf("%v", v)
}
return fmt.Sprintf("%T{%s}", v, i.ToString(v))
}
// Serialize allows MapBase to fulfill Serializer
func (i *MapBase[T, C, VC]) Serialize() string {
jsonBytes, _ := json.Marshal(i.dict)
return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
}
// Value returns the mapping of values set by this flag
func (i *MapBase[T, C, VC]) Value() map[string]T {
if i.dict == nil {
return map[string]T{}
}
return *i.dict
}
// Get returns the mapping of values set by this flag
func (i *MapBase[T, C, VC]) Get() interface{} {
return *i.dict
}
func (i MapBase[T, C, VC]) ToString(t map[string]T) string {
var defaultVals []string
var vc VC
for _, k := range sortedKeys(t) {
defaultVals = append(defaultVals, k+defaultMapFlagKeyValueSeparator+vc.ToString(t[k]))
}
return strings.Join(defaultVals, ", ")
}
func sortedKeys[T any](dict map[string]T) []string {
keys := make([]string, 0, len(dict))
for k := range dict {
keys = append(keys, k)
}
sort.Strings(keys)
return keys
}
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