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string.go
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/
string.go
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package sets
import (
"sort"
"strings"
)
type Empty struct{}
type StringSet map[string]Empty
func NewString(items ...string) StringSet {
s := make(StringSet)
s.Insert(items...)
return s
}
func (s StringSet) Insert(items ...string) {
for _, item := range items {
s[item] = Empty{}
}
}
func (s StringSet) Has(item string) bool {
_, contained := s[item]
return contained
}
func (s StringSet) List() []string {
if len(s) == 0 {
return nil
}
res := make([]string, 0, len(s))
for key := range s {
res = append(res, key)
}
sort.Strings(res)
return res
}
// Set implements flag.Value interface.
func (s *StringSet) Set(v string) error {
v = strings.TrimSpace(v)
if v == "" {
*s = nil
return nil
}
parts := strings.Split(v, ",")
set := NewString(parts...)
*s = set
return nil
}
// String implements flag.Value interface
func (s StringSet) String() string {
return strings.Join(s.List(), ",")
}