/
idlist.go
66 lines (59 loc) · 1.19 KB
/
idlist.go
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package gateboard
import (
"fmt"
"strconv"
"strings"
)
type idList struct {
list []idEntry
sum int
}
type idEntry struct {
id string
weight int
}
func newIDEntry(s string) (idEntry, error) {
id, weight, hasSep := strings.Cut(s, ";")
id = strings.TrimSpace(id)
if id == "" {
return idEntry{}, fmt.Errorf("invalid blank id")
}
if !hasSep {
return idEntry{id: id, weight: 1}, nil
}
weight = strings.TrimSpace(weight)
w, errConv := strconv.Atoi(weight)
if errConv != nil {
return idEntry{}, errConv
}
if w < 1 {
return idEntry{}, fmt.Errorf("invalid weight: %d", w)
}
return idEntry{id: id, weight: w}, nil
}
func (e idEntry) String() string {
if e.weight == 1 {
return e.id
}
return fmt.Sprintf("%s;%d", e.id, e.weight)
}
func newIDList(s string) (idList, error) {
list := strings.Split(s, ",")
var result idList
for _, i := range list {
e, err := newIDEntry(i)
if err != nil {
return result, err
}
result.list = append(result.list, e)
result.sum += e.weight
}
return result, nil
}
func (l idList) String() string {
list := make([]string, 0, len(l.list))
for _, e := range l.list {
list = append(list, e.String())
}
return strings.Join(list, ",")
}