photoprism/pkg/list/attributes.go

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package list
import (
"sort"
"strings"
)
// Attr represents a list of key-value attributes.
type Attr []*KeyValue
// ParseAttr parses a string into a new Attr since and returns it.
func ParseAttr(s string) Attr {
fields := strings.Fields(s)
result := make(Attr, 0, len(fields))
// Append an attribute for each field.
for _, v := range fields {
f := ParseKeyValue(v)
if f != nil {
result = append(result, f)
}
}
return result
}
// String returns the attributes as string.
func (list Attr) String() string {
result := make([]string, 0, len(list))
list.Sort()
var i int
var l int
for _, f := range list {
s := f.String()
if s == "" {
continue
} else if i == 0 {
// Skip check.
} else if result[i-1] == s {
continue
}
l += len(s)
if l > StringLengthLimit {
break
}
result = append(result, s)
i++
}
return strings.Join(result, " ")
}
// Sort sorts the attributes by key.
func (list Attr) Sort() {
sort.Slice(list, func(i, j int) bool {
if list[i].Key == list[j].Key {
return list[i].Value < list[j].Value
} else {
return list[i].Key < list[j].Key
}
})
}