forked from profefe/profefe
/
labels.go
188 lines (156 loc) · 3.16 KB
/
labels.go
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package profile
import (
"bytes"
"io"
"net/url"
"sort"
"strings"
)
type Label struct {
Key string `json:"key"`
Value string `json:"value"`
}
type Labels []Label
func LabelsFromMap(m map[string]interface{}) Labels {
if len(m) == 0 {
return nil
}
labels := make(Labels, 0, len(m))
for k, rawVal := range m {
if k == "" {
continue
}
val, _ := rawVal.(string)
labels = append(labels, Label{k, val})
}
sort.Sort(labels)
return labels
}
func (labels Labels) Equal(labels2 Labels) bool {
if len(labels) != len(labels2) {
return false
}
labelsSet := make(map[string][]Label, len(labels))
for _, label := range labels {
labelsSet[label.Key] = append(labelsSet[label.Key], label)
}
for _, label := range labels2 {
v, ok := labelsSet[label.Key]
if !ok {
return false
}
ok = false
for _, label2 := range v {
if label.Value == label2.Value {
ok = true
break
}
}
if !ok {
return false
}
}
return true
}
// XXX(narqo): doesn't cover the case where Labels have multiple values of a key.
func (labels Labels) Include(labels2 Labels) bool {
if len(labels2) == 0 {
return true
}
if len(labels) == 0 {
return false
}
kvset := make(map[string]string, len(labels))
for _, label := range labels {
kvset[label.Key] = label.Value
}
for _, label := range labels2 {
v, ok := kvset[label.Key]
if !ok {
return false
}
if label.Value != v {
return false
}
}
return true
}
func (labels Labels) Add(labels2 Labels) Labels {
if labels == nil {
return labels2
} else if labels2 == nil {
return labels
}
labelsIdx := make(map[Label]struct{}, len(labels))
for _, label := range labels {
labelsIdx[label] = struct{}{}
}
ret := make([]Label, len(labels), len(labels)+len(labels2))
copy(ret, labels)
for _, label2 := range labels2 {
_, ok := labelsIdx[label2]
if !ok {
ret = append(ret, label2)
}
}
return ret
}
func (labels *Labels) FromString(s string) (err error) {
if s == "" {
return nil
}
var chunk string
for s != "" {
chunk, s = split2(s, ',')
key, val := split2(chunk, '=')
key, err = url.QueryUnescape(strings.TrimSpace(key))
if err != nil {
return err
}
if key == "" {
continue
}
val, err = url.QueryUnescape(strings.TrimSpace(val))
if err != nil {
return err
}
*labels = append(*labels, Label{key, val})
}
if len(*labels) != 0 {
sort.Sort(labels)
}
return nil
}
func split2(s string, ch byte) (s1, s2 string) {
for i := 0; i < len(s); i++ {
if s[i] == ch {
return s[:i], s[i+1:]
}
}
return s, ""
}
type LabelsEncoder interface {
io.ByteWriter
io.StringWriter
}
func (labels Labels) EncodeTo(w LabelsEncoder) {
for i, label := range labels {
if i != 0 {
w.WriteByte(',')
}
w.WriteString(label.Key)
w.WriteByte('=')
w.WriteString(label.Value)
}
}
func (labels Labels) String() string {
if labels == nil {
return ""
}
var buf bytes.Buffer
labels.EncodeTo(&buf)
return buf.String()
}
func (labels Labels) Len() int { return len(labels) }
func (labels Labels) Less(i, j int) bool { return labels[i].Key < labels[j].Key }
func (labels Labels) Swap(i, j int) { labels[i], labels[j] = labels[j], labels[i] }