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/*
Copyright 2020 The Compose Specification Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package types
import (
"fmt"
"strings"
)
// Labels is a mapping type for labels
type Labels map[string]string
func NewLabelsFromMappingWithEquals(mapping MappingWithEquals) Labels {
labels := Labels{}
for k, v := range mapping {
if v != nil {
labels[k] = *v
}
}
return labels
}
func (l Labels) Add(key, value string) Labels {
if l == nil {
l = Labels{}
}
l[key] = value
return l
}
func (l Labels) AsList() []string {
s := make([]string, len(l))
i := 0
for k, v := range l {
s[i] = fmt.Sprintf("%s=%s", k, v)
i++
}
return s
}
func (l Labels) ToMappingWithEquals() MappingWithEquals {
mapping := MappingWithEquals{}
for k, v := range l {
v := v
mapping[k] = &v
}
return mapping
}
// label value can be a string | number | boolean | null (empty)
func labelValue(e interface{}) string {
if e == nil {
return ""
}
switch v := e.(type) {
case string:
return v
default:
return fmt.Sprint(v)
}
}
func (l *Labels) DecodeMapstructure(value interface{}) error {
switch v := value.(type) {
case map[string]interface{}:
labels := make(map[string]string, len(v))
for k, e := range v {
labels[k] = labelValue(e)
}
*l = labels
case []interface{}:
labels := make(map[string]string, len(v))
for _, s := range v {
k, e, _ := strings.Cut(fmt.Sprint(s), "=")
labels[k] = labelValue(e)
}
*l = labels
default:
return fmt.Errorf("unexpected value type %T for labels", value)
}
return nil
}
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