/
parts.go
87 lines (77 loc) · 2.57 KB
/
parts.go
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// Copyright Istio 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 yml
import (
"regexp"
"strings"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/yaml"
)
const (
joinSeparator = "\n---\n"
)
// Split where the '---' appears at the very beginning of a line. This will avoid
// accidentally splitting in cases where yaml resources contain nested yaml (which
// is indented).
var splitRegex = regexp.MustCompile(`(^|\n)---`)
// SplitYamlByKind splits the given YAML into parts indexed by kind.
func SplitYamlByKind(content string) map[string]string {
cfgs := SplitString(content)
result := map[string]string{}
for _, cfg := range cfgs {
var typeMeta metav1.TypeMeta
if e := yaml.Unmarshal([]byte(cfg), &typeMeta); e != nil {
// Ignore invalid parts. This most commonly happens when it's empty or contains only comments.
continue
}
result[typeMeta.Kind] = JoinString(result[typeMeta.Kind], cfg)
}
return result
}
// SplitYamlByKind splits the given YAML into parts indexed by kind.
func GetMetadata(content string) []metav1.ObjectMeta {
cfgs := SplitString(content)
result := []metav1.ObjectMeta{}
for _, cfg := range cfgs {
var m metav1.ObjectMeta
if e := yaml.Unmarshal([]byte(cfg), &m); e != nil {
// Ignore invalid parts. This most commonly happens when it's empty or contains only comments.
continue
}
result = append(result, m)
}
return result
}
// SplitString splits the given yaml doc if it's multipart document.
func SplitString(yamlText string) []string {
out := make([]string, 0)
parts := splitRegex.Split(yamlText, -1)
for _, part := range parts {
part := strings.TrimSpace(part)
if len(part) > 0 {
out = append(out, part)
}
}
return out
}
// JoinString joins the given yaml parts into a single multipart document.
func JoinString(parts ...string) string {
// Assume that each part is already a multi-document. Split and trim each part,
// if necessary.
toJoin := make([]string, 0, len(parts))
for _, part := range parts {
toJoin = append(toJoin, SplitString(part)...)
}
return strings.Join(toJoin, joinSeparator)
}