| // 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" |
| ) |
| |
| import ( |
| kubeApiMeta "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 kubeApiMeta.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) []kubeApiMeta.ObjectMeta { |
| cfgs := SplitString(content) |
| result := []kubeApiMeta.ObjectMeta{} |
| for _, cfg := range cfgs { |
| var m kubeApiMeta.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) |
| } |