105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
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/*
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Copyright 2020 Docker Compose CLI authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package transform
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import (
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"fmt"
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"gopkg.in/yaml.v3"
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)
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// ReplaceExtendsFile changes value for service.extends.file in input yaml stream, preserving formatting
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func ReplaceExtendsFile(in []byte, service string, value string) ([]byte, error) {
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var doc yaml.Node
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err := yaml.Unmarshal(in, &doc)
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if err != nil {
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return nil, err
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}
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if doc.Kind != yaml.DocumentNode {
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return nil, fmt.Errorf("expected document kind %v, got %v", yaml.DocumentNode, doc.Kind)
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}
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root := doc.Content[0]
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if root.Kind != yaml.MappingNode {
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return nil, fmt.Errorf("expected document root to be a mapping, got %v", root.Kind)
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}
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services, err := getMapping(root, "services")
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if err != nil {
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return nil, err
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}
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target, err := getMapping(services, service)
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if err != nil {
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return nil, err
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}
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extends, err := getMapping(target, "extends")
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if err != nil {
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return nil, err
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}
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file, err := getMapping(extends, "file")
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if err != nil {
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return nil, err
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}
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// we've found target `file` yaml node. Let's replace value in stream at node position
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return replace(in, file.Line, file.Column, value), nil
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}
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func getMapping(root *yaml.Node, key string) (*yaml.Node, error) {
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var node *yaml.Node
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l := len(root.Content)
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for i := 0; i < l; i += 2 {
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k := root.Content[i]
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if k.Kind != yaml.ScalarNode || k.Tag != "!!str" {
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return nil, fmt.Errorf("expected mapping key to be a string, got %v %v", root.Kind, k.Tag)
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}
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if k.Value == key {
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node = root.Content[i+1]
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return node, nil
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}
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}
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return nil, fmt.Errorf("key %v not found", key)
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}
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// replace changes yaml node value in stream at position, preserving content
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func replace(in []byte, line int, column int, value string) []byte {
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var out []byte
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l := 1
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pos := 0
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for _, b := range in {
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if b == '\n' {
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l++
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if l == line {
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break
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}
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}
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pos++
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}
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pos += column
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out = append(out, in[0:pos]...)
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out = append(out, []byte(value)...)
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for ; pos < len(in); pos++ {
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if in[pos] == '\n' {
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break
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}
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}
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out = append(out, in[pos:]...)
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return out
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}
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