110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
// Licensed to Pulumi Corporation ("Pulumi") under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// Pulumi licenses this file to You under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package encoding
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import (
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"encoding/json"
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"path/filepath"
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"github.com/ghodss/yaml"
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)
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var JSONExt = ".json"
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var YAMLExt = ".yaml"
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// Exts contains a list of all the valid marshalable extension types.
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var Exts = []string{
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JSONExt,
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YAMLExt,
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// Although ".yml" is not a sanctioned YAML extension, it is used quite broadly; so we will support it.
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".yml",
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}
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// Detect auto-detects a marshaler for the given path.
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func Detect(path string) (Marshaler, string) {
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ext := filepath.Ext(path)
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if ext == "" {
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ext = DefaultExt() // default to the first (preferred) marshaler.
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}
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return Marshalers[ext], ext
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}
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// Marshalers is a map of extension to a Marshaler object for that extension.
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var Marshalers map[string]Marshaler
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// Default returns the default marshaler object.
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func Default() Marshaler {
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return Marshalers[DefaultExt()]
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}
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// DefaultExt returns the default extension to use.
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func DefaultExt() string {
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return Exts[0]
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}
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// Marshaler is a type that knows how to marshal and unmarshal data in one format.
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type Marshaler interface {
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IsJSONLike() bool
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IsYAMLLike() bool
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Marshal(v interface{}) ([]byte, error)
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Unmarshal(data []byte, v interface{}) error
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}
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var JSON Marshaler = &jsonMarshaler{}
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type jsonMarshaler struct {
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}
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func (m *jsonMarshaler) IsJSONLike() bool {
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return true
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}
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func (m *jsonMarshaler) IsYAMLLike() bool {
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return false
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}
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func (m *jsonMarshaler) Marshal(v interface{}) ([]byte, error) {
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return json.MarshalIndent(v, "", " ")
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}
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func (m *jsonMarshaler) Unmarshal(data []byte, v interface{}) error {
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// TODO: use a "strict" marshaler, so that we can warn on unrecognized keys (avoiding silly mistakes). We should
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// set aside an officially sanctioned area in the metadata for extensibility by 3rd parties.
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return json.Unmarshal(data, v)
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}
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var YAML Marshaler = &yamlMarshaler{}
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type yamlMarshaler struct {
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}
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func (m *yamlMarshaler) IsJSONLike() bool {
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return false
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}
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func (m *yamlMarshaler) IsYAMLLike() bool {
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return true
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}
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func (m *yamlMarshaler) Marshal(v interface{}) ([]byte, error) {
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return yaml.Marshal(v)
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}
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func (m *yamlMarshaler) Unmarshal(data []byte, v interface{}) error {
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// TODO: use a "strict" marshaler, so that we can warn on unrecognized keys (avoiding silly mistakes). We should
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// set aside an officially sanctioned area in the metadata for extensibility by 3rd parties.
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return yaml.Unmarshal(data, v)
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}
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