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// Package hcl implements a koanf.Parser that parses Hashicorp
// HCL bytes as conf maps.
package hcl
import (
"errors"
"github.com/hashicorp/hcl"
)
// HCL implements a Hashicorp HCL parser.
type HCL struct{ flattenSlices bool }
// Parser returns an HCL Parser.
// flattenSlices flattens HCL structures where maps turn into
// lists of maps. Read more here: https://github.com/hashicorp/hcl/issues/162
// It's recommended to turn this setting on.
func Parser(flattenSlices bool) *HCL {
return &HCL{flattenSlices: flattenSlices}
}
// Unmarshal parses the given HCL bytes.
func (p *HCL) Unmarshal(b []byte) (map[string]interface{}, error) {
o, err := hcl.Parse(string(b))
if err != nil {
return nil, err
}
var out map[string]interface{}
if err := hcl.DecodeObject(&out, o); err != nil {
return nil, err
}
if p.flattenSlices {
flattenHCL(out)
}
return out, nil
}
// Marshal marshals the given config map to HCL bytes.
func (p *HCL) Marshal(o map[string]interface{}) ([]byte, error) {
return nil, errors.New("HCL marshalling is not supported")
// TODO: Although this is the only way to do it, it's producing empty bytes.
// Needs investigation.
// The only way to generate HCL is from the HCL node structure.
// Turn the map into JSON, then parse it with the HCL lib to create its
// structure, and then, encode to HCL.
// j, err := json.Marshal(o)
// if err != nil {
// return nil, err
// }
// tree, err := hcl.Parse(string(j))
// if err != nil {
// return nil, err
// }
// var buf bytes.Buffer
// out := bufio.NewWriter(&buf)
// if err := printer.Fprint(out, tree.Node); err != nil {
// return nil, err
// }
// return buf.Bytes(), err
}
// flattenHCL flattens an unmarshalled HCL structure where maps
// turn into slices -- https://github.com/hashicorp/hcl/issues/162.
func flattenHCL(mp map[string]interface{}) {
for k, val := range mp {
if v, ok := val.([]map[string]interface{}); ok {
if len(v) == 1 {
mp[k] = v[0]
}
}
}
for _, val := range mp {
if v, ok := val.(map[string]interface{}); ok {
flattenHCL(v)
}
}
}
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