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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// 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 metadecoders
import (
"encoding/json"
"github.com/BurntSushi/toml"
"github.com/chaseadamsio/goorgeous"
"github.com/gohugoio/hugo/parser/pageparser"
"github.com/pkg/errors"
yaml "gopkg.in/yaml.v2"
)
type Format string
const (
// These are the supported metdata formats in Hugo. Most of these are also
// supported as /data formats.
ORG Format = "org"
JSON Format = "json"
TOML Format = "toml"
YAML Format = "yaml"
)
// FormatFromFrontMatterType will return empty if not supported.
func FormatFromFrontMatterType(typ pageparser.ItemType) Format {
switch typ {
case pageparser.TypeFrontMatterJSON:
return JSON
case pageparser.TypeFrontMatterORG:
return ORG
case pageparser.TypeFrontMatterTOML:
return TOML
case pageparser.TypeFrontMatterYAML:
return YAML
default:
return ""
}
}
// UnmarshalToMap will unmarshall data in format f into a new map. This is
// what's needed for Hugo's front matter decoding.
func UnmarshalToMap(data []byte, f Format) (map[string]interface{}, error) {
m := make(map[string]interface{})
if data == nil {
return m, nil
}
var err error
switch f {
case ORG:
m, err = goorgeous.OrgHeaders(data)
case JSON:
err = json.Unmarshal(data, &m)
case TOML:
_, err = toml.Decode(string(data), &m)
case YAML:
err = yaml.Unmarshal(data, &m)
// To support boolean keys, the `yaml` package unmarshals maps to
// map[interface{}]interface{}. Here we recurse through the result
// and change all maps to map[string]interface{} like we would've
// gotten from `json`.
if err == nil {
for k, v := range m {
if vv, changed := stringifyMapKeys(v); changed {
m[k] = vv
}
}
}
default:
return nil, errors.Errorf("unmarshal of format %q is not supported", f)
}
if err != nil {
return nil, errors.Wrapf(err, "unmarshal failed for format %q", f)
}
return m, nil
}
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