mirror of
https://github.com/gohugoio/hugo.git
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84 lines
2.4 KiB
Go
84 lines
2.4 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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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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//
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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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// The metadecoders package contains functions to decode metadata (e.g. page front matter)
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// from different formats: TOML, YAML, JSON.
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package metadecoders
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import (
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"fmt"
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"github.com/spf13/cast"
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yaml "gopkg.in/yaml.v2"
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)
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// HandleYAMLData unmarshals YAML-encoded datum and returns a Go interface
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// representing the encoded data structure.
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func HandleYAMLData(datum []byte) (interface{}, error) {
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var m interface{}
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err := yaml.Unmarshal(datum, &m)
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if err != nil {
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return nil, err
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}
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// To support boolean keys, the `yaml` package unmarshals maps to
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// map[interface{}]interface{}. Here we recurse through the result
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// and change all maps to map[string]interface{} like we would've
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// gotten from `json`.
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if mm, changed := stringifyMapKeys(m); changed {
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return mm, nil
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}
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return m, nil
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}
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// stringifyMapKeys recurses into in and changes all instances of
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// map[interface{}]interface{} to map[string]interface{}. This is useful to
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// work around the impedence mismatch between JSON and YAML unmarshaling that's
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// described here: https://github.com/go-yaml/yaml/issues/139
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//
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// Inspired by https://github.com/stripe/stripe-mock, MIT licensed
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func stringifyMapKeys(in interface{}) (interface{}, bool) {
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switch in := in.(type) {
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case []interface{}:
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for i, v := range in {
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if vv, replaced := stringifyMapKeys(v); replaced {
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in[i] = vv
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}
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}
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case map[interface{}]interface{}:
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res := make(map[string]interface{})
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var (
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ok bool
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err error
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)
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for k, v := range in {
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var ks string
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if ks, ok = k.(string); !ok {
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ks, err = cast.ToStringE(k)
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if err != nil {
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ks = fmt.Sprintf("%v", k)
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}
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}
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if vv, replaced := stringifyMapKeys(v); replaced {
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res[ks] = vv
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} else {
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res[ks] = v
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}
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}
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return res, true
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}
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return nil, false
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}
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