mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-29 20:00:49 +00:00
297 lines
7.4 KiB
Go
297 lines
7.4 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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package metadecoders
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import (
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"bytes"
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"encoding/csv"
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"encoding/json"
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"fmt"
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"regexp"
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"strings"
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"github.com/gohugoio/hugo/common/herrors"
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"github.com/niklasfasching/go-org/org"
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"github.com/BurntSushi/toml"
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"github.com/pkg/errors"
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"github.com/spf13/afero"
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"github.com/spf13/cast"
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jww "github.com/spf13/jwalterweatherman"
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yaml "gopkg.in/yaml.v2"
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)
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// Decoder provides some configuration options for the decoders.
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type Decoder struct {
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// Delimiter is the field delimiter used in the CSV decoder. It defaults to ','.
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Delimiter rune
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// Comment, if not 0, is the comment character ued in the CSV decoder. Lines beginning with the
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// Comment character without preceding whitespace are ignored.
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Comment rune
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}
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// OptionsKey is used in cache keys.
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func (d Decoder) OptionsKey() string {
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var sb strings.Builder
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sb.WriteRune(d.Delimiter)
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sb.WriteRune(d.Comment)
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return sb.String()
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}
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// Default is a Decoder in its default configuration.
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var Default = Decoder{
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Delimiter: ',',
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}
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// UnmarshalToMap will unmarshall data in format f into a new map. This is
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// what's needed for Hugo's front matter decoding.
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func (d Decoder) UnmarshalToMap(data []byte, f Format) (map[string]interface{}, error) {
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m := make(map[string]interface{})
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if data == nil {
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return m, nil
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}
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err := d.UnmarshalTo(data, f, &m)
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return m, err
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}
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// UnmarshalFileToMap is the same as UnmarshalToMap, but reads the data from
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// the given filename.
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func (d Decoder) UnmarshalFileToMap(fs afero.Fs, filename string) (map[string]interface{}, error) {
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format := FormatFromString(filename)
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if format == "" {
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return nil, errors.Errorf("%q is not a valid configuration format", filename)
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}
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data, err := afero.ReadFile(fs, filename)
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if err != nil {
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return nil, err
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}
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return d.UnmarshalToMap(data, format)
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}
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// UnmarshalStringTo tries to unmarshal data to a new instance of type typ.
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func (d Decoder) UnmarshalStringTo(data string, typ interface{}) (interface{}, error) {
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data = strings.TrimSpace(data)
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// We only check for the possible types in YAML, JSON and TOML.
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switch typ.(type) {
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case string:
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return data, nil
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case map[string]interface{}:
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format := d.FormatFromContentString(data)
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return d.UnmarshalToMap([]byte(data), format)
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case []interface{}:
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// A standalone slice. Let YAML handle it.
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return d.Unmarshal([]byte(data), YAML)
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case bool:
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return cast.ToBoolE(data)
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case int:
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return cast.ToIntE(data)
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case int64:
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return cast.ToInt64E(data)
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case float64:
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return cast.ToFloat64E(data)
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default:
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return nil, errors.Errorf("unmarshal: %T not supportedd", typ)
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}
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}
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// Unmarshal will unmarshall data in format f into an interface{}.
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// This is what's needed for Hugo's /data handling.
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func (d Decoder) Unmarshal(data []byte, f Format) (interface{}, error) {
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if data == nil {
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switch f {
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case CSV:
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return make([][]string, 0), nil
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default:
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return make(map[string]interface{}), nil
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}
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}
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var v interface{}
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err := d.UnmarshalTo(data, f, &v)
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return v, err
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}
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// UnmarshalTo unmarshals data in format f into v.
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func (d Decoder) UnmarshalTo(data []byte, f Format, v interface{}) error {
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var err error
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switch f {
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case ORG:
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err = d.unmarshalORG(data, v)
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case JSON:
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err = json.Unmarshal(data, v)
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case TOML:
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err = toml.Unmarshal(data, v)
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case YAML:
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err = yaml.Unmarshal(data, v)
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if err != nil {
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return toFileError(f, errors.Wrap(err, "failed to unmarshal YAML"))
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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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var ptr interface{}
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switch v.(type) {
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case *map[string]interface{}:
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ptr = *v.(*map[string]interface{})
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case *interface{}:
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ptr = *v.(*interface{})
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default:
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// Not a map.
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}
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if ptr != nil {
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if mm, changed := stringifyMapKeys(ptr); changed {
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switch v.(type) {
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case *map[string]interface{}:
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*v.(*map[string]interface{}) = mm.(map[string]interface{})
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case *interface{}:
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*v.(*interface{}) = mm
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}
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}
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}
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case CSV:
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return d.unmarshalCSV(data, v)
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default:
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return errors.Errorf("unmarshal of format %q is not supported", f)
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}
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if err == nil {
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return nil
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}
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return toFileError(f, errors.Wrap(err, "unmarshal failed"))
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}
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func (d Decoder) unmarshalCSV(data []byte, v interface{}) error {
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r := csv.NewReader(bytes.NewReader(data))
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r.Comma = d.Delimiter
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r.Comment = d.Comment
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records, err := r.ReadAll()
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if err != nil {
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return err
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}
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switch v.(type) {
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case *interface{}:
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*v.(*interface{}) = records
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default:
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return errors.Errorf("CSV cannot be unmarshaled into %T", v)
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}
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return nil
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}
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func parseORGDate(s string) string {
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r := regexp.MustCompile(`[<\[](\d{4}-\d{2}-\d{2}) .*[>\]]`)
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if m := r.FindStringSubmatch(s); m != nil {
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return m[1]
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}
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return s
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}
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func (d Decoder) unmarshalORG(data []byte, v interface{}) error {
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config := org.New()
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config.Log = jww.WARN
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document := config.Parse(bytes.NewReader(data), "")
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if document.Error != nil {
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return document.Error
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}
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frontMatter := make(map[string]interface{}, len(document.BufferSettings))
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for k, v := range document.BufferSettings {
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k = strings.ToLower(k)
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if strings.HasSuffix(k, "[]") {
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frontMatter[k[:len(k)-2]] = strings.Fields(v)
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} else if k == "tags" || k == "categories" || k == "aliases" {
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jww.WARN.Printf("Please use '#+%s[]:' notation, automatic conversion is deprecated.", k)
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frontMatter[k] = strings.Fields(v)
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} else if k == "date" {
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frontMatter[k] = parseORGDate(v)
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} else {
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frontMatter[k] = v
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}
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}
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switch v.(type) {
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case *map[string]interface{}:
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*v.(*map[string]interface{}) = frontMatter
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default:
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*v.(*interface{}) = frontMatter
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}
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return nil
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}
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func toFileError(f Format, err error) error {
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return herrors.ToFileError(string(f), err)
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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 impedance 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[string]interface{}:
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for k, v := range in {
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if vv, changed := stringifyMapKeys(v); changed {
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in[k] = 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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