1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
|
// Copyright 2015 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 parser
// TODO(bep) archetype remove unused from this package.
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"strings"
"github.com/gohugoio/hugo/helpers"
"github.com/spf13/cast"
"github.com/BurntSushi/toml"
"github.com/chaseadamsio/goorgeous"
"gopkg.in/yaml.v2"
)
// FrontmatterType represents a type of frontmatter.
type FrontmatterType struct {
// Parse decodes content into a Go interface.
Parse func([]byte) (map[string]interface{}, error)
markstart, markend []byte // starting and ending delimiters
includeMark bool // include start and end mark in output
}
// InterfaceToConfig encodes a given input based upon the mark and writes to w.
func InterfaceToConfig(in interface{}, mark rune, w io.Writer) error {
if in == nil {
return errors.New("input was nil")
}
switch mark {
case rune(YAMLLead[0]):
b, err := yaml.Marshal(in)
if err != nil {
return err
}
_, err = w.Write(b)
return err
case rune(TOMLLead[0]):
return toml.NewEncoder(w).Encode(in)
case rune(JSONLead[0]):
b, err := json.MarshalIndent(in, "", " ")
if err != nil {
return err
}
_, err = w.Write(b)
if err != nil {
return err
}
_, err = w.Write([]byte{'\n'})
return err
default:
return errors.New("Unsupported Format provided")
}
}
// InterfaceToFrontMatter encodes a given input into a frontmatter
// representation based upon the mark with the appropriate front matter delimiters
// surrounding the output, which is written to w.
func InterfaceToFrontMatter(in interface{}, mark rune, w io.Writer) error {
if in == nil {
return errors.New("input was nil")
}
switch mark {
case rune(YAMLLead[0]):
_, err := w.Write([]byte(YAMLDelimUnix))
if err != nil {
return err
}
err = InterfaceToConfig(in, mark, w)
if err != nil {
return err
}
_, err = w.Write([]byte(YAMLDelimUnix))
return err
case rune(TOMLLead[0]):
_, err := w.Write([]byte(TOMLDelimUnix))
if err != nil {
return err
}
err = InterfaceToConfig(in, mark, w)
if err != nil {
return err
}
_, err = w.Write([]byte("\n" + TOMLDelimUnix))
return err
default:
return InterfaceToConfig(in, mark, w)
}
}
// FormatToLeadRune takes a given format kind and return the leading front
// matter delimiter.
func FormatToLeadRune(kind string) rune {
switch FormatSanitize(kind) {
case "yaml":
return rune([]byte(YAMLLead)[0])
case "json":
return rune([]byte(JSONLead)[0])
case "org":
return '#'
default:
return rune([]byte(TOMLLead)[0])
}
}
// FormatSanitize returns the canonical format name for a given kind.
//
// TODO(bep) move to helpers
func FormatSanitize(kind string) string {
switch strings.ToLower(kind) {
case "yaml", "yml":
return "yaml"
case "toml", "tml":
return "toml"
case "json", "js":
return "json"
case "org":
return kind
default:
return "toml"
}
}
// DetectFrontMatter detects the type of frontmatter analysing its first character.
func DetectFrontMatter(mark rune) (f *FrontmatterType) {
switch mark {
case '-':
return &FrontmatterType{HandleYAMLMetaData, []byte(YAMLDelim), []byte(YAMLDelim), false}
case '+':
return &FrontmatterType{HandleTOMLMetaData, []byte(TOMLDelim), []byte(TOMLDelim), false}
case '{':
return &FrontmatterType{HandleJSONMetaData, []byte{'{'}, []byte{'}'}, true}
case '#':
return &FrontmatterType{HandleOrgMetaData, []byte("#+"), []byte("\n"), false}
default:
return nil
}
}
// HandleTOMLMetaData unmarshals TOML-encoded datum and returns a Go interface
// representing the encoded data structure.
func HandleTOMLMetaData(datum []byte) (map[string]interface{}, error) {
m := map[string]interface{}{}
datum = removeTOMLIdentifier(datum)
_, err := toml.Decode(string(datum), &m)
return m, err
}
// removeTOMLIdentifier removes, if necessary, beginning and ending TOML
// frontmatter delimiters from a byte slice.
func removeTOMLIdentifier(datum []byte) []byte {
ld := len(datum)
if ld < 8 {
return datum
}
b := bytes.TrimPrefix(datum, []byte(TOMLDelim))
if ld-len(b) != 3 {
// No TOML prefix trimmed, so bail out
return datum
}
b = bytes.Trim(b, "\r\n")
return bytes.TrimSuffix(b, []byte(TOMLDelim))
}
// HandleYAMLMetaData unmarshals YAML-encoded datum and returns a Go interface
// representing the encoded data structure.
func HandleYAMLMetaData(datum []byte) (map[string]interface{}, error) {
m := map[string]interface{}{}
err := yaml.Unmarshal(datum, &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
}
}
}
return m, err
}
// HandleYAMLData unmarshals YAML-encoded datum and returns a Go interface
// representing the encoded data structure.
func HandleYAMLData(datum []byte) (interface{}, error) {
var m interface{}
err := yaml.Unmarshal(datum, &m)
if err != nil {
return
|