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// 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"
"io"
"strings"
"github.com/gohugoio/hugo/parser/metadecoders"
"github.com/BurntSushi/toml"
"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")
}
}
func InterfaceToConfig2(in interface{}, format metadecoders.Format, w io.Writer) error {
if in == nil {
return errors.New("input was nil")
}
switch format {
case metadecoders.YAML:
b, err := yaml.Marshal(in)
if err != nil {
return err
}
_, err = w.Write(b)
return err
case metadecoders.TOML:
return toml.NewEncoder(w).Encode(in)
case metadecoders.JSON:
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")
}
}
func InterfaceToFrontMatter2(in interface{}, format metadecoders.Format, w io.Writer) error {
if in == nil {
return errors.New("input was nil")
}
switch format {
case metadecoders.YAML:
_, err := w.Write([]byte(YAMLDelimUnix))
if err != nil {
return err
}
err = InterfaceToConfig2(in, format, w)
if err != nil {
return err
}
_, err = w.Write([]byte(YAMLDelimUnix))
return err
case metadecoders.TOML:
_, err := w.Write([]byte(TOMLDelimUnix))
if err != nil {
return err
}
err = InterfaceToConfig2(in, format, w)
if err != nil {
return err
}
_, err = w.Write([]byte("\n" + TOMLDelimUnix))
return err
default:
return InterfaceToConfig2(in, format, w)
}
}
// 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"
}
}
// 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))
}
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