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Apache License
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## hugo v0.49.2
The files in this directory are copied from the [hugo repository](https://github.com/gohugoio/hugo)
v0.49.2 and only slightly modified. The hugo license applies and is included.

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package hugov0492
import (
"bytes"
"encoding/json"
"fmt"
"github.com/BurntSushi/toml"
"github.com/spf13/cast"
"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
}
// 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}
default:
return nil
}
}
// 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
}
// 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))
}
// HandleJSONMetaData unmarshals JSON-encoded datum and returns a Go interface
// representing the encoded data structure.
func HandleJSONMetaData(datum []byte) (map[string]interface{}, error) {
m := make(map[string]interface{})
if datum == nil {
// Package json returns on error on nil input.
// Return an empty map to be consistent with our other supported
// formats.
return m, nil
}
err := json.Unmarshal(datum, &m)
return m, err
}
// stringifyMapKeys recurses into in and changes all instances of
// map[interface{}]interface{} to map[string]interface{}. This is useful to
// work around the impedence mismatch between JSON and YAML unmarshaling that's
// described here: https://github.com/go-yaml/yaml/issues/139
//
// Inspired by https://github.com/stripe/stripe-mock, MIT licensed
func stringifyMapKeys(in interface{}) (interface{}, bool) {
switch in := in.(type) {
case []interface{}:
for i, v := range in {
if vv, replaced := stringifyMapKeys(v); replaced {
in[i] = vv
}
}
case map[interface{}]interface{}:
res := make(map[string]interface{})
var (
ok bool
err error
)
for k, v := range in {
var ks string
if ks, ok = k.(string); !ok {
ks, err = cast.ToStringE(k)
if err != nil {
ks = fmt.Sprintf("%v", k)
}
}
if vv, replaced := stringifyMapKeys(v); replaced {
res[ks] = vv
} else {
res[ks] = v
}
}
return res, true
}
return nil, false
}

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// Copyright 2016n 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 hugov0492
import (
"bufio"
"bytes"
"fmt"
"io"
"regexp"
"strings"
"unicode"
)
const (
// TODO(bep) Do we really have to export these?
// HTMLLead identifies the start of HTML documents.
HTMLLead = "<"
// YAMLLead identifies the start of YAML frontmatter.
YAMLLead = "-"
// YAMLDelim identifies the YAML front matter delimiter.
YAMLDelim = "---"
// TOMLLead identifies the start of TOML front matter.
TOMLLead = "+"
// TOMLDelim identifies the TOML front matter delimiter.
TOMLDelim = "+++"
// JSONLead identifies the start of JSON frontmatter.
JSONLead = "{"
// HTMLCommentStart identifies the start of HTML comment.
HTMLCommentStart = "<!--"
// HTMLCommentEnd identifies the end of HTML comment.
HTMLCommentEnd = "-->"
// BOM Unicode byte order marker
BOM = '\ufeff'
)
var (
delims = regexp.MustCompile(
"^(" + regexp.QuoteMeta(YAMLDelim) + `\s*\n|` + regexp.QuoteMeta(TOMLDelim) + `\s*\n|` + regexp.QuoteMeta(JSONLead) + ")",
)
)
// Page represents a parsed content page.
type Page interface {
// FrontMatter contains the raw frontmatter with relevant delimiters.
FrontMatter() []byte
// Content contains the raw page content.
Content() []byte
// IsRenderable denotes that the page should be rendered.
IsRenderable() bool
// Metadata returns the unmarshalled frontmatter data.
Metadata() (map[string]interface{}, error)
}
// page implements the Page interface.
type page struct {
render bool
frontmatter []byte
content []byte
}
// Content returns the raw page content.
func (p *page) Content() []byte {
return p.content
}
// FrontMatter contains the raw frontmatter with relevant delimiters.
func (p *page) FrontMatter() []byte {
return p.frontmatter
}
// IsRenderable denotes that the page should be rendered.
func (p *page) IsRenderable() bool {
return p.render
}
// Metadata returns the unmarshalled frontmatter data.
func (p *page) Metadata() (meta map[string]interface{}, err error) {
frontmatter := p.FrontMatter()
if len(frontmatter) != 0 {
fm := DetectFrontMatter(rune(frontmatter[0]))
if fm != nil {
meta, err = fm.Parse(frontmatter)
}
}
return
}
// ReadFrom reads the content from an io.Reader and constructs a page.
func ReadFrom(r io.Reader) (p Page, err error) {
reader := bufio.NewReader(r)
// chomp BOM and assume UTF-8
if err = chompBOM(reader); err != nil && err != io.EOF {
return
}
if err = chompWhitespace(reader); err != nil && err != io.EOF {
return
}
if err = chompFrontmatterStartComment(reader); err != nil && err != io.EOF {
return
}
firstLine, err := peekLine(reader)
if err != nil && err != io.EOF {
return
}
newp := new(page)
newp.render = shouldRender(firstLine)
if newp.render && isFrontMatterDelim(firstLine) {
left, right := determineDelims(firstLine)
fm, err := extractFrontMatterDelims(reader, left, right)
if err != nil {
return nil, err
}
newp.frontmatter = fm
}
content, err := extractContent(reader)
if err != nil {
return nil, err
}
newp.content = content
return newp, nil
}
// chompBOM scans any leading Unicode Byte Order Markers from r.
func chompBOM(r io.RuneScanner) (err error) {
for {
c, _, err := r.ReadRune()
if err != nil {
return err
}
if c != BOM {
r.UnreadRune()
return nil
}
}
}
// chompWhitespace scans any leading Unicode whitespace from r.
func chompWhitespace(r io.RuneScanner) (err error) {
for {
c, _, err := r.ReadRune()
if err != nil {
return err
}
if !unicode.IsSpace(c) {
r.UnreadRune()
return nil
}
}
}
// chompFrontmatterStartComment checks r for a leading HTML comment. If a
// comment is found, it is read from r and then whitespace is trimmed from the
// beginning of r.
func chompFrontmatterStartComment(r *bufio.Reader) (err error) {
candidate, err := r.Peek(32)
if err != nil {
return err
}
str := string(candidate)
if strings.HasPrefix(str, HTMLCommentStart) {
lineEnd := strings.IndexAny(str, "\n")
if lineEnd == -1 {
//TODO: if we can't find it, Peek more?
return nil
}
testStr := strings.TrimSuffix(str[0:lineEnd], "\r")
if strings.Contains(testStr, HTMLCommentEnd) {
return nil
}
buf := make([]byte, lineEnd)
if _, err = r.Read(buf); err != nil {
return
}
if err = chompWhitespace(r); err != nil {
return err
}
}
return nil
}
// chompFrontmatterEndComment checks r for a trailing HTML comment.
func chompFrontmatterEndComment(r *bufio.Reader) (err error) {
candidate, err := r.Peek(32)
if err != nil {
return err
}
str := string(candidate)
lineEnd := strings.IndexAny(str, "\n")
if lineEnd == -1 {
return nil
}
testStr := strings.TrimSuffix(str[0:lineEnd], "\r")
if strings.Contains(testStr, HTMLCommentStart) {
return nil
}
//TODO: if we can't find it, Peek more?
if strings.HasSuffix(testStr, HTMLCommentEnd) {
buf := make([]byte, lineEnd)
if _, err = r.Read(buf); err != nil {
return
}
if err = chompWhitespace(r); err != nil {
return err
}
}
return nil
}
func peekLine(r *bufio.Reader) (line []byte, err error) {
firstFive, err := r.Peek(5)
if err != nil {
return
}
idx := bytes.IndexByte(firstFive, '\n')
if idx == -1 {
return firstFive, nil
}
idx++ // include newline.
return firstFive[:idx], nil
}
func shouldRender(lead []byte) (frontmatter bool) {
if len(lead) <= 0 {
return
}
if bytes.Equal(lead[:1], []byte(HTMLLead)) {
return
}
return true
}
func isFrontMatterDelim(data []byte) bool {
return delims.Match(data)
}
func determineDelims(firstLine []byte) (left, right []byte) {
switch firstLine[0] {
case YAMLLead[0]:
return []byte(YAMLDelim), []byte(YAMLDelim)
case TOMLLead[0]:
return []byte(TOMLDelim), []byte(TOMLDelim)
case JSONLead[0]:
return []byte(JSONLead), []byte("}")
default:
panic(fmt.Sprintf("Unable to determine delims from %q", firstLine))
}
}
// extractFrontMatterDelims takes a frontmatter from the content bufio.Reader.
// Beginning white spaces of the bufio.Reader must be trimmed before call this
// function.
func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, err error) {
var (
c byte
buf bytes.Buffer
level int
sameDelim = bytes.Equal(left, right)
inQuote bool
escapeState int
)
// Frontmatter must start with a delimiter. To check it first,
// pre-reads beginning delimiter length - 1 bytes from Reader
for i := 0; i < len(left)-1; i++ {
if c, err = r.ReadByte(); err != nil {
return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())
}
if err = buf.WriteByte(c); err != nil {
return nil, err
}
}
// Reads a character from Reader one by one and checks it matches the
// last character of one of delimiters to find the last character of
// frontmatter. If it matches, makes sure it contains the delimiter
// and if so, also checks it is followed by CR+LF or LF when YAML,
// TOML case. In JSON case, nested delimiters must be parsed and it
// is expected that the delimiter only contains one character.
for {
if c, err = r.ReadByte(); err != nil {
return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())
}
if err = buf.WriteByte(c); err != nil {
return nil, err
}
switch c {
case '"':
if escapeState != 1 {
inQuote = !inQuote
}
case '\\':
escapeState++
case left[len(left)-1]:
if sameDelim { // YAML, TOML case
if bytes.HasSuffix(buf.Bytes(), left) && (buf.Len() == len(left) || buf.Bytes()[buf.Len()-len(left)-1] == '\n') {
nextByte:
c, err = r.ReadByte()
if err != nil {
// It is ok that the end delimiter ends with EOF
if err != io.EOF || level != 1 {
return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())
}
} else {
switch c {
case '\n':
// ok
case ' ':
// Consume this byte and try to match again
goto nextByte
case '\r':
if err = buf.WriteByte(c); err != nil {
return nil, err
}
if c, err = r.ReadByte(); err != nil {
return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())
}
if c != '\n' {
return nil, fmt.Errorf("frontmatter delimiter must be followed by CR+LF or LF but those can't be found at filepos %d", buf.Len())
}
default:
return nil, fmt.Errorf("frontmatter delimiter must be followed by CR+LF or LF but those can't be found at filepos %d", buf.Len())
}
if err = buf.WriteByte(c); err != nil {
return nil, err
}
}
if level == 0 {
level = 1
} else {
level = 0
}
}
} else { // JSON case
if !inQuote {
level++
}
}
case right[len(right)-1]: // JSON case only reaches here
if !inQuote {
level--
}
}
if level == 0 {
// Consumes white spaces immediately behind frontmatter
if err = chompWhitespace(r); err != nil && err != io.EOF {
return nil, err
}
if err = chompFrontmatterEndComment(r); err != nil && err != io.EOF {
return nil, err
}
return buf.Bytes(), nil
}
if c != '\\' {
escapeState = 0
}
}
}
func extractContent(r io.Reader) (content []byte, err error) {
wr := new(bytes.Buffer)
if _, err = wr.ReadFrom(r); err != nil {
return
}
return wr.Bytes(), nil
}

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package hugov0492
import (
"fmt"
"net/url"
"regexp"
"strconv"
"strings"
"time"
)
type Content struct {
Title string
Slug string
Summary string
Categories []string
Tags []string
Date time.Time
Filepath string
Subdir string
Permalink string
}
func init() {
knownPermalinkAttributes = map[string]pageToPermaAttribute{
"year": pageToPermalinkDate,
"month": pageToPermalinkDate,
"monthname": pageToPermalinkDate,
"day": pageToPermalinkDate,
"weekday": pageToPermalinkDate,
"weekdayname": pageToPermalinkDate,
"yearday": pageToPermalinkDate,
"section": pageToPermalinkSection,
"title": pageToPermalinkTitle,
"slug": pageToPermalinkSlugElseTitle,
"filename": pageToPermalinkFilename,
}
attributeRegexp = regexp.MustCompile(`:\w+`)
}
// pageToPermaAttribute is the type of a function which, given a page and a tag
// can return a string to go in that position in the page (or an error)
type pageToPermaAttribute func(*Content, string) (string, error)
// PathPattern represents a string which builds up a URL from attributes
type PathPattern string
// knownPermalinkAttributes maps :tags in a permalink specification to a
// function which, given a page and the tag, returns the resulting string
// to be used to replace that tag.
var knownPermalinkAttributes map[string]pageToPermaAttribute
var attributeRegexp *regexp.Regexp
// validate determines if a PathPattern is well-formed
func (pp PathPattern) validate() bool {
fragments := strings.Split(string(pp[1:]), "/")
var bail = false
for i := range fragments {
if bail {
return false
}
if len(fragments[i]) == 0 {
bail = true
continue
}
matches := attributeRegexp.FindAllStringSubmatch(fragments[i], -1)
if matches == nil {
continue
}
for _, match := range matches {
k := strings.ToLower(match[0][1:])
if _, ok := knownPermalinkAttributes[k]; !ok {
return false
}
}
}
return true
}
// Expand on a PathPattern takes a Content and returns the fully expanded Permalink
// or an error explaining the failure.
func (pp PathPattern) Expand(p *Content) (string, error) {
if !pp.validate() {
return "", fmt.Errorf("error")
}
sections := strings.Split(string(pp), "/")
for i, field := range sections {
if len(field) == 0 {
continue
}
matches := attributeRegexp.FindAllStringSubmatch(field, -1)
if matches == nil {
continue
}
newField := field
for _, match := range matches {
attr := match[0][1:]
callback, ok := knownPermalinkAttributes[attr]
if !ok {
return "", fmt.Errorf("err2")
}
newAttr, err := callback(p, attr)
if err != nil {
return "", fmt.Errorf("err3 %w", err)
}
newField = strings.Replace(newField, match[0], newAttr, 1)
}
sections[i] = newField
}
return strings.Join(sections, "/"), nil
}
func pageToPermalinkDate(p *Content, dateField string) (string, error) {
// a Content contains a Node which provides a field Date, time.Time
switch dateField {
case "year":
return strconv.Itoa(p.Date.Year()), nil
case "month":
return fmt.Sprintf("%02d", int(p.Date.Month())), nil
case "monthname":
return p.Date.Month().String(), nil
case "day":
return fmt.Sprintf("%02d", p.Date.Day()), nil
case "weekday":
return strconv.Itoa(int(p.Date.Weekday())), nil
case "weekdayname":
return p.Date.Weekday().String(), nil
case "yearday":
return strconv.Itoa(p.Date.YearDay()), nil
}
//TODO: support classic strftime escapes too
// (and pass those through despite not being in the map)
panic("coding error: should not be here")
}
// if the page has a slug, return the slug, else return the title
func pageToPermalinkSlugElseTitle(p *Content, a string) (string, error) {
if p.Slug != "" {
// Don't start or end with a -
// TODO(bep) this doesn't look good... Set the Slug once.
if strings.HasPrefix(p.Slug, "-") {
p.Slug = p.Slug[1:len(p.Slug)]
}
if strings.HasSuffix(p.Slug, "-") {
p.Slug = p.Slug[0 : len(p.Slug)-1]
}
return URLEscape(p.Slug)
}
return pageToPermalinkTitle(p, a)
}
// pageToPermalinkFilename returns the URL-safe form of the filename
func pageToPermalinkFilename(p *Content, _ string) (string, error) {
return URLEscape(p.Filepath)
}
func pageToPermalinkTitle(p *Content, _ string) (string, error) {
return URLEscape(p.Title)
}
func pageToPermalinkSection(p *Content, _ string) (string, error) {
return URLEscape(p.Subdir)
}
func URLEscape(uri string) (string, error) {
parsedURI, err := url.Parse(uri)
if err != nil {
return "", err
}
return parsedURI.String(), nil
}