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// Copyright 2019 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 helpers implements general utility functions that work with
// and on content. The helper functions defined here lay down the
// foundation of how Hugo works with files and filepaths, and perform
// string operations on content.
package helpers
import (
"bytes"
"html/template"
"unicode"
"unicode/utf8"
"github.com/gohugoio/hugo/common/loggers"
"github.com/spf13/afero"
"github.com/gohugoio/hugo/markup/converter"
"github.com/gohugoio/hugo/markup"
bp "github.com/gohugoio/hugo/bufferpool"
"github.com/gohugoio/hugo/config"
"strings"
)
// SummaryDivider denotes where content summarization should end. The default is "<!--more-->".
var SummaryDivider = []byte("<!--more-->")
var (
openingPTag = []byte("<p>")
closingPTag = []byte("</p>")
paragraphIndicator = []byte("<p")
closingIndicator = []byte("</")
)
// ContentSpec provides functionality to render markdown content.
type ContentSpec struct {
Converters markup.ConverterProvider
MardownConverter converter.Converter // Markdown converter with no document context
anchorNameSanitizer converter.AnchorNameSanitizer
// SummaryLength is the length of the summary that Hugo extracts from a content.
summaryLength int
BuildFuture bool
BuildExpired bool
BuildDrafts bool
Cfg config.Provider
}
// NewContentSpec returns a ContentSpec initialized
// with the appropriate fields from the given config.Provider.
func NewContentSpec(cfg config.Provider, logger loggers.Logger, contentFs afero.Fs) (*ContentSpec, error) {
spec := &ContentSpec{
summaryLength: cfg.GetInt("summaryLength"),
BuildFuture: cfg.GetBool("buildFuture"),
BuildExpired: cfg.GetBool("buildExpired"),
BuildDrafts: cfg.GetBool("buildDrafts"),
Cfg: cfg,
}
converterProvider, err := markup.NewConverterProvider(converter.ProviderConfig{
Cfg: cfg,
ContentFs: contentFs,
Logger: logger,
})
if err != nil {
return nil, err
}
spec.Converters = converterProvider
p := converterProvider.Get("markdown")
conv, err := p.New(converter.DocumentContext{})
if err != nil {
return nil, err
}
spec.MardownConverter = conv
if as, ok := conv.(converter.AnchorNameSanitizer); ok {
spec.anchorNameSanitizer = as
} else {
// Use Goldmark's sanitizer
p := converterProvider.Get("goldmark")
conv, err := p.New(converter.DocumentContext{})
if err != nil {
return nil, err
}
spec.anchorNameSanitizer = conv.(converter.AnchorNameSanitizer)
}
return spec, nil
}
var stripHTMLReplacer = strings.NewReplacer("\n", " ", "</p>", "\n", "<br>", "\n", "<br />", "\n")
// StripHTML accepts a string, strips out all HTML tags and returns it.
func StripHTML(s string) string {
// Shortcut strings with no tags in them
if !strings.ContainsAny(s, "<>") {
return s
}
s = stripHTMLReplacer.Replace(s)
// Walk through the string removing all tags
b := bp.GetBuffer()
defer bp.PutBuffer(b)
var inTag, isSpace, wasSpace bool
for _, r := range s {
if !inTag {
isSpace = false
}
switch {
case r == '<':
inTag = true
case r == '>':
inTag = false
case unicode.IsSpace(r):
isSpace = true
fallthrough
default:
if !inTag && (!isSpace || (isSpace && !wasSpace)) {
b.WriteRune(r)
}
}
wasSpace = isSpace
}
return b.String()
}
// stripEmptyNav strips out empty <nav> tags from content.
func stripEmptyNav(in []byte) []byte {
return bytes.Replace(in, []byte("<nav>\n</nav>\n\n"), []byte(``), -1)
}
// BytesToHTML converts bytes to type template.HTML.
func BytesToHTML(b []byte) template.HTML {
return template.HTML(string(b))
}
// ExtractTOC extracts Table of Contents from content.
func ExtractTOC(content []byte) (newcontent []byte, toc []byte) {
if !bytes.Contains(content, []byte("<nav>")) {
return content, nil
}
origContent := make([]byte, len(content))
copy(origContent, content)
first := []byte(`<nav>
<ul>`)
last := []byte(`</ul>
</nav>`)
replacement := []byte(`<nav id="TableOfContents">
<ul>`)
startOfTOC := bytes.Index(content, first)
peekEnd := len(content)
if peekEnd > 70+startOfTOC {
peekEnd = 70 + startOfTOC
}
if startOfTOC < 0 {
return stripEmptyNav(content), toc
}
// Need to peek ahead to see if this nav element is actually the right one.
correctNav := bytes.Index(content[startOfTOC:peekEnd], []byte(`<li><a href="#`))
if correctNav < 0 { // no match found
return content, toc
}
lengthOfTOC := bytes.Index(content[startOfTOC:], last) + len(last)
endOfTOC := startOfTOC + lengthOfTOC
newcontent = append(content[:startOfTOC], content[endOfTOC:]...)
toc = append(replacement, origContent[startOfTOC+len(first):endOfTOC]...)
return
}
func (c *ContentSpec) RenderMarkdown(src []byte) ([]byte, error) {
b, err := c.MardownConverter.Convert(converter.RenderContext{Src: src})
if err != nil {
return nil, err
}
return b.Bytes(), nil
}
func (c *ContentSpec) SanitizeAnchorName(s string) string {
return c.anchorNameSanitizer.SanitizeAnchorName(s)
}
func (c *ContentSpec) ResolveMarkup(in string) string {
in = strings.ToLower(in)
switch in {
case "md", "markdown&q
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