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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"
"strings"
"unicode"
"github.com/gohugoio/hugo/common/hexec"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/media"
"github.com/spf13/afero"
"github.com/gohugoio/hugo/markup/converter"
"github.com/gohugoio/hugo/markup"
"github.com/gohugoio/hugo/config"
)
// ContentSpec provides functionality to render markdown content.
type ContentSpec struct {
Converters markup.ConverterProvider
anchorNameSanitizer converter.AnchorNameSanitizer
Cfg config.AllProvider
}
// NewContentSpec returns a ContentSpec initialized
// with the appropriate fields from the given config.Provider.
func NewContentSpec(cfg config.AllProvider, logger loggers.Logger, contentFs afero.Fs, ex *hexec.Exec) (*ContentSpec, error) {
spec := &ContentSpec{
Cfg: cfg,
}
converterProvider, err := markup.NewConverterProvider(converter.ProviderConfig{
Conf: cfg,
ContentFs: contentFs,
Logger: logger,
Exec: ex,
})
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
}
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
}
// 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) SanitizeAnchorName(s string) string {
return c.anchorNameSanitizer.SanitizeAnchorName(s)
}
func (c *ContentSpec) ResolveMarkup(in string) string {
in = strings.ToLower(in)
if mediaType, found := c.Cfg.ContentTypes().(media.ContentTypes).Types().GetBestMatch(markup.ResolveMarkup(in)); found {
return mediaType.SubType
}
if conv := c.Converters.Get(in); conv != nil {
return markup.ResolveMarkup(conv.Name())
}
return ""
}
// TotalWords counts instance of one or more consecutive white space
// characters, as defined by unicode.IsSpace, in s.
// This is a cheaper way of word counting than the obvious len(strings.Fields(s)).
func TotalWords(s string) int {
n := 0
inWord := false
for _, r := range s {
wasInWord := inWord
inWord = !unicode.IsSpace(r)
if inWord && !wasInWord {
n++
}
}
return n
}
// TrimShortHTML removes the outer tags from HTML input where (a) the opening
// tag is present only once with the input, and (b) the opening and closing
// tags wrap the input after white space removal.
func (c *ContentSpec) TrimShortHTML(input []byte, markup string) []byte {
openingTag := []byte("<p>")
closingTag := []byte("</p>")
if markup == media.DefaultContentTypes.AsciiDoc.SubType {
openingTag = []byte("<div class=\"paragraph\">\n<p>")
closingTag = []byte("</p>\n</div>")
}
if bytes.Count(input, openingTag) == 1 {
input = bytes.TrimSpace(input)
if bytes.HasPrefix(input, openingTag) && bytes.HasSuffix(input, closingTag) {
input = bytes.TrimPrefix(input, openingTag)
input = bytes.TrimSuffix(input, closingTag)
input = bytes.TrimSpace(input)
}
}
return input
}
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