gitea/vendor/github.com/niklasfasching/go-org/org/html_writer.go

507 lines
14 KiB
Go

package org
import (
"fmt"
"html"
"log"
"regexp"
"strings"
"unicode"
h "golang.org/x/net/html"
"golang.org/x/net/html/atom"
)
// HTMLWriter exports an org document into a html document.
type HTMLWriter struct {
ExtendingWriter Writer
HighlightCodeBlock func(source, lang string) string
strings.Builder
document *Document
htmlEscape bool
log *log.Logger
footnotes *footnotes
}
type footnotes struct {
mapping map[string]int
list []*FootnoteDefinition
}
var emphasisTags = map[string][]string{
"/": []string{"<em>", "</em>"},
"*": []string{"<strong>", "</strong>"},
"+": []string{"<del>", "</del>"},
"~": []string{"<code>", "</code>"},
"=": []string{`<code class="verbatim">`, "</code>"},
"_": []string{`<span style="text-decoration: underline;">`, "</span>"},
"_{}": []string{"<sub>", "</sub>"},
"^{}": []string{"<sup>", "</sup>"},
}
var listTags = map[string][]string{
"unordered": []string{"<ul>", "</ul>"},
"ordered": []string{"<ol>", "</ol>"},
"descriptive": []string{"<dl>", "</dl>"},
}
var listItemStatuses = map[string]string{
" ": "unchecked",
"-": "indeterminate",
"X": "checked",
}
var cleanHeadlineTitleForHTMLAnchorRegexp = regexp.MustCompile(`</?a[^>]*>`) // nested a tags are not valid HTML
func NewHTMLWriter() *HTMLWriter {
defaultConfig := New()
return &HTMLWriter{
document: &Document{Configuration: defaultConfig},
log: defaultConfig.Log,
htmlEscape: true,
HighlightCodeBlock: func(source, lang string) string {
return fmt.Sprintf("<div class=\"highlight\">\n<pre>\n%s\n</pre>\n</div>", html.EscapeString(source))
},
footnotes: &footnotes{
mapping: map[string]int{},
},
}
}
func (w *HTMLWriter) WriteNodesAsString(nodes ...Node) string {
original := w.Builder
w.Builder = strings.Builder{}
WriteNodes(w, nodes...)
out := w.String()
w.Builder = original
return out
}
func (w *HTMLWriter) WriterWithExtensions() Writer {
if w.ExtendingWriter != nil {
return w.ExtendingWriter
}
return w
}
func (w *HTMLWriter) Before(d *Document) {
w.document = d
w.log = d.Log
if title := d.Get("TITLE"); title != "" {
w.WriteString(fmt.Sprintf(`<h1 class="title">%s</h1>`+"\n", title))
}
w.WriteOutline(d)
}
func (w *HTMLWriter) After(d *Document) {
w.WriteFootnotes(d)
}
func (w *HTMLWriter) WriteComment(Comment) {}
func (w *HTMLWriter) WritePropertyDrawer(PropertyDrawer) {}
func (w *HTMLWriter) WriteBlock(b Block) {
content := ""
if isRawTextBlock(b.Name) {
builder, htmlEscape := w.Builder, w.htmlEscape
w.Builder, w.htmlEscape = strings.Builder{}, false
WriteNodes(w, b.Children...)
out := w.String()
w.Builder, w.htmlEscape = builder, htmlEscape
content = strings.TrimRightFunc(out, unicode.IsSpace)
} else {
content = w.WriteNodesAsString(b.Children...)
}
switch name := b.Name; {
case name == "SRC":
lang := "text"
if len(b.Parameters) >= 1 {
lang = strings.ToLower(b.Parameters[0])
}
content = w.HighlightCodeBlock(content, lang)
w.WriteString(fmt.Sprintf("<div class=\"src src-%s\">\n%s\n</div>\n", lang, content))
case name == "EXAMPLE":
w.WriteString(`<pre class="example">` + "\n" + content + "\n</pre>\n")
case name == "EXPORT" && len(b.Parameters) >= 1 && strings.ToLower(b.Parameters[0]) == "html":
w.WriteString(content + "\n")
case name == "QUOTE":
w.WriteString("<blockquote>\n" + content + "</blockquote>\n")
case name == "CENTER":
w.WriteString(`<div class="center-block" style="text-align: center; margin-left: auto; margin-right: auto;">` + "\n")
w.WriteString(content + "</div>\n")
default:
w.WriteString(fmt.Sprintf(`<div class="%s-block">`, strings.ToLower(b.Name)) + "\n")
w.WriteString(content + "</div>\n")
}
}
func (w *HTMLWriter) WriteDrawer(d Drawer) {
WriteNodes(w, d.Children...)
}
func (w *HTMLWriter) WriteKeyword(k Keyword) {
if k.Key == "HTML" {
w.WriteString(k.Value + "\n")
}
}
func (w *HTMLWriter) WriteInclude(i Include) {
WriteNodes(w, i.Resolve())
}
func (w *HTMLWriter) WriteFootnoteDefinition(f FootnoteDefinition) {
w.footnotes.updateDefinition(f)
}
func (w *HTMLWriter) WriteFootnotes(d *Document) {
if !w.document.GetOption("f") || len(w.footnotes.list) == 0 {
return
}
w.WriteString(`<div class="footnotes">` + "\n")
w.WriteString(`<hr class="footnotes-separatator">` + "\n")
w.WriteString(`<div class="footnote-definitions">` + "\n")
for i, definition := range w.footnotes.list {
id := i + 1
if definition == nil {
name := ""
for k, v := range w.footnotes.mapping {
if v == i {
name = k
}
}
w.log.Printf("Missing footnote definition for [fn:%s] (#%d)", name, id)
continue
}
w.WriteString(`<div class="footnote-definition">` + "\n")
w.WriteString(fmt.Sprintf(`<sup id="footnote-%d"><a href="#footnote-reference-%d">%d</a></sup>`, id, id, id) + "\n")
w.WriteString(`<div class="footnote-body">` + "\n")
WriteNodes(w, definition.Children...)
w.WriteString("</div>\n</div>\n")
}
w.WriteString("</div>\n</div>\n")
}
func (w *HTMLWriter) WriteOutline(d *Document) {
if w.document.GetOption("toc") && len(d.Outline.Children) != 0 {
w.WriteString("<nav>\n<ul>\n")
for _, section := range d.Outline.Children {
w.writeSection(section)
}
w.WriteString("</ul>\n</nav>\n")
}
}
func (w *HTMLWriter) writeSection(section *Section) {
// NOTE: To satisfy hugo ExtractTOC() check we cannot use `<li>\n` here. Doesn't really matter, just a note.
w.WriteString("<li>")
h := section.Headline
title := cleanHeadlineTitleForHTMLAnchorRegexp.ReplaceAllString(w.WriteNodesAsString(h.Title...), "")
w.WriteString(fmt.Sprintf("<a href=\"#%s\">%s</a>\n", h.ID(), title))
if len(section.Children) != 0 {
w.WriteString("<ul>\n")
for _, section := range section.Children {
w.writeSection(section)
}
w.WriteString("</ul>\n")
}
w.WriteString("</li>\n")
}
func (w *HTMLWriter) WriteHeadline(h Headline) {
for _, excludeTag := range strings.Fields(w.document.Get("EXCLUDE_TAGS")) {
for _, tag := range h.Tags {
if excludeTag == tag {
return
}
}
}
w.WriteString(fmt.Sprintf(`<h%d id="%s">`, h.Lvl+1, h.ID()) + "\n")
if w.document.GetOption("todo") && h.Status != "" {
w.WriteString(fmt.Sprintf(`<span class="todo">%s</span>`, h.Status) + "\n")
}
if w.document.GetOption("pri") && h.Priority != "" {
w.WriteString(fmt.Sprintf(`<span class="priority">[%s]</span>`, h.Priority) + "\n")
}
WriteNodes(w, h.Title...)
if w.document.GetOption("tags") && len(h.Tags) != 0 {
tags := make([]string, len(h.Tags))
for i, tag := range h.Tags {
tags[i] = fmt.Sprintf(`<span>%s</span>`, tag)
}
w.WriteString("&#xa0;&#xa0;&#xa0;")
w.WriteString(fmt.Sprintf(`<span class="tags">%s</span>`, strings.Join(tags, "&#xa0;")))
}
w.WriteString(fmt.Sprintf("\n</h%d>\n", h.Lvl+1))
WriteNodes(w, h.Children...)
}
func (w *HTMLWriter) WriteText(t Text) {
if !w.htmlEscape {
w.WriteString(t.Content)
} else if !w.document.GetOption("e") || t.IsRaw {
w.WriteString(html.EscapeString(t.Content))
} else {
w.WriteString(html.EscapeString(htmlEntityReplacer.Replace(t.Content)))
}
}
func (w *HTMLWriter) WriteEmphasis(e Emphasis) {
tags, ok := emphasisTags[e.Kind]
if !ok {
panic(fmt.Sprintf("bad emphasis %#v", e))
}
w.WriteString(tags[0])
WriteNodes(w, e.Content...)
w.WriteString(tags[1])
}
func (w *HTMLWriter) WriteLatexFragment(l LatexFragment) {
w.WriteString(l.OpeningPair)
WriteNodes(w, l.Content...)
w.WriteString(l.ClosingPair)
}
func (w *HTMLWriter) WriteStatisticToken(s StatisticToken) {
w.WriteString(fmt.Sprintf(`<code class="statistic">[%s]</code>`, s.Content))
}
func (w *HTMLWriter) WriteLineBreak(l LineBreak) {
w.WriteString(strings.Repeat("\n", l.Count))
}
func (w *HTMLWriter) WriteExplicitLineBreak(l ExplicitLineBreak) {
w.WriteString("<br>\n")
}
func (w *HTMLWriter) WriteFootnoteLink(l FootnoteLink) {
if !w.document.GetOption("f") {
return
}
i := w.footnotes.add(l)
id := i + 1
w.WriteString(fmt.Sprintf(`<sup class="footnote-reference"><a id="footnote-reference-%d" href="#footnote-%d">%d</a></sup>`, id, id, id))
}
func (w *HTMLWriter) WriteTimestamp(t Timestamp) {
if !w.document.GetOption("<") {
return
}
w.WriteString(`<span class="timestamp">&lt;`)
if t.IsDate {
w.WriteString(t.Time.Format(datestampFormat))
} else {
w.WriteString(t.Time.Format(timestampFormat))
}
if t.Interval != "" {
w.WriteString(" " + t.Interval)
}
w.WriteString(`&gt;</span>`)
}
func (w *HTMLWriter) WriteRegularLink(l RegularLink) {
url := html.EscapeString(l.URL)
if l.Protocol == "file" {
url = url[len("file:"):]
}
description := url
if l.Description != nil {
description = w.WriteNodesAsString(l.Description...)
}
switch l.Kind() {
case "image":
w.WriteString(fmt.Sprintf(`<img src="%s" alt="%s" title="%s" />`, url, description, description))
case "video":
w.WriteString(fmt.Sprintf(`<video src="%s" title="%s">%s</video>`, url, description, description))
default:
w.WriteString(fmt.Sprintf(`<a href="%s">%s</a>`, url, description))
}
}
func (w *HTMLWriter) WriteList(l List) {
tags, ok := listTags[l.Kind]
if !ok {
panic(fmt.Sprintf("bad list kind %#v", l))
}
w.WriteString(tags[0] + "\n")
WriteNodes(w, l.Items...)
w.WriteString(tags[1] + "\n")
}
func (w *HTMLWriter) WriteListItem(li ListItem) {
if li.Status != "" {
w.WriteString(fmt.Sprintf("<li class=\"%s\">\n", listItemStatuses[li.Status]))
} else {
w.WriteString("<li>\n")
}
WriteNodes(w, li.Children...)
w.WriteString("</li>\n")
}
func (w *HTMLWriter) WriteDescriptiveListItem(di DescriptiveListItem) {
if di.Status != "" {
w.WriteString(fmt.Sprintf("<dt class=\"%s\">\n", listItemStatuses[di.Status]))
} else {
w.WriteString("<dt>\n")
}
if len(di.Term) != 0 {
WriteNodes(w, di.Term...)
} else {
w.WriteString("?")
}
w.WriteString("\n</dt>\n")
w.WriteString("<dd>\n")
WriteNodes(w, di.Details...)
w.WriteString("</dd>\n")
}
func (w *HTMLWriter) WriteParagraph(p Paragraph) {
if len(p.Children) == 0 {
return
}
w.WriteString("<p>")
if _, ok := p.Children[0].(LineBreak); !ok {
w.WriteString("\n")
}
WriteNodes(w, p.Children...)
w.WriteString("\n</p>\n")
}
func (w *HTMLWriter) WriteExample(e Example) {
w.WriteString(`<pre class="example">` + "\n")
if len(e.Children) != 0 {
for _, n := range e.Children {
WriteNodes(w, n)
w.WriteString("\n")
}
}
w.WriteString("</pre>\n")
}
func (w *HTMLWriter) WriteHorizontalRule(h HorizontalRule) {
w.WriteString("<hr>\n")
}
func (w *HTMLWriter) WriteNodeWithMeta(n NodeWithMeta) {
out := w.WriteNodesAsString(n.Node)
if p, ok := n.Node.(Paragraph); ok {
if len(p.Children) == 1 && isImageOrVideoLink(p.Children[0]) {
out = w.WriteNodesAsString(p.Children[0])
}
}
for _, attributes := range n.Meta.HTMLAttributes {
out = w.withHTMLAttributes(out, attributes...) + "\n"
}
if len(n.Meta.Caption) != 0 {
caption := ""
for i, ns := range n.Meta.Caption {
if i != 0 {
caption += " "
}
caption += w.WriteNodesAsString(ns...)
}
out = fmt.Sprintf("<figure>\n%s<figcaption>\n%s\n</figcaption>\n</figure>\n", out, caption)
}
w.WriteString(out)
}
func (w *HTMLWriter) WriteNodeWithName(n NodeWithName) {
WriteNodes(w, n.Node)
}
func (w *HTMLWriter) WriteTable(t Table) {
w.WriteString("<table>\n")
beforeFirstContentRow := true
for i, row := range t.Rows {
if row.IsSpecial || len(row.Columns) == 0 {
continue
}
if beforeFirstContentRow {
beforeFirstContentRow = false
if i+1 < len(t.Rows) && len(t.Rows[i+1].Columns) == 0 {
w.WriteString("<thead>\n")
w.writeTableColumns(row.Columns, "th")
w.WriteString("</thead>\n<tbody>\n")
continue
} else {
w.WriteString("<tbody>\n")
}
}
w.writeTableColumns(row.Columns, "td")
}
w.WriteString("</tbody>\n</table>\n")
}
func (w *HTMLWriter) writeTableColumns(columns []Column, tag string) {
w.WriteString("<tr>\n")
for _, column := range columns {
if column.Align == "" {
w.WriteString(fmt.Sprintf("<%s>", tag))
} else {
w.WriteString(fmt.Sprintf(`<%s class="align-%s">`, tag, column.Align))
}
WriteNodes(w, column.Children...)
w.WriteString(fmt.Sprintf("</%s>\n", tag))
}
w.WriteString("</tr>\n")
}
func (w *HTMLWriter) withHTMLAttributes(input string, kvs ...string) string {
if len(kvs)%2 != 0 {
w.log.Printf("withHTMLAttributes: Len of kvs must be even: %#v", kvs)
return input
}
context := &h.Node{Type: h.ElementNode, Data: "body", DataAtom: atom.Body}
nodes, err := h.ParseFragment(strings.NewReader(strings.TrimSpace(input)), context)
if err != nil || len(nodes) != 1 {
w.log.Printf("withHTMLAttributes: Could not extend attributes of %s: %v (%s)", input, nodes, err)
return input
}
out, node := strings.Builder{}, nodes[0]
for i := 0; i < len(kvs)-1; i += 2 {
node.Attr = setHTMLAttribute(node.Attr, strings.TrimPrefix(kvs[i], ":"), kvs[i+1])
}
err = h.Render(&out, nodes[0])
if err != nil {
w.log.Printf("withHTMLAttributes: Could not extend attributes of %s: %v (%s)", input, node, err)
return input
}
return out.String()
}
func setHTMLAttribute(attributes []h.Attribute, k, v string) []h.Attribute {
for i, a := range attributes {
if strings.ToLower(a.Key) == strings.ToLower(k) {
switch strings.ToLower(k) {
case "class", "style":
attributes[i].Val += " " + v
default:
attributes[i].Val = v
}
return attributes
}
}
return append(attributes, h.Attribute{Namespace: "", Key: k, Val: v})
}
func (fs *footnotes) add(f FootnoteLink) int {
if i, ok := fs.mapping[f.Name]; ok && f.Name != "" {
return i
}
fs.list = append(fs.list, f.Definition)
i := len(fs.list) - 1
if f.Name != "" {
fs.mapping[f.Name] = i
}
return i
}
func (fs *footnotes) updateDefinition(f FootnoteDefinition) {
if i, ok := fs.mapping[f.Name]; ok {
fs.list[i] = &f
}
}