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forgejo/modules/markup/markdown/goldmark.go

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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package markdown
import (
"bytes"
"fmt"
"regexp"
"strings"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/markup/common"
"code.gitea.io/gitea/modules/setting"
giteautil "code.gitea.io/gitea/modules/util"
meta "github.com/yuin/goldmark-meta"
"github.com/yuin/goldmark/ast"
east "github.com/yuin/goldmark/extension/ast"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/renderer/html"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
)
var byteMailto = []byte("mailto:")
// Header holds the data about a header.
type Header struct {
Level int
Text string
ID string
}
// ASTTransformer is a default transformer of the goldmark tree.
type ASTTransformer struct{}
// Transform transforms the given AST tree.
func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
metaData := meta.GetItems(pc)
firstChild := node.FirstChild()
createTOC := false
var toc = []Header{}
rc := &RenderConfig{
Meta: "table",
Icon: "table",
Lang: "",
}
if metaData != nil {
rc.ToRenderConfig(metaData)
metaNode := rc.toMetaNode(metaData)
if metaNode != nil {
node.InsertBefore(node, firstChild, metaNode)
}
createTOC = rc.TOC
toc = make([]Header, 0, 100)
}
_ = ast.Walk(node, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
if !entering {
return ast.WalkContinue, nil
}
switch v := n.(type) {
case *ast.Heading:
if createTOC {
text := n.Text(reader.Source())
header := Header{
Text: util.BytesToReadOnlyString(text),
Level: v.Level,
}
if id, found := v.AttributeString("id"); found {
header.ID = util.BytesToReadOnlyString(id.([]byte))
}
toc = append(toc, header)
}
case *ast.Image:
// Images need two things:
//
// 1. Their src needs to munged to be a real value
// 2. If they're not wrapped with a link they need a link wrapper
// Check if the destination is a real link
link := v.Destination
if len(link) > 0 && !markup.IsLink(link) {
prefix := pc.Get(urlPrefixKey).(string)
if pc.Get(isWikiKey).(bool) {
prefix = giteautil.URLJoin(prefix, "wiki", "raw")
}
prefix = strings.Replace(prefix, "/src/", "/media/", 1)
lnk := string(link)
lnk = giteautil.URLJoin(prefix, lnk)
link = []byte(lnk)
}
v.Destination = link
parent := n.Parent()
// Create a link around image only if parent is not already a link
if _, ok := parent.(*ast.Link); !ok && parent != nil {
wrap := ast.NewLink()
wrap.Destination = link
wrap.Title = v.Title
parent.ReplaceChild(parent, n, wrap)
wrap.AppendChild(wrap, n)
}
case *ast.Link:
// Links need their href to munged to be a real value
link := v.Destination
if len(link) > 0 && !markup.IsLink(link) &&
link[0] != '#' && !bytes.HasPrefix(link, byteMailto) {
// special case: this is not a link, a hash link or a mailto:, so it's a
// relative URL
lnk := string(link)
if pc.Get(isWikiKey).(bool) {
lnk = giteautil.URLJoin("wiki", lnk)
}
link = []byte(giteautil.URLJoin(pc.Get(urlPrefixKey).(string), lnk))
}
if len(link) > 0 && link[0] == '#' {
link = []byte("#user-content-" + string(link)[1:])
}
v.Destination = link
case *ast.List:
if v.HasChildren() && v.FirstChild().HasChildren() && v.FirstChild().FirstChild().HasChildren() {
if _, ok := v.FirstChild().FirstChild().FirstChild().(*east.TaskCheckBox); ok {
v.SetAttributeString("class", []byte("task-list"))
}
}
}
return ast.WalkContinue, nil
})
if createTOC && len(toc) > 0 {
lang := rc.Lang
if len(lang) == 0 {
lang = setting.Langs[0]
}
tocNode := createTOCNode(toc, lang)
if tocNode != nil {
node.InsertBefore(node, firstChild, tocNode)
}
}
if len(rc.Lang) > 0 {
node.SetAttributeString("lang", []byte(rc.Lang))
}
}
type prefixedIDs struct {
values map[string]bool
}
// Generate generates a new element id.
func (p *prefixedIDs) Generate(value []byte, kind ast.NodeKind) []byte {
dft := []byte("id")
if kind == ast.KindHeading {
dft = []byte("heading")
}
return p.GenerateWithDefault(value, dft)
}
// Generate generates a new element id.
func (p *prefixedIDs) GenerateWithDefault(value []byte, dft []byte) []byte {
result := common.CleanValue(value)
if len(result) == 0 {
result = dft
}
if !bytes.HasPrefix(result, []byte("user-content-")) {
result = append([]byte("user-content-"), result...)
}
if _, ok := p.values[util.BytesToReadOnlyString(result)]; !ok {
p.values[util.BytesToReadOnlyString(result)] = true
return result
}
for i := 1; ; i++ {
newResult := fmt.Sprintf("%s-%d", result, i)
if _, ok := p.values[newResult]; !ok {
p.values[newResult] = true
return []byte(newResult)
}
}
}
// Put puts a given element id to the used ids table.
func (p *prefixedIDs) Put(value []byte) {
p.values[util.BytesToReadOnlyString(value)] = true
}
func newPrefixedIDs() *prefixedIDs {
return &prefixedIDs{
values: map[string]bool{},
}
}
// NewHTMLRenderer creates a HTMLRenderer to render
// in the gitea form.
func NewHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
r := &HTMLRenderer{
Config: html.NewConfig(),
}
for _, opt := range opts {
opt.SetHTMLOption(&r.Config)
}
return r
}
// HTMLRenderer is a renderer.NodeRenderer implementation that
// renders gitea specific features.
type HTMLRenderer struct {
html.Config
}
// RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.
func (r *HTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
reg.Register(ast.KindDocument, r.renderDocument)
reg.Register(KindDetails, r.renderDetails)
reg.Register(KindSummary, r.renderSummary)
reg.Register(KindIcon, r.renderIcon)
reg.Register(east.KindTaskCheckBox, r.renderTaskCheckBox)
}
func (r *HTMLRenderer) renderDocument(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
log.Info("renderDocument %v", node)
n := node.(*ast.Document)
if val, has := n.AttributeString("lang"); has {
var err error
if entering {
_, err = w.WriteString("<div")
if err == nil {
_, err = w.WriteString(fmt.Sprintf(` lang=%q`, val))
}
if err == nil {
_, err = w.WriteRune('>')
}
} else {
_, err = w.WriteString("</div>")
}
if err != nil {
return ast.WalkStop, err
}
}
return ast.WalkContinue, nil
}
func (r *HTMLRenderer) renderDetails(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
var err error
if entering {
_, err = w.WriteString("<details>")
} else {
_, err = w.WriteString("</details>")
}
if err != nil {
return ast.WalkStop, err
}
return ast.WalkContinue, nil
}
func (r *HTMLRenderer) renderSummary(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
var err error
if entering {
_, err = w.WriteString("<summary>")
} else {
_, err = w.WriteString("</summary>")
}
if err != nil {
return ast.WalkStop, err
}
return ast.WalkContinue, nil
}
var validNameRE = regexp.MustCompile("^[a-z ]+$")
func (r *HTMLRenderer) renderIcon(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
if !entering {
return ast.WalkContinue, nil
}
n := node.(*Icon)
name := strings.TrimSpace(strings.ToLower(string(n.Name)))
if len(name) == 0 {
// skip this
return ast.WalkContinue, nil
}
if !validNameRE.MatchString(name) {
// skip this
return ast.WalkContinue, nil
}
var err error
_, err = w.WriteString(fmt.Sprintf(`<i class="icon %s"></i>`, name))
if err != nil {
return ast.WalkStop, err
}
return ast.WalkContinue, nil
}
func (r *HTMLRenderer) renderTaskCheckBox(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
if !entering {
return ast.WalkContinue, nil
}
n := node.(*east.TaskCheckBox)
end := ">"
if r.XHTML {
end = " />"
}
var err error
if n.IsChecked {
_, err = w.WriteString(`<span class="ui fitted disabled checkbox"><input type="checkbox" disabled="disabled"` + end + `<label` + end + `</span>`)
} else {
_, err = w.WriteString(`<span class="ui checked fitted disabled checkbox"><input type="checkbox" checked="" disabled="disabled"` + end + `<label` + end + `</span>`)
}
if err != nil {
return ast.WalkStop, err
}
return ast.WalkContinue, nil
}