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