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h2m.go
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// Lute - 一款结构化的 Markdown 引擎，支持 Go 和 JavaScript
// Copyright (c) 2019-present, b3log.org
//
// Lute is licensed under Mulan PSL v2.
// You can use this software according to the terms and conditions of the Mulan PSL v2.
// You may obtain a copy of Mulan PSL v2 at:
// http://license.coscl.org.cn/MulanPSL2
// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
// See the Mulan PSL v2 for more details.
package lute
import (
"bytes"
"path"
"strings"
"unicode"
"github.com/88250/lute/ast"
"github.com/88250/lute/editor"
"github.com/88250/lute/html"
"github.com/88250/lute/html/atom"
"github.com/88250/lute/lex"
"github.com/88250/lute/parse"
"github.com/88250/lute/render"
"github.com/88250/lute/util"
)
// HTML2Markdown 将 HTML 转换为 Markdown。
func (lute *Lute) HTML2Markdown(htmlStr string) (markdown string, err error) {
//fmt.Println(htmlStr)
// 将字符串解析为 DOM 树
tree := lute.HTML2Tree(htmlStr)
// 将 AST 进行 Markdown 格式化渲染
var formatted []byte
renderer := render.NewFormatRenderer(tree, lute.RenderOptions)
for nodeType, rendererFunc := range lute.HTML2MdRendererFuncs {
renderer.ExtRendererFuncs[nodeType] = rendererFunc
}
formatted = renderer.Render()
markdown = util.BytesToStr(formatted)
return
}
// HTML2Tree 将 HTML 转换为 AST。
func (lute *Lute) HTML2Tree(dom string) (ret *parse.Tree) {
htmlRoot := lute.parseHTML(dom)
if nil == htmlRoot {
return
}
// 调整 DOM 结构
lute.adjustVditorDOM(htmlRoot)
// 将 HTML 树转换为 Markdown AST
ret = &parse.Tree{Name: "", Root: &ast.Node{Type: ast.NodeDocument}, Context: &parse.Context{ParseOption: lute.ParseOptions}}
ret.Context.Tip = ret.Root
for c := htmlRoot.FirstChild; nil != c; c = c.NextSibling {
lute.genASTByDOM(c, ret)
}
// 调整树结构
ast.Walk(ret.Root, func(n *ast.Node, entering bool) ast.WalkStatus {
if entering {
if ast.NodeList == n.Type {
// ul.ul => ul.li.ul
if nil != n.Parent && ast.NodeList == n.Parent.Type {
previousLi := n.Previous
if nil != previousLi {
n.Unlink()
previousLi.AppendChild(n)
}
}
}
}
return ast.WalkContinue
})
return
}
// genASTByDOM 根据指定的 DOM 节点 n 进行深度优先遍历并逐步生成 Markdown 语法树 tree。
func (lute *Lute) genASTByDOM(n *html.Node, tree *parse.Tree) {
if html.CommentNode == n.Type || atom.Meta == n.DataAtom {
return
}
if "svg" == n.Namespace {
return
}
dataRender := util.DomAttrValue(n, "data-render")
if "1" == dataRender {
return
}
class := util.DomAttrValue(n, "class")
if strings.HasPrefix(class, "line-number") &&
!strings.HasPrefix(class, "line-numbers" /* 简书代码块 https://github.com/siyuan-note/siyuan/issues/4361 */) {
return
}
if strings.Contains(class, "mw-editsection") {
// 忽略 Wikipedia [编辑] Do not clip the `Edit` element next to Wikipedia headings https://github.com/siyuan-note/siyuan/issues/11600
return
}
if strings.Contains(class, "citation-comment") {
// 忽略 Wikipedia 引用中的注释 https://github.com/siyuan-note/siyuan/issues/11640
return
}
if 0 == n.DataAtom && html.ElementNode == n.Type { // 自定义标签
for c := n.FirstChild; c != nil; c = c.NextSibling {
lute.genASTByDOM(c, tree)
}
return
}
node := &ast.Node{Type: ast.NodeText, Tokens: util.StrToBytes(n.Data)}
switch n.DataAtom {
case 0:
class := util.DomAttrValue(n.PrevSibling, "class")
if "fn__space5" == class {
// 链滴剪藏图片时多了长宽显示 https://github.com/siyuan-note/siyuan/issues/10987
return
}
if nil != n.Parent && atom.A == n.Parent.DataAtom {
node.Type = ast.NodeLinkText
}
// 将 \n空格空格* 转换为\n
for strings.Contains(string(node.Tokens), "\n ") {
node.Tokens = bytes.ReplaceAll(node.Tokens, []byte("\n "), []byte("\n "))
}
node.Tokens = bytes.ReplaceAll(node.Tokens, []byte("\n "), []byte("\n"))
node.Tokens = bytes.Trim(node.Tokens, "\t\n")
if lute.parentIs(n, atom.Table) {
if "\n" == n.Data {
if nil == tree.Context.Tip.FirstChild || nil == n.NextSibling {
break
}
tree.Context.Tip.AppendChild(&ast.Node{Type: ast.NodeBr})
break
} else {
if "" == strings.TrimSpace(n.Data) {
node.Tokens = []byte(" ")
tree.Context.Tip.AppendChild(node)
break
}
}
node.Tokens = bytes.TrimSpace(node.Tokens)
node.Tokens = bytes.ReplaceAll(node.Tokens, []byte("\n"), []byte(" "))
}
node.Tokens = bytes.ReplaceAll(node.Tokens, []byte{194, 160}, []byte{' '}) // 将 转换为空格
node.Tokens = bytes.ReplaceAll(node.Tokens, []byte("\n"), []byte{' '}) // 将 \n 转换为空格 https://github.com/siyuan-note/siyuan/issues/6052
if ast.NodeStrong == tree.Context.Tip.Type ||
ast.NodeEmphasis == tree.Context.Tip.Type ||
ast.NodeStrikethrough == tree.Context.Tip.Type ||
ast.NodeMark == tree.Context.Tip.Type ||
ast.NodeSup == tree.Context.Tip.Type ||
ast.NodeSub == tree.Context.Tip.Type {
if bytes.HasPrefix(node.Tokens, []byte(" ")) || 1 > len(bytes.TrimSpace(node.Tokens)) {
if nil != tree.Context.Tip.LastChild && tree.Context.Tip.LastChild.IsMarker() {
node.Tokens = append([]byte(editor.Zwsp), node.Tokens...)
}
}
if bytes.HasSuffix(node.Tokens, []byte(" ")) && nil == n.NextSibling {
node.Tokens = append(node.Tokens, []byte(editor.Zwsp)...)
}
}
if nil != n.Parent && atom.Span == n.Parent.DataAtom && 0 == len(n.Parent.Attr) {
// 按原文解析，不处理转义
} else {
if lute.ParseOptions.ProtyleWYSIWYG {
node.Tokens = lex.EscapeProtyleMarkers(node.Tokens)
} else {
node.Tokens = lex.EscapeCommonMarkers(node.Tokens)
if lute.parentIs(n, atom.Table) {
node.Tokens = bytes.ReplaceAll(node.Tokens, []byte("\\|"), []byte("|"))
node.Tokens = bytes.ReplaceAll(node.Tokens, []byte("|"), []byte("\\|"))
}
}
}
if 1 > len(node.Tokens) {
return
}
if ast.NodeListItem == tree.Context.Tip.Type {
p := &ast.Node{Type: ast.NodeParagraph}
p.AppendChild(node)
tree.Context.Tip.AppendChild(p)
tree.Context.Tip = p
} else {
tree.Context.Tip.AppendChild(node)
}
case atom.P, atom.Div, atom.Section, atom.Dd:
if ast.NodeLink == tree.Context.Tip.Type {
break
}
if lute.parentIs(n, atom.Table) {
if nil != n.PrevSibling && strings.Contains(n.PrevSibling.Data, "\n") {
break
}
if nil != n.NextSibling && strings.Contains(n.NextSibling.Data, "\n") {
break
}
if nil == tree.Context.Tip.FirstChild {
break
}
tree.Context.Tip.AppendChild(&ast.Node{Type: ast.NodeBr})
break
}
if ast.NodeHeading == tree.Context.Tip.Type {
// h 下存在 div/p/section 则忽略分块
break
}
class := util.DomAttrValue(n, "class")
if atom.Div == n.DataAtom || atom.Section == n.DataAtom {
// 解析 GitHub 语法高亮代码块
language := ""
if strings.Contains(class, "-source-") {
language = class[strings.LastIndex(class, "-source-")+len("-source-"):]
} else if strings.Contains(class, "-text-html-basic") {
language = "html"
}
if "" != language {
node.Type = ast.NodeCodeBlock
node.IsFencedCodeBlock = true
node.AppendChild(&ast.Node{Type: ast.NodeCodeBlockFenceOpenMarker, Tokens: util.StrToBytes("```"), CodeBlockFenceLen: 3})
node.AppendChild(&ast.Node{Type: ast.NodeCodeBlockFenceInfoMarker})
buf := &bytes.Buffer{}
node.LastChild.CodeBlockInfo = []byte(language)
buf.WriteString(util.DomText(n))
tokens := buf.Bytes()
tokens = bytes.ReplaceAll(tokens, []byte("\u00A0"), []byte(" "))
tokens = bytes.TrimSuffix(tokens, []byte("\n"+editor.Zwsp))
content := &ast.Node{Type: ast.NodeCodeBlockCode, Tokens: tokens}
node.AppendChild(content)
node.AppendChild(&ast.Node{Type: ast.NodeCodeBlockFenceCloseMarker, Tokens: util.StrToBytes("```"), CodeBlockFenceLen: 3})
tree.Context.Tip.AppendChild(node)
return
}
// The browser extension supports CSDN formula https://github.com/siyuan-note/siyuan/issues/5624
if strings.Contains(class, "MathJax") && nil != n.NextSibling && atom.Script == n.NextSibling.DataAtom && strings.Contains(util.DomAttrValue(n.NextSibling, "type"), "math/tex") {
tex := util.DomText(n.NextSibling)
appendMathBlock(tree, tex)
n.NextSibling.Unlink()
return
}
// The browser extension supports Wikipedia formula clipping https://github.com/siyuan-note/siyuan/issues/11583
if tex := strings.TrimSpace(util.DomAttrValue(n, "data-tex")); "" != tex {
appendMathBlock(tree, tex)
return
}
}
if strings.Contains(strings.ToLower(class), "mathjax") {
return
}
if "" == strings.TrimSpace(util.DomText(n)) {
for { // 这里用 for 是为了简化实现
if util.DomExistChildByType(n, atom.Img, atom.Picture, atom.Annotation, atom.Iframe, atom.Video, atom.Audio, atom.Source, atom.Canvas, atom.Svg, atom.Math) {
break
}
// span 可能是 TextMark 元素，也可能是公式，其他情况则忽略
spans := util.DomChildrenByType(n, atom.Span)
if 0 < len(spans) {
span := spans[0]
if "" != util.DomAttrValue(span, "data-type") || "" != util.DomAttrValue(span, "data-tex") {
break
}
}
return
}
}
node.Type = ast.NodeParagraph
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.H1, atom.H2, atom.H3, atom.H4, atom.H5, atom.H6:
if ast.NodeLink == tree.Context.Tip.Type {
break
}
node.Type = ast.NodeHeading
node.HeadingLevel = int(node.Tokens[1] - byte('0'))
node.AppendChild(&ast.Node{Type: ast.NodeHeadingC8hMarker, Tokens: util.StrToBytes(strings.Repeat("#", node.HeadingLevel))})
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Hr:
node.Type = ast.NodeThematicBreak
tree.Context.Tip.AppendChild(node)
case atom.Blockquote:
node.Type = ast.NodeBlockquote
node.AppendChild(&ast.Node{Type: ast.NodeBlockquoteMarker, Tokens: util.StrToBytes(">")})
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Ol, atom.Ul:
node.Type = ast.NodeList
node.ListData = &ast.ListData{}
if atom.Ol == n.DataAtom {
node.ListData.Typ = 1
}
node.ListData.Tight = true
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Li:
node.Type = ast.NodeListItem
marker := util.DomAttrValue(n, "data-marker")
var bullet byte
if "" == marker {
if nil != n.Parent && atom.Ol == n.Parent.DataAtom {
start := util.DomAttrValue(n.Parent, "start")
if "" == start {
marker = "1."
} else {
marker = start + "."
}
} else {
marker = "*"
bullet = marker[0]
}
} else {
if nil != n.Parent && "1." != marker && atom.Ol == n.Parent.DataAtom && nil != n.Parent.Parent && (atom.Ol == n.Parent.Parent.DataAtom || atom.Ul == n.Parent.Parent.DataAtom) {
// 子有序列表必须从 1 开始
marker = "1."
}
}
node.ListData = &ast.ListData{Marker: []byte(marker), BulletChar: bullet}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Pre:
firstc := n.FirstChild
if nil == firstc {
return
}
codes := util.DomChildrenByType(n, atom.Code)
if 0 < len(codes) {
// 删除第一个 code 之前的标签
unlinks := []*html.Node{}
for prev := codes[0].PrevSibling; nil != prev; prev = prev.PrevSibling {
unlinks = append(unlinks, prev)
}
for _, unlink := range unlinks {
unlink.Unlink()
}
firstc = n.FirstChild
if nil == firstc {
return
}
}
if atom.Em == firstc.DataAtom && nil != firstc.NextSibling && atom.Em == firstc.NextSibling.DataAtom {
// pre.em,em,code 的情况，这两个 em 是“复制代码”和“隐藏代码” https://github.com/siyuan-note/siyuan/issues/13026
if 0 < len(codes) {
firstc = codes[0]
if nil != firstc {
unlinks := []*html.Node{}
for prev := firstc.PrevSibling; nil != prev; prev = prev.PrevSibling {
unlinks = append(unlinks, prev)
}
for _, unlink := range unlinks {
unlink.Unlink()
}
}
}
}
if atom.Div == firstc.DataAtom && nil == firstc.NextSibling {
if 1 == len(codes) {
code := codes[0]
// pre 下只有一个 div，且 div 下只有一个 code，那么将 pre.div 替换为 pre.code https://github.com/siyuan-note/siyuan/issues/11131
code.Unlink()
n.AppendChild(code)
firstc.Unlink()
firstc = n.FirstChild
}
}
// 改进两种 pre.ol.li 的代码块解析 https://github.com/siyuan-note/siyuan/issues/11296
// 第一种：将 pre.ol.li.p.span, span, ... span 转换为 pre.ol.li.p.code, code, ... code，然后交由第二种处理
span2Code := false
if atom.Ol == firstc.DataAtom && nil == firstc.NextSibling && nil != firstc.FirstChild && atom.Li == firstc.FirstChild.DataAtom &&
nil != firstc.FirstChild.FirstChild && atom.P == firstc.FirstChild.FirstChild.DataAtom &&
nil != firstc.FirstChild.FirstChild.FirstChild && (atom.Span == firstc.FirstChild.FirstChild.FirstChild.DataAtom || html.TextNode == firstc.FirstChild.FirstChild.FirstChild.Type) {
for li := firstc.FirstChild; nil != li; li = li.NextSibling {
code := &html.Node{Data: "code", DataAtom: atom.Code, Type: html.ElementNode}
var spans []*html.Node
if nil == li.FirstChild {
continue
}
for span := li.FirstChild.FirstChild; nil != span; span = span.NextSibling {
spans = append(spans, span)
}
for _, span := range spans {
span.Unlink()
code.AppendChild(span)
}
li.FirstChild.AppendChild(code)
span2Code = true
}
}
// 第二种：将 pre.ol.li.p.code, code, ... code 转换为 pre.code, code, ... code，然后交由后续处理
if atom.Ol == firstc.DataAtom && nil == firstc.NextSibling && nil != firstc.FirstChild && atom.Li == firstc.FirstChild.DataAtom &&
nil != firstc.FirstChild.FirstChild && atom.P == firstc.FirstChild.FirstChild.DataAtom &&
nil != firstc.FirstChild.FirstChild.FirstChild && atom.Code == firstc.FirstChild.FirstChild.FirstChild.DataAtom {
var lis, codes []*html.Node
for li := firstc.FirstChild; nil != li; li = li.NextSibling {
lis = append(lis, li)
if nil == li.FirstChild {
continue
}
codes = append(codes, li.FirstChild.FirstChild)
}
for _, li := range lis {
li.Unlink()
}
for _, code := range codes {
code.Unlink()
n.AppendChild(code)
}
firstc.Unlink()
firstc = n.FirstChild
}
if html.TextNode == firstc.Type || atom.Span == firstc.DataAtom || atom.Code == firstc.DataAtom || atom.Section == firstc.DataAtom || atom.Pre == firstc.DataAtom || atom.A == firstc.DataAtom || atom.P == firstc.DataAtom {
node.Type = ast.NodeCodeBlock
node.IsFencedCodeBlock = true
node.AppendChild(&ast.Node{Type: ast.NodeCodeBlockFenceOpenMarker, Tokens: util.StrToBytes("```"), CodeBlockFenceLen: 3})
node.AppendChild(&ast.Node{Type: ast.NodeCodeBlockFenceInfoMarker})
if atom.Code == firstc.DataAtom || atom.Span == firstc.DataAtom || atom.A == firstc.DataAtom {
class := util.DomAttrValue(firstc, "class")
if nil != n.Parent && nil != n.Parent.Parent {
parentClass := util.DomAttrValue(n.Parent.Parent, "class")
if strings.Contains(parentClass, "language-") {
class = parentClass
}
}
if !strings.Contains(class, "language-") {
class = util.DomAttrValue(n, "class")
}
if strings.Contains(class, "language-") {
language := class[strings.Index(class, "language-")+len("language-"):]
language = strings.Split(language, " ")[0]
if "fallback" != language && "chroma" != language {
node.LastChild.CodeBlockInfo = []byte(language)
}
} else {
if atom.Code == firstc.DataAtom && !span2Code {
class := util.DomAttrValue(firstc, "class")
if !strings.Contains(class, " ") {
node.LastChild.CodeBlockInfo = []byte(class)
}
}
}
if 1 > len(node.LastChild.CodeBlockInfo) {
class := util.DomAttrValue(n, "class")
if !strings.Contains(class, " ") && "fallback" != class && "chroma" != class {
node.LastChild.CodeBlockInfo = []byte(class)
}
}
if 1 > len(node.LastChild.CodeBlockInfo) {
lang := util.DomAttrValue(n, "data-language")
if !strings.Contains(lang, " ") {
node.LastChild.CodeBlockInfo = []byte(lang)
}
}
if bytes.ContainsAny(node.LastChild.CodeBlockInfo, "-_ ") {
node.LastChild.CodeBlockInfo = nil
}
}
if atom.Code == firstc.DataAtom {
if nil != firstc.NextSibling && atom.Code == firstc.NextSibling.DataAtom {
// pre.code code 每个 code 为一行的结构，需要在 code 中间插入换行
for c := firstc.NextSibling; nil != c; c = c.NextSibling {
c.InsertBefore(&html.Node{DataAtom: atom.Br})
}
}
if nil != firstc.FirstChild && atom.Ol == firstc.FirstChild.DataAtom {
// CSDN 代码块：pre.code.ol.li
for li := firstc.FirstChild.FirstChild; nil != li; li = li.NextSibling {
if li != firstc.FirstChild.FirstChild {
li.InsertBefore(&html.Node{DataAtom: atom.Br})
}
}
}
if nil != n.LastChild && atom.Ul == n.LastChild.DataAtom {
// CSDN 代码块：pre.code,ul
n.LastChild.Unlink() // 去掉最后一个代码行号子块 https://github.com/siyuan-note/siyuan/issues/5564
}
}
if atom.Pre == firstc.DataAtom && nil != firstc.FirstChild {
// pre.code code 每个 code 为一行的结构，需要在 code 中间插入换行
for c := firstc.FirstChild.NextSibling; nil != c; c = c.NextSibling {
c.InsertBefore(&html.Node{DataAtom: atom.Br})
}
}
if atom.P == firstc.DataAtom {
// 避免下面 util.DomText 把 p 转换为两个换行
firstc.DataAtom = atom.Div
}
buf := &bytes.Buffer{}
buf.WriteString(util.DomText(n))
tokens := buf.Bytes()
tokens = bytes.ReplaceAll(tokens, []byte("\u00A0"), []byte(" "))
tokens = bytes.TrimSuffix(tokens, []byte("\n"+editor.Zwsp))
content := &ast.Node{Type: ast.NodeCodeBlockCode, Tokens: tokens}
node.AppendChild(content)
node.AppendChild(&ast.Node{Type: ast.NodeCodeBlockFenceCloseMarker, Tokens: util.StrToBytes("```"), CodeBlockFenceLen: 3})
if tree.Context.Tip.ParentIs(ast.NodeTable) {
// 如果表格中只有一行一列，那么丢弃表格直接使用代码块
// Improve HTML parsing code blocks https://github.com/siyuan-note/siyuan/issues/11068
for table := tree.Context.Tip.Parent; nil != table; table = table.Parent {
if ast.NodeTable == table.Type {
if nil != table.FirstChild && table.FirstChild == table.LastChild && ast.NodeTableHead == table.FirstChild.Type &&
table.FirstChild.FirstChild == table.FirstChild.LastChild &&
nil != table.FirstChild.FirstChild.FirstChild && ast.NodeTableCell == table.FirstChild.FirstChild.FirstChild.Type {
table.InsertBefore(node)
table.Unlink()
tree.Context.Tip = node
parent := n.Parent
for i := 0; i < 32; i++ {
if nil == parent {
break
}
class := util.DomAttrValue(parent, "class")
if strings.Contains(class, "language-") {
node.ChildByType(ast.NodeCodeBlockFenceInfoMarker).CodeBlockInfo = []byte(class[strings.Index(class, "language-")+len("language-"):])
break
} else if strings.Contains(class, "highlight ") {
node.ChildByType(ast.NodeCodeBlockFenceInfoMarker).CodeBlockInfo = []byte(class[strings.Index(class, "highlight ")+len("highlight "):])
break
}
parent = parent.Parent
}
return
}
}
}
// 表格中不支持添加块级元素，所以这里只能将其转换为多个行级代码元素
lines := bytes.Split(content.Tokens, []byte("\n"))
for i, line := range lines {
if 0 < len(line) {
code := &ast.Node{Type: ast.NodeCodeSpan}
if bytes.Contains(line, []byte("`")) {
node.CodeMarkerLen = 2
}
code.AppendChild(&ast.Node{Type: ast.NodeCodeSpanOpenMarker, Tokens: []byte("`")})
code.AppendChild(&ast.Node{Type: ast.NodeCodeSpanContent, Tokens: line})
code.AppendChild(&ast.Node{Type: ast.NodeCodeSpanCloseMarker, Tokens: []byte("`")})
tree.Context.Tip.AppendChild(code)
if i < len(lines)-1 {
if tree.Context.ParseOption.ProtyleWYSIWYG {
tree.Context.Tip.AppendChild(&ast.Node{Type: ast.NodeBr})
} else {
tree.Context.Tip.AppendChild(&ast.Node{Type: ast.NodeHardBreak, Tokens: []byte("\n")})
}
}
}
}
} else {
tree.Context.Tip.AppendChild(node)
}
} else {
node.Type = ast.NodeHTMLBlock
node.Tokens = util.DomHTML(n)
tree.Context.Tip.AppendChild(node)
}
return
case atom.Em, atom.I:
text := util.DomText(n)
if "" == strings.TrimSpace(text) {
break
}
if ast.NodeEmphasis == tree.Context.Tip.Type || tree.Context.Tip.ParentIs(ast.NodeEmphasis) {
break
}
if nil != tree.Context.Tip.LastChild && (ast.NodeStrong == tree.Context.Tip.LastChild.Type || ast.NodeEmphasis == tree.Context.Tip.LastChild.Type) {
// 在两个相邻的加粗或者斜体之间插入零宽空格，避免标记符重复
tree.Context.Tip.AppendChild(&ast.Node{Type: ast.NodeText, Tokens: util.StrToBytes(editor.Zwsp)})
}
if !lute.ParseOptions.InlineAsterisk || !lute.ParseOptions.InlineUnderscore {
node.Type = ast.NodeHTMLTag
node.AppendChild(&ast.Node{Type: ast.NodeHTMLTagOpen, Tokens: util.StrToBytes("<em>")})
} else {
node.Type = ast.NodeEmphasis
node.AppendChild(&ast.Node{Type: ast.NodeEmA6kOpenMarker, Tokens: util.StrToBytes("*")})
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Strong, atom.B:
text := util.DomText(n)
if "" == strings.TrimSpace(text) {
break
}
if ast.NodeStrong == tree.Context.Tip.Type || tree.Context.Tip.ParentIs(ast.NodeStrong) {
break
}
if nil != tree.Context.Tip.LastChild && (ast.NodeStrong == tree.Context.Tip.LastChild.Type || ast.NodeEmphasis == tree.Context.Tip.LastChild.Type) {
tree.Context.Tip.AppendChild(&ast.Node{Type: ast.NodeText, Tokens: util.StrToBytes(editor.Zwsp)})
}
if !lute.ParseOptions.InlineAsterisk || !lute.ParseOptions.InlineUnderscore {
node.Type = ast.NodeHTMLTag
node.AppendChild(&ast.Node{Type: ast.NodeHTMLTagOpen, Tokens: util.StrToBytes("<strong>")})
} else {
node.Type = ast.NodeStrong
node.AppendChild(&ast.Node{Type: ast.NodeStrongA6kOpenMarker, Tokens: util.StrToBytes("**")})
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Code:
if nil == n.FirstChild {
return
}
if nil != tree.Context.Tip.LastChild && ast.NodeCodeSpan == tree.Context.Tip.LastChild.Type {
tree.Context.Tip.AppendChild(&ast.Node{Type: ast.NodeText, Tokens: util.StrToBytes(editor.Zwsp)})
}
code := util.DomHTML(n)
if bytes.Contains(code, []byte(">")) {
code = code[bytes.Index(code, []byte(">"))+1:]
}
code = bytes.TrimSuffix(code, []byte("</code>"))
allSpan := true
for c := n.FirstChild; nil != c; c = c.NextSibling {
if html.TextNode == c.Type {
continue
}
if atom.Em == c.DataAtom || atom.Strong == c.DataAtom {
// https://github.com/siyuan-note/siyuan/issues/11682
continue
}
if atom.Span != c.DataAtom {
allSpan = false
break
}
}
if allSpan {
// 如果全部都是 span 子节点，那么直接使用 span 的内容 https://github.com/siyuan-note/siyuan/issues/11281
code = []byte(util.DomText(n))
code = bytes.ReplaceAll(code, []byte("\u00A0"), []byte(" "))
}
content := &ast.Node{Type: ast.NodeCodeSpanContent, Tokens: code}
node.Type = ast.NodeCodeSpan
if bytes.Contains(code, []byte("```")) {
node.CodeMarkerLen = 2
} else if bytes.Contains(code, []byte("``")) {
node.CodeMarkerLen = 1
} else if bytes.Contains(code, []byte("`")) {
node.CodeMarkerLen = 2
}
node.AppendChild(&ast.Node{Type: ast.NodeCodeSpanOpenMarker, Tokens: []byte("`")})
if bytes.Contains(code, []byte("``")) {
content.Tokens = append([]byte(" "), content.Tokens...)
}
node.AppendChild(content)
if bytes.Contains(code, []byte("``")) {
content.Tokens = append(content.Tokens, ' ')
}
node.AppendChild(&ast.Node{Type: ast.NodeCodeSpanCloseMarker, Tokens: []byte("`")})
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
return
case atom.Br:
if ast.NodeLink == tree.Context.Tip.Type || ast.NodeHeading == tree.Context.Tip.Type {
break
}
if nil == n.NextSibling {
break
}
if tree.Context.ParseOption.ProtyleWYSIWYG && lute.parentIs(n, atom.Table) {
node.Type = ast.NodeBr
} else {
node.Type = ast.NodeHardBreak
node.Tokens = util.StrToBytes("\n")
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.A:
node.Type = ast.NodeLink
text := strings.TrimSpace(util.DomText(n))
if "" == text && nil != n.Parent && lute.parentIs(n, atom.H1, atom.H2, atom.H3, atom.H4, atom.H5, atom.H6, atom.Div, atom.Section) && nil == util.DomChildrenByType(n, atom.Img) {
// 丢弃标题中文本为空的链接，这样的链接是没有锚文本的锚点
// https://github.com/Vanessa219/vditor/issues/359
// https://github.com/siyuan-note/siyuan/issues/11445
return
}
if "" == text && nil == n.FirstChild {
// 剪藏时过滤空的超链接 https://github.com/siyuan-note/siyuan/issues/5686
return
}
if nil != n.FirstChild && atom.Img == n.FirstChild.DataAtom && strings.Contains(util.DomAttrValue(n.FirstChild, "src"), "wikimedia.org") {
// Wikipedia 链接嵌套图片的情况只保留图片
break
}
node.AppendChild(&ast.Node{Type: ast.NodeOpenBracket})
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Img:
imgClass := util.DomAttrValue(n, "class")
imgAlt := util.DomAttrValue(n, "alt")
if "emoji" == imgClass {
if e := parse.EmojiUnicodeAlias[imgAlt]; "" != e {
// 直接使用 alt 值（即 emoji 字符）https://github.com/siyuan-note/siyuan/issues/13342
node.Type = ast.NodeText
node.Tokens = []byte(imgAlt)
} else {
node.Type = ast.NodeEmoji
emojiImg := &ast.Node{Type: ast.NodeEmojiImg, Tokens: tree.EmojiImgTokens(imgAlt, util.DomAttrValue(n, "src"))}
emojiImg.AppendChild(&ast.Node{Type: ast.NodeEmojiAlias, Tokens: util.StrToBytes(":" + imgAlt + ":")})
node.AppendChild(emojiImg)
}
} else {
node.Type = ast.NodeImage
node.AppendChild(&ast.Node{Type: ast.NodeBang})
node.AppendChild(&ast.Node{Type: ast.NodeOpenBracket})
if "" != imgAlt {
imgAlt = strings.TrimSpace(imgAlt)
imgAlt = strings.ReplaceAll(imgAlt, "动图封面", "动图")
node.AppendChild(&ast.Node{Type: ast.NodeLinkText, Tokens: util.StrToBytes(imgAlt)})
}
node.AppendChild(&ast.Node{Type: ast.NodeCloseBracket})
node.AppendChild(&ast.Node{Type: ast.NodeOpenParen})
src := util.DomAttrValue(n, "src")
if strings.Contains(class, "ztext-gif") && strings.Contains(src, "zhimg.com") {
// 处理知乎动图
src = strings.Replace(src, ".jpg", ".webp", 1)
}
if strings.HasPrefix(src, "data:image") {
// 处理可能存在的预加载情况
if dataSrc := util.DomAttrValue(n, "data-src"); "" != dataSrc {
src = dataSrc
}
}
// 处理使用 data-original 属性的情况 https://github.com/siyuan-note/siyuan/issues/11826
dataOriginal := util.DomAttrValue(n, "data-original")
if "" != dataOriginal {
if "" == src || !strings.HasSuffix(src, ".gif") {
src = dataOriginal
}
}
if "" == src {
// 处理使用 srcset 属性的情况
if srcset := util.DomAttrValue(n, "srcset"); "" != srcset {
if strings.Contains(srcset, ",") {
src = strings.Split(srcset, ",")[len(strings.Split(srcset, ","))-1]
src = strings.TrimSpace(src)
if strings.Contains(src, " ") {
src = strings.TrimSpace(strings.Split(src, " ")[0])
}
} else {
src = strings.TrimSpace(src)
if strings.Contains(src, " ") {
src = strings.TrimSpace(strings.Split(srcset, " ")[0])
}
}
}
}
// Wikipedia 使用图片原图 https://github.com/siyuan-note/siyuan/issues/11640
if strings.Contains(src, "wikipedia/commons/thumb/") {
ext := path.Ext(src)
if strings.Contains(src, ".svg.png") {
ext = ".svg"
}
if idx := strings.Index(src, ext+"/"); 0 < idx {
src = src[:idx+len(ext)]
src = strings.ReplaceAll(src, "/commons/thumb/", "/commons/")
}
}
node.AppendChild(&ast.Node{Type: ast.NodeLinkDest, Tokens: util.StrToBytes(src)})
var linkTitle string
var figcaption *html.Node
for next := n.NextSibling; nil != next; next = next.NextSibling {
if html.TextNode == next.Type && "" == strings.TrimSpace(next.Data) {
continue
}
if atom.Figcaption == next.DataAtom {
figcaption = next
break
}
}
if nil != figcaption {
linkTitle = util.DomText(figcaption)
figcaption.Unlink()
}
if "" == linkTitle {
linkTitle = util.DomAttrValue(n, "title")
}
linkTitle = strings.TrimSpace(linkTitle)
if "" != linkTitle {
node.AppendChild(&ast.Node{Type: ast.NodeLinkSpace})
node.AppendChild(&ast.Node{Type: ast.NodeLinkTitle, Tokens: []byte(linkTitle)})
}
node.AppendChild(&ast.Node{Type: ast.NodeCloseParen})
}
if ast.NodeDocument == tree.Context.Tip.Type {
p := &ast.Node{Type: ast.NodeParagraph}
tree.Context.Tip.AppendChild(p)
tree.Context.Tip = p
defer tree.Context.ParentTip()
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Input:
node.Type = ast.NodeTaskListItemMarker
node.TaskListItemChecked = lute.hasAttr(n, "checked")
tree.Context.Tip.AppendChild(node)
if nil != node.Parent.Parent {
if nil == node.Parent.Parent.ListData {
node.Parent.Parent.ListData = &ast.ListData{Typ: 3}
} else {
node.Parent.Parent.ListData.Typ = 3
}
}
case atom.Del, atom.S, atom.Strike:
if !lute.ParseOptions.GFMStrikethrough {
node.Type = ast.NodeHTMLTag
node.AppendChild(&ast.Node{Type: ast.NodeHTMLTagOpen, Tokens: util.StrToBytes("<s>")})
} else {
node.Type = ast.NodeStrikethrough
node.AppendChild(&ast.Node{Type: ast.NodeStrikethrough2OpenMarker, Tokens: util.StrToBytes("~~")})
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.U:
node.Type = ast.NodeHTMLTag
node.AppendChild(&ast.Node{Type: ast.NodeHTMLTagOpen, Tokens: util.StrToBytes("<u>")})
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Mark:
if !lute.ParseOptions.Mark {
node.Type = ast.NodeHTMLTag
node.AppendChild(&ast.Node{Type: ast.NodeHTMLTagOpen, Tokens: util.StrToBytes("<mark>")})
} else {
node.Type = ast.NodeMark
node.AppendChild(&ast.Node{Type: ast.NodeMark2OpenMarker, Tokens: util.StrToBytes("==")})
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Sup:
if !lute.ParseOptions.Sup {
node.Type = ast.NodeHTMLTag
node.AppendChild(&ast.Node{Type: ast.NodeHTMLTagOpen, Tokens: util.StrToBytes("<sup>")})
} else {
node.Type = ast.NodeSup
node.AppendChild(&ast.Node{Type: ast.NodeSupOpenMarker})
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Sub:
if !lute.ParseOptions.Sub {
node.Type = ast.NodeHTMLTag
node.AppendChild(&ast.Node{Type: ast.NodeHTMLTagOpen, Tokens: util.StrToBytes("<sub>")})
} else {
node.Type = ast.NodeSub
node.AppendChild(&ast.Node{Type: ast.NodeSubOpenMarker})
}
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Table:
node.Type = ast.NodeTable
var tableAligns []int
if nil != n.FirstChild && nil != n.FirstChild.FirstChild && nil != n.FirstChild.FirstChild.FirstChild {
for th := n.FirstChild.FirstChild.FirstChild; nil != th; th = th.NextSibling {
align := util.DomAttrValue(th, "align")
switch align {
case "left":
tableAligns = append(tableAligns, 1)
case "center":
tableAligns = append(tableAligns, 2)
case "right":
tableAligns = append(tableAligns, 3)
default:
tableAligns = append(tableAligns, 0)
}
}
}
node.TableAligns = tableAligns
tree.Context.Tip.AppendChild(node)
tree.Context.Tip = node
defer tree.Context.ParentTip()
case atom.Thead:
if nil == n.FirstChild {
break
}
tbodys := util.DomChildrenByType(n.Parent, atom.Tbody)
if 0 < len(tbodys) {
tbody := tbodys[0]
// 找到最多的 td 数
var tdCount int
for tr := tbody.FirstChild; nil != tr; tr = tr.NextSibling {
if atom.Tr != tr.DataAtom {
continue
}
var count int
for td := tr.FirstChild; nil != td; td = td.NextSibling {
if atom.Td == td.DataAtom {
count++
}
}
if count > tdCount {
tdCount = count
}
}
// 补全 thead 中 tr 的 th
for tr := n.FirstChild; nil != tr; tr = tr.NextSibling {
if atom.Tr != tr.DataAtom {
continue
}
var count int
for td := tr.FirstChild; nil != td; td = td.NextSibling {
if atom.Th == td.DataAtom {
count++
}
}
if count < tdCount {
for i := count; i < tdCount; i++ {
th := &html.Node{Data: "th", DataAtom: atom.Th, Type: html.ElementNode}
tr.AppendChild(th)