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// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markdown
import (
"fmt"
"regexp"
"strings"
"sync"
"code.gitea.io/gitea/modules/container"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/markup/internal"
"code.gitea.io/gitea/modules/setting"
"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"
)
// ASTTransformer is a default transformer of the goldmark tree.
type ASTTransformer struct {
renderInternal *internal.RenderInternal
attentionTypes container.Set[string]
}
func NewASTTransformer(renderInternal *internal.RenderInternal) *ASTTransformer {
return &ASTTransformer{
renderInternal: renderInternal,
attentionTypes: container.SetOf("note", "tip", "important", "warning", "caution"),
}
}
func (g *ASTTransformer) applyElementDir(n ast.Node) {
if !markup.RenderBehaviorForTesting.DisableAdditionalAttributes {
n.SetAttributeString("dir", "auto")
}
}
// Transform transforms the given AST tree.
func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
firstChild := node.FirstChild()
tocMode := ""
ctx := pc.Get(renderContextKey).(*markup.RenderContext)
rc := pc.Get(renderConfigKey).(*RenderConfig)
tocList := make([]Header, 0, 20)
if rc.yamlNode != nil {
metaNode := rc.toMetaNode()
if metaNode != nil {
node.InsertBefore(node, firstChild, metaNode)
}
tocMode = rc.TOC
}
_ = 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:
g.transformHeading(ctx, v, reader, &tocList)
case *ast.Paragraph:
g.applyElementDir(v)
case *ast.Image:
g.transformImage(ctx, v)
case *ast.Link:
g.transformLink(ctx, v)
case *ast.List:
g.transformList(ctx, v, rc)
case *ast.Text:
if v.SoftLineBreak() && !v.HardLineBreak() {
// TODO: this was a quite unclear part, old code: `if metas["mode"] != "document" { use comment link break setting }`
// many places render non-comment contents with no mode=document, then these contents also use comment's hard line break setting
// especially in many tests.
markdownLineBreakStyle := ctx.RenderOptions.Metas["markdownLineBreakStyle"]
if markdownLineBreakStyle == "comment" {
v.SetHardLineBreak(setting.Markdown.EnableHardLineBreakInComments)
} else if markdownLineBreakStyle == "document" {
v.SetHardLineBreak(setting.Markdown.EnableHardLineBreakInDocuments)
}
}
case *ast.CodeSpan:
g.transformCodeSpan(ctx, v, reader)
case *ast.Blockquote:
return g.transformBlockquote(v, reader)
}
return ast.WalkContinue, nil
})
showTocInMain := tocMode == "true" /* old behavior, in main view */ || tocMode == "main"
showTocInSidebar := !showTocInMain && tocMode != "false" // not hidden, not main, then show it in sidebar
if len(tocList) > 0 && (showTocInMain || showTocInSidebar) {
if showTocInMain {
tocNode := createTOCNode(tocList, rc.Lang, nil)
node.InsertBefore(node, firstChild, tocNode)
} else {
tocNode := createTOCNode(tocList, rc.Lang, map[string]string{"open": "open"})
ctx.SidebarTocNode = tocNode
}
}
if len(rc.Lang) > 0 {
node.SetAttributeString("lang", []byte(rc.Lang))
}
}
// it is copied from old code, which is quite doubtful whether it is correct
var reValidIconName = sync.OnceValue[*regexp.Regexp](func() *regexp.Regexp {
return regexp.MustCompile(`^[-\w]+$`) // old: regexp.MustCompile("^[a-z ]+$")
})
// NewHTMLRenderer creates a HTMLRenderer to render in the gitea form.
func NewHTMLRenderer(renderInternal *internal.RenderInternal, opts ...html.Option) renderer.NodeRenderer {
r := &HTMLRenderer{
renderInternal: renderInternal,
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
renderInternal *internal.RenderInternal
}
// 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(ast.KindCodeSpan, r.renderCodeSpan)
reg.Register(KindAttention, r.renderAttention)
reg.Register(KindTaskCheckBoxListItem, r.renderTaskCheckBoxListItem)
reg.Register(east.KindTaskCheckBox, r.renderTaskCheckBox)
}
func (r *HTMLRenderer) renderDocument(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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 {
if _, err = w.WriteString("<details"); err != nil {
return ast.WalkStop, err
}
html.RenderAttributes(w, node, nil)
_, err = w.WriteString(">")
} 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
}
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 !reValidIconName().MatchString(name) {
// skip this
return ast.WalkContinue, nil
}
// FIXME: the "icon xxx" is from Fomantic UI, it's really questionable whether it still works correctly
err := r.renderInternal.FormatWithSafeAttrs(w, `<i class="icon %s"></i>`, name)
if err != nil {
return ast.WalkStop, err
}
return ast.WalkContinue, nil
}
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