mirror of
https://codeberg.org/forgejo/forgejo
synced 2024-08-22 23:51:36 +02:00
Change all license headers to comply with REUSE specification. Fix #16132 Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github> Co-authored-by: John Olheiser <john.olheiser@gmail.com>
499 lines
13 KiB
Go
499 lines
13 KiB
Go
// Copyright 2019 Yusuke Inuzuka
|
|
// Copyright 2019 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
// Most of what follows is a subtly changed version of github.com/yuin/goldmark/extension/footnote.go
|
|
|
|
package common
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"strconv"
|
|
"unicode"
|
|
|
|
"github.com/yuin/goldmark"
|
|
"github.com/yuin/goldmark/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"
|
|
)
|
|
|
|
// CleanValue will clean a value to make it safe to be an id
|
|
// This function is quite different from the original goldmark function
|
|
// and more closely matches the output from the shurcooL sanitizer
|
|
// In particular Unicode letters and numbers are a lot more than a-zA-Z0-9...
|
|
func CleanValue(value []byte) []byte {
|
|
value = bytes.TrimSpace(value)
|
|
rs := bytes.Runes(value)
|
|
result := make([]rune, 0, len(rs))
|
|
needsDash := false
|
|
for _, r := range rs {
|
|
switch {
|
|
case unicode.IsLetter(r) || unicode.IsNumber(r) || r == '_':
|
|
if needsDash && len(result) > 0 {
|
|
result = append(result, '-')
|
|
}
|
|
needsDash = false
|
|
result = append(result, unicode.ToLower(r))
|
|
default:
|
|
needsDash = true
|
|
}
|
|
}
|
|
return []byte(string(result))
|
|
}
|
|
|
|
// Most of what follows is a subtly changed version of github.com/yuin/goldmark/extension/footnote.go
|
|
|
|
// A FootnoteLink struct represents a link to a footnote of Markdown
|
|
// (PHP Markdown Extra) text.
|
|
type FootnoteLink struct {
|
|
ast.BaseInline
|
|
Index int
|
|
Name []byte
|
|
}
|
|
|
|
// Dump implements Node.Dump.
|
|
func (n *FootnoteLink) Dump(source []byte, level int) {
|
|
m := map[string]string{}
|
|
m["Index"] = fmt.Sprintf("%v", n.Index)
|
|
m["Name"] = fmt.Sprintf("%v", n.Name)
|
|
ast.DumpHelper(n, source, level, m, nil)
|
|
}
|
|
|
|
// KindFootnoteLink is a NodeKind of the FootnoteLink node.
|
|
var KindFootnoteLink = ast.NewNodeKind("GiteaFootnoteLink")
|
|
|
|
// Kind implements Node.Kind.
|
|
func (n *FootnoteLink) Kind() ast.NodeKind {
|
|
return KindFootnoteLink
|
|
}
|
|
|
|
// NewFootnoteLink returns a new FootnoteLink node.
|
|
func NewFootnoteLink(index int, name []byte) *FootnoteLink {
|
|
return &FootnoteLink{
|
|
Index: index,
|
|
Name: name,
|
|
}
|
|
}
|
|
|
|
// A FootnoteBackLink struct represents a link to a footnote of Markdown
|
|
// (PHP Markdown Extra) text.
|
|
type FootnoteBackLink struct {
|
|
ast.BaseInline
|
|
Index int
|
|
Name []byte
|
|
}
|
|
|
|
// Dump implements Node.Dump.
|
|
func (n *FootnoteBackLink) Dump(source []byte, level int) {
|
|
m := map[string]string{}
|
|
m["Index"] = fmt.Sprintf("%v", n.Index)
|
|
m["Name"] = fmt.Sprintf("%v", n.Name)
|
|
ast.DumpHelper(n, source, level, m, nil)
|
|
}
|
|
|
|
// KindFootnoteBackLink is a NodeKind of the FootnoteBackLink node.
|
|
var KindFootnoteBackLink = ast.NewNodeKind("GiteaFootnoteBackLink")
|
|
|
|
// Kind implements Node.Kind.
|
|
func (n *FootnoteBackLink) Kind() ast.NodeKind {
|
|
return KindFootnoteBackLink
|
|
}
|
|
|
|
// NewFootnoteBackLink returns a new FootnoteBackLink node.
|
|
func NewFootnoteBackLink(index int, name []byte) *FootnoteBackLink {
|
|
return &FootnoteBackLink{
|
|
Index: index,
|
|
Name: name,
|
|
}
|
|
}
|
|
|
|
// A Footnote struct represents a footnote of Markdown
|
|
// (PHP Markdown Extra) text.
|
|
type Footnote struct {
|
|
ast.BaseBlock
|
|
Ref []byte
|
|
Index int
|
|
Name []byte
|
|
}
|
|
|
|
// Dump implements Node.Dump.
|
|
func (n *Footnote) Dump(source []byte, level int) {
|
|
m := map[string]string{}
|
|
m["Index"] = strconv.Itoa(n.Index)
|
|
m["Ref"] = string(n.Ref)
|
|
m["Name"] = string(n.Name)
|
|
ast.DumpHelper(n, source, level, m, nil)
|
|
}
|
|
|
|
// KindFootnote is a NodeKind of the Footnote node.
|
|
var KindFootnote = ast.NewNodeKind("GiteaFootnote")
|
|
|
|
// Kind implements Node.Kind.
|
|
func (n *Footnote) Kind() ast.NodeKind {
|
|
return KindFootnote
|
|
}
|
|
|
|
// NewFootnote returns a new Footnote node.
|
|
func NewFootnote(ref []byte) *Footnote {
|
|
return &Footnote{
|
|
Ref: ref,
|
|
Index: -1,
|
|
Name: ref,
|
|
}
|
|
}
|
|
|
|
// A FootnoteList struct represents footnotes of Markdown
|
|
// (PHP Markdown Extra) text.
|
|
type FootnoteList struct {
|
|
ast.BaseBlock
|
|
Count int
|
|
}
|
|
|
|
// Dump implements Node.Dump.
|
|
func (n *FootnoteList) Dump(source []byte, level int) {
|
|
m := map[string]string{}
|
|
m["Count"] = fmt.Sprintf("%v", n.Count)
|
|
ast.DumpHelper(n, source, level, m, nil)
|
|
}
|
|
|
|
// KindFootnoteList is a NodeKind of the FootnoteList node.
|
|
var KindFootnoteList = ast.NewNodeKind("GiteaFootnoteList")
|
|
|
|
// Kind implements Node.Kind.
|
|
func (n *FootnoteList) Kind() ast.NodeKind {
|
|
return KindFootnoteList
|
|
}
|
|
|
|
// NewFootnoteList returns a new FootnoteList node.
|
|
func NewFootnoteList() *FootnoteList {
|
|
return &FootnoteList{
|
|
Count: 0,
|
|
}
|
|
}
|
|
|
|
var footnoteListKey = parser.NewContextKey()
|
|
|
|
type footnoteBlockParser struct{}
|
|
|
|
var defaultFootnoteBlockParser = &footnoteBlockParser{}
|
|
|
|
// NewFootnoteBlockParser returns a new parser.BlockParser that can parse
|
|
// footnotes of the Markdown(PHP Markdown Extra) text.
|
|
func NewFootnoteBlockParser() parser.BlockParser {
|
|
return defaultFootnoteBlockParser
|
|
}
|
|
|
|
func (b *footnoteBlockParser) Trigger() []byte {
|
|
return []byte{'['}
|
|
}
|
|
|
|
func (b *footnoteBlockParser) Open(parent ast.Node, reader text.Reader, pc parser.Context) (ast.Node, parser.State) {
|
|
line, segment := reader.PeekLine()
|
|
pos := pc.BlockOffset()
|
|
if pos < 0 || line[pos] != '[' {
|
|
return nil, parser.NoChildren
|
|
}
|
|
pos++
|
|
if pos > len(line)-1 || line[pos] != '^' {
|
|
return nil, parser.NoChildren
|
|
}
|
|
open := pos + 1
|
|
closure := util.FindClosure(line[pos+1:], '[', ']', false, false) //nolint
|
|
closes := pos + 1 + closure
|
|
next := closes + 1
|
|
if closure > -1 {
|
|
if next >= len(line) || line[next] != ':' {
|
|
return nil, parser.NoChildren
|
|
}
|
|
} else {
|
|
return nil, parser.NoChildren
|
|
}
|
|
padding := segment.Padding
|
|
label := reader.Value(text.NewSegment(segment.Start+open-padding, segment.Start+closes-padding))
|
|
if util.IsBlank(label) {
|
|
return nil, parser.NoChildren
|
|
}
|
|
item := NewFootnote(label)
|
|
|
|
pos = next + 1 - padding
|
|
if pos >= len(line) {
|
|
reader.Advance(pos)
|
|
return item, parser.NoChildren
|
|
}
|
|
reader.AdvanceAndSetPadding(pos, padding)
|
|
return item, parser.HasChildren
|
|
}
|
|
|
|
func (b *footnoteBlockParser) Continue(node ast.Node, reader text.Reader, pc parser.Context) parser.State {
|
|
line, _ := reader.PeekLine()
|
|
if util.IsBlank(line) {
|
|
return parser.Continue | parser.HasChildren
|
|
}
|
|
childpos, padding := util.IndentPosition(line, reader.LineOffset(), 4)
|
|
if childpos < 0 {
|
|
return parser.Close
|
|
}
|
|
reader.AdvanceAndSetPadding(childpos, padding)
|
|
return parser.Continue | parser.HasChildren
|
|
}
|
|
|
|
func (b *footnoteBlockParser) Close(node ast.Node, reader text.Reader, pc parser.Context) {
|
|
var list *FootnoteList
|
|
if tlist := pc.Get(footnoteListKey); tlist != nil {
|
|
list = tlist.(*FootnoteList)
|
|
} else {
|
|
list = NewFootnoteList()
|
|
pc.Set(footnoteListKey, list)
|
|
node.Parent().InsertBefore(node.Parent(), node, list)
|
|
}
|
|
node.Parent().RemoveChild(node.Parent(), node)
|
|
list.AppendChild(list, node)
|
|
}
|
|
|
|
func (b *footnoteBlockParser) CanInterruptParagraph() bool {
|
|
return true
|
|
}
|
|
|
|
func (b *footnoteBlockParser) CanAcceptIndentedLine() bool {
|
|
return false
|
|
}
|
|
|
|
type footnoteParser struct{}
|
|
|
|
var defaultFootnoteParser = &footnoteParser{}
|
|
|
|
// NewFootnoteParser returns a new parser.InlineParser that can parse
|
|
// footnote links of the Markdown(PHP Markdown Extra) text.
|
|
func NewFootnoteParser() parser.InlineParser {
|
|
return defaultFootnoteParser
|
|
}
|
|
|
|
func (s *footnoteParser) Trigger() []byte {
|
|
// footnote syntax probably conflict with the image syntax.
|
|
// So we need trigger this parser with '!'.
|
|
return []byte{'!', '['}
|
|
}
|
|
|
|
func (s *footnoteParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
|
|
line, segment := block.PeekLine()
|
|
pos := 1
|
|
if len(line) > 0 && line[0] == '!' {
|
|
pos++
|
|
}
|
|
if pos >= len(line) || line[pos] != '^' {
|
|
return nil
|
|
}
|
|
pos++
|
|
if pos >= len(line) {
|
|
return nil
|
|
}
|
|
open := pos
|
|
closure := util.FindClosure(line[pos:], '[', ']', false, false) //nolint
|
|
if closure < 0 {
|
|
return nil
|
|
}
|
|
closes := pos + closure
|
|
value := block.Value(text.NewSegment(segment.Start+open, segment.Start+closes))
|
|
block.Advance(closes + 1)
|
|
|
|
var list *FootnoteList
|
|
if tlist := pc.Get(footnoteListKey); tlist != nil {
|
|
list = tlist.(*FootnoteList)
|
|
}
|
|
if list == nil {
|
|
return nil
|
|
}
|
|
index := 0
|
|
name := []byte{}
|
|
for def := list.FirstChild(); def != nil; def = def.NextSibling() {
|
|
d := def.(*Footnote)
|
|
if bytes.Equal(d.Ref, value) {
|
|
if d.Index < 0 {
|
|
list.Count++
|
|
d.Index = list.Count
|
|
val := CleanValue(d.Name)
|
|
if len(val) == 0 {
|
|
val = []byte(strconv.Itoa(d.Index))
|
|
}
|
|
d.Name = pc.IDs().Generate(val, KindFootnote)
|
|
}
|
|
index = d.Index
|
|
name = d.Name
|
|
break
|
|
}
|
|
}
|
|
if index == 0 {
|
|
return nil
|
|
}
|
|
|
|
return NewFootnoteLink(index, name)
|
|
}
|
|
|
|
type footnoteASTTransformer struct{}
|
|
|
|
var defaultFootnoteASTTransformer = &footnoteASTTransformer{}
|
|
|
|
// NewFootnoteASTTransformer returns a new parser.ASTTransformer that
|
|
// insert a footnote list to the last of the document.
|
|
func NewFootnoteASTTransformer() parser.ASTTransformer {
|
|
return defaultFootnoteASTTransformer
|
|
}
|
|
|
|
func (a *footnoteASTTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
|
|
var list *FootnoteList
|
|
if tlist := pc.Get(footnoteListKey); tlist != nil {
|
|
list = tlist.(*FootnoteList)
|
|
} else {
|
|
return
|
|
}
|
|
pc.Set(footnoteListKey, nil)
|
|
for footnote := list.FirstChild(); footnote != nil; {
|
|
container := footnote
|
|
next := footnote.NextSibling()
|
|
if fc := container.LastChild(); fc != nil && ast.IsParagraph(fc) {
|
|
container = fc
|
|
}
|
|
footnoteNode := footnote.(*Footnote)
|
|
index := footnoteNode.Index
|
|
name := footnoteNode.Name
|
|
if index < 0 {
|
|
list.RemoveChild(list, footnote)
|
|
} else {
|
|
container.AppendChild(container, NewFootnoteBackLink(index, name))
|
|
}
|
|
footnote = next
|
|
}
|
|
list.SortChildren(func(n1, n2 ast.Node) int {
|
|
if n1.(*Footnote).Index < n2.(*Footnote).Index {
|
|
return -1
|
|
}
|
|
return 1
|
|
})
|
|
if list.Count <= 0 {
|
|
list.Parent().RemoveChild(list.Parent(), list)
|
|
return
|
|
}
|
|
|
|
node.AppendChild(node, list)
|
|
}
|
|
|
|
// FootnoteHTMLRenderer is a renderer.NodeRenderer implementation that
|
|
// renders FootnoteLink nodes.
|
|
type FootnoteHTMLRenderer struct {
|
|
html.Config
|
|
}
|
|
|
|
// NewFootnoteHTMLRenderer returns a new FootnoteHTMLRenderer.
|
|
func NewFootnoteHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
|
|
r := &FootnoteHTMLRenderer{
|
|
Config: html.NewConfig(),
|
|
}
|
|
for _, opt := range opts {
|
|
opt.SetHTMLOption(&r.Config)
|
|
}
|
|
return r
|
|
}
|
|
|
|
// RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.
|
|
func (r *FootnoteHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
|
|
reg.Register(KindFootnoteLink, r.renderFootnoteLink)
|
|
reg.Register(KindFootnoteBackLink, r.renderFootnoteBackLink)
|
|
reg.Register(KindFootnote, r.renderFootnote)
|
|
reg.Register(KindFootnoteList, r.renderFootnoteList)
|
|
}
|
|
|
|
func (r *FootnoteHTMLRenderer) renderFootnoteLink(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
|
|
if entering {
|
|
n := node.(*FootnoteLink)
|
|
is := strconv.Itoa(n.Index)
|
|
_, _ = w.WriteString(`<sup id="fnref:`)
|
|
_, _ = w.Write(n.Name)
|
|
_, _ = w.WriteString(`"><a href="#fn:`)
|
|
_, _ = w.Write(n.Name)
|
|
_, _ = w.WriteString(`" class="footnote-ref" role="doc-noteref">`)
|
|
_, _ = w.WriteString(is)
|
|
_, _ = w.WriteString(`</a></sup>`)
|
|
}
|
|
return ast.WalkContinue, nil
|
|
}
|
|
|
|
func (r *FootnoteHTMLRenderer) renderFootnoteBackLink(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
|
|
if entering {
|
|
n := node.(*FootnoteBackLink)
|
|
_, _ = w.WriteString(` <a href="#fnref:`)
|
|
_, _ = w.Write(n.Name)
|
|
_, _ = w.WriteString(`" class="footnote-backref" role="doc-backlink">`)
|
|
_, _ = w.WriteString("↩︎")
|
|
_, _ = w.WriteString(`</a>`)
|
|
}
|
|
return ast.WalkContinue, nil
|
|
}
|
|
|
|
func (r *FootnoteHTMLRenderer) renderFootnote(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
|
|
n := node.(*Footnote)
|
|
if entering {
|
|
_, _ = w.WriteString(`<li id="fn:`)
|
|
_, _ = w.Write(n.Name)
|
|
_, _ = w.WriteString(`" role="doc-endnote"`)
|
|
if node.Attributes() != nil {
|
|
html.RenderAttributes(w, node, html.ListItemAttributeFilter)
|
|
}
|
|
_, _ = w.WriteString(">\n")
|
|
} else {
|
|
_, _ = w.WriteString("</li>\n")
|
|
}
|
|
return ast.WalkContinue, nil
|
|
}
|
|
|
|
func (r *FootnoteHTMLRenderer) renderFootnoteList(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
|
|
tag := "div"
|
|
if entering {
|
|
_, _ = w.WriteString("<")
|
|
_, _ = w.WriteString(tag)
|
|
_, _ = w.WriteString(` class="footnotes" role="doc-endnotes"`)
|
|
if node.Attributes() != nil {
|
|
html.RenderAttributes(w, node, html.GlobalAttributeFilter)
|
|
}
|
|
_ = w.WriteByte('>')
|
|
if r.Config.XHTML {
|
|
_, _ = w.WriteString("\n<hr />\n")
|
|
} else {
|
|
_, _ = w.WriteString("\n<hr>\n")
|
|
}
|
|
_, _ = w.WriteString("<ol>\n")
|
|
} else {
|
|
_, _ = w.WriteString("</ol>\n")
|
|
_, _ = w.WriteString("</")
|
|
_, _ = w.WriteString(tag)
|
|
_, _ = w.WriteString(">\n")
|
|
}
|
|
return ast.WalkContinue, nil
|
|
}
|
|
|
|
type footnoteExtension struct{}
|
|
|
|
// FootnoteExtension represents the Gitea Footnote
|
|
var FootnoteExtension = &footnoteExtension{}
|
|
|
|
// Extend extends the markdown converter with the Gitea Footnote parser
|
|
func (e *footnoteExtension) Extend(m goldmark.Markdown) {
|
|
m.Parser().AddOptions(
|
|
parser.WithBlockParsers(
|
|
util.Prioritized(NewFootnoteBlockParser(), 999),
|
|
),
|
|
parser.WithInlineParsers(
|
|
util.Prioritized(NewFootnoteParser(), 101),
|
|
),
|
|
parser.WithASTTransformers(
|
|
util.Prioritized(NewFootnoteASTTransformer(), 999),
|
|
),
|
|
)
|
|
m.Renderer().AddOptions(renderer.WithNodeRenderers(
|
|
util.Prioritized(NewFootnoteHTMLRenderer(), 500),
|
|
))
|
|
}
|