mirror of
https://github.com/go-gitea/gitea
synced 2024-11-16 15:14:24 +00:00
337 lines
9.0 KiB
Go
337 lines
9.0 KiB
Go
|
package extension
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"github.com/yuin/goldmark"
|
||
|
|
gast "github.com/yuin/goldmark/ast"
|
||
|
|
"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"
|
||
|
|
"strconv"
|
||
|
|
)
|
||
|
|
|
||
|
|
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 gast.Node, reader text.Reader, pc parser.Context) (gast.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
|
||
|
|
closes := 0
|
||
|
|
closure := util.FindClosure(line[pos+1:], '[', ']', false, false)
|
||
|
|
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 := ast.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 gast.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 gast.Node, reader text.Reader, pc parser.Context) {
|
||
|
|
var list *ast.FootnoteList
|
||
|
|
if tlist := pc.Get(footnoteListKey); tlist != nil {
|
||
|
|
list = tlist.(*ast.FootnoteList)
|
||
|
|
} else {
|
||
|
|
list = ast.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 gast.Node, block text.Reader, pc parser.Context) gast.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)
|
||
|
|
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 *ast.FootnoteList
|
||
|
|
if tlist := pc.Get(footnoteListKey); tlist != nil {
|
||
|
|
list = tlist.(*ast.FootnoteList)
|
||
|
|
}
|
||
|
|
if list == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
index := 0
|
||
|
|
for def := list.FirstChild(); def != nil; def = def.NextSibling() {
|
||
|
|
d := def.(*ast.Footnote)
|
||
|
|
if bytes.Equal(d.Ref, value) {
|
||
|
|
if d.Index < 0 {
|
||
|
|
list.Count += 1
|
||
|
|
d.Index = list.Count
|
||
|
|
}
|
||
|
|
index = d.Index
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if index == 0 {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
return ast.NewFootnoteLink(index)
|
||
|
|
}
|
||
|
|
|
||
|
|
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 *gast.Document, reader text.Reader, pc parser.Context) {
|
||
|
|
var list *ast.FootnoteList
|
||
|
|
if tlist := pc.Get(footnoteListKey); tlist != nil {
|
||
|
|
list = tlist.(*ast.FootnoteList)
|
||
|
|
} else {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
pc.Set(footnoteListKey, nil)
|
||
|
|
for footnote := list.FirstChild(); footnote != nil; {
|
||
|
|
var container gast.Node = footnote
|
||
|
|
next := footnote.NextSibling()
|
||
|
|
if fc := container.LastChild(); fc != nil && gast.IsParagraph(fc) {
|
||
|
|
container = fc
|
||
|
|
}
|
||
|
|
index := footnote.(*ast.Footnote).Index
|
||
|
|
if index < 0 {
|
||
|
|
list.RemoveChild(list, footnote)
|
||
|
|
} else {
|
||
|
|
container.AppendChild(container, ast.NewFootnoteBackLink(index))
|
||
|
|
}
|
||
|
|
footnote = next
|
||
|
|
}
|
||
|
|
list.SortChildren(func(n1, n2 gast.Node) int {
|
||
|
|
if n1.(*ast.Footnote).Index < n2.(*ast.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(ast.KindFootnoteLink, r.renderFootnoteLink)
|
||
|
|
reg.Register(ast.KindFootnoteBackLink, r.renderFootnoteBackLink)
|
||
|
|
reg.Register(ast.KindFootnote, r.renderFootnote)
|
||
|
|
reg.Register(ast.KindFootnoteList, r.renderFootnoteList)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *FootnoteHTMLRenderer) renderFootnoteLink(w util.BufWriter, source []byte, node gast.Node, entering bool) (gast.WalkStatus, error) {
|
||
|
|
if entering {
|
||
|
|
n := node.(*ast.FootnoteLink)
|
||
|
|
is := strconv.Itoa(n.Index)
|
||
|
|
_, _ = w.WriteString(`<sup id="fnref:`)
|
||
|
|
_, _ = w.WriteString(is)
|
||
|
|
_, _ = w.WriteString(`"><a href="#fn:`)
|
||
|
|
_, _ = w.WriteString(is)
|
||
|
|
_, _ = w.WriteString(`" class="footnote-ref" role="doc-noteref">`)
|
||
|
|
_, _ = w.WriteString(is)
|
||
|
|
_, _ = w.WriteString(`</a></sup>`)
|
||
|
|
}
|
||
|
|
return gast.WalkContinue, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *FootnoteHTMLRenderer) renderFootnoteBackLink(w util.BufWriter, source []byte, node gast.Node, entering bool) (gast.WalkStatus, error) {
|
||
|
|
if entering {
|
||
|
|
n := node.(*ast.FootnoteBackLink)
|
||
|
|
is := strconv.Itoa(n.Index)
|
||
|
|
_, _ = w.WriteString(` <a href="#fnref:`)
|
||
|
|
_, _ = w.WriteString(is)
|
||
|
|
_, _ = w.WriteString(`" class="footnote-backref" role="doc-backlink">`)
|
||
|
|
_, _ = w.WriteString("↩︎")
|
||
|
|
_, _ = w.WriteString(`</a>`)
|
||
|
|
}
|
||
|
|
return gast.WalkContinue, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *FootnoteHTMLRenderer) renderFootnote(w util.BufWriter, source []byte, node gast.Node, entering bool) (gast.WalkStatus, error) {
|
||
|
|
n := node.(*ast.Footnote)
|
||
|
|
is := strconv.Itoa(n.Index)
|
||
|
|
if entering {
|
||
|
|
_, _ = w.WriteString(`<li id="fn:`)
|
||
|
|
_, _ = w.WriteString(is)
|
||
|
|
_, _ = w.WriteString(`" role="doc-endnote"`)
|
||
|
|
if node.Attributes() != nil {
|
||
|
|
html.RenderAttributes(w, node, html.ListItemAttributeFilter)
|
||
|
|
}
|
||
|
|
_, _ = w.WriteString(">\n")
|
||
|
|
} else {
|
||
|
|
_, _ = w.WriteString("</li>\n")
|
||
|
|
}
|
||
|
|
return gast.WalkContinue, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *FootnoteHTMLRenderer) renderFootnoteList(w util.BufWriter, source []byte, node gast.Node, entering bool) (gast.WalkStatus, error) {
|
||
|
|
tag := "section"
|
||
|
|
if r.Config.XHTML {
|
||
|
|
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 gast.WalkContinue, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
type footnote struct {
|
||
|
|
}
|
||
|
|
|
||
|
|
// Footnote is an extension that allow you to use PHP Markdown Extra Footnotes.
|
||
|
|
var Footnote = &footnote{}
|
||
|
|
|
||
|
|
func (e *footnote) 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),
|
||
|
|
))
|
||
|
|
}
|