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Use user input as part of footnote identifier

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Named footnotes (`[^foo]` instead of `[^42]`) use the name in HTML
node identifiers. This allows for stable references. Cool URLs don't
change.

Fixes #92
This commit is contained in:
Tommi Virtanen 2020-01-15 18:47:28 -07:00
parent 70ad9d5b30
commit b72024d2b0
2 changed files with 46 additions and 8 deletions
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18
extension/_test/footnote.txt
View file

@ -66,3 +66,21 @@ test![^1]
</ol>
</section>
//= = = = = = = = = = = = = = = = = = = = = = = =//
6
//- - - - - - - - -//
That's some text with a footnote.[^mynameisjeff]
[^mynameisjeff]: And that's the footnote.
//- - - - - - - - -//
<p>That's some text with a footnote.<sup id="fnref:mynameisjeff"><a href="#fn:mynameisjeff" class="footnote-ref" role="doc-noteref">1</a></sup></p>
<section class="footnotes" role="doc-endnotes">
<hr>
<ol>
<li id="fn:mynameisjeff" role="doc-endnote">
<p>And that's the footnote. <a href="#fnref:mynameisjeff" class="footnote-backref" role="doc-backlink">&#x21a9;&#xfe0e;</a></p>
</li>
</ol>
</section>
//= = = = = = = = = = = = = = = = = = = = = = = =//

36
extension/footnote.go
View file

@ -242,16 +242,36 @@ func (r *FootnoteHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegist
reg.Register(ast.KindFootnoteList, r.renderFootnoteList)
}
func isNumeric(b []byte) bool {
for _, c := range b {
if c < '0' || c > '9' {
return false
}
}
return true
}
// footnoteRef decides what to use to refer to the footnote. The
// returned string is safe to use in HTML attributes.
func footnoteRef(index int, ref []byte) []byte {
if !isNumeric(ref) {
return util.EscapeHTML(ref)
}
return strconv.AppendInt(nil, int64(index), 10)
}
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)
ref := footnoteRef(n.Index, n.Ref)
_, _ = w.WriteString(`<sup id="fnref:`)
_, _ = w.WriteString(is)
_, _ = w.Write(ref)
_, _ = w.WriteString(`"><a href="#fn:`)
_, _ = w.WriteString(is)
_, _ = w.Write(ref)
_, _ = w.WriteString(`" class="footnote-ref" role="doc-noteref">`)
_, _ = w.WriteString(is)
// the content itself refers to footnotes by number, even when
// they are named
_, _ = w.WriteString(strconv.Itoa(n.Index))
_, _ = w.WriteString(`</a></sup>`)
}
return gast.WalkContinue, nil
@ -260,9 +280,9 @@ func (r *FootnoteHTMLRenderer) renderFootnoteLink(w util.BufWriter, source []byt
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)
ref := footnoteRef(n.Index, n.Ref)
_, _ = w.WriteString(` <a href="#fnref:`)
_, _ = w.WriteString(is)
_, _ = w.Write(ref)
_, _ = w.WriteString(`" class="footnote-backref" role="doc-backlink">`)
_, _ = w.WriteString("&#x21a9;&#xfe0e;")
_, _ = w.WriteString(`</a>`)
@ -272,10 +292,10 @@ func (r *FootnoteHTMLRenderer) renderFootnoteBackLink(w util.BufWriter, source [
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 {
ref := footnoteRef(n.Index, n.Ref)
_, _ = w.WriteString(`<li id="fn:`)
_, _ = w.WriteString(is)
_, _ = w.Write(ref)
_, _ = w.WriteString(`" role="doc-endnote"`)
if node.Attributes() != nil {
html.RenderAttributes(w, node, html.ListItemAttributeFilter)