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highlight: Add tabindex when code is not highlighted

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This commit is contained in:
Helder Pereira 2021-08-22 15:03:20 +01:00 committed by Bjørn Erik Pedersen
parent 2f0945bafe
commit 7a15edafe2
3 changed files with 53 additions and 44 deletions
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75
markup/goldmark/convert.go
View file

@ -310,49 +310,52 @@ func newHighlighting(cfg highlight.Config) goldmark.Extender {
),
hl.WithWrapperRenderer(func(w util.BufWriter, ctx hl.CodeBlockContext, entering bool) {
l, hasLang := ctx.Language()
var language string
if hasLang {
if l, hasLang := ctx.Language(); hasLang {
language = string(l)
}
if entering {
if !ctx.Highlighted() {
w.WriteString(`<pre>`)
highlight.WriteCodeTag(w, language)
return
}
w.WriteString(`<div class="highlight`)
var attributes []ast.Attribute
if ctx.Attributes() != nil {
attributes = ctx.Attributes().All()
}
if attributes != nil {
class, found := ctx.Attributes().GetString("class")
if found {
w.WriteString(" ")
w.Write(util.EscapeHTML(class.([]byte)))
}
_, _ = w.WriteString("\"")
renderAttributes(w, true, attributes...)
if ctx.Highlighted() {
if entering {
writeDivStart(w, ctx)
} else {
_, _ = w.WriteString("\"")
writeDivEnd(w)
}
} else {
if entering {
highlight.WritePreStart(w, language, "")
} else {
highlight.WritePreEnd(w)
}
w.WriteString(">")
return
}
if !ctx.Highlighted() {
w.WriteString(`</code></pre>`)
return
}
w.WriteString("</div>")
}),
)
}
func writeDivStart(w util.BufWriter, ctx hl.CodeBlockContext) {
w.WriteString(`<div class="highlight`)
var attributes []ast.Attribute
if ctx.Attributes() != nil {
attributes = ctx.Attributes().All()
}
if attributes != nil {
class, found := ctx.Attributes().GetString("class")
if found {
w.WriteString(" ")
w.Write(util.EscapeHTML(class.([]byte)))
}
_, _ = w.WriteString("\"")
renderAttributes(w, true, attributes...)
} else {
_, _ = w.WriteString("\"")
}
w.WriteString(">")
}
func writeDivEnd(w util.BufWriter) {
w.WriteString("</div>")
}

6
markup/goldmark/convert_test.go
View file

@ -155,7 +155,7 @@ description
// Code fences
c.Assert(got, qt.Contains, "<div class=\"highlight\"><pre tabindex=\"0\" class=\"chroma\"><code class=\"language-bash\" data-lang=\"bash\">LINE1\n</code></pre></div>")
c.Assert(got, qt.Contains, "Code Fences No Lexer</h2>\n<pre><code class=\"language-moo\" data-lang=\"moo\">LINE1\n</code></pre>")
c.Assert(got, qt.Contains, "Code Fences No Lexer</h2>\n<pre tabindex=\"0\"><code class=\"language-moo\" data-lang=\"moo\">LINE1\n</code></pre>")
// Extensions
c.Assert(got, qt.Contains, `Autolink: <a href="https://gohugo.io/">https://gohugo.io/</a>`)
@ -392,7 +392,7 @@ LINE5
c.Assert(result, qt.Equals, `<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="nb">echo</span> <span class="s2">&#34;Hugo Rocks!&#34;</span>
</code></pre></div>`)
result = convertForConfig(c, cfg, `echo "Hugo Rocks!"`, "unknown")
c.Assert(result, qt.Equals, "<pre><code class=\"language-unknown\" data-lang=\"unknown\">echo &quot;Hugo Rocks!&quot;\n</code></pre>")
c.Assert(result, qt.Equals, "<pre tabindex=\"0\"><code class=\"language-unknown\" data-lang=\"unknown\">echo &quot;Hugo Rocks!&quot;\n</code></pre>")
})
c.Run("Highlight lines, default config", func(c *qt.C) {
@ -443,7 +443,7 @@ LINE5
cfg.LineNumbersInTable = false
result := convertForConfig(c, cfg, lines, "")
c.Assert(result, qt.Contains, "<pre><code>LINE1\n")
c.Assert(result, qt.Contains, "<pre tabindex=\"0\"><code>LINE1\n")
})
c.Run("No language, guess syntax", func(c *qt.C) {

16
markup/highlight/highlight.go
View file

@ -122,17 +122,17 @@ type preWrapper struct {
}
func (p preWrapper) Start(code bool, styleAttr string) string {
w := &strings.Builder{}
fmt.Fprintf(w, `<pre tabindex="0"%s>`, styleAttr)
var language string
if code {
language = p.language
}
WriteCodeTag(w, language)
w := &strings.Builder{}
WritePreStart(w, language, styleAttr)
return w.String()
}
func WriteCodeTag(w io.Writer, language string) {
func WritePreStart(w io.Writer, language, styleAttr string) {
fmt.Fprintf(w, `<pre tabindex="0"%s>`, styleAttr)
fmt.Fprint(w, "<code")
if language != "" {
fmt.Fprint(w, ` class="language-`+language+`"`)
@ -141,6 +141,12 @@ func WriteCodeTag(w io.Writer, language string) {
fmt.Fprint(w, ">")
}
const preEnd = "</code></pre>"
func (p preWrapper) End(code bool) string {
return "</code></pre>"
return preEnd
}
func WritePreEnd(w io.Writer) {
fmt.Fprint(w, preEnd)
}