Avoid repeated language- in info string.

See commonmark/commonmark.js#277.
commonmark · Jan 22, 2024 · c1af25c · c1af25c
1 parent 0d77ca1
commit c1af25c
Show file tree

Hide file tree

Showing 2 changed files with 19 additions and 1 deletion.
diff --git a/src/html.c b/src/html.c
@@ -160,7 +160,10 @@ static int S_render_node(cmark_node *node, cmark_event_type ev_type,
 
       cmark_strbuf_puts(html, "<pre");
       S_render_sourcepos(node, html, options);
-      cmark_strbuf_puts(html, "><code class=\"language-");
+      cmark_strbuf_puts(html, "><code class=\"");
+      if (strncmp((char *)node->as.code.info, "language-", 9) != 0) {
+        cmark_strbuf_puts(html, "language-");
+      }
       escape_html(html, node->as.code.info, first_tag);
       cmark_strbuf_puts(html, "\">");
     }

diff --git a/test/regression.txt b/test/regression.txt
@@ -241,3 +241,18 @@ _*xx-_-
 <p><em>*xx-</em>-</p>
 ````````````````````````````````
 
+commonmark.js #277:
+```````````````````````````````` example
+```language-r
+x <- 1
+```
+
+```r
+x <- 1
+```
+.
+<pre><code class="language-r">x &lt;- 1
+</code></pre>
+<pre><code class="language-r">x &lt;- 1
+</code></pre>
+````````````````````````````````