cpp extend clike

[straicat]

Fix: prism-cpp load failed.

If cpp extend c, it will fallback to default language.

[straicat]

const md = require('markdown-it')();
const prism = require('markdown-it-prism');
md.use(prism);
const markdown = "```cpp\n" +
                "class Demo { };\n"+
                "```";
const ret = md.render(markdown);
console.log(ret);

markdown-it-prism will use prism as backend to render codeblocks. However, if cpp extend c, it will fail to load prism-cpp.js, and it render the markdown text as follow:

<pre class="language-cpp"><code class="language-cpp">class Demo { };
</code></pre>

While if cpp extend clike, it is:

<pre class="language-cpp"><code class="language-cpp"><span class="token keyword">class</span> <span class="token class-name">Demo</span> <span class="token punctuation">{</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre>

Maybe there is some mistakes in it.

[RunDevelopment]

This issue is caused by markdown-it-prism, not PrismJS. See the issue here.