Updates the code shortcode to work with xml/html

[kylegundersen]

Hey buddy I was unable to use xml/html in shortcode it would break the page and render the HTML instead of showing the code. I basically check to see if its lang = XML and then I filter the HTML entities and replace the auto added WordPress tags. We can discuss or modify the functionality.

[owent]

@kylegundersen I think you should use &lt;p&gt; instead of <p> if you want show html or xml inner a HTML DOM.
Other labels are all the same.

You can visit the bottom of https://highlightjs.org/static/demo/ to see the source of <pre><code class="xml"> for example.

[kylegundersen]

That doesn't prevent the auto paragraph and break tags that get generated in the_content natively by WordPress (tinyMce). Also I made it so developers could just copy and paste their code in without having to escape the html/xml content manually.

[owent]

@kylegundersen I try to press enter in my wordpress blog. But all <br /> are converted to \n after I publish my post. And if I write <p> label in souce, It also be fixed to the right content. but how can tinyMce generate a <p> label?

[kylegundersen]

WordPress is the one that adds them. https://stackoverflow.com/questions/6625458/removing-p-and-br-tags-in-wordpress-posts

[owent]

@kylegundersen These tags should only be added after </pre> . I don't think it's a problem. Could you show me a sample please?

[kylegundersen]

You are right it won't add them if the content's characters are escaped, but my addition makes it so you don't have to escape the html/xml. Which is just easier in my opinion.

[owent]

I think it's better to provide a option instead of just replacing these two tags.